摘要
编队飞行的目标 ,由于间距很小 ,常规雷达无法分辨。多普勒波束锐化 ( DBS)利用目标回波多普勒频率的差别来分辨目标 ,但需要较长的相关处理时间。在这期间 ,目标本身的多普勒频率又是变化的 ,当多普勒频率变化率较大时 ,容易产生频普的混叠。文中提出了一种基于小波变换的群目标分辨方法 ,在较短的相关处理时间中 ,利用小波变换降低信号的时间分辨率来提高频率分辨率 ,从而达到分辨群目标的目的 ,同时可以利用小波变换的去噪声能力 ,进行降噪。计算机仿真结果表明 ,在群目标多普勒频率变化率较大 ,只能减小相关处理时间降低时间分辨率时 ,常规DBS法无法分辨 ,而该方法仍然可以有效地进行分辨。
Due to the short distance between planes flying in a group,the ordinary radar can't separate them.The method of Doppler beam sharpping(DBS) use the difference among the Doppler frequency of the targets to distinguish them,but a long processing time is needed.During this while,the Doppler frequencies of the targets are changing and the spectrum of these targets are easy to arise a aliasing error when the rate of Doppler frequencies is large.In this paper,the method based on wavelet transformation is proposed to improve the spectrum distinguishing ability with the loss of time distinguishing ability.It is shown by the simulations results that the improved DBS method is effective during shorter processing time.
出处
《遥测遥控》
2000年第6期28-32,共5页
Journal of Telemetry,Tracking and Command
关键词
小波变换
+多普勒波束锐化
+群目标分辨
+频域分辨率
Wavelet transformation
Doppler beam sharpping
Unresolved targets
Spectrum distinguishing rate
