SENSOR ARRANGEMENT AND METHOD FOR OPERATING A SENSOR ARRANGEMENT

Description

[0001] The invention relates to a sensor arrangement and a method for operating a sensor arrangement.

[0002] Such a sensor arrangement is known from DE 102 11 779 B4. The device described therein comprises an optical sensor with a transmitter emitting light beams, a receiver receiving light beams, means for guiding the transmitted light beams within a scanning range, and an evaluation unit for evaluating the received signals at the receiver's output. The optical sensor detects position markers that form a position measurement system. By detecting position markers of the position measurement system at two different times, the speed of the optical sensor relative to the position measurement system is also determined.

[0003] The optical sensor is particularly advantageously mounted on a vehicle, with the position measurement system being stationary on the roadway along which the vehicle travels. In principle, a position measurement system can also be moved relative to a stationary optical sensor. Through the continuous detection of the position markers of the position measurement system, the optical sensor continuously determines the current speed and position values ​​and transmits them to the vehicle's control system. In the control system, these measured values ​​can be used directly for vehicle control without further evaluation and, in particular, without any synchronization effort.

[0004] The position measurement system is typically designed in the form of a tape that is glued onto a support surface, in particular a roadway boundary.

[0005] External interference, particularly from objects striking this belt, can damage the position markers of the positioning system. These damaged markers can no longer be read by the optical sensor, making position determination impossible in that area.

[0006] In principle, it is possible to replace defective position markers with exactly the same ones. However, this requires ordering, procuring, and installing new sections of the position marker system. A disadvantage is the undesirably long delivery times for new sections of the position marker system. Furthermore, only a portion of the position markers are to be replaced, which necessitates custom assembly by the supplier. Keeping a complete position marker system in stock is complex and inefficient, as only small parts are needed for repairs to the existing system.

[0007] DE 10 2008 032 786 A1 relates to a device and a method for determining the position of a vehicle. The vehicle is movable along a track in one direction of movement and has an optical position marker reader for scanning position markers line by line. The position markers are arranged along the track in a defined orientation. For this purpose, the position marker reader has means for scanning individual position markers multiple times in a plurality of spaced-apart lines.

[0008] EP 3 399 336 A1 relates to a device comprising a position measurement system formed by an arrangement of markers and an optical sensor for detecting the markers of the position measurement system. The optical sensor and the position measurement system are arranged to be movable relative to each other. Position information and a checksum are encoded in each marker. The position information and the checksum are evaluated in an evaluation unit of the optical sensor. Error checking is performed using the checksum.

[0009] EP 3 270 114 A1 relates to a sensor arrangement with a first position sensor and an associated first cooperative target, which define a detection range. Position measurements taken with the first position sensor against the first cooperative target obtain initial position values. Furthermore, a second position sensor and an associated second cooperative target are provided, which also define the detection range. Position measurements taken with the second position sensor against the second cooperative target obtain second position values. A control unit, which calculates the first and second position values ​​from the two position sensors into a single calculation value, monitors the function of the position sensors.

[0010] The invention is based on the objective of providing a simple repair option for a position measurement system of a sensor arrangement of the type mentioned above.

[0011] To solve this problem, the features of the independent claims are provided. Advantageous embodiments and expedient further developments of the invention are described in the dependent claims. The sensor arrangement according to the invention comprises a band-shaped position measurement system which has an arrangement of position markers in which the positions of the position markers within the position measurement system are encoded as position values. With an optical sensor movable relative to the position measurement system, its position relative to the position measurement system can be determined by reading position markers. A defective sequence of position markers of the position measurement system is covered with a correction band, wherein the correction band is part of the sensor arrangement and has a sequence of correction markers that differ from the position markers.The position values ​​contained in the position markers are stored in a position measurement table in the optical sensor. If a correction tape covers defective position markers, the codes of the correction tape's correction markers replace the value range of the defective position markers in the position measurement table. Alternatively, the correction markers form a value range from which the optical sensor determines the position values ​​of the defective position markers.

[0012] The correction band provided according to the invention enables a simple and quick repair of a partially defective positioning system. After the repair, i.e., when the correction band covers the defective area of ​​the positioning system, the optical sensor can be positioned across the entire extent of the positioning system, so that the functionality of the positioning system and thus of the entire sensor assembly is fully preserved.

[0013] A key aspect of the invention is that the correction marks of the correction tape are different from the position marks of the position measurement system. The correction marks therefore do not contain the position values ​​of the position marks, but rather codes that simply need to be uniquely distinguishable from one another.

[0014] This allows the correction tape according to the invention to be used at any point in the position measurement system. This is a significant advantage over repairs using a segment of a position measurement system that must correspond exactly to the defective area of ​​the system. The flexibility of repairing the production measurement system is thus considerably increased by using the correction tape according to the invention.

[0015] This advantage is achieved according to the invention by the correction marks of the correction tape applied to the position measurement system replacing the value range of the covered, defective position measurement system. Thus, the position measurement system repaired with the correction tape is equivalent to the original production measurement system; that is, the optical sensor can also determine its position relative to the production measurement system exactly by reading the correction mark of the correction tape.

[0016] Crucially, the sequence of position markers of the position measurement system is stored as a position measurement table in the optical sensor. If a local defect in the position measurement system exists, which is covered by the correction tape, the correction markers replace the defective position markers. This is recorded in the optical sensor's position measurement table. The sequence of correction markers begins after the last intact position marker and ends at the first intact position marker. The unique codes then form interpolations between the two intact position markers that define the boundaries of the defect in the position measurement system, so that when the optical sensor reads this correction marker, its position relative to the position measurement system is determined using the corrected position measurement table.

[0017] Advantageously, the encodings of the correction mark are translated into a correction value sequence in the optical sensor, which replaces the value range of the covered position marks.

[0018] In particular, the coding of the correction mark of the correction tape can form a sequence of numbers and / or letters.

[0019] These numerical and letter values ​​can be translated into a linear sequence of correction values ​​that interpolate between the position values ​​of the position markers that define the correction band.

[0020] Advantageously, the optical sensor has a storage unit in which the position measurement table and the correction mark codes are stored non-volatilely.

[0021] In particular, the storage unit is assigned to an evaluation unit of the optical sensor.

[0022] Due to the non-volatile storage of the position measurement table, which is supplemented by encodings of the correction mark of the correction tape in the event of a defective position measurement system, the values ​​of the position measurement table are retained even in the event of a power failure, so that after the end of the power failure, positioning of the optical sensor relative to the position measurement system can be continued immediately and without further setup work.

[0023] Advantageously, the correction marks are detected using the optical sensor and the codes of the correction marks are entered into the position measurement table.

[0024] The correction of the position measurement table by replacing the defective position markers with the correction marker codes is thus performed automatically within the optical sensor itself. The optical sensor automatically detects the first and last intact position markers on either side of the defective area of ​​the position measurement system and the correction markers in between. A sequence of correction values ​​is then generated from the correction marker codes. This sequence lies between the position values ​​of the position markers adjacent to the defective area of ​​the position measurement system, thereby completely replacing the value range of the defective part of the position measurement system with the correction marker code.

[0025] According to a second embodiment of the invention, the correction marks attached to the position measurement system, which cover defective position marks, form a range of values ​​from which the position values ​​of the defective position marks are determined in the optical sensor. In this case, the original sequence of position marks is thus reconstructed from the applied correction marks in the optical sensor.

[0026] The determination of position values ​​of defective position markers covered with correction markers can be done using formulas.

[0027] The correction marks contain correction values ​​that differ from the position values. By knowing the assignment of correction marks to the covered position marks, as well as the known correction values ​​of the correction marks and the position values ​​of the position marks, a formula can be used to convert the correction value of a correction mark into the position value of the position mark it covers, thereby reconstructing the original sequence of position values ​​in the position measurement system.

[0028] Alternatively, the determination of position values ​​of defective position markers covered with correction markers can be done by searching for the correction marker codes in a correction table.

[0029] Linear search algorithms can be used. In particular, speed-optimized search methods such as binary search, indexing, or hashing can be employed.

[0030] The distinguishability of position markers and correction markers is advantageously given by the fact that the value range of the correction markers is not included in the value range of the position markers, and / or that the correction markers differ from the position markers with respect to an additional feature that can be detected with the optical sensor.

[0031] The position values ​​of position markers or the correction values ​​of correction markers can, for example, be formed by sequences of numbers, whereby the value ranges can be formed by predefined ranges of numerical values.

[0032] Alternatively or additionally, correction marks can differ from position marks in that they have additional features in the form of color characteristics, identifiers or the like.

[0033] Furthermore, the correction markers can form a sequence of values ​​that differs from the sequence of positions contained in the position markers, whereby the sequences of the correction markers and the position markers are distinguishable by means of the optical sensor.

[0034] Finally, at least one correction mark can contain a tax code.

[0035] These control codes can be used to mark the scope and / or end of a sequence of correction marks. The optical sensor can then more easily detect and locate the sequence of correction marks using these control codes.

[0036] According to an advantageous embodiment, correction marks attached to the position measurement system at a repair point can be configured in the optical sensor.

[0037] The repair point formed by correction marks on the position measurement system is thus configured in the optical sensor in such a way that the repair point does not have to be automatically detected and recognized by the optical sensor.

[0038] According to a first advantageous embodiment, the configuration is carried out by means of an input / output unit.

[0039] Thus, a user can configure the repair location and assign it to the optical sensor by entering data at the input / output unit. Suitable input / output units include interfaces, keyboards, or similar input devices on computer units. The configured settings are advantageously displayed to the user, ideally on the input / output unit's display.

[0040] According to a second advantageous embodiment, correction marks attached to the position measurement system at a repair point are determined in a learning process using the optical sensor.

[0041] During the learning process, the optical sensor scans the position measurement system with the repair location and stores the information captured from the position markers and correction marks. The position markers and correction marks are distinguished from one another based on their different characteristics. In general, any repair locations with correction marks that are found can also be logged in the optical sensor.

[0042] In particular, the learning process can also be carried out during operation of the optical sensor.

[0043] According to an advantageous embodiment, the optical sensor generates a warning message when it detects correction marks attached at a repair site.

[0044] Repairing the position measurement system by applying correction marks to defective position marks ensures error-free operation of the sensor arrangement; however, the correction marks generally represent an interim solution until newly delivered position marks replace the old, defective position marks and the correction marks can therefore be removed.

[0045] The warning message signals to the user that correction markers are present on the position measurement system and that there is therefore a need to order these position markers in order to replace defective position markers.

[0046] Advantageously, the warning message is generated with a pre-set delay time after the repair point has been installed.

[0047] Once defective position markers in the positioning system have been replaced with correction markers, it is not necessary to immediately procure new position markers. Therefore, it is sufficient to generate the warning message with a time delay.

[0048] Furthermore, the warning message advantageously includes the positions of the correction marks on the positioning system and / or the time of application of the repair point.

[0049] The warning message therefore contains all the information essential for the user about the repair point on the position measurement system.

[0050] According to an advantageous embodiment, the position markers and / or correction markers are optical codes in the form of barcodes, 2D codes or 3D codes.

[0051] Examples of 2D codes include 2D matrix codes such as composite codes, QR codes, stacked codes, Maxi codes, or Aztec codes.

[0052] The position markers and / or correction markers can be in the form of embossed or differently colored codes.

[0053] These codes can not only be printed on a surface, but can also be applied using lasers.

[0054] According to a further development of the invention, the position markers and / or correction markers have non-visible code structures.

[0055] These codes exhibit, for example, specific conductivity properties, magnetic or dielectric properties, or structures detectable by ultrasonic scanning. Instead of optical sensors, specific other sensors are used to scan such codes.

[0056] According to a further advantageous embodiment of the invention, the position markers and / or correction markers each consist of at least two codes which are scanned by means of a multi-channel scanning system.

[0057] This creates a redundant scanning system that meets increased security requirements.

[0058] According to a particularly advantageous embodiment of the invention, the optical sensor is arranged on a vehicle.

[0059] Accordingly, the position measurement system is attached to a roadway boundary.

[0060] By detecting the position markers of the positioning system using the optical sensor, the vehicle can be positioned in target positions, for example, to carry out loading and unloading operations in storage systems. For example, the vehicle could be a storage and retrieval machine that needs to be positioned at the shelves of a storage system.

[0061] Particularly in such applications, it can be advantageous to have an area identifier encoded in at least one correction mark of the correction tape.

[0062] These area identifiers provide additional information that can be used to guide the vehicle.

[0063] For example, area identifiers can be used to mark the beginning or end of lanes in which the vehicle is driving. Depending on the detection of these area identifiers, the vehicle's speed can be controlled.

[0064] The optical sensor of the sensor arrangement according to the invention can be a scanning sensor or a camera sensor.

[0065] The positioning system is particularly advantageous when designed as a strip that is glued onto a support surface.

[0066] Accordingly, the correction tape can also be glued onto the positioning system.

[0067] This allows for easy assembly of the positioning system and also easy application of the correction tape to the positioning system.

[0068] The invention will be explained below with reference to the drawings. Figure 1: Schematic representation of an embodiment of the sensor arrangement according to the invention, comprising an optical sensor and a position measurement system. Figure 2: Variant of the optical sensor for the sensor arrangement according to the invention. Figure 1 Figure 3: Representation of a section of the position measurement system according to Figure 1 with an associated correction tape. Figure 4: Implementation of a position measurement system with a repair point. Figure 5: Further embodiment of a position measurement system with a repair point. Figure 6: Further embodiment of a position measurement system with a repair point. Figure 7: Further embodiment of a position measurement system with a repair point.

[0069] Figure 1Figure 1 schematically shows an embodiment of the sensor arrangement 100 according to the invention, consisting of an optical sensor 1 and a position measurement system 2. The optical sensor 1 and / or the position measurement system 2 are movably arranged so that they can be moved relative to each other in the direction of movement indicated by arrow B. With the Figure 1 The sensor arrangement 100 shown allows objects that can be moved relative to each other to be positioned. In this case, a vehicle (not shown) is to be positioned relative to a stationary object in the form of a storage rack 3. The optical sensor 1 is mounted on the vehicle, while the position measurement system 2 is mounted on the storage rack 3. The vehicle can be configured as a storage and retrieval machine.

[0070] To determine the vehicle position relative to the stationary object, the position measurement system 2 is continuously scanned with the optical sensor 1.

[0071] The optical sensor 1 according to Figure 1 is integrated in a housing 4 and has a lighting unit 5 and an area camera as receiver 6, which are connected to a common evaluation unit 7.

[0072] The area scan camera is designed as a CCD camera, CMOS camera, or the like, and features a planar matrix arrangement of pixels forming receiving elements. The optical sensor 1 is mounted on the vehicle such that the area scan camera is at the same height as the position measurement system 2, so that a segment of the position measurement system 2 lies within the field of view 8 of the area scan camera.

[0073] The lighting unit 5, which is stationary in the housing 4, emits light beams 9, by means of which homogeneous illumination of the segment of the position measurement system 2 located in the field of view 8 of the area camera is achieved. In principle, the lighting unit 5 can also be arranged outside the housing 4.

[0074] The lighting unit 5 can emit light rays 9 in the visible or invisible range, especially the infrared range.

[0075] The position measurement system 2 consists of a linear arrangement of equidistant position markers 10 in a row, wherein the position markers 10 are designed as barcodes in this case. In general, 2D or 3D codes can also be used.

[0076] The production marks 10 contain position values ​​as position information, encoded as absolute positions within the position measurement system 2. By capturing the encoding of the production marks 10 and their positions within the images captured by the area scan camera, the current position of the optical sensor 1, and thus of the vehicle, relative to the position measurement system 2 can be determined. Furthermore, the speed of the optical sensor 1 relative to the position measurement system 2 is determined through a time-resolved evaluation of the position information. The determined position and speed values ​​are made available to the vehicle control system, enabling the vehicle to be controlled.

[0077] Figure 2Figure 1 shows a variant of the optical sensor 1 in the form of a scanning sensor. In this case, transmitting light beams 12 are emitted from a transmitter 11 and guided by a deflection unit 13 in the form of a rotating, motor-driven polygonal mirror wheel, thus being periodically guided within a scanning range A. The receiving light beams 15, guided coaxially to the transmitting light beams 12 by means of a beam splitter 14, are reflected from the position marker 10 to be detected and directed via the polygonal mirror wheel to a receiver 6. The transmitter 11 can be a light-emitting diode (LED), and the receiver 6 a photodiode. Again, the position of the position markers 10 within the scanning range is determined for precise position detection.

[0078] Figure 3 shows a section of the position measurement system 2 of the sensor arrangement 100 according to Figure 1The position measurement system 2 is preferably designed as a tape that can be glued onto a support surface, in particular a roadway boundary.

[0079] The absolute positions of the position markers 10, which are designed as barcodes, are encoded in the position measurement system 2, which can also be provided as plain text information under the respective area specifications (in Figure 3 (not shown).

[0080] Due to mechanical impacts or the like, the position markers 10 in the area marked I of the position measurement system 2 are defective, so that they can no longer be read by the optical sensor 1 (which in Figure 3 (symbolically represented by crossing out position markers 10).

[0081] In order to fully maintain the function of sensor assembly 100 even in such a fault case, as described in Figure 3As shown, a correction tape 16 is provided which can be glued onto the defective area of ​​the position measurement system 2, as indicated by the arrow in Figure 3 schematically represented.

[0082] The correction tape 16 has a linear arrangement of correction marks 17 in the form of barcodes. The correction tape 16 has the same width as the production measurement system. The sizes and spacing of the correction marks 17 correspond to the sizes and spacing of the position mark 10 of the position measurement system 2.

[0083] Unlike position markers 10, correction markers 17 do not encode absolute position values. Instead, correction markers 17 contain codes in the form of letter and / or number sequences, which may be displayed as plain text below the respective correction markers 17. It is essential that the codes of the correction markers 17 are uniquely distinguishable from one another.

[0084] The correction tape 16 is applied to the defective area of ​​the position measurement system 2. The correction tape 16 can be cut to different lengths. This allows the correction tape 16 to be applied to defective areas at any point on the position measurement system 2, covering the size of the defective area.

[0085] In a storage unit assigned to the evaluation unit 7 of the optical sensor 1, a position measurement table of the position measurement system 2 with all position values ​​of the position markers 10 of the position measurement system 2 is stored.

[0086] Will be, as in Figure 3 As shown, the defective area of ​​the position measurement system 2 is covered with the correction tape 16, and the correction marks 17 of the correction tape 16 are detected by the optical sensor 1. The optical sensor 1 detects the area of ​​the correction tape 16 and the adjacent position marks 10.

[0087] The optical sensor 1 then translates the encodings of the correction marks 17 into a correction value sequence that replaces the position values ​​of the sequence of defective position marks 10. Starting from the position value of the last error-free position mark 10 before the correction band 16 and extending to the position value of the first error-free position mark 10 after the correction band 16, the correction value sequence forms a sequence that replaces the value range of the defective position mark 10.

[0088] The repaired position measurement system 2 thus allows for precise positioning of the optical sensor 1 and therefore of the vehicle relative to the position measurement system 2 over its entire length, especially in the area of ​​the correction band 16.

[0089] The position measurement system 2, corrected with the correction value sequence, is stored non-volatilely in the storage unit and is therefore immediately available for positioning the vehicle after a power failure.

[0090] Instead of the aforementioned automatic correction of the position dimension table after affixing the correction tape 16 to the defective part of the position dimension system 2, the correction can also be carried out by a user who enters correction values ​​for the position dimension table via an input unit.

[0091] Figure 4 Figure 1 shows a further embodiment of a position measurement system 2 with a sequence of position markers 10 analogous to the embodiment according to the Figure 1 and 3 .

[0092] Position markers 10 are in Figure 4 whose position values ​​10, 20, ... 80 are specified, which, for example in cm, indicate the positions of the position markers 10 within the position measurement system 2.

[0093] How Figure 4The position measurement system 2 is damaged in the area of ​​position markers 10 with position values ​​40 and 50, so that a correction tape 16 with correction markers 17 has been applied there. The correction markers 17 contain position values ​​100 and 110 as correction values, the value range of which lies outside the value range of the position values ​​of the position markers 10, so that the correction markers 17 can be clearly distinguished from the position markers 10 by means of the optical sensor 1.

[0094] The repair points are advantageously configured in optical sensor 1.

[0095] According to a first embodiment, the configuration is carried out using an input / output unit.

[0096] According to a second embodiment, correction marks 17 attached to the position measurement system 2 at a repair point are determined in a learning process using the optical sensor 1.

[0097] The configuration stores the position measurement system 2 with the correction marks 17 of the repair point in the position measurement table.

[0098] According to the invention, the correction values ​​of the correction marks 17 in the position measurement table are replaced by the position values ​​of the defective position marks 10 covered by the correction marks 17, so that the position values ​​of the original position measurement system 2 can be reconstructed.

[0099] According to a first embodiment, this can be accomplished by a search algorithm that searches for the control marks in the position measurement table in a correction table and then replaces the control values ​​with the position values ​​of the defective position marks 10.

[0100] Alternatively, the position values ​​can also be calculated from the control values ​​using a formula. For example, for the control mark with a control value of 100, the formula 100 - 60 = 40 is applied, resulting in a position value of 40. For the second control mark with a control value of 110, the formula 110 - 60 = 50 is applied, resulting in a position value of 50.

[0101] The Figures 5 to 7 show further embodiments of the position measurement system 2 according to Figure 4 with different control marks for carrying out repairs.

[0102] The Figures 5 and 6 show further embodiments of a position measurement system 2 with a repair point, each comprising two control marks.

[0103] In the embodiments of the Figures 5 and 6 The position values ​​10, 20, 30 ... 80 of the position markers 10 again form a regular sequence, increasing in increments of ten from left to right with respect to the geometry of the Figures 5 and 6 grow larger.

[0104] In the embodiment according to Figure 5 Although the control values ​​31, 32 of the control marks also form an ascending sequence, they increase in increments of one from left to right.

[0105] In the embodiment according to Figure 6 Control marks are provided whose control values ​​19, 18 form a decreasing sequence from left to right.

[0106] In the embodiments of the Figures 5 and 6 Thus, the sequences of the control values ​​are different from the sequences of the position values, which allows the control markers to be distinguished from the position markers 10.

[0107] In the embodiment according to Figure 7 A repair point of the position measurement system 2 is present, with three control marks. The first and last control marks are control marks (marked ST). The middle control mark contains the numerical value 120 as its control value.

[0108] The control codes can be used to detect the beginning and end of the repair points with optical sensor 1.

[0109] The reconstruction of the original position measurement system 2 by replacing the control values ​​of the control marks with position values ​​of the covered, defective position marks 10 is carried out analogously to the embodiment according to Figure 4 .

[0110] According to an advantageous embodiment, the optical sensor 1 generates a warning message when correction marks 17 attached to a repair site are detected.

[0111] The warning message can be generated with a preset delay time after the repair point has been installed.

[0112] Advantageously, the warning message contains the positions of the correction marks 17 on the position measurement system 2 and / or the time of application of the repair point. Reference symbol list

[0113] (1) Optical sensor (2) Position measurement system (3) Rack storage (4) Housing (5) Lighting unit (6) Receiver (7) Evaluation unit (8) Field of view (9) Light beams (10) Position marker (11) Transmitter (12) Transmitting light beams (13) Deflection unit (14) Beam splitter (15) Receiving light beams (16) Correction tape (17) Correction marker (100) Sensor arrangement

Claims

1. Sensor arrangement (100) with a tape-shaped position measuring system (2) which has an arrangement of position marks (10), in which the positions of the position marks (10) within the position measuring system (2) are encoded as position values, and with an optical sensor (1) that is movable relative to the position measuring system (2), whereby the position of the optical sensor (1) relative to the position measuring system (2) can be determined by reading position marks (10) using the optical sensor (1), characterised in that the sensor arrangement (100) has a correction tape (16) which covers a defective sequence of position marks (10) of the position measuring system (2) is covered by the correction tape (16), wherein the correction tape (16) has a sequence of correction marks (17), wherein the correction marks (17) differ from the position marks (10), that the position values contained in the position marks (10) are stored in a position measurement table in the optical sensor (1), and that, in the case of a correction tape (16) covering defective position marks (10), the codes of the correction marks (17) of the correction tape (16) replace the value range of the position values of the defective position mark (10) in the position measurement table, or that the correction marks (17) form a value range from which the position values of the defective position marks (10) are determined in the optical sensor (1).

2. Sensor arrangement (100) according to claim 1, characterised in that the codes of the correction marks (17) of the correction tape (16) form a sequence of numbers and / or letters.

3. Sensor arrangement (100) according to one of claims 1 or 2, characterised in that the optical sensor (1) has a memory unit in which the position scale table and the codes of the correction marks (17) are stored non-volatily.

4. Sensor arrangement (100) according to claim 3, characterised in that the memory unit is assigned to an evaluation unit (7) of the optical sensor (1).

5. Sensor arrangement (100) according to one of claims 1 to 4, characterised in that a range identifier is encoded in at least one correction mark (17) of the correction band (16).

6. Sensor arrangement (100) according to one of claims 1 to 5, characterised in that the correction marks (17) are detected by means of the optical sensor (1) and the codes of the correction marks (17) are entered into the position measurement table.

7. Sensor arrangement (100) according to one of claims 1 to 5, characterised in that the optical sensor (1) has an input unit via which the codes of the correction mark (17) of the correction tape (16) can be entered.

8. Sensor arrangement (100) according to one of claims 1 to 7, characterised in that in the optical sensor (1) the codes of the correction mark (17) are translated into a correction value sequence which replaces the value range of the covered position mark (10).

9. Sensor arrangement (100) according to one of claims 1 to 4, characterised in that the value range of the correction marks (17) is not contained in the value range of the position marks (10), and / or in that the correction marks (17) differ from the position marks (10) with regard to an additional feature which can be detected by the optical sensor (1).

10. Sensor arrangement (100) according to claim 9, characterised in that the correction marks (17) form a sequence of values that differs from the sequence of positions contained in the position marks (10), wherein the sequences of the correction marks (17) and the position marks (10) can be distinguished by means of the optical sensor (1).

11. Sensor arrangement (100) according to one of claims 9 or 10, characterised in that at least one correction mark (17) contains a control code.

12. Sensor arrangement (100) according to one of claims 1 to 4, characterised in that the determination of position values of defective position marks (10) covered by correction marks (17) is carried out by means of formulas.

13. Sensor arrangement (100) according to one of claims 1 to 5, characterised in that the determination of position values of defective position marks (10) covered by correction marks (17) is carried out by searching for codes of the correction marks (17) in a correction table.

14. Sensor arrangement (100) according to one of claims 1 to 13, characterised in that correction marks (17) attached to a repair point on the position measuring system (2) can be configured in the optical sensor (1).

15. Sensor arrangement (100) according to claim 14, characterised in that the configuration is carried out by means of an input / output unit.

16. Sensor arrangement (100) according to claim 14, characterised in that correction marks (17) attached to a repair site on the position measuring system (2) are determined in a teach-in process by means of the optical sensor (1).

17. Sensor arrangement (100) according to claim 15, characterised in that the teach-in process can be carried out during operation of the optical sensor (1).

18. Sensor arrangement (100) according to one of claims 1 to 14, characterised in that the optical sensor (1) generates a warning message when correction marks (17) attached to a repair site are detected.

19. Sensor arrangement (100) according to claim 18, characterised in that the warning message is generated with a presettable delay time after the repair site has been applied.

20. Sensor arrangement (100) according to one of claims 18 or 19, characterised in that the warning message contains positions of the correction marks (17) on the position measuring system (2) and / or the time at which the repair site was applied.

21. Sensor arrangement (100) according to one of claims 1 to 20, characterised in that the position marks (10) and / or correction marks (17) are optical codes in the form of barcodes, 2D codes or 3D codes.

22. Sensor arrangement (100) according to one of claims 1 to 21, characterised in that the position marks (10) and / or correction marks (17) are formed in the form of embossed or different-coloured codes.

23. Sensor arrangement (100) according to one of claims 1 to 21, characterised in that the position marks (10) and / or correction marks (17) have invisible code structures.

24. Sensor arrangement (100) according to one of claims 1 to 23, characterised in that the position marks (10) and / or correction marks (17) each consist of at least two codes which are scanned by means of a multi-channel scanning system.

25. Sensor arrangement (100) according to one of claims 1 to 24, characterised in that the optical sensor (1) is a scanning sensor.

26. Sensor arrangement (100) according to one of claims 1 to 24, characterised in that the optical sensor (1) is a camera sensor.

27. Sensor arrangement (100) according to one of claims 1 to 26, characterised in that the optical sensor (1) is arranged on a vehicle.

28. Sensor arrangement (100) according to one of claims 1 to 27, characterised in that the position measuring system (2) is attached to a road boundary.

29. Method for operating a sensor arrangement (100) with a tape-shaped position measuring system (2), which has an arrangement of position marks (10), in which the positions of the position marks (10) within the position measuring system (2) are encoded as position values, and with an optical sensor (1) that is movable relative to the position measuring system (2), whereby the position of the optical sensor (1) relative to the position measuring system (2) can be determined by reading position marks (10) using the optical sensor (1), characterised in that the sensor arrangement (100) has a correction tape (16) which covers a defective sequence of position marks (10) of the position measuring system (2) is covered by the correction tape (16), wherein the correction tape (16) has a sequence of correction marks (17), wherein the correction marks (17) differ from the position marks (10), that the position values contained in the position marks (10) are stored in a position measurement table in the optical sensor (1), and that, in the case of a correction tape (16) covering defective position marks (10), the codes of the correction marks (17) of the correction tape (16) replace the value range of the position values of the defective position mark (10) in the position measurement table, or that the correction marks (17) form a value range from which the position values of the defective position marks (10) are determined in the optical sensor (1).