摘要
针对指数加权积累相关包络对齐中权值确定问题和运算量,分别提出了一种确定最优指数加权方法和递归计算积累相关方法。其中最优指数加权方法主要利用相邻脉冲回波之间相关性较强,而相隔越远的脉冲回波间相关性越弱的特点,按积累相关脉冲与待对齐脉冲之间相隔的"远近"原则赋予不同的权值,从而提高包络对齐精度和成像质量。而递归计算积累相关方法,则是充分利用积累相关处理中脉冲间内在关系导出的一种高效计算方法。理论分析、仿真和实际采集数据实验结果均表明了所提方法的有效性。
Aimed at the problem of determinating weighting and calculation,a method of ascertaining the optimum exponential weighting in the envelope alignment and a recursion algorithm is proposed.The method mainly makes use of the characteristics of strong pertinence between two near pulses and weak pertinence between two far pulses.According to the ＂far-near＂ principle between the accumulation correlation pulses and the pulses to be aligned,different weightings are endowed to different pulses.The efficient recursion algorithm in accumulation correlation computing is deduced by making full use of the interior relationship between pulses.By theoretic analysis,simulations and actual sampling data it is proved that the proposed method is effective.
出处
《雷达科学与技术》
2010年第6期532-537,542,共7页
Radar Science and Technology
关键词
指数加权
包络对齐
积累相关
递归算法
逆合成孔径雷达
exponential weighting
envelope alignment
accumulation correlation
recursion algorithm
inverse synthetic aperture radar（ISAR）
