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

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.