数字合成孔径雷达中改善I/Q通道不平衡性的多相Kaiser滤波法

黄广民; 高祥武; 杨汝良

数字合成孔径雷达中改善I/Q通道不平衡性的多相Kaiser滤波法

黄广民^{①②;高祥武},
高祥武,
杨汝良

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出版历程
- 收稿日期: 2002-11-12
- 修回日期: 2003-03-25
- 刊出日期: 2004-03-19

Polyphase Kaiser Filter for the Correction of I/Q Imbalance of Digital Synthetic Aperture Radar

摘要

摘要: 该文分析了数字合成孔径雷达正交相干检波的I,Q通道的不平衡性,给出了评价I/Q通道不平衡性的统一指标。为了改善数字合成孔径雷达I/Q通道的不平衡性,该文采用了一种新的方法内插多相Kaiser滤波法.研究表明,当多相Kaiser滤波器的阶数为16时,噪声旁瓣的抑制比为-74dB,相对瞬时频率误差为-1.18％。
- 数字合成孔径雷达; 相干检波; 滤波器
Abstract: The principle of the quadrature coherent detector of the digital Synthetic Aperture Radar (SAR) is introduced in the paper. The imbalance of its I/Q is analyzed, and the uniform index of its imbalance is presented. For the correction of the digital SAR I/Q imbalance, the paper adopts a new method-interpolation polyphase Kaiser filter. The results show that when the stage of the polyphase Kaiser filter is 16 the ratio of sidelobe suppression is -74dB, and the relative instant frequency error is -1.18%.

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参考文献(1)

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