PRF可变的星载方位向多相位中心多波束SAR
Displaced Phase Centers Multibeam in Azimuth with PRF Alterable Mode of Spaceborne Synthetic Aperture Radar (SAR)
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摘要: 方位向多相位中心多波束(DPCA)SAR可以解决测绘带宽和分辨率之间的矛盾,但严格限制了对脉冲重复频率(PRF)的选择。该文分析了方位向信号的频谱,给出了当PRF偏离理想值时均匀采样方位谱的重构方法,提出了PRF可变的DPCA模式。计算机仿真验证了新模式的正确性。Abstract: SAR with Displaced Phase Centers multibeam in Azimuth (DPCA) can solve the confliction between swath width and resolution, but this mode is one Pulse Repetition Frequency (PRF) restriction. In this paper, the spectrum of the signal in the azimuth direction is analyzed, and the reconstruction method of the uniform spectrum in azimuth is given when PRF deviated from the ideal PRF. DPCA with PRF alterable mode is introduced. The simulation of point target is used to analyze the effect of this new method.
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Currie A, Brown M A. Wide-swath SAR, IEE Proc.-F, 1992,139(6): 122- 135.[2]Papoulis A. Generalized sampling expansion. IEEE Trans. Cir.Syst., 1977, CAS-24:652 - 654.[3]Yen J L. On nonuniform sampling of bandwidth-limited signals.IRE Trans. on Circuit Theory, 1956:251 - 257.[4]Marvasti F, Analoui M, Gamshazahi M. Recovery of signals from nonunifrom samples using iterative methods[J].IEEE Trans.on Signal Processing.1991, 39:872-[5]Feichitiger H G, Grchoenig K, Stromer T. Efficient numerical methods in nonuniform sampling theory[J].Numer. Math.1995,69(4):423-[6]Jenq Y C. Perfect reconstruction of digital spectrum from nonuniformly sampled signals[J].IEEE Trans. Instrum. Meas.1997,46:649-[7]Thompson A A, Luscombe A P, James K, Fox P. New modes and techniques of the RADARSAR-2 SAR, IGARSS 2001, Sydney:485 - 487. -
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