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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Azimuth Signal Multichannel Reconstruction and Channel Configuration Design for Geosynchronous Spaceborne–Airborne Bistatic SAR
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Azimuth Signal Multichannel Reconstruction and Channel Configuration Design for Geosynchronous Spaceborne–Airborne Bistatic SAR

机译：地球同步星空双基地SAR方位角信号多通道重构和通道配置设计

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摘要

In geosynchronous spaceborne-airborne bistatic synthetic aperture radar (GEO-BiSAR) system, the airborne platform achieves high-resolution imaging by passively receiving the signal from the interested scenario. In this paper, the Doppler characteristics of GEO-BiSAR and the individual contribution of the transmitter and the receiver are first analyzed. The airborne receiver is found to be the dominant contributor for the total Doppler bandwidth, which will lead to Doppler spectrum aliasing regarding the low pulse repetition frequency (PRF) adopted by the GEO-SAR. In order to suppress the Doppler ambiguity without adjusting the PRF of GEO-SAR, azimuth multichannel receiving technique is introduced to the airborne receiver. The multichannel transfer function is derived based on the method of series reversion and the spectrum reconstruction algorithm is then modified for multichannel GEO-BiSAR. Moreover, the reconstruction performance is closely related to the corresponding spacing between each channel (i.e., channel configuration). Therefore, the channel configuration design for GEO-BiSAR aims at optimizing the azimuth ambiguity-to-signal ratio with a satisfactory level of signal-to-noise ratio scaling factor by adjusting the channel configuration. The channel configuration design is modeled as a constrained single objective optimization problem (CSOP). Then, a channel configuration design method based on differential evolution and feasibility rule is proposed to solve the CSOP and obtain the channel configuration for the receiver with the optimal reconstruction performance. Finally, simulations results are presented to verify the effectiveness of the proposed method, and characteristics of channel configuration are analyzed in detail, which can be a practical guide for the implementation of multichannel GEO-BiSAR systems.
机译：在地球同步星空机载双基地合成孔径雷达（GEO-BiSAR）系统中，机载平台通过被动接收感兴趣场景中的信号来实现高分辨率成像。本文首先分析了GEO-BiSAR的多普勒特性以及发射器和接收器的个体贡献。机载接收机是总多普勒带宽的主要贡献者，这将导致GEO-SAR采用的低脉冲重复频率（PRF）引起的多普勒频谱混叠。为了在不调整GEO-SAR的PRF的情况下抑制多普勒模糊度，将方位多信道接收技术引入了机载接收机。基于序列回归的方法推导了多通道传递函数，并对多通道GEO-BiSAR的频谱重构算法进行了修改。而且，重建性能与每个通道之间的相应间隔（即，通道配置）密切相关。因此，GEO-BiSAR的信道配置设计旨在通过调整信道配置，以令人满意的信噪比缩放因子水平来优化方位角模糊度与信号比。通道配置设计被建模为约束单目标优化问题（CSOP）。然后，提出了一种基于差分演化和可行性规则的信道配置设计方法，以解决CSOP问题，并获得具有最佳重构性能的接收机信道配置。最后，通过仿真结果验证了所提方法的有效性，并详细分析了信道配置特性，为多信道GEO-BiSAR系统的实现提供了实用的指导。

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