针对多通道测向系统存在系统复杂度高且测向精度受幅相不一致的影响以及虚拟变换阵列单通道空间谱估计时矩阵求逆运算量大的问题,提出了基于时间调制阵列的单通道测向估计方法.该方法利用时间调制阵列的谐波特性,周期性地打开天线阵列的各个单元通道,通过对接收信号的谐波分量进行测量来实现波达方向估计.该方法的计算量主要集中于谐波分量的谱估计,可通过经典的离散傅里叶变换在数字域内实现.仿真实验证明,该方法正确、有效,且实现过程可用于指导低成本和低复杂度的测向系统的实现.%Based on the harmonic characteristic generated by time modulated array,a novel single channel direction of arrival (DOA) method was proposed,which could be used to solve the high complexity and the precision affected by amplitude-phase-inconsistency in the multichannel system and the large computation caused by matrix inversion of spatial spectrum estimation in the single channel system of virtual transformation array.The principle was through opening the element of antenna array periodically,the direction of arrival could be obtained by measuring the generated harmonic components of received RF signal.The main calculation for the proposed method concentrates on the spectrum estimation of harmonic components,which could be acquired by classic discrete Fourier transform (DFT) in digital domain.Numeric simulation was provided to prove the effectiveness and correction of the proposed method.The process can be used to guide the realization of low-cost and low-complexity direction finding system.
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