Light wave distance measuring apparatus
US5400130A · kind A · utility
43Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 19, 1993 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | May 19, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/493
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A light wave distance measuring apparatus structured such that frequency dividing circuits create a base intermediate frequency outputted to a phase measuring circuit and a PLL reference frequency which is a multiple of an integer a (a.gtoreq.2) of the base intermediate frequency, and this PLL reference frequency is outputted to a PLL oscillation circuit, thereby preventing an error in the measurement of distance due to spurious components caused when measuring a phase in the light wave distance measurement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.