Abstract：Super resolution Algorithms can be used to obtain high resolution in ISAR imaging.But in the case of maneuvering target,the Doppler frequency of received signal scattered by target will not be constant,and these algorithms always suffer from the signal model error or fail completely when they are used in the cross range.In this paper,the first order approximate model of Doppler frequency is assumed,and an algorithm based on the extended RELAX method is proposed to estimate the parameters of chirp signals.The Cramer-Rao bounds are derived and simulation results are also present to demonstrate the performance of the algorithm.
2000, Vol. 22 
