P-code generation
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United States of America Patent
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Apr 13, 1993
Grant Date -
N/A
app pub date -
Sep 10, 1991
filing date -
Sep 10, 1991
priority date (Note) -
Expired
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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.
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