Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1994-03-22
1996-10-08
Coles, Sr., Edward L.
Pulse or digital communications
Receivers
Interference or noise reduction
342358, 455 121, 3701041, H03D 104, H04B 7185, H04J 306
Patent
active
055639178
ABSTRACT:
Method and apparatus for reducing the contributions of receiver noise signal error and multipath signal error from signals received in a Satellite Positioning System (SATPS) from one or more SATPS satellites by formation and appropriate filtering of differences of signals DD that are differences of SATPS signals received by the SATPS receiver/processor. A difference signal DD of code-phase-derived delta range signals and carrier-phase-derived delta range signals is formed, and this difference signal is passed through a first statistical processing filter with an associated time constant .tau.1 in the approximate range 50-[500] 100 sec, to produce smoothed or filtered signal with the estimated receiver noise error reduced or removed. The difference signal DD is passed through second and third statistical processing filters having associated time constants .tau.2=5-20 sec and .tau.3=50-[500] 1000 sec, and the difference of the output signals of the second and third statistical processing filters is formed and subtracted from DD to form a new difference signal. This new difference signal is passed through a fourth statistical processing filter with an associated time constant .tau.4=50-[500] 1000 sec, to produce a smoothed or filtered signal with the estimated multipath signal error and estimated receiver noise error reduced or removed.
REFERENCES:
patent: 4457007 (1984-06-01), Gutleber
patent: 4672638 (1987-06-01), Taguchi et al.
patent: 5323322 (1994-06-01), Mueller
patent: 5418538 (1995-05-01), Lau
patent: 5436632 (1995-07-01), Sheynblat
patent: 5450448 (1995-09-01), Sheynblat
Coles Sr. Edward L.
Esposo Allan A.
Schippar John
Trimble Navigation Limited
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