Method for acquiring quality-related information about radio connections

Abstract

The invention relates to a method for the spatially resolved acquisition of quality-related information regarding wireless communication connections, wherein a test object is arranged at a spatial position and has a test object communication unit for wireless communication. A camera is directed to the test object and captures the test object and an adjacent surrounding space as a spatial measurement region. A mobile, remotely controllable measuring device with markings that can be detected by the camera is arranged in the spatial measurement region. The measuring device is coupled to a measuring device communication unit, which is designed to communicate wirelessly with the test object communication unit. The image data from the camera is read to determine the position of the remotely controllable measuring device, and a quality value of the wireless communication connection between the measuring device communication unit and the test object communication unit is acquired and stored.

Description

[0001] Procedure for collecting quality information on radio links

[0002] The application relates to a method for acquiring quality information from wireless communication links. In particular, the application relates to a method for spatially resolved acquiring quality information from wireless communication links, wherein a measurement object is fixedly arranged at a first spatial position and the measurement object has at least one first measurement object communication device for wireless communication.

[0003] Wireless communication is used in technology primarily for the transmission of user data. Data exchange is highly dependent on the quality of the radio connection. In areas where wireless communication is to take place, the best possible communication connection must be ensured through unhindered transmission of electromagnetic waves between the communication participants.

[0004] In addition, other communication data, e.g., signal strength, can also be used to determine the position of a communication participant. The position is determined as the relative position between the communicating devices. In connection with wireless or radio communication, it is sometimes very important to also determine the position of the communication participants. Particularly in the area of ​​security-relevant communication, e.g., payment transactions via wireless communication channels or access systems, it may happen that certain functions are only available if the position of a communication participant fulfills certain conditions.

[0005] In the area of ​​NFC communication, which has a range of only a few centimeters, this function is relevant, for example, for payment. When providing access systems that monitor access or entry authorization to physical entities such as buildings or vehicles, it is also advantageous if access to facilities or functions is only granted when a request for the function is made from a specific location.

[0006] Such concepts are particularly well known from automotive technology, where wireless access systems are used. Proprietary vehicle keys are also increasingly being replaced by general communication devices, especially smartphones. In order to guarantee vehicle security at all times, the position information of a user in relation to the vehicle will always be relevant for access and authorization systems based on such communication devices. The radio technologies used today in vehicles, in particular low frequency radio (LF), high frequency radio (HF) and the NFC, Bluetooth and UWB standards, offer different ranges and capabilities for determining positions. For each specific radio standard used, these systems are highly dependent on the arrangement of corresponding transmitting and receiving devices on the vehicle as well as on the vehicle geometry and design.

[0007] For the design and testing of systems in which the positional relationships of the communication participants are relevant, it is therefore important to obtain reliable information about the dependence of the parameters and quality of a communication connection on the position and orientation of the communication participants relative to one another. For positioning, it is less the data actually exchanged than quality information that is crucial. Quality information here refers to all information that provides information about the quality of a communication connection, in particular the received signal strengths or the stability of the connection during data transmission.

[0008] Automated and semi-automated measurement systems are known, for example, from automotive engineering to record quality information about radio connections. For example, for the specific measurement of vehicle access systems, rail systems are constructed on which measurement setups can be moved to record the radio connection at predefined positions.

[0009] From areas outside of automotive engineering, measuring robots are known that move around a space to be measured and collect measurement data. Finally, measuring drones are also known that can measure electromagnetic fields in three dimensions.

[0010] The known systems vary in their susceptibility to failure. For example, in measurement drones, the operating components influence the measurements required for the drone's flight. Furthermore, the use of such systems is limited by battery life, and positioning often does not achieve the accuracy required for sufficiently precise measurements.

[0011] The object of the invention is to provide an improved method that enables a needs-based spatial resolution for detecting quality information from wireless communication links of any type. This object is achieved by a method having the features of claim 1.

[0012] The method according to the invention of the type mentioned at the outset uses a camera which is fixed in place at a distance from the measuring object and is aimed at the measuring object. The camera is aligned with its field of view in such a way that the measuring object and at least one spatial region adjacent to the measuring object are recorded as the spatial measuring area. This spatial measuring area (also measuring field) is an area in which quality information is to be recorded via the wireless communication link between the measuring object and a measuring device. A mobile, remote-controllable and ground-movable measuring device is placed in the spatial measuring area (measuring field). This measuring device is provided with markings which can be recorded by the camera. The markings can be natural or artificial.Natural markings are characteristic, visually recognizable features of the measuring device itself, which can be identified by an image recognition system when evaluating the image data captured by the camera. Artificial markings are additional, visually or otherwise technically detectable information that serves exclusively the purpose of marking recognition and has no other constructive function on the measuring device.

[0013] The mobile, remote-controlled, and ground-movable measuring device has a mount coupled to a measuring device communication device. This measuring device communication device is designed for wireless communication with the measurement object communication device. In principle, any communication-capable system can be considered as a measuring device communication device, e.g., sensor devices designed for measurement analysis or transmitting and receiving devices. In particular, commercially available communication devices such as smartphones, vehicle keys for wireless access systems, and other communication-capable mobile devices are also suitable.

[0014] A control and evaluation device for data transmission is coupled to the camera, the measurement object communication device, and the measuring device itself. The control and evaluation device coordinates the positioning of the measuring device relative to the measurement object depending on the data supplied by the camera. The system can be operated in such a way that the control and evaluation device supplies the mobile, remote-controllable measuring device with specific control commands to move to a specific measuring position, or that the control and evaluation device supplies the mobile, remote-controllable measuring device with information that it determines from the image data of the camera, and the mobile, remote-controllable measuring device itself has control capabilities that move to specific measuring positions depending on this information.

[0015] The camera's image data is read by the control and evaluation device, and the position of the remotely controlled measuring device is determined. For evaluating the image data, algorithms can be used that perform pattern recognition and evaluate the image data in the range visually perceptible to humans, as well as image data that arises outside the range visually perceptible to humans. In particular, the camera can be equipped with appropriate filters to limit the recorded wavelengths, especially for detecting the markings of the mobile measuring device. These can be detectable, for example, in the infrared wavelength range.

[0016] In addition to determining the position of the measuring device, the position of the measuring object can also be determined using the image data provided by the camera. For this purpose, the measuring object can also be provided with appropriate markings.

[0017] After determining the spatial position of the measuring device, i.e., its position and orientation, the measuring device is controlled to move to a spatial position and orientation within the measuring range that corresponds to a designated measuring position. As explained above, the measuring position can be moved to by logic in the control and evaluation device and control commands sent from there to the measuring device, or the measuring device receives position information from the control and evaluation device and moves to a measuring position independently.

[0018] When the measuring position is reached, at least one quality value of a wireless communication connection between the measuring device communication device and the at least one measuring object communication device is recorded. In this step, actual communication between the units can take place, but this is not necessary in every case. Rather, it is necessary that a quality value, e.g. a signal strength, is recorded that can be identifiably assigned to a connection between the measuring device communication device and a specific measuring object communication device. If the measuring object has multiple measuring object communication devices, the quality data is recorded in assignment to the respective measuring object communication devices.

[0019] The quality data can be assigned to an identifier of the respective measurement object communication device and stored initially in the measurement object communication device or in a memory of the measuring device itself, which is coupled to the measurement object communication device to receive this data. Alternatively, the measured values ​​can be transmitted directly or collectively to the control and evaluation device, with both wired and wireless transmission means being possible. In one of these devices, the recorded quality values ​​are stored in conjunction with the spatial position and, if applicable, the spatial orientation, as well as the associated measurement object communication device.

[0020] The above-mentioned steps of changing the position and / or orientation of the measuring device are repeated until the measuring area (or measuring field) has been traversed with the desired resolution. Afterward, spatially resolved and, if necessary, additionally orientation-resolved information is available on the quality of the wireless communication link at various positions around the measuring object.

[0021] When traveling through the various spatial positions, predetermined paths can be followed which are predetermined depending on the position of the measuring object. Alternatively, the trajectory can also be adjusted dynamically depending on the recorded quality values, e.g. if areas with strongly fluctuating quality values ​​of the wireless communication are to be traveled with higher resolution than areas in which the quality values ​​vary less. In a preferred embodiment of the method, the holder of the mobile measuring device is designed to be height adjustable. The height adjustment can be triggered remotely by the control and evaluation device in order to measure the quality data of the communication connection at different heights above the floor while the spatial position of the measuring device relative to the measuring object is the same.Alternatively, the measuring device itself can perform a measurement sequence at different room heights for each room position. Height adjustment can be achieved, for example, by mounting a vertical support structure equipped with a belt drive on a carriage. The holder is coupled to the belt so that it can be positioned at different heights together with the measuring device accommodated in the holder.

[0022] It is advantageous to position the camera above the measuring object.

[0023] Arranging the camera above the measuring object enables the recording of measuring areas around the measuring object, provided that the camera's detection angle is sufficient and / or the distance between the camera and the measuring object is large enough. The camera can be arranged centrally above the measuring object and, for example, aligned vertically or slightly diagonally to the ground in order to capture the measuring object from above. On the other hand, camera arrangements are also conceivable in which one or more cameras are mounted with an oblique viewing angle at a height that is greater than the height of the measuring object. When arranging and aligning the camera, it must be taken into account that the resolution of the images is directly related to the accuracy of the position determination of the measuring device.While a fixed camera position always provides a reliable reference for position determination, it is also possible in principle to change the camera position for different measurement runs, for example, to capture certain measuring areas with higher resolution. The camera position can be captured before the entire measurement process is carried out by manually entering the position data into the control and evaluation device, or by system-side optical calibration using markings in the measuring area or on the measuring object, or with the aid of positioning drives on a camera mount.

[0024] It is advantageous to align the camera so that it captures the entire measurement object within its detection range and simultaneously also the adjacent spatial areas along the entire circumference of the measurement object. In such a configuration, a spatially resolved measurement of the quality of communication links can be acquired with a single camera alignment along the entire circumference of the measurement object. For this purpose, the camera optics must be selected accordingly, in accordance with the camera's mounting height.

[0025] In a preferred embodiment of the measuring method, a vehicle is used as the measuring object.

[0026] Vehicles are typically equipped with multiple communication devices, e.g., LF coils in the vehicle handles and other transmitting and receiving devices. Modern vehicles also have UWB communication units mounted at convenient locations on the vehicle to locate the communication devices carried by a user, allowing the position of a user with a UWB-enabled communication device to be determined relative to the vehicle.

[0027] In order to be able to carry out measurements on these, possibly several, communication devices on the vehicle at any time, in a preferred embodiment of the invention the control evaluation device is coupled to a field bus of the vehicle, wherein the field bus can in particular be a CAN bus.

[0028] Via the fieldbus or CAN bus, the control and evaluation device can read out the quality data from the connection of individual transceiver devices on the measuring object (the vehicle) whenever the measuring device has reached a predetermined measuring position. In this case, the measured values ​​from the measuring object are recorded by the control and evaluation device directly on the measuring object. In addition, a measurement can also be taken in the measuring device's communication device. This arrangement has the advantage that, as a rule, all the quality data from each of the communication devices is available via a vehicle bus and can be read out according to a defined and specified protocol. In particular, the bus connection can also be used to record quality values ​​from measuring object communication devices to which the measuring device's communication device cannot establish a connection.This is particularly advantageous for mapping areas where no communication link can be established.

[0029] As already mentioned, it is advantageous to use UWB communication as the wireless communication method between the measuring device communication device and the measuring object communication device. UWB communication is characterized by broadband signal communication with a short range and transmission power. UWB-based communication methods allow (relatively) precise positioning and are particularly suitable for systems that require such precise positioning for access authorization checks. This is particularly the case for vehicles with wireless access systems. UWB communication is heavily dependent on shielding effects and is therefore sensitive to the arrangement of the UWB communication devices on the vehicle.With the method according to the invention it is possible to measure the effects of the vehicle body and other vehicle structures on the quality of a UWB connection around a motor vehicle.

[0030] It is particularly advantageous if the holder of the measuring device is designed to detachably accommodate a communication device of the measuring device.

[0031] If the quality of a communication connection is to be measured using several different devices, for example, several mobile phones of different geometries and manufacturers, as well as with different internal structures, it is particularly advantageous if the measuring device holder is designed for detachable mounting. In this way, for example, different measuring device communication devices can be coupled to the same measuring device for a uniform measurement protocol, and the same position protocol can be run to record the respective quality values ​​for different positions for the different measuring device communication devices.

[0032] In a further development of this embodiment, the holder for releasably receiving a measuring device communication device has a plurality of holder adapters for attaching a selected measuring device communication device. Such holder adapters can be adapted, for example, to different models of mobile phones or tablet PCs and enable a quick change of the measuring device communication device by coupling the respective holder adapter to a measuring device communication device on the one hand and to the measuring device itself on the other.

[0033] The use of a mobile phone as a measuring device-communication device is particularly advantageous.

[0034] While a transmission / reception system specifically designed for the measurement can in principle be arranged on the measuring device as a communication device, the use of a commercially available mobile phone enables particularly realistic measurements.

[0035] While the position detection of the measuring device can in principle be carried out via the camera and the control evaluation device using a measuring device image recording, it is also advantageous to equip the measuring device with several artificial markers.

[0036] The artificial markers enable particularly precise detection, while image recognition with natural markers regularly depends on optimized environmental and lighting conditions.

[0037] Accordingly, in a preferred embodiment of the invention, several light sources are used as artificial markers on the measuring device. Particularly preferably, the light sources are light sources in the infrared spectrum, in particular infrared LEDs. If such infrared LEDs are used as artificial markers, the camera can be equipped with an appropriate wavelength filter to filter out interfering environmental influences, for example, to largely filter out the UV spectrum and the spectrum visible to humans from the captured image data. The contrast of the corresponding image data can then be significantly improved for position determination.

[0038] It is also possible to apply appropriate artificial markers to the measuring object in order to also record its position via the camera. However, since the measuring object remains stationary during the measurement, a one-time recording at the beginning of a measuring cycle is usually relevant. After this one-time position recording, the artificial markers on the measuring object can be regularly removed so as not to disrupt the dynamic position recording of the measuring device relative to the measuring object during the measuring cycle.

[0039] The invention will now be explained in more detail with reference to an embodiment which is also shown in the attached figures.

[0040] Figure 1 shows schematically the arrangement of essential components for carrying out an embodiment of the method according to the invention;

[0041] Figure 2 shows schematically the components and communication connections when carrying out an embodiment of the method according to the invention;

[0042] Figure 3 shows a measuring device according to the first embodiment;

[0043] Figure 4 shows a flow diagram of the embodiment of the method according to the invention;

[0044] Figure 5 shows a schematic distribution of quality data at different measuring positions;

[0045] Figure 1 shows a measurement object in the form of a vehicle 1. The vehicle 1 is arranged centrally in a measuring area 2 (measurement field). The measuring area 2 is located in the detection range of a camera 3. The camera 3 is arranged centrally above the vehicle 1. A remote-controllable measuring device 4 is designed as a ground-mobile robot that can maneuver around the vehicle 1 in the measuring area 2 (as shown below).

[0046] The size of the measurement area, i.e., the horizontal and vertical field of view of the camera, must be taken into account when planning the measurement. The field of view of one of the cameras 3 must be selected so that no distortions are recorded at the edges to a degree that would negatively affect the resolution of the positioning in these areas.

[0047] Figure 2 shows a schematic plan view of the structure. The vehicle 1 is located centrally in the measuring area 2. In the measuring area 2, the measuring positions to be approached are symbolically represented by circles 2a. The measuring device 4 is designed as a robot that can be moved across the floor and has a height-adjustable measuring device communication device 6. The measuring device used in this exemplary embodiment consists of a robot from Nexus, the robot platform of which is equipped with four driven Mecanum wheels. A vertical rod arrangement is arranged on the robot platform, along which a holder can be moved via an electrically driven belt drive. A mobile phone is arranged in the holder as the measuring device communication device 6.This allows the measuring device 4 to move on the floor in the measuring area 2 and the height of the measuring device communication device 6 to be varied via the electrically driven belt drive, so that measurements with different height settings can be carried out at each of the measuring points 2a.

[0048] A control and evaluation device in the form of a computer 10 is arranged near the measuring area 2 and communicates with the measuring device 4 via a radio connection 4a. In this exemplary embodiment, the communication connection 4a is a Bluetooth connection. The computer 10 is coupled to the CAN bus of the vehicle 1 via a signal line 1a via interfaces. Furthermore, the computer 10 is coupled to the camera 3 via a connection 3a. Image data is transmitted from the camera 3 to the computer 10. UWB communication devices as measurement object communication devices 5a, 5b, 5c, 5d, 5e are arranged at several locations on the vehicle 1 (measurement object). These measuring object communication devices 5a, 5b, 5c, 5d, 5e are in turn coupled to the CAN bus of the vehicle, if necessary with the interposition of a central control system of the vehicle 1.As a control and evaluation device, computer 10 can record the quality data of a communication connection between each of the UWB communication devices at any time. If a UWB communication device is not in communication with another communication participant, this must also be recorded by computer 10.

[0049] The measuring device 4 moves through the measuring area 2 along a predetermined or dynamically generated trajectory in order to measure the quality values ​​of a communication between the measuring device communication device 6 and one or more of the UWB communication devices 5a, 5b, 5c, 5d, 5e at each of the measuring points 2a. It is in the nature of things that if no communication connection can be established between one or more of the UWB communication devices 5a, 5b, 5c, 5d, 5e and the measuring device communication device 6, no quality values ​​can be recorded by the measuring device communication device 6 and the measuring device 4 itself, apart from the information that no communication is possible.However, the quality values ​​recorded in parallel by the computer 10 at the same position, which are read out from the bus system of the vehicle via the connection la, enable a mapping of the entire area 2 for each of the UWB communication devices 5a, 5b, 5c, 5d, 5e.

[0050] This illustration already shows that, depending on the position of the measuring device 4 within the measuring area 2, the signal connections to the respective UWB communication devices 5a, 5b, 5c, 5d, 5e will, on the one hand, have a different signal path and, on the other hand, will be subject to different tuning by the vehicle body. This has a significant impact on the quality values, as shown below with reference to Figure 5.

[0051] The measuring device 4 used in this exemplary embodiment is shown in a perspective view in Figure 3. On the floor, the robot base 4b is shown with four driven Mecanum wheels. This robot base is equipped with drive means, an energy storage device and transmitting and receiving means for communication with the floor. The robot base receives position information or control information about the movement in the measuring area 2 from the control and evaluation device 10. A support structure 4d with a belt drive 4e is arranged on the robot base 4b. A carrier 4c is connected to the belt drive 4e in order to adjust the height of the carrier 4c relative to the floor using a motor. For this purpose, the belt drive 4e is coupled to a controllable electric motor.A mobile phone is clamped into the holder 4c as a measuring device / communication device 6, so that the mobile phone as a measuring device / communication device 6 is held so that it can be moved in a height-adjustable manner on the robot base 4b. The known control of a drive for the Mecanum wheels makes it possible to move the measuring device 4 as desired within the measuring area 2 and to align its orientation to the measuring object. Three infrared LEDs 4f are arranged at the upper end of the support structure 4d in the area of ​​the belt bearing. These infrared LEDs 4f are detected by the camera 3 and the corresponding image data is evaluated in the control and evaluation device 10. The sorting of the detected infrared LEDs is possible because the different distances between the LEDs allow orientation recognition and assignment.It can be seen that the LEDs are arranged in a triangular structure, although this is not an equilateral triangle, so that one of the LEDs can be identified at any time based on the distance measurement of the image data. By arranging the infrared LEDs as markers 4f at the upper end of the support structure 4d, shading of these markers by the measurement object 1 is largely avoided.

[0052] Figure 4 shows a flowchart for implementing the method according to the invention according to the first exemplary embodiment. The process is divided into three main parts 100, 110, 120 and is shown from the perspective of the control and evaluation device:

[0053] - 110 : Detection of the vehicle to be measured ;

[0054] - 120 : Planning the measurement

[0055] - 130 : Carrying out the measurement .

[0056] At the beginning, the control and evaluation device 10 establishes a connection to the camera 3 and sets the parameters that are necessary for robust vehicle and robot detection. Once these have been set, the search for vehicle markers that identify the position of the vehicle 1 in the measuring area 2 begins. For this purpose, the current image is always processed and then a search is carried out for the markers. The markers can be optical markings or lighting devices temporarily attached to the vehicle, e.g. infrared LEDs. Before a measurement run, it is only necessary to measure the vehicle once in the measuring area 2 in order to determine its exact position and orientation in the measuring area 2. This optical calibration of the measuring object in the measuring area can be omitted entirely if the measuring object is precisely positioned in the measuring area at the beginning of the measurement.However, calibration using optical markers allows the measurement object to be placed within certain tolerances in the measuring range and the actual position to be taken into account in the measurements by initially calibrating the measurement object.

[0057] If the search for markers of the measuring object is successful, you can wait until an operator has removed the markers for the vehicle so that further measurements are not influenced by additional markers.

[0058] Subsequently, the search for the artificial markings 4f of the measuring device 4 is carried out. If this search is successful, the first part 110 of the method is completed.

[0059] The control and evaluation unit 10 then sorts the artificial markings 4f of the measuring device and creates a measuring point matrix 2a with the measuring positions to be specified. This is followed by route planning, i.e., the order in which the measuring device four should approach the measuring points 2A.

[0060] The measurement is carried out in process section 130. For this purpose, the camera 3 supplies a live video image to the control and evaluation unit 10. For each received image or at predetermined periodic intervals, the controlling and evaluation unit 10 determines the position of the artificial markings 4f of the measuring device 4. If the artificial markings 4f are not found by the controlling and evaluation unit, a new search is carried out in the next image data. If the artificial markings 4f are found, the control and evaluation unit sorts the found artificial markings 4f and thus determines the position and orientation of the measuring device 4. Depending on the position of the measuring device 4, the control and evaluation unit 10 can also determine on which side of the vehicle 3 the measuring device 4 is located and align the measuring device towards the vehicle.This ensures that there are no structures of the measuring device 4 itself between the measuring device / communication device (in this embodiment, the mobile phone) and the measurement object 1. After determining the position of the measuring device 4, the control / evaluation device 10 checks whether the measuring device 4 has reached the intended measuring point 2a and, if so, issues the command to stop. The actual measurement of the UWB connection quality then takes place, with the control / evaluation device 10 reading out the data from the respective measurement object / communication devices 5a, ..., 5e via the CAN vehicle bus. Quality parameters for the communication connections can also be stored in the measuring device / communication device 6 at the same time and, if necessary, sent directly via the Bluetooth connection 4a.

[0061] Figure 5 schematically shows the result of a measured value recording in one measurement run for a uniform height adjustment of the measuring device communication device 6. In this illustration, the quality values ​​shown refer to the connection of the measuring device communication device 6 at the respective marked positions with the measurement object communication devices 5b. For reasons of clarity, the recorded measured values ​​were divided into four categories: -, 0, +, ++, where the minus sign indicates no communication, the 0 indicates poor connection quality, a + indicates good connection quality, and a double ++ indicates very good connection quality. A corresponding measured value distribution can also be used for any of the other measurement object communication devices 5a, ..., 5e, whereby corresponding values ​​are also recorded at each measuring point 2a for different height settings of the measuring device.

[0062] communication device can be created.

Claims

Patent claims 1. A method for spatially resolved acquisition of quality information on wireless communication links, wherein a measurement object (1) is arranged stationary at a first spatial position, wherein the measurement object (1) has at least one first measurement object communication device (5a, 5b, 5c, 5d, 5e) for wireless communication, characterized in that at least one camera (3) is spaced from the measurement object (1) is arranged in a stationary manner and is aligned with the measurement object (1) in such a way that the measurement object (1) and at least one spatial region adjacent to the measurement object are detected as a spatial measurement region (2), a mobile, remote-controlled and ground-mounted measuring device (4) is placed in the spatial measurement region (2), wherein the measuring device (4) is equipped with markings (4e) which can be detected by the camera (3), the measuring device (4) has a holder (4c) which is coupled to a measuring device communication device (6), wherein the measuring device communication device (6) is designed for wireless communication with the measurement object communication device (5a, 5b, 5c, 5d, 5e), a control and evaluation device (10) is connected both to the camera (3) and to the measurement object communication device (5a, 5b, 5c, 5d, 5e) and to the measuring device communication device (6) is coupled for data transmission,and the image data of the camera (3) are read out by the control evaluation device (10) in order to determine the location of the remote-controlled, measuring device (4), - by controlling the remote-controlled measuring device (4) a spatial position and spatial orientation in the measuring area (2) is approached by the measuring device, - a quality value of a wireless communication connection between the measuring device communication device (6) and the Measurement object communication device (5a, 5b, 5c, 5d, 5e) is detected; - the quality value is stored in association with the spatial position and spatial orientation of the measuring device communication device (6).

2. Method according to claim 1, wherein the holder (4c) is designed to be height-adjustable relative to the ground by remote control and a spatial measuring height of the height-adjustable holder is set by controlling the remote-controlled measuring device with the aid of the control-evaluation device.

3. Method according to one of the preceding claims, wherein the at least one camera (3) is arranged above the measurement object.

4. Method according to one of the preceding claims, wherein the camera (3) is aligned and configured to capture the entire measurement object (1) with adjacent spatial regions in the entire circumference of the measurement object.

5. Method according to one of the preceding claims, wherein a vehicle is used as the measuring object (1).

6. Method according to claim 5, wherein the control evaluation device is coupled to a field bus of the vehicle, in particular to a CAN bus.

7. Method according to one of the preceding claims, wherein UWB communication is used as the wireless communication method between the measuring device communication device and the measuring object communication device.

8. Method according to one of the preceding claims, wherein the holder of the measuring device is designed to releasably receive a measuring device communication device.

9. The method of claim 8, wherein the mount for releasably receiving a measuring device communication device is equipped with one of a plurality of mounting adapters for securing a selected measuring device communication device.

10. Method according to one of the preceding claims, wherein a mobile telephone is used as the measuring device communication device.

11. Method according to one of the preceding claims, wherein the measuring device is provided with a plurality of artificial markers.

12. Method according to claim 11, wherein the artificial markers are at least partially infrared illuminants, in particular infrared LEDs.

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