High-precision spatial spectrum direction finding method based on specific non-equidistant array structure

The invention discloses a high-precision spatial spectrum direction finding method based on a specific non-equal-interval array structure. The method comprises the following steps: firstly, establishing a non-equal-interval array direction finding model according to an antenna given by a general-purpose aircraft; providing two direction finding schemes for different search and rescue signal frequencies in the search and rescue system, including a multi-antenna non-equal-interval linear array direction finding scheme and a double-antenna co-prime array direction finding scheme, and determining antenna array elements in the direction finding schemes; and finally, direction finding error correction is carried out, channel amplitude and phase errors in the direction finding process are analyzed, error correction is carried out by adopting a single auxiliary information source correction algorithm, and the direction finding precision in the search and rescue process is improved. According to the invention, a high-