Time-frequency synchronization error estimation method for the satellite-to-ground bistatic SAR for a navigation satellite

被引：0
|
作者：
Ti J. [1 ]
Suo Z. [1 ]
Wang T. [1 ,2 ]
Zhao B. [3 ]
Zhang L. [1 ]
机构：
[1] National Laboratory of Radar Signal Processing, Xidian University, Xi'an
[2] Sichuan Institute of Aerospace Electronic Equipment, Sichuan
[3] Beijing Institute of Spacecraft System Engineering, Beijing
来源：
Xi'an Dianzi Keji Daxue Xuebao/Journal of Xidian University | 2023年 / 50卷 / 02期
关键词：
Beidou 3 Navigation Satellite; bistatic SAR; GEO SAR; ranging code; time-frequency synchronization;
D O I：
10.19665/j.issn1001-2400.2023.02.005
中图分类号：
学科分类号：
摘要：
In order to verify the mechanism of GEO SAR imaging with a long synthetic aperture time, the equivalence verification is executed by satellite-to-ground bistatic configuration, which is composed of the Beidou 3 IGSO navigation satellite and the ground-stationary receiver. According to the signal characteristics of navigation satellites and the time-frequency synchronization problem of the satellite-to-ground bistatic SAR, based on the echo data a time-frequency synchronization error estimation method of satellite-ground bistatic SAR echo data is proposed to estimate the delay error of navigation satellite ranging code and correct the error. First, the on E-dimensional direct wave signal and the reflected wave signal are divided into two dimensions according to the pulse repetition frequency of the navigation satellite, which preserves the integrity of the whole collected signal. The correct peak position sequence under non-ideal sampling environment is obtained by the matching filter on the range of the direct wave signal, and then the peak position sequence is used to complete the time synchronization error compensation of the direct wave signal and the reflected wave signal, and so with the correction of the local ranging code, which solves the problem of the mismatch between the envelope distribution of the distance pulse pressure signal after time synchronization and the theorectical model in the satellite-ground bistatic SAR imaging of the Beidou-3 IGSO navigation satellite. Second, the corrected local ranging code is used to obtain the direct wave peak phase vector by matching filtering the direct wave signal. Finally, the peak phase vector is used to perform frequency error compensation, followed by the bistatic SAR imaging processing of the reflected wave signal. The processing results of the measured data verify the effectiveness of the proposed method. © 2023 Science Press. All rights reserved.
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页码：42 / 53
页数：11
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