Technique for measuring channel delay

Details Technique for measuring channel delay Technique for measuring channel delay

1991-12-06

1994-01-18

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 121, 455 674, 455 676, 375110, H04B 700

Patent

active

052806294

ABSTRACT:
A method for measuring channel delay measures the delay for a message to propagate from a prime site (100, 400) to a remote 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 message including T1. Upon receiving the message, the remote site simultaneously determines T2. The remote site decodes the message to determine T1, and then determines the delay based on the difference between T2 and T1.

REFERENCES:
patent: 3128465 (1964-04-01), Brilliant
patent: 4709402 (1987-11-01), Akerberg
patent: 4882739 (1989-11-01), Potash et al.
patent: 5070537 (1991-12-01), Ohira et al.
patent: 5105439 (1992-04-01), Bennett et al.

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