Enhanced L1/L2 code channel for global positioning system receiv

Details Enhanced L1/L2 code channel for global positioning system receiv Enhanced L1/L2 code channel for global positioning system receiv

1991-03-29

1993-09-14

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 342357, H04L 2730

Patent

active

052456285

ABSTRACT:
An enhanced P-code channel (60) for use in a GPS receiver (10) to simultaneously track L1 and L2 comprises a P-code clock generator (62) for generating two code clocks. The first code clock associates with L1 and the second associates with L2. The code clocks have the same frequency but different phases from one another. Circuitry (64) and (66) generate and store a plurality of P-code chips. A first circuit (68, 70) selects and updates P-code chips from the stored P-code chips that are in phase with the L1 code clock. A second circuit (72 and 74) selects and updates P-code chips from the P-code chips and phased with the L2 code clock.

REFERENCES:
patent: 4468793 (1984-08-01), Johnson et al.
patent: 4485383 (1984-11-01), Maher
patent: 4809005 (1989-02-01), Counselman, III
patent: 4821294 (1989-04-01), Thomas, Jr.
patent: 4894662 (1990-01-01), Counselman
patent: 4928106 (1990-05-01), Ashjaee et al.

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