Key issue of weak moving targets detection under lower signal noise ratio is managing to enhance the target echo energy using long time coherent integration.During integration the target may migrate from one to another across radar range and Doppler resolution cells

motion compensation should be taken into consideration to improve detector's performance.Based upon dwelling mode of radar beam in phased array radar system

this paper presents a novel detection framework which using range stretching and joint time frequency processing to fight against the case where range and Doppler cells of echoes migration is presented.A possible realization diagram of such a detector is suggested and performance analysis is given.Simulation results and experiments on real data confirm the effectiveness of this method.