Evaluation of transmit diversity in MIMO-radar direction finding
Evaluation of transmit diversity in MIMO-radar direction finding
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DOI：
10.1109/tsp.2007.893220
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发表时间：
2007-05-01
影响因子：
5.4
通讯作者：
Valenzuela, Reinaldo A.
中科院分区：
文献类型：
--
作者：
Lehmann, Nikolaus H.;Fishler, Eran;Valenzuela, Reinaldo A.
最近的研究表明，与单天线系统相比，多输入多输出（MIMO）天线系统有可能显着提高通信系统的性能。与波束成形不同的是，波束成形假定阵列发送或接收的信号之间存在高度相关性，而 MIMO 概念则利用阵列元件处的信号之间的独立性。在传统雷达中，目标的雷达截面（RCS）波动被视为降低雷达性能的干扰参数。 MIMO 雷达的新颖之处在于它提供了克服这些退化的措施，甚至可以将 RCS 波动用于新的应用。本文探讨了发射分集如何利用接收器处的天线阵列来提高雷达的测向性能。为了利用分集，发射天线必须广泛分开，而为了测向，接收天线必须紧密间隔。通过评估方位估计的几个 Cramer-Rao 界限和最大似然估计的均方误差来进行分析。
It has been recently shown that multiple-input multiple-output (MIMO) antenna systems have the potential to dramatically improve the performance of communication systems over single antenna systems. Unlike beamforming, which presumes a high correlation between signals either transmitted or received by an array, the MIMO concept exploits the independence between signals at the array elements. In conventional radar, the target's radar cross section (RCS) fluctuations are regarded as a nuisance parameter that degrades radar performance. The novelty of MIMO radar is that it provides measures to overcome those degradations or even utilizes the RCS fluctuations for new applications. This paper explores how transmit diversity can improve the direction finding performance of a radar utilizing an antenna array at the receiver. To harness diversity, the transmit antennas have to be widely separated, while for direction finding, the receive antennas have to be closely spaced. The analysis is carried out by evaluating several Cramer-Rao bounds for bearing estimation and the mean square error of the maximum likelihood estimate.