Method for time drift reduction of frequency hopping network clo

Details Method for time drift reduction of frequency hopping network clo Method for time drift reduction of frequency hopping network clo

1994-08-24

1996-05-21

Chin, Shephen

Pulse or digital communications

Repeaters

Testing

375356, 455 511, H04B 1500

Patent

active

055197175

ABSTRACT:
This invention provides a method for substantially reducing the time drift f a network clock in a frequency hopping communications system, without the need for a master unit to keep network time. The automatic network time tracking mechanism of each receiver is disabled when a network time update is received within a critical period of time from the closest synchronization update time or frequency hop time. The critical period is defined as the time between the closest synchronization update time to the local time when reception occurs less one-half the minimum tracking adjustment of the receiver plus the minimum processing or decoding delay, and that closest synchronization update time plus one half the minimum tracking adjustment of the receiver plus the maximum processing or decoding delay.

REFERENCES:
patent: 4677617 (1987-06-01), O'Connor et al.
patent: 5121408 (1992-06-01), Cai et al.
patent: 5394433 (1995-02-01), Bantz et al.
patent: 5414731 (1995-05-01), Antunes et al.

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