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System distortion analysis and compensation of DIFS signals for wideband imaging radar

宽带成像雷达中直接中频采集信号系统失真分析和补偿

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  • Special Focus on High-Speed Signal Processing
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Abstract

System distortion is inevitable in wideband imaging radar, which needs to be compensated precisely. In traditional wideband imaging radar for space surveillance, a linear frequency modulation signal is transmitted and the echoed signal is received with dechirping processing. In this case, the system distortion changes with the target range, making it hard to compensate the distortion. However, the direct intermediate frequency sampling (DIFS) signal maintains the complete system distortion and avoids the range variant distortion in the dechirped signal. Therefore, it is more convenient to perform system compensation in DIFS signal. In this paper, the distortion factors affecting the wideband radar systems are introduced. Then, the influence of the amplitude phase distortion on the focusing quality is analyzed in detail. Finally, a system compensation method in the frequency domain based on least squares estimation is proposed. In the proposed method, the compensation vectors are extracted from the calibration tower echoes for DIFS compensation. Inverse synthetic aperture radar imagery of targets can be achieved with improved focus quality. Simulations and real-data experiments confirm the effectiveness of the proposal.

摘要

创新点

本文针对宽带成像雷达系统, 详细分析了系统失真对采用直接中频采集信号进行宽带成像的影响, 并且提出了一种频域的系统失真补偿算法。 由于传统宽带成像雷达中去斜接收方式的移变性, 使得对去斜数据开展系统失真补偿十分困难, 而采用直接中频采集方式能很好地解决移变性影响。 本文首先介绍了直接中频采集信号中的系统失真影响环节, 然后详细分析了宽带雷达系统幅相失真对直采信号成像性能的影响, 最后提出了一种基于最小二乘估计的频域均衡的系统幅相失真校正方法。 文章通过仿真和实测数据, 验证了文中的分析过程和所提算法的正确性和有效性。

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Authors and Affiliations

  1. National University of Defense Technology, Changsha, 410073, China

    Yang Liu, QingKai Hou, ShiYou Xu & Biao Tian

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  1. Yang Liu
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  2. QingKai Hou
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  3. ShiYou Xu
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  4. Biao Tian
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Correspondence to Yang Liu.

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Liu, Y., Hou, Q., Xu, S. et al. System distortion analysis and compensation of DIFS signals for wideband imaging radar. Sci. China Inf. Sci. 58, 1–16 (2015). https://doi.org/10.1007/s11432-014-5252-z

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  • DOI: https://doi.org/10.1007/s11432-014-5252-z

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