# Presentation: 248669

## SLR Global Performance Evaluation 

- Van S. Husson, ATSC
- 11th International Workshop on Laser Ranging
- Deggendorf, Germany
- September 21-25, 1998

## History

- Dr. Pearlman presented goals for a “high performance” station at the last Shanghai workshop (November 1996):
- First performance report card issued November 4, 1997 via SLRMail, one year after the Shanghai workshop using these goals as guidelines

## Global Performance Criteria

-  **Data Quantity (passes)**
-  1000 Low Earth Orbit (LEO) per year
-  400 LAGEOS 1,2 passes per year
-  100 High satellites (GPS, GLONASS, Etalon, Moon) segments per year
-  **Data Quality**
-  Single shot LAGEOS RMS (no goal specified)
-  LAGEOS normal point RMS (no goal specified)
-  _<_ 20 millimeter short term (3 months) range bias stability
-  _<_ 20 millimeter long term (1 year) range bias stability
** ****Operational Compliance**
-  Data format
-  Data delivery timeliness (_<_ 24 hours)
-  Up-to-Date Configuration information

## Global Performance Report Card (July 1, 1997 - June 30, 1998)

## Global SLR Data Volume    (July 1, 1997 - June 30, 1998)	

- 8000
- 7000
- 6000
- 5000
- 4000
- 3000
- 2000
- 1000
-    0

- Monument Peak
- Yarragadee
- Orroral
- Greenbelt (M7)
- Herstmonceux
- Wettzell
- Haleakala
- Graz
- Changchun
- McDonald
- Arequipa
- Potsdam
- Grasse
- Zimmerwald
- San Fernando
- Matera
- Beijing
- Shanghai
- Maidanak 2
- Borowiec
- Riga
- Metsahovi
- Komsomolsk
- Helwan
- Tahiti
- Simosato
- Tokyo
- Mendeleevo
- Cuba
- Metsahovi2
- Cagliari
- Wuhan
- Simeiz
- Katsively
- Riyadh
- TIGO

- Total Passes

**Global SLR Data Volume****    **(July 1, 1997 - June 30, 1998)

**Goal  **_**>**_** 1500 satellite passes /year**

## Global SLR Data Volume (Day vs. Night)

- Yarragadee
- Orroral
- Greenbelt (M7)
- Herstmonceux
- Wettzell
- Haleakala
- Graz
- Changchun
- McDonald
- Arequipa
- Potsdam
- Grasse
- Zimmerwald
- San Fernando
- Matera
- Beijing
- Shanghai
- Maidanak 2
- Borowiec
- Riga
- Metsahovi
- Komsomolsk
- Helwan
- Tahiti
- Simosato
- Tokyo
- Mendeleevo
- Cuba
- Metsahovi2
- Cagliari
- Wuhan
- Simeiz
- Katsively
- Riyadh
- TIGO

**Global SLR Data Volume (Day vs. Night)**

- Passes

- Percent

## LAGEOS Normal Point RMS(2nd Quarter 1998)

- 35
- 30
- 25
- 20
- 15
- 10
-  5
-  0

- LAGEOS NP RMS(mm)

- Monument Peak
- Yarragadee
- Greenbelt (M7)
- Herstmonceux
- Graz
- Tahiti
- Orroral
- Haleakala
- McDonald
- Arequipa
- Grasse
- Wettzell
- Potsdam
- Borowiec
- TIGO
- Zimmerwald
- Riga
- Metsahovi2
- Changchun
- Shanghai
- Maidanak 2
- Komsomolsk
- Helwan
- Cagliari
- Simosato
- San Fernando
- Beijing
- Simeiz
- Matera
- Wuhan

## Global SLR Data StabilityLAGEOS Long Term Bias Stability (July 1, 1998 - June 30, 1998)

- 50
- 45
- 40
- 35
- 30
- 25
- 20
- 15
- 10
-  5
-  0

- Bias Stability (mm)

- Yarragadee
- Monument Peak
- Wettzell
- Herstmonceux
- Graz
- Orroral
- McDonald
- Grasse
- Arequipa
- Potsdam
- Greenbelt (M7)
- Tahiti
- Borowiec
- Haleakala
- Zimmerwald
- Maidanak 2
- Changchun
- Matera
- Beijing
- Baseline
- Komsomolsk
- Riga
- Shanghai
- San Fernando
- Wuhan

**Goal  **_**<**_** 20 mm bias stability**

## Geographic Distribution of Global Data Volume

- 1-4,000

- 4,000-8,000

- 16,000-20,000

- 12,000-16,000

- 8,000-12,000

_**Legend**_

- _Pass Totals_

- 0

**Geographic Distribution of Global Data Volume**
**(Sep 95 - Aug 96)**

- Passes      17,613         3,568          4,134        11,854
**Systems**          17                7                3                 7

**Systems**       0                    2                 1                 2
- Passes          0              4,398          2,968          2,902

- 20,000-24,000

## Geographic Distribution of Global Data Volume

- 1-4,000

- 4,000-8,000

- 16,000-20,000

- 12,000-16,000

- 8,000-12,000

_**Legend**_

- _Pass Totals_

- 0

**Geographic Distribution of Global Data Volume**
**(Sep 97 - Aug 98)**

- Passes      20,296         5,385          3,544        14,043
**Systems**   18(+1)               7                3             4(-3)

**Systems**       0                1(-1)         2(+1)          1(-1)
- Passes          0              5,910          4789          2,205

- 20,000-24,000

**Notes:**
System            ID         Passes   Quadrant
RGO	7840	4071	1	
Wettzell	8834	3311	1	
Graz	7839	2865	1	
Grasse	7835	2170	1	
Potsdam	7836	2115	1	
San Fernand 7824	1539	1	
Matera	7939	1387	1	
Zimmerwald	7810	1009	1	
Borowiec	7811	700	1	
Riga	1884	679	1	
Metsahovi	7805	616	1	
Helwan	7831	507	1	
Riyadh	7832	228	1	
Cagliari	7548	204	1	
Simeiz	1873	179	1	
Metsahovi2	7806	136	1	
Katsively	1893	112	1	
Changchun	7237	2907	2	
Beijing	7249	1435	2	
Shanghai	7837	906	2	
Maidanak 2	1864	713	2	
Simosato	7838	419	2	
Komsomolsk	1868	374	2	
Mendeleevo	1870	246	2	
Wuhan	7236	216	2	
Haleakala	7210	3152	3	
Tokyo	7308	315	3	
Monument Pk	7110	7909	4	
Greenbelt 	7105	4827	4	
McDonald	7080	2455	4	
Cuba	1953	167	4	
Yarragadee	7090	5064	6	
Orroral	7843	4176	7	
Tahiti (M8)	7124	215	7	
Arequipa	7403	2158	8	

## 7105 Greenbelt - Aug 1, 1996, operator automation - 70% increase in data quantity the last 2 years
7110 Monument Peak - Oct 1, 1996, operator automation - 190% increase in data quantity the last 2 years
7237 Changchun - Aug 18, 1997 - new detector installed, 300% increase in data quality and 70% reduction in precision, the last 2 years 
7835 Grasse - Sep 4, 1997, new detector installed - 40% reduction in precision and improved bias stability (23 to 7mm)
1893 Katsively - June 24, 1998, new counter installation -200 cm range bias reduced to 0 cm range bias after July 13, 1998
8834 Wettzell - Sep - Oct 1996 -  data precision improvement (APD 35 to 25mm; MCP 17 to 11 mm)
7843 Orroral - 40% increase in data quantity the last 2 years
7811 Borowiec - July 1, 1998, new barometer - eliminated 3 to 4 millibar pressure error, 20% increase in data quantity the last 2 years

- 7110 Monument Peak - Oct 1, 1996, operator automation - 190% increase in data quantity the last 2 years
- 7237 Changchun - Aug 18, 1997 - new detector installed, 300% increase in data quality and 70% reduction in precision, the last 2 years
- 7835 Grasse - Sep 4, 1997, new detector installed - 40% reduction in precision and improved bias stability (23 to 7mm)
- 1893 Katsively - June 24, 1998, new counter installation -200 cm range bias reduced to 0 cm range bias after July 13, 1998
- 8834 Wettzell - Sep - Oct 1996 -  data precision improvement (APD 35 to 25mm; MCP 17 to 11 mm)
- 7843 Orroral - 40% increase in data quantity the last 2 years
- 7811 Borowiec - July 1, 1998, new barometer - eliminated 3 to 4 millibar pressure error, 20% increase in data quantity the last 2 years

**Systems with Improved Performance****(from 1996 to 1998)**

**Systems with Improved Performance****(from 1996 to 1998)**

- 7831 Helwan - 50% increase in data quantity the last 2 years
- 1873 Simeiz - 50% increase in data quantity the last 2 years
- 1870 Mendeleevo -30% increase in data quantity the last 2 years
- 7236 Wuhan - 100% increase in data quantity the last 2 years
- 7249 Beijing - 70% increase in data quantity the last 2 years, improved time bias problems
- 7824 San Fernando - 110% increase in data quantity the last 2 years plus added LAGEOS capability

## Monitoring System Performance

**Assumptions:**
- Established and follow **standard operating procedures**
- Document **configuration changes, component replacements, and routine  equipment maintenance**
**Trend Analysis:**
- LAGEOS Satellite and calibration RMS vs time (one year recommended)
- LAGEOS Range and time bias vs time (one year recommended)
- LAGEOS Range bias vs time of day (one year recommended)
- System delay vs time
- System delay vs. bias (short time intervals when system delay is relatively stable)
- Site Pressure Profile (3 or more years recommended)
- Bias vs. Pressure

## Satellite and Calibration RMS Trend Analysis

- RMS(mm)

**Satellite and Calibration RMS Trend Analysis**

## Satellite Range and Time Bias Trend Analysis

- mm/us

## Site Pressure Profile Analysis

**Site Pressure Profile Analysis**

- Pressure (Mb)