Electronic level
AssigneeSokkia Topcon Co., Ltd.
InventorTakashi Nagao
Life of this patent
Estimating the term…
Abstract
Provided is an electronic level capable of accurately measuring a height difference between two points even when a waving method of finding and determining as a measured height a minimum value of read heights while rocking a leveling rod back and forth is used. An electronic level includes leveling rod reading-in means (S2) which reads graduations on a leveling rod being rocked back and forth and stores read heights, and stores the time of reading, approximate function determining means (S3) which approximates the read heights read in by the leveling rod reading-in means by a quadratic function of time, and measured value calculating means (S4) which determines a minimum value of the quadratic function approximated by the approximate function determining means as a measured height.
Claims6
An electronic level comprising:
- leveling rod reading-in means which periodically reads the heights of graduations on a leveling rod being rocked back and forth and stores the heights read at each period,
- approximate function determining means which generates a curve formed by a polynomial function of time that approximates a plot of the read heights read in by the leveling rod reading-in means, and
- measured value calculating means which determines a minimum value of the polynomial function of time approximated by the approximate function determining means as a measured height.
An electronic level comprising:
- leveling rod reading-in means which periodically reads graduations on a leveling rod being rocked back and forth and stores heights read at each period, and stores a time of reading,
- approximate function determining means which generates a curve formed by a polynomial function of time that approximates a plot of the read heights in the vicinity of a portion of the curve including a maximum height read in by the leveling rod reading-in means, and
- measured value calculating means which determines a minimum value of the polynomial function of time approximated by the approximate function determining means as a measured height.
A method of operating an electronic level having a leveling rod reading-in means, an approximate function determining means, and a measured value calculating means, comprising the steps of:
- periodically reading graduations on a leveling rod being rocked back and forth and stores heights read at each period, and stores a time of reading,
- generating a curve formed by a polynomial function of time that approximates a plot of the read heights in the vicinity of a portion of the curve including a maximum height read in by the leveling rod reading-in means, and
- determining a minimum value of the polynomial function of time approximated by the approximate function determining means as a measured height.
Dependencies are inferred from the claim text.