WO2009069633A1 - Distance measuring equipment - Google Patents

Distance measuring equipment Download PDF

Info

Publication number
WO2009069633A1
WO2009069633A1 PCT/JP2008/071408 JP2008071408W WO2009069633A1 WO 2009069633 A1 WO2009069633 A1 WO 2009069633A1 JP 2008071408 W JP2008071408 W JP 2008071408W WO 2009069633 A1 WO2009069633 A1 WO 2009069633A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
section
measuring equipment
distance measuring
transmitting
Prior art date
Application number
PCT/JP2008/071408
Other languages
French (fr)
Japanese (ja)
Inventor
Koichi Takizawa
Original Assignee
Murata Manufacturing Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co., Ltd. filed Critical Murata Manufacturing Co., Ltd.
Publication of WO2009069633A1 publication Critical patent/WO2009069633A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G01S13/36—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated with phase comparison between the received signal and the contemporaneously transmitted signal
    • G01S13/40—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated with phase comparison between the received signal and the contemporaneously transmitted signal wherein the frequency of transmitted signal is adjusted to give a predetermined phase relationship

Abstract

Distance measuring equipment in which the configuration and control of an RF circuit and signal processing circuit are simplified. Distance measuring equipment (1) comprises an RF circuit (2) including a local oscillator (21), a transmitting antenna (22), a receiving antenna (23), and a mixer (24) and a signal processing circuit (3) including an FFT computation section (31), a database section (32), and a comparison judging section (33). The local oscillator (21) generates a transmitting signal (St) having a frequency varying periodically depending on the phase difference between the transmitting signal (St) and a receiving signal (Sr). The mixer (24) generates an IF signal (Sif) having a frequency with the phase difference between the transmitting signal (St) and the receiving signal (Sr). The FFT computation section (31) of the signal processing circuit (3) performs the fast Fourier transform of the IF signal (Sif) and computes the ratio (V) of a double harmonic component to a fundamental wave component. The comparison judging section (33) reads data (D) having the ratio closest to the ratio (V) from the FFT computing section (31) from a database section (32) and obtains a distance (L) written to the data (D).
PCT/JP2008/071408 2007-11-27 2008-11-26 Distance measuring equipment WO2009069633A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007-305876 2007-11-27
JP2007305876 2007-11-27

Publications (1)

Publication Number Publication Date
WO2009069633A1 true WO2009069633A1 (en) 2009-06-04

Family

ID=40678528

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/071408 WO2009069633A1 (en) 2007-11-27 2008-11-26 Distance measuring equipment

Country Status (1)

Country Link
WO (1) WO2009069633A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0452586A (en) * 1990-06-21 1992-02-20 Nec Corp Distance measuring apparatus
JPH08101266A (en) * 1994-09-29 1996-04-16 Nec Corp Distance measuring instrument
JP2005106473A (en) * 2003-09-26 2005-04-21 Aisin Seiki Co Ltd Object detection system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0452586A (en) * 1990-06-21 1992-02-20 Nec Corp Distance measuring apparatus
JPH08101266A (en) * 1994-09-29 1996-04-16 Nec Corp Distance measuring instrument
JP2005106473A (en) * 2003-09-26 2005-04-21 Aisin Seiki Co Ltd Object detection system

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