Method and apparatus for approximating propagation delay for use

Details Method and apparatus for approximating propagation delay for use Method and apparatus for approximating propagation delay for use

1995-10-03

1997-07-01

Olms, Douglas W.

Multiplex communications

Communication over free space

Repeater

455 132, 342357, H04J 306

Patent

active

056445725

ABSTRACT:
A subscriber unit (30) operates in a synchronous communication system having dynamic nodes such as satellites (12). Satellites (12) employ a strict transmit and receive time window and all transmissions directed to satellites (12) must fall within the receive window to be recognized. In a dynamic communication system where low earth orbit satellites (12) continuously orbit, propagation timing between a satellite (12) and a subscriber unit (30) vary rapidly over a wide range. Subscriber unit (30) must approximate a transmit timing advance for use in inaugurating a transmission to satellite (12). Subscriber unit (30) utilizes a valid geolocation position when available but when a position is unavailable or stale, relies on configuration characteristics of the constellation for generating an initial approximation of propagation delay.

REFERENCES:
patent: 4901368 (1990-02-01), Arnold et al.
patent: 5446465 (1995-08-01), Diefer et al.
patent: 5471648 (1995-11-01), Gourgue

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