首页|Localization of Ground-Based Periodic Pulse Interferers Using Time Difference of Arrival Estimation in SAR Satellite Systems
Localization of Ground-Based Periodic Pulse Interferers Using Time Difference of Arrival Estimation in SAR Satellite Systems
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NETL
NSTL
IEEE
Signals emitted by ground-based sources frequently interfere with those received by spaceborne synthetic aperture radar (SAR) systems, with periodic pulses from ground radars being the most common form of interference. This article introduces a method to locate the source of these pulsed signals utilizing SAR echo data. Initially, the time difference of arrival (TDOA) for each pulse transmitted by the interferer and received by the SAR satellite is estimated. A mapping relationship between the interferer coordinates (latitude and longitude) and the variations in TDOA is then established. Using this mapping, the localization of the interferer is finally performed via a 2-D search approach. The proposed method is highly versatile and applicable to systems consisting of one single SAR, constellations of SAR instruments, and configurations of multichannel single-instrument SAR systems. Regardless of the modulation form of the interfering signal, the method remains effective. The accuracy of the method is analyzed and the factors influencing the localization precision are investigated. Finally, using the Gaofen-3 spaceborne SAR, an experimental validation of the proposed TDOA-based localization method is performed. Results indicate that the positioning error of an interference source based on two consecutive satellite measurements is only 3.7 km.
NETL
NSTL
IEEE
