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Distance measurement method and device

A technology of distance measurement and distance, which is applied in the field of distance measurement and the device described above, and can solve problems such as extreme values ​​of difficult amplitudes

Inactive Publication Date: 2005-07-27
SHIMA SEIKI MFG LTD
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  • Abstract
  • Description
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Problems solved by technology

Therefore, even if the phase shift can be obtained correctly, it is difficult to determine the extreme value of the amplitude

Method used

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  • Distance measurement method and device
  • Distance measurement method and device
  • Distance measurement method and device

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Embodiment Construction

[0039] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0040] figure 1A structure for measuring distance according to an embodiment of the present invention is schematically represented. The distance measuring device 1 is capable of changing the oscillation frequency according to the voltage applied by an external unit, and a voltage-controlled oscillator (abbreviated as VCO) 2 generates a high-frequency electrical signal, which is sent to an antenna 4 through a transmission system 3, so that The transmission system described above is used to achieve power amplification and impedance matching. The antenna 4 converts the fed-in high-frequency electrical signal into electromagnetic waves emitted to the surrounding space. In the case where the target 5 as the object to be measured is at a distance d in the traveling direction of the electromagnetic wave transmitted from the antenna 4, due to the interference ...

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Abstract

A distance can be measured with a high resolution. A frequency controller (7) controls a voltage control oscillator (2) so as to change a signal source frequency f in a range containing two central frequencies f1 and f2 and transmits it as a progressive wave from an antenna (4) to a target (5). A reflected wave reflected by the target (5) and the progressive wave interfere each other and form a standing wave. A power detector (6) detects power corresponding to the amplitude of the standing wave and performs Fourier transform based on the two central frequencies f1 and f2 in Fourier transform means (11, 12), respectively, thereby calculating radar image functions P1(x), P2(x). The distance d to the target (5) satisfies the conditions that the phase difference of the two radar image functions zero-crosses and the amplitude of the radar image functions becomes maximum. The zero cross point of the phase difference is a zero cross point of a linear function and can be identified with a high resolution.

Description

technical field [0001] The present invention relates to a distance measuring method capable of measuring a distance to an object to be measured in a non-contact manner using standing waves. Background technique [0002] So far, distance measurement is a measurement of a basic physical quantity, and many methods have been used for distance measurement. The "distance" is equal to the "length" in physical size, conceptually they usually overlap. When a measuring instrument is used to measure an object to be measured without bringing the instrument into contact with the object, the measurement is generally referred to as a "distance" measurement, whereas when an object is measured using a measuring instrument in contact with the object, Such measurements are often referred to as "length" measurements. The basic measure used to measure length is a ruler, which is calibrated to a predetermined datum. [0003] Japanese Unexamined Patent Publication JP-A-3-144306 (1991) discloses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/32
CPCG01S13/32G01S13/887G01S13/40
Inventor 上保徹志入谷忠光
Owner SHIMA SEIKI MFG LTD
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