Importance

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Abstract

An acoustic sensor system for the detection, location and classification of sound-generating targets, such as helicopters, from a ship includes a base station aboard the ship, having a radio transmitter/receiver (B-Tx/Rx) and a digital signal processor unit (DSP). A plurality of floating remote stations, which in use are positioned remotely from the ship, are each arranged to carry apparatus including an electrical power source, a radio transmitter/receiver (STx/Rx) suitable for two way communication with the B-Tx/Rx, a control unit, sound detectors, and a data processor (DP). The control unit is responsive to signals transmitted from the B-Tx/Rx and received by the S-Tx/Rx for controlling provision of electrical power for the apparatus. The DP is operative to classify electrical signals generated by the sound detectors in response to the reception thereby of sound signals, and to initiate, dependent upon classification, transmission of data from the S-Tx/Rx to the B-Tx/Rx appertaining to the sound signals. The DSP is operative, dependent upon reception of these signals from each of the remote stations, to generate data derived therefrom appertaining to the position and classification of the sound source.

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First Claim