Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1994-02-04
1996-10-22
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
89 4117, G01S 502, F41G 100
Patent
active
055681522
ABSTRACT:
Apparatus and method for accurately determining the location of an target or other designated object by an observer that is spaced apart from the object. The observer views the target through a viewer and rangefinder and determines the distance of the target from the observer. The observer determines its own location coordinates, and the angular orientation of the rangefinder relative to a selected line or plane, using Satellite Positioning System (SATPS) signals (such as GPS or GLONASS signals) received by three SATPS antennas and processed by a common SATPS receiver/processor. The SATPS receiver/processor then determines the displacement or offset coordinates of the target relative to the observer and displays the target coordinates on the target image seen in the viewer. The target location coordinates and/or the visual image of the target seen in the viewfinder are transmitted to a control station for subsequent use. A fourth SATPS antenna, with antenna location coordinates that are determined by the location coordinates of the other three SATPS antennas, is provided for antenna backup and/or for checking the accuracy of the SATPS-determined locations of the other three SATPS antennas. Differential SATPS techniques can be used to enhance the accuracy of the SATPS antenna locations. In one embodiment, the rangefinder can be deleted.
REFERENCES:
patent: 3715953 (1973-02-01), Allan
patent: 4741245 (1988-05-01), Malone
patent: 4754280 (1988-06-01), Brown et al.
patent: 4949089 (1990-08-01), Ruszkowsi, Jr.
Ferguson et al, "Three Dimensional Attitude Determination With The Ashtech 3DF 24-Channel GPS Measurement System".
Rath et al, "Attitude Estimation Using GPS", Ion Nat.'l Tech Mtg. San Moko Jan. 1989.
Burgett et al, "The Development and Applications of GPS Determined Attitude" Paper for National Telesystems Conference (NTC 1983).
Janky James M.
Loomis Peter V. W.
Schipper John F.
Issing Gregory C.
Schipper John
Trimble Navigation Limited
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