Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1995-12-07
1998-09-15
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
701213, H04B 7185, G01S 502
Patent
active
058085815
ABSTRACT:
In a GPS navigation satellite receiver, a pseudorange step detection method integrates the pseudorange rates to predict expected changes in the pseudoranges from one measurement to the next. The pseudorange rate is directly measured as the carrier Doppler shift. The pseudorange and pseudorange rate from a last measurement from each satellite and a pseudorange rate from a new measurement are used to estimate the expected pseudorange. Such estimate accounts for vehicle velocity and accelerations. The expected pseudorange is compared to a newly measured pseudorange. An impermissible pseudorange step is declared when the difference exceeds a variable threshold. Tests can be done on measurements taken up to ten seconds apart, e.g., using a threshold of five hundred meters. The maximum position dilution of precision is typically set at a value of twelve. Satellites that manifest a pseudorange step are thereafter excluded from participating in subsequent position solution activity.
REFERENCES:
patent: 5390124 (1995-02-01), Kyrtsos
patent: 5436632 (1995-07-01), Sheynblat
patent: 5490073 (1996-02-01), Kyrtsos
Beckmann Martin
Braisted Paul E.
Blum Theodore M.
Schatzel Thomas E.
Trimble Navigation Limited
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