一种大多普勒容限的伪码调相连续波雷达

Novel Phase-coded Modulation Continuous-wave Radar with Large Doppler Tolerance

针对伪码调相雷达信号的多普勒敏感性,构建了一种基于m序列移位相乘特性的伪码调相连续波雷达系统。该系统通过对正交化后的目标回波信号进行延时交叉相乘求差处理,其多普勒容限可达子码重复频率的一半,因此可以有效应用于高速超高速目标的搜索和跟踪。由于脉压输出为频域的幅度调制信号,静止和低速目标干扰也能得到有效抑制,故该系统还兼具动目标检测功能。该文给出了雷达系统框图及实现方法,并进行了理论分析和系统仿真,展望了其工程价值。

To diminish the Doppler sensitivity of phase-coded modulation radar signal, a novel phase-coded modulation continuous-wave radar based on the cycle and multiplication properties of m-sequences is constructed. Echoes are orthogonalized firstly in the receiver and then they do cross multiplication after adequate delay. The differential output of the two channels is applied to the correlation detection. With the data pretreatment, the bad effect of Doppler frequency on the correlation detection can be efficiently suppressed. The radar＇ s Doppler tolerance can reach the half of the code rate and therefore it is especially suitable for the ultra-high-speed target detection. Meanwhile, because the correlator＇ s output is in the form of amplitude modulation in the frequency domain, MTD （Moving target detection） is also made in this radar without any additional step. The simulated results prove the validity and practicability of the proposed radar system.