基于矢量合成的相干信号干涉仪测向模型

Direction Finding Model for Coherent Multi-signals by Interferometer Based on Vectors Composition

基于通道间相位差测量的传统干涉仪测向模型在对相干多信号进行测向时会产生较大的误差,甚至测向失效,在分析其失效原因的基础上,利用相干多信号矢量合成方法,根据干涉仪基线几何结构,构建了新的相干信号干涉仪测向模型,并详细讨论了模型的求解过程。该模型不仅能够对相干多信号实施测向,而且通过对求解结果的分析可推断产生相干效应的信号个数,也能实现对传统单信号的测向,即具有较好的向下兼容性。最后通过仿真验证了模型的有效性,从而为干涉仪测向理论的发展和抗干扰应用提供了重要参考。

The conventional direction finding model by interferometer is based on the phase difference measurement among its channels. When it is used for the coherent multi-signals, there are huge errors and even failure sometimes. After the reason is given for this problem, the direction finding novel model for coherent multi-signals by interferometer is established for geometric configuration of its baselines, utilizing the method of vectors composition. Then the resolving method is discussed in detail. Not only the direction of coherent multi-signals can be found, and the number of signals is deduced by the result analysis, but also it is feasible for the single signal. Its compatibility downward is good for the conventional processing. The validity of this model is demonstrated by the simulations in the end. It is important for the development of direction finding theory and anti-jamming application of the interferometer.