Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1997-12-05
1998-12-08
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
G01S 502
Patent
active
058476806
ABSTRACT:
A carrier ambiguity detector for resolving a 1/2 cycle carrier phase ambiguity in an incoming GPS signal before the arrival of the next preamble by detecting a match or an inverted match between an internally stored expected data message and the incoming data in the remaining subframe before the arrival of the next preamble. The carrier ambiguity detector of the present invention includes a buffer for buffering incoming data, a data memory for storing time-tagged expected data, a data pointer for selecting certain expected data corresponding to a GPS-based time that is synchronized to the incoming data, non-inverting and inverting comparators for comparing the buffered data to the expected data, and a data compare detector coupled to the comparators for indicating a non-inverted or an inverted match for a zero degree or a one-hundred eighty degree resolution, respectively, of carrier phase information.
REFERENCES:
patent: 5359332 (1994-10-01), Allsion et al.
patent: 5451964 (1995-09-01), Babu
patent: 5798732 (1998-08-01), Eshenbach
Hatch, Ron, "Instantaneous Ambiguity Resolution", KIS Symposium 1990, Banff, Canada, pp. 1-12, Sep. 11, 1990.
Gildea David R.
Issing Gregory C.
Trimble Navigation Limited
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