NASA TECHNICAL MEMORANDUM 

X-RAY SATELLITE (ROSAT) 

STATUS REPORT, 1ST QUARTER 1986 

493-7h 

NASA TM-88499 

DFVLR (German Aerospace Research Establishment) 

Translation of "Roentgen Satellit Statusbericht, 1. Quartal 1986", 

DFVLR (German Aerospace Research Establishement", May 5, 1986, pp. 1-60 

N 0 7- 1 526 1 (NASA-TH-88499) X-RAY SATELLITE (3OSAX) 

Status Report, 1st quarter 1SE6 (National 

Aeronautics and Sgace AdoitAstration) 43 p 

LSCL 22B Uuclas 

G3/18 4,0335 

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION 

WASHINGTON, DC 20546 AUGUST 1986 
STANDARD TITLE PAGE 

. Rcport No. ?. Co*e*nm.nt ~c~...;~~ N~.. 3. ~..;~..nt'. Co~olop HR,. 

:MA I'M-88499 

ELLl'lE (Rum) 5. re per^ Dot. . Title on2 Subtitle 

STATUS REPORT, 1ST QUARTER 1986 August 1986 

'. Pcrlo,ming O*cm;iot;on Nome cnd Add,cn~ 

le corporate Word', inc. 

LO2 Arrott Bldg. 

IO. Wovk Unit No. 

DFVLR (GERMAN AEROSPACE RESEARCH ESTABLISHMENT) 

11. Conteoc~ 0. Cicnt No. 

NASW- 4 0 06 

13. 7,p. of fi*port ond P.i;od Co-er.2 

itional Aeronautics and Space Administration 

ishington, DC 20546 

14. 5ponsciinf Ap-ncy Cod. 

Translation of "Roentgen Satellit Statusbericht , 

1. Quartal 1986", DFVLR (German Aerospace Research Establishment), 

5. Supplcmcntory Notcs 

May 5, 1986, pp. 1-60 

6. Abslrocl L 

With regard to technical per,formance, the project is running according 

to plan..:.An increase in total cost outlay was required. 

Dornier Systems schedule projects ROSAT launch readiness for April 27, 

1988. 

launch date has been received from.NASA. The thirteenth status review 

was conducted at the-prime contractor in March, 1986. Assembly of the FM 

mirror system has been interrupted due to irregularities in the 

are effected by understaffing. Postponements have been announced in the 

The new 

However; as a result of the Challenger accident, no binding 

- 

. gold damping; in addition, mission operation and simulator development 

. data transmission and. components acquisition subsystems. i 

~ 

17. Key Words (Scleclcd by Aulhor(s)) 

- 

18. Discribucion S~ot-mont 

Un 1 imi ted 
1 .o 

1.1 

1.2 

1.3 

2.0 

3.0 

3.1 

3.2 

4.0 

4.1 

4.2 

4.3 

4.4 

4.5 

4.6 

5.0 

5.1 

5.2 

6.0 

7.0 

7.1 

7.2 

7.3 

8.0 

9.0 

10.0 

11.0 

12.0 

13.0 

13.1 

13.2 

Overview and Outlook 

Status of Projects 

Outlook 

Overview of Problems 

System 

Mechanical Subsystems 

S truc ture/Mechanisms 

Thermal Budget 

Electric Subsystems 

Energy Supply 

Pyrotechnics 

Cab1 ing 

Data Processing 

Data Transmission 

Position Measurement/Posi tion Control 

Pay 1 oad 

X-Ray Telescope 

Wide-Angle Camera 

Assembly, Integration, and Test 

Ground Equipment 

Electric Ground Equipment 

Mechanical Ground Equipment 

Optical Ground Equipment 

Mission Safety 

Launch Vehicle Interface 

Mission Operat ion 

Schedule 

Administrative Report (Special Distribution L is t) 

Appendix 

Personne 1 I nven tory 

Key to Abbreviations 

-3 - 
STATUS REPORT 

1.1 Status of Proiectq 

With regard to technical performance, the project is running according to 

plan. The ROSAT-total cost to the end the project, status December 1984, 

required an increase in the total outlay in Title 893 20. The EMFT was 

informed of this in writing. The new DS-schedule projects ROSAT’s 

readiness to start for April 27, 1988. Because of the shuttle misfiring of 

January 28, 1986, there is, at this time, no binding starting date from 

NASA 

Project Plan: 

The project plan has not yet been presented to the DFVLR board because of 

reservations regarding the data processing concept during the mission. 

Test and lfltearatlon FM/QM/STM - Phase 

The execution of the STM systems tests corresponds to the present 

planning status with partially changed operating sequences. The solar 

simulation test and the EMC-test were successfully concluded. 

ion FM - Phm 

Continuation of current projects 

Revlews /3 

The 13th status review at the chief contractor was conducted in March. 

€!mkms 

The lack of a binding takeoff date from NASA. 

*Numbers in right margin indicate pagination in the foreign text. 

-4 - 
The following activities of the EM/QM/STM-phase will be carried out 

during the next quarter 

- dismantling of the STM 

- transposing of the subsystem components onto the wooden model 

- additional test for position control (Delta-IST AMCS) 

- orbit simulation test 

- suit case test at the GSOC 

-structure overhaul 

- Design Review No. 2 on May 14, 1986 

A conference in the GSOC is scheduled for the purpose of consolidating the 

cost planning of the GSOC. It is the objective of the project management 

to keep the cost planning based on the ROSAT-project plan and to postpone 

additional endeavors until financing is secured. 

The absence of a binding takeoff date from NASA necessitates the review 

of options for various marginal requirements with which the project 

operation must continue. 

The review is made in close cooperation with the NASA project /4 

management, the chief contractor, the project scientists, and the BMFT. 

It is the objective of the project management to decide on an option to 

which a definite takeoff date is attached. 

1.3 Overview of Problm /5 

Area Type of Prob 1 em 

1. Management - At present, no problems at the chief contractor 

2. System - Failure of high vacuum in the HRI-detector on the 

attached ion pump needs to be clarified and eliminated 

3. Mechanical - At present, no problems 

Subsys terns 

4. Electric - Exceeding the temperature limits on the solar 

Subsystems generator on the open loading bay in the Shuttle and 

during direct contact with the sun's radiation need to 

be prevented by altering Shuttle orientation in the PIP. 

-5 - 
5. Telescope 

6. Assembly 

7. Ground 

Equipment 

8. Mission 

Safety 

9. Launch 

Vehicle 

Interface 

10. Mission 

11. Schedule 

- Assembly of the FM-mirror system has been 

interrupted due to irregularities in the gold damping. 

- At present, no problems 

- At present, no problems 

- At present, no problems 

- Designation of a takeoff time by NASA is open /*/ 

- Mission operation and simulator development /6 

suffer from understaffing. 

- off -line data processing concept remains open. 

- Postponements have been announced in the subsystems 

data transmission and building parts acquisition. 

- Due to problems with the gold damping of the /**/ 

FM-mirror system, we must reckon with a 

postponement of milestone M7. Further consequences 

for the FM-schedule remain to be clarified. 

- The planning for allocations of the PANTER test /*/ 

site shows incompatibilities whose elimination can 

have consequences with regard to the schedule. 

(I*/ for Items 9 and 1 IC = that these problems have been added to the list; 

/**/for Item 1 lb =I that this problem has been resolved.) 

2.0- /7 

The examination of errors and contacts with NASA have shown tnat a 

return of ROSAT from orbit in the event of an error is possible if a few 

technical and safety-related prerequisites are met. These essentially 

include the retracting and the locking of the antenna mast and the closing 

and the locking of the telescope cover. For these requirements the 

contractor worked out proposals. During the technical discussions it 

-6 - 
became evident that it is more cost-efficient to separate the antenna 

mast prior to a return. The necessary modifications on the satellite were 

initiated by means of a "change request". 

During the reporting period, the EMC-tests "Conducted Emission" and 

"Radiated Emission" were conducted at system level. In preparation for 

this, the testing procedures were set up and fine-tuned. For the execution 

of the test in the DS sterile room, measuring equipment and a shielding 

umbrella were borrowed from the ESA and installed. The EMC test had, on 

the whole, a positive run which confirmed the given and applied EMCspecifications for the design of the system and for the components. 

An extensive first draft for the ROSAT operating manual was created. In 

order to carry on with the ground operating manual there is a continuous, 

ongoing agreement process especially with the ground operating system. 

In accordance with the presently valid base line, the following NASA 

interface documents were made available and passed on to NASA-JSC: 

PIP Annex 1, PIP Annex 2, PIP Annex 4, and PIP Annex 6. 

3.0- -SubSvstems /8 

3.1 Structut-e/MeMisrrlS 

The manufacture of FM parts in preparation for the refurbishment of the 

structure was continued. The structure is expected back at MBB upon 

dismantling of the satellite in April 1986. 

In the subsystem mechanisms, the completion and installation of the FMmechanisms was continued. Upon submission and examination of the test 

specifications for the TDM-FM (construction examination), TDM-hinge 

(thermal functioning test), and SSM-FM (overall examination), these could 

be released by TN4. 

The necessary modifications for an untrained EVA at the TDM and the ABM 

with the AN were laid down. The CR No. 10 will be changed accordingly and 

submitted to DS for the posting of a bid. 

In February, ROSAT was subjected to the solar simulation test at the IABG. 

The test could be carried out without major significant difficulties during 

-7 - 
the scheduled time span of 14 days. The test results agree largely with 

the test calculations. Wherever there are deviations, they can be 

explained. 

Upon conclusion of these tests there will be a safe thermal concept of 

ROSAT which shows no drawbacks anywhere. 

4.1 and 42 Fner-y, Pyro&hnic$ 

An additional status discussion was held on March 1 1 , 1986, at DS to 

review production status, FM-component schedule, and the processing 

status of documentat ion of both subsystems. 

In summary, it can be reported that 

- the hardware fabrication of the FM-electronic boxes and the 

FM-battery housings is on schedule and that the EEE-construction 

parts still owed have, at this time, no effect on the delivery dates 

for the integration. 

- the FM-solar generator fabrication was halted by DS until the 

results of the sample-test (re-qualif ication of the solar generator 

with respect to adhesion stability of the solar cells on a solar cell 

structure, based on wrapping technology) become available. This 

test should have been concluded at the end of February. (Deficient 

loose ends of the substrate adhesive prevented a test to-date). 

After the sample test, a decision about the continuation of the 

FM-fabrication of the solar generator will be made based on the 

results of the CDR ("Critical Design Review). 

- there are no open disturbances from the STM/EM-system test that 

have an effect on the FM-fabrication. 

- the time scheduling is being reworked. 

No problems are envisioned in the delivery of FM-components. 

- the specifications, aside from current applications for LIB 

modifications (additional TR-heater and HRI-heater) reflect an 

up-to-date status and that the EM-test procedures are now being 

reworked for the FM-components. 

-8 - 
An additional status discussion was held on March 1 1 , 1980 at OS to 

review the production status, the FM-cabling network schedule, and the 

processing status of the documentation. 

In summary, it can be reported that 

- all three FM-part cable networks (power/pyro-, signal and 

STS-heater) have been completed so that, from April 1986 on, 

acceptance tests for the whole cable network can commence. In 

the meantime, the test instructions for these test have been 

released by the PL. 

- the documentation for the FM-cable network such as specification, 

harness- 1 is t , is up- to-date. 

- there are, at this time, no technical or schedule problems with the 

delivery of the FM-cabling to System Integration. 

4.4 Data Procesw 

The EM of the data processing system, meaning DPS and tape recorder have, 

without any problems, survived the space simulation test which took place 

at the beginning of this reporting period. The DHS has thus been 

successfully tested for its flight fitness. At this time, some 

modifications at the DHS-EM and at the breadboard are being probed and 

optimized. These are the result of a few disturbances and three accepted 

change applications. The objective is to have the modifications, scheduled 

for the FM, ready in time for the planned EM-"orbit simulation test". 

The work on the FM continues uninterrupted and according to plan so that, 

in spite of a few still missing construction parts, the scheduled delivery 

date to the S/C does not appear to be in danger. The box is made and wired 

up, all base plates are there, partly with assemblies already mounted, and 

the first integration jobs have begun. 

4.5 Data Tramissim .. 

The subsystem data transmission is in an acceptable state of operations 

and assembly. The one existing lack of clarity dealing with the setting and 

determination of the degree of modulation for the telemetry data should be 

cleared up during the upcoming compatibility tests with thk GSOC, 

probably during the month of April. 

-9 - 
Transponder 

Both FM-instruments are qualified after tentative acceptance to the 

system. As soon as possible, however, they will be sent back to the 

manufacturer for refurbishment and for the elimination of a few 

apparent deficiencies. They will again be at the system's disposal 

around the beginning of July. 

Decoder 

The FM-assembly of the decoder is delayed because of missing 

construction parts. Nevertheless, plans do call for a July delivery. 

The assembly of the flight models continues without any problems. In 

accordance with the schedule, the delivery to the system is to be the 

end of June. 

4.6 POS15W .. .. 

- EM-Program 

The essential activities in the EM-program have reference to the 

availability and testing of position control software for the pointing 

mode. Preparations for carrying out the sub-system acceptance tests 

were continued. The test procedures for the static tests have been 

received. The procedures for the dynamic test have not yet arrived. 

The EM-components of the AMCS-system worked well in the tests at 

system level during the reporting period (solar simulation test and 

EMC- tes t 1. 

- FM-Program 

The assembly of the FM-components (star sensor, reaction wheels, 

gyroscope, AMCE, and AMCD) was carried through as much as possible, 

given the situation with the construction parts. During the last 

weeks, the assembly activity of electronic components came to a halt 

in any case, since the sheet bars could not be finished because of 

missing construction parts. 

If the construction parts come in at the beginning of the second 

quarter as announced, then the delivery date of December 1986 for the 

subsystem can be kept as planned. 

- 10 - 
The telescope-QM will be used within the framework of the 

system- AI T-t asks. 

The fabrication of the components for the flight mode\ of the telescope 

will be concluded in time in spite of the belated assembly start, so that 

the date for the assembly of the FM-telescope is not endangered. 

After the problems related to the gold coating for the flight mirrors at 

C. Zeiss have apparently been solved - the verification that the sources of 

contamination in the C. Zeiss-sterile room have been eliminated, has not 

yet been concluded - the new problem of insufficient gold damping was 

examined during this reporting period at the firm of Ealzers. 

The findings of the SIMS-analysis that hydrocarbons entered the gold 

coating during the damping process, was confirmed by the MPE via x - ray 

reflection measurements on sample mirrors. The influence of 

hydrocarbons on the reflectivity is so great that, on the one hand, these 

sample mirrors cannot be used for contamination control measurements 

and that, on the other hand, mirrors with such gold coatings violate the 

reflection specification for the ROSAT-telescope. 

It was, therefore, necessary to identify the cause of the deficiency and 

then take measures for correction. 

LA 

The likeliest cause is that there are hydrocarbons present in the damping 

apparatus which are liberated upon heating, free to enter the gold coating. 

A corrective measure was the improvement of the damping apparatus 

(additional cyrogenic pumping surfaces, changes in the vacuum system) 

and also a substantial increase in the degree of cleanliness before 

damping. The consequential technical measures lead to the conclusion that 

the assembly of the mirror system can begin only upon a verification of 

the effectiveness of these measures. This would be in May 1986, at the 

earliest. 

The status of projects in the contract (separate from those for the entire 

system) for the production of the lndjyidual flight modelrrors 

-11 - 
at C. Zeiss is as follows: 

All projects related to the flight mirrors have been successfully 

concluded. The adjustments were set back in order to position the mirrors 

more securely. 

The FI-EM continued to be successfully employed at the system tests. 

The assembly of the FI-FM was continued. Structure and mechanisms are 

mounted. The electronics assembly is pretty much complete, functionsand environmental tests continue at box level. 

Unresolved problems were further pursued: 

- HRI-Random Vibration Loads 

After agreement was reached over the HRI-random testloads, / 16 

GSFC/SAO took additional measures for the mechanical reinforcement 

of critical points at the HRI, so that the instrument can be tested 

with the agreed-upon realistic loads. This then solves the problem in 

a satisfactory manner. 

- FI-EM Delays 

During the reporting period, DS presented the restructured FM-AIT 

schedule with a date adjustment for the FI-EM in harmony with the 

MPE-schedule. This takes care of the problem. 

- Vacuum Test with the HRI-EM 

Measures taken to improve the reliability with which the vacuum in 

the HRI is maintained, have not yet been conclusively discussed with 

GSFUSAO. The discussions are to be held in conjunction with the 

projects for the care of the the HRI-ion supply pump during 

transportation and start preparation. 

A new problem has been added 

- The Availability of the PANTER-Testing Unit 

The x-ray test equipment of the MPE is used for the ROSAT-project in 

a variety of ways: 

- 12 - 
(a) for reflection and scatter measurements on flight mirrors and on 

sample mirrors 

(b) for Fi-tests 

(c) for mirror system tests 

(d) for telescope measurements and -calibration 

(e) for WFC-tests 

Past scheduling permitted a sequential passing of various jobs. 

Because of the delays in the assembly of the mirror system 

and the marked increase in the number of sample mirror 

measurements, several tests had to be run simultaneously in the 

PANTER-uni t so that the schedule could be maintained. An 

investigation is under way to see whether or not a tightening of tests 

and changes in the sequence can help avoid compromising the 

ROSAT-FM schedule. 

/ 17 

Wide Arlgle CafDera (WFU m 

- Activities during the reporting period 

Solar simulation test successfully concluded 

Routine interface discussions during the status meetings at the DS 

on January 22-23 and from March 1 1 - 13. 

Agreement on changed dates (FM: October 17, 1986) based on new 

AI T -schedu 1 e. 

- Outlook 

Preparations for "orbit simulation tests" in July 1986 

- Solar Simulation Test of the STM 

The test was run according to plan from January 16 to February 27 at 

the IABG in Ottobrunn. If transportation and substantial ground 

handling is to be inciuded, then the time neecied stretched from 

January 7 to March 5. 

Thanks to the careful preparation and the smooth team work with the 

iABG ana the experimenters, each particular test phase could be 

carried through without significant problems. 

- 13 - 
Calculated temperatures for the thermal model were substantially 

confirmed by measurements, or the surfaced differenc.es to the 

mathematical model could be explained. 

The experimental tests were also successfully carried out; the 

calculated temperatures could be verified. The system tests of the 

S/C under TV-condi t ions were a1 1 successful. 

Problems with the electric system test site could be traced to 

environmental conditions which were sometimes outside of the 

permissable limits. 

All interferences were documented in interference reports. The 

evaluation of test results and of interference reports will be given in 

July 1986, in a final test report. 

It became evident that for some instruments or functions, the 

acquisition of redundancies must be thought out so that during tests 

with the flight model all possible longer test intemptions can be 

avoided. 

- EMC-Test of the EM L2n 

Preparations for the EMC-test began immediately after the arrival of 

the S/C from the IABG to Domier. 

In order to save transportation time, an EMC test tent was erected 

inside the sterile room at DS. Thus tests with directed and radiated 

interferences could be carried out. 

The tests began on March 10, and they are still in progress. 

The results, available to the end of the quarter, show that the 

directed interferences were within permissable values. The radiated 

interferences, however, exceed these values in the power subsystem 

and in the focal plane instrumentation. Remedial measures have 

already been instituted; with the focal plane instrumentation they can 

only De implemented with the FM. 

- Outlook 

RF-suitcase test at the GSOC during the time of April 10 to 23. 

Dismantling of the SIC and refurbishment of structure at MBE. 

-14- 
7.1 FDF and Che-t Software 

The test sequences of the checkout-software for the solar simulation test 

at the IABG in Ottobrunn were reworked. The preparations and the running 

of the tests were supported with EGSE. During those tests there were 

several interferences and breakdowns of the EGSE-computer until the 

suspected cause of low humidity in the C/O-room was recognized and 

el imi nated. 

During the preparations for the solar simulations test at the IABG on 

February 5, 1986, the acceptance of the data interface (Ethernet) took 

place between the SIC-EGSE checkout computer (VAX 1 I /750) and the 

GSOC communications computer (MIRCO VAX I I). 

At DS, support was given to the preparations and the running of the 

EMC-tests with EGSE. 

7 3 Mecw Ground FThe hardware activities have been concluded. Support was given to the 

preparations for the ROSAT-solar simulation test and also at the 

switching of the S/C from the assembly base to the WSA-adapter in front 

of the test chamber of the IABG. 

7.3 ODml Ground FauW 

No projects. 

at1d 

The end of March 1986, project management received from 

NASA-GSFC the inspection results of the material list, Edition 4 

which was part of the data packet for the "Safety 11 Review. The 

checking of the commentaries was started. 

The analysis/inspection of the FMECAs was concluded. The result is 

summarized in the answer of project management to DR 1 -RIA No.25 

"System Re1 iabi 1 i ty". 

- 15 - 
litv Assuraor;e 

There was one additional and last inspection following final controls 

of double-sided PCB's at the firm of MBB. AI 1 the presented PCE's 

were released for continued use. 

The checking into interferences of level 2 was continued. 

Central Pur- of Co-ction Part5 

The delivery of the remaining construction parts to the users is in 

part delayed up to the 27th KW 86. Affected by this are a total of 38 

line items. The longest delay with the IC's are the RCA-blocks CMM 

5104 and 51 14 in HiRel-quality is up to the 20th KW 86, the six 

microprocessors , one RAM-, and one PROM-data bank of the US-f irm 

L23 

are in delay between the 17th and the 27th KW 86. The hybrid 

construction block 52 12 of the US-f irm Micronetworks for the AMCS 

and DPS is delayed until the 26th KW 86. All effort have been and 

will be made (working out purchasing alternatives) to reduce the 

delays in delivery for the remaining construction parts to those who 

need them. 

Harries for the star sensor electronic construction groups 

9JLLaunchVehiclelnterface L24 

- PIP-Annex 2, Part 2: 

(flight planning) 

- PIP-Annex 5: 

lnterf ace) 

(VOI I I, MCCIR-POCC 

- PIP-Annex 8: 

(Launch Site Support 

Plan - LSSP) 

On the basis of requests from DS, NASA-JSC 

has made a draft available which was sent 

to DS for inspection in Feb. '86. Results are 

not yet available. 

The "basel inen-version, agreed upon between 

NASA-JSC/-GSFC and GSOC is now available 

to the project managements for their final 

check and signature. 

The LSSP is available to the project 

management in its preliminary version (Feb. 

'86) and the included PRD, Vol If Annex BD in 

the version of Feb. 7, '86 signed by 

NASA-KSC. 

The results of the discussions with 

NASA-KSC of Oct. 1985 were incorporated 

- 16 - 
/ 

into these versions. Plans call for having a 

signed "basic version" of the LSSP available 

in the second half of 1986. 

10.0MissionDDeration L25 

The thorough analysis of all present demands on the mission operation 

system led to the definition of necessary increased effort and 

performance in the preparation and execution of the mission operation.The 

ROSAT-allocated cost portion in the DV-concept at WT-DV was also 

determined. On the basis of a new planning date in April 1988, a new 

full-cost calculation for the ROSAT-bottom segment was worked out and 

submitted to the appropriate DFVLR-agencies via the RF-RM-managemen t. 

eratiqn 

Upon thorough analysis of the ROSAT-command system requirements, the 

initial efforts begin for the layout of the command data bank. Preparatory 

tasks to command the ROSAT-suitcase model during the compatibility 

tests, were completed. 

By participating in the "solar simulation" test at the IABG, the GSOC was 

able to gather valuable experience. Preparations are underway for the 

scheduled "orbit simulation" test. DS delivered a "draft" of the "SIC Users 

Manual" which is still being revised. Also available is "Operations 

Instructions for the FI". Projects related to the "Mission Operations 

Support Plan" were again postponed. bee Problems). 

eratiqn Lzd 

An analysis on the possibility of including the Australian ground station 

(COSSA) in Alice Springs led to the conclusion not to give the use of this 

station further consideration. Successful tests were run involving the 

ground station in Weilheim for the reception of the 1MBPS-data stream 

from the IRAS satellite. Track prediction and -determination within the 

framework of tests with IRAS gave good results. This part of the ground 

station system for ROSAT has thus been successfully qualified. 

- 17 - 
.. IssJon PlAW 

The activities for the setting of detailed internal specifications as the 

foundation for the software design, were continued. A first draft was 

made for an operational system for the site operation. In the area of 

mission planning, the analysis for the requirements is concluded. Design 

changes for the "mission planning and scheduling system" (MPSS) resulting 

from this analysis led to the writing of a first specification. 

In preparation for the datasystem-compatibility test between the 

ROSAT-FM and the GSOC, a communication test between the GSOC-I/F 

computer and the EGSE-computer was successfully carried out. A concept 

for the better handling of "high rate"-data at the ground station in 

Weilheim is being shaped. The necessary measures for overcoming the 

DV-requirements, have been cleared up and the required costs have been 

determined. The ROSAT-allocated cost portion will be shown in the 

ROSAT-project plan. 

C Sirnuator L2z 

A1 1 essential processors of the simulator-EXECUTIVE-sof tware packet are 

coded and are tested in terms of modules, The RAL supportive software 

packet for the simulation of the satellite's outer field and of the sensors 

(DDS package) is completed with the exception of the star sensor and is 

ready at the GSOC for integration. The simulator AMCD-hardware with the 

supporting interface system was delivered by OS. The correct functioning 

of the individual components must still be checked. 

DS was authorized beforehand to develop the software on the interface 

sy s tem. 

Test & Tra1nm.g .. 

Test procedures for the execution of the ROSAT RF-compatibility tests in 

Weiiheim were specified and brought in tune with industry. Necessary 

preparations and instrument modifications were carried out for the 

execution of the tests at the ground station. 

A first draft for the ROSAT-telemetry processor was made. The FI and the 

WFC "data bases" were converted into GSOC (ROMP) compatible tables. A 

- 18 - 
design of the necessary conversion software was developed for the 

corresponding transposition of the DS-monitor tables. For this, an 

accurate analysis of the ESA Basic Checkout System was necessary. An 

"interface c.ontro1 document" (ICD)for the MDR-generation was set up in 

tentative form. 

The procurement of the necessary resources to cover the needed additional 

efforts for the ROSAT operation preparations and execution, is an unsolved 

problem. 

Another postponement of the AMPTE-mission operation until June 1986 

caused the continued shortage of 2 people (as of January 1986) to carry 

out the tasks in WP 200. 

Logistical communication problems between GSOC and industry impede the 

exchange of information. 

see Appendix 13.1 

Adjustment to a new takeoff date is needed. 

Until further notice, the old schedule is in force. (see the last quarterly 

report). 

-- 

The planned dates of the contract milestone plan having the takeoff 

date of October 30, 1987, are no longer in agreement with the actual 

status. The same holds for the NASA-schedule in the PIP with a 

takeoff date of September 30, 1987 (reference milestone "ready for 

launch". 

By reason of the shuttle misfire on January 28, '86, there is, at this 

time, no binding takeoff date from NASA. The actual status shows, 

therefore, that the ROSAT management is ready for takeoff 

independent of NASA assertions. 

- 19 - 
The presently valid schedule for the STM-integration dated February 

20, '86, compared to the previous schedule dated November 6, '85, 

shows the same end date of July 7,1986 for the conclusion of the 

structure overhaul. Additionally, the following tests were taken up: 

- test for the functioning of the subsystem position measurement/ 

- orbit simulation pretest 

- orbit simulation test 

position control in the integrated state (Delta IST AMCS) 

None of the additional tests interfere with the schedule for the 

structure overhaul, since the needed subsystems are integrated into a 

wooden structure. 

The presently valid DS-schedule for the FM-integration, dated 

February 24, '86, shows takeoff readiness for Apri 1 27, '88 with two 

buffer periods totalling 3.5 months. 

-20 - 
)1 Key to pages 22 and 23: 

A) Release, 8) Processing, C) Milestone Plan, D) EM, QM, STM, ENTW., 

Production, S/S-Tests, AIT, E) Project Directors, F) Level, G) Page 1 of 2, 

H) from:, I) Last Change, J) Due Date:, K) Milestones and Activities, 

L) Remarks: DRI Planning Status Planning Status Nov. 6,'85 Actual 

Status. - 1) Spacecraft Design, 3) Subsystem (SIS) Development, 

4) Production EM, QM, 7) EM Delivery MA, (M3) FI, WFC, 10) M4, ROSAT ready 

for Modal Surv. lest, 17) M6, Disassembling Spacecraft, 19) Structure 

Overhaul. 
ORlGlNRL PAGE R 

1 

cv 

2 

9 I1 

II 

01 

I 

+ * I 

* 

+ * 

+ 

I + + 

t 

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I 

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+ + + 

+ 

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1 

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+ 

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m 

+ 

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+ .. 

a 

W 

t 

+ 

Y 

W 

[L 

a 

Y 

0‘ 

+ 

1 * I 

+ I 

-1- I * 
Key to page 25: 

A) Remarks: Dri Planning Status Planning Status as of Nov. 12, '85 

Actual Status. - 1) Production FM, 3) M7, Delivery MA, 4) Delivery Fi, 

5) Delivery WFC, 6) AIT Telescope FM, 9) M8 ROSAT FM Ready for 

Environment Tests 1 1 ) Compatibility Test GSOC, 12) Telescope X-Ray 

Performance Test, t 5) Transport to KSC, 16) Launch Preparation. 
* 

f c 

1 

z 

0 

> 

c 

c 

c 

4 

m 

+ I 

I 

I 

i 

I 

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1 * 

1 =I= 

1 

+ 

fU 

J i w 

L 

n 

,i5 

E I 
t3.0- 

i 

1 3 3 Key to qhhrev- .. 

26 
Key to page 28: 

Personnel Inventory DFVLR-RF-TN4,B) (Man-Months), C) Status: March 3 1, 

1986, D) Period Ideal Actual (fepeat three tin7e5 across.), E) Category i 

Category I I Category I I I Total (feptwt three tjnm down,! 
P 

I 
Key to page 30: 

A) Personnel inventory DFVLR-RF-RM, 8) Mission Operations Cost Carriers 

2885007, C) Status: April 1 , 1986, D) Man-Months Period ideal Actual 

(repeat three tin7es acrusd, E) Category I Category I I Category I I I 

Total MJ), F) Independent Efforts, G) Budgeted for 1986: at a conversion 

factor 1 MJ=---, H) Project Plan-Ideal 1986, I) results in output:, J) 

Budget ideal, K) Project Plan, Ideal, L) Contract Status, Actual, M) 

Remarks: . Ideal corresponds to Project Plan Status of Feb. 14, '85, N) 

Budget corresponds to GSOC-Planning actually done, 0) Actual corresponds 

to work actually put out. 
i 

.. 
Key to page 32: 

A) Spent Sums siru;elan. 1 1985 Personnel Inventory DFVLR-RF-RM, 8) 

Missions Operations Cost Carrier 2885007, C) Status: April 1 , 1986, 

D) Nan-Months Period Ideal Actual, E) man-Years Period Ideal Actual 

F) Period Ideal Actual (repeat once xrms 4 H) Independent Efforts, 

I) Project Plan, J) Work Done. 
i 

I 

! 
Key to page 34: 

A) Personnel Inventory DFVLR-RF-RM, 6) Simulator Cost Carrier 3885406, 

C) Status April 1, 1 986, D) Man-Months Period Ideal Actual /fepeaf 

fhree fin7es acrussf , E) Category I Category I I Category I I I Total (W), 

F) Independent Efforts, G) Budgeted 1986, at a conversion factor 

H) results in output:, I) Planned, ideal, J) Contract Status, actual. 

33 
f 

i 
Key to pages 36-43: , 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

10. 

11. 

12. 

13. 

14. 

15. 

16. 

17. 

18. 

19. 

20. 

21. 

22. 

AA 

AKS 

AN 

BMFT 

CFK 

DF VLR 

DFVLR-PL 

DV 

lA0G 

INVAR 

KW 

m 

MPE 

MPG 

ROSA1 

SlMS 

SKE 

SKF 

TA 

TV 

WSA 

ZERODUR 

West German Secretary for Research and 

Application for Change 

Alignment Control System 

Contract Recipient 

Technology 

Carbon Fiber Reinforced Plastics 

West German Research and Testin{ 

Institute for Air- and Space Trave 

DFVLR Project Management 

Data Processing 

Industrial Sites - Company 

(Trade name for a special Steel A1 

Calender Week 

Mass Model 

OY 

Max-Planck Institute for Physics and 

Astrophysics, 

Institute for Extraterrestial Physics 

Max-Planck Association 

X-Ray Satellite 

Secondary Ion Mass Spectrometry 

Own Cost Rebate Price 

Own Cost Firm Price 

Technical Direction 

Thermal Vacuum 

Space Simulation Assembly 

(Trade name for the Glass-Ceramic material 

of the mirror). 

35 
13.2 Abkurzungsverzeichnis 

ABM Antenna Boom Mechanism 

ADP Acceptance Data Package 

XA Xnderungsantrag 

AKS Ausricht-Rontroll-System 

AIT Assembly, Integration and Test 

AMCD Attitude Measurenent and Control Data Unit 

AMCE Attitude Measurement and Control Interface 

AMCS 

AMPTE 

AN 

BAT 

BCU 

Bit, Sync. 

BMFT 

CCD 

CCL 

C&DH 

CEL 

CFK 

CFRP 

CITE 

Cmd 

CMOS 

c/o 

CPP 

CPU 

Electronics 

Attitude Measurement and Control Subsystem 

Active Magnetospheric Particle Tracer Explorer 

Auf tragnehmer 

Battery 

Battery Control Unit 

Bit Synchronizer (Synchronization) 

Bundesminister far Forschung und Technologie 

Charge Coupled Device 

Charge Current Limiter 

Command and Data Handling 

Control Electronics 

kohlefaserverstarkter Kunststoff 

Carbon Fiber Reinforced Plastics 

Cargo Integration Test Equipment 

Command 

Complementary Metaloxyde Silicon 

Checkout 

Central Parts Procurement 

Central Processing Unit 

DFVLR 

RF-TN4 

Status : 

31.03.1986 

36 
CR 

, CSA 

css 

cz 

DC 

DDS 

DEC 

@ DFVLR 

DFVLR-PL 

DHS 

DMA 

DMOD 

DNEL 

DPS 

DR 

DS 

Change Request, 

Charge Solar Array 

Coarse Sun Sensor 

Firma Carl Zeiss 

Direct Current 

EAC 

m 

EC S 

EED 

EEE 

EEL 

EGSE 

EM 

EMC 

EOL 

EORD 

I 

Dynamic Device Sirnuladons 

Decoder 

Deutsche Forschungs- und Versuchsanstalt fur 

Luft- und Raumfahrt 

DFVLR-Projektleitung 

Data Handling Subsystem 

Direct Memory Access (Direct Access to Memory) 

Demodulator 

Disconnection of Non-Essential Loads 

Data Processing System 

Design Review 

Dornier System 

Datenverarbei tung 

Estimate At Completion 

Engineering Change Request 

Environmental Control System 

Electro-Explosive Device 

Electric, Electronic, Electromechanical 

Experiment-Electronics 

Electrical Ground Support Equipment 

Engineering Model 

Electromagnetic Compatibility 

End-of-Life 

Experiment Operations Requirements Document 

Status : 

31.03.1986 DFVLR RoNT GENS AT ELLIT 

RF-TN4 
EPD 

ESA 

ETOL 

EW 

EVA 

FEM 

FI 

FLS 

FM 

FMECA 

FWHM 

GF 

GSE 

GSFC 

GSOC 

GVS 

GYP 

GYPE 

GYPS 

..” 

HC 

HEAO-2 

HIREL 

HK 

HP 

HRI 

External Power Dumper 

European Space Agency 

ESA Test Operation Language 

Extreme Ultraviolet 

Extravehicular Activity 

Finite Element Model 

Focal Plane Instrumentation 

Fiducial Light System 

Flight Mode 1 

Failure Mode Criticality Analysis 

Full Width at Half Maximum 

-. 

Grapple Fixture 

Ground Support Equipment 

Goddard Space Flight Center 

German Space Operations Center 

Gas Supply System 

Gyropackage 

Gyropackage Electronics 

Gyropackage Sensor 

, 

Heater Control 

High Energy Astronomy Observatory (“Einstein”) 

High Reliability 

Housekeeping 

High Power 

High Resolution Imager 

@ 1-G Industrieanlagen-Betriebsgesellschaft 

IC Integrated Circuit 

I 

RUNT GENS AT ELL IT 

Status: 

31 -03.1986 

38 
BLATl 56 

ICD 

IEEE 

INVAR 

IST 

JSC 

kbps 

KSC 

KW 

LCL 

LED 

LHC 

LI 

LP 

LSSP 

MA 

MAC 

Mbps 

MC 

MCC 

MCP 

MDM 

PA9R 

MED 

MES 

MGSE 

MIP 

Interface Control Document 

Institute of Electrical and Electronics 

Engineers 

(Handelsname fur eine besondere Stahllegierungl 

Integrated System Test 

Johnson Space Center 

Kilobit per second (deutsch: kbit/s) 

Kennedy Space Center 

Kalenderwoche 

Latching Current Limiter - 

Light Emitting Diode 

Left-hand Circulation 

Line Item 

Low Power 

Launch Site Support Plan 

Mirror Assembly 

Mirror Attachment Cone 

Megabit per second (deutsch: Megabitis) 

Magnetic Coil 

Mission Control Center 

Microchannel Plate 

Multiplexer/Demultiplexer 

Master Data Record 

Magnetic Electron Deflector 

Mechanisms Subsystem 

Mechanical Ground Support Equipment 

Mandatory Inspection Point 

I 

Status: 

31 -03.1986 

DFVLR RUNT GENS AT ELLIT 

RF-TN4 
Burr 57 

# DFVLR RF-TN4 

MLI 

R~NTGENSATELLIT 

@ MPG 

MPSS 

MRB 

MSA 

MSSL 

MUC 

, MUDAS 

MVL 

NASA 

NCR 

NRZ/L-Code 

KS I _. i 

OBC 

OGSE 

OIB 

OSR 

PCB 

PCU 

PDU 

PETS 

Mu1 tilayer Insulation 

Magnetometer 

Massenmodell 

Mission Operations Meeting 

Memorandum of Understanding 

Max-Planck-institut fur Physik und Astrophysik 

Institut fur Extraterrestrische Physik 

Max-Planck-Gesellschaft 

Mission Planning and Scheduling System 

Material Review Board 

Main Solar Array 

Mullard Space Science Laboratory 

Multi-Use Container 

Modular Universal Data Acquisition and 

Control System 

Main Voltage Limiter 

National Aeronautics and Space Administration 

Non Conformance Report 

Non-Return-to-Zero/L-Code 

NASA Standard Initiator 

Onboard Computer 

Optical Ground Support Equipment 

Orbiter Interface Box 

Optical Surface Reflector 

Printed Circuit Board 

Power Control Unit 

Power Distribution Unit 

Payload Environmental Transportation System 

status : 

31.03.1986 
PGE! 

PHP 

PIP 

POCC 

PPF 

PRD 

PRD 

PROM 

PSE 

PSK 

PSPC 

PSS 

PYB 

QM '. 

.RAL 

RAM 

RCA 

RE 

Fu? 

RfA 

RfW 

RMC 

RMS 

ROMP 

@ ROSAT 

RS 

RSGF 

RSS 

RT 

Payload Ground Handling Mechanism 

Paraboloid-Hyperboloid Pair 

Payload Integration Plan 

Payload Operations Control Center 

Payload Processing Facility 

Program Requirements Document 

Project Requirements Document 

Programmable Read Only Memory 

Payload Support Equipment 

Phase-shift Keying 

Position Sensitive Proportional Counter 

Power Supply Subsystem 

Pyrotechnics Electronic Box- 

.. Qualification Model 

Rutherford Appleton Laboratory 

Random Access Memory 

Radio Corporation of America 

Radiated Emission 

Radio Frequency 

Request for Action 

Request for Waiver 

Right-hand Circulation 

Remote Manipulator System 

Realthe/Offline Mission Processor 

Rantgensatellit 

Radiated Susceptibility 

Rigidized Sensing Grapple Fixture 

Rotating Service Structure 

Real Time 

# DFVLR RF-TN4 

RONTGENSATELLIT Status : 

31.03.1986 
BLATT 59 .., 

RW ' 

Rx 

SA0 

s/c 

SCOE 

SERC 

SEU 

SIMS 

SIRD 

SKE 

SKF 

S/L 

SMDR 

SOC 

scs 

SPF 

SPL Code 

SSM 

s SM 

ST 

STC 

STE 

STM 

STS 

SURS 

S/W 

TA 

TC 

T/C 

TCE 

Reaction Wheel 

Receiver 

Smithsonian Astrophysical Observatory 

Spacecraft 

Special Checkout Equipment 

Science h Engineering Research Council 

Single Event Upset 

Sekundsr-Ionen-Massen-Spektrometrie 

Support Interface RequireKents Document 

Selbstkosten Erstattungspreis 

Selbstkosten Festpreis 

Serial Load .. 

Special Master Data Record 

Science Operations Center 

Silicon on Sapphire 

Single Point Failure 

Split Phase Level Code 

.Single Surface Mirror 

Separation Switch Mechanism 

Star Tracker 

Star TLacker Camera 

Star Tracker Electronics 

Structural Thermal Model 

Space Transportation System 

Shuttle Umbilical Retraction System 

Software 

Techni sche Anweisung 

Telecommand 

Thermal Control 

Thermal Conditioning Equipment 

I 

OFVLR 

RF-TN4 

Status: 

31 -03.1986 
t 

DFVLR 

RF-TN4 

TCS 

TDM 

TM 

TR 

TT & C 

TV 

'ZX 

Status : 

31.03.1986 

RUNTGENS ATELLIT 

UK 

us 

VPHD 

VPF 

WDE 

WFC 

WFCC 

WSA 

XRT 

ZERODUR 

ZDE 

.. .. 

Telecommunication Subsystem 

Telescope Door Mechanism 

Telemetry 

Tape Recorder 

Telemetry, Tracking and Command 

Thermal-Vakuum 

Transmitter 

United Kingdom 

Subsys tem 

Vertical Payload Handling Device 

Vertical Processing Facility 

Wheel Drive Electronics 

Wide Field Camera 

WFC-Cons or t i un 

Weltraumsimulationsanlage 

X-Ray Telescope 

(Handelsname fur den Glas-Keramik-Werkstoff 

des Spiegels) 

Central Data Electronics 

43 
.- 

x- LLl.ll2 1 

. iASx-?c8 8 4 99 

4. Title onC Sublitl. 

STATUS REPORT ZAiTER ism 

.. 

3. fi.',p..nt'. Co*olcp KG 

5. R.PCII Dol. 

August 1986 

6. P.,leiminp 0~vonirel;on Cod. 

4 

-13. 

C. Pe,lorm;nt 0iSws;aot;on Nome ond Alde-ss 

The Corporate Word, inc. 

1102 Arrott Bldq. 

Pittsburqh. PA 15222 

12. 'Sponsoring Agency Nome ond Addsoss 

National Aeronautics and Space Administration 

Vashinqton, DC 20546 

6. Abstroct 

%,+htechical T4 .. performance, the project is running according 

to plan..: An increase in total cost outlay was required. 

Dornier Systems schedule projects ROSAT launch readiness for April 27, 

1988. However; as a result of the Challenger accident, no binding 

launch date has been received from.NASA. The thirteenth status review 

was conducted at the-prime contractor in March, 1986. Assembly of the M 

mirror system has been interrupted due to irregularities in the 

are effected by understaffing. Postponements have been announced in the 

A 

The new 

- 

. gold damping; in addition, mission operation and simulator development . data transmission and components acquisition subsystems. -- 

Cont,.c( 0. Gl0r.t No. 

NASW-4006 

13. Type 01 Rmpoet ond P.r;od Co-*~.c' 

Translation 

14. Sponrcring Aponcr Cod* 

17. Key Word. (Scltcttd by Aulhorfr)) 

- 

Translation of "Roentgen Satellit Statusbericht, 

1. Quartal 1986", DFVLR (Gem Aerospace Research Establishment), 

15. Supplementory Notcs 

i 

May 5, 1986, pp. 1-60 

Unlimited 

N AS A-H 0