JP2022066794A - Distance display control device, distance display system, receiver, distance display control method, and distance display control program - Google Patents

Abstract

To reduce the effort required to display the distance from a construction site.SOLUTION: A distance display control device includes: a position information acquisition unit that acquires position information of a plurality of receivers that receive GNSS signals from the receivers; a display distance acquisition unit that acquires a distance between a receiver placed at a distance starting point and a receiver, having a display, placed at a distance display point, as a display distance based on the position information; and a display control unit that transmits the display distance to the receiver placed at the distance display point and displays the same on the display.SELECTED DRAWING: Figure 2

Description

The present invention relates to a distance display control device, a distance display system, a receiving device, a distance display control method, and a distance display control program.

Conventionally, at a construction site on a road, a notice of construction is given by indicating the distance to the construction site by a signboard or the like on the road in front of the construction site. For example, Patent Documents 1 and 2 disclose a signboard whose display contents can be changed by attaching and detaching a magnet sheet.

Japanese Unexamined Patent Publication No. 2001-350417 Japanese Unexamined Patent Publication No. 11-16212

At the construction site on the road, the position of the construction site may change according to the progress of the construction. Generally, when the position of the construction site changes, a sign indicating the distance to the construction site is moved. However, if the displayed distance is not corrected, it is necessary to move all the signboards according to the change in the position of the construction site, and it is necessary to adjust the position after the movement according to the displayed distance. On the other hand, if the display content can be changed as in the conventional technique, it is possible to reduce the number of movements and the distance of the signboard, but for the signboard that is not moved, the distance from the signboard to the construction site is specified. It is necessary to change the display content according to the distance.
The present invention has been made in view of the above problems, and an object of the present invention is to reduce the time and effort required to display the distance from the construction site.

In order to achieve the above object, the distance display control device is set to a distance starting point based on the position information acquisition unit that acquires the position information of the receiving device from a plurality of receiving devices that receive the GNSS signal and the position information. A display distance acquisition unit that acquires the distance between the arranged receiving device and the receiving device provided with a display and arranged at the distance display point as a display distance, and the display distance is arranged at the distance display point. It is provided with a display control unit that transmits the signal to the receiving device and displays it on the display.

That is, the distance display control device acquires the distance between the distance starting point and the receiving device provided with the display as a display distance based on the GNSS signal, and displays the distance on the display. According to this configuration, the display distance to be displayed on the display can be automatically determined. Therefore, no matter how the distance between the distance starting point and the receiving device changes, the display distance according to the change can be automatically determined and displayed. Therefore, by using the distance display control device and the receiving device on the road where the construction site exists, it is possible to reduce the time and effort for displaying the distance from the construction site.

1A and 1B are explanatory views showing an example of a signboard. 2A and 2B are diagrams for explaining an arrangement example of the receiving device. It is a figure explaining the structure of the receiving device and the distance display control device. It is a figure explaining the function of the receiving device and the distance display control device. It is a figure explaining the rearrangement of a receiving device. It is a flowchart which shows the process to be executed by a receiving device and a distance display control device. 7A and 7C are diagrams showing information collected from the receiving device, and FIG. 7B is a flowchart showing a sequence determination process. It is a flowchart of a display distance calculation process. FIG. 9A is a diagram illustrating an arrangement example of the receiving device, and FIG. 9B is a diagram showing information collected from the receiving device. FIG. 10A is a diagram illustrating an arrangement example of the receiving device, and FIG. 10B is a diagram showing information collected from the receiving device. It is a figure which shows the positional relationship of a receiving device. It is a figure explaining the arrangement example of the receiving apparatus. FIG. 13A is a diagram showing information collected from the receiving device, and FIG. 13B is a diagram showing the positional relationship of the receiving device.

Here, embodiments of the present invention will be described in the following order.
(1) Outline of distance display system:
(2) Configuration of distance display system:
(2-1) Function as a receiving device:
(2-2) Function as a distance display control device:
(3-1) Reception control processing:
(3-2) Distance display control process:
(3-3) Sequence determination process:
(3-4) Display distance calculation process:
(4) Second embodiment:
(5) Third embodiment:
(6) Fourth embodiment:
(7) Other embodiments:

(1) Outline of distance display system:
FIG. 1A is a diagram showing an example of a receiving device 100 used in the distance display system according to the embodiment of the present invention. In the present embodiment, the receiving device 100 is attached to the signboard 1a. The signboard 1a is a signboard that is arranged in front of the construction site (rear in the traveling direction) and displays precautions regarding the construction site.

The signboard 1a displays the distance to the construction site, and is provided with a display 20 for displaying the distance. In the signboard 1a shown in FIG. 1A, a numerical value "100" is displayed on the display panel 20a of the display 20, and the signboard 1a indicates that the distance from the position where the signboard 1a is arranged to the construction site is 100 m. ing.

At the construction site, a plurality of signboards 1a are prepared and arranged on the road in order to call attention to vehicles traveling on the road in front of the construction site. FIG. 2A is a diagram showing an example of arrangement of the receiving device 100 on the road RD. In the example shown in FIG. 2A, the road RD is a road in the direction of travel from the left to the right in the drawing. In the example shown in FIG. 2A, a work vehicle Ve equipped with a display device DD is parked on the road RD, and a point P ₀ adjacent to the rear of the work vehicle Ve is a construction site. The display device DD is a device that displays information or the like indicating that construction is underway.

The signboards 1a are installed at a plurality of places, and each signboard 1a indicates the distance to the construction site. In FIG. 2A, the receiving devices attached to the signboards 1a are referred to as receiving devices 100a, 100b, 100c, 100d from the front. Further, in the example shown in FIG. 2A, the signboard 1a provided with the receiving device 100a is arranged at the construction site, and the signboard 1a provided with the receiving devices 100b, 100c, 100d is located at 50m, 100m, 150m in front of the construction site. Have been placed. Therefore, 0m, 50m, 100m, and 150m are displayed on the displays 20 connected to the receiving devices 100a, 100b, 100c, and 100d, respectively.

In the present embodiment, when the predetermined work is completed at the construction site, the work vehicle Ve is moved forward on the road RD. Then, the work is newly started at the _point P1 adjacent to the rear of the work vehicle Ve after the movement. FIG. 2B shows a state after the work vehicle Ve has moved forward on the road RD shown in FIG. 2A. In this case, since the distance between the work vehicle Ve and each signboard 1a changes, if the display content of each signboard 1a is not changed, all the signboards 1a are moved, and each signboard 1a and the position of the construction site are located. It is necessary to adjust the position after movement so that the distance to and from is the distance displayed on each signboard 1a. The displayed distance may be changed without moving each signboard 1a, but if the moving distance of the work vehicle Ve increases to some extent, the signboard 1a will be moved. In this case, as the signboard 1a moves, the displayed distance is also corrected.

In this way, the work of moving all of the signboard 1a and adjusting the position after the movement is a very laborious work for the worker. The work of measuring the distance displayed on the signboard 1a and changing the display is also a very laborious work for the worker. Therefore, in the present embodiment, a configuration is adopted in which the distance to be displayed on the display 20 of the signboard 1a is automatically specified and displayed.

For example, when the work vehicle Ve is moved as shown in FIG. 2B, the signboard 1a provided with the receiving device 100a existing at the head is moved forward, and the receiving device 100d existing at the end (100d0 shown in FIG. 2B) is moved forward. The work is performed so that the signboard 1a provided with the above is moved to the second position from the front. In this case, the signboard 1a provided with the receiving devices 100b and 100c does not have to be moved.

In this way, even when the signboards 1a provided with the receiving devices 100a, 100d, 100b, 100c are arranged in order from the beginning, the distance from the construction site to each signboard 1a is automatically measured and displayed on the display 20. Will be done. As a result, as shown in FIG. 2B, the numerical value of the display 20 of the signboard 1a provided with the receiving device 100d is corrected from 150 m to 50 m. The numerical values of the display 20 of the signboard 1a provided with the receiving devices 100b and 100c are corrected to 100 m and 150 m, respectively.

In the present embodiment, since the distance displayed on the display 20 can be automatically determined, even if the operator arranges the signboard 1a without adjusting the position in detail, for example, it is shown in FIG. 2A. Such distances are automatically determined and displayed. Therefore, it is possible to reduce the time and effort for the worker to measure the distance from the construction site to the signboard 1a. Further, when the work vehicle Ve moves from the state shown in FIG. 2A and the signboards 1a are rearranged as shown in FIG. 2B, the distance is automatically determined and displayed. Therefore, it is possible to reduce the time and effort for the worker to measure the distance from the construction site to the signboard 1a. In addition, the time and effort required to move the signboard 1a can be reduced.

(2) Configuration of distance display system:
In order to automatically display the distance from the construction site on the display 20, the distance display system according to the present embodiment includes a receiving device 100 and a distance display control device 200. In the present embodiment, the receiving device 100 and the distance display control device 200 are realized by the same hardware configuration. In the present embodiment, when the device functions as the distance display control device 200, it also functions as the receiving device 100.

FIG. 3 shows a hardware configuration of a device that can function as a receiving device 100 and a distance display control device 200. Hereinafter, the configuration of the receiving device 100 will be mainly described, but the hardware configuration of the distance display control device 200 is the same as that of the receiving device 100. The apparatus according to this embodiment includes a GNSS module 11, a wireless communication module 12, a CPU 13, a memory 14, switches 15a to 15c, and a display 20, and is driven by a power source (not shown).

The CPU 13 executes a program recorded in the memory 14, executes various arithmetic processes based on various input signals, and outputs various output signals. The GNSS module 11 is a module including a circuit for receiving a GNSS signal from a navigation satellite, and outputs a GNSS signal to the CPU 13. The CPU 13 acquires the position information (coordinate information) of the receiving device 100 based on the GNSS signal.

The wireless communication module 12 is a module including a circuit for performing wireless communication with another device according to a predetermined wireless communication standard. The CPU 13 can control the wireless communication module 12 to communicate with an external device and exchange various information. The memory 14 is an information storage medium, and the CPU 13 can refer to various information stored in the memory 14 and can store various information in the memory 14.

The switches 15a to 15c may be realized by any type of switch. The user can give various instructions to the receiving device 100 by operating the switches 15a to 15c. The switch 15a is a switch for switching the role of the device. In the present embodiment, the roles of the receiving device 100 include a master and a slave. When it is a master, it functions as a receiving device 100 and at the same time functions as a distance display control device 200. Then, the distance display control device 200 determines the distance to be displayed on the display 20 of each receiving device 100 (hereinafter referred to as a display distance). When it is a slave, it functions as a receiving device 100, but does not function as a distance display control device 200. In FIGS. 2A, 2B, etc., (M) is added to the receiving device 100 that functions as a master, and (S) is added to the receiving device 100 that functions as a slave.

The switch 15b is a reset switch for resetting the distance displayed on the display 20 and giving an instruction to reacquire and update the display. In the present embodiment, the distance is reset, reacquired, and updated at predetermined intervals, but the user can forcibly update the display by operating the switch 15b. Is.

The switch 15c is a switch for inputting a setting in each device. The settings that can be input include the group to which the receiving device 100 belongs, the on / off of the flag indicating whether or not the distance is calculated, and the like. In the first embodiment, since the control according to these settings is not performed, the details of the switch 15c will be described later in other embodiments.

The receiving device 100 includes a display 20 as shown in FIG. The display 20 includes a display panel 20a and a panel control unit 20b. The display 20 is attached to the signboard 1a so that the display panel 20a can be visually recognized from the opening provided in the upper part of the signboard 1a (see FIG. 1A). The receiving device 100 and the display 20 are connected by wiring (not shown), and the receiving device 100 can be attached to an arbitrary position on the signboard 1a. In the present embodiment shown in FIG. 1A and the like, the receiving device 100 is attached to the upper part of the signboard 1a.

The panel control unit 20b is a circuit that controls the display panel 20a. The panel control unit 20b receives image data indicating a display distance from the CPU 13 via an interface (not shown). Then, the panel control unit 20b controls the display panel 20a based on the image data, and causes the display panel 20a to display the display distance. As a result, the distance to the construction site is displayed on the signboard 1a. Although the information displayed on the display panel 20a in the present embodiment is a numerical value, any information may be displayed.

(2-1) Function as a receiving device:
As described above, the device according to the present embodiment behaves as a single receiving device 100 or as both a receiving device 100 and a distance display control device 200, depending on the setting by the switch 15a. Here, the behavior of the receiving device 100 will be described with reference to FIG. FIG. 4 is a diagram for explaining the functions of the device that behaves as the receiving device 100 and the distance display control device 200. In FIG. 4, a subscript -1 or -2 is added to the GNSS module 11 or the like in order to distinguish the hardware of the receiving device 100 and the distance display control device 200.

The receiving device 100 acting as a slave is arranged at a distance display point for displaying the distance from the construction site. When the receiving device 100 behaves as a slave, the CPU 13-1 executes a program for realizing the function as the receiving device. Here, the program is referred to as a receiver control program 110. When the receiving device control program 110 is executed, the CPU 13-1 functions as a receiving unit 110a, a position information transmitting unit 110b, and a display distance receiving unit 110c.

The receiving unit 110a is a function of receiving a GNSS signal. That is, the CPU 13-1 controls the GNSS module 11-1 by the function of the receiving unit 110a to acquire the GNSS signal. The position information transmission unit 110b is a function of transmitting the position information indicated by the GNSS signal to the distance display control device. In the present embodiment, the CPU 13-1 transmits the position information when the distance display control device 200 requests the transmission of the position information.

Specifically, the CPU 13-1 acquires position information (in this embodiment, coordinate information consisting of latitude and longitude) indicating the current location of the receiving device 100 based on the GNSS signal by the function of the position information transmitting unit 110b. do. Further, the CPU 13-1 associates the identification information associated with itself as the information for identifying the receiving device 100 with the position information. Then, the CPU 13-1 transmits the identification information and the position information to the distance display control device 200 via the wireless communication module 12-1 by the function of the position information transmission unit 110b. The distance display control device 200 acquires the display distance based on the position information and returns.

For example, in the example shown in FIG. 2A, the receiving devices 100b, 100c, and 100d are slaves, and the receiving device 100a is a master. Therefore, the receiving device 100a also functions as the distance display control device 200. When the processing in the position information transmitting unit 110b is performed in the receiving device 100b, the identification information of the receiving device 100b and the position information indicating the current location of the receiving device 100b are transferred from the receiving device 100b as the distance display control device 200. Is transmitted to a functioning receiver 100a.

When the position information is transmitted, in the receiving device 100a that also functions as the distance display control device 200, the current location of the distance display control device 200 is set as the distance starting point, and the distance from the distance starting point to the current location of the receiving device 100 is set. Obtained as the display distance. Further, the distance display control device 200 returns the acquired display distance to the receiving device 100b. The details of acquiring the display distance will be described later. The above processing is performed in each of the receiving devices 100b, 100c, 100d.

Returning to the description of FIG. The display distance receiving unit 110c is a function of receiving the display distance. That is, when the display distance is returned from the distance display control device 200, the CPU 13-1 acquires the display distance via the wireless communication module 12-1. Then, the CPU 13-1 controls the display 20-1, and causes the display 20-1 to display the display distance. According to the above processing, for example, the display 20 of the receiving devices 100b, 100c, 100d shown in FIG. 2A displays the distances of 50 (m), 100 (m), and 150 (m) from the construction site. ..

(2-2) Function as a distance display control device:
When the device behaves as a master, the CPU 13-2 executes a program for realizing the function as the distance display control device 200 in addition to the receiving device 100. Here, the program is referred to as a distance display control program 210. When the distance display control program 210 is executed, the CPU 13-2 functions as a position information acquisition unit 210a, a display distance acquisition unit 210b, and a display control unit 210c, as shown in FIG.

The position information acquisition unit 210a is a function of acquiring the position information of the receiving device from the plurality of receiving devices 100. That is, the CPU 13-2 wirelessly communicates with each receiving device 100 via the wireless communication module 12-2 by the function of the position information acquisition unit 210a, and makes a transmission request for transmitting the position information of each receiving device 100. .. As described above, each receiving device 100 acquires and transmits the position information indicating the current location of the receiving device 100 in response to the transmission request. As a result, the CPU 13-2 acquires the position information of each receiving device 100.

The distance display control device 200 in the present embodiment also functions as a receiving device 100 arranged at the distance starting point. Therefore, the CPU 13-2 controls the GNSS module 11-2 by the function as the receiving device 100 to acquire the GNSS signal, and acquires the position information indicating its own current location. The CPU 13-2 considers the position information to be the current location of the receiving device 100 arranged at the distance starting point. In FIG. 4, the signal flow when acquiring the GNSS signal from the GNSS module 11-2 is shown by a broken line arrow.

The display distance acquisition unit 210b is a function of acquiring the distance between the receiving device 100 arranged at the distance starting point and the receiving device 100 arranged at the distance display point as the display distance based on the position information. In the present embodiment, the CPU 13-2 acquires the display distance by calculating the distance along the road between the two receiving devices 100. Specifically, the CPU 13-2 acquires the display distance by accumulating the inter-device distances of the receiving devices 100.

In order to acquire the display distance in this way, in the present embodiment, the CPU 13-2 acquires the order on the road of each receiving device 100 including the receiving device 100 arranged at the distance starting point. The sequence is defined so that the receiving device that exists at the frontmost along the traveling direction on the road and is located at the distance starting point is the first, and thereafter, the number increases as the distance is behind the traveling direction on the road. Will be done. In the present embodiment, the CPU 13-2 can determine the sequence at any timing, and even if the order of the receiving devices 100 changes, the sequence after the change can be specified. Details of the determination of the order will be described later.

FIG. 5 is a diagram schematically showing the positions of the receiving devices 100a to 100d shown in FIGS. 2A and 2B. In FIG. 5, the receiving devices 100a to 100d shown in the left column correspond to FIG. 2A, and the receiving devices 100a to 100d shown in the right column correspond to FIG. 2B. In FIG. 5, identification information and a sequence are added to the receiving devices 100a to 100d. That is, the identification information (ID) of each of the receiving devices 100a to 100d is 1 to 4.

In FIG. 2A, the receiving devices are arranged on the road in the order of the receiving devices 100a, 100b, 100c, 100d from the beginning. In FIG. 5, the sequence is indicated by n, and as shown in the left column of FIG. 5, the sequence of the receiving devices 100a, 100b, 100c, and 100d is the first, second, third, and fourth, respectively. Is. Note that x in FIG. 5 indicates that the receiver is located at the distance starting point.

In this way, in the state where the order is determined, the CPU 13-2 acquires the inter-device distance based on the position information of each receiving device 100 by the function of the display distance acquisition unit 210b. That is, the CPU 13-2 acquires the distance between the n-th receiving device 100 and the n + 1th receiving device 100 as the inter-device distance based on the position information. The CPU 13-2 repeatedly executes the above processing until n becomes N-1 (N is the number of receiving devices 100), thereby acquiring all the inter-device distances between the receiving devices 100.

In the example shown in the left column of FIG. 5, the CPU 13-2 has a device-to-device distance La1 between the first receiving device 100a and the second receiving device 100b, the second receiving device 100b, and the third receiving device 100b. The inter-device distance La2 between the receiving device 100c and the inter-device distance La3 between the third receiving device 100c and the fourth receiving device 100d are acquired.

Further, the CPU 13-2 accumulates the inter-device distance until n becomes N-1 when acquiring the display distance of the N-th arranged receiving devices 100. That is, when acquiring the display distance of the receiving devices 100 arranged in the Nth position, the CPU 13-2 accumulates the inter-device distances related to the receiving devices 100 before the Nth position. For example, in the example shown on the left side of FIG. 5, when the display distance of the third receiving device 100c is acquired, since N = 3, the distance between the devices is accumulated until n becomes 2. Therefore, the display distance is acquired by accumulating the inter-device distance La1 between the first and second receiving devices and the inter-device distance La 2 between the second and third receiving devices.

By executing the above processing for each receiving device, the display distance is acquired as follows.
Second receiver 100b: Display distance = La1
Third receiving device 100c: Display distance = La1 + La2
Fourth receiving device 100d: Display distance = La1 + La2 + La3

As described above, in the present embodiment, the display distance of the Nth receiving device 100 is calculated not by the linear distance between the receiving device 100 and the Nth receiving device 100 at the distance starting point, but by the accumulation of the distances between the devices. are doing. Therefore, even if the receiving device 100 is arranged along a curved road, the display distance can be specified by an approximate value of the distance along the road.

Returning to the description of FIG. The display control unit 210c is a function of transmitting the display distance to the receiving device 100 arranged at the distance display point and displaying it on the display 20. That is, the CPU 13-2 transmits the display distance of each receiving device 100 with each of the receiving devices 100 in the second to Nth order as the transmission destination by the function of the display control unit 210c. As a result, in each receiving device 100, the received display distance is displayed on the display 20-1. In the example shown in FIG. 2A, since La1, La2, and La3 shown in FIG. 5 are all 50 m, the display 20-1 of the second receiving device 100b is 50 (m), and the third receiving device 100c. 100 (m) is displayed on the display 20-1, and 150 (m) is displayed on the display 20-1 of the fourth receiving device 100d.

The distance display control device 200 in the present embodiment also functions as a receiving device 100 and includes a display 20-2. Therefore, the CPU 13-2 controls the display 20-2 by the function of the display control unit 210c to display the display distance of the receiving device 100 at the distance starting point (first forward row), that is, 0 (m). In FIG. 4, the signal flow for the display is indicated by a broken line arrow.

In the present embodiment, the CPU 13-2 acquires the display distance according to the elapse of a predetermined period or an instruction by the user by the function of the display distance acquisition unit 210b. That is, when the predetermined period elapses, the CPU 13-2 automatically acquires the position information of each receiving device 100 and reacquires the sequence, and displays the display distance of each receiving device 100 based on the position information and the sequence. get.

Further, the user can instruct the reset of the display distance by the switch 15b. In this case as well, the CPU 13-2 acquires the position information of each receiving device 100 and reacquires the sequence, and acquires the display distance of each receiving device 100 based on the position information and the sequence. The switch 15b instructing the reset of the display distance may be operated by the receiving device 100 as a master or may be operated by the receiving device 100 as a slave. In the latter case, the instruction given by the switch 15b is transmitted to the receiving device 100 (that is, the distance display control device 200) as the master via the wireless communication module 12.

In any case, when a new display distance is acquired, the CPU 13-2 uses the function of the display control unit 210c to set each of the second to Nth order receiving devices 100 as a transmission destination, and each receiving device 100. Send a new display distance for. Further, the CPU 13-2 controls the display 20-2 to display 0 (m). According to the above processing, the display distance of the display 20 of each receiving device 100 is updated so that the distance corresponds to the latest order. Therefore, even if the receiving device 100 is moved and rearranged according to the progress of the construction, the display distance is automatically calculated and updated to the correct value.

The column on the right side of FIG. 5 shows the positional relationship, identification information, and sequence of the receiving devices 100a to 100d when the sequence shown in FIG. 2A is rearranged into the sequence shown in FIG. 2B. That is, in the example shown in FIG. 2B, the receiving device 100a is moved to the position of the construction site in response to the movement of the construction site forward in the traveling direction of the road (arrow A in FIG. 5). Along with this, the receiving device 100d arranged at the end is moved to the position where the receiving device 100a existed before the movement (arrow B in FIG. 5).

After such a rearrangement is performed, when a predetermined period elapses or the user instructs by the switch 15b, the CPU 13-2 reacquires the order and the display distance of each receiving device 100. Then, the CPU 13-2 causes the display 20 of each receiving device 100 to display the display distance. As a result, the display distance is updated on the display 20 of each receiving device 100, and the distance from the construction site after rearrangement is indicated. In the example shown in FIG. 2B, since La4, La5, and La6 shown in FIG. 5 are all 50 m, the display 20-2 of the first receiving device 100a is 0 (m), and the second receiving device 100d is displayed. 50 (m) is displayed on the display 20-1, 100 (m) is displayed on the display 20-1 of the third receiving device 100b, and 150 (m) is displayed on the display 20-1 of the fourth receiving device 100c. ..

According to the present embodiment as described above, the distance between the receiving device 100 arranged at the distance starting point and the receiving device 100 arranged at the distance display point is automatically acquired and displayed on the display 20. Therefore, it is not necessary for the operator to measure the distance when the receiving device 100 is initially arranged on the road or when the receiving device 100 is moved due to the movement of the construction site. In addition, it is not necessary to write the display distance on the signboard 1a or replace the magnet sheet or the like indicating the numerical value. Therefore, it is possible to reduce the time and effort required to display the distance from the construction site.

Further, in the present embodiment, even when the receiving devices 100 are rearranged, the display distance according to the rearranged arrangement can be automatically acquired and displayed. Therefore, even if the construction site moves, the worker only needs to move the receiving device 100, and does not need to perform complicated work to display the distance.

Further, in the present embodiment, since the display distance is updated, the labor for moving the receiving device 100 can be reduced. For example, it is assumed that the state shown in FIG. 2A is rearranged from the state shown in FIG. 2B. With conventional signboards whose display distance cannot be changed, when the construction site moves forward, it is necessary to move all the signboards forward according to the moving distance. However, in the present embodiment, since the display distance according to the rearranged order is reacquired, it is not necessary to move all the receiving devices. For example, in the example shown in FIG. 2B, the receiving devices 100a and 100d may be moved, and it is not necessary to move the receiving devices 100b and 100c.

(3-1) Reception control processing:
Next, the reception control process executed by the receiving device 100 acting as a slave will be described. FIG. 6 is a process started in the apparatus shown in FIG. 3 every time a predetermined period elapses or when an instruction is given by the switch 15b. As described above, the device shown in FIG. 3 according to the present embodiment can behave as a single receiving device 100, and can also behave as a receiving device 100 and a distance display control device 200. Therefore, common processing is executed until these roles are determined.

Specifically, the CPU 13 acquires identification information and settings (step S10). That is, the CPU 13 acquires the identification information (ID) for each receiving device 100 recorded in the memory 14. Further, the CPU 13 specifies the role (master or slave) of the device by specifying the state of the switch 15a.

Next, the CPU 13 determines whether it is a master or a slave based on the setting contents (step S20). When set to slave, the CPU 13 executes steps S100 to S125 (receiver control program 110 described above). When set to the master, the CPU 13 executes steps S200 to S230 (distance display control program 210 described above).

Here, the processing when it is set to the slave will be described. In the following, the process will be described using the reference numerals shown in FIG. In the receiving device 100 set as the slave, the CPU 13-1 acquires the position information based on the GNSS signal (step S100). That is, the CPU 13-1 acquires the GNSS signal via the GNSS module 11-1 by the function of the receiving unit 110a. Further, the CPU 13-1 acquires the position information of the receiving device 100 based on the GNSS signal by the function of the position information transmitting unit 110b. When acquiring the position information, the position information may be fixed by waiting until the difference between the position information acquired within the predetermined period converges to the default value or less (the same applies to step S200 described later). According to this configuration, it is possible to prevent the position information from being acquired during movement due to rearrangement or the like.

Next, the CPU 13-1 transmits the identification information and the position information to the distance display control device 200 by the function of the position information transmission unit 110b (step S105). That is, the CPU 13-1 monitors whether or not a position information transmission request is made from the distance display control device 200. When the transmission request is made, the CPU 13-1 associates the identification information acquired in step S10 with the position information acquired in step S100, and sends the distance display control device 200 to the distance display control device 200 via the wireless communication module 12-1. Send to.

When the position information is transmitted, the distance display control device 200 calculates a display distance which is a distance between the receiving device 100 arranged at the distance starting point and the receiving device 100 arranged at the distance display point. Reply to each receiver. Therefore, in each receiving device 100, the CPU 13-1 acquires the display distance from the distance display control device 200 by the function of the display distance receiving unit 110c (step S120). That is, the CPU 13-1 acquires a display distance indicating the distance from itself to the construction site.

Next, the CPU 13-1 displays the display distance by the function of the display distance receiving unit 110c (step S122). That is, the CPU 13-1 controls the display 20-1 to display the display distance. As a result, in the receiving device 100, the distance from the construction site to the receiving device 100 is displayed on the display 20-1. When the above processing is completed, the CPU 13-1 transmits an installation completion notification to the distance display control device 200 (step S125). That is, the CPU 13-1 transmits information for confirming in the distance display control device 200 whether or not the display is normally completed in all the receiving devices to the distance display control device 200. If the predetermined time elapses without completing the processes of steps S120 and S122, the CPU 13-1 may consider it as an error and repeat the processes of steps S100 and subsequent steps.

(3-2) Distance display control process:
Next, a reception control process executed by a device that functions as a master, that is, as a distance display control device 200 in addition to the reception device 100, will be described. When it is determined in step S20 of the process shown in FIG. 6 that the master is set, the CPU 13 executes steps S200 to S230 (distance display control program 210 described above).

In step S200, the CPU 13-2 acquires position information based on the GNSS signal. That is, the CPU 13-2 acquires the GNSS signal via the GNSS module 11-2 by the function of the position information acquisition unit 210a. Further, the CPU 13-2 acquires the position information of the receiving device 100 acting as a master based on the GNSS signal by the function of the position information acquisition unit 210a. The acquired information is stored in the memory 14.

FIG. 7A is a diagram showing an example of information stored in the memory 14 in the example shown in FIG. 2A. As shown in FIG. 7A, the memory 14 of the distance display control device 200 stores the identification information of each device in association with the position information, the distinction between the master (M) and the slave (S), and the sequence. Will be done. In step S200, since the CPU 13-2 acquires the position information of the distance display control device 200 that functions as the master (M), the CPU 13-2 is located at the identification information of the distance display control device 200 (ID: 1 in the example shown in FIG. 7A). Information (X ₁ , Y ₁ ) is associated and stored. Further, in the present embodiment, since the distance display control device 200 is the master and is the receiving device 100 arranged at the distance starting point, the CPU 13-2 has a flag (1) indicating that it is the master. The fact that it is the first order is stored in association with the identification information. At the stage of step S200, information other than the master (M) is not specified.

Next, the CPU 13-2 acquires the identification information and the position information from each receiving device (step S205). That is, the CPU 13-2 requests each receiving device to transmit position information via the wireless communication module 12-2. As a result, the CPU 13-2 acquires the identification information and the position information transmitted from the receiving device 100 arranged at the distance display point on the road. Here, too, the acquired information is stored in the memory 14. That is, information is recorded for each slave receiving device 100 shown in FIG. 7A. Specifically, a flag (X2, _Y2 ) to _{( X4} , Y4) indicating that the identification information is a slave is associated with _each of the receiving devices ID2 to ID4. 0) is associated and stored. In the present embodiment, all receiving devices other than the master are set to slaves, but information indicating that they are masters or slaves may be transmitted from the receiving device 100.

At the stage when step S205 is completed, the order of the receiving device 100 that functions as a slave has not been specified. Therefore, the CPU 13-2 determines the order of the receiving devices by the function of the display distance acquisition unit 210b (step S210). The process for determining the order will be described later. When the order of the receiving devices is determined, the order of the receiving devices 100 functioning as slaves is also determined in the information shown in FIG. 7A.

Therefore, the CPU 13-2 calculates the display distance by the function of the display distance acquisition unit 210b (step S215). The process for calculating the display distance will be described later. When the display distance is determined, the CPU 13-2 transmits the display distance to each receiving device by the function of the display control unit 210c (step S220). That is, since the display distance is specified for each of the receiving devices 100, the CPU 13-2 is 2 for each of the second to Nth receiving devices 100 via the wireless communication module 12-2. The display distance of the Nth receiving device 100 is transmitted.

Next, the CPU 13-2 performs a process of receiving a completion notification from the receiving device (step S225). Then, the CPU 13-2 determines whether or not the completion notification has been received from all the receiving devices (step S230), and if it is not determined that the completion notification has been received from all the receiving devices, the processing after step S205 is repeated. That is, if it is not determined that the completion notification has been received from all the receiving devices, it is considered that the display distance may not be displayed properly, and the processing after step S205 is repeated. In this case, the slave information in the information shown in FIG. 7A is initialized and recorded again in the processing process after step S205.

(3-3) Sequence determination process:
Next, the order sequence determination process in step S210 will be described. FIG. 7B is a flowchart of the order sequence determination process for determining the order sequence of the receiving device. In the sequence determination process, the CPU 13-2 sets the variable n indicating the sequence to 1 (step S300). n = 1 indicates the first, that is, the receiving device 100 arranged at the distance starting point, and in the present embodiment, the master functioning as the receiving device 100 and the distance display control device 200 is the first. At this stage, the order is undecided except for the receiving device of the first order.

Next, the CPU 13-2 determines whether or not the n-th closest receiving device 100 is the n-1st (step S305). That is, the CPU 13-2 refers to the information stored in the memory 14, compares the position information of the nth receiving device 100 with the position information of the other receiving device 100, and identifies the closest receiving device 100. Then, the CPU 13-2 determines whether or not the nearest receiving device 100 is the n-1st. In the example shown in the left column of FIGS. 2A and 5 (distances between devices are all equal to 50 m), the reception in which step S305 is executed with n = 1 is the closest to the first receiving device 100a. The device is identified as the ID2 receiving device 100b. At this stage, since the order of the receiving device 100b of ID2 is undecided, the CPU 13-2 determines that the nth closest receiving device 100 is not the n-1th.

If it is not determined in step S305 that the nth closest receiving device 100 is the n-1st, the CPU 13-2 sets the nth closest receiving device 100 to the n + 1st position (step S310). In the example shown in the left column of FIGS. 2A and 5, when n = 1, the receiving device 100b having the ID 2 closest to the first receiving device 100a is set second.

Next, the CPU 13-2 determines whether or not the receiving device 100 whose order is undecided exists (step S325). If it is not determined in step S325 that the receiving device 100 whose order is undecided exists, the CPU 13-2 returns to the flow shown in FIG. When it is determined in step S325 that the receiving device 100 whose order is undecided exists, the CPU 13-2 increments the variable n (step S330) and repeats the processes after step S305. In the example shown in the left column of FIGS. 2A and 5, when n = 1, since the order of the receiving devices 100 of ID3 and ID4 is undecided, it is determined in step S325 that the receiving device 100 whose order is undecided exists. .. Therefore, the variable n becomes 2, and steps S305 and subsequent steps are repeated.

On the other hand, when it is determined in step S305 that the n-th closest receiving device 100 is the n-1th, the CPU 13-2 identifies the receiving device whose order is undecided, which is the second closest to the nth (step S315). ). That is, the CPU 13-2 refers to the information stored in the memory 14, compares the position information of the nth receiving device 100 with the position information of the other receiving device 100, and determines the order closest to the nth to the second. The receiving device 100 of the above is specified. In the example shown in the left column of FIGS. 2A and 5, when n = 2, the distance from the second receiving device 100 is the same for the receiving device 100 of ID1 and ID3, and is the minimum. Therefore, in step S305, it is determined that the receiving device closest to the second receiving device 100 is the receiving device 100 with ID1 and ID3. Since the ID1 receiving device 100 has already been specified in order, the ID3 receiving device 100 is specified in step S315.

Next, the CPU 13-2 sets the second closest receiving device whose order is undecided to the n + 1th position (step S320). In the example shown in the left column of FIGS. 2A and 5, when n = 2, the receiving device 100 of ID3 is set to the third position. After that, the CPU 13-2 executes the processes after step S325. In the example shown in the left column of FIGS. 2A and 5, when n = 2, it is determined that there is a receiving device whose sequence is undecided because the receiving device of ID4 exists in step S325, and the variable n becomes 3. The processing after step S305 is executed.

In this case, in step S305, the third closest receiving device 100 is determined to be the second receiving device, and in steps S315 and S320, the receiving device 100 of ID4 is set to the fourth. After that, in step S325, it is determined that there is no receiving device whose sequence is undecided, and the sequence determination process ends.

It should be noted that a case where the order sequence determination process is executed when the cells are rearranged as shown in the example shown in the right column of FIGS. 2B and 5 will also be described. In this case, the information recorded in the memory 14 is the information shown in FIG. 7C. Immediately after the start of the order determination process, the order of ID2 to ID4 is undecided. When the sequence determination process is executed in this situation, step S310 is executed through steps S300 and S305, and the ID4 receiving device 100d closest to the ID1 receiving device 100a, which is the first, becomes the second.

Next, when step S305 and subsequent steps are executed with the variable n = 2, the second receiving device with an undetermined order, that is, the receiving device 100b with ID2, which is the second closest to the receiving device 100d with ID4, is set as the third. To. After that, when steps S305 and subsequent steps are executed with the variable n = 3, the third receiver with an undecided order, that is, the ID3 receiver 100c, which is the second closest to the ID2 receiver 100b, is set as the fourth. To.

(3-4) Display distance calculation process:
Next, the display distance calculation process in step S215 will be described. FIG. 8 is a flowchart of the display distance calculation process for calculating the display distance of each receiving device. In the display distance calculation process, the CPU 13-2 sets the variable n indicating the order sequence to 1 and the variable L indicating the display distance to 0 (step S400). Next, the CPU 13-2 sets the display distance of the nth receiving device 100 to L (step S405). That is, the CPU 13-2 sets the display distance of the first receiving device 100 to 0 (m).

Next, the CPU 13-2 acquires the inter-device distance La between the n-th and n + 1-th receiving devices 100 (step S410). Next, the CPU 13-2 assigns L + La to the variable L (step S415), and acquires L as the display distance of the n + 1th receiving device (step S420). For example, in the example shown in the left column of FIGS. 2A and 5, when n = 1, the inter-device distance La1 between the first receiving device 100a and the second receiving device 100b is acquired in step S410. .. In step S415, L + La1 (= 0 + La1) is assigned to the variable L, and in step S420, the display distance of the second receiving device 100b becomes La1.

Next, the CPU 13-2 determines whether or not n is N-1, that is, whether or not the distance between the devices to the Nth receiving device 100 is accumulated (step S425). If it is not determined that n is N-1, the CPU 13-2 increments the variable n (step S430) and repeats the processes after step S410.

For example, when step S410 is executed with n = 2 in the example shown in the left column of FIGS. 2A and 5, in step S410, between the second receiving device 100b and the third receiving device 100c. The distance La2 between the devices is acquired. Then, in step S415, the inter-device distance is accumulated and the variable L is updated to become La1 + La2, and in step S420, the display distance of the third receiving device becomes La1 + La2.

The above processing is a process of accumulating the distance between the nth and n + 1th receivers in order from the smallest value of n until n becomes N-1. If this accumulation is executed until n becomes N-1, the display distance of the Nth receiving device is acquired. According to this process, the display distance, which is the distance from the receiving device arranged at the distance starting point to the receiving device arranged at the distance display point, can be acquired as the distance along the road.

(4) Second embodiment:
The above-mentioned distance display system is an embodiment, and the distance display system can be realized by different configurations. For example, the receiving device 100 and the distance display control device 200 may be separate devices. FIG. 9A shows an example of a configuration in which the receiving devices 101a to 101d are attached to the signboard 1a, but the distance display control device 201 is a device different from these receiving devices 101a to 101d. In this example, the distance display control device 201 is attached to the display device DD mounted on the work vehicle Ve.

The receiving devices 101a to 101d can be realized by the hardware shown in FIG. The distance display control device 201 can also be realized by the hardware shown in FIG. 3, but the display 20 may be omitted. In the receiving devices 101a to 101d, the same function as that of the receiving device 100 shown in FIG. 4 is executed by executing the receiving device control program 110 similar to that of the first embodiment.

However, in the case of the present embodiment, since the receiving device 101a, which is not the distance display control device 201, is the distance starting point, the device arranged at the distance starting point is specified among the receiving devices 101a to 101d. The device arranged at the distance starting point may be specified by various methods such as a GNSS signal and a user's instruction. The configuration specified by the user's instruction is realized, for example, by defining information indicating whether or not it is a distance starting point by the switch 15c.

The user operates the switches 15c of the receiving devices 101a to 101d to instruct whether the receiving devices 101a to 101d are arranged at the distance starting point or the distance display point. In the receiving device that has been set to be placed at the distance starting point, the flag indicating that it is the distance starting point is turned on and stored in the memory 14. In the receiving device that is not set to be placed at the distance starting point, the flag indicating that it is the distance starting point is turned off and stored in the memory 14. In the example shown in FIG. 9A, the flag indicating the distance starting point is set to on in the receiving device 101a, and the flag indicating the distance starting point is set to off in the receiving devices 101b to 101d.

Therefore, when the receiving devices 101a to 101d execute steps S100 to S125 by the receiving device control program 110, the CPU 13-1 has a flag indicating that the identification information is the position information and the distance starting point in the step S105. The on / off is associated and transmitted to the distance display control device 201.

On the other hand, in the distance display control device 201, the same function as the distance display control device 200 shown in FIG. 4 is executed by executing the same distance display control program 210 as in the first embodiment. However, in the distance display control device 201, the function as the receiving device 100 and the display 20-2 may be omitted.

The distance display control device 201 also executes the same process as the process shown in FIG. 6, but since the function as the receiving device 100 is unnecessary, step S200 may be omitted. Further, in step S205, the identification information, the position information, and the on / off of the flag indicating the distance starting point are acquired from each receiving device. FIG. 9B shows an example of information stored in the memory 14 of the distance display control device 201. FIG. 9B is information in which a flag indicating that the distance is calculated is added to the example shown in FIG. 7A. In this example, the IDs of the receiving devices 101a to 101d are 1 to 4, and all of them function as slaves. Further, since the function of calculating the distance between the receiving devices is not executed between the receiving devices, the information for distinguishing the master and the slave is all (0), and all the receiving devices are slaves.

When step S210 is executed based on this information in the distance display control device 201, the CPU 13-2 executes the order sequence determination process shown in FIG. 7B, but in step S300, it indicates that it is a distance starting point. The receiving device 101a with the flag turned on is considered to be the first. The processing after step S305 is the same as that of the first embodiment. Further, the processes after step S215 shown in FIG. 6 are the same as those in the first embodiment. According to the above configuration, the distance display control device 201, which is separate from the receiving devices 101a to 101d, can display the distance from the distance starting point on the display 20 of the receiving devices 101a to 101d.

(5) Third embodiment:
Further, there may be a plurality of sequences for accumulating the distances between devices. For example, a plurality of distance starting points may be set for the same construction site. FIG. 1B is an example of a signboard 1b that can be used around the same construction site as FIG. 1A, but has a different distance starting point. FIG. 10A is a diagram showing an example in which the signboard 1b is used. Construction is being carried out on the road RD shown in FIG. 10A, and a simple wall W is installed at the construction site.

The construction is a construction on an area on the road surrounded by the wall W and a site outside the road RD connected to the area, and a large vehicle enters and exits the construction site from the entrance P2 of the wall W. Further, in front of the wall W (rear in the traveling direction), lane regulation is started from the position P1. At such a construction site, the construction site is in front of the position P1 where the lane regulation is started, and the distance to the position P1 may be displayed by a signboard. Further, since a large vehicle enters and exits the entrance P2 of the wall W, the distance to the entrance P2 may also be displayed by a signboard.

In such a case, a different signboard, that is, a signboard 1a showing the distance from the position P1 and a signboard 1b showing the distance from the position P2 are used together. That is, a plurality of the plurality of signboards 1a are arranged rearward in the traveling direction on the road RD with the position P1 as the distance starting point. On the other hand, a plurality of the plurality of signboards 1b are arranged rearward in the traveling direction on the road RD with the position P2 as the distance starting point.

Therefore, the display distance may be displayed on the signboard in each of the different order rows of the receiving devices arranged with the plurality of distance starting points at the head. There are various methods for realizing such a display, and for example, a configuration in which a plurality of receiving devices are classified into a plurality of groups can be mentioned. For example, the receiving devices 102a to 102c attached to the signboard 1a shown in FIG. 10A and the receiving devices 103a to 103c attached to the signboard 1b are classified into different groups. Therefore, in the present embodiment, there are a distance starting point and a distance display point for each group. In FIG. 10A, the receiving device 102a is arranged at the distance starting point of one group, and the receiving devices 102b and 102c are arranged at the distance display point of the group. Further, the receiving device 103a is arranged at the distance starting point of the other group, and the receiving devices 103b and 103c are arranged at the distance display point of the group.

The receiving devices 102a to 102c and 103a to 103c can be realized by the hardware shown in FIG. The distance display control device can also be realized by the hardware shown in FIG. The distance display control device may be integrated with the receiving device or may be a separate body. In FIG. 10A, an example is assumed in which the receiving device 102a is integrated with the distance display control device 202 and functions as a master.

In the receiving devices 102b, 102c, 103a to 103c, the same function as that of the receiving device 100 shown in FIG. 4 is executed by executing the receiving device control program 110 similar to that of the first embodiment. However, in the case of the present embodiment, since there are a plurality of receiving devices that serve as distance starting points, the receiving devices arranged at the distance starting points and the group to which each receiving device belongs are specified. The device arranged at the distance starting point may be specified by various methods such as a GNSS signal and a user's instruction. The configuration specified by the user's instruction is realized, for example, by being instructed by the switch 15c whether or not it is a distance starting point.

Classification into groups may be carried out by various methods. For example, a plurality of receiving devices classified into a plurality of groups may be prepared in advance, or a plurality of receiving devices may be classified according to a user's instruction. The configuration classified by the user's instruction is realized by, for example, a configuration in which the group to which the receiving device belongs is designated by the switch 15c.

Here, an example will be described in which the user specifies whether or not the user exists at the distance starting point by the switch 15c, and specifies the group. That is, in the example shown in FIG. 10A, the user operates the switch 15c of each of the receiving devices 102a to 102c, sets the flag indicating that the receiving device 102a is a distance starting point to ON, and sets the receiving device 102a to ON. Associate information indicating that the group is the starting point of the distance. In the receiving devices 102b and 102c, the flag indicating that the distance starting point is set to off is set, and the information indicating that the group indicates that the receiving device 102a is the distance starting point is associated with the receiving devices 102b and 102c.

Further, the user operates the switch 15c of each of the receiving devices 103a to 103c, sets the flag indicating that the receiving device 103a is a distance starting point to ON, and sets the receiving device 103a as the distance starting point. Associate the information indicating that. In the receiving devices 103b and 103c, the flag indicating the distance starting point is set to off, and the information indicating that the group is in the receiving device 103a as the distance starting point is associated.

In the receiving device 102a, the receiving device 102a is set to behave as a master by operating the switch 15a. In other receiving devices, it is set to behave as a slave by operating the switch 15a. The information reflecting the above settings is stored in the memory 14 of each receiving device.

When the receiving devices 102b, 102c, 103a to 103c execute steps S100 to S125 by the receiving device control program 110, the CPU 13-1 in step S105 indicates that the identification information includes the position information and the distance starting point. The information indicating on / off and the group is associated and transmitted to the distance display control device 202.

On the other hand, in the distance display control device 202, the distance display control program 210 similar to that of the first embodiment is executed, so that the distance display control device 202 functions as the receiving device 102a and the distance display control device 202. That is, the same function as that of the distance display control device 200 shown in FIG. 4 is executed. The distance display control device 202 also executes the same processing as that shown in FIG. 6, but in step S205, on / off of the identification information, the position information, and the flag indicating the distance starting point from each receiving device. , Get information indicating the group.

FIG. 10B shows an example of information stored in the memory 14 of the distance display control device 202. FIG. 10B is information to which the flag indicating the distance starting point and the information indicating the group are added to the example shown in FIG. 7A. FIG. 11 is a diagram schematically showing the arrangement of the receiving devices 102a to 102c and 103a to 103c. In FIG. 11, x indicates that the receiver is located at the distance starting point. In the examples shown in FIGS. 10A, 10B, and 11, the receiving devices 102a to 102c having IDs 1 to 3 belong to group 1, and the receiving devices 103a to 103c having IDs 4 to 6 belong to group a. The symbol indicating the group is arbitrary, and may be either a numerical value or a character, or may be another symbol or the like.

In the distance display control device 202, when step S210 is executed based on the information shown in FIG. 10B, the CPU 13-2 executes the sequence determination process shown in FIG. 7B, and this process is executed for each group. .. In the example shown in FIGS. 10A, 10B, and 11, steps S300 to S330 are executed for the receiving devices 102a to 102c belonging to the group 1. Further, steps S300 to S330 are executed for the receiving devices 103a to 103c belonging to the group a. Again, in step S300, the CPU 13-2 considers that the receiving device in which the flag indicating the distance starting point is turned on is the first. The processing after step S305 is the same as that of the first embodiment.

When step S215 is executed, the CPU 13-2 executes the display distance calculation process shown in FIG. 8, and this process is also executed for each group. That is, the CPU 13-2 acquires the distance between the receiving device arranged at the distance starting point for each group and the receiving device arranged at the distance display point for each group as the display distance for each group.

In the example shown in FIGS. 10A, 10B, and 11, steps S400 to S430 are executed for the receiving devices 102a to 102c belonging to the group 1. Further, steps S400 to S430 are executed for the receiving devices 103a to 103c belonging to the group a. Again, in step S400, the CPU 13-2 considers that the receiving device in which the flag indicating the distance starting point is turned on is the first in each group. As a result of the above processing, the display distance is as follows.
Receiver 102b: La21
Receiver 102c: La21 + La22
Receiver 103b: La31
Receiver 103c: La31 + La32

The processing after step S220 shown in FIG. 6 is the same as that of the first embodiment. Here, an example of two groups has been described, but of course, the number of groups may be three or more. According to the above configuration, the distance from the distance starting point can be displayed on the receiving device according to a plurality of sequences arranged from the plurality of distance starting points.

(6) Fourth embodiment:
Further, a configuration in which a plurality of sequences for accumulating the distances between devices may be realized by a plurality of distance display control devices may be realized. For example, on a road where there are lanes that can travel in opposite directions, the display distance is for a vehicle that travels in one lane and in the other. There are cases where you want to convey.

FIG. 12 shows an example of a road having lanes that can travel in each of the directions opposite to each other. In the example shown in FIG. 12, there is a road RD around the mountain MT, the road RD has one lane on each side, and vehicles can travel in opposite directions in each lane. On the road RD, there is a construction site WS surrounded by a traffic cone (registered trademark). Signboards 1a1 and 1a2 are arranged in each lane in order to inform the vehicle traveling in each lane of the distance to the construction site WS.

In this embodiment, signboards (receivers) belonging to different sequences are distinguished as different systems. In the example shown in FIG. 12, the signboard 1a1 arranged along the lane where the construction site WS exists is distinguished as the first system, and the signboard 1a2 arranged along the lane traveling in the opposite direction is distinguished as the second system. do. The receiving devices 104a to 104d belong to the first system, and the receiving devices 105a to 105c belong to the second system.

In the present embodiment, a distance display control device and 204 for controlling the distance display related to the first system and a distance display control device 205 for controlling the distance display related to the second system are used. The distance display control device 204 acquires position information from the receiving devices 104a to 104d belonging to the first system, acquires the display distance, and displays the display on the displays of the receiving devices 104a to 104d belonging to the first system. Further, the distance display control device 205 acquires position information from the receiving devices 105a to 105c belonging to the second system, acquires the display distance, and displays the display on the displays of the receiving devices 105a to 105c belonging to the second system.

The distance display control device may be integrated with the receiving device or may be a separate body. In the example shown in FIG. 12, the distance display control device and the receiving device are integrated. The receiving devices 104a to 104d and 105a to 105c and the distance display control devices 204 and 205 can be realized by the hardware shown in FIG.

In the receiving devices 104b to 104d, 105b, 105c, by executing the receiving device control program 110 similar to that of the first embodiment, the same functions as those of the receiving device 100 shown in FIG. 4 are executed. However, in the case of the present embodiment, there are a plurality of receiving devices that also function as a distance display control device and serve as a distance starting point. Therefore, the user operates the switch 15a to set a plurality of receiving devices as masters. In the example shown in FIG. 12, the receiving devices 104a and 105a are set to the master (M), and the other receiving devices are set to the slave (S).

In this example, the receiving devices 104a and 105a set as the master are arranged at the distance starting point, and the other receiving devices are arranged at the distance display point. Therefore, in the receiving devices 104a and 105a, the flag indicating that the distance is calculated is set to ON by the switch 15c. In other receiving devices, the switch 15c sets the flag indicating the distance starting point to off.

Further, the user operates the switch 15c to specify the system to which each receiving device belongs. In the example shown in FIG. 12, the receiving devices 104a to 104d are set to the first system, and the receiving devices 105a to 105c are set to the second system. The setting of this information may be carried out in various embodiments as in the above-described embodiment.

When the receiving devices 104b to 104d, 105b, 105c execute steps S100 to S125 by the receiving device control program 110, the CPU 13-1 in step S105 includes position information, information indicating a master or slave, and distance calculation in the identification information. On / off of the flag indicating that it is a point, and information indicating the system are transmitted in association with each other. This information is received by both the distance display control devices 204 and 205 and stored in the memory 14.

On the other hand, in the distance display control device 204.205, the distance display control program 210 similar to that of the first embodiment is executed, so that the distance display control device 204.205 functions as a receiving device and a distance display control device. That is, the same function as that of the distance display control device 200 shown in FIG. 4 is executed. In the distance display control devices 204 and 205, the same processes as those shown in FIG. 6 are independently executed, but in step S205, the identification information, the position information, the information indicating the master or the slave, and the distance are executed from each receiving device. The flag indicating that it is the starting point is turned on / off, and the information indicating the system is acquired.

FIG. 13A shows an example of information stored in the memory 14 of the distance display control devices 204 and 205. FIG. 13A is information to which the flag indicating the distance starting point and the information indicating the system are added to the example shown in FIG. 7A. FIG. 13B is a diagram schematically showing the arrangement of the receiving devices 104a to 104d and 105a to 105c. In FIG. 13B, x indicates that the receiver is located at the distance starting point. In the examples shown in FIGS. 12, 13A and 13B, the receiving devices 104a to 104d having IDs 1 to 4 belong to the first system, and the receiving devices 105a to 105c having IDs 5 to 7 belong to the second system.

When step S210 is executed based on the information shown in FIG. 13A in the distance display control devices 204 and 205, the CPU 13-2 executes the sequence determination process shown in FIG. 7B, but this process is executed for each system. Will be done. In the example shown in FIGS. 12, 13A, and 13B, the CPU 13-2 of the distance display control device 204 refers to the memory 14, and is the first system to which the receiving device 104a integrated with the distance display control device 204 belongs. The receiving devices 104b to 104d belonging to the system of the above are specified. Then, the CPU 13-2 targets the receiving devices 104a to 104d belonging to the first system, and executes steps S300 to S330.

Further, the CPU 13-2 of the distance display control device 205 refers to the memory 14 and identifies the receiving devices 105b and 105c belonging to the second system to which the receiving device 105a integrated with the distance display control device 205 belongs. Then, the CPU 13-2 targets the receiving devices 105a to 105c belonging to the second system, and executes steps S300 to S330.

When step S215 is executed, the CPU 13-2 executes the display distance calculation process shown in FIG. 8, and this process is also executed for each system. That is, the CPU 13-2 of the distance display control device 204 has the receiving devices 104a arranged at the distance starting point in the first system and the receiving devices 104b to 104d arranged at the distance display point in the first system. Get the distance as the display distance. The CPU 13-2 of the distance display control device 205 determines the distance between the receiving devices 105a arranged at the distance starting point in the second system and the receiving devices 105b and 105c arranged at the distance display point in the second system. Get as the display distance.

As a result of the above processing, the display distance is as follows.
Receiver 104b: La41
Receiver 104c: La41 + La42
Receiver 104d: La41 + La42 + La43
Receiver 105b: La51
Receiver 105c: La51 + La52

The processing after step S220 shown in FIG. 6 is the same as that of the first embodiment. The road shown in FIG. 12 is curved and has a slope, but the display distance of the present embodiment is obtained by accumulating the distances between the receiving devices, so that the distance along the road can be determined. It becomes the display distance. Therefore, even on a curved road or a sloped road, the display distance can be accurately specified as compared with the configuration in which the display distance is a straight line distance.

Further, although an example of two lines has been described here, of course, the number of lines may be three or more. According to the above configuration, the distance from the distance starting point can be displayed on the receiving device according to a plurality of sequences arranged from the plurality of distance starting points. In this example, the strains are distinguished by the information indicating the strain, but they may be distinguished by other embodiments. For example, if the frequency of the carrier wave used in the wireless communication module 12 is set to be different for each system, the system can be distinguished without transmitting information indicating the system.

(7) Other embodiments:
The above embodiment is an example for carrying out the present invention, and various other embodiments are made as long as the distance between the receiving devices is acquired based on the position information acquired by the receiving device and displayed on the display. The form can be adopted. For example, the display content, size, shape, etc. of the signboard are not limited, and the display target is not limited to the signboard. Further, the receiving device and the distance display control device may have at least a part of their functions distributed to a plurality of devices, or may cooperate with other devices.

Further, in the above-described embodiment, the receiving device 100 and the distance display control device 200 are realized by the same hardware configuration, but may be realized by different devices. Further, the distance display control device 200 does not have to include the display 20. Further, the receiving device 100 arranged at the distance starting point does not have to be provided with the display 20. Further, the distance acquired by the distance display control device 200 may be used for a purpose other than the display. For example, a configuration is adopted in which a distance is specified in the moving process of the receiving device 100, and a notification is given when the error between the distance and a predetermined value (for example, a value in which the last two digits become 0) becomes equal to or less than a threshold value. You may. According to this configuration, the receiving device 100 can be easily arranged at a position where the distance is a predetermined value.

The position information acquisition unit may be able to acquire the position information of the receiving device from a plurality of receiving devices that receive the GNSS signal. That is, it is sufficient that the position information acquisition unit can acquire the position information of each of the plurality of receiving devices as the information of the calculation source of the display distance. The position information may be any information for specifying the position (coordinates) of the receiving device, may be the GNSS signal itself acquired from the navigation satellite, or may be acquired by processing the GNSS signal. It may be information.

Based on the position information, the display distance acquisition unit may acquire the distance between the receiving device arranged at the distance starting point and the receiving device provided with the display and arranged at the distance display point as the display distance. I hope I can. That is, the display distance acquisition unit may be able to acquire the display distance based on the position information of the receiving device. The display distance may be any distance from the receiving device arranged at the distance display point to the receiving device provided with the display. Therefore, the display distance may be the linear distance between the two receiving devices or the distance along the road between the two receiving devices. Various configurations are possible for acquiring the distance along the road. For example, as in the above-described embodiment, the distance may be acquired by accumulating the distances between the devices, or the distance along the road may be calculated and acquired based on the shape of the road or the like.

The distance starting point may be any position as long as it is a starting point when measuring the display distance, and is, for example, one point at the construction site. Therefore, the distance starting point may be variable according to the progress of construction and the like. The display may be a device for displaying the display distance, may be integrated with the receiving device, or may have a separate configuration connected to the receiving device by a signal line or the like.

The display control unit may transmit the display distance to the receiving device arranged at the distance display point and display it on the display. That is, the distance display control device causes the receiving device to display the display distance by transmitting the display distance to be displayed on the display of the receiving device. The display control and the like may be performed mainly by the receiving device, but the distance display control device may at least be able to transmit the display distance to the receiving device in order to display on the display. Of course, the display distance may be displayed on the display by a control signal from the distance display control device.

The method of generating the sequence of receiving devices is not limited to the method of generating by sequentially selecting the closest receiving devices as in the above-described embodiment. For example, a configuration in which one line connecting the positions of the receiving devices is specified based on the position of the receiving device and the receiving devices are considered to be lined up on the line may be adopted.

The setting by the switches 15a and 15b may be carried out at the initial stage before the start of operation, or may be carried out after the start of operation. For example, the receiving device arranged at the distance starting point may be changed by operating the switch 15c. More specifically, when rearranging from the arrangement shown in FIG. 2A to the arrangement shown in FIG. 2B, the positions of the receiving devices 100a, 100b, and 100c are not changed, and the receiving device 100d is moved in front of the receiving device 100a. Is also good. In this case, the switch 15c of the receiving device 100a is operated, and the flag indicating the distance starting point is turned off. Further, the switch 15c of the receiving device 100d is operated, and the flag indicating that the distance is calculated is turned on. The master may be the receiving device 100a or may be changed to the receiving device 100d. Of course, other devices may be used.

Further, the scene in which the distance display system is used is not limited to one road as described above. For example, the road may include an intersection, or the receiving devices may be arranged in a large site such as a parking lot instead of the road. Furthermore, the scene to which each of the above-described embodiments is applied is not limited to the above-mentioned example. For example, in the scene shown in FIG. 10A, the two receiving devices shown in the fourth embodiment may be used. Further, for example, in the scene shown in FIG. 12, the receiving devices of the two groups shown in the third embodiment may be used.

Further, the method of acquiring the distance between the receiving devices based on the position information acquired by the receiving device and displaying it on the display as in the present invention is also applicable as a program or a method. In addition, some of them are software and some of them are hardware, so they can be changed as appropriate. Further, the invention is also established as a recording medium for a program for controlling an apparatus. Of course, the recording medium of the software may be a magnetic recording medium or a semiconductor memory, and any recording medium developed in the future can be considered in exactly the same way.

1a ... signboard, 1b ... signboard, 11 ... GNSS module, 12 ... wireless communication module, 13 ... CPU, 14 ... memory, 15a-15c ... switch, 20 ... display, 20a ... display panel, 20b ... panel control unit, 100 ... Receiver, 110 ... Receiver control program, 110a ... Receiver, 110b ... Position information transmitter, 110c ... Display distance receiver, 200 ... Distance display control device, 210 ... Distance display control program, 210a ... Position information acquisition unit, 210b ... Display distance acquisition unit, 210c ... Display control unit

Claims (10)

A position information acquisition unit that acquires position information of the receiving device from a plurality of receiving devices that receive GNSS signals, and a position information acquisition unit.
A display distance acquisition unit that acquires the distance between the receiving device arranged at the distance starting point and the receiving device provided with the display and arranged at the distance display point based on the position information. ,
A display control unit that transmits the display distance to the receiving device arranged at the distance display point and displays it on the display.
A distance display control device. The display distance acquisition unit is
The receiving device arranged at the distance starting point is regarded as the first arranged receiving device, and the distance between the nth and n + 1th receiving devices is accumulated until n becomes N-1. Thereby, the display distance of the receiving devices arranged in the Nth order is acquired (N is an integer of 2 or more and less than or equal to the number of the receiving devices, n is an integer of 1 or more and N-1 or less).
The distance display control device according to claim 1. The display distance acquisition unit is
Based on the position information, the process of setting the receiving device closest to the nth receiving device (n is an integer of 1 or more and N-1 or less) as the n + 1th receiving device is performed in order from the smallest n-1. By repeating up to the th, the order of N said receivers is set.
The distance display control device according to claim 2. The display distance acquisition unit is
The display distance is acquired according to the elapse of a predetermined period or an instruction by the user.
The display control unit
When the display distance is newly acquired, the acquired display distance is transmitted to the receiving device and displayed on the display.
The distance display control device according to any one of claims 1 to 3. The display distance acquisition unit is
The plurality of receivers are classified into a plurality of groups, and the plurality of receivers are classified into a plurality of groups.
The distance between the receiving device arranged at the distance starting point for each group and the receiving device arranged at the distance display point for each group is acquired as the display distance for each group.
The distance display control device according to any one of claims 1 to 4. Any of claims 1 to 4, wherein the position information is acquired from the receiving device belonging to the first system, the display distance is acquired, and the display is displayed on the display of the receiving device belonging to the first system. The distance display control device described in item 1 and
Any of claims 1 to 4, wherein the position information is acquired from the receiving device belonging to the second system, the display distance is acquired, and the display is displayed on the display of the receiving device belonging to the second system. The distance display control device described in item 1 and
A distance display system that includes. A receiver that receives GNSS signals and
A position information transmitting unit that transmits the position information indicated by the GNSS signal to the distance display control device, and
A display distance receiving unit that receives a display distance, which is a distance from a distance starting point, acquired by the distance display control device based on the position information.
A display that displays the display distance and
A receiver equipped with. A receiver that receives GNSS signals and
A position information transmitting unit that transmits the position information indicated by the GNSS signal to the distance display control device, and
A display distance receiving unit that receives a display distance, which is a distance from a distance starting point, acquired by the distance display control device based on the position information.
A display that displays the display distance and
With multiple receivers and
A position information acquisition unit that acquires the position information of each of the plurality of receiving devices, and
A display distance acquisition unit that acquires the distance between the receiving device arranged at the distance starting point and the receiving device arranged at the distance display point as the display distance based on the position information.
A display control unit that transmits the display distance to the receiving device arranged at the distance display point and displays it on the display.
Distance display system including. A position information acquisition step of acquiring the position information of the receiving device from a plurality of receiving devices that receive the GNSS signal, and a position information acquisition process.
A display distance acquisition step of acquiring the distance between the receiving device arranged at the distance starting point and the receiving device provided with the display and arranged at the distance display point based on the position information as a display distance. ,
A display control step of transmitting the display distance to the receiving device arranged at the distance display point and displaying the display on the display.
Distance display control method. Computer,
A position information acquisition unit that acquires position information of the receiving device from a plurality of receiving devices that receive GNSS signals.
A display distance acquisition unit that acquires the distance between the receiving device arranged at the distance starting point and the receiving device provided with the display and arranged at the distance display point based on the position information as a display distance.
A display control unit that transmits the display distance to the receiving device arranged at the distance display point and displays it on the display.
Distance display control program to function as.

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