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Sonar location monitor

  • US 6,327,220 B1
  • Filed: 09/15/1999
  • Issued: 12/04/2001
  • Est. Priority Date: 09/15/1999
  • Status: Expired due to Fees
First Claim
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1. A low frequency SONAR surveillance system for tracking the location of swimmers who may be in danger comprising:

  • a means for detecting potential or actual swimmer distress for each swimmer equipped with an individual SONAR Swimmer Location Monitor (SSLM) wherein said means triggers a pulsed low frequency sonic or ultrasonic, or combination thereof, alarm transmission when specified thresholds monitored by said SSLM and which indicate potential or actual swimmer distress are exceeded;

    a means for generating sonic, ultrasonic, or combination thereof, waves through the water from a transducer (pinger) contained in the SSLM to transmit said alarm transmission to position remote from the swimmer;

    a means remotely located from the swimmer for receiving said sonic, ultrasonic, or combination thereof, alarm transmission using an array of hydrophones;

    a means for amplifying, filtering and processing the received sonic, ultrasonic, or combination thereof, alarm transmission to track the distressed swimmer'"'"'s location; and

    a means for triggering an audible alarm whenever said specified thresholds are exceeded.

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