一种有效降低寄生频谱的包络移动补偿方法

A valid motion compensation for reducing parasitical spectrum in long time coherent integration

长时间积累或高速目标跟踪场合常用移位或插值方法避免目标运动导致的积累损失,但移位或插值操作引入的寄生频谱干扰了小目标的检测和跟踪。结合数字脉压过程,本文提出一种新的补偿方法,利用chirp信号的多谱勒-距离耦合特性控制包络走动。新算法有效控制了幅度调制和由此带来的寄生频谱。仿真结果表明,新算法能进一步改善低信噪比条件下的检测性能。

The interpolation processing is usually used in long time coherent integration or high velocity target tracking occasion to avoid the integration loss resulted from the target motion.However,the parasitical spectrum induced by these operations will interfere the detection and tracking of small targets.Combining with the digital pulse compression process,a novel compensation method is put forward,which is based on the Doppler-range coupling characteristic.The proposed method can control the amplitude modulation and the corresponding parasitical spectrum effectively.Simulation results demonstrate the detection performance under low SNR can be further improved by the proposed method.