方位多通道SAR信号重建性能分析

方位多通道合成孔径雷达(SAR)图像质量受系统参数、阵列误差以及信号处理方法等多种因素的影响。该文针对方位多通道SAR的信号重建性能进行深入分析。首先对信号模型进行完善，引入了重建系数的概念，从而使得多通道SAR信号重建网络的设计具有更大的灵活性，继而在数字波束形成的框架下对一系列重建方法进行了介绍。其次，在得到重建误差功率谱的基础上，进一步给出信噪比与方位模糊比的解析表达式。最后，对各种算法的重建性能进行了定量评估与分析。仿真实验验证了理论分析的正确性。分析结果将为方位多通道SAR系统设计、信号处理以及图像质量预估提供有效支撑。

Signal Reconstruction Performance Analysis of Azimuth Multi-channel SAR

Image quality of azimuth multi-channel SAR is influenced by such factors as system parameters, array errors, and signal processing strategies. The image quality of azimuth multi-channel SAR is studied deeply. Firstly, the signal model is improved. The introduction of the reconstruction coefficient provides more flexibility for designing the reconstruction network. In the frame of digital beam-forming, a series of reconstruction algorithms are then discussed for signal reconstruction. Secondly, based on the power spectrum of the reconstruction error, the analytical expressions of output Signal to Noise Ratio (SNR) and Azimuth Ambiguity to Signal Ratio (AASR) are deduced. Thirdly, the performance of the reconstruction algorithms is assessed quantitatively. Simulation experiment results confirm the validity of the theoretical analysis. Theoretical results provide technique support to system design, signal processing and image quality evaluation of azimuth multi-channel SAR.