GPS reference clock generator

Details GPS reference clock generator GPS reference clock generator

1994-12-09

1998-02-10

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

331 73, 331158, G01S 502

Patent

active

057174024

ABSTRACT:
The GPS-disciplined clock consists of two digital phase locked loops. The first, Loop 1, tracks the crystal oscillator's third overtone vs. fundamental frequency variation with a numerical controlled oscillator, NCO1; The second digital phase locked loop, Loop 2, tracks the GPS satellite receiver's 1PPS signal vs. the crystal oscillator's frequency counter output variation with another numerical controlled oscillator, NCO2. When the satellites are in view, the embedded computer writes the two NCOs tracking record onto a memory; while the satellites are not in view, the computer directs a digital frequency synthesizer to generate frequency according to the tracking records stored in the memory. The hardware implementation of the inventive design is mostly digital, but a very-large-scale ASIC can be used to miniaturize the whole GPS-Synchronized clock system, making it a battery-powered, truly portable, and easy to be integrated into other instruments.

REFERENCES:
patent: 4740761 (1988-04-01), Barnes et al.
patent: 4849993 (1989-07-01), Johnson et al.
patent: 4872765 (1989-10-01), Schodowski
patent: 4899117 (1990-02-01), Vig
patent: 5487183 (1996-01-01), Nanni et al.
A GPS Primary Reference Clock, Microwave Journal, Nov. 93.
Design Aspects of an Oscillator Using the SC Cut Crystal by Robert Burgoo and Robert L. Wilson, Hwelett-Packard Co.
Resonators for the Microcomputer Compensated Crystal Oscillator by Raymond L. Filler and John R. Viggs.

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