Effect of target motion on PTFM waveform and subsequent signal processing

Abstract

In active detection, the Doppler of moving target leads to frequency shift of active echo signal, which is reflected in time dimension as time delay of echo. Due to the good resistance of PTFM (pulse train of frequency modulated) to the time-domain fading characteristics of ocean channel, it is widely used. PTFM is composed of multiple LFM, and the Doppler motion has a complex influence on it. Many scholars simply think that the interval of LFM echo in the moving target is still the pulse width T, but in fact it has changed. This paper gives the influence of Doppler motion on signal quantitatively through formula derivation, and gives the subsequent signal processing method, which has good application value for engineering application.