Range migration-based Doppler ambiguous integer estimation for moving targets with azimuth spectrum aliasing

Ying Zhang, W. Xiong, Xichao Dong, Cheng Hu, Chengxiang Liu, Yang Sun
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Abstract

In some case, the azimuth spectrum bandwidth is larger than the pulse repetition frequency (PRF), leading to a whole azimuth spectrum has been folded into multiple subsegments and aliased. Therefore, the traditional Doppler ambiguous integer estimation method cannot be used directly. In this paper, the influence of Doppler ambiguous integer on residual range migrations' slope is analyzed. Based on the slope, the Doppler ambiguous integer estimation method for moving targets with azimuth spectrum aliasing is given. From the simulation results, the Doppler ambiguous integer can be estimated accurately by proposed method.
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基于距离偏移的方位谱混叠运动目标多普勒模糊整数估计
在某些情况下,方位角频谱带宽大于脉冲重复频率(PRF),导致整个方位角频谱被折叠成多个子段并混叠。因此,传统的多普勒模糊整数估计方法不能直接使用。本文分析了多普勒模糊整数对残差偏移斜率的影响。基于斜率,给出了具有方位谱混叠的运动目标的多普勒模糊整数估计方法。仿真结果表明,该方法能准确估计多普勒模糊整数。
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