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Range-instantaneous doppler imaging of inverse synthetic aperture sonar

声学技术 2003年第Z1期22卷 48-51页

作者： XU Jia~(1,2), JIANG Xingzhou~(1), TANG Jingsong~(1) (1. Navy Engineering University, Wuhan 430033, China 2. Department of Electronic Engineering, Beijing 100080, China) Navy Engineering University Wuhan 430033 China Department of Electronic Engineering Beijing 100080 China Navy Engineering University Wuhan 430033 China

Because the existing range-doppler algorithm in inverse synthetic aperture sonar (ISAS) is based on target model of uniform motion, it may be invalidated for maneuvering targets due to the time-varying changes of both individual scatter′s doppler and imaging projection plane. To resolve the problem, a new range-instantaneous doppler imaging method is proposed for imaging maneuvering targets based on time-frequency analysis. The proposed approach is verified using real underwater acoustic data.

关键词： inverse synthetic aperture sonar (ISAS), range-instantaneous doppler, maneuvering target, time-frequency analysis

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Performance analysis of acceleration resolution for radar signal

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Science China(Technological Sciences) 2003年第5期46卷 449-458页

作者： ZHAO Hongzhong (赵宏钟) FU Qiang (付强) Key Laboratory of ATR National University of Defence Technology Changsha 410073 China Key Laboratory of ATR National University of Defence Technology Changsha 410073 China

The high acceleration of moving targets has brought severe problems in radar signal processing, such as the decrease in output signal-noise-ratio and the deterioration of doppler resolution. This paper presents an acceleration ambiguity function (AAF) for characterizing the acceleration effects and the acceleration resolution property in radar signal processing. The definition of the acceleration resolution based on AAF is also presented. Using AAF as an analyzing tool, some factors are derived including the loss factor of output SNR, the broadening factor of doppler resolution, and the optimal accumulative time (OPT) caused by acceleration in linear-phase matched filtering. The convergent property of quadratic-phase matched-filter for searching for and estimating the acceleration is discussed. The results and conclusions are helpful for the quantitative analysis of the acceleration effects on signal processing, and for evaluation of the performance of acceleration in radar signal waveform design.

关键词： acceleration, doppler, ambiguity function, resolution.

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