Apparatus and method for short cycling sequences of a p-code gen

Details Apparatus and method for short cycling sequences of a p-code gen Apparatus and method for short cycling sequences of a p-code gen

1989-11-27

1991-11-26

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 46, 380 47, 364717, 331 78, G06F 102, H03B 2900, H04L 2730

Patent

active

050688723

ABSTRACT:
An improved short cycled sequencer of a P-code generator is disclosed for generating a ranging code in a Global Positioning System receiver. A shift register in the sequencer has a predetermined number of stage outputs exclusive-ored with a decoded outpout of the shift register stages and the exclusive-ored output is fed back to the serial input of the shift register. At the end of sequencing through a plurality of vectors, reinitialization of the shift register occurs without having to load an initialization vector from an external source.

REFERENCES:
patent: 3728533 (1973-04-01), Matthews
patent: 4611183 (1986-09-01), Piosenka et al.
patent: 4754465 (1988-06-01), Trimble
patent: 4785410 (1988-11-01), Hamatsu et al.
patent: 4821294 (1989-04-01), Thomas, Jr.
patent: 4827514 (1989-05-01), Ziolko et al.
patent: 4847862 (1989-07-01), Braisted et al.

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