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Acta Armamentarii ›› 2022, Vol. 43 ›› Issue (12): 3093-3102.doi: 10.12382/bgxb.2021.0678

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SAR/Doppler Radar Integration Design for Autonomous Navigation

DAI Zongwu, ZHANG Shaofu, LIU Naiqiang, HU Yue, WANG Zhe, DUAN Cenwei, SUN Yuzhe   

  1. (Space Star Technology Co., Ltd., Beijing 100095, China)
  • Online:2022-05-27

Abstract: To meet the requirement of satellite independent autonomous navigation in complex electromagnetic environments, a design that integrates Doppler Radar and Synthetic Aperture Radar (SAR) is proposed. Doppler Radar is used to complete high-precision velocity measurements, and the accuracy of the velocity measurements exceeds 0.2%. It can accurately correct the velocity cumulative error of inertial navigation in real time and improve navigation accuracy. SAR imaging technology is used to correct the position cumulative error of inertial navigation through scene matching, and thus to realize high-precision autonomous navigation. At the same time, to reduce the influence of the rigid platform introduced by the integration scheme on the accuracy of SAR imaging, the SAR imaging is compensated in real time by using instantaneous high-precision characteristics of inertial navigation, and the simulation results are given. The simulation results show that the azimuth resolution ratio and the focus depth of the SAR imaging after compensation have greatly improved. The azimuth resolution ratio has been increased from 6.01 m to 2.88 m, and focus depth increased from 1.3 dB to -30 dB, meet the scene matching correction requirements. The conclusion shows that the integrated scheme takes into account both velocity measurement and SAR imaging accuracy, meets the requirements of autonomous navigation operations, and has high effectiveness.

Key words: autonomousnavigation, syntheticapertureradar, dopplerradar, high-precisionvelocitymeasurement

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