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LAGEOS Sensitivity to Ocean Tides

Sośnica K.

Acta Geophysica

2015

Vol. 63, no. 4

1181--1203

Satellite Laser Ranging (SLR) to LAGEOS has a remarkable contribution to high-precise geodesy and geodynamics through deriving and validating various global geophysical models. This paper validates ocean tide models based on the analysis of satellite altimetry data, coastal tide gauges, and hydrodynamic data, i.e., CSR3.0, TOPEX4.0, CSR4.0A, FES2004, GOT00.2, and the CSRC Schwiderski model. LAGEOS orbits and SLR observation residuals from solutions based on different ocean tide models are compared and examined. It is found that LAGEOS orbits are sensitive to tidal waves larger than 5 mm. The analysis of the aliasing periods of LAGEOS orbits and tidal waves reveals that, in particular, the tidal constituent S2 is not well established in the recent ocean tide models. Some of the models introduce spurious peaks to empirical orbit parameters, which can be associated with S2, Sa, and K2 tidal constituents, and, as a consequence, can be propagated to fundamental parameters derived from LAGEOS observations.

Spectral analysis of Borowiec SLR data for spin determination of geodetic satellite EGP

Kucharski D., Schillak S., Lim H. C., Otsubo T.

Artificial Satellites : Journal of Planetary Geodesy

2013

Vol. 48, No. 1

15--23

Borowiec 10 Hz Satellite Laser Ranging (SLR) station is capable to measure spin of the Japanese Experimental Geodetic Satellite (EGP). Spectral analysis of 391 passes measured from March 10, 1994 to November 27, 2009 gives frequency signal representing the 3rd and the 6th harmonics of the satellite spin rate. Analysis of this signal, corrected for the apparent effects, indicates en exponential slowing down of the satellite: the spin rate decreases according to the equation f = 671.115907 exp(-4.08324 x 10-5 D) [mHz], where D is a day after launch. More than 15 years of the SLR measurements allowed investigating the initial spin rate of the satellite fini = 671.116, RMS = 0.203 [mHz] (initial spin period Tini = 1.49006, RMS = 0.0007 [s]).

A simple and efficient bus system to connect single units within a Satellite Laser Ranging system

Kirchner G., Koidl F., Kucharski D.

Artificial Satellites : Journal of Planetary Geodesy

2008

Vol. 43, No. 3

91--95

Complex systems - like SLR (Satellite Laser Ranging) systems – often need a large amount of cables to connect all remotely controllable add-on units, like flip mirrors, servo-motors, switches etc. on different groups (like mount / telescopes, laser, control PC, observer control station etc.). At the Graz kHz SLR station, more than fifty separate cables connecting these groups have been replaced now with a few single BNC cables, using a simple serial bus system. Each single BNC cable completely connects 2 units (e.g. the PC and the mount); there is no need for synchronization or handshake signals. Data transmission speed ranges from very low - down to a single transmit only on request, or on any change of bits - up to 10 MBits/s. This serial bus is flexible, easy to extent for future upgrades, and fast.