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Spectrum reconstruction and the performance analysis for multichannel bidirectional SAR

多通道双指向合成孔径雷达频谱重建与性能分析

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Abstract

Single-channel bidirectional synthetic aperture radar (BiDi-SAR) systems require the pulse repetition frequency (PRF) to be cautiously designed. Firstly, it should be higher than the total bandwidth of the two Doppler subbands; secondly, it should be carefully selected so that the two Doppler subbands are properly located. We introduce multichannel BiDi-SAR imaging mode to realize bidirectional high resolution wide swath (HRWS) imaging. Acquisition geometry of multichannel BiDi-SAR is interpreted. Doppler spectrum of BiDi-SAR consists of two subbands with limited bandwidth. Based on a prior knowledge about the location of the Doppler subbands, we derive the method for separating the aliased Doppler spectra for general PRFs. Then, we analyze the reconstruction performance in terms of azimuth ambiguity to signal ratio (AASR) and signal to noise ratio (SNR). Besides, we propose to use a properly designed sparse array antenna to improve the azimuth ambiguity performance. Validity of the signal processing method is verified by simulation results.

创新点

单通道双指向合成孔径雷达 (BiDi-SAR) 对系统PRF有着较为苛刻的要求: 首先, 系统PRF必须高于多普勒谱总带宽; 其次, 所选择的PRF应当能够使得卷绕到基带的两个多普勒子频带正好错开, 从而通过带通滤波将与前后两个波束想对应的两个多普勒子频带予以分离。本文提出多通道BiDi-SAR观测模式以实现双指向高分辨率宽测绘带 (HRWS) 宽测。对多通道BiDi-SAR模式的工作原理进行了阐释。基于BiDi-SAR多普勒谱的各子频带位置的先验性息, 推导了适用于一般PRF条件的多普勒谱分离方法。对方位模糊比 (AASR) 以及信噪比 (SNR) 等关键的重建性能进行分析, 给出了解析表达式。此外, 提出利用稀疏阵列天线实现天线方向图的优化从而实现BiDi-SAR AASR性能的提升。

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Authors and Affiliations

  1. School of Electronic Science and Engineering, National University of Defense Technology, Changsha, 410073, China

    XiLe Ma, Zhen Dong, Feng He, ZaoYu Sun & DianNong Liang

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  1. XiLe Ma
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  2. Zhen Dong
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  3. Feng He
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  4. ZaoYu Sun
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  5. DianNong Liang
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Correspondence to XiLe Ma.

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Ma, X., Dong, Z., He, F. et al. Spectrum reconstruction and the performance analysis for multichannel bidirectional SAR. Sci. China Inf. Sci. 58, 1–13 (2015). https://doi.org/10.1007/s11432-014-5265-7

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