Patent · US Expired

Rangefinder

US6087979A · kind A · utility

5Cited by

6References

11Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Valentin Magori · Gernsheim, DE
Patric Heide · Vaterstetten, DE

Key dates

Filing date	Mar 9, 1998
Grant date	Jul 11, 2000
Priority date	—
Expiry date	Mar 9, 2018

Classification

Technology area (CPC G)Physics
CPC primaryG01S7/352
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A signal source produces a frequency-modulated signal. The signal is supplied to a transmit/receive unit and transmitted. A surface-wave element produces a signal delayed by a delay from the frequency-modulated signal. A mixer mixes the delayed signal with the received signal and outputs the mixed signal to an evaluation device. The delay is preferably equal to the propagation time of a signal on the measurement path. The coherence length of the ranging apparatus is thereby substantially improved.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.