Patent ID: 7663535
Filing Date: 2010-02-16
Classification: G01C,G01S

Abstract:
1. A system for establishing position registration and pair-wise phase differences for a plurality of monitors in a monitor network, to prepare said monitor network for locating a beacon, said system comprising: a means at a first said monitor for transmitting a measurement signal from said first monitor to a second said monitor with known phase and signal propagation velocity; a means at said second monitor for transponding the measurement signal with a pre-identified transponder delay duration for transmission as a return signal from said second monitor to said first monitor; a means for comparing the return signal with the transmitted signal to establish a phase difference; a means for determining a separation distance between said first monitor and said second monitor using said established phase difference, said propagation velocity and said pre-identified transponder delay duration to register said first monitor relative to said second monitor; and a means at one of said first or second monitors for using said separation distance and a measurement signal from said other first or second monitors to determine a pair-wise phase difference for said first and second monitors.