# Presentation: 924535

## E-1-3

- NPOESS Program and Spacecraft

## Nunn-McCurdy Impacts to A-DCS on NPOESS

- NPOESS is dual-funded by NOAA and DOD
- Nunn-McCurdy law (applies to DOD) required re-certification of NPOESS program to Congress
- This took place June 6th, 2006
- Recertified program differs in some respects from prior program
- 		- NPOESS returning to the original concept of two orbit planes
- 			- Two (sequential) satellites for each plane
- 		- NPOESS no longer populating the 21:30 ascending (9:30 	  descending) orbit
- 		- 21:30 orbit did not include A-DCS, so no A-DCS impact due 	  to fewer orbit planes
- 		- New launch dates (see below)

## Nunn-McCurdy Impacts to A-DCS on NPOESS (cont.)

- Initial order for two satellites,
- 		- option for additional two to be exercised in 2010
- Planned launch dates:	C1	2013
- 		C2	2016
- 		C3	2018
- 		C4	2020
- Spacecraft “need dates” for A-DCS instrument approximately 15 months prior to launch
- Actual spacecraft “need dates” for A-DCS will be developed during NGST replan
- Program runs through 2026

## NPOESS Contacts – June 2006

- IPO Payload  Hal Bloom	   _[hal.bloom@noaa.gov](mailto:hal.bloom@noaa.gov)_
- 			    Jim Morris    _[James.W.Morris@noaa.gov](mailto:James.W.Morris@noaa.gov)_
- IPO A-DCS    Mike Cummings
- 					  _[Michael.Cummings@noaa.gov](mailto:Michael.Cummings@noaa.gov)_
- NGST A-DCS Massih Hamidi* _[massih.hamidi@ngc.com](mailto:massih.hamidi@ngc.com)_
- NGST SI**	  Tim Gresham***    _[tim.gresham@ngc.com](mailto:tim.gresham@ngc.com)_
- ______
- *    Massih Hamidi replaced Greg Barber in this capacity
- **  SI=Systems Integration (responsible for ground interface 	control documents)
- ***Tim Gresham replaced Alexa Davis in this capacity

## Ground Interfaces

- A-DCS data and telemetry interface via NESDIS, not directly from NGST/NPOESS
- “mission” data, raw and converted housekeeping telemetry
- For other, direct, interfaces between CNES or CLS and NPOESS, NGST would like to utilize a web-based system
-  command requests, mission notices, ephemeris

## Ground Interfaces (cont.)

- Raw and engineering unit housekeeping telemetry to       NESDIS  "wrapped" in HDF5.  NESDIS responsible for forwarding that data in a mutually agreeable format, time frame, etc.
- Same as #1 for the A-DCS "mission data“
- NGST will provide an emergency telephone contact number to the control center
- Normal interactions to be through External Web Server, to which you will have access
- Command requests need to be entered into that Web         Server, from a single authorized source

## Ground Interfaces (cont.)

- 6) Peripheral information, comes from the External Web Server
- 	 - examples: ephemeris, predicted ephemeris for orbit-adjustment       maneuver, command history during pass, notice of events which    could (or did) affect the ability of A-DCS to provide useful data, etc.
- 7) Events which also resulted in turning off A-DCS (such as red out-of-limit condition, or a general Spacecraft Safe Mode) would ALSO be communicated to you "directly" , meaning phone, FAX, email, or whatever means is found mutually satisfactory.
- 8) Some degree of telemetry analysis available via requests to the Web Server.
- 9) NGST plans to send you ALL mission notices, not just the ones that apply to you, and you would need to decide if they apply to you or not.

## Ground Interface Schedule

- 17 May - NGST Deliver Accommodation Presentation to A-DCS *(complete)*
- 24 May - NGST Deliver preliminary ground ICD to A-DCS *(complete)*
- 9 June - A-DCS provide comments on Accommodation Presentation to NGST
- 16 June - NGST incorporate appropriate presentation comments into ICDs, Deliver updated ICD to A-DCS
- 27 June - A-DCS provide comments on ICDs to NGST
- Week of 10 July - ICD Stakeholder Review - discuss any unresolved issues
- 27 July - NGST Complete ICD comment adjudication and update ICDs for NGST Engineering Review Board process
- 18 August - Begin NGST ERB Process
- 29 September - Complete NGST ERB Process