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arXiv 1202.0055cs.ITmath.ITstat.AP
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非相参MIMO雷达系统动目标参数估计

Moving Target Parameters Estimation in Non-Coherent MIMO Radar Systems

Aboulnasr Hassanien, Sergiy A. Vorobyov, Alex B. Gershman

摘要:

研究了多输入多输出(MIMO)雷达中运动目标参数的估计问题,提出了一种利用多输入多输出(MIMO)雷达各收发通道的相位信息估计运动目标参数的新方法。这种技术要求不同的接收天线具有相同的时间基准,但是不需要接收天线的初始相位的同步,因此,估计过程是非相干的。我们在一定的处理间隔内的目标运动建模为一般顺序的多项式。这种多项式的前三个系数分别对应于目标的初始位置、速度和加速度。提出了一种新的估计目标运动系数的最大似然(ML)方法。结果表明,所考虑的ML问题可以解释为经典的“超定”非线性最小二乘问题。建议的ML估计需要多维搜索的未知多项式系数。提出的参数估计问题的Cramér-Rao界(CRB)的推导。仿真结果验证了所提出的估计器的性能,并示出实现CRB。

英文摘要:

The problem of estimating the parameters of a moving target in multiple-input multiple-output (MIMO) radar is considered and a new approach for estimating the moving target parameters by making use of the phase information associated with each transmit-receive path is introduced. It is required for this technique that different receive antennas have the same time reference, but no synchronization of initial phases of the receive antennas is needed and, therefore, the estimation process is non-coherent. We model the target motion within a certain processing interval as a polynomial of general order. The first three coefficients of such a polynomial correspond to the initial location, velocity, and acceleration of the target, respectively. A new maximum likelihood (ML) technique for estimating the target motion coefficients is developed. It is shown that the considered ML problem can be interpreted as the classic "overdetermined" nonlinear least-squares problem. The proposed ML estimator requires multi-dimensional search over the unknown polynomial coefficients. The Cramér-Rao Bound (CRB) for the proposed parameter estimation problem is derived. The performance of the proposed estimator is validated by simulation results and is shown to achieve the CRB.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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