Direction finding method for two dimensional plane annular array

The invention discloses a direction finding method for a two dimensional plane annular array, which is used for solving the problem of big array direction finding errors caused by the fact that an angle estimation model and an object are positioned in different partial positions The direction finding method comprises steps of calculating an azimuth of each array element in the array to obtain an azimuth sequence, obtaining a distance difference vector of a radiation source object distance array and a reference array element, successively choosing each array element as a temporary reference array element, performing respective azimuth pre-estimation on the radiation source object, performing precision estimation on the object azimuth to obtain an azimuth precision estimation value, and performing precision estimation on an object pitch angle to obtain precision estimation value of the pitch angle. The direction finding method disclosed by the invention effectively utilizes the optimal reference array element to realize the precision direction finding of the object signal according to the spatial position where the object is positioned, reduces the angle estimation error caused by the angle definition and the different spatial positions of the estimation model and the object, and improves the angle estimation performance of an omni-directional object.