The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 20, 1993
Filed:
Nov. 28, 1990
Masayoshi Tanaka, Isehara, JP;
Haruo Fukawa, Odawara, JP;
Masamitsu Endo, Gotenba, JP;
Ichiro Kadowaki, Tokyo, JP;
Yasuo Hayama, Ninomiyamachi, JP;
Sokkisha Co., Ltd., , JP;
Abstract
The invention relates to a method and apparatus for measuring the coordinates of a survey point. The apparatus uses a reflecting mirror at the survey point, a tachymeter for transmitting light to the reflecting mirror and for receiving light reflected from the reflecting mirror, first calculating means for calculating the coordinate values of two positions of the reflecting mirror, and second calculating means for calculating a coordinate value of the survey point from the coordinate values of the two reflecting mirror positions. In operation, the tachymeter transmits light to the reflecting mirror at the survey point wherein the reflecting mirror is locatable at two points present on a line passing through the survey point and which are separated from the survey point by predetermined distances. Using the reflected light from the two reflecting mirror positions, the tachymeter calculates distances between the tachymeter and the reflecting mirror at the two points from a phase difference between a received signal based on the reflected light and a reference signal. Further, the tachymeter calculates the coordinates of the survey point from a horizontal plane angle and a vertical plane angle of the reflecting mirror positions. Finally, the coordinate value of the survey point is calculated from the coordinate values of the two reflecting mirror positions.