高速目标解调频处理的相位特性及其补偿

冯德军; 王雪松; 肖顺平; 王国玉

doi:10.3724/SP.J.1146.2006.00927

高速目标解调频处理的相位特性及其补偿

doi: 10.3724/SP.J.1146.2006.00927

基金项目:

国家自然科学基金 (60672033)，新世纪优秀人才支持计划 (NCET-04-0997)和全国优秀博士论文专项资金(08100101)资助课题

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出版历程
- 收稿日期: 2006-06-26
- 修回日期: 2006-12-20
- 刊出日期: 2008-04-19

Phase Signatures and Compensating Approach to Moving Target Echoes by Dechirping Processing

摘要

摘要: 对宽带回波进行解调频(Dechirping)处理是降低信号处理带宽的有效方法，但该方法会带来残余相位。在目标高速运动的情况下，解调频处理和目标运动产生的残余相位对二维成像的影响不可忽略。该文推导了高速目标解调频处理的相位特性，分析了各项相位因子的性质，提出了残余相位的补偿方法，进一步分析了影响补偿精度的因素，并根据残余相位特性提出了一种新的补偿方法：利用包络对齐估计相邻回波的残余相位差，达到精细补偿的目的。仿真结果表明理论和方法的正确性。
- 运动目标; 解调频; 相位特性; 相位补偿
Abstract: Dechirping is an effective method for decreasing the bandwidth of input signals. For high velocity moving targets ISAR imaging, the residual phase arisen from dechirping processing and target moving can not be ignored. The theoretic model of phase signatures is derived thoroughly and the compensation methods are presented when dechirping technology is employed. In addition, the factors which influence residual phase and the precision of compensating are analyzed. According to the signatures of residual phase, a new compensation method is proposed in which the range alignment is applied to estimate the residual phase difference of adjacent echoes. Numerical simulation results illustrate the validities of proposed theories and methods.

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参考文献(1)

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