15 December 1999 Spectral analysis of SLR full-rate data for timer problem detection
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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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Toshimichi Otsubo, Graham M. Appleby, "Spectral analysis of SLR full-rate data for timer problem detection", Proc. SPIE 3865, Laser Radar Ranging and Atmospheric Lidar Techniques II, (15 December 1999); doi: 10.1117/12.373037; https://doi.org/10.1117/12.373037
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