| Date: | 1998-12-01 10:00:00 | |
| Sender: | Jean-Francois Mangin <[Mailed Jean-Francois Mangin <mangin@obs-azur.fr>]> | |
| Subject: | [SLR-Mail] No. 191: High orbiting satellites at GRASSE LLR | |
| Author: | Jean | |
| Content: | ******************************************************************************** SLR Electronic Mail 1998-12-01 10:00:00 UTC Message No. 191 ******************************************************************************** Author: Jean-Francois Mangin Subject: High orbiting satellites at GRASSE LLR Since the end of 1997 the Grasse LLR station is abble to operate on different satellites. We can > range on Lageos 1 and 2, on Etalon 1 and 2, on GPS 35 and 36 and on Glonass satellites. > Since November 1997 we have ranged 290 Lageos and a few number of Etalon and GPS. > Since the beginning of the IGEX campaign we range with high priority (the highest priority is the > moon) on Glonass and GPS satellites. Up to now we have ranged about 10 GPS passes and 75 Glonass passes. > The ID number of the station is 7845 and all the normal points are at EDC. We hope they will be > transmitted to the CDDIS. > The principal features of the Grasse LLR station are : Acronym GRASLLR > NASA ID : 7845 > > Position: > geoc. coordinates and excentricity from the ITRF96 solution : > ITRF96 AT EPOCH 1997.0 AND VELOCITIES, R= 6378136.00, f=298.257810 > Station type site : 10002 S002 Grasse > X(m) = 4581691.675 ~0.002 > Y(m) = 556159.550 ~0.002 > Z(m) = 4389359.496 ~0.003 > Excentricity : > Ex(m) = 0.542 ~0.000 > Ey(m) = 36.489~0.000 > Ez(m) = -4.421 ~0.000 > > Speed origine : 010197 EURA i96i96 > Xp(m/year) = 0.0120 ~.0003 > Yp(m/year) = 0.0189 ~.0004 > Zp(m/year) = 0.0106 ~.0003 > > 7845 coordinates (WGS84) at the same epoch : > Longitude : 6.92157199317852 > Latitude : 43.7546316061432 > Ellipsoid Ht. : 1323.3675 > > We range on these satellites with the same configuration than for the moon : > Single photon mode. > Avalanche photodiode detector. > Laser : pulsewidth : 130 ps, Wavelength : 532 nm. > Real time calibration. > For far satellites (GPS, Glonass) we track these satellites for 10 to 12 minutes period and we > create normal points. If the next tracking period is far than one hour we create new normal > points. This method permit to have a new header record with a new calibration (the calibration could change on few hours period). A complete pass could be in different normal points files. For example we produce for the GP35 from the 98/10/12 three different files with 9,3 and 3 normal points but it is the same pass. > > For team disponibility reasons, the most important number of passes is obtained during the day and it seems complementary with other ranging stations > > For complmentary information please contact : > Jean-Francois Mangin > LLR manager > Mangin@obs-azur.fr ------------------------------------- Name: Jean-Francois Mangin E-mail: mangin@obs-azur.fr Time: 18:02:48 ------------------------------------- [Mailed From: Jean-Francois Mangin ******************************************************************************** |