分布式多通道雷达成像技术

该文针对稀疏分布的多发射/接收阵元所形成的多通道雷达系统，提出了一种分布式多通道雷达成像技术。利用发射/接收阵元角度分集和信号分集的特点，将各个通道上的信号进行相干合成获得在目标散射函数波数域二维支撑域上的等效观测。经过支撑域整形和数据重采样，可反演出目标散射函数的二维图像。该雷达成像系统不需要庞大的天线，只需要多通道雷达的单次快拍即可成像，从而避免了ISAR成像中的运动补偿问题。并且由于采样点在波数上的位置已知，可对重构的目标二维散射函数进行准确地定标。文中给出了具有宽带发射信号的多通道成像系统，仿真结果表明了该系统具有很好的成像性能。

An Imaging Technique Based on Distributed Multi-channel Radars

This paper proposes an non-cooperative target imaging technique based on the distributed multi-channel radar system, which consists of multiple sparsely-located transmitters and receivers. By coherently processing the signals received in multiple radar channels, the wave-number samples in a plane are obtained, from which the two-dimensional reflectivity function of target is reconstructed. Due to the simultaneous formation of multi-channel echo data and coherent processing of a single “snap”, it does not require large antennas, and the complicated motion compensation performed in ISAR imaging is not needed. Meanwhile, the reconstructed images are naturally scaled because the sampling locations in wave-number space are known. To validate the imaging performance, the distributed radar systems with wide-band transmitted signal are designed respectively, and the simulations are demonstrated.