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Data Correction

Data Correction Free Format

System Configuration and CoM Corrections for LAGEOS

Corrections for Stanford Counters

   

Stanford Counter Corrections

(as of 10-Jun-2008)

ILRS
Code
Site Name
Pad
ID
LEO
Correction
LAGEOS
Correction
GPS
Correction
Start Date
End Date








BEIL
Beijing
7249
-2
-2
- 3
01/20/2001
-
BORL
Borowiec
7811
-9
-9
0
05/07/2002
-
BREF
Brest
7604
0
0
- 1
07/01/2001
-
GLSV
Kiev
1824
+ 4
+ 4
+ 3
11/10/1999
-
HELW
Helwan
7831
+10
+10
+ 9
05/15/1999
-
HERL
Herstmonceux
7840
+ 2
+ 2
+ 2
10/01/1994
01/31/2002
HERL
Herstmonceux
7840
-6
-6
- 6
01/02/2002
02/10/2007
KTZL
Katzively
1893
+10
+10
+ 9
06/20/1998
-
KUNL
Kunming
7820
+ 1
+ 1
0
05/20/1998
-
POT3
Potsdam
7841
+ 5
+ 5
+ 5
07/20/2001
02/19/2004
POTL
Potsdam
7836
+ 3
+ 3
+ 3
05/08/1992
-
SFEL
San Fernando
7824
+ 8
+ 8
+ 8
08/10/2001
-
SISL
Simosato
7838
+11
+11
+10
07/01/2004
-
SJUL
San Juan
7406
+10
+10
+ 9
01/20/2006
-
WUHL
Wuhan
7231
+10
+10
+ 9
01/01/1999
-
ZIML
Zimmerwald
7810
-3
-3
-3
01/01/1997
-
GRSL
Grasse
7835
+ 9
+ 9
+ 8
09/01/1995
-

The table above gives estimates of corrections in mm to be added to one-way range measurements from each station for the time period shown and as a function of satellite distance broadly given at LEO, LAGEOS and GPS heights. The stations and data given in bold refer to estimates of Stanford counter errors that have been determined using high-precision linear event timers at the Space Geodesy Facility, Herstmonceux. Results for the other stations have been estimated from the known characteristics of Stanford counters, along with knowledge of calibration-board distances and calibration values reported in the site logs and in the stations’ ILRS data. These results should be taken as estimates only of the probable range errors for each station; the complex error-functions of the counters impose 2-3mm periodic errors, the exact magnitudes of which vary according to individual installation details, including cable lengths, etc., that will not be re-created on the test bench. The counters from San Juan and Beijing will be tested at Herstmonceux during early summer 2008.

A PDF document of the correction table is also available. For further information contact Graham Appleby.


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