ISAR Imaging Base on HHT-oriented Time-Frequency Analysis

Time-frequency analysis is a powerful tool for the evaluation of non-stationary signals such as radar signal. Radar target motion causes time-dependent Doppler frequency in the received radar signal. This paper presents a new time-frequency analysis based on Hilbert Huang Transform (HHT) technique as a powerful tool for the inverse synthetic aperture radar (ISAR) imaging of aircraft. HHT is developed for nonlinear and non-stationary process which is just the characteristic of ISAR imaging. In this paper, the ISAR imaging model is given first. Then, the HHT-oriented time frequency analysis is newly proposed and discussed. Finally the simulation of ISAR imaging based on HHT-oriented time frequency analysis is conducted and the result demonstrates the power of this new method.