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Azimuth space-variant properties of BiSAR with nonequal velocities
Authors:Yang Yonghong  Pi Yiming
Institution:School of Electronic Engineering,Univ.of Electronic Science and Technology of China,Chengdu 610054,P.R.China
Abstract:Bistatic SAR possesses characteristic of the azimuth space-variant when the velocities of transmitter and receiver are not equal.The geometric model of BiSAR with the parallel trajectories and the nonequal platform velocities is presented.Analyzing the motion relationship of transmitter and receiver,the formula of azimuth space-variant is derived in time domain.Via Taylor polynomial expansions,the azimuth space-variant is factorized by four terms: zero-order,first-order,second-order,and third-order term.And,their impacts on impulse response are illuminated.Some characteristics about azimuth space-variant of airborne BiSAR case are exhibited by simulation experiments,arid these simulated results are coincident with the formulae of azimuth space-variant.
Keywords:bistatic SAR  range migration  azimuth space-variant  imaging formation algorithm
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