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运动补偿是逆合成孔径雷达(ISAR)成像的关键技术.现有的将运动补偿分成包络对齐和初相校正2步处理的算法存在补偿精度低的缺点.针对这一问题,提出了一种基于早迟卷积的运动补偿算法,其思想来源于扩频通信系统中早迟门型比特同步电路.算法能精确估计每个脉冲时刻目标的位置,在精确对齐包络的同时,对回波相位作初步校正.该算法对各脉冲回波一维距离包络单独处理,不存在误差积累的问题.距离估计精度不受距离分辨单元大小限制,不存在量化误差.
Motion compensation is the key technology of inverse synthetic aperture radar (ISAR) imaging.At present, the algorithm that divides motion compensation into enveloping alignment and initial phase correction has the disadvantage of low compensation accuracy.Aiming at this problem, this paper proposes a Based on the early and late convolutional motion compensation algorithm, the idea comes from the early gate type bit synchronization circuit in the spread spectrum communication system.The algorithm can accurately estimate the position of the target at each pulse, accurately align the envelope, And the phase is used as a primary correction.The algorithm solves the one-dimensional envelope of pulse echoes independently without error accumulation.The distance estimation accuracy is not limited by the size of the distance resolution unit and there is no quantization error.