JPS5657971A - Signal processing method for car loading type doppler radar - Google Patents

Signal processing method for car loading type doppler radar

Info

Publication number
JPS5657971A
JPS5657971A JP13374679A JP13374679A JPS5657971A JP S5657971 A JPS5657971 A JP S5657971A JP 13374679 A JP13374679 A JP 13374679A JP 13374679 A JP13374679 A JP 13374679A JP S5657971 A JPS5657971 A JP S5657971A
Authority
JP
Japan
Prior art keywords
signal
time
fading
outputs
frequencies
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP13374679A
Other languages
Japanese (ja)
Inventor
Akira Egawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komatsu Ltd
Original Assignee
Komatsu 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 Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP13374679A priority Critical patent/JPS5657971A/en
Publication of JPS5657971A publication Critical patent/JPS5657971A/en
Pending legal-status Critical Current

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
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating

Abstract

PURPOSE:To detect the signal drop-out owing to fading rapidly by measuring the period of the Doppler signal, detecting the signal drop-out owing to fading with a slight delay from the length of its time and outputting the fading detected signal. CONSTITUTION:A Doppler radar 1, disposed in the predetermined position of a vehicle, radiates microwaves, detects the reflected waves thereof, and outputs the Dopper signal fD of the frequencies corresponding to vehicle speeds. A waveform shaping and multiplying circuit 3 converts the input signal to the pulse train of the frequencies (n) times the frequencies of said signal and outputs the signal Pd. A signal processing circuit 4 measures the time interval of between the pulses and pulses of the pulse train inputted, checks the time of the pulse incoming next by the forecast value calculated from the measured value TN of the previous time and outputs the fading detected signal S by deciding that the signal drop-out has occured when the next pulse does not arrive despite elapsing of the time.
JP13374679A 1979-10-17 1979-10-17 Signal processing method for car loading type doppler radar Pending JPS5657971A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13374679A JPS5657971A (en) 1979-10-17 1979-10-17 Signal processing method for car loading type doppler radar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13374679A JPS5657971A (en) 1979-10-17 1979-10-17 Signal processing method for car loading type doppler radar

Publications (1)

Publication Number Publication Date
JPS5657971A true JPS5657971A (en) 1981-05-20

Family

ID=15111952

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13374679A Pending JPS5657971A (en) 1979-10-17 1979-10-17 Signal processing method for car loading type doppler radar

Country Status (1)

Country Link
JP (1) JPS5657971A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS504318A (en) * 1973-05-22 1975-01-17

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS504318A (en) * 1973-05-22 1975-01-17

Similar Documents

Publication Publication Date Title
EP0321717A3 (en) Ultrasonic speckle velocity measurement method and apparatus
US4492118A (en) Nondestructive testing of structural material by means of ultrasonics
GB1599258A (en) Method of and system for evaluating received radar pulse trains
JPS5353386A (en) Time difference detection circuit
GB1437961A (en)
JPS5657971A (en) Signal processing method for car loading type doppler radar
JPS56153267A (en) Distance measuring device using ultrasonic wave
JPS56111480A (en) Measuring device for motion speed
JPS5722576A (en) Ultrasonic type vehicle speed measuring apparatus
GB1187775A (en) Improvements in or relating to Ultra-Sonic Presence Detectors
GB1525260A (en) Range measurement apparatus and methods of measuring rang
GB1433766A (en) Apparatus for determining the time of attainment of a reference value of an electrical signal
JPS55116285A (en) Detecting device for very slow speed
JPS57184041A (en) Detection device of the multi-feed of paper
JPS5633576A (en) Obstacle detecting method for measurement of distance between cars
JPS57124211A (en) Ultrasonic measuring device
SU1744509A1 (en) Device for measurement of ultrasound velocity
SU789735A1 (en) Ultrasonic flaw detector
SU1111098A1 (en) Ultrasonic device for checking articles
JPS5624589A (en) Distance measuring apparatus
RU1781422C (en) Method of processing of echo signal of borehole
JPS5658682A (en) Ultrasonic transmitting and receiving signal interval measuring method
JPS568916A (en) Unique word detecting circuit
JPS5510501A (en) Measuring method of signal detection time
SU1422137A1 (en) Ultrasonic echo-pulse flaw detector