An all-directional interference cancelling system for large sonar array

摘要

The existence of strong interfercnce is the main constraint factor,which influences the detection performance of a signal extraction system.For asonar with large array the problem of anti-interferences in all-direction has not beensolved yet because of the requirements of over-long time delay line and the over highinput-output rate.A method proposed in this paper can be used in the design ofadaptive signal processing system with large array for suppressing the strong inter-ference in all-direction.This is a combined architecture of adaptive noise canceller(ANC)and a programmable DICANNE system.When the incident angle betweensignal θ_s and interfercnce θ_I is small,the ANC system is used.when θ_s—θ_I islarge,a programmable DICANNE system,with rising sampling rate,is used,so thatan all—directional anti—interfercnces system can be obtained.The structure des-cribed in this paper is easy to implement in hardware by using DSP chips.The designdiagram and implementable method in hardware is presented.