The algorithm of phase gradient autofocus(PGA) for stripmap SAR proposed by Douglas and Janes has some defects in estimating phase error precisely in the real data.Because Douglas and Janes’autofocus method does not completely select power-point object for estimating the phase error,and does not use self-adaptive weighting.In this paper,three methods used to improve the DJ_PGA algorithm are introduced in detail.All these make extend-ing PGA algorithm for more powerful adaptability.The emulational experiment...
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