TEMPLATE MATCHING IN PASSIVE SONAR RECOGNITION

Passive sonar records the sound radiated by a target. A signal corresponding to a vessel is called a frequency track. A single noise source typically produces several frequency tracks, which collectively form a harmonic set. Often, there are several detectable harmonic sets, and so a key problem in passive sonar is to group the frequency tracks into their corresponding harmonic sets. This paper describes a novel method of identifying the different harmonic sets using a combination of data fitting and template matching.