基于移动目标的DOA估计偏差校正

Eliminating DOA Estimation Bias Based on Mobile Target

针对移动目标的波达方向估计容易出现偏差的问题，提出一种利用频移信息修正方位估计偏差的算法，解决了传统方位估计算法不能适用于高速移动目标或平台的问题。该方法利用基阵平台与目标的径向移动速度，估计中心频率偏移，然后利用频移信息修正传统的方位估计结果。仿真结果表明，该算法可以极大地提高移动目标的方位估计精度。此外，该算法对阵列的阵型和方位估计算法没有任何限制，因此具有广泛的适用性和较强的工程实用价值。

For the mobile target, DOA estimation bias is difficult to avoid. So, a method that can reduce the bias of DOA estimation is presented in this paper to solve the issues that the traditional DOA estimation algorithms can not apply to high-speed moving objects or plat- form. Firstly, the central frequency shifting is estimated by using the information of radial speed between the array platform and target. Then, the frequency shifting information is used to correct the DOA estimation results of conventional method. Simulation results show that this algorithm can greatly improve the estimation accuracy of the DOA of a moving tar- get. In addition, the algorithm has no restrictions on array shape and DOA estimation algo- rithm, so it has broad applicability and practical value in engineering.