Adaptive processing technique for enhanced CFAR detecting performance in active sonar systems

Active sonar systems are faced with the difficult task of detecting moving targets in strong reverberation environments. Since the effective whitening of the reverberation cannot be accomplished with a fixed notch filter, a filter structure to recover target signals obscured by the reverberation is proposed. The proposed scheme consists of an adaptive filter and a fixed filter. The optimum and suboptimum solutions are also considered. Numerical experiments for a shallow-water active sonar system are performed to examine the potential of the proposed structure for target signal enhancement problems.