A general sequential delay-Doppler estimation scheme for sub-Nyquist pulse-Doppler radar
A general sequential delay-Doppler estimation scheme for sub-Nyquist pulse-Doppler radar
复制标题
亚奈奎斯特脉冲多普勒雷达通用顺序延迟多普勒估计方案
DOI：
10.1016/j.sigpro.2017.01.012
复制
发表时间：
2017
影响因子：
4.4
通讯作者：
Liu Zhong
中科院分区：
文献类型：
--
作者：
Chen Shengyao;Xi Feng;Liu Zhong
利用模拟-信息转换（AIC）系统对亚奈奎斯特雷达的时延和多普勒参数进行序列估计是近年来受到广泛关注的问题。然而，所报道的估计方法依赖于aic，并且对离网目标的性能较差。本文提出了一种通用的估计方案，它适用于所有的aic，无论目标是在网格上还是在网格外。该方法将时延估计转化为波束空间到达方向问题，将多普勒估计转化为线谱估计问题。然后，利用众所周知的空间和时间频谱估计技术来提供有效和高分辨率的延迟和多普勒参数估计。此外，还提供了保证离网目标估计成功的AIC充分条件，而现有条件大多与并网目标有关。理论分析和数值实验表明了该方案的有效性和正确性。
Sequential estimation of the delay and Doppler parameters for sub-Nyquist radars by analog-to-information conversion (AIC) systems has received wide attention recently. However, the estimation methods reported are AIC-dependent and have poor performance for off-grid targets. This paper develops a general estimation scheme in the sense that it is applicable to all AICs regardless whether the targets are on or off the grids. The proposed scheme estimates the delay and Doppler parameters sequentially, in which the delay estimation is formulated into a beamspace direction-of- arrival problem and the Doppler estimation is translated into a line spectrum estimation problem. Then the well-known spatial and temporal spectrum estimation techniques are used to provide efficient and high-resolution estimates of the delay and Doppler parameters. In addition, sufficient conditions on the AIC to guarantee the successful estimation of off-grid targets are provided, while the existing conditions are mostly related to the on-grid targets. Theoretical analyses and numerical experiments show the effectiveness and the correctness of the proposed scheme.