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ILRS Home  Stations Site Information Data Correction Stanford Counter Corrections
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Stanford Counter Corrections
As of 12-Jan-2009 (PDF)
| Station | Name | PAD ID | Target-board- range dependent (mm) | LEO specific (mm) | LAGEOS-specific (mm) | ETALON-specific (mm) | Start year-doy (yymmdd at 00:00) | Stop year-doy (yymmdd at 00:00) |
| BEIL | Beijing | 7249 | +12 | +10 | +10 | +9 | 2001 020 (010120) | - |
| BORL | Borowiec | 7811 | +9 | 0 | 0 | +9 | 2002 127 (020507) | - |
| BREF | Brest | 7604 | +10 | +10 | +10 | +9 | 2001 182 (010701) | - |
| GLSV | Kiev | 1824 | +6 | +10 | +10 | +9 | 1999 314 (991110) | - |
| HELW | Helwan | 7831 | 0 | +10 | +10 | +9 | 1999 135 (990515) | - |
| KTZL | Katzively | 1893 | 0 | +10 | +10 | +9 | 1998 171 (980620) | - |
| KUNL | Kunming | 7820 | +9 | +10 | +10 | +9 | 1998 140 (980520) | - |
| POT3 | Potsdam | 7841 | 0 | +5 | +5 | +5 | 2001 201 (010720) | 2004 050 (040219) |
| POTL | Potsdam | 7836 | 0 | +10 | +10 | +9 | 1992 129 (920508) | - |
| SFEL | San Fernando | 7824 | 0 | +8 | +8 | +8 | 2001 222 (010810) | - |
| SISL | Simosato | 7838 | +1 | +10 | +10 | +9 | 2004 183 (040701) | - |
| SJUL | San Juan | 7406 | 0 | +10 | +10 | +9 | 2006 020 (060120) | - |
| WUHL | Wuhan | 7231 | 0 | +10 | +10 | +9 | 1999 001 (990101) | - |
| GRSL | Grasse | 7835 | +1 | +10 | +10 | +9 | 1995 244 (950901) | - |
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. The correction to be added to a given satellite range observation is the sum of the target-board-range dependent correction and that given for the specific satellite distance broadly characterized for LEO, LAGEOS and ETALON 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 for calibration 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., which will not be re-created on the test bench even when measurements have been carried out on the actual devices.
For further information contact Graham Appleby.
One-way Range Corrections for Station 7840 Herstmonceux from Engineering Analysis
As of 12-Jan-2009
(add the TOTAL correction to the one-way satellite range during the dates given in columns A & B)
(PDF)
START |
STOP |
Target-board-range dependent |
Satellite-range dependent |
Filter correction |
TOTAL Correction |
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| PREVIOUS (080530) [1] |
CURRENT (090112) [2] |
PREVIOUS
(080530) [3] |
CURRENT (090112) [4] |
PREVIOUS (080530) [6]=[1]+[3] |
CURRENT (090112) [7]=[2]+[4]+[5] |
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| 1983 274 (831001) | 1994 013 (940113) | - | - | - | - | +1.5 | - | +1.5 |
| 1994 013 (940113) | 1994 274 (941001) | - | +6 | - | SLRMail 0891 | +1.5 | - | +7.5+[4] |
| 1994 274 (941001) | 1996 137 (960516) | -5.5 | +6 | +8 | SLRMail 0891 | +1.5 | +2(2.5) | +7.5+[4] |
| 1996 137 (960516) | 1997 295 (971022) | -5.5 | +4 | +8 | SLRMail 0891 | +1.5 | +2(2.5) | +5.5+[4] |
| 1997 295 (971022) | 1999 210 (990729) | -5.5 | +2 | +8 | SLRMail 0891 | +1.5 | +2(2.5) | +3.5+[4] |
| 1999 210 (990729) | 2001 080 (010321) | -5.5 | +9 | +8 | SLRMail 0891 | +1.5 | +2(2.5) | +10.5+[4] |
| 2001 080 (010321) | 2002 032 (020201) | -5.5 | 0 | +8 | SLRMail 0891 | +1.5 | +2(2.5) | +1.5+[4] |
| 2002 032 (020201) | 2002 277 (021004) | -5.5 | 0 | 0 | - | +1.5 | -6(-5.5) | +1.5 |
| 2002 277 (021004) | 2006 200 (060719) | -5.5 | +13 | 0 | - | +1.5 | -6(-5.5) | +14.5 |
| 2006 200 (060719) | 2007 042 (070211) | -5.5 | +12 | 0 | - | +1.5 | -6(-5.5) | +13.5 |
| 2007 042 (070211) | - | - | 0 | 0 | - | 0 | 0 | 0 |
NOTE (a): that the satellite-range-dependent correction given in SLRMail #0891 is in two-way ps, and that it should be applied from 1994 day 013 to 2002 day 031 inclusive (NOT JUST from 1994 October 1 as stated in the SLRMail #0891).
NOTE (b): if you have already applied the SLRMail #0891 corrections to the data (at the individual range level), you should NOT repeat the addition of [4] in column [7]!!!
NOTE (c): in column [6], the previously published values in the ILRS web pages table (May 30, 2008) were rounded to integer millimeters, while the originally presented values at the Grasse (ILRS AWG meeting, Sept. 24, 2007), were given with an extra decimal, so we have included those values in (…) for clarity.
Responsible Government Official: Carey Noll
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