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提出以对称三角形耦合振荡器阵列为本振阵列,分析了耦合本振振荡器的相位控制原理,给出耦合本振阵列相位控制方法,推导了耦合本振阵列锁相同步时,形成均匀的线性相位分布,且阵元间的相移只与边界上振荡器的振荡频率有关。利用耦合本振阵列形成均匀相位分布的这一属性,调整耦合本振阵列边界上的振荡器振荡频率,改变耦合本振相邻阵元的相移,实现波达方向估计。同时对三角形耦合阵列的稳定过程、波达方向估计进行了计算机仿真,验证了理论分析结果。
Proposed a symmetrical triangular coupled oscillator array as the local oscillator array, analyzed the principle of the phase control of the coupled local oscillator, provided the phase control method of the coupled local oscillator array, and deduced that when the coupled local oscillator array is locked in phase, the uniform linearity Phase distribution, and phase shift between elements only with the oscillation frequency of the oscillator on the border. By using the property that the coupled local oscillation array forms a uniform phase distribution, the oscillator oscillation frequency at the boundary of the coupled local oscillation array is adjusted and the phase shift of the coupled local oscillators is changed to realize the DOA estimation. At the same time, the stability of triangular coupled array and the DOA estimation are simulated by computer. The results of theoretical analysis are validated.