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Proceedings Paper

Spectral analysis of SLR full-rate data for timer problem detection
Author(s): Toshimichi Otsubo; Graham M. Appleby
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Paper Abstract

We have devised a new method to identify a timer's behavior at frequencies of tens of megahertz which corresponds to the basic vernier frequency of the device. Our idea is that spectral analysis should be applied to the post-fit residual of full-rate satellite tracking data with respect to the two-way range. To attain tens of megahertz resolution and one ps sensitivity, we needed to collect nearly one million shots of full-rate data of low-orbit satellites, and we got them from Herstmonceux, UK, and Orroral, Australia. The results of the spectral analysis showed two clear peaks of a few ps exactly at 22.5 and 45 MHz in Herstmonceux data, and a peak with a similar size exactly at 1 MHz in Orroral data. We conclude this effect is very small for these two stations. However, in general, we have shown that this kind of analysis can detect such a timer-related problem which will cause an offset bias due to the fixed-range nature of ground target calibration.

Paper Details

Date Published: 15 December 1999
PDF: 5 pages
Proc. SPIE 3865, Laser Radar Ranging and Atmospheric Lidar Techniques II, (15 December 1999); doi: 10.1117/12.373037
Show Author Affiliations
Toshimichi Otsubo, NERC Satellite Laser Ranging Facility (Japan)
Graham M. Appleby, NERC Satellite Laser Ranging Facility (United Kingdom)

Published in SPIE Proceedings Vol. 3865:
Laser Radar Ranging and Atmospheric Lidar Techniques II
Ulrich Schreiber; Christian Werner, Editor(s)

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