Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1997-07-07
1999-08-10
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
701213, G01S 0502, H04B 7185
Patent
active
059365730
ABSTRACT:
A first receiver computes its position using data from sources chosen according to conditions at a second receiver and reference data. The computed position is compared with a known position. The data may be GPS positioning data from satellites and/or pseudolites and the reference data may be RTK GPS data provided by an RTK GPS reference station. The conditions at the second receiver generally correspond to satellite constellations and other parameters and the position of the first receiver may be computed by configuring the first receiver to mimic the conditions at the second receiver. The comparison of the computed position to the known position may result in an error measurement which may be used to initiate an alert condition. In a further embodiment, a receiver has first circuitry configured to compute its position using data from sources chosen according conditions at a remote receiver and reference data. The receiver may further include second circuitry for comparing the computed position with a known position. The first circuitry may include a GPS engine which is configured to compute the position from GPS data derived from GPS satellites and/or pseudolites. In yet another embodiment, a system includes a first unit and a second unit, the second unit being configured to compute its position using data from sources chosen according to conditions at the first unit and reference data. The system may also include a reference unit configured to provide RTK GPS reference data to the second unit.
REFERENCES:
patent: 5436632 (1995-07-01), Sheynblat
Dr. Nicholas C. Talbot, "Compact Data Transmission Standard for High-Precision GPS", Journal of the Institute of Navigation, pp. 1-10, (Sep./1996).
U.S. Patent Application No. 08/252,681, filed Jun. 2, 1994, entitled "Integrity Monitoring of Differential Satellite Positioning System Signals".
Hellner Mark
Trimble Navigation Limited
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