High-resolution Array Direction Finding Algorithm

Compared with the traditional interferometer direction finding (DF) technology, the advantage of array DF technology is that we can deal with multiple signals at the same time. The resolution of array DF technology has been urgently improved. And those algorithms which based on subspace divided technology are representative of the super-resolution algorithms. The biggest problem in an actual array DF system is the complexity of algorithms, including the time complexity and space complexity. Because the searching process in MUSIC algorithm can not meet the requirements of real-time systems, the rapid DF algorithms of search-free are the greatest possibleto be used in practical applications. As the rapid development of signal processing technology, wideband signal DF technology has also become one of the current research focuses. Based on the work of our predecessors, those problems have been studied in this paper, such as the resolution of peak-searching algorithms, the accuracy of rapid DF algorithms and the experiment of wideband signal DF algorithm. The main contents of this paper are as follows:(1) First, we give the data model and system processes of DF algorihtm based on subspace divided and analysis on the definition of resolution in peak-searching DF algorithms, summarize the key factors impact on the resolution of DF algorithms and their representativeness algorithms, and propose some improved array DF algorithms based on the analysis result of resolution key factors. Theoretical analysis and computer simulations show that the algorithm can greatly increase the resolution of array DF technology.(2) We analysis and compare the performance of some common DF algorithms based on L-shape array, summarize the advantages and disadvantages in those algorithms. And we propose an improved algorithm based on two L-shape arrays, which could solve the problem of azimuth estimated failure, improve the DF accuracy in particular direction-of-arrival, work in wide-airspace and get better accuracy.(3) We study the wideband signal array DF technology in practical application. Based on the theoretical algorithm, we experiment the wideband signal array DF technology in a semi-kind simulation environment, which could provide a practical application for reference.