基于內(nèi)定標(biāo)信號的合成孔徑雷達(dá)系統(tǒng)幅相誤差的提取和校正
Extraction and Correction of SAR Amplitude and Phase Errors Based on Internal Calibration Signal
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摘要: 該文根據(jù)合成孔徑雷達(dá)的三路定標(biāo)設(shè)計(jì)，提出了基于內(nèi)定標(biāo)信號的收發(fā)系統(tǒng)幅相誤差的提取和校正方案。與從雷達(dá)回波數(shù)據(jù)中提取系統(tǒng)相位誤差的方法相比，該方案具有兩方面的優(yōu)越性：提取誤差不受地物特性的限制，使用方便；不但可以提取相位誤差，還可以提取系統(tǒng)幅度誤差。經(jīng)驗(yàn)證該方案能大大改善圖像質(zhì)量。
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關(guān)鍵詞:
- 合成孔徑雷達(dá);幅相誤差;內(nèi)定標(biāo)
Abstract: Based on the design of three-path calibrator of SAR, this paper proposes one solution of obtaining system errors information from internal calibrator signal to correct the received SAR data in frequency domain. Compared with the methodology of extracting system phase errors from SAR echo data, the method addressed in this paper has two advantages: it is convenient to use since it is independent of ground objects; it can extract system phase errors as well as amplitude errors. Experimental results indicate that the method is very effective to improve image quality. -
朱國富，董臻，常文革，梁甸農(nóng). 用相位梯度法校正超寬帶雷達(dá)系統(tǒng)的相位誤差. 國防科技大學(xué)學(xué)報(bào)，2001，23(1): 48-50.[2]張澄波. 綜合孔徑雷達(dá)原理、系統(tǒng)分析及應(yīng)用. 北京: 科學(xué)出版社, 1989: 140 153, 163-178.[3]丁赤飚，彭海良，彭江萍. 合成孔徑雷達(dá)輻射校正(定標(biāo))技術(shù)概述. 中國科學(xué)院電子學(xué)研究所, 現(xiàn)代信息技術(shù)研究室, 內(nèi)部資料, 1998.[4]Freeman A, Alves M, ChapmaZn B, et al.. SIR-C data quality and calibration result. IEEE Trans. on GRS, 1995, 33(4): 848-857.[5]Zink M, Bamler R. X-SAR radiometric calibration and data quality. IEEE Trans. on GRS, 1995, 33(4): 840-847.[6]Ahmed S, Warren H R, Symonds M D, Cox R P. The radarsat system. IEEE Trans. on GRS, 1990, 28(4): 598-602. -
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