DE4327937A1 - Device for determining the geometrical position (orientation) of object points - Google Patents

Device for determining the geometrical position (orientation) of object points

Info

Publication number
DE4327937A1
DE4327937A1 DE19934327937 DE4327937A DE4327937A1 DE 4327937 A1 DE4327937 A1 DE 4327937A1 DE 19934327937 DE19934327937 DE 19934327937 DE 4327937 A DE4327937 A DE 4327937A DE 4327937 A1 DE4327937 A1 DE 4327937A1
Authority
DE
Germany
Prior art keywords
devices
button
transmitter
electromagnetic radiation
probe tip
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.)
Withdrawn
Application number
DE19934327937
Other languages
German (de)
Inventor
Peter Dipl Ing Nimz
Ewald Dipl Ing Wagner
Ralf Dipl Ing Meyer
Michael Boehm
Ubbo Dipl Ing Benter
Horst Dipl Ing Ringel
Juergen Dipl Ing Raschke
Rolf Susenburger
Bernhard Dipl Ing Maege
Bjoern Dipl Ing Kirkerowitz
Wolfgang Dipl Ing Riechmann
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.)
Volkswagen AG
Original Assignee
Volkswagen 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 Volkswagen AG filed Critical Volkswagen AG
Priority to DE19934327937 priority Critical patent/DE4327937A1/en
Publication of DE4327937A1 publication Critical patent/DE4327937A1/en
Withdrawn legal-status Critical Current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
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/06—Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements
    • 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
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0247—Determining attitude
    • 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
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/16—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using electromagnetic waves other than radio waves
    • G01S5/163—Determination of attitude

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

A device for determining the geometrical position of object points (1), for example during the manufacture of parts, contains appliances (15, 16 and 17) which are arranged in a fixed position in the region of the ceiling (14) of a room as well as a probe (4) for scanning the respective object point (1). The appliances (15, 16, 17) or the probe (4) are designed as transmitters and the other arrangements in each case are designed as receivers for electromagnetic radiation. The coordinates of the respective object point (1) are determined using the propagation time principle (delay time principle) (Fig. 1). <IMAGE>

Description

Die Erfindung betrifft eine Einrichtung gemäß dem Oberbegriff des Patentanspruchs 1. Derartige Einrichtungen erfassen also die Laufzeiten elektromagnetischer Strahlung zwischen dem je­ weiligen Objektpunkt und den ortsfesten Vorrichtungen, deren Lage bekannt ist; aus den Laufzeitdifferenzen lassen sich dann die in der Regel dreidimensionalen Koordinaten des betreffen­ den Objektpunkts ermitteln.The invention relates to a device according to the preamble of claim 1. Such devices thus capture the transit times of electromagnetic radiation between each because of the object point and the fixed devices whose Location is known; from the maturity differences can then which usually concern three-dimensional coordinates of the determine the object point.

Bekannte Einrichtungen dieser Art erfordern besondere Meß­ stände, die die Anwendung der betreffenden Einrichtung bei­ spielsweise an einer Fertigungsstraße erschweren.Known devices of this type require special measuring would support the application of the facility in question for example on a production line.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Einrichtung unter Wahrung ihrer Vorteile zu schaffen, die aus dem Vorsehen definierter Meßstände resultierende Schwierigkei­ ten, insbesondere hinsichtlich der Anwendung in der Fertigung, vermeidet.The invention has for its object a generic Establish facility while preserving its benefits Difficulty resulting from the provision of defined measuring stands ten, especially with regard to the application in manufacturing, avoids.

Die erfindungsgemäße Lösung dieser Aufgabe besteht in den kennzeichnenden Merkmalen des Patentanspruchs 1, vorteilhafte Ausbildungen der Erfindung beschreiben die Unteransprüche.The inventive solution to this problem consists in the characterizing features of claim 1, advantageous Developments of the invention describe the subclaims.

Erfindungsgemäß ist also kein besonderer Meßstand vorgesehen, sondern die ortsfesten Vorrichtungen sind in definierten Lagen im Deckenbereich des jeweiligen Raumes, z. B. einer Ferti­ gungshalle, angeordnet. Zusätzlich zu diesen Vorrichtungen umfaßt die erfindungsgemäße Einrichtung einen Taster, der zum mechanischen Abtasten der Position des jeweiligen Objektpunkts eingerichtet, also in der Regel mit einer Tastspitze ausgerü­ stet ist. Die ortsfesten Vorrichtungen, deren Lage also bei der Lösung aller Meßaufgaben dieselbe ist, können als Sender für elektromagnetische Strahlung (sichtbare oder unsichtbare) ausgebildet sein; dann bildet der Taster einen Empfänger; um­ gekehrt ist es aber auch möglich, die definierten Vorrichtun­ gen als Empfänger auszubilden und den Taster als Sender.According to the invention, no special measuring stand is provided,  but the fixed devices are in defined positions in the ceiling area of the respective room, e.g. B. a ferti supply hall, arranged. In addition to these devices the device according to the invention comprises a button which for mechanical scanning of the position of the respective object point set up, usually equipped with a probe tip is steady. The fixed devices, so their location at the solution of all measurement tasks is the same, can be used as a transmitter for electromagnetic radiation (visible or invisible) be educated; then the button forms a receiver; um however, it is also possible to reverse the defined device training as a receiver and the button as a transmitter.

Es versteht sich von selbst, daß beispielsweise mittels eines Steuerrechners für eine Synchronisierung des Betriebs der Vor­ richtungen und des Senders bzw. Empfängers im Taster gesorgt werden muß.It goes without saying that, for example, by means of a Control computer for synchronizing the operation of the pre directions and the transmitter or receiver in the button must become.

Zwei Ausführungsbeispiele der Erfindung werden im folgenden anhand der Zeichnung erläutert. In beiden Figuren derselben ist angenommen, daß der Taster als Sender ausgebildet ist, also die ortsfesten Vorrichtungen Empfänger darstellen.Two embodiments of the invention are as follows explained using the drawing. In both figures the same it is assumed that the button is designed as a transmitter, So the fixed devices represent receivers.

Betrachtet man zunächst Fig. 1, so ist bei 1 ein hinsichtlich seiner Koordinaten zu erfassender Objektpunkt des zu vermes­ senden Objekts 2 von der Tastspitze 3 des allgemein mit 4 be­ zeichneten, beispielsweise von Hand gehaltenen Tasters be­ rührt. Der Taster 4 enthält in dem Gehäuse 5 längs der auch die Tastspitze 3 und damit den Objektpunkt 1 enthaltenden Achse 6 zwei Sender 7 und 8 für elektromagnetische Strahlung, deren Sendekeulen 9 und 10 (Abstrahlungscharakteristika) eben­ falls längs der Achse 6 verlaufen. Der untere Sender 7 befin­ det sich in einem definierten Abstand D von der Tastspitze 3 und damit dem jeweiligen Objektpunkt 1.Looking first at Fig. 1, 1 with respect to its coordinates to be detected object point of the object to be measured 2 from the probe tip 3 of the 4 generally designated, for example hand-held button be touched. The button 4 contains in the housing 5 along the axis 6, which also contains the probe tip 3 and thus the object point 1 , two transmitters 7 and 8 for electromagnetic radiation, the transmission lobes 9 and 10 (radiation characteristics) of which also run along the axis 6 . The lower transmitter 7 is located at a defined distance D from the probe tip 3 and thus the respective object point 1 .

Das Gehäuse 5 ist mit der Auslösetaste 11 versehen, deren Aus­ gangssignal sowohl den Sendern 7 und 8 als auch über die Lei­ tung 12 dem Steuerrechner 13 zugeführt wird, der zur Synchro­ nisierung der Arbeitsweisen der hier als Empfänger ausgeführ­ ten, an der Decke 14 der Meßhalle befestigten ortsfesten Vor­ richtungen 15, 16 und 17 dient.The housing 5 is provided with the release button 11 , the output signal from both the transmitters 7 and 8 and via the Lei device 12 is fed to the control computer 13 , which for synchronization of the modes of operation here executed as a receiver, on the ceiling 14 of the Measurement hall fixed fixed before devices 15 , 16 and 17 is used.

Die von dem Taster 4 emittierte, durch Funkenpfeile angedeu­ tete Strahlung wird in den Vorrichtungen 15, 16 und 17 nach Laufzeiten, d. h. in zeitlichen Abständen vom Zeitpunkt ihrer Aussendung, empfangen, die (da der Senderabstand D bekannt ist) ein Maß für den jeweiligen Abstand von dem Objektpunkt 1 darstellen. Daher kann aus den in den Vorrichtungen 15, 16 und 17 ermittelten Laufzeiten die räumliche Lage des betreffenden Objektpunkts 1 ermittelt werden.The radiation emitted by the button 4 , indicated by spark arrows, is received in the devices 15 , 16 and 17 after running times, ie at time intervals from the time of their transmission, which (since the transmitter distance D is known) is a measure of the respective distance from object point 1 . The spatial position of the object point 1 in question can therefore be determined from the transit times determined in the devices 15 , 16 and 17 .

In der Ausführungsform nach Fig. 2 ist der gerade zu vermes­ sende Objektpunkt des Objekts 20 mit 21 bezeichnet. Hier ent­ hält der allgemein mit 22 bezeichnete Taster den beispiels­ weise wiederum als Sender ausgebildeten Taststift 23, der ei­ nenends mit der Tastspitze 24 und anderenends mit der Träger­ platte 25 für in diesem Ausführungsbeispiel drei in einer Ebene liegende Lichtquellen (Dioden) 26, 27 und 28 versehen ist. Der Abstand D′ zwischen Tastspitze 24 und Platte 25 ist wieder definiert, d. h. er ist konstant.In the embodiment according to FIG. 2, the object point of the object 20 to be measured is designated 21 . Here ent contains the button generally designated 22 , for example as a transmitter stylus 23 , the egg nends with the probe tip 24 and the other end with the carrier plate 25 for three in this embodiment light sources (diodes) 26 , 27 and 28 is provided. The distance D 'between probe tip 24 and plate 25 is defined again, ie it is constant.

Wiederum sind an der Hallendecke 29 drei als Empfänger ausge-­ bildete Vorrichtungen 30, 31 und 32 in definierten, konstanten Lagen angeordnet. Der jeweilige Meßvorgang wird durch Betäti­ gen des Auslösers 33 initiiert, der sowohl die Sender, also die Dioden 26, 27 und 28, als auch über den Steuerrechner 34 die Empfänger in den Vorrichtungen 30, 31 und 32 aktiviert. Auch hier erfolgt die Ermittlung der Position des Objektpunkts 21 über die Laufzeiten der Strahlung zwischen den Sendern 26, 27 und 28 einerseits und den Empfängern 30, 31 und 32 anderer­ seits. Again, three devices 30 , 31 and 32 designed as receivers are arranged in defined, constant positions on the hall ceiling 29 . The respective measuring process is initiated by actuating the trigger 33 , which activates both the transmitters, that is to say the diodes 26 , 27 and 28 , and also via the control computer 34, the receivers in the devices 30 , 31 and 32 . Here, too, the position of the object point 21 is determined via the transit times of the radiation between the transmitters 26 , 27 and 28 on the one hand and the receivers 30 , 31 and 32 on the other hand.

Nochmals sei darauf hingewiesen, daß die Lage von Sendern und Empfängern verständlicherweise auch ausgetauscht werden kann. Auch bietet die Erfindung weitgehende Freiheit hinsichtlich der Ausführung einzelner Bauelemente. So kann zur Vergrößerung der Laufzeiten und damit zur Erhöhung der Meßgenauigkeit bei­ spielsweise der Taster einen Reflektor für in den ortsfesten Vorrichtungen erzeugte Strahlung enthalten, die dann ihrer­ seits als kombinierte Sender/Empfänger ausgebildet sind.Again, it should be noted that the location of transmitters and Recipients can understandably also be exchanged. The invention also offers extensive freedom with regard to the execution of individual components. So can enlarge the running times and thus to increase the measuring accuracy for example the push button a reflector for in the stationary Devices contain radiation that is then their are trained as a combined transmitter / receiver.

Claims (5)

1. Einrichtung zur Bestimmung der geometrischen Lage von Ob­ jektpunkten über elektromagnetisch nach dem Laufzeitprin­ zip erfolgende Ermittlung der Abstände zwischen dem jewei­ ligen Objektpunkt und mehreren definierte Koordinatenwerte aufweisenden, ortsfesten Vorrichtungen in einem Raum, da­ durch gekennzeichnet, daß die Vorrichtungen (15, 16, 17) raumfest angeordnet sind und ein längs der Objektoberflä­ che bewegbarer Taster (4) vorgesehen ist, wobei dieser oder die Vorrichtungen (15, 16, 17) als Sender für elek­ tromagnetische Strahlung und die Vorrichtungen (15, 16, 17) bzw. der Taster (4) als Empfänger für die elektroma­ gnetische Strahlung ausgebildet sind.1.Device for determining the geometric position of object points via electromagnetic determination of the distances between the respective object point and a plurality of fixed coordinate devices having fixed coordinate values in a room, as characterized in that the devices ( 15 , 16 , 17 ) are arranged fixed in space and a movable button ( 4 ) along the object surface is provided, this or the devices ( 15 , 16 , 17 ) as a transmitter for electromagnetic radiation and the devices ( 15 , 16 , 17 ) or the Pushbuttons ( 4 ) are designed as receivers for electromagnetic radiation. 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Vorrichtungen (15, 16, 17) im Bereich der Decke (14) des Raumes angeordnet sind.2. Device according to claim 1, characterized in that the devices ( 15 , 16 , 17 ) are arranged in the region of the ceiling ( 14 ) of the room. 3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeich­ net, daß der Taster (4) in einem einenends mit einer Tast­ spitze (3) versehenen Gehäuse (5) auf einer Achse (6) zu­ mindest zwei Sender (7, 8) für elektromagnetische Strah­ lung enthält, deren Sendekeulen (9, 10) auf der Achse (6) liegen und etwa in Richtung auf die Vorrichtungen (15, 16, 17) weisen, wobei der Abstand (D) zwischen der ebenfalls auf der Achse (6) liegenden Tastspitze (3) und dem benach­ barten Sender (7) definiert ist. 3. Device according to claim 1 or 2, characterized in that the button ( 4 ) in a one end with a probe tip ( 3 ) provided housing ( 5 ) on an axis ( 6 ) to at least two transmitters ( 7 , 8 ) for contains electromagnetic radiation, whose transmission lobes ( 9 , 10 ) lie on the axis ( 6 ) and point approximately in the direction of the devices ( 15 , 16 , 17 ), the distance (D) between the likewise on the axis ( 6 ) lying probe tip ( 3 ) and the neighboring transmitter ( 7 ) is defined. 4. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeich­ net, daß der Taster (22) einen einenends mit einer Tast­ spitze (24) und anderenends mit einem querverlaufenden Träger (25) für mehrere Lichtquellen (26, 27, 28) versehe­ nen Taststift (23) enthält, wobei der Abstand (D′) zwi­ schen Tastspitze (24) und Träger (25) definiert ist.4. Device according to claim 1 or 2, characterized in that the button ( 22 ) one end with a probe tip ( 24 ) and the other end with a transverse carrier ( 25 ) for several light sources ( 26 , 27 , 28 ) provide a stylus ( 23 ) contains, the distance (D ') between rule's tip ( 24 ) and carrier ( 25 ) is defined. 5. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeich­ net, daß der Taster als Reflektor, dagegen die ortsfesten Vorrichtungen als kombinierte Sender/Empfänger ausgebildet sind.5. Device according to claim 1 or 2, characterized net that the button as a reflector, whereas the stationary Devices designed as a combined transmitter / receiver are.
DE19934327937 1993-08-19 1993-08-19 Device for determining the geometrical position (orientation) of object points Withdrawn DE4327937A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19934327937 DE4327937A1 (en) 1993-08-19 1993-08-19 Device for determining the geometrical position (orientation) of object points

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19934327937 DE4327937A1 (en) 1993-08-19 1993-08-19 Device for determining the geometrical position (orientation) of object points

Publications (1)

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DE4327937A1 true DE4327937A1 (en) 1995-02-23

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19631623A1 (en) * 1996-08-05 1998-02-12 Siemens Ag Arrangement for one- or multi-dimensional determination of the position of a load suspension point in hoists
WO1998011405A1 (en) * 1996-09-16 1998-03-19 Brewco Measuring device primarily for use with vehicles
WO1998028632A1 (en) * 1996-12-24 1998-07-02 Kuka Schweissanlagen Gmbh Method and device to measure and check workpieces
EP0879396A1 (en) * 1996-02-07 1998-11-25 Visidyne, Inc. Optical measurement system
EP1016872A1 (en) * 1998-12-30 2000-07-05 Commissariat A L'energie Atomique Method and device to determine the position of at least one emitter of pulsed signals
WO2001084076A1 (en) * 2000-04-28 2001-11-08 Carl Zeiss Co-ordinate measuring device or machine tool
DE10041108A1 (en) * 2000-08-22 2002-03-14 Siemens Ag System for determining location of data processing device relative to object, e.g. for automation or production system by evaluating propagation time from transmitters
DE10054282A1 (en) * 2000-11-02 2002-05-29 Abatec Electronic Ag Regau Method and device for determining the position, orientation and / or deformation of an object
WO2006059032A1 (en) * 2004-12-02 2006-06-08 Commissariat A L'energie Atomique Local positioning system and method
WO2006119764A1 (en) * 2005-05-13 2006-11-16 Brüel & Kjær Sound & Vibration Measurement A/S Determination of the position of an object
DE102005028786A1 (en) * 2005-06-22 2007-02-15 Volkswagen Ag Measuring system for measurement of motor vehicle or part of motor vehicle, has three receiving devices for receiving radio signals and has evaluation device for determination of position of point of measuring head depending on radio signal
DE102006006682B4 (en) * 2005-07-20 2017-03-02 Volkswagen Ag Measuring system for measuring a motor vehicle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0152905A2 (en) * 1984-02-21 1985-08-28 Travenol GmbH Method and device for localizing measuring points using ultrasonic pulses

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0152905A2 (en) * 1984-02-21 1985-08-28 Travenol GmbH Method and device for localizing measuring points using ultrasonic pulses

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0879396A4 (en) * 1996-02-07 2000-02-02 Visidyne Inc Optical measurement system
EP0879396A1 (en) * 1996-02-07 1998-11-25 Visidyne, Inc. Optical measurement system
DE19631623A1 (en) * 1996-08-05 1998-02-12 Siemens Ag Arrangement for one- or multi-dimensional determination of the position of a load suspension point in hoists
US6229473B1 (en) 1996-08-05 2001-05-08 Siemens Aktiengesellschaft Arrangements for the one-dimensional or multi-dimensional determination of the position of a load suspension point in hoists
DE19631623C2 (en) * 1996-08-05 1999-01-14 Siemens Ag Device for determining the position of a load pick-up in hoists
AU739822B2 (en) * 1996-09-16 2001-10-18 Snap-On Technologies, Inc. Measuring device primarily for use with vehicles
US6115927A (en) * 1996-09-16 2000-09-12 Brewco, Inc. Measuring device primarily for use with vehicles
WO1998011405A1 (en) * 1996-09-16 1998-03-19 Brewco Measuring device primarily for use with vehicles
WO1998028632A1 (en) * 1996-12-24 1998-07-02 Kuka Schweissanlagen Gmbh Method and device to measure and check workpieces
FR2788134A1 (en) * 1998-12-30 2000-07-07 Commissariat Energie Atomique METHOD FOR DETERMINING THE POSITION OF AT LEAST ONE IMPULSE SIGNAL TRANSMITTER AND DEVICE EMPLOYING THE METHOD
EP1016872A1 (en) * 1998-12-30 2000-07-05 Commissariat A L'energie Atomique Method and device to determine the position of at least one emitter of pulsed signals
US6806968B2 (en) 2000-04-28 2004-10-19 Carl-Zeiss Stiftung Apparatus and method for measuring a workpiece
WO2001084076A1 (en) * 2000-04-28 2001-11-08 Carl Zeiss Co-ordinate measuring device or machine tool
DE10041108A1 (en) * 2000-08-22 2002-03-14 Siemens Ag System for determining location of data processing device relative to object, e.g. for automation or production system by evaluating propagation time from transmitters
DE10054282A1 (en) * 2000-11-02 2002-05-29 Abatec Electronic Ag Regau Method and device for determining the position, orientation and / or deformation of an object
WO2006059032A1 (en) * 2004-12-02 2006-06-08 Commissariat A L'energie Atomique Local positioning system and method
FR2878965A1 (en) * 2004-12-02 2006-06-09 Commissariat Energie Atomique SYSTEM AND METHOD FOR LOCAL POSITIONING
WO2006119764A1 (en) * 2005-05-13 2006-11-16 Brüel & Kjær Sound & Vibration Measurement A/S Determination of the position of an object
DE102005028786A1 (en) * 2005-06-22 2007-02-15 Volkswagen Ag Measuring system for measurement of motor vehicle or part of motor vehicle, has three receiving devices for receiving radio signals and has evaluation device for determination of position of point of measuring head depending on radio signal
DE102006006682B4 (en) * 2005-07-20 2017-03-02 Volkswagen Ag Measuring system for measuring a motor vehicle

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