WO2006018355A1 - Procede de mesure de distance dans un systeme de communication a frequence porteuse sans fil et systeme de communication a frequence porteuse pour mettre en oeuvre ce procede - Google Patents

Procede de mesure de distance dans un systeme de communication a frequence porteuse sans fil et systeme de communication a frequence porteuse pour mettre en oeuvre ce procede Download PDF

Info

Publication number
WO2006018355A1
WO2006018355A1 PCT/EP2005/053298 EP2005053298W WO2006018355A1 WO 2006018355 A1 WO2006018355 A1 WO 2006018355A1 EP 2005053298 W EP2005053298 W EP 2005053298W WO 2006018355 A1 WO2006018355 A1 WO 2006018355A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmitting
receiving unit
signal
analysis
distance
Prior art date
Application number
PCT/EP2005/053298
Other languages
German (de)
English (en)
Inventor
Thomas Klement
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2006018355A1 publication Critical patent/WO2006018355A1/fr

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
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/82—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted
    • G01S13/84—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted for distance determination by phase measurement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • 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
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00793—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by Hertzian waves
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
    • G07C2209/60—Indexing scheme relating to groups G07C9/00174 - G07C9/00944
    • G07C2209/63—Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle

Definitions

  • conditional access control systems usually consist of a stationary transmitter and receiver unit arranged in the vehicle and of at least one key, i. a mobile transmitting and receiving unit. By wireless data transmission between the two transmitting and receiving units, the access authorization of the person in possession of the key can be checked.
  • a mobile transmitting and receiving unit By wireless data transmission between the two transmitting and receiving units, the access authorization of the person in possession of the key can be checked.
  • One way to determine the distance between the two transmitting and receiving units is that the located in the vehicle transmitting and receiving unit emits a signal having a certain carrier frequency, which is received by the mobile transmitting and receiving unit when the transmission signal has a sufficient signal strength at the receiving location.
  • the mobile transmitting and receiving unit can detect the signal and synchronize a local oscillator to the carrier frequency of the received signal.
  • the mobile transmitting and receiving unit can then send a response signal to the stationary transmitting and receiving unit, wherein the response signal at the location of the mobile transmitting and receiving unit is in phase with the signal received at this receiving location, of the fixed transmitting and receiving Receiving unit emit ⁇ was animal.
  • the response signal is in turn received by the stationary transmitting and receiving unit, wherein the stationary transmitting and receiving unit can determine the distance from the phase relationship between the transmission signal and the response signal.
  • phase shift between the received signal and a signal of the same frequency derived from the local oscillator can then be determined in each of the two transmitting and receiving units. In connection with the response signal, this phase shift can then be transmitted in the form of corresponding data from the mobile transmitting and receiving unit to the stationary transmitting and receiving unit.
  • any phase distortion of the transmission path affects the accuracy of the distance determination.
  • An extreme case of such a phase distortion arises in particular when multiple reception occurs, ie for example when the respective signal is transmitted directly on the way between the two transmitting and receiving units and when there are simultaneous reflected signal components. Such reflections can arise on reflective surfaces, such as other vehicles, house walls and the like.
  • the transmission of corresponding signals from further transmitting and receiving units also has a phase-distorting effect in the same way.
  • the invention is therefore based on the object of providing a method for measuring the distance between a first and a second transmitting and receiving unit of a wireless carrier-frequency communication system, in particular an access authorization control system for a motor vehicle, in which Measuring errors caused by phase distortion of the transmission path can be detected and therefore the measurement result can be assessed in terms of its correctness. Furthermore, the object of the invention is to provide a wireless carrier frequency communication system in which this method is integrated.
  • the invention is based on the finding that extreme distortions, such as those caused by the occurrence of multipath reception, can be detected by generating a predetermined analysis transmission signal from one of the two transmitting and receiving units in an analysis mode whose spectral width substantially equal to the carrier frequency communication system assigned channel width and that the respective other sen ⁇ de- and receiving unit in the analysis mode from the received from it, with the analysis transmission signal corresponding analysis received signal a reliability factor for the evaluation of the correctness of the result for determining the distance determined.
  • an attempt is made in this case to draw conclusions about the system transmission function of the transmission path from the analysis received signal and the knowledge about the transmitted analysis transmission signal.
  • At least one value for the distance between the first and second values can be determined when a predefined threshold value for the reliability factor is exceeded or undershot or when a predefined value range for the reliability factor is exceeded or exceeded and the second transmitting and receiving unit are rejected as invalid.
  • a renewed distance determination can, for example, also be carried out only if a 'valid' reliability factor could be determined in the analysis mode. Of course, the distance determination can also be carried out simultaneously with the determination of the reliability factor.
  • the frequency dependence of the phase or the group delay and / or the frequency dependence of the signal strength of the received analysis signal can be determined substantially over the entire bandwidth of the channel.
  • the group delay can be determined by differentiating the frequenzabh brieflyi ⁇ gene phase.
  • Receive signal is visible. Since it can usually be assumed that extreme distortion of the amount of the system function also causes a corresponding phase distortion, it can be assumed that a distance measurement by the evaluation can be assumed even in the case of impermissibly large distortions of the amount of the system function of the transmission path phase information is not possible with sufficient accuracy. In this case, for example, the difference between the maximum and the minimum signal strength of the respective received signal can be determined and used as a reliability factor.
  • a preferably sinusoidally frequency-modulated analysis transmission signal having a carrier frequency preferably corresponding to the channel center may be used, wherein the modulation deviation is preferably substantially equal to half the channel bandwidth.
  • the modulation deviation is preferably substantially equal to half the channel bandwidth.
  • the result is an amplitude-demodulated signal which oscillates at twice the frequency as the modulation signal for the frequency-modulated analysis transmission signal. From the phase position of the amplitude demodulated signal and the modulation signal can then be determined whether it is a local minimum or maximum.
  • the temporal fluctuation of the signal strength of the analysis received signal i. the fluctuation of the amplitudendemodul striving signal to determine a reliability factor are evaluated, preferably the difference between the maximum and the minimum signal strength and the difference between the maximum and minimum value of the amplitude demodulated Sig ⁇ nals is used as a reliability factor.
  • FIG. 1 is a schematic representation of a wireless carrier frequency communication system in the form of an access authorization control system for a motor vehicle;
  • Fig. 2 are schematic diagrams of a frequency-dependent
  • Fig. 3 is a schematic representation of the amount of a distorted by multipath reception frequency-dependent
  • FIG. 4 shows a schematic representation of the components of a carrier frequency essential for the invention.
  • Fig. 5 is a schematic representation of the essential for the invention components of a second embodiment of a carrier frequency communication system according to the invention.
  • a carrier frequency communication system 1 schematically shows a carrier frequency communication system 1, which comprises a transmitting and receiving unit 5, which is stationarily arranged in a motor vehicle 3, and a mobile transmitting and receiving unit 7.
  • the wireless carrier frequency communication system 1 can be embodied as an access authorization control system for the motor vehicle.
  • Each of the transmitting and receiving units 5, 7 has a transmitting and receiving antenna 9 and 11, respectively.
  • the carrier frequency communication system 1 can be designed in a manner known per se such that it is capable of determining the distance of the mobile transmitting and receiving unit 7 from the stationary transmitting and receiving unit 5 arranged in the motor vehicle.
  • the data or signal transmission between the transmitting and receiving units 5, 7 can take place, for example, by the transmission of frequency- or phase-modulated signals between the transmitting and receiving antennas 9 and 11, respectively.
  • the determination of the distance between the two transmitting and receiving units 5, 7 can take place by evaluating the phase shift between the signal transmitted by a transmitting and receiving unit and the receiving signal returned by the respective other transmitting and receiving unit. A detailed explanation of the determination of the distance from this phase information can be dispensed with, since these are methods known per se.
  • the signal path I represents the direct transmission path between the two transmitting and receiving antennas 9, 11.
  • the signal path II shows, by way of example, the reflection of the signal transmitted by the transmitting and receiving antenna 9 at a reflecting object 13, the reflected signal component then passing along the further course signal path II to the transmitting and receiving antenna 9 of the stationary transmitting and Empfangsein ⁇ unit 5 in the motor vehicle passes.
  • FIG. 2 a shows schematically the course of the phase of the transmission function of the transmission path between the two transmitting and receiving units 5, 7.
  • the phase progression would be strictly linear.
  • the curvature of the assumed practical phase curve shown in FIG. 2a indicates a considerable distortion, which may be caused in particular by multipath reception, ie by signal reflections.
  • the band width ⁇ f of the transmission channel provided for the carrier frequency communication system 1 lies exactly in the range of the greatest distortions of the frequency-dependent system transmission function in the exemplary embodiment assumed in FIG.
  • phase progression in FIG. 2 a is curved, ie, for example, the more multipath reception is pronounced, the higher is the probability that the result of the distance determination. is not sufficiently accurate, ie deviates by more than a vorgege ⁇ benen amount of the actual measurement result.
  • the minimum and the maximum value of the group delay ⁇ g within the bandwidth ⁇ f of the transmission channel can be determined as a measure of the curvature of the phase curve, ie as a measure of the phase distortion.
  • the amount difference between the maximum and minimum len value of the group delay ⁇ g within the Kanalbandbrei ⁇ te .DELTA.f be used as a reliability factor for assessing the Korrekt ⁇ unit of the result for the distance determination.
  • the result for the distance determination may be rejected as inadmissible, because in all probability too inaccurate, if the reliability factor determined in the above manner is greater than a predefined threshold value.
  • the reliability factor can also be determined in another way by determining the deviation of this progression from an ideal linear course of an undistorted transmission channel according to a suitable method from the course of the phase ⁇ (f) and a correspondingly determined value as Reliability factor is used.
  • a reliability factor is determined by, for example, the mobile transmitting and receiving unit 7 generating an analysis transmission signal S a having a spectral width which essentially corresponds to the band width ⁇ f of the transmission channel.
  • This transmit signal may be a sinusoidal carrier signal whose frequency is varied in the form of a ramp from the left lower limit frequency of the transmission channel to the upper right limit frequency of the transmission channel.
  • a discrete change in the frequency of this analysis transmission signal S a can also take place (frequencies f x -fg in FIG. 2).
  • each analysis transmission signal S 3 at a specific frequency with respect to a local reference signal of the mobile transmitting and receiving unit 7 has a constant phase relationship, ie a constant phase difference - points.
  • each frequency of the analysis transmission signal S a it is also possible for each frequency of the analysis transmission signal S a to measure the phase relationship with respect to the local and temporally stable reference signal and to evaluate it. tion of the phase shift, the stationary transmitting and receiving unit 5 are transmitted.
  • the distortion of the phase within the transmission channel for example by the determination of a value which reflects the curvature of the frequency-dependent phase in the entire transmission channel, can be determined.
  • the transmitting and receiving unit 5 can comprise, in addition to the transmitting and receiving antenna 9, a noise-like amplifier 15, which amplifies the received signal E a fed thereto by the antenna 9 and a band filter 17 connected downstream supplies.
  • the bandpass filter 17 may have a bandpass characteristic whose lower and upper cutoff frequencies define the channel bandwidth of the transmission channel.
  • the band filter 17 is followed by a mixer 19, which mixes the signal supplied by the band filter 17 with a mixing signal supplied by a local oscillator unit 21.
  • the mixed signal comprises a component which includes the phase between the received signal E a and the mixed signal of the local oscillator unit 21.
  • This signal is fed to a controller unit 23, which evaluates the signal supplied to it and carries out all necessary calculations for determining the reliability factor.
  • the controller unit 23 can of course include suitable software.
  • the transmitting and receiving unit 7 can generate an analysis transmission signal, which in each case oscillates sinusoidally with a specific frequency Fi for a specific period of time.
  • the transmitting and receiving unit 5 can have knowledge of the time span for which the analysis transmission signal S a in each case has a specific carrier frequency Fi.
  • the local oscillator unit 21 of the transmitting and receiving unit 5 can generate a mixed signal with the respective frequency F 1 at the same time intervals.
  • the analysis transmission signal S a can also be generated such that in each case a continuous time-dependent change of the frequency takes place.
  • the local oscillator unit 21 of the transmitter and receiver unit generates the mixed signal accordingly.
  • the spectral width of the analysis transmission signal S 3 is at least as great as the bandwidth ⁇ f of the transmission channel.
  • the term of the spectral width of the analysis transmission signal S a is understood to include a time-varying spectrum of the analysis transmission signal.
  • the spectral width of the analysis transmission signal S a is determined by neglecting the time dependence in a time-variant spectrum of the analysis transmission signal, ie by superimposing all temporal snapshots of the time-variant transmission spectrum.
  • the amplitude-modulated signal component can be amplitude-demodulated in the transmitting and receiving unit 5, wherein the amplitude-demodulated signal AM fluctuates with a temporal frequency which, in the case illustrated in FIG. 3, is twice as large as the frequency of the modulation signal FM for generation the frequency-modulated analysis transmission signal
  • a frequency-modulated analysis transmission signal can be generated whose spectrum substantially covers the entire channel width. If this analysis transmission signal S a is generated without the presence of an amplitude modulation, then, upon occurrence of an FM-AM conversion at the reception location, a corresponding distortion of the amount of the system transmission function S (f) of the transmission channel are closed.
  • at least one amplitude demodulator unit (AM demodulator unit) 25 is connected between the output of the mixer 19 and the controller unit 23.
  • the local oscillator unit 21 In the case of the transmitting and receiving unit 5 according to FIG. 5, the local oscillator unit 21 generates a mixing frequency which is suitable for producing a simple further intermediate frequency to be processed at the output of the mixer 19 in the usual way.
  • This receive signal which is mixed down to the intermediate frequency, is fed to the amplitude demodulator unit 25, which generates the amplitude-demodulated signal at its output and supplies it to the controller unit 23.
  • the total stroke of the amplitude-demodulated signal AM can be evaluated by the controller unit 23, for example by determining the difference between the maximum values and the minimum values. This difference can also serve as a reliability factor. The greater this reliability factor, the greater the distortion of the amount of the system transfer function S (f) and thus, as a rule, also the phase distortion of the transmission channel.
  • the output signal of the mixer 19 mixed down to the intermediate frequency can also be supplied to a frequency demodulator unit 27.
  • This frequency demodulator unit 27 determines the component FM of the frequency modulation from the intermediate frequency signal.
  • This signal is then in turn supplied to the controller unit 23 and can be evaluated by this.
  • the amplitude demodulator unit 25 and the frequency demodulator unit 27 can also be used outside the analysis mode for signal transmission.
  • the Frequenzdemodulatorü 27 can also be used to determine phase relationships and thus to determine the distance between the transmitting and receiving units 5, 7.
  • the controller unit 23 may also relate the amplitude demodulated signals and the frequency demodulated signals to each other. If the control unit 23 detects, for example, as shown in FIG. 3, that the temporal frequency of the amplitude-demodulated signal is twice as long as the time-frequency of the frequency-demodulated signal, it can be assumed that within the Bandwidth .DELTA.f of admirs ⁇ channel is a maximum or minimum of the amount of System ⁇ transfer function S (f) is located. By evaluating the phase relationship between these two signals, further conclusions can be drawn on the course of the amount of the system transfer function S (f).
  • the course of the amount of the system transfer function S (f) can also be determined directly by using an analysis transmission signal which is changed continuously or stepwise in its carrier frequency and at the location of the transmitting transmission and transmission Empfangsan ⁇ antenna has a constant signal strength.
  • the receiving transmitting and receiving unit can then determine the signal strength at the location of the receiving transmitting and receiving antenna.
  • the course of the amount of the system transfer function S (f) which can be determined in this way can then be evaluated with regard to its curvature or the occurrence of maxima and minima, wherein in particular the occurrence of maxima and minima are typical for the presence of multipath reception ,
  • a differentiation of the frequency-dependent course of the amount of the system transfer function S (f) can also be used in this case. and the maximum and minimum values of the differentiated curve within the channel bandwidth ⁇ f are determined. This value can be used as a reliability factor.
  • the invention thus makes it possible to detect impermissibly large distortions of the system transmission function of the wireless transmission path and to determine a reliability factor for evaluating the correctness of the result for a distance determination which is carried out using phase information of a transmitted signal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

La présente invention concerne un système de communication à fréquence porteuse sans fil, en particulier un système de contrôle d'autorisation d'accès pour une automobile. Selon cette invention, la distance entre deux unités d'émission et de réception est déterminée au moyen de l'évaluation d'informations de phase de signaux transmis, puis un facteur de fiabilité est déterminé pour estimer l'exactitude du résultat pour la détermination de distance. Ce facteur de fiabilité est déterminé grâce à une détection directe ou indirecte de l'allure de la phase et/ou de la valeur de la fonction de transmission du système essentiellement sur toute la largeur du canal.
PCT/EP2005/053298 2004-08-10 2005-07-11 Procede de mesure de distance dans un systeme de communication a frequence porteuse sans fil et systeme de communication a frequence porteuse pour mettre en oeuvre ce procede WO2006018355A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004038836.9 2004-08-10
DE200410038836 DE102004038836A1 (de) 2004-08-10 2004-08-10 Verfahren zur Entfernungsmessung in einem drahtlosen Trägerfrequenz-Kommunikationssystem und Trägerfrequenz-Kommunikationssystem zur Durchführung des Verfahrens

Publications (1)

Publication Number Publication Date
WO2006018355A1 true WO2006018355A1 (fr) 2006-02-23

Family

ID=35134361

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/053298 WO2006018355A1 (fr) 2004-08-10 2005-07-11 Procede de mesure de distance dans un systeme de communication a frequence porteuse sans fil et systeme de communication a frequence porteuse pour mettre en oeuvre ce procede

Country Status (2)

Country Link
DE (1) DE102004038836A1 (fr)
WO (1) WO2006018355A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018048821A (ja) * 2016-09-20 2018-03-29 株式会社東海理化電機製作所 電波伝搬距離推定装置
JP2018124181A (ja) * 2017-02-01 2018-08-09 株式会社東海理化電機製作所 電波伝搬距離推定装置

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4670777B2 (ja) * 2006-09-06 2011-04-13 株式会社デンソー 車両制御システム
FR2965632B1 (fr) * 2010-10-01 2013-08-30 Commissariat Energie Atomique Telemetre hyperfrequence a commutation de retards
DE102016208072B4 (de) 2016-05-11 2018-08-16 Continental Automotive Gmbh Verfahren und Vorrichtung zur Bestimmung der Signal-Laufzeiten von Signalen zwischen einem ersten Teilnehmer und einem zweiten Teilnehmer, insbesondere zur Bestimmung der Distanz eines Schlüssels zu einem Kraftfahrzeug
US10839627B2 (en) * 2018-03-28 2020-11-17 Denso International America, Inc. Reflective environment detection systems and methods
FR3101157B1 (fr) * 2019-09-24 2021-08-20 Valeo Comfort & Driving Assistance Mesure de distance basée sur phase avec temps d’acquisition constant
FR3101158B1 (fr) * 2019-09-24 2021-08-27 Valeo Comfort & Driving Assistance Mesure de distance basée sur phase avec application de gain constant
FR3101161B1 (fr) * 2019-09-24 2021-08-27 Valeo Comfort & Driving Assistance Mesure de distance basée sur phase et temps de parcours

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19946161A1 (de) * 1999-09-27 2001-04-26 Siemens Ag Verfahren zur Abstandsmessung
DE10012113A1 (de) * 2000-03-13 2001-10-04 Siemens Ag Verfahren und Vorrichtung zur Datenübertragung und/oder Abstandsmessung zwischen einer Basiseinheit und einer mobilen Schlüsseleinheit eines Zugangsberechtigungskontrollsystems, insbesondere für Kraftfahrzeuge
DE10249866A1 (de) * 2002-10-25 2004-05-13 Siemens Ag Verfahren und Vorrichtung zur Positionsbestimmung wenigstens einer zweiten Sende- und Empfangseinrichtung bezüglich einer ersten Sende- und Empfangseinrichtung in einem GHz-Bereich arbeitenden passiven Zugangskontrollsystem

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10161507A1 (de) * 2001-12-14 2003-07-03 Austriamicrosystems Ag Kommunikationssystem mit einem ersten und einem zweiten Sendeempfänger und Verfahren zu dessen Betrieb

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19946161A1 (de) * 1999-09-27 2001-04-26 Siemens Ag Verfahren zur Abstandsmessung
DE10012113A1 (de) * 2000-03-13 2001-10-04 Siemens Ag Verfahren und Vorrichtung zur Datenübertragung und/oder Abstandsmessung zwischen einer Basiseinheit und einer mobilen Schlüsseleinheit eines Zugangsberechtigungskontrollsystems, insbesondere für Kraftfahrzeuge
DE10249866A1 (de) * 2002-10-25 2004-05-13 Siemens Ag Verfahren und Vorrichtung zur Positionsbestimmung wenigstens einer zweiten Sende- und Empfangseinrichtung bezüglich einer ersten Sende- und Empfangseinrichtung in einem GHz-Bereich arbeitenden passiven Zugangskontrollsystem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ZEILINGER S ET AL: "Multipath channel characteristics using spectral analysis of the signal power density", IEEE TRANSACTIONS ON BROADCASTING, IEEE INC. NEW YORK, US, vol. 44, no. 4, December 1998 (1998-12-01), pages 527 - 539, XP002239162, ISSN: 0018-9316 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018048821A (ja) * 2016-09-20 2018-03-29 株式会社東海理化電機製作所 電波伝搬距離推定装置
JP2018124181A (ja) * 2017-02-01 2018-08-09 株式会社東海理化電機製作所 電波伝搬距離推定装置

Also Published As

Publication number Publication date
DE102004038836A1 (de) 2006-02-23

Similar Documents

Publication Publication Date Title
WO2006018355A1 (fr) Procede de mesure de distance dans un systeme de communication a frequence porteuse sans fil et systeme de communication a frequence porteuse pour mettre en oeuvre ce procede
EP1109981B1 (fr) Procede pour effectuer un controle d'autorisation d'acces sans cle, et unite de controle d'autorisation d'acces sans cle
DE19957536C2 (de) Diebstahlschutzsystem für ein Kraftfahrzeug und Verfahren zum Betreiben eines Diebstahlschutzsystems
DE102007039599B4 (de) Fahrzeugsteuersystem
DE19922411A1 (de) Radarverfahren zur Messung von Abständen und Relativgeschwindigkeiten zwischen einem Fahrzeug und einem oder mehreren Hindernissen
WO2015032920A1 (fr) Procédé et dispositif de communication permettant de valider un contenu de données d'un signal de communication reçu sans fil, ainsi qu'utilisation dudit dispositif de communication
DE10012113A1 (de) Verfahren und Vorrichtung zur Datenübertragung und/oder Abstandsmessung zwischen einer Basiseinheit und einer mobilen Schlüsseleinheit eines Zugangsberechtigungskontrollsystems, insbesondere für Kraftfahrzeuge
DE10317954A1 (de) Radarvorrichtung
DE10249866A1 (de) Verfahren und Vorrichtung zur Positionsbestimmung wenigstens einer zweiten Sende- und Empfangseinrichtung bezüglich einer ersten Sende- und Empfangseinrichtung in einem GHz-Bereich arbeitenden passiven Zugangskontrollsystem
AT506707B1 (de) Vorrichtung zur berührungslosen abstandsmessung zwischen zwei messstellen
DE19743132C2 (de) Verfahren und Vorrichtung zur Abstandsmessung
EP1556259B1 (fr) Procede de determination de la distance entre deux stations emettrices-receptrices et stations emettrices-receptrices correspondantes
DE10054180A1 (de) Verfahren zur Messung einer Kanallänge
DE19839695C1 (de) Verfahren zum Durchführen einer schlüssellosen Zugangsberechtigungskontrolle sowie schlüssellose Zugangsberechtigungskontrolleinrichtung
EP1549971B1 (fr) Procede de determination de la distance entre deux stations emettrices-receptrices
DE19926234A1 (de) Verfahren zum Durchführen einer schlüssellosen Zugangsberechtigungskontrolle sowie schlüssellose Zugangsberechtigungskontrolleinrichtung
DE102005058041A1 (de) Verfahren zum Betreiben eines Zugangssicherungssystems sowie Zugangssicherungssystem
WO2011000605A1 (fr) Contrôle d'un mélangeur
DE102015203616A1 (de) Multipath Erkennung mittels Vergleich zweier unterschiedlicher GNSS Signalen
DE19839696C2 (de) Verfahren zum Durchführen einer schlüssellosen Zugangsberechtigungskontrolle sowie schlüssellose Zugangsberechtigungskontrolleinrichtung
EP3977163A1 (fr) Procédé pour faire fonctionner un système, et système de détermination de distance et transmission de données au moyen de capteurs radars
EP2064688B1 (fr) Procédé de vérification d'informations
DE102018114986A1 (de) Fahrerassistenzsystem für ein Fahrzeug zur Bestimmung einer relativen Geschwindigkeit anhand einer Signalform eines Sendesignals
DE60101754T2 (de) Telekommunikationsverfahren zur Abstandmessung zwischen mobilen Objekten
DE102017204443A1 (de) Zugüberwachungssystem

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase