宽带LFM信号去斜率数字脉压方法性能分析

在宽带LFM信号数字脉压中,去斜率数字脉压方法能有效地降低采样率,但是受到目标回波信号与参考信号的时延差的限制,只能作局部脉压处理。同时目标回波信号与参考信号的时延差和目标多普勒频率的变化,对去斜率数字脉压结果有一定的影响。该文通过理论分析和较全面的仿真,定量地分析了去斜率数字脉压中目标回波信号与参考信号时延差和多普勒频率的变化对数字脉压性能的影响,为工程应用中合理选择信号带宽、采样率和目标回波信号的时延提供了参考。

Performance Analysis of Digital Pulse Compression in Dechirp Methods for Wideband LFM Signals

The pulse compression in dechirp way for Wideband LFM signals can effectively decrease sampling frequency, which is only valid specifically for some pulse compression by the limit of the delay between target and reference point. At the same time, the result is influenced by the delay between target and reference point and Doppler frequency. This paper analyses the influences on the performance of pulse compression by the delay between target and reference point and Doppler frequency theoretically and simulatively. The simulation results in several conditions give references to select signal bandwidth, sampling frequency and the delay between target and reference point in engineering applications.