Torpedo homing beam sharpening method

The invention relates to a torpedo homing beam sharpening method which can effectively improve resolving capability of a torpedo on a plurality of targets in different positions in space. The method is characterized by aiming at a torpedo homing acoustic base array. Through selecting different weighting coefficients for array element received signals of the base array to perform weighted summation, two wave beams are formed on the same direction in the space at the same time, and one beam is narrow in main lobe and high in side lobe, and the other beam is wide in main lobe and low in side lobe, respectively realizing to reduce beam main lobe and restrain beam side lobe. A combined processing of weighting corresponding products by using the two beam signals with different main lobe and side lobe characteristics and envelope, and the side lobe is recued while further sharpening the beam main lobe, so as to obtain a sharpened beam signal with low side lobe, thereby improving position resolving capability of the beam. The method is low in calculated amount, good in robustness, and good in adaptation capability. The method is especially suitable to be used in application environment where the number of space signal sources is unknown or each signal source has relatively strong correlation. The method has good engineering practicality, and can improve multi-target spatial position resolving capability of a torpedo.