IE802052L - Echo-type range finding system - Google Patents

Echo-type range finding system

Info

Publication number
IE802052L
IE802052L IE802052A IE205280A IE802052L IE 802052 L IE802052 L IE 802052L IE 802052 A IE802052 A IE 802052A IE 205280 A IE205280 A IE 205280A IE 802052 L IE802052 L IE 802052L
Authority
IE
Ireland
Prior art keywords
signal
echo
predetermined period
processing means
rangefinding
Prior art date
Application number
IE802052A
Other versions
IE50163B1 (en
Original Assignee
Polaroid Corp
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 Polaroid Corp filed Critical Polaroid Corp
Publication of IE802052L publication Critical patent/IE802052L/en
Publication of IE50163B1 publication Critical patent/IE50163B1/en

Links

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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/523—Details of pulse systems
    • G01S7/526—Receivers
    • G01S7/527—Extracting wanted echo signals

Abstract

An echo type rangefinding a system, preferably using ultrasonic energy bursts, includes a transducer for transmitting and receiving the energy burst and signal processing means for identifying a true echo of the energy burst (54) from a selected target. The signal processing means discriminates against spurious signals and electronic noise, some of which may be generated by the rangefinding system itself, by rejecting signals that do not persist for at least a predetermined period. Preferably, the system recognizes the leading edge of a true echo signal by sampling the integrated signal (156) at sampling intervals (158) which are small compared with the said predetermined period (for example 0.6 milliseconds). If the samples integrated signal voltage (Vc) steadily increases at at least a given minimum rate for at least the predetermined period then the signal processing means provides an "object detect" signal. The accuracy of the rangefinding system is improved firstly because of the improved signal discrimination, and secondly because the object detect signal is always produced at the same time after the beginning of the true echo signal. <IMAGE> [GB2059590A]
IE2052/80A 1979-10-03 1980-10-02 Improved echo recognition system IE50163B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US8135779A 1979-10-03 1979-10-03

Publications (2)

Publication Number Publication Date
IE802052L true IE802052L (en) 1981-04-03
IE50163B1 IE50163B1 (en) 1986-02-19

Family

ID=22163638

Family Applications (1)

Application Number Title Priority Date Filing Date
IE2052/80A IE50163B1 (en) 1979-10-03 1980-10-02 Improved echo recognition system

Country Status (10)

Country Link
JP (1) JPS5660374A (en)
AT (1) AT375198B (en)
AU (1) AU536697B2 (en)
CA (1) CA1154140A (en)
CH (1) CH651387A5 (en)
DE (1) DE3037139A1 (en)
FR (1) FR2466780B1 (en)
GB (1) GB2059590B (en)
IE (1) IE50163B1 (en)
IT (1) IT1133656B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8334394D0 (en) * 1983-12-23 1984-02-01 Czajowski S B Electrical circuits
EP0173243B1 (en) * 1984-08-28 1991-01-16 Hewlett-Packard Company Apparatus for measuring the velocity of a stream of particles
DE4433957A1 (en) * 1994-09-23 1996-03-28 Mayser Gmbh & Co Ultrasonic obstacle detection method
GB2338132B (en) * 1998-06-02 2003-05-28 Federal Ind Ind Group Inc Echo detection in echo ranging systems
DE102012200024A1 (en) 2012-01-02 2013-07-04 Robert Bosch Gmbh Method and environment detection device for determining the position and / or movement of at least one object in the vicinity of a movement aid by means of at least one acoustic pulse
DE102012200716A1 (en) * 2012-01-19 2013-07-25 Robert Bosch Gmbh Method for determining the position and / or movement of objects in the vicinity of a movement aid by means of sound signals and device for carrying out the method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1566852C3 (en) * 1967-10-12 1974-02-07 Fried. Krupp Gmbh, 4300 Essen Arrangement for differentiating echo sounder pulses
US3701090A (en) * 1970-12-22 1972-10-24 Amf Inc Shipboard acoustic receiver
JPS5121852A (en) * 1974-08-15 1976-02-21 Furuno Kyotaka TANTAIBUTSUTAIHANBETSUSOCHI
CA1120578A (en) * 1976-10-04 1982-03-23 Juerg Muggli Ultrasonic ranging system for a camera
US4199246A (en) * 1976-10-04 1980-04-22 Polaroid Corporation Ultrasonic ranging system for a camera
DE2726981C2 (en) * 1977-06-15 1984-11-22 Fried. Krupp Gmbh, 4300 Essen Device for measuring time between pulses
JPS5484762A (en) * 1977-12-17 1979-07-05 Fuji Roiyaru Kk Noise reject device of ultrasonic underwater detector

Also Published As

Publication number Publication date
AT375198B (en) 1984-07-10
JPS5660374A (en) 1981-05-25
AU536697B2 (en) 1984-05-17
DE3037139A1 (en) 1981-04-16
DE3037139C2 (en) 1993-04-01
GB2059590B (en) 1984-02-29
JPH0156712B2 (en) 1989-12-01
CH651387A5 (en) 1985-09-13
GB2059590A (en) 1981-04-23
ATA493880A (en) 1983-11-15
CA1154140A (en) 1983-09-20
AU6281080A (en) 1981-04-09
IT8025072A0 (en) 1980-10-02
IT1133656B (en) 1986-07-09
IE50163B1 (en) 1986-02-19
FR2466780A1 (en) 1981-04-10
FR2466780B1 (en) 1986-02-28

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