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首页> 外文期刊>Aerospace and Electronic Systems, IEEE Transactions on >Frequency-Domain Bistatic SAR Processing for Spaceborne/Airborne Configuration
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Frequency-Domain Bistatic SAR Processing for Spaceborne/Airborne Configuration

机译：星空配置的频域双基地SAR处理

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摘要

This paper focuses on the bistatic synthetic aperture radar (BiSAR) signal processing in the spaceborne/airborne configuration. Due to the extreme differences in platform velocities and slant ranges, the airborne system operates in the inverse sliding spotlight mode, while the spaceborne system works in the sliding spotlight mode to achieve a tradeoff between the azimuth scene size and azimuth resolution. Such a mode is generally called double sliding spotlight mode. In this configuration, the echoed signal has two characteristics. Firstly, both transmitter and receiver have very short synthetic aperture times. Secondly, the airborne platform operates with wide squint difference, while the spaceborne platform works in the small squint case. According to these two features, we use different Taylor expansions to address the slant range histories of transmitter and receiver. Based on the presented model, a two-dimensional space-variant bistatic point target reference spectrum (BPTRS) is derived. Furthermore, we linearize the BPTRS to derive the transfer function of the baseband scene. From the transfer function, the signal features of the spaceborne/airborne configuration become very clear. Using the transfer function, the two-dimensional inverse scaled Fourier transform (ISFT) is used to focus the bistatic signal in the spaceborne/airborne configuration.
机译：本文重点研究星载/机载配置中的双基地合成孔径雷达（BiSAR）信号处理。由于平台速度和倾斜范围存在极大差异，机载系统以逆滑动聚光灯模式工作，而星空系统以滑动聚光灯模式工作，以在方位场景大小和方位分辨率之间进行权衡。这种模式通常称为双滑动聚光灯模式。在这种配置中，回声信号具有两个特性。首先，发射器和接收器都具有非常短的合成孔径时间。其次，机载平台斜视差别较大，而机载平台斜视情况较小。根据这两个特征，我们使用不同的泰勒展开来解决发射机和接收机的倾斜范围历史。基于提出的模型，推导了二维空变双基地点目标参考光谱（BPTRS）。此外，我们将BPTRS线性化以导出基带场景的传递函数。从传递函数来看，星空配置的信号特征变得非常清晰。使用传递函数，二维逆标度傅立叶变换（ISFT）用于将双基地信号聚焦在星空/机载配置中。

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