Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1996-03-25
1998-06-02
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
With photodetection
3561413, 342357, G01B 1126, E02F 376
Patent
active
057609098
ABSTRACT:
An electronic distance measurement EDM apparatus (41) for attachment to a range pole (42), having a GPS antenna (12) having a circular exterior (46) with a reflective outer surface (54) for reflecting an EDM light beam (56) over an angular azimuth range of 360.degree.. The reflective outer surface (54) is a thin material such as tape or paint. A GPS receiver (16) connects to the GPS antenna (12) for providing a GPS-derived location of a phase center (18) of the GPS antenna (12). An optional radio transmitter (20) transmits information for the GPS-derived location in a GPS location data signal (22). An optional radio receiver (24) receives a differential GPS (DGPS) correction signal (26) and/or a GPS real time kinematic signal (28) for use in improving the accuracy of calculation of the GPS-derived location. An integrated global positioning system / electronic distance measurement (GPS/EDM) surveying system (40) includes the EDM apparatus (41), the range pole (42), and a total station (58). The total station (58) calculates a range by beaming the EDM light beam (56) to the reflective outer surface (54) and receiving a reflection (62).
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Spectra-Physics Geodimeter.RTM. 140T The Autotracking Total Station Operating Manual, Publ. No. GEO-0050 1989 pp. 1.1-7.2 for system pp. 5.9-5.10 prism reflector Geotronics Division of Spectra-Physics, Dayton, Ohio.
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Condor Earth Powerpole.TM. Reflectorless Surveying no date pp. 1-2 Sonora, CA.
Gildea David R.
Hellner Mark
Trimble Navigation Limited
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