Analysis on Signal Transmission Methods for Rapid Searching in Active SONAR Systems

摘要

Pulse repetition interval (PRI) based transmission is a basic method used in radar and sonar systems to search and detect a target but it takes a long time to fully search target area because only one beam is transmitted in a PRI. In order to shorten the search time, other methods are required that can transmit signals of all beams in one PRI. There are two basic transmission methods designed by considering this requirement. One is a divided pulse length (PL) based transmission method which sequentially generates signal of each beam. The other is a multi-frequency based transmission method which generates orthogonal signals of all beams simultaneously. We analyzed the characteristics and the performance of the two transmission methods by simulations considering the underwater reverberant environment and maneuvers of a moving vehicle.