Algorithm of signal processing with five-channel interferometer

This article primarily focus on phase ambiguity respectively on the structure of isobase and not-isobase on the direction finding system with five units circular antenna array interferometer. We have successfully improved the accuracy of direction finding by weighted processing with multi-baseline measurement datas. This paper proposes a method to choose weight coefficient and a direction finding signal processing algorithm including phase difference estimate, angle transformation, ambiguity solution and channel error correction and so on. The computer simulation results indicate that the accuracy of direction finding of two kind of structure baselines is close to each other. The greatest direction finding error is smaller than 0.1° in case of both omnidirectional range and FM band.