Radar installation angle adjustment method

Abstract

The present invention facilitates adjustment of the installation angle of a radar for traffic monitoring. This radar installation angle adjustment method is for adjusting an installation angle of an infrastructure-use radio wave radar for detecting an object in a target area, the method including: a first adjustment step for adjusting the angle of a radar installed at an installation target without operating the radar; and a second adjustment step for causing the radar, the angle of which has been adjusted in the first adjustment step, to operate, and adjusting the angle of the radar on the basis of detection results of the radar.

Description

Technical Field

[0001] The present disclosure relates to a method for adjusting the installation angle of a radar. This application claims priority based on Japanese Application No. 2021-004844 filed on January 15, 2021, and incorporates all the contents described in the above Japanese application.

Background Art

[0002] Patent Document 1 discloses a shaft adjustment device for adjusting the shaft of an in-vehicle radar mounted on a vehicle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] A method for adjusting the installation angle of a radar according to an aspect of the present disclosure is a method for adjusting the installation angle of a radar for detecting an object in a target area, including a first adjustment step of adjusting the angle of the radar without operating the radar installed on the installation target, and a second adjustment step of operating the radar whose angle has been adjusted in the first adjustment step and adjusting the angle of the radar based on the detection result by the radar.

[0005] The present disclosure can be realized not only as a method for adjusting the installation angle of a radar having the above characteristic steps, but also as a radar used in the method for adjusting the installation angle of a radar, or as a computer program for causing a computer to execute a part of the above method.

Brief Description of the Drawings

[0006] [Figure 1] It is a diagram showing an example of use of a radar according to an embodiment. [Figure 2]This is a perspective view showing an example of the external configuration of the radar according to the embodiment. [Figure 3] This is a flowchart showing an example of a method for adjusting the installation angle of a radar according to an embodiment. [Figure 4A] This is a perspective view showing another example of the external configuration of the radar according to the embodiment. [Figure 4B] This is a perspective view showing another example of the external configuration of the radar according to the embodiment. [Figure 4C] This is a perspective view showing another example of the external configuration of the radar according to the embodiment. [Figure 5] This is an example of the field of view of a sighting device. [Figure 6] This is a block diagram showing the connection relationships between devices when using an information terminal in the first adjustment step. [Figure 7] This is a block diagram showing the connection relationships between devices when using information terminals in the second adjustment step. [Figure 8A] This figure shows an example of displaying a vehicle's travel trajectory. [Figure 8B] This figure shows an example of displaying a vehicle's travel trajectory. [Figure 9] This figure shows an example of how the number of vehicles in each lane is displayed. [Modes for carrying out the invention]

[0007] <Issues this disclosure aims to address> Radar is also used for traffic monitoring at intersections, roads, etc. Traffic monitoring radar (hereinafter also called "infrastructure radar") is installed at intersections or on roads by construction personnel, and the angle of the installed radar is adjusted by adjustment personnel. At the time of installation by construction personnel, the radar is not connected to power, and furthermore, the construction personnel do not have the knowledge to adjust the angle of the radar, making adjustment by the construction personnel difficult. During the adjustment stage, the power is turned on to the installed radar, and the adjustment personnel adjust the angle so that the irradiation axis is pointed in the appropriate direction while checking the output. However, the angles of radars installed by construction personnel vary, and the optimal angle differs depending on the installation location, so adjustment was complicated, sometimes requiring the radar to be removed and reinstalled in order to adjust it correctly.

[0008] <Effects of this disclosure> According to this disclosure, the installation angle of the radar for traffic monitoring can be easily adjusted.

[0009] <Summary of the embodiments of this disclosure> The embodiments of this disclosure are outlined below.

[0010] (1) The radar installation method according to this embodiment is a radar installation angle adjustment method for adjusting the installation angle of an infrastructure radio radar that detects objects in a target area, and includes: a first adjustment step of adjusting the angle of the radar without operating the radar installed on the target; and a second adjustment step of operating the radar whose angle was adjusted in the first adjustment step and adjusting the angle of the radar based on the detection result by the radar. As a result, in the first adjustment step, the angle of the radar can be adjusted even if the radar is not powered on. Therefore, the construction worker who carried out the radar installation work can perform the first adjustment step, making it possible to easily adjust the installation angle of the radar. Note that "operation" as used herein means that the radar is able to perform its object detection function. In other words, even if an accessory part attached to the radar, such as the angle confirmation unit described later, is in an operational state, if the radar is unable to perform its object detection function, the radar is in an inoperable state.

[0011] (2) The first adjustment step includes determining whether the confirmation result in the angle confirmation unit attached to the radar satisfies a preset first condition, and the first adjustment step may be completed if the confirmation result satisfies the first condition. This allows the person performing the first adjustment step to easily determine when the first adjustment step is complete. Therefore, even a construction worker who does not have knowledge of radar adjustment can easily perform the first adjustment step.

[0012] (3) The angle confirmation unit is a sighting device, and the first condition may be that the field of view of the sighting device includes the target area. The completion of the first adjustment step can be easily determined by using the sighting device.

[0013] (4) The angle confirmation unit is an angle sensor that detects at least one of the horizontal angle and the depression angle of the radar, and the first condition may be that the angle detected by the angle sensor is within a predetermined set range. Thereby, by comparing the angle detected by the angle sensor with the set range, it is possible to clearly determine whether the first condition is satisfied. Therefore, it is possible to easily determine the completion of the first adjustment step.

[0014] (5) The first adjustment step may include determining the set range based on the angle detected by the angle sensor and the installation height of the radar. Thereby, an appropriate set range can be determined according to the angle detected by the angle sensor and the installation height of the radar.

[0015] (6) The set range may be determined by an information terminal that receives angle information indicating the angle detected by the angle sensor and height information indicating the installation height. Thereby, the information terminal can easily determine the set range.

[0016] (7) The angle confirmation unit is detachable from the radar, and in the first adjustment step, the angle confirmation unit may be attached to the radar. Thereby, the angle confirmation unit can be attached to the radar only when the first adjustment step is executed.

[0017] (8) The second adjustment step includes determining whether the detection result by the radar satisfies a preset second condition, and the second adjustment step may be completed when the detection result satisfies the second condition. Thereby, the executor of the second adjustment step can easily determine the completion of the second adjustment step.

[0018] (9) The second condition may be that the position of the object detected by the radar is within a predetermined range. Thereby, it is possible to clearly determine whether the second condition is satisfied according to the position of the object detected by the radar.

[0019] (10) The second condition may be that the difference between the number of objects detected by the radar and the number of objects in the target area falls within a predetermined set range. This makes it possible to clearly determine whether the second condition is met based on the number of objects detected by the radar.

[0020] <Details of the embodiments of this disclosure> The embodiments of the present invention will be described in detail below with reference to the drawings. At least some of the embodiments described below may be combined in any way.

[0021] [1. Radar] Figure 1 shows an example of the use of the radar according to this embodiment. The radar 100 according to this embodiment is a radio wave radar (infrastructure radio wave radar) for traffic monitoring. The radar 100 is attached to an arm 200 (see Figure 2) installed at an intersection or on a road. The radar 100 is a millimeter-wave radar and a radio wave sensor. The radar 100 detects objects (e.g., vehicles V) within the target area 300 by irradiating a target area 300 on the road with radio waves (millimeter waves) and receiving the reflected waves. More specifically, the radar 100 can detect the distance to a vehicle V traveling on the road, the speed of the vehicle V, and the horizontal angle of the position of the vehicle V with respect to the radar's radio wave irradiation axis.

[0022] The radar 100 is installed so that the direction of the radio wave irradiation axis (shown by the dashed line in Figure 1; hereinafter referred to as the "reference direction") faces the target area 300. If the reference direction is not correctly oriented towards the target area 300, the radar 100 cannot accurately detect objects within the target area 300. Therefore, in this embodiment, the angle of the radar 100 is adjusted so that the reference direction faces the target area 300 by the radar installation angle adjustment method described below.

[0023] Figure 2 is a perspective view showing an example of the external configuration of the radar 100 according to this embodiment. As shown in Figure 2, the radar 100 has a transmitting / receiving surface 101 that transmits and receives millimeter waves. The reference direction is the normal direction of the transmitting / receiving surface 101. The radar 100 incorporates at least one transmitting antenna and a plurality (e.g., two) receiving antennas, which are not shown. The radar 100 transmits a modulated wave, which is a millimeter wave, from the transmitting antenna through the transmitting / receiving surface 101. The modulated wave strikes an object and is reflected, and the receiving antenna receives the reflected wave. The radar 100 performs signal processing on the transmitted wave signal and the received wave signal using a signal processing circuit (not shown) to detect the distance to the object, the angle at which the object is located (hereinafter referred to as "the position of the object"), and the velocity of the object.

[0024] The radar 100 is configured to allow adjustment of its installation angle. The radar 100 includes a radar body 102, a depression angle adjustment unit 103, and a horizontal angle adjustment unit 104. The radar body 102 is box-shaped, and the depression angle adjustment unit 103 is attached to the side of the radar body 102. The depression angle adjustment unit 103 includes a pair of arms 103a and a connecting unit 103b that connects the pair of arms 103a. Each of the pair of arms 103a is rotatable on both sides of the radar body 102 about a horizontal axis parallel to the transmitting / receiving surface 101. The radar body 102 is rotatable about the horizontal axis by the depression angle adjustment unit 103, thereby adjusting the depression angle of the radar body 102.

[0025] The connecting section 103b is connected to the horizontal angle adjustment section 104. The horizontal angle adjustment section 104 is fixed to the pole to be installed. The horizontal angle adjustment section 104 is rotatable about the vertical axis on the upper surface of the connecting section 103b. The radar body 102, which is connected to the horizontal angle adjustment section 104 via the depression angle adjustment section 103, is rotatable about the vertical axis by the horizontal angle adjustment section 104, thereby adjusting the horizontal angle of the radar body 102.

[0026] [2. How to adjust the radar's installation angle] Figure 3 is a flowchart showing an example of a method for adjusting the installation angle of a radar according to this embodiment.

[0027] First, the construction worker installs the radar 100 on the installation target (pole) (Step S0). At this point, the radar 100 is not connected to a power source.

[0028] Next, the first adjustment step is performed (step S11). In the first adjustment step, the angle of the radar 100 is adjusted without the radar 100 being activated.

[0029] For example, the radar 100 is provided with an angle confirmation unit 400. In the first adjustment step, the angle confirmation unit 400 may be used. Figures 4A to 4C show an example of the angle confirmation unit 400 according to this embodiment.

[0030] In the example shown in Figure 4A, the angle confirmation unit 400 is the sight 400A. The sight 400A is fixed to the radar body 102 so that its optical axis (the central axis of the sight) is parallel to the reference direction of the radar 100. The user (e.g., construction worker) performs the first adjustment step while checking the field of view of the sight 400A. Figure 5 shows an example of the field of view of the sight 400A. In the example shown in Figure 5, the sight 400A is provided with a slit 410, and this slit 410 is the field of view of the sight 400A.

[0031] An information terminal may be used in the first adjustment step. Figure 6 is a block diagram showing the connection relationship between devices when an information terminal is used in the first adjustment step. The angle confirmation unit 400 is connected to the information terminal 500 by wire or wireless and transmits confirmation result data to the information terminal 500. The information terminal 500 is, for example, a smartphone, tablet, or laptop computer. If the angle confirmation unit 400 is a sighting device 400A, the sighting device 400A may include an image sensor and be capable of outputting a field of view image of the sighting device 400A. For example, the field of view image of the sighting device 400A is displayed on the display of the information terminal 500. The user can adjust the angle of the radar 100 while checking the field of view image displayed on the display of the information terminal 500. This allows the user to check the field of view of the sighting device 400A by the display of the information terminal 500 if the installation position of the radar 100 is such that the user cannot look into the sighting device 400A.

[0032] In the example shown in Figure 4B, the angle confirmation unit 400 is the angle sensor 400B. The angle sensor 400B can detect, for example, the horizontal angle and the vertical angle (depression angle). As shown in Figure 6, the angle sensor 400B is connected to the information terminal 500. The detected value (angle) data from the angle sensor 400B is transmitted to the information terminal 500. For example, the information terminal 500 can display the horizontal angle and depression angle detected by the angle sensor 400B on its display. Furthermore, the display of the information terminal 500 may also display the appropriate horizontal angle and depression angle of the radar 100, or the appropriate range of the horizontal angle and the appropriate range of the depression angle. The user can adjust the angle of the radar 100 while checking the horizontal angle and depression angle detected by the angle sensor 400B displayed on the display of the information terminal 500. The user can easily adjust the horizontal and downward angles to the appropriate values ​​by adjusting the angle of the radar 100 while comparing the horizontal and downward angles detected by the angle sensor 400B with the appropriate horizontal and downward angles or the appropriate range of the horizontal and downward angles.

[0033] The installation height (height from the ground) of the radar 100 may be input to the information terminal 500, and the information terminal 500 may determine the appropriate range of the depression angle based on the installation height. The appropriate depression angle of the radar 100 changes depending on the installation height of the radar. Therefore, the appropriate range of the depression angle according to the installation height of the radar 100 is set appropriately.

[0034] The angle confirmation unit 400 may be detachable from the radar body 102. For example, the radar body 102 may be provided with a mounting part for attaching and detaching the angle confirmation unit 400, and by attaching the angle confirmation unit 400 to the mounting part, the angle confirmation unit 400 may be mounted at an appropriate angle relative to the radar body 102. The angle confirmation unit 400 may be attached to the radar 100 when the first adjustment step is performed, for example, and removed from the radar 100 when the first adjustment step is completed.

[0035] In the example shown in Figure 4C, a smartphone 400C, which functions as an angle confirmation unit 400, is attached to the radar unit 102. The radar unit 102 is provided with a fixing unit 420 for securing the smartphone 400C. The smartphone 400C can be attached to and detached from the fixing unit 420. The built-in camera of the smartphone 400C can be used as a sighting device. Furthermore, the angle sensor (direction sensor and gyroscope sensor) built into the smartphone 400C can be used.

[0036] Refer to Figure 3 again. The user determines whether the confirmation result by the angle confirmation unit 400 satisfies a predetermined first condition (step S12).

[0037] If the angle confirmation unit 400 is a sighting device 400A, the first condition is that the field of view of the sighting device 400A includes the target area 300 (or at least a part of it). For example, if a point within the target area 300 is set as the adjustment point, the first condition can be that the adjustment point is included in the field of view. If the adjustment point is included in the field of view of the sighting device 400A, the user determines that the first condition is met. If the adjustment point is not included in the field of view of the sighting device 400A, the user determines that the first condition is not met.

[0038] If the angle confirmation unit 400 is an angle sensor 400B, the first condition is that the value detected by the angle sensor 400B falls within a predetermined set range. The set range can be the appropriate range described above. If the value detected by the angle sensor 400B falls within the set range, the user determines that the first condition is met. If the value detected by the angle sensor 400B falls outside the set range, the user determines that the first condition is not met.

[0039] If the angle confirmation unit 400 does not meet the first condition (NO in step S12), it is determined that the first adjustment step is not complete. In this case, the process returns to step S11 and the first adjustment step continues.

[0040] If the angle confirmation unit 400 confirms that the first condition is met (YES in step S12), it is determined that the first adjustment step is complete. In this case, the process proceeds to the next step S21.

[0041] The first adjustment steps S11 and S12 described above may be performed by the construction personnel when installing the radar 100 on the installation target. The first adjustment steps described above allow even construction personnel without knowledge of radar angle adjustment to easily adjust the angle of the radar 100. Furthermore, since the angle of the radar 100 is adjusted to be generally appropriate in the first adjustment step, in the subsequent second adjustment step, the adjustment personnel only need to make fine adjustments to the angle of the radar 100, thus reducing the burden of the adjustment work.

[0042] Next, the second adjustment step is performed (step S21). The second adjustment step is performed by the adjustment personnel in the process of adjusting the angle of the radar 100. During the angle adjustment, power is supplied to the radar 100. In the second adjustment step, the radar 100 is activated, and its angle is adjusted based on the detection results of the radar 100.

[0043] An information terminal may be used in the second adjustment step. Figure 7 is a block diagram showing the connection relationships between devices when an information terminal is used in the second adjustment step. The radar 100 is connected to the information terminal 600 by wire or wireless and transmits detection result data to the information terminal 600. The information terminal 600 is, for example, a smartphone, tablet, or laptop computer.

[0044] The detection results of the radar 100 are displayed on the display of the information terminal 600. For example, the information terminal 600 may process the detection data from the radar 100 and display the driving trajectory of the detected vehicle on the screen. Figures 8A and 8B show examples of the display of a vehicle's driving trajectory. As shown in Figures 8A and 8B, the screen includes lane boundary lines L, representing the lanes. Furthermore, the screen displays the driving trajectory of the detected vehicle V. In the figures, the dashed vehicle shape V1 indicates the position of a vehicle that was detected in the past, and the solid vehicle shape V2 indicates the most recent position of the vehicle. Since the vehicle's position is displayed in chronological order, the vehicle's driving trajectory is shown.

[0045] By checking the screen, the user can determine whether the detected vehicle's position falls within a predetermined range. In a specific example, the user can determine whether the detected vehicle's trajectory falls within a lane. Figure 8A shows a case where the detected vehicle's trajectory falls within a lane. In this case, it can be determined that the radar 100 is adjusted to the appropriate angle. Figure 8B shows a case where the detected vehicle's trajectory deviates from the lane. If the vehicle's trajectory deviates from the lane even though the vehicle has not changed lanes, it can be determined that the radar 100 is not adjusted to the appropriate angle. The user can adjust the angle of the radar 100 while checking the vehicle's trajectory displayed on the information terminal 600's display.

[0046] For example, the information terminal 600 may process the detection data from the radar 100 and display the number of detected vehicles in each lane on the screen. Figure 9 shows an example of displaying the number of vehicles in each lane. In the example in Figure 9, the number of vehicles (10, 15, 7, 20) is displayed in correspondence with the lane numbers (#1, #2, #3, #4). The user counts the number of vehicles in each lane by visual inspection and compares it with the number of vehicles in each lane displayed on the screen. If the number of vehicles in each lane confirmed by visual inspection matches the number of vehicles in each lane displayed on the screen, the user can determine that the radar 100 is adjusted to the appropriate angle. If the number of vehicles in each lane confirmed by visual inspection does not match the number of vehicles in each lane displayed on the screen, the user can determine that the radar 100 is not adjusted to the appropriate angle. The user can adjust the angle of the radar 100 while checking the number of vehicles displayed on the display of the information terminal 600.

[0047] Refer to Figure 3 again. The user determines whether the detection result by radar 100 satisfies a predetermined second condition (step S22).

[0048] For example, the second condition is that the position of the detected object (vehicle) is within a predetermined range. In the examples shown in Figures 8A and 8B, the second condition is that the trajectory of the detected vehicle is contained within the lane. If the trajectory of the detected vehicle is contained within the lane, the user determines that the second condition is met. If the trajectory of the detected vehicle deviates from the lane even though the vehicle has not changed lanes, the user determines that the second condition is not met.

[0049] For example, the second condition is that the difference between the number of detected objects (vehicles) and the number of objects (vehicles) within the target area 300 falls within a predetermined setting range. In the example shown in Figure 9, the second condition is that the difference between the number of detected vehicles per lane and the number of vehicles per lane confirmed by the user visually falls within the setting range. If the difference between the number of detected vehicles per lane and the number of vehicles confirmed by the user visually falls within the setting range, the user determines that the second condition is met. If the difference between the number of detected vehicles per lane and the number of vehicles confirmed by the user visually falls outside the setting range, the user determines that the second condition is not met. The setting range is preferably a range with a certain width, such as 5 or less, or 0 or more. This allows for a tolerance of counting errors and enables the determination of whether the radar angle has been accurately adjusted, for example, when it is difficult to accurately count the number of vehicles by visual inspection, such as when the camera contrast is low.

[0050] If the detection result by radar 100 does not satisfy the second condition (NO in step S22), it is determined that the second adjustment step is not complete. In this case, the process returns to step S21 and the second adjustment step continues.

[0051] If the detection result from radar 100 satisfies the second condition (YES in step S22), it is determined that the second adjustment step is complete. In this case, the adjustment of the installation angle of radar 100 is complete.

[0052] [3. Variant] In the embodiment described above, step S12, in which the user determines whether the confirmation result by the angle confirmation unit 400 satisfies the first condition, was performed by the user, but the embodiment is not limited to this. Step S12 may also be performed by the information terminal 500.

[0053] If the angle confirmation unit 400 is a sighting device 400A, for example, when the radar 100 is adjusted to the correct angle, an image of the scenery that comes into the field of view of the sighting device 400A is pre-stored as a standard image in the information terminal 500. The information terminal 500 matches the field of view image output from the sighting device 400A with the standard image, and determines that the first condition is met if the similarity between the two images is greater than or equal to a predetermined value, and determines that the first condition is not met if the similarity is less than the predetermined value.

[0054] If the angle confirmation unit 400 is an angle sensor 400B, for example, the appropriate range for the horizontal angle and the appropriate range for the depression angle of the radar 100 are pre-stored as set ranges in the information terminal 500. The information terminal 500 compares the detected values ​​of the horizontal angle and depression angle from the angle sensor 400B with the set ranges, and determines that the first condition is met if the detected values ​​fall within the set ranges, and that the first condition is not met if the detected values ​​fall outside the set ranges.

[0055] If the angle confirmation unit 400 is a smartphone 400C, step S12 may be performed by the smartphone 400C.

[0056] If the angle confirmation unit 400 is connected to a server via a communication network, step S12 may be executed by the server instead of the information terminal 500.

[0057] In the embodiment described above, step S22, which determines whether the detection result by radar 100 satisfies the second condition, was performed by the user, but is not limited to this. Step S22 may also be performed by the information terminal 600.

[0058] For example, the information terminal 600 calculates the vehicle's trajectory for each lane based on the detection data from the radar 100 and determines whether the vehicle's trajectory is contained within the lane. If the vehicle's trajectory is within the lane, it is determined that the second condition is met; if the vehicle's trajectory deviates from the lane, it is determined that the second condition is not met.

[0059] For example, the information terminal 600 detects the number of vehicles in each lane based on the detection data from the radar 100, and detects the number of vehicles in each lane by processing images from another detection means, such as a camera, and determines whether the two match. If the number of vehicles obtained from the detection data of the radar 100 matches the number of vehicles detected by the other detection means, it is determined that the second condition is met; if they do not match, it is determined that the second condition is not met.

[0060] If the radar 100 is connected to a server via a communication network, step S22 may be performed by the server instead of the information terminal 600.

[0061] [4. Effects] As described above, the installation angle adjustment method for radar 100 according to the embodiment adjusts the installation angle of radar 100, which is an infrastructure radio wave radar that detects vehicles V in the target area 300. The installation angle adjustment method for radar 100 includes a first adjustment step S11 and a second adjustment step S21. In the first adjustment step S11, the angle of radar 100 is adjusted without operating the radar 100 installed on the target. In the second adjustment step S21, the angle of radar 100, whose angle was adjusted in the first step, is operated, and the angle of radar 100 is adjusted based on the detection results from radar 100. As a result, in the first adjustment step S11, the angle of radar 100 can be adjusted even if the radar 100 is not powered on. Therefore, the construction worker who carried out the installation work of radar 100 can perform the first adjustment step S11, making it possible to easily adjust the installation angle of radar 100.

[0062] The first adjustment step S11 may include a step S12 that determines whether the confirmation result from the angle confirmation unit 400 attached to the radar 100 satisfies a preset first condition. The first adjustment step S11 may be completed if the confirmation result from the angle confirmation unit 400 satisfies the first condition. This allows the person performing the first adjustment step S11 (for example, the construction worker) to easily determine the completion of the first adjustment step S11. Therefore, even a construction worker who does not have knowledge of radar adjustment can easily perform the first adjustment step S11.

[0063] The angle confirmation unit 400 may be a sighting device 400A. The first condition may be that the field of view of the sighting device 400A is included in the target area 300. By using the sighting device 400A, it is easy to determine that the first adjustment step S11 has been completed.

[0064] The angle confirmation unit 400 may be an angle sensor 400B that detects at least one of the horizontal angle and depression angle of the radar 100. The first condition may be that the angle detected by the angle sensor 400B falls within a predetermined set range. By comparing the angle detected by the angle sensor 400B with the set range, it is possible to clearly determine whether or not the second condition has been met. Therefore, it is possible to easily determine that the first adjustment step S11 has been completed.

[0065] The first adjustment step S11 may include determining a setting range based on the angle detected by the angle sensor 400B and the installation height of the radar 100. This allows for the determination of an appropriate setting range according to the angle detected by the angle sensor 400B and the installation height of the radar 100.

[0066] The setting range may be determined by an information terminal 500 that receives angle information indicating the angle detected by the angle sensor 400B and height information indicating the installation height. This allows the information terminal 500 to easily determine the setting range.

[0067] The angle confirmation unit 400 may be detachable from the radar. In the first adjustment step S11, the angle confirmation unit 400 may be attached to the radar. This allows the angle confirmation unit 400 to be attached to the radar 100 only when the first adjustment step is performed.

[0068] The second adjustment step S21 may include determining whether the detection result by the radar 100 satisfies a pre-set second condition. The second adjustment step S21 may be completed if the detection result by the radar 100 satisfies the second condition. This allows the person performing the second adjustment step S21 (e.g., the adjustment officer) to easily determine the completion of the second adjustment step S21.

[0069] The second condition may be that the vehicle trajectory detected by the radar 100 is contained within the lane. This makes it possible to clearly determine whether the second condition has been met based on the vehicle trajectory detected by the radar 100.

[0070] The second condition may be that the difference between the number of vehicles in each lane detected by the radar 100 and the number of vehicles V in each lane within the target area 300 falls within a predetermined set range. This makes it possible to clearly determine whether the second condition is met based on the number of vehicles in each lane detected by the radar 100.

[0071] [5. Supplementary Notes] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims rather than by the embodiments described above, and includes the meaning of equivalents to the claims and all modifications within that scope. [Explanation of Symbols]

[0072] 100 radar 101 Transmitting and Receiving Surface 102 Radar Unit 103 Depression angle adjustment section 103a Arm 103b Connection part 104 Horizontal angle adjustment section 200 Arm 300 target areas 400 Angle confirmation section 400A Sight 400B Angle Sensor 400C Smartphone 410 Slits 420 Fixed part 500,600 information terminals L lane boundary line V Vehicle V1, V2 shapes

Claims

1. A method for adjusting the installation angle of an infrastructure radar used to detect objects in a target area, A first adjustment step involves adjusting the angle of the radar without operating the radar installed on the target, A second adjustment step involves operating the radar whose angle has been adjusted in the first adjustment step, and adjusting the angle of the radar based on the detection results from the radar, Includes, The second adjustment step includes determining whether each of the vehicle trajectories detected by the radar is included in each of the lanes, and the second adjustment step is completed if it is determined that each of the vehicle trajectories is included in each of the lanes. How to adjust the installation angle of a radar.

2. The first adjustment step includes determining whether the confirmation result from the angle confirmation unit attached to the radar satisfies a preset first condition, and the first adjustment step is completed if the confirmation result satisfies the first condition. A method for adjusting the installation angle of a radar according to claim 1.

3. The angle confirmation unit is a sighting device, The first condition is that the field of view of the sight is included in the target area. The method for adjusting the installation angle of a radar according to claim 2.

4. The angle confirmation unit is an angle sensor that detects at least one of the horizontal angle and depression angle of the radar, The first condition is that the angle detected by the angle sensor falls within a predetermined set range. The method for adjusting the installation angle of a radar according to claim 2.

5. The first adjustment step includes determining the setting range based on the angle detected by the angle sensor and the installation height of the radar. A method for adjusting the installation angle of a radar according to claim 4.

6. The setting range is determined by an information terminal that receives angle information indicating the angle detected by the angle sensor and height information indicating the installation height. A method for adjusting the installation angle of a radar according to claim 5.

7. The angle confirmation unit is detachable from the radar. In the first adjustment step, the angle confirmation unit is attached to the radar. A method for adjusting the installation angle of a radar according to any one of claims 2 to 6.

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