Position measuring method and apparatus

Details Position measuring method and apparatus Position measuring method and apparatus

G - Physics

01

C

354/25

G01C 9/06 (2006.01) G01C 7/06 (2006.01) G01C 15/00 (2006.01)

Patent

CA 1214555

ABSTRACT "POSITION MEASURING METHOD AND APPARATUS" A method of, and apparatus for, determining the position of an unknown fixed location, e.g. the end of an underground passage inaccessible to human beings, involves establishing a chain of measuring stat- ions (D1, D2, D3 ....) of known station spacing between a base and a position at the unknown fixed location. Each station (except, optionally, the fore- most one) of the chain is provided with light sources (L1, L2, L3, L4.....) and photodetectors as well as a goniometer for measuring in at least one plane the angle of inclination (?) of the station immediately ahead of it. The stations of the chain are spaced apart by a known distance and arranged so that each station is within the operative range of the immediately preceding station. By transmitting the measurement results from each station to the base, and processing the data, the position of the fixed location may be calculated, recorded and/or displayed.

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