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多发多收(MIMO)雷达是一种新的雷达体制,具有许多突出的优点.将MIMO技术应用于对地观测的SAR系统,将为高性能地完成高分辨率、宽测绘带成像和GMTI等功能提供有效途径.正交波形优化设计是MIMO雷达研究中的基础性关键问题.首先针对SAR应用的特点,考虑同频编码正交信号之间互相关能量影响,提出了综合积分旁瓣比指标定义.然后通过理论分析和一维数值仿真论证了同频编码正交信号综合积分旁瓣比性能无法满足SAR成像的要求;再通过数值仿真验证了失配滤波处理仍然无法改善同频编码正交信号的综合积分旁瓣比性能.最后优化设计了一组相位编码正交信号作为MIMO-SAR发射信号,通过MIMO-SAR成像和InSAR仿真试验,进一步验证了分析结论的有效性.
Multiple-output multiple-input (MIMO) radar is a new radar system with many outstanding advantages. The application of MIMO technology to earth observation SAR systems will enable high-resolution, wideband imaging and GMTI for high performance Function.Orthogonal waveform optimization design is the fundamental key issue in the research of MIMO radar.At first, considering the characteristics of SAR applications and considering the influence of cross-correlation energy between the orthogonal signals with the same frequency, the integrated integral sidelobe ratio indicator Then the theoretical analysis and one-dimensional numerical simulation demonstrate that the performance of the integrated integral side-lobe ratio of the quadrature signals with the same frequency can not meet the requirements of SAR imaging. The numerical simulations show that the mismatch filter processing still can not improve the orthogonal frequency coding orthogonal And then the side-lobe ratio performance of the integrated signal is optimized.Finally, a set of phase-coded quadrature signals is optimized as the MIMO-SAR transmission signal. The effectiveness of the analysis is further verified by MIMO-SAR imaging and InSAR simulation.