FR2392396A1 - METHOD AND APPARATUS FOR AUTOMATIC CALIBRATION OF A RADIO-ALTIMETER - Google Patents

METHOD AND APPARATUS FOR AUTOMATIC CALIBRATION OF A RADIO-ALTIMETER

Info

Publication number
FR2392396A1
FR2392396A1 FR7815741A FR7815741A FR2392396A1 FR 2392396 A1 FR2392396 A1 FR 2392396A1 FR 7815741 A FR7815741 A FR 7815741A FR 7815741 A FR7815741 A FR 7815741A FR 2392396 A1 FR2392396 A1 FR 2392396A1
Authority
FR
France
Prior art keywords
signal
transmitted
calibration
frequency
mixed
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.)
Granted
Application number
FR7815741A
Other languages
French (fr)
Other versions
FR2392396B1 (en
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.)
Boeing North American Inc
Original Assignee
Rockwell International 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 Rockwell International Corp filed Critical Rockwell International Corp
Publication of FR2392396A1 publication Critical patent/FR2392396A1/en
Application granted granted Critical
Publication of FR2392396B1 publication Critical patent/FR2392396B1/fr
Granted 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
    • 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
    • G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
    • G01S13/345—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal using triangular modulation
    • 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
    • G01S7/4052—Means for monitoring or calibrating by simulation of echoes
    • G01S7/4056—Means for monitoring or calibrating by simulation of echoes specially adapted to FMCW

Abstract

Procédé et appareil d'étalonnage automatique et de correction automatique de non-linéarité du balayage de fréquence de l'émetteur d'un radio-altimètre à modulation de fréquence à ondes entretenues. Il comprend un élément de couplage pour échantillonner le signal émis. Une ligne à retard reçoit et retarde le signal échantillonné qu'un mélangeur recombine alors avec le signal émis échantillonné courant pour produire un signal d'étalonnage utilisé comme base de temps avec laquelle on compare le signal émis réfléchi sur le sol également mélangé avec le signal d'émission courant Le signal d'étalonnage varie selon des non-linéarités du balayage de fréquence émise et annule leurs effets sur le signal mélangé revenant du soL Une boucle à phase rigide engendre des impulsions à une fréquence supérieure pour augmenter la résolution. Un convertisseur de période délivre des sorties pouvant être accumulées et traitées par un microprocesseur et une mémoire associée à envoyer à des indicateurs d'altitude appropriés. Application à la navigation aérienne.A method and apparatus for automatic calibration and automatic correction for non-linearity of the frequency sweep of the transmitter of a continuous wave frequency-modulated radio altimeter. It includes a coupling element for sampling the transmitted signal. A delay line receives and delays the sampled signal which a mixer then recombines with the current sampled transmitted signal to produce a calibration signal used as the time base with which to compare the transmitted signal reflected on the ground also mixed with the signal. transmit current The calibration signal varies with nonlinearities of the transmitted frequency sweep and negates their effects on the mixed signal returning from the SOL A rigid phase loop generates pulses at a higher frequency to increase resolution. A period converter provides outputs that can be accumulated and processed by a microprocessor and associated memory to be sent to appropriate altitude indicators. Application to air navigation.

FR7815741A 1977-05-26 1978-05-26 METHOD AND APPARATUS FOR AUTOMATIC CALIBRATION OF A RADIO-ALTIMETER Granted FR2392396A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US80068477A 1977-05-26 1977-05-26

Publications (2)

Publication Number Publication Date
FR2392396A1 true FR2392396A1 (en) 1978-12-22
FR2392396B1 FR2392396B1 (en) 1984-04-20

Family

ID=25179086

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7815741A Granted FR2392396A1 (en) 1977-05-26 1978-05-26 METHOD AND APPARATUS FOR AUTOMATIC CALIBRATION OF A RADIO-ALTIMETER

Country Status (3)

Country Link
CA (1) CA1114480A (en)
FR (1) FR2392396A1 (en)
GB (1) GB1589047A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0030053A1 (en) * 1979-11-30 1981-06-10 The Boeing Company Aircraft low range radio altimeter simulator
FR2569857A1 (en) * 1982-10-13 1986-03-07 Trt Telecom Radio Electr ELECTRICALLY VARIABLE DELAY SIMULATOR FOR FREQUENCY-MODIFIED CONTINUOUS WAVE DISTANCE MEASURING DEVICE
FR2573217A1 (en) * 1984-11-13 1986-05-16 Trt Telecom Radio Electr DELAY SIMULATOR FOR FREQUENCY-MODIFIED CONTINUOUS WAVE DISTANCE MEASURING DEVICE

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3830992A1 (en) * 1988-09-12 1990-03-22 Messerschmitt Boelkow Blohm RADAR ALTIMETER
JP2003232851A (en) * 2002-02-08 2003-08-22 Murata Mfg Co Ltd Radar and method for adjusting characteristic thereof
GB0506209D0 (en) * 2005-03-29 2005-05-04 Qinetiq Ltd Coherent frequency modulated continuous wave radar

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3340529A (en) * 1963-06-11 1967-09-05 Sanders Associates Inc Fm altimeter with reduced step error
US3341849A (en) * 1966-01-26 1967-09-12 Bendix Corp Self-calibrating, self-testing radio altimeter
US3403398A (en) * 1967-06-01 1968-09-24 Collins Radio Co Double bounce second signal return filter corrected fmcw radio altimeter
GB1207565A (en) * 1968-07-11 1970-10-07 Standard Telephones Cables Ltd Radio altimeters
US4044355A (en) * 1973-11-20 1977-08-23 Saab-Scania Aktiebolag Measurement of contents of tanks etc. with microwave radiations

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3340529A (en) * 1963-06-11 1967-09-05 Sanders Associates Inc Fm altimeter with reduced step error
US3341849A (en) * 1966-01-26 1967-09-12 Bendix Corp Self-calibrating, self-testing radio altimeter
US3403398A (en) * 1967-06-01 1968-09-24 Collins Radio Co Double bounce second signal return filter corrected fmcw radio altimeter
GB1207565A (en) * 1968-07-11 1970-10-07 Standard Telephones Cables Ltd Radio altimeters
US4044355A (en) * 1973-11-20 1977-08-23 Saab-Scania Aktiebolag Measurement of contents of tanks etc. with microwave radiations

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0030053A1 (en) * 1979-11-30 1981-06-10 The Boeing Company Aircraft low range radio altimeter simulator
FR2569857A1 (en) * 1982-10-13 1986-03-07 Trt Telecom Radio Electr ELECTRICALLY VARIABLE DELAY SIMULATOR FOR FREQUENCY-MODIFIED CONTINUOUS WAVE DISTANCE MEASURING DEVICE
FR2573217A1 (en) * 1984-11-13 1986-05-16 Trt Telecom Radio Electr DELAY SIMULATOR FOR FREQUENCY-MODIFIED CONTINUOUS WAVE DISTANCE MEASURING DEVICE
EP0182418A1 (en) * 1984-11-13 1986-05-28 Telecommunications Radioelectriques Et Telephoniques T.R.T. Delay simulator for a frequency-modulated continuous wave-ranging system

Also Published As

Publication number Publication date
CA1114480A (en) 1981-12-15
GB1589047A (en) 1981-05-07
FR2392396B1 (en) 1984-04-20

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