Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1993-04-30
1995-09-12
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
342358, 455 121, 3701041, H03D 104, H03D 106
Patent
active
054504481
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 carder-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 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 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 sec, to produce a smoothed or filtered signal with the estimated multipath signal error and estimated receiver noise error reduced or removed.
REFERENCES:
patent: 4652884 (1987-03-01), Starker
patent: 4860317 (1989-08-01), Tomlinson
patent: 5155490 (1992-10-01), Spradley, Jr. et al.
Sennot et al. "Multipath Sensitivity & Carrier Slip Tolerance of An Intergrated Doppler DGPS Navigation Algorithm", IEEE Plans '90: Position location & Navigation.
Symposium Record. "The 1990's--A Decade of Excellence in the Navigation Sciences."pp. 638-644.
Chin Stephen
Schipper John
Trimble Navigation Limited
Webster Bryan E.
LandOfFree
Removal of signal errors for differential satellite positioning does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Removal of signal errors for differential satellite positioning , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Removal of signal errors for differential satellite positioning will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-411849