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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：地球同步星弓形空气载体BISTOG SAR的方位角信号多通道重建和通道配置设计

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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：在地球同步星载 - 机载的双孔合成孔径雷达（Geo-Bisar）系统中，空气载体平台通过从感兴趣的方案中被动地接收信号来实现高分辨率的成像。本文首先分析了地质衡量的多普勒特性和发射机和接收器的各个贡献。发现空中接收器是总多普勒带宽的主要贡献者，这将导致关于Geo-SAR采用的低脉冲重复频率（PRF）的多普勒频谱混叠。为了抑制多普勒的模糊，无需调整地理SAR的PRF，向空中接收器引入了方位角多通道接收技术。基于串联回变的方法导出多通道传递函数，然后对多通道地质培训进行修改频谱重建算法。此外，重建性能与每个信道（即信道配置）之间的相应间隔密切相关。因此，Geo-Bisar的信道配置设计旨在通过调整信道配置来优化与令人满意的信噪比缩放系数的方位模糊到信号比。信道配置设计被建模为约束的单个客观优化问题（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来解决CSOP并获得接收器的信道配置，具有最佳的重建性能。最后，提出了仿真结果以验证所提出的方法的有效性，详细分析了通道配置的特性，这可以是实现多通道地质培训系统的实用指南。

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