Method of migration compensation in coherent integration for digital TV based passive radar

Increasing integration time is the main approach to improve performance of digital TV based passive radar, but the range and Doppler migration caused by velocity and acceleration of the targets restrict the coherent integration time. This paper presents the echo signal model of the moving targets in uniform acceleration for passive radar, and analyzes the influence of velocity and acceleration, and then proposes a new migration compensation algorithm based on envelope interpolation and fractional Fourier transform for digital TV based passive radar. Simulation results show that the proposed algorithm can efficiently compensate the range and Doppler migration caused by long integration time and moving targets, and the coherent integration gain is improved, so the constraint of integration time limited by velocity and acceleration is removed.