ISAR成象中包絡(luò)對齊的幅度相關(guān)全局最優(yōu)法
GLOBAL OPTIMUM METHOD FOR MOTION COMPENSATION IN ISAR IMAGERY
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摘要: 在ISAR成象運(yùn)動補(bǔ)償過程中,運(yùn)用幅度相關(guān)法進(jìn)行包絡(luò)對齊時,以相鄰的回波作為包絡(luò)對齊的基準(zhǔn),無法避免由于誤差積累帶來的漂移誤差以及由于嚴(yán)重的閃爍現(xiàn)象帶來的突跳誤差。這些誤差可以大到幾個距離單元的長度。本文提出全局最優(yōu)法,考慮某次回波的偏移量時,不只依據(jù)鄰近的一次回波,而以整個觀測期的回波為依據(jù),從而避免了常規(guī)幅度相關(guān)法的漂移誤差和突跳誤差,提高了包絡(luò)對齊的精度,減小了包絡(luò)對齊時包絡(luò)位置的漂移和突跳現(xiàn)象,改善了ISAR成象質(zhì)量。對實(shí)測數(shù)據(jù)的處理結(jié)果清楚地表明,與常規(guī)方法相比,本方法具有明顯的優(yōu)越性。Abstract: A method finding the global optimum value of misalignment is presented.It is used to increase the accuracy of range alignment.There exist the drift and jump erros when use the classical amplitude correlation method to aling the envelope of the echoes.Sometimes,these errors are so great that they are as large as the sidth of several range bins.So the quality of image is badly affected.By usign global optimum method,the range alignment is more accurate,teh drift and jump phenomena of echo envelope are decreased and the quality of the image is improved.Form the image result of real measured data,it can be seen that this method is much better than the classical method.
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保錚,等.ISAR成象處理中的一種運(yùn)動補(bǔ)償方法.電子學(xué)報,1992, 20(6): 1-6.[2]Bao Z, et al. Improvement of autofocus techniques for ISAR motion compensation. Chinese Journal of Electronics, 1995, 4(4): 1-8.[3]Steinberg B D. Radar imaging from a distorted array: The radio camera algorithm and experiment. IEEE Trans. on AP, 1981, AP-29(5): 740-748.[4]Chen C C, et al. Target-motion-induced radar imaging. IEEE Trans. AES, 1980, AES-16(1): 2-14. -
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