P-code generation

Details P-code generation P-code generation

1991-09-10

1993-04-13

Blum, Theodore M.

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

Directive

Including a satellite

380 46, 375 1, 364717, H04B 7185, G01S 502

Patent

active

052026949

ABSTRACT:
Improved apparatus for generation of the P-code sequences used in global positioning by issuance and sensing of code sequences issued by a plurality of satellites. The improved apparatus generates the same P-code sequences with fewer components, or with different components, by removal or replacement of: (1) a time delay/multiplexer module that allows choice of the satellite whose P-code is being formed and issued; (2) four 12-bit counters that determine the end of an epoch and are associated with four X code registers; (3) components that produce precession of an X1 code sequence relative to an X2 code sequence; and (4) an end-of-the-period counter, used to sense occurrence of the end of a chosen period, for example, 7.0 days, for purpose of P-code re-initialization.

REFERENCES:
patent: 4463357 (1984-07-01), MacDoran
patent: 4870422 (1989-09-01), Counselman
patent: 4928106 (1990-05-01), Ashjaee et al.
patent: 4928107 (1990-05-01), Kuroda et al.
patent: 5031129 (1991-07-01), Powell et al.

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