EP1428044A1 - Close-range radar sensor with phase-difference measurement - Google Patents

Close-range radar sensor with phase-difference measurement

Info

Publication number
EP1428044A1
EP1428044A1 EP20020774333 EP02774333A EP1428044A1 EP 1428044 A1 EP1428044 A1 EP 1428044A1 EP 20020774333 EP20020774333 EP 20020774333 EP 02774333 A EP02774333 A EP 02774333A EP 1428044 A1 EP1428044 A1 EP 1428044A1
Authority
EP
European Patent Office
Prior art keywords
object
radar sensor
surface portion
output signal
input signal
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
EP20020774333
Other languages
German (de)
French (fr)
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
Priority to DE10146586 priority Critical
Priority to DE10146586 priority
Application filed by Siemens AG filed Critical Siemens AG
Priority to PCT/DE2002/003384 priority patent/WO2003027709A1/en
Publication of EP1428044A1 publication Critical patent/EP1428044A1/en
Application status is Ceased legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S13/00Systems 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
    • G01S13/02Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06Systems determining position data of a target
    • G01S13/08Systems for measuring distance only
    • G01S13/32Systems for measuring distance only using transmission of continuous unmodulated waves, amplitude-, frequency- or phase-modulated waves
    • G01S13/36Systems for measuring distance only using transmission of continuous unmodulated waves, amplitude-, frequency- or phase-modulated waves with phase comparison between the received signal and the contemporaneously transmitted signal
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S13/00Systems 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
    • G01S13/88Radar or analogous systems specially adapted for specific applications

Abstract

The invention relates to a radar sensor (1), with at least one transmitter device (2), for emitting an electromagnetic output signal (3), at least one receiver device (4), for receiving an electromagnetic input signal (5), produced by the output signal on at least one surface section (8) of an object (7) and an analytical unit (6), for determining a relative phase position between the output signal and the input signal. The radar sensor is characterised in that the output signal and/or the input signal is a selected high frequency signal in the range of 10 GHz to 110 GHz inclusive. An arrangement (11) with at least one said radar sensor and at least one object with at least one surface section is disclosed, whereby an absolute separation between radar sensor and the surface section of the object is selected in the range 0.001 m to 01 m inclusive. Furthermore, a method is disclosed by means of which a relative separation (9) between the radar sensor and the surface section of the object is determined. The radar sensor is universally applicable in the close range with a high resolution of 10 µm to 5 mm and is suitable for monitoring material thickness and material flow and the determination of static and dynamic data for a rotating body, for example a wheel or a shaft.

Description

description

Short-range RADÄRSENSOR WITH PHASE DIFFERENCE MEASUREMENT

The invention relates to a radar sensor having at least one transmitting device for emitting an electromagnetic output signal, at least one receiving apparatus for receiving a signal generated by the output signal on at least one surface portion of an object electromagnetic input signal and an evaluation device for determining a relative phase between the output signal and the input signal. In addition to the radar sensor, an arrangement is provided with at least one radar sensor and at least one object with at least one surface portion. In addition, a method is provided for determining a relative distance between the radar sensor and a surface portion of an object.

A radar sensor of the kind referred to is known from EP 0718637 Bl. The transmitting device of the known radar sensor has a transmitting antenna and the receiving device, a receiving antenna. The output signal and the input signal of the radar sensor is in each case a low frequency signal. With the aid of a phase difference mode, a distance between the radar sensor and the surface portion can be determined via the determination of the relative phase position between the output signal and the reflected on the surface section of the object input signal. Using the low-frequency signal resolution of the distance in the centimeter range is possible. Thus, the distance can be determined to be an obstacle when parking a motor vehicle with the aid of the radar sensor, for example.

For use, the high frequency signal is amplitude modulated with a low frequency pulsed signal. This method is relatively complicated. Object of the present invention is to provide a simpler compared to the prior art radar sensor, by means of which a relative distance of the Radarsen- sors can be achieved at a surface portion of an object with a distance resolution in the micrometer range.

The object is achieved by a radar sensor having at least one transmitting device for emitting an electromagnetic output signal, at least one receiving apparatus for receiving a caused by the output signal on at least one surface portion of an object electromagnetic input signal and an evaluation device for determining a relative phase 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 • from the range including 10 GHz up to and including 110 GHz selected high-frequency signal and the evaluation device comprises means for measuring a complex reflection coefficient of the output signal and the input signal to determine the relative phase position having.

To achieve the object, an arrangement with at least one such a radar sensor and at least one object is specified with at least one surface portion, wherein an absolute distance between the radar sensor and the surface portion of the object is selected from the range including 0.001 m up to and including 0, 1 m. It is also conceivable an absolute distance of up to 1.0 m.

According to a further aspect of the invention a method is provided for determining a relative distance between the radar sensor and a surface portion of an object. The method comprises the steps of: a) transmission of the output signal of the transmission device in the direction of the surface portion of the object, b) generating. of the input signal from the output signal at the surface portion, c) sending of 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 and f) determining the relative distance between the radar sensor and the surface portion of the relative phase position.

The transmitting device and the receiving device each have an antenna for transmitting or receiving electromagnetic radiation of the specified Hochfrequenzbe- kingdom. The transmitting antenna and the receiving antenna can be separated (bistatic measurements). Transmitting antenna and receiving antenna can be integrated (monostatic measurements) in a single antenna.

The evaluation unit preferably comprises a measuring apparatus for measuring a complex reflection coefficient of the output signal and the input signal. It is 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. For this purpose, the evaluation device has, for example an I / Q demodulator, to which a signal to 0 Hz (stationary objects) can be represented in the complex plane.

In particular, a relative distance between the radar sensor and the surface portion of the object can be determined from the relative phase position.

Preferably, the high frequency signal from the range from and including 50 GHz up to and including 110 GHz is selected. The high frequency is, for example, 76.5 GHz or 94 GHz. is conceivable. but also a frequency from the range from 1 GHz to 10 GHz.

Based on the high-frequency signal, a resolution of the relative distance in the millimeter to the micrometer range is possible. A distance resolution is selected in particular from the range from and including 10 microns up to and including 5 mm.

In particular, the input signal is a section at the Oberflächenab- of the object reflected output of the transmitting device. Generating the input signal from the output signal comprises a reflection of the output signal at the surface portion of the object. The input signal is reflected on the surface section output signal (primary radar method). but is also possible that a primary output signal generates a secondary radar signal at the surface portion conceivable. The secondary radar signal is the received signal, which is sent in the direction of the reception device (secondary radar method).

In a particular embodiment, the surface portion is produced by a movement of the object. In this case, the relative distance between the radar sensor and the surface portion during the movement, or after the movement, that is at a standstill may be determined.

With the aid of the determined relative distance, an absolute distance between the radar sensor and the surface portion of the object can be determined. In particular, an amount of movement and / or a direction of movement and / or a speed of movement and / or acceleration of the movement is determined. With the help of the radar sensor both static and dynamic measurement data of the object are thus detected. Under amount of movement a degree of made, may have already been completed movement is to be understood. With the amount and the direction of move- ment .a position of the object and / or the surface portion of the object can be specified.

In a particular embodiment, a comparison between the determined relative distance between the radar sensor and the object and a standard distance between the radar sensor and the object is performed. The standard distance can be predetermined. In particular, the standard spacing is telt by at least one-time movement of the object ermit-. By design, the surface of an object, for example the surface of a periphery of a wheel, a specific surface geometry may have. This surface geometry is detected by the unique motion of the object with the aid of the radar sensor. There are relative spacings between the radar sensor and the surface section determined. These relative distances are stored and used as a standard spacing. A structural change to the object to be measured is not necessary. In an inductive measuring system for the contactless detection of dynamic measurement data, for example, at least one measured variable donors would have to be attached to the object. The measure of donors, for example, a gear.

In particular, it is concluded that a functional capability of the object based on the comparison of the detected relative distance and the default distance. For example, the relative distance between the radar sensor and the surface portion of the object is determined continuously during the movement of the object. Due to a deviation of the relative distance from the standard distance a change in a location of the object and / or the radar sensor can be closed to a change of the surface portion and / or. Is a predetermined tolerance of the deviation of the relative distance is exceeded, a warning signal is generated, for example, indicating that the object is no longer functional and has to be replaced. In a particular embodiment, the motion of the object at least from the group of rotational movement about a rotational axis of the object and / or flow moving along a flow direction of the object and / or torsional movement about a torsional axis of the object and / or translational movement selected along a direction of translation of the object.

In a particular embodiment the surface section comprises a detectable by the radar sensor mark. The mark is, for example, a current generated in the surface portion of the trench. At the trench may have a depth of a few μ, the distance of the radar sensor and the surface portion changes. Thus, the relative phase position between the output and input signal, which is detectable with the aid of the radar sensor changes. a defined phase position is obtained at the surface portion with the marking.

The object is preferably selected from the group running Materi- al and / or wheel and / or plate and / or plate and / or shaft selected. For example, the object is a brake disk of a vehicle or the wheel of a rail vehicle.

With the aid of the radar sensor is, for example, an antilock braking system in a motor vehicle, an instantaneous rotational speed of a wheel of the motor vehicle determined. This is possible to stop the wheel. In addition, a deceleration (acceleration) can be determined. Rotating speed and deceleration of a wheel can for a dyna i see chassis control are used. The optimal dosage of driving and braking force is possible. In addition, an absolute position of the wheel and its direction of rotation is accessible. This data can be used in a navigation system.

Example, the invention also allows the measurement of the twist occurring when operating a shaft of the shaft. By the used measuring principle it is possible to measure each type of waves, since no additional measurement variable sensor must be mounted on the shaft, but the existing eccentricity (imbalance) is exploited. Structural Veränderun- gen on 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. By the information of twist a momentary load state of the wave can be detected and a driving force source (for example, a motor) in terms of optimizing a

Transmission, or also with respect to a possible destruction of the shaft to be controlled. Here is an example pointed to a sharp acceleration process in a motor vehicle.

In this way, a mechanical system can be used better in his efficiency, which will benefit a higher efficiency. In addition, the life span of shafts is increased, which reduces the operating costs of a machine with the shaft. By a provision of the shaft driving force, it is also possible to dispense with some safety margin in terms of the stress wave in the design of the shaft. The manufacturing cost of the shaft can be reduced. In addition, a data protocol over the life of a wave information on aging (decreasing rigidity) can enter the shaft and provide important data for optimizing the shaft. In addition to the twist of a single shaft and the torsion and a game of an entire power transfer line with bearings, shafts, gears, etc. can be measured without contact.

In the case of inspection of a material flow or a material thickness can be closed for example to an interruption of the material flow with the aid of the change of the relative distance. In a translational motion of the object, a surface portion of the object or a texture of the surface portion can be checked. The object is for example a plate or a tool. A deviation of the relative distance from the standard spacing can be applied to a

indicates destruction of the surface portion. For example, is located in the surface portion of a crater or a crack. In this way, wear (abrasion) of a tool is detected early. With knowledge of a Abnutzungsgra- of the tool, a tool life can accurately detect and minimize. The tool is for example a milling head with cutting edges. The radar sensor is mounted near the milling head. The milling cutters rotate past the radar sensor, wherein each individual cutting Router generates a characteristic signal. With defective cutting edges irregularities determined distance occur. The machine can be stopped so before a workpiece to be machined is damaged and extended production stoppages due to machine stoppage occur.

In addition to determining the wear of the tool and contamination, such as a bond or gumming, the surface portion of the tool can be detected.

The determination of the phase position, the radar sensor can also be a change in an amplitude of the output signal to the input signal, for example in a reflection of the output signal at the surface portion can be determined. In addition, a measurement mode according to the Doppler principle is possible, for example for use of the radar sensor in the far range. Thus, the radar sensor is a multi- nelle measuring unit.

To sum up, with the invention the following advantages: • The radar sensor can be used at close range with a high distance resolution.

• The radar sensor is universally applicable.

• With the help of the radar sensor dynamic data as well as the position of an object can be detected without contact and very accurate. For this, a specific surface geometry of the object to be measured is used in particular.

• Over a long-term log of the relative distance between the radar sensor and the surface portion of the object can be closed to a change of the object (for example, wear, balance, bearing damage).

Reference to several embodiments and the accompanying drawings, the invention will be explained in more detail below. The figures are schematic and are not true to scale.

Figure 1 shows an arrangement with radar sensor and the brake disc.

Figure 2 shows an arrangement with radar sensor and wheel of a rail vehicle.

Figure 3 shows an arrangement for measuring a torsion of a shaft.

Figure 4 shows an arrangement with Radar sensor for Materialflussuberwachung.

Figure 5 shows a method for determining a relative distance between the radar sensor and an upper surface portion of an object. The radar sensor 1 has a transmitter device 2 having a transmitting antenna and a receiving device 4 with a receiving antenna (Figure 1). With the aid of the antennas, an electromagnetic high-frequency signal of 76.5 GHz is ausgesen- det or received. In addition to the antennas 1, the radar sensor to an evaluation device 6 for determining a relative phase between the output signal 3 and the input signal. 5 The evaluation device 6 comprises an I / Q demodulator. The radar sensor 1 and an object 7 are arranged in such a way to an arrangement 11 to one another, that the output signal 3 is directed to a surface portion 8 of the object. 7 There is a transmission of the output signal 3 of the transmitting apparatus 2 in the direction of the surface portion 8 of the object 7 instead (Figure 5, step 50). On the surface portion 8, the output signal 3 is reflected (step 51) and transmitted as an input signal 5 in the direction of the receiving device 4 (step 52). There, the input signal 5 is received (step 53). Furthermore, the relative phase position of the output signal of the input signal 3 and 5 by the evaluation device 6 determines (step

54). Due to the particular phase position of the relative distance is determined 9 between the radar sensor 1 and the surface portion 8 of the object. 7 the absolute distance can be deduced 10 from the relative distance. 9

Embodiment 1:

According to a first embodiment of an arrangement 11 is provided for measuring a brake disc 20 of a motor vehicle (Figure 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 so that the transmitting antenna and the receiving antenna are directed towards a surface 26 of a circumference of the brake disc 25th The surface 26 of the circumference of the brake disc 25 is the surface to be measured section 8. A propagation direction of the outgoing transmission signal from the transmitting antenna is directed radially to the rotation axis 13 of the brake disc 20th

Each brake disc 20 has by design a over a full circumference (the rotational angle 23 is 360 °) varying radius 22. When a full revolution thus the relative distance 9 and thus also the absolute distance 10 between the radar sensor 1 and the circumferential surface 26 varies, the radar sensor 1 is used to detect the varying radius of the brake disc 22 twentieth This is achieved by means of the detected relative distance 9 and thus also the absolute distance between the radar sensor 10 1 and the peripheral surface 26 of the brake disc 20th

With precise assignment of the relative distance 9 to the corresponding value of the rotation angle 23 may be 9 is closed on the corresponding rotation angle 23 for determining the relative distance. An ambiguity could characterized hen entste- that a plurality of angles of rotation 23 equal relative distances are associated with. 9 Since the relative distance 9 can be considered as a function of the rotation angle 23 which is repeated periodically with multiple rotational angle values ​​of 360 °, the ambiguity mentioned can be eliminated. If the rela- tive distance 9 continuously detected during a full revolution of the disc 20, it can be concluded 9 over a full cycle of the rotation angle 23 of 360 ° uniquely to the corresponding rotation angle 23 by knowledge of the periodic course of the relative distance. Thus, a current angular position of the brake disk 20 via the determination of the relative distance 9 is possible. A position control is independent of the speed of rotation of the brake disk 20 and to stop the brake disc 20 can be carried out.

Because of the periodically repeating radius curve at each rotation of the brake disc 20 and the determination of the angular velocity, ie the rotational speed of the disc 20 is possible in addition to determining the angle of rotation 23rd For this purpose, the time interval between two successive radii of periodic waveforms is measured. About the AEN this time interval alteration from one revolution to the next is also close to the acceleration or deceleration.

In Figure 1, an internally ventilated brake disc 20 is ones shown, provides. Besides the already mentioned periodical change of the relative distance of the radius of 9 and 22 is alternatively through the vents 27 and the connecting webs 28 generates another periodic signal with respect to a phase transition between output 3 and input signal. 5 The ventilation slots 27 and connecting webs 28 are markers that can detect the radar sensor. The company resulting from the marks periodicity can also be used to determine the metrics of the above-described principle.

Embodiment 2:

According to a second embodiment of an arrangement 11 for monitoring a wheel 18 of a railway vehicle is turned given (Figure 2).

For detecting a speed of the rail vehicle, the radar sensor 1 is mounted at a small distance to the object 7 in the form of a wheel 18 of a railway vehicle. On the surface of the perimeter 26 (surface portion 8) 18 has the wheel on a characteristic structure, which is detected by the radar sensor. 1 From the periodicity of repeating structures of the peripheral surface 26, that is, recurring relative spacing 9 between the radar sensor 1 and the peripheral surface 26, and the corresponding time intervals of a period can be according to the law V = s / t (speed is equal path (here, the circumferential ) divided close to the current speed of the rail vehicle by the required time).

The radar sensor 1 also serves as a condition check of the wheel 18 or the wheel tire. The radar sensor 1 scans the circumferential surface 26 of the wheel 18 from. Thus, wear, damage 29 or a crack can be detected. A wear is recognized that the determined relative distance 9, having a general drift over the entire circumference as compared to a standard distance of 30, which was added at a installation of a new wheel. Damage or a crack at the periphery is recognized, that the determined relative distance 9 has at the defect 29 significant jumps that would not occur in a perfect wheel 18th The sudden appearance of such a disorder (once or several times per revolution or period) is a clear indication of a faulty wheel 18 or a defective tires.

The radar sensor 1 is also used for detecting bearing damage of the wheel 18th During operation, a wheel 18 with a defective bearing 30 rolls on irregularities. These irregularities are detected by the radar sensor 1, since the detected relative distance 9 is not strictly periodic, but is overlaid by a disturbance that is attributable to the defective bearing 30th Unlike a crack occurs in the disorder determined distance 9 but not abruptly on, but grows slowly and takes just as slowly but irregularly at each revolutions hung again.

Embodiment 3:

According to a third embodiment of an arrangement 11 is provided for measuring a torsion of a shaft 21 (Figure 3). Given is. an object 7 in the form of a shaft 21, which is to be transferred to a load 33 32, a force of a motor. To measure the twist the torsion between the measuring points 34 and 35 found on the shaft. 1 An interval 38 of these measuring points is determined by the position of the radar sensor 36 and the radar sensor 37th

The twist 12 of the shaft 21 can be regarded as an axial rotation 12 of the cross-sectional area of ​​the shaft 21 in the measuring point 34 to the cross-sectional area in the measuring point 35. The relative position of these cross-sectional areas It is determined each other.

The position of the cross-sectional area of ​​the shaft 21 in the measuring point 34 or in the measuring point 35 is - described by the rotation angle 23 - in analogy to the embodiment 1 for a brake disc. As an indicator of the angle of rotation 23 of the cross-sectional area of ​​the shaft 21 in the respective measuring point, the manufacturing and system-induced eccentricity of the shaft 21 is utilized overall. This is achieved by considering the phase characteristic of the output signal. 3 Since the relative distance 9 of the radar sensor is changed to the moving surface portion of the shaft 21 when changing the angle of rotation 23, located suggests this in a change in the electrical length, ie, the phase position of the output signal 3 and the input 5 to each other down. On the periodicity of the eccentricity or irregularity of one rotation to the other can be applied to 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 are overall concluded.

In an alternative embodiment, not the random eccentricity or irregularity of the wave is utilized. It is processed 21 of the shaft mechanically to the measuring point 34 and at the measurement point 35vgezielt to obtain a defined phase of the signals 3 and 3 during one revolution of the rotation angle 23 of the output surface portion 3 upper reflective.

By using the radar sensor 36 in the measuring point 34 and the radar sensor 37 in the measuring point 35, the axial position of the cross-sectional areas in the measuring points is known. Thus, the rotation angle can be closed to the position of the two cross-sectional areas to one another by difference. Subject to load the shaft 21 at a twist, then the cross-sectional areas in the measuring point 34 and the measuring point 35 will shift to one another, which leads to a change in the rotational angle difference is detected. This rotational angle difference, which is a direct measure for the torsion, can be measured in the static condition of the shaft, but also at a rotating shaft.

Embodiment 4:

According to a fourth embodiment of an arrangement 11 is indicated by radar sensor 1 to the material flow and material thickness monitoring (Figure 4).

When using the radar sensor 1 for material thickness monitoring the radar sensor 1 in low absolute distance 10 to the flowing material 17 or a plate 19 is mounted. The flowing material 17 is moved from a Fließproduziermaschine in flow direction 15 °. The plate 19 is moved in the direction of translation sixteenth The alignment of the radar sensor is perpendicular to the direction in which a fluctuation thickness- 41 to be detected. The variation in thickness of 41 causes a change in the relative distance 9 between radar sensor 1 and the surface portion 8. By arranging a plurality of radar sensors 1 next to each other can be a greater width of the object 7 to monitor.

When using the radar sensor 1 for Materialflussuberwachung the radar sensor 1 at a small distance 10 is used for surface-chenabschnitt 8 of an object 7 is mounted in the form of a flowing material 17th At an interruption of the material flow 39, the radar sensor 1 is not reflected from the surface portion 8 of the material 17 more signal so that at the output of the radar sensor 1 merely rests noise. This can be seen as an interruption. 39

Claims

claims
1. Radar sensor (1, 36, 37) with at least one transmitting device (2) for emitting an electromagnetic output signal (3), at least one receiving device (4) for receiving a by the output signal (3) (on at least one surface portion 8, (26, 34, 36) of an object (7, 17, 18, 19, 20, 21) generated electromagnetic input signal (5) and an evaluation device (6) for determining a relative phase between the output signal (3) and the input signal 5), characterized in that - the output signal (3) and / or the input signal (5) is a selected from the range from and including 10 GHz to 110 GHz, including high-frequency signal.
2. Radar sensor according to claim 1, wherein the radio frequency signal is selected from the range from and including 50 GHz up to and including 110 GHz.
3. Radar sensor according to claim 1, wherein the evaluation device (6) a measuring device (40) for trade fairs a complex reflection coefficient of the output signal (3) and the input signal (5), wherein the relative phase position can be determined from the complex reflection factor ,
4. Radar sensor according to claim 3, wherein the relative of
Phase position of a relative distance (9) between the radar sensor (1, 36, 37) and the surface portion (8, 26, 34, 35) of the object (7, 17, 18, 19, 20, 21) can be determined.
Radar sensor according to claim 4, in which a distance resolution of the relative distance (9) from the range from and including 10 microns up to and including 5 mm is selected.
6. Radar sensor according to one of claims 1 to 5, wherein the input signal (5) reflected a at the surface portion (8, 26, 34, 35) of the object (7, 17, 18, 19, 20, 21) output signal (3 ) of the transmitter device (2).
7. An arrangement with at least one radar sensor according to one of claims 1 to 6 and at least one object with at least one surface portion, wherein an absolute distance (10) is selected between the radar sensor and the surface portion of the object from the loading ranging from and including 0.001 m to including 0.1 m.
8. An arrangement according to claim 7, wherein a plurality of radar sensors are arranged side by side.
9. An arrangement according to claim 7 or 8, wherein the surface portion by a movement (12) of the object can be generated.
10. An arrangement according to claim 9, wherein the movement of the object at least from the group of rotational movement about a rotational axis (13) of the object and / or flow moving along a flow direction (15) of the object and / or a torsional movement about a torsional axis (14) of the object and / or a translational movement along a translational direction (16) of the object is selected.
11 has arrangement according to one of claims 7 to 10, wherein the surface portion of a erfass- by the radar sensor bare mark (27, 28).
12. An arrangement according to one of claims 7 to 11, wherein said object at least from the group of flowing material (17) and / or wheel (18) and / or plate (19) and / or disc
(20) and / or shaft (21) is selected.
13. A method for determining a relative distance between a radar sensor and a surface portion of an object of an arrangement according to one of claims 7 to 12 comprising the steps of: a) transmission of the output signal of the transmission device in the direction of the surface portion of the object, b) generating the input signal from the output signal at the surface portion, c) sending of 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 and f) determining the relative distance between the radar sensor and the surface portion of the relative phase position.
14. The method of claim 13, wherein for determining the relative phase position of the output signal and the input signal measuring a complex reflection coefficient is performed.
15. The method of claim 13 or 14, wherein determining the relative distance is carried out with a distance resolution in the range of 10 microns to 5 mm.
16. The method according to any one of claims 13 to 15, wherein generating the input signal from the output signal comprises a reflection of the output signal at the surface portion of the object.
17. The method according to any one of claims 13 to wherein the surface portion of the object is generated by a movement of the object 16.
18. The method of claim 17, wherein the relative distance between the radar sensor and the surface portion of the object depending on the movement.
19. The method of claim 17 or 18, an amount of movement and / or a direction of movement and / or a speed of movement and / or acceleration of the movement is determined in with the aid of the detected relative distance.
20. The method according to any one of claims 13 to 19, in which a comparison between the determined relative distance between the radar sensor and the surface portion of the object and a standard distance between the radar sensor and the surface portion of the object is performed.
21. The method of claim 20, wherein the standard distance by an at least one-time movement of the object ER- averages.
22. The method of claim 20 or 21, is concluded in the overall from the comparison of the detected relative distance and the default distance to a functional capability of the object.
EP20020774333 2001-09-21 2002-09-11 Close-range radar sensor with phase-difference measurement Ceased EP1428044A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE10146586 2001-09-21
DE10146586 2001-09-21
PCT/DE2002/003384 WO2003027709A1 (en) 2001-09-21 2002-09-11 Close-range radar sensor with phase-difference measurement

Publications (1)

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EP1428044A1 true EP1428044A1 (en) 2004-06-16

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WO (1) WO2003027709A1 (en)

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