Patent ID: 7492251
Filing Date: 2009-02-17
Classification: B63C,G01S,G08B

Abstract:
1. A location system, comprising a Personal Locator Beacon (PLB), a local monitoring station (LMS) and a remote monitoring station (RMS); the PLB comprising a transmitter configured to transmit successive signals, upon activation; the LMS and the RMS configured to determine the PLB location, from data derived from said signals; the PLB further configured to: a) transmit a first group of said successive signals, upon activation, at a low transmission power and at a high repetition rate, said low transmission power configured to enable determining the PLB location at the LMS but not at the RMS; b) transmit a second group of said successive signals, after transmitting said first group of said successive signals, at a high transmission power, higher than said low transmission power, and at a low repetition rate, lower than said high repetition rate, said high transmission power configured to enable determining the PLB location at the RMS.