Simulation of the effect of secondary Doppler modulation for air targets with a turbojet engine

Abstract

The paper analyzes various approaches to modeling the effect of secondary Doppler modulation for turbojet engines. The issue of studying the conditions for the appearance of the effect of secondary Doppler modulation of the sounding signal of onboard radar stations for the further formation of the base of standards for the detection and recognition of air targets with reduced radar signature is considered. The results of modeling this effect based on ray approximation in the MATLAB environment are presented using the example of the situation of reflection of an electromagnetic wave from the blades of the first stage of a low-pressure compressor of a hypothetical turbojet engine. The stages of modeling the process of propagation of an electromagnetic wave from a radar station to a target and back, as well as “collecting” rays in the receiver antenna and forming a reflected signal with subsequent spectral analysis are described.