A broadband digital monopulse tracking signal processing method

Abstract

The application provides a broadband digital single-pulse tracking signal processing method, which comprises the following steps: acquiring a broadband baseband signal containing target information; acquiring inter-channel amplitude and phase error coefficients by using a feedback loop, constructing an equalization filter in a frequency domain, and jointly compensating the broadband amplitude-frequency characteristics and phase-frequency characteristics of each channel signal; according to a target pointing instruction, finely adjusting the time delay of each channel signal after calibration by using a fractional order time delay filter, and weighting and synthesizing a sum beam, an azimuth difference beam and an elevation difference beam; monitoring a signal spectrum in real time and identifying the azimuth of an interference source, adaptively selecting a sidelobe interference suppression strategy based on orthogonal subspace projection or a main lobe interference suppression strategy based on blocking matrix preprocessing according to the positional relationship between the interference source and the main lobe, and generating a purified sum-difference beam; determining whether the target is in a linear measurement area or a nonlinear measurement area according to the complex ratio amplitude of the sum-difference beam; and adaptively adjusting the observation parameters of a Kalman filter and updating the beam pointing.

Images