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Performance Analysis of the Heterodyne Correlator Detector for Active Sonar Detection

The heterodyne correlator detector is a computationally efficient implementation of the matched filter detector for narrow band active sonar waveforms. It is the common choice for signal detection systems when real time requirements are to be met with limited hardware resources. This paper presents an analysis of the performance bounds of the heterodyne correlator as compared to optimum match filtering. The detection threshold of a heterodyne correlator detector is arrived at from the analysis and validated by simulations. The losses due to the signal overlap mismatch which is inevitable in practical implementation of such systems are also presented.