NDLI: Phase imbalance compensation in SAR/ISAR quadrature demodulation

Content Provider	IEEE Xplore Digital Library
Author	Enke Liu Junfeng Wang Tao Wang
Copyright Year	2009
Description	Author affiliation: Shanghai Jiao Tong University, China (Enke Liu; Junfeng Wang) \|\| Ludong University, Geography and Planning Institute, China (Tao Wang)
Abstract	I/Q channel imbalance in quadrature demodulation is one of the major concerns in the design of synthetic aperture radar (SAR) and inverse SAR (ISAR) receivers. The amplitude and phase mismatches result in the additional mirror signal, which acts as a correlated interference superimposed on the desired signal and, hence, degrades the whole system's performance significantly. In this paper, we first analyze the effects of I/Q channels imbalance in detail, and focus on the relationship between the mirror signal and imbalance effect. Then a new digital method for phase imbalance compensation is proposed. The phase mismatch is adaptively estimated and compensated by optimizing the matched filtering results without requiring any testing signals or measurement circuits. The method is based on the principle that when the phase mismatch is compensated perfectly, the entropy of the range-resolved image will reach the minimum or the contrast will reach the maximum. In addition, the simulation results indicate that the I/Q phase mismatch can be effectively compensated during the normal operation of the SAR/ISAR receivers, even in the rapidly changing case, as long as a linear system model for the imbalance is valid.
Starting Page	459
Ending Page	463
File Size	569290
Page Count	5
File Format	PDF
ISBN	9781424427314
DOI	10.1109/APSAR.2009.5374283
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-26
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Matched Filtering Phase Mismatch Pulse Compression Adaptive filters Interference Circuit testing Degradation I/Q Imbalance System performance Phase estimation Mirrors Signal analysis Synthetic aperture radar Demodulation
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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