Instantaneous Frequency and AOA Estimation of Multicomponent Signals Based on Choi-Williams Distribution

Abstract

In order to detect the angle-of-arrival(AOA) and the instantaneous frequency(IF) of spatial multi-component signals rapidly and effectively, an estimation approach of the spatial signal's AOA and IF is proposed using a kind of typical Cohen type time-frequency distribution Choi-Williams distribution(CWD). The method is realized by the comparison of the instantaneous frequency of the signal at the same moment using digital signal processing(DSP) based on the spatial sample of multi-component signals by the array antenna. Simulation results show that the method not only has a higher noise performance, but also improves the real-time performance of detection.