Author Topic: Existing software for Impulse Response Function determination  (Read 39 times)

June 08, 2018, 08:38:17 AM

ddequal

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Hi everybody from Matera,

I'm trying to make some analysis of the returns from Lageos ans Starlette satellites, and I'd like to perform a simulation of the retroreflected pulses from CCR array. So far I've used the John Degnan paper "Millimeter accuracy satellite laser ranging: a review". In particular, I used 6.1.4 and 6.1.8a for the cross section of each CCR and 6.5.1 for the time delay. The results don't match the data of figure 5.5-1 of "Prelaunch  Optical characterization of the Laser Geodynamic Satellite", where a different model is used (see appendix A). Unfortunately I couldn't find any other documentation of the RETRO program used for the prelaunch analysis.

I'd like to know if any of you have worked on IRF and has some advices on how to properly reproduce them, maybe including interference and far field diffraction patterns.

Cheers

Daniele

Today at 12:03:11 PMReply #1

jose_sgf

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In what way your results don't match those of fig. 5.5.1? The models given in Degnan's paper are based on empirical approximations, if I remember correctly, so I wouldn't expect the intensities to be spot on. But the geometry (delay) should be fine. Did you get this bit right for the orientation shown in the figure, i.e. a laser incident on the north pole of the satellite?