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Motion Detection and Simulation in Dual-Satellite Geolocation System

YE Shang-fu

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Abstract

Dual-satellite geolocation system can locate a stationary emitter on Earth by using time and frequency differences of arrival (TDOA/FDOA). However, emitter motion will cause a bias on the FDOA, resulting in calculated positions with unacceptable errors. If motion is detected, the position is known to be inaccurate. Two algorithms for motion detection based on TDOA/FDOA measurements were proposed by using fit test and Rao test which just need the position estimation of stationary hypothesis. The performances were analyzed and compared, and the availability was verified by the simulation results.

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What this paper is about

Dual-satellite geolocation system can locate a stationary emitter on Earth by using time and frequency differences of arrival (TDOA/FDOA). However, emitter motion will cause a bias on the FDOA, resulting in calculated positions with unacceptable errors. If motion is detected, the position is known to be inaccurate. Two algorithms for motion detection based on TDOA/FDOA measurements were proposed by using fit test and Rao test which just need the position estimation of stationary hypothesis. The performances were analyzed and compared, and the availability was verified by the simulation results.

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Available abstract

Dual-satellite geolocation system can locate a stationary emitter on Earth by using time and frequency differences of arrival (TDOA/FDOA). However, emitter motion will cause a bias on the FDOA, resulting in calculated positions with unacceptable errors. If motion is detected, the position is known to be inaccurate. Two algorithms for motion detection based on TDOA/FDOA measurements were proposed by using fit test and Rao test which just need the position estimation of stationary hypothesis. The performances were analyzed and compared, and the availability was verified by the simulation results.

Key concepts: FDOA, Geolocation, Multilateration, Common emitter, Computer science, Position (finance), Satellite, Motion (physics)

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