高分辨率雷达中带宽对信号检测影响的研究

The Impact of Bandwidth on Target Detection in High Resolution Radar

利用单脉冲单元平均恒虚警(CA-CFAR)滑窗检测方法,对不同波段高分辨率雷达(VHF和L波段)的实测数据进行了目标检测仿真,并分析了雷达绝对带宽与相对带宽对信号检测的影响。结果表明,波段选择对信号检测影响较小,绝对带宽对信号检测影响较大。检测概率为90%时,带宽25MHz和200MHz的所需输入信噪比相差5dB。在能量一定的情况下,高分辨率雷达的检测性能优于低分辨率雷达。

The detection performance with high resolution radar （HRR） is of great importance for target recognition and imaging. This work addresses the problem of target detection using different bands （VHF and L） with different bandwidths. Single - pulse and non-coherent integration methods are used. The impact of both frequency band and the waveform bandwidth on HRR target detection is analyzed. Simulation results demonstrate that the radar bandwidth performs much more important roles than the frequency band. With the detection probability of 90%, bandwidth 25MHz and bandwidth 200MHz comparing, and the required inputting signal-to-noise ratio （SNR） differs 5dB. It is also shown that, with equivalent total energy, detection performance of the HRR is superior to eonvefitional LRR.