频域脉压对相位编码信号特殊旁瓣的抑制

相位编码信号是在雷达中广泛使用的一种脉冲压缩波形。对于二相编码及泰勒四相码信号，当采用传统频域的方法来处理时，不同时刻回波信号脉压主副比不一致，在某些特定的时刻，压缩输出会有一个较大的特殊旁瓣，以13位泰勒四相码为例，主副比少于25dB。从循环卷积的原理出发，分析了产生这种特殊旁瓣的原因，并提出了相应的抑制方法。经处理后，任何时刻回波信号脉压主副比均相同，且大于40dB。

Suppression of a Special Side-lobe of Phase Code Signal in Frequency Domain Pulse Compression

Phase code signal is a kind of pulse compression waveform which is widely used in radar system.For biphase code and Taylor quadriphase code signal,when the method of traditional frequency domain suppression is adopted,the RMS of echo signal at any point may be different.If the echo signal occurs at some particular points,the output of compression will contain a special high sidelobe,the RMS of 13 b Taylor quadriphase code is less than 25 dB.In this paper,the cause of the sidelobe is analyzed based on the theory of cyclic convolution and a corresponding suppression method is presented.After processed,the echo signal at any point has the same RMS which is larger than 40 dB.