脉冲雷达回波信号检测性能比较分析

Analysis and compare on the detection performance of pulse radar echo signal

雷达脉冲回波信号在传播过程中受杂波、噪声和接收机检测电路的影响,呈现非平稳时变特点。本文针对脉冲回波信号检测的特点,研究了采用固定门限的N-P准则检测技术和门限自适应调整的CA-CFAR检测技术。分析比较了不同虚警概率下基于N-P准则的目标回波检测和在含噪声与杂波条件下设置不同的参考窗n进行CA-CFAR准则目标回波检测的性能,并开展了回波信号的检测性能比较。结果表明,CA-CFAR检测技术的性能优于N-P准则,且能够适应环境变化自适应调整检测门限。

When radar pulse echo signal is affected by its echo, noise and the detection circuit of receiver in course of target signal transmission, it has the non-stationary and time-variation characteristics. Based on the characteristic of the pulse echo signal, the N-P rule detection technique with constant threshold and the CA-CFAR detection technique with the self-adaptive threshold are studied in this paper. Their detection performance is analyzed and compared with the different false-alarm probability which is target echo signal detection by N-P rule and CA-CFAR rule with the setting of the different reference window n under the echo and noise surroundings, and the performance of both the detection techniques is simulated and compared. The result shows the performance of CA-CFAR detection technique is superior to N-P criteria detection technique, and which adjusts self-adaptively its detection threshold with the surrounding.