Technique for measuring channel delay

Details Technique for measuring channel delay Technique for measuring channel delay

G - Physics

01

R

G01R 29/00 (2006.01) H04H 20/67 (2009.01) H04B 17/00 (2006.01) H04J 3/06 (2006.01) H04H 3/00 (2006.01)

Patent

CA 2100446

A method for measuring channel delay measures the delay for a message to propagate from a prime site (100, 400) to a re- mote site (200, 500) via the channel (300, 600). The prime site includes a clock for providing a first value, T1, based on the current time at the prime site. The remote site includes a clock for providing a second value, T2, based on the current time at the remote site. Both clocks are synchronized with a common timing source, such as a GPS satellite timing signal. Therefore, T2 equals T1. In one embodiment, the prime site determines T1, and simultaneously sends a message to the remote site via the channel, the mes- sage including T1. Upon receiving the message, the remote site simultaneously determines T2. The remote site decodes the mes- sage to determine T1, and then determines the delay based on the difference between T2 and T1.

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