Calibration Method of Array Errors for Wideband MIMO Imaging Radar Based on Multiple Prominent Targets
Calibration Method of Array Errors for Wideband MIMO Imaging Radar Based on Multiple Prominent Targets
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DOI：
10.3390/rs13152997
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Zheng Zhao;Weiming Tian;Yunkai Deng;Cheng Hu;T. Zeng
中科院分区：
文献类型：
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作者：
Zheng Zhao;Weiming Tian;Yunkai Deng;Cheng Hu;T. Zeng
宽带多输入多输出（MIMO）成像雷达可以通过特定的多天线结构实现高分辨率成像。然而，其成像性能受到阵列误差的严重影响，包括通道间误差和所有发射和接收单元（TE/RE）的位置误差。传统的校准方法只适用于窄带信号模型，无法将阵元位置误差与阵列误差分离。提出了一种基于多突出目标的宽带MIMO成像雷达阵列误差估计与补偿方法。首先，提出了一种高精度的目标位置估计方法，能够在不借助其他设备的情况下获得突出目标的位置。其次，通过求解方程约束最小二乘问题估计通道间的幅度和时延误差。在此基础上，利用遗传算法估计阵元位置误差，消除了空间变化的误差相位。最后，通过仿真和实验数据验证了该方法的可行性和正确性.
Wideband multiple-input-multiple-output (MIMO) imaging radar can achieve high-resolution imaging with a specific multi-antenna structure. However, its imaging performance is severely affected by the array errors, including the inter-channel errors and the position errors of all the transmitting and receiving elements (TEs/REs). Conventional calibration methods are suitable for the narrow-band signal model, and cannot separate the element position errors from the array errors. This paper proposes a method for estimating and compensating the array errors of wideband MIMO imaging radar based on multiple prominent targets. Firstly, a high-precision target position estimation method is proposed to acquire the prominent targets’ positions without other equipment. Secondly, the inter-channel amplitude and delay errors are estimated by solving an equation-constrained least square problem. After this, the element position errors are estimated with the genetic algorithm to eliminate the spatial-variant error phase. Finally, the feasibility and correctness of this method are validated with both simulated and experimental datasets.