EP1428044A1 - Detecteur radar pour courtes distances, a mesure de dephasage - Google Patents

Detecteur radar pour courtes distances, a mesure de dephasage

Info

Publication number
EP1428044A1
EP1428044A1 EP02774333A EP02774333A EP1428044A1 EP 1428044 A1 EP1428044 A1 EP 1428044A1 EP 02774333 A EP02774333 A EP 02774333A EP 02774333 A EP02774333 A EP 02774333A EP 1428044 A1 EP1428044 A1 EP 1428044A1
Authority
EP
European Patent Office
Prior art keywords
radar sensor
surface section
output signal
input signal
movement
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.)
Ceased
Application number
EP02774333A
Other languages
German (de)
English (en)
Inventor
Ralph Schertlen
Yan Venot
Werner Wiesbeck
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.)
Siemens AG
Original Assignee
Siemens AG
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 AG filed Critical Siemens AG
Publication of EP1428044A1 publication Critical patent/EP1428044A1/fr
Ceased 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
    • G01S13/36—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
    • 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
    • G01S13/88—Radar or analogous systems specially adapted for specific applications

Definitions

  • the invention relates to a radar sensor with at least one transmitting device for transmitting an electromagnetic output signal, at least one receiving device for receiving an electromagnetic input signal generated by the output signal on at least one surface section of an object and an evaluation device for determining a relative phase position between the output signal and the input signal.
  • an arrangement with at least one radar sensor and at least one object with at least one surface section is specified.
  • a method for determining a relative distance between the radar sensor and a surface section of an object is also specified.
  • a radar sensor of the type mentioned is known from EP 0 718 637 B1.
  • the transmitting device of the known radar sensor has a transmitting antenna and the receiving device has a receiving antenna.
  • the output signal and the input signal of the radar sensor are each a low frequency signal.
  • a distance between the radar sensor and the surface section can be determined by determining the relative phase position between the output signal and the input signal reflected at the surface section of the object.
  • the low-frequency signal With the help of the low-frequency signal, a resolution of the distance in the centimeter range is possible.
  • the radar sensor for example, the distance to an obstacle when parking a motor vehicle can be determined.
  • the high frequency signal is amplitude modulated with a pulsed low frequency signal. This procedure is relatively complicated.
  • the object of the present invention is to provide a radar sensor which is simpler in comparison to the known prior art, with the aid of which a relative distance from the radar sensor to a surface section of an object can be achieved with a distance resolution in the micrometer range.
  • the object is achieved by a radar sensor with at least one transmitting device for transmitting an electromagnetic output signal, at least one receiving device for receiving an electromagnetic input signal caused by the output signal on at least one surface section of an object and an evaluation device for determining a relative phase position between the output signal and the input signal.
  • the radar sensor is characterized in that the output signal and / or the input signal is a high-frequency signal selected from the range from and including 10 GHz to and including 110 GHz, and the evaluation device is a means for measuring a complex reflection factor of the output signal and the input signal for determining the relative phase position having.
  • an arrangement with at least one such radar sensor and at least one object with at least one surface section is also specified, an absolute distance between the radar sensor and the surface section of the object being selected from the range from 0.001 m up to and including 0, 1 m. An absolute distance of up to 1.0 m is also conceivable.
  • a method for determining a relative distance between the radar sensor and a surface section of an object comprises the following steps: a) sending the output signal of the transmitting device in the direction of the surface section of the object, b) Generate. the input signal from the output signal at the surface section, c) sending the input signal in the direction of the receiving device, d) receiving the input signal by the receiving device, e) determining the relative phase position of the output signal and the input signal by the evaluation device, and f) determining the relative distance between the Radar sensor and the surface section from the relative phase position.
  • the transmitting device and the receiving device each have an antenna for transmitting or receiving electromagnetic radiation in the specified high-frequency range.
  • the transmitting antenna and the receiving antenna can be separate (bistatic measurement).
  • Transmitting antenna and receiving antenna can also be integrated in a single antenna (monostatic measurement).
  • the evaluation device preferably has a measuring device for measuring a complex reflection factor of the output signal and the input signal.
  • the complex reflection factor is measured.
  • the amplitude ratio and in particular the relative phase position of the output signal and the input signal can be determined from the reflection factor.
  • the evaluation device has, for example, an I / Q demodulator, with which a signal up to 0 Hz (standing objects) can be represented in the complex plane.
  • a relative distance between the radar sensor and the surface section of the object can be determined from the relative phase position.
  • the high-frequency signal is preferably selected from the range from 50 GHz up to and including 110 GHz.
  • the high frequency is, for example, 76.5 GHz or 94 GHz. Is conceivable. but also a frequency in the range from 1 GHz to 10 GHz.
  • a distance resolution is particularly selected from the range from 10 ⁇ m up to and including 5 mm.
  • the input signal is an output signal of the transmitting device reflected on the surface section of the object.
  • Generating the input signal from the output signal includes reflection of the output signal at the surface portion of the object.
  • the input signal is the output signal reflected at the surface section (primary radar method).
  • a primary output signal generates a secondary radar signal at the surface section.
  • the secondary radar signal is the received signal that is sent in the direction of the receiving device (secondary radar method).
  • the surface section can be generated by moving the object.
  • the relative distance between the radar sensor and the surface section can be determined during the movement or after the movement, that is to say at a standstill.
  • An absolute distance between the radar sensor and the surface section of the object can be determined with the aid of the determined relative distance.
  • an amount of the movement and / or a direction of the movement and / or a speed of the movement and / or an acceleration of the movement is determined.
  • both static and dynamic measurement data of the object can thus be acquired.
  • the amount of the movement is to be understood as the extent of a movement that may have already been completed. With the amount and direction of loading a position of the object and / or the surface section of the object can be specified.
  • a comparison is made between the determined relative distance between the radar sensor and the object and a standard distance between the radar sensor and the object.
  • the standard distance can be specified.
  • the standard distance is determined by moving the object at least once. Due to the design, the surface of an object, for example the surface of a circumference of a wheel, can have a specific surface geometry. This surface geometry is detected by the one-time movement of the object with the help of the radar sensor. Relative distances between the radar sensor and the surface section are determined. These relative distances are saved and serve as standard distances. A structural change to the object to be measured is not necessary. In the case of an inductive measurement system for the contactless acquisition of dynamic measurement data, for example, at least one measurement variable transmitter would have to be attached to the object.
  • the sensor is a gear, for example.
  • the functionality of the object is concluded on the basis of the comparison of the determined relative distance and the standard distance.
  • the relative distance between the radar sensor and the surface section of the object is continuously determined during the movement of the object. Due to a deviation of the relative distance from the standard distance, a change in the surface section and / or a change in the position of the object and / or the radar sensor can be concluded. If a predetermined tolerance of the deviation of the relative distance is exceeded, a warning signal is generated, for example, which indicates that the object is no longer functional and must be replaced.
  • the movement of the object is selected at least from the group of rotational movement about an axis of rotation of the object and / or flow movement along a flow direction of the object and / or torsional movement about a torsion axis of the object and / or translational movement along a translation direction of the object.
  • the surface section has a marking that can be detected by the radar sensor.
  • the marking is, for example, a trench created in the surface section.
  • the distance between the radar sensor and the surface section changes at the trench, which can have a depth of a few ⁇ . This changes the relative phase position between the output and input signal, which can be detected with the help of the radar sensor.
  • a defined phase position is obtained on the surface section with the marking.
  • the object is preferably selected from the group of flowing material and / or wheel and / or plate and / or disk and / or shaft.
  • the object is a brake disc of a vehicle or the wheel of a rail vehicle.
  • the radar sensor is used, for example, to determine an instantaneous rotational speed of a wheel of the motor vehicle for an anti-lock system in a motor vehicle. This is possible until the wheel comes to a standstill. A deceleration (acceleration) can also be determined. Rotation speed and deceleration of a wheel can be used for dynamic chassis control. An optimal metering of a driving and braking force is possible. In addition, an absolute position of the wheel and its direction of rotation are accessible. This data can be used in a navigation system.
  • the invention also makes it possible, for example, to measure the torsion of the shaft that occurs during operation of a shaft. Thanks to the measuring principle used, it is possible to measure each type of shaft, since no additional measurement transmitter has to be mounted on the shaft, but the existing eccentricity (unbalance) is used. Structural changes to the shaft are not necessary.
  • the radar sensor can be used for waves in the field of mechanical engineering, in a vehicle, a ship or an aircraft.
  • the information about torsion can be used to identify a current load state of the shaft and a driving force source (for example a motor) with regard to an optimization of a
  • the efficiency of a mechanical system can be better used, which benefits a higher level of efficiency.
  • the lifespan of shafts is increased, which lowers the operating costs of a machine with the shaft.
  • By regulating the force driving the shaft it is also possible to dispense with some safety reserve with regard to loading the shaft when designing the shaft.
  • the manufacturing costs of the shaft are reduced.
  • a data log about the lifespan of a shaft can provide information about aging (decreasing stiffness) of the shaft and provide important data for optimizing the shaft.
  • the torsion and play of an entire power transmission line with bearings, shafts, gears, etc. can also be measured without contact.
  • the change in the relative distance can be used to conclude, for example, that the material flow has been interrupted.
  • a surface section of the object or a condition of the surface section can be checked.
  • the object is, for example, a plate or a tool.
  • a deviation of the relative distance from the standard distance can be reduced to
  • the tool is, for example, a milling head with milling cutters.
  • the radar sensor is installed near the milling head. The cutter edges rotate past the radar sensor, with each individual cutter edge generating a characteristic signal. If the cutter edges are defective, irregularities occur in the determined distance. The machine can thus be stopped before a workpiece to be machined is damaged and longer production downtimes result from the machine being at a standstill.
  • contamination for example gluing or gumming, of the surface section of the tool can also be detected.
  • the radar sensor can also determine a change in an amplitude from the output signal to the input signal, for example when the output signal is reflected on the surface section.
  • a measurement mode based on the Doppler principle is also possible, for example for using the radar sensor in the far range.
  • the radar sensor thus represents a multifunctional measuring unit.
  • the invention has the following advantages: •
  • the radar sensor can be used at close range with a high distance resolution.
  • the radar sensor can be used universally.
  • a change in the object can be inferred from a long-term log of the relative distance between the radar sensor and the surface section of the object.
  • Figure 1 shows an arrangement with a radar sensor and brake disc.
  • Figure 2 shows an arrangement with a radar sensor and wheel of a rail vehicle.
  • Figure 3 shows an arrangement for measuring a torsion of a shaft.
  • FIG. 4 shows an arrangement with a radar sensor for material flow monitoring.
  • FIG. 5 shows a method for determining a relative distance between the radar sensor and a surface section of an object.
  • the radar sensor 1 has a transmitting device 2 with a transmitting antenna and a receiving device 4 with a receiving antenna (FIG. 1). With the help of the antennas, an electromagnetic high-frequency signal of 76.5 GHz is transmitted or received.
  • the radar sensor 1 has an evaluation device 6 for determining a relative phase position between the output signal 3 and the input signal 5.
  • the evaluation device 6 has an I / Q demodulator.
  • the radar sensor 1 and an object 7 are arranged to one another in an arrangement 11 such that the output signal 3 is directed at a surface section 8 of the object 7.
  • the output signal 3 of the transmitting device 2 is emitted in the direction of the surface section 8 of the object 7 (FIG. 5, step 50).
  • the output signal 3 is reflected on the surface section 8 (step 51) and transmitted as an input signal 5 in the direction of the receiving device 4 (step 52).
  • the input signal 5 is received there (step 53). Furthermore, the relative phase position of the output signal 3 and the input signal 5 is determined by the evaluation device 6 (step
  • the relative distance 9 between the radar sensor 1 and the surface section 8 of the object 7 is determined on the basis of the determined phase position.
  • the absolute distance 10 can be derived from the relative distance 9.
  • an arrangement 11 for measuring a brake disk 20 of a motor vehicle is specified (FIG. 1).
  • the arrangement 11 consists of the radar sensor 1 and an object 7 in the form of the brake disc 20.
  • the radar sensor is arranged on a brake caliper 25 in such a way that the transmitting antenna and the receiving antenna are directed onto a surface 26 of a circumference of the brake disc 25.
  • the surface 26 of the circumference of the brake disk 25 is the surface section to be measured 8.
  • a direction of propagation of the transmission signal emanating from the transmission antenna is directed radially to the axis of rotation 13 of the brake disc 20.
  • each brake disk 20 has a radius 22 that varies over a full circumference (the angle of rotation 23 is 360 °). With a full revolution, the relative distance 9 and thus also the absolute distance 10 between the radar sensor 1 and the circumferential surface 26 vary Radar sensor 1 is used to detect the varying radius 22 of the brake disc 20. This is achieved with the aid of the determined relative distance 9 and thus also the absolute distance 10 between the radar sensor 1 and the peripheral surface 26 of the brake disc 20.
  • the corresponding angle of rotation 23 can be inferred when determining the relative distance 9.
  • An ambiguity could arise from the fact that several relative angles 9 are assigned to a plurality of rotation angles 23. Since the relative distance 9 can be viewed as a function of the angle of rotation 23, which is repeated periodically with multiple angle of rotation values of 360 °, the ambiguity mentioned can be eliminated. If the relative distance 9 is recorded continuously during a full revolution of the brake disc 20, then by knowing the periodic course of the relative distance 9 over a full passage of the angle of rotation 23 of 360 °, the corresponding angle of rotation 23 can be unequivocally concluded. A current angular position of the brake disk 20 is thus possible by determining the relative distance 9. A position control is independent of the rotational speed of the brake disk 20 and can be carried out until the brake disk 20 comes to a standstill.
  • the determination of the angle of rotation speed that is to say the rotational speed of the brake disk 20 is also possible.
  • the time interval between two successive periodic radii is measured.
  • the acceleration or deceleration can also be inferred from the change in this time interval from one revolution to the next.
  • FIG. 1 An internally ventilated brake disk 20 is shown in FIG.
  • a further periodic signal relating to a phase response between the output signal 3 and the input signal 5 is generated by the ventilation slots 27 and the connecting webs 28.
  • the ventilation slots 27 and connecting webs 28 are markings that the radar sensor can detect. The periodicity resulting from the markings can also be used to determine the measured variables according to the principle described above.
  • an arrangement 11 for monitoring a wheel 18 of a rail vehicle is specified (FIG. 2).
  • the radar sensor 1 To detect a speed of the rail vehicle, the radar sensor 1 is mounted at a short distance from the object 7 in the form of a wheel 18 of a rail vehicle.
  • the radar sensor 1 also serves to check the condition of the wheel 18 or wheel tire.
  • the radar sensor 1 scans the peripheral surface 26 of the wheel 18. Wear, damage 29 or a crack can thus be detected. Wear is recognized by the fact that the determined relative distance 9 has a general drift over the entire circumference in comparison to a standard distance 30 that was recorded when a new wheel was installed. Damage or a crack on the circumference is recognized by the fact that the determined relative distance 9 at the defect 29 has significant jumps that would not occur if the wheel 18 were in perfect condition. The sudden occurrence of such a fault (once or several times per revolution or period) is a clear indication of a defective wheel 18 or a defective wheel tire.
  • the radar sensor 1 is also used to detect bearing damage to the wheel 18.
  • a wheel 18 with a defective bearing 30 has irregularities when rolling. These irregularities are recognized by the radar sensor 1, since the determined relative distance 9 is no longer strictly periodic, but is overlaid by a fault that is attributable to the defective bearing 30. In contrast to a crack, the disturbance does not occur abruptly at the determined distance 9, but grows slowly and decreases just as slowly but irregularly with every rotation.
  • an arrangement 11 for measuring a torsion of a shaft 21 is specified (FIG. 3).
  • an object 7 in the form of a shaft 21 which is intended to transmit a force from a motor 32 to a load 33.
  • the torsion between the measuring points 34 and 35 on the shaft 1 is determined.
  • a distance 38 between these measurement points is determined by the position of the radar sensor 36 and the radar sensor 37.
  • the torsion 12 of the shaft 21 can be viewed as an axial twist 12 of the cross-sectional area of the shaft 21 at the measuring point 34 to the cross-sectional area at the measuring point 35. The relative position of these cross-sectional areas with respect to one another is thus determined.
  • the position of the cross-sectional area of the shaft 21 in the measurement point 34 or in the measurement point 35 is described by the angle of rotation 23 in analogy to the exemplary embodiment 1 for a brake disc.
  • the manufacturing and system-related eccentricity of the shaft 21 is used as an indicator for the angle of rotation 23 of the cross-sectional area of the shaft 21 at the respective measuring point. This is achieved by considering the phase curve of the output signal 3. Since the relative distance 9 of the radar sensor to the moving surface section of the shaft 21 changes when the angle of rotation 23 changes, this is reflected in a change in the electrical length, that is to say the phase relationship of the output signal 3 and the input signal 5 to one another.
  • the periodicity of the eccentricity or irregularity from one revolution to the other can be used to infer the actual instantaneous axial position of the cross-sectional area of the shaft 21 in the measuring point 34 or in the measuring point 35.
  • the random eccentricity or irregularity of the shaft is not used.
  • the surface section of the shaft 21 reflecting the output signal 3 is mechanically machined at the measuring point 34 and at the measuring point 35v in order to achieve a defined one To obtain the phase profile of the signals 3 and 3 during one revolution of the angle of rotation 23.
  • the axial position of the cross-sectional areas in the measuring points is known.
  • the position of the two cross-sectional areas relative to one another can thus be inferred from the difference in the angle of rotation. If the shaft 21 is subject to torsion under load, the cross-sectional areas in the measuring point 34 and in the measuring point 35 will shift relative to one another, which leads to a change in the angle of rotation difference that is detected.
  • This angle of rotation difference which is a direct measure of the torsion, can be measured in the static state of the shaft, but also in the case of a rotating shaft.
  • an arrangement 11 with radar sensor 1 for material flow and material thickness monitoring is specified (FIG. 4).
  • the radar sensor 1 When using the radar sensor 1 for material thickness monitoring, the radar sensor 1 is mounted at a slight absolute distance 10 from the flowing material 17 or a plate 19. The flowing material 17 is moved in the flow direction 15 starting from a flow production machine. The plate 19 is moved in the translation direction 16. The orientation of the radar sensor is perpendicular to the direction in which a thickness fluctuation 41 is to be detected. The fluctuation in thickness 41 causes a change in the relative distance 9 between the radar sensor 1 and the surface section 8. A larger width of the object 7 can be monitored by arranging a plurality of radar sensors 1 next to one another.
  • the radar sensor 1 When using the radar sensor 1 for material flow monitoring, the radar sensor 1 is at a short distance 10 from the surface. Chen section 8 of an object 7 mounted in the form of a flowing material 17. If the flow of material is interrupted 39, the radar sensor 1 no longer receives a signal reflected by the surface section 8 of the material 17, so that only noise is present at the output of the radar sensor 1. This can be seen as an interruption 39.

Abstract

L'invention concerne un détecteur radar (1) comportant au moins un dispositif d'émission (2) pour émettre un signal de sortie (3) électromagnétique, au moins un dispositif de réception (4) pour recevoir un signal d'entrée (5) électromagnétique provoqué par le signal de sortie sur au moins une section superficielle (8) d'un objet (7), ainsi qu'un dispositif d'évaluation (6) pour déterminer une position de phase relative entre le signal de sortie et le signal d'entrée. Ledit détecteur radar se caractérise en ce que le signal de sortie et/ou le signal d'entrée est/sont un signal haute fréquence sélectionné dans la plage allant de 10 GHz compris à 110 GHz compris. L'invention concerne en outre un système (11) comportant au moins un détecteur radar de ce type et au moins un objet présentant au moins une section superficielle. Une distance absolue (10) entre le détecteur radar et la section superficielle de l'objet est sélectionnée dans la plage allant de 0,001 m compris à 0,1 m compris. L'invention concerne en outre un procédé permettant de déterminer une distance relative (9) entre le détecteur radar et la section superficielle de l'objet. Ledit détecteur radar s'utilise de manière universelle pour les courtes distances, avec une haute résolution de distance de l'ordre de 10 à 5 νm et peut s'utiliser pour le contrôle d'épaisseurs de matériaux et le contrôle de flux de matières, ainsi que pour déterminer des données statiques et dynamiques d'un corps de rotation, par exemple d'une roue ou d'un arbre.
EP02774333A 2001-09-21 2002-09-11 Detecteur radar pour courtes distances, a mesure de dephasage Ceased EP1428044A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10146586 2001-09-21
DE10146586 2001-09-21
PCT/DE2002/003384 WO2003027709A1 (fr) 2001-09-21 2002-09-11 Detecteur radar pour courtes distances, a mesure de dephasage

Publications (1)

Publication Number Publication Date
EP1428044A1 true EP1428044A1 (fr) 2004-06-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02774333A Ceased EP1428044A1 (fr) 2001-09-21 2002-09-11 Detecteur radar pour courtes distances, a mesure de dephasage

Country Status (2)

Country Link
EP (1) EP1428044A1 (fr)
WO (1) WO2003027709A1 (fr)

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DE10334429A1 (de) * 2003-07-28 2005-03-10 Siemens Ag Vorrichtung zum Senden und/oder Empfangen elektromagnetischer Wellen und Verwendung der Vorrichtung
DE102009005745B4 (de) 2009-01-23 2011-09-01 Ott-Jakob Spanntechnik Gmbh Vorrichtung zur Überwachung der Lage eines Werkzeugs oder Maschinenelements
DE102010011470B9 (de) 2010-03-09 2016-09-29 Nagel Maschinen- Und Werkzeugfabrik Gmbh Verfahren und Vorrichtung zur messungsunterstützten Feinbearbeitung von Werkstückoberflächen sowie Messsystem
WO2016116098A1 (fr) * 2015-01-22 2016-07-28 Fachhochschule Aachen Dispositif de mesure et de surveillance de grandeurs liées aux pneumatiques pour un véhicule
DE102016101595A1 (de) * 2016-01-29 2017-08-03 Infineon Technologies Ag Verfahren und Vorrichtungen für eine Geschwindigkeits- und/oder Positionserfassung
DE102017223661A1 (de) * 2017-12-22 2019-06-27 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Überprüfung eines Bearbeitungsprozesses
DE102022113728A1 (de) 2022-05-31 2023-11-30 OndoSense GmbH Verfahren zur Messung von Abstandsänderungen zu einem Messobjekt

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DE4125624C2 (de) * 1990-11-29 1994-07-21 Rohde & Schwarz Verfahren zum Kalibrieren eines Netzwerkanalysators
DE4117158A1 (de) * 1991-05-25 1992-11-26 Telefunken Systemtechnik Beruehrungsloser abstandsmesssensor
JP3294726B2 (ja) * 1994-12-20 2002-06-24 本田技研工業株式会社 レーダ装置
DE19754720C2 (de) * 1997-12-10 2000-12-07 Adc Automotive Dist Control Verfahren zum Betrieb eines Radarsystems
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