Out‐of‐band emission modelling of high‐power pulse linear frequency modulation radar

Abstract

An out-of-band (OoB) emission modelling of high-power pulse linear frequency modulation (PLFM) radar is proposed in this study. Aiming at the frequency-domain characteristic of the OoB emission, the analytical expression of the frequency-domain model by simplifying the Fresnel integral is presented. And in consideration of the time-domain characteristic of the OoB emission, the bandpass time-domain analytical model is presented. Furthermore, the frequency-domain model is improved by introducing the characteristic of transition time appeared at the rising and falling edges, and the time-domain model is improved by introducing the characteristic of frequency transition band appeared at the junction of the pass-band and stop-band of the bandpass filter. The simulation and experimental results confirm that the proposed model can accurately describe the time- and frequency-domain characteristics of the OoB emission of PLFM radar. It can be used for the time- and frequency-domain interference mechanism analysis, and guide the analysis on interference suppression demand and research on interference suppression method of the time and frequency domains.