THE PRECISE BEARING METHOD OF DIGITAL SPLIT-BEAM ARRAY SYSTEM

摘要

＜正＞The precise bearing problem of digital split-beam sonar is described in this paper.By using theprinciple of cross power spectrum method proposed by Piersol for estimating the time delay between twosignals,the relationship between signal incidental angle and the time delay of equivalent acousticcenters of line or circle array are derived.Based on these expression,the precise value of bearing anglefor the target can be directly calculated from the input data. The accuracy of the estimates which depends on the number of accumulation,the length of DFTand the sample period is given.We have also described the error due to the truncating for randomsignal.The methods of improving the estimation accuracy,such as the weighting for estimates,win-dowing for input data and choosing the suitable parameters for DFT are given. The block diagram and a part of results of system simulation are presented.The method proposedin this paper is available in the real-time tracking of multiple targets of digital sonar.