A digital time correlative accumulation (Ⅲ)——The anti-multipath ability

The multipath effect is strong in shallow-water acoustical channel. This paper discusses especially this problem.
The statistic characteristics of multipath in shallow-water are first described, then the anti-mu-ltipath ability in the auto-correlative and cross-correlative accumulation systems are analysed, The detection probability taking multiphath into acount are estimated. Theoretical estimations and experiments in site for some sonar systems have proved that both the auto-correlative and the cross-correlative accumulation have a high anti-mukipath ability and even make the multipath energy useful.