星载雷达应用多频率多通道技术研究

Research on multi-channel multi-frequency technology application of spaceborne radar

系统自由度不足会导致星载雷达系统的运动目标检测性能下降。多通道技术可以利用空域多自由度提高系统杂波抑制性能,多频率发射技术可以改善系统速度响应,同时有助于解多普勒模糊。由于两者具有明显的互补性,提出将两种技术结合来改善系统目标检测性能,并且简要推导了输出信杂噪比和检测概率的表达式。仿真结果显示采用此方法得到的输出信杂噪比和检测概率均明显优于单种频率的结果,表明方法有效。

The deficiency in degrees of freedom （DOF） can cause degradation of ground moving target indication （GMTI） performance for spaceborne radar systems. Multi-channel technology can provide more spatial diversity to improve the clutter suppression capability of the system, while multi-frequency technology has the merits of improving velocity response and also being helpful to resolve the Doppler ambiguity. Since two methods are remarkably complementary to one another, a method to improve the GMTI performance by combining the two technologies is presented. Both the expressions of the signal-to-clutter-plus-noise ratio at the output （SCNRout） and the detection probability （Pd） are also derived. Simulation results show that both SCNRout and Pd of the proposed method significantly outperform the single frequency case, which demonstrates the effectiveness of the proposed method.