JP2012098077A - Positional information service device, positional information service system and positional information service method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a positional information service device, a positional information service system and a positional information service method for supplying more accurate positional information even in a moving body.SOLUTION: A positional information service device supplies, to a receiver unit used in a moving body, information indicating a position of the receiver unit. The positional information service device comprises: reference position acquisition means configured to obtain a position of a reference point in the moving body; transmission means installed at a prescribed position in the moving body and configured to notify the receiver unit of own absolute coordinates thereof as positional information; and coordinate calculation means configured to calculate absolute coordinates of the transmission means, based on the position of the moving body at the reference point and relative coordinates of the transmission means from the reference point.

Description

  The present invention relates to a position information providing apparatus, a position information providing system, and a position information providing method for providing position information to a receiving apparatus.

  Conventionally, a position information providing apparatus that notifies a current position to a receiving apparatus held by a user is known. For example, in a GPS (Global Positioning System) system, coordinates of a receiving device are calculated using PGS waves transmitted from a satellite, and services such as navigation are provided using these coordinates.

  In addition, when the receiving device is located in a place where GPS waves cannot be received such as tunnels and underground, a broadcast receiver is installed at a position where the GPS waves can be received, and the GPS waves are transferred from the broadcast receiver to the receiving device. Are also disclosed (for example, see Patent Documents 1-3).

  Furthermore, there is also known a device in which a transmitter is installed indoors or in a vehicle and position information is provided to a receiving device based on information notified from the transmitter (see, for example, Patent Documents 4 and 5). . In such a position information providing apparatus, the installation position is registered as position information in each transmitter, and this position information is transmitted when the receiving apparatus approaches the transmitter.

JP 2003-57330 A JP 2002-236165 A JP-A-7-2800917 JP 2002-90442 A JP 2000-298034 A

  In the above-described conventional position information providing device, when a user having a receiving device is located in the moving body, it is difficult to provide the receiving device with accurate position information in the moving body. That is, the conventional position information providing apparatus can only provide a rough position in the moving body, and cannot provide accurate position information by the receiving apparatus.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a position information providing apparatus, a position information providing system, and a position information providing method that provide more accurate position information even in a moving body.

  In order to solve the above-described problem, in the present invention, in a position information providing apparatus that provides information indicating the position of the receiving apparatus to the receiving apparatus, a reference position acquiring unit that acquires the position of a reference point in the moving body; A transmitting means that is installed at a predetermined position in the moving body and notifies the receiving apparatus of the absolute coordinates of the own device as position information; a position of the moving body at a reference point; and a relative position from the reference point in the transmitting means Coordinate calculating means for calculating absolute coordinates of the transmitting means based on the specific coordinates.

  In the invention configured as described above, the reference position acquisition unit acquires the position of the reference point on the moving body. The reference point is an arbitrary place in the moving body, and any reference point can be used as long as the accurate position can be specified. The transmission means is installed at a predetermined position in the moving body, and notifies the receiving apparatus held by the user as the position information of the absolute coordinates of the own device. At this time, the position information transmitted from the transmitting means is calculated by the coordinate calculating means based on the position of the moving body at the reference point and the relative coordinates from the reference point in the transmitting means.

  Therefore, in the position information providing apparatus according to the present invention, it is possible to provide coordinates more accurate than conventional ones as position information to the receiving apparatus located in the moving body.

  The present invention can also be applied to a position information providing system that includes a position information providing apparatus as a part. Furthermore, the present invention is not limited to a product invention, and can be applied to a position information providing method to which the present invention is applied.

  As described above, according to the present invention, more accurate position information can be provided to the receiving apparatus even in the moving body.

It is an internal side view of the train for demonstrating the positional information provision system arrange | positioned at a train. FIG. 2 is a diagram for explaining the configuration of a management device 20 and a transmitter 30. It is a block diagram for demonstrating the structure of a receiver. It is an image figure explaining each table. It is an image figure explaining map data Md. It is a figure explaining the structure of position information PD. 4 is a flowchart for explaining processing executed by a management device 20, a transmitter 30, and a reception device 40. It is a block diagram for constructing a digital ATC system. It is a figure which shows the example of arrangement | positioning of a ground apparatus. It is an internal top view of the ship for demonstrating the positional information provision system 10 arrange | positioned in the ship. It is a block block diagram explaining the structure of the positional information provision system in the ship. It is a figure explaining the relationship between the advancing direction Lt of the ship 2, and the relative coordinate Cre.

Hereinafter, embodiments of the present invention will be described in the following order.
1. First embodiment:
2. Second embodiment:
3. Other embodiments:

1. First embodiment:
1.1. Configuration of location information providing system:
Hereinafter, a first embodiment in which a position information providing system according to the present invention is embodied will be described with reference to the drawings. FIG. 1 is an internal side view of a train for explaining a position information providing system arranged in the train. FIG. 2 is a diagram for explaining the configuration of the management device 20 and the transmitter (transmission means) 30. Further, FIG. 3 is a configuration diagram for explaining the configuration of the receiving apparatus.

  The position information providing system 10 according to the present embodiment provides the position information indicating the coordinates where the receiving device 40 is located to the receiving device 40 that is arranged in the train 1 and held by a user located in the train. . The position information providing system 10 includes a reference position acquisition unit 11, a management device 20, a transmitter 30 (30 a to 30 d) that constitute a position providing device, and a receiving device 40.

  The reference position acquisition unit (reference position acquisition means) 11 acquires a speed pulse of the train 1 such as a block number provided from the transponder ground element 7 arranged on the rail operated by the train 1, and the current train 1 The position on the track (rail) is transmitted to the management device 20. In the present embodiment, the reference position acquisition unit 11 and the transponder ground element 7 are part of an existing train control system, and a block number for identifying a block arranged on the rail is assigned from the transponder ground element 7 to the reference in the train 1. By transmitting to the position acquisition unit 11, the reference position acquisition unit 11 can detect the position on the track (rail) in consideration of the current speed of the train 1 and the like. Hereinafter, an example of a train control system will be described based on a digital ATC (Automatic Train Control) system. The reference position acquisition unit 11 is a well-known technique, but its outline will be described in “1.4. Acquisition of position by reference position acquisition unit 11:”.

  The management device 20 is realized by a computer system, for example, and manages each transmitter 30. The management device 20 executes various programs recorded on the HDD 22 or processes data under the integrated control of the main controller 21. Here, the main controller 21 includes a CPU and a RAM. In addition, the management device 20 receives an operation from the operation unit 26 via the IO I / F 25. The management apparatus 20 is connected to the transmitter 30 via the communication I / F 23 and transmits the position information PD to the transmitter 30. The management device 20 is connected to the reference position acquisition unit 11 via the communication I / F 24.

  In addition to various programs executed by the main controller 21, various data are recorded in the HDD 22. In particular, the HDD 22 stores a management table T1 for managing the relative position of each transmitter 30, and map data Md and a data table T2 for calculating the coordinates of the transmitter 30.

  FIG. 4 is an image diagram illustrating each table. Here, FIG. 4- (A) is an image diagram illustrating the management table T1. In the management table T1, relative coordinates Cre indicating the relative position from the position reference point Ps in each transmitter 30 managed by the management apparatus 20 are recorded. That is, in the management table T1, a transmitter ID that identifies each transmitter 30 and a relative coordinate Cre are associated and recorded. Here, the relative coordinate Cre is a position on the relative coordinate of the train 1 grasped by the management device 20, and this coordinate is defined with the position reference point Ps as the center. That is, the coordinates indicate how far each transmitter 30 is located from the position reference point Ps. The position reference point Ps is set based on the arrangement position of the reference position acquisition unit 11.

  FIG. 5 is an image diagram for explaining the map data Md. The map data Md records the position of the track (rail) that the train operates. Further, in this embodiment, the map data Md is recorded with the position of each block on the rail corresponding to the block number transmitted from the transponder ground element 7 together with its coordinates, and the management device 20 indicates the current position on the rail. Used to judge.

  FIG. 4- (B) is an image diagram for explaining the data table T2. The data table T2 records the coordinates between the ground elements 7 on the rail recorded in the map data Md, the block number, and the remaining distance in the block in association with each other. The coordinates between the ground elements 7 recorded in the data table are recorded at appropriate distance intervals along the rail, for example. Therefore, by using this data table T2, coordinates can be obtained from the block number and the remaining distance in the block.

  The main controller 21 also executes the program recorded in the HDD 22 to provide the absolute coordinate calculation unit 21a that calculates the absolute coordinates of each transmitter 30 and the calculated absolute coordinates to the transmitter 30 as position information. The function of the location information providing unit 21b is realized. Specific functions of the absolute coordinate calculation unit 21a and the position information providing unit 21b will be described later.

  The transmitter 30 is, for example, a device conforming to the IMES (Indoor Messaging System) standard, and is installed in each of the vehicles 1 a to 1 n in the train 1 and provides position information to the receiving device 40. The transmitter 30 is connected to the management device 20 through the communication I / F 34, receives the position information PD and the like created by the management device 20, and records them in the nonvolatile memory 33. The transmitter 30 can modulate the recorded position information PD and the like by the baseband signal processing unit 32 and then superimpose it on the carrier wave by the RF unit 31 and output it as a radio wave. In addition, since the effective area exists in the radio transmitted via the RF unit 31, only the receiving device 40 located in the effective area receives the transmitted position information PD. Each drive of the transmitter 30 described above is controlled by a controller 35 in an integrated manner.

  FIG. 6 is a diagram for explaining the configuration of the position information PD. In addition, since the positional information calculated by the management apparatus 20 always changes according to the movement of the train, the positional information at a certain time t will be described as positional information PDt. The position information PDt includes an absolute coordinate CAt of the transmitter 30 at a predetermined time t and a relative coordinate Cre within the train of the transmitter 30. As described above, the absolute coordinate CAt and the relative coordinate Cre constituting the position information PDt are created by the management device 20 and registered in the transmitter 30. By receiving the position information PDt transmitted from the transmitter 30, the receiving device 40 can recognize the absolute coordinate CAt at a certain time t of the own device and the relative coordinate Cre in the train.

  The receiving device 40 is realized by, for example, a mobile phone or a small portable terminal, and receives a GPS wave transmitted from a satellite or position information PDt transmitted from the transmitter 30, and specifies the position of the own device. Specifically, the receiving device 40 receives a GPS wave or a carrier wave transmitted from the transmitter 30 through the RF unit 41 and demodulates the position information from the GPS wave or the carrier wave by the baseband signal processing unit 42. To extract. The extracted position information is used by the controller 43 for various processes. The receiving device 40 includes a display module 45 for displaying a predetermined screen.

  The nonvolatile memory 44 stores various programs for causing the controller 43 to execute predetermined processing, and map data Md for specifying a position on the map in the receiving device 40 based on the received position information. Has been. The controller 43 implements the function of the data execution unit 43 a by executing various programs recorded in the nonvolatile memory 44. The map data Md recorded in the nonvolatile memory 44 is the same as the map data Md recorded in the management device 20. The controller 43 can provide services such as navigation by specifying the position of the own device using the map data Md by the function of the data execution unit 43a.

1.2. Location information provision processing:
Hereinafter, the position information providing process in the position information providing system 10 will be described. FIG. 7 is a flowchart for explaining processing executed by the management device 20, the transmitter 30, and the reception device 40.

In the management device 20, in step S1, the absolute coordinate calculation unit 21a acquires the position PLt on the rail and the traveling direction Lt of the train 1 transmitted from the reference position acquisition unit 11 (step S1: YES). The position PLt on the rail is based on the block number transmitted from the transponder ground element 7 arranged on the rail at a certain time t to the reference position acquisition unit 11 and the speed of the train 1. 11 is the calculated value.
The traveling direction Lt according to the first embodiment means the direction of the train 1 on the rail. Therefore, when the train performs a turning operation, the traveling direction is also reversed, and thus it is necessary to perform presetting in the management device 20. The acquisition of the traveling direction Lt is acquired by the reference position acquisition unit 11 in the digital ATC system. In addition, the reference position acquisition unit 11 determines the traveling direction Lt by changing the block number. It may be.

  In step S2, the absolute coordinate calculation unit 21a refers to the management table T1 and refers to the relative coordinates Cre in each transmitter 30. For example, when referring to the relative coordinate Cre in the transmitter 30a, the relative coordinate Cre associated with the transmitter ID indicating the transmitter 30a is referred to from the management table T1, thereby referring to the relative coordinate Cre of the transmitter 30a. .

  In step S3, the absolute coordinate calculation unit 21a refers to the data table T2 in the target transmitter 30 with reference to the map data Md based on the position PLt on the rail, the traveling direction Lt, and the relative coordinates Cre in the transmitter 30. Find the location (block number, remaining distance in block). For example, the absolute coordinate calculation unit 21a refers to a reference location at a position returned from the reference position Ps on the rail specified on the map data Md by the relative coordinate Cre in the direction opposite to the traveling direction of the train 1 along the rail direction. (Block number, remaining distance in block) is obtained as a reference location in the target transmitter 30.

  In step S4, the absolute coordinate calculation unit 21a uses the data table T2 to calculate the coordinate corresponding to the reference location obtained in step S3 as the absolute coordinate CAt in the target transmitter 30.

  The processes in steps S2 to S4 are repeated until the absolute coordinates CAt of all transmitters 30 arranged in the train 1 at a certain time t are calculated. Therefore, when the absolute coordinates CAt of all transmitters 30 are calculated at a certain time t (step S5: YES), in step S6, the position information transmitting unit 21b calculates the absolute coordinates CAt of each transmitter 30 and the calculated absolute coordinates CAt. The relative coordinates Cre recorded in the management table T1 are transmitted as position information PDt to the transmitter 30 through the communication IF 23. In addition, the coordinate calculation means of this invention is implement | achieved by the process of said step S1-4.

  When the transmitter 30 receives the position information PDt (step S11: YES), the transmitter 30 records the absolute coordinates CAt and the relative coordinates Cre included in the position information PDt in the nonvolatile memory 33 (step S12). In step S <b> 13, the transmitter 30 transmits the position information PDt to the transmittable area through the RF unit 31.

  When the receiving device 40 is located within the transmittable area of the transmitter 30, the receiving device 40 receives this position information PDt (step S21: YES).

  If the user is set to display both the absolute coordinates CAt and the relative coordinates Cre as the positioning process of the receiving device 40 (step S22: YES), in step S23, the data execution unit 43a displays the position information. Position information is displayed based on the absolute coordinates CAt and relative coordinates Cre included. For example, the absolute position on the map data Md is displayed using the display module 45, and the relative position in the train 1 is displayed as coordinates.

  On the other hand, when the user is set to display only the relative coordinates Cre as the positioning process of the receiving device 40 (step S22: NO), in step S24, the data execution unit 43a displays the relative coordinates Cre included in the position information. Display information originally. The position information providing process in the position information providing apparatus 10 has been described above.

  As described above, in the first embodiment, more accurate position information can be provided to the receiving device 30 located in the train 1. Further, by diverting an existing train control system, an apparatus for obtaining absolute coordinates can be used by diverting the existing system in order to realize the present invention.

1.4. Regarding acquisition of position by the reference position acquisition unit 11:
Hereinafter, a method in which the reference position acquisition unit 11 acquires the train position will be described. More detailed contents of the digital ATC shown below are described in Japanese Patent Application Publication No. 2002-330502. The configuration of the digital ATC shown below is an example, and the configuration of the digital ATC is not limited to the contents described below and the contents described in the above publications. In addition, what is described as digital ATC in the embodiments is the same basic technology as D-ATC (Didital ATC), DS-ATC (Digital communication & control for Shinkansen-ATC), ATC-NS (new ATC system) ), KS-ATC (Kyushu Shinkansen-ATC) and the like.

  FIG. 8 is a configuration diagram for constructing a digital ATC system. FIG. 9 is a diagram illustrating an arrangement example of ground devices. The rail side includes a ground device 6, a transponder ground element 7 and a block. The train 1 includes a reference position acquisition unit 11, a brake device 5, and a speed generator 4. Further, the reference position acquisition device 11 includes an ATC control unit 11a, a position register 11b, a transponder receiving unit 11c, a transponder vehicle upper part 11d, an ATC receiving unit 11e, and an ATC power receiver 11f. The management device 20 is not shown.

  A method of position recognition on the rail in the reference position acquisition unit 11 will be described. As shown in FIG. 9, the transponder ground element 7 is installed in places along the rail, and the block number (3T to 5T in FIG. 9) where the transponder ground element is installed and the end of the block from the transponder ground element. A distance L up to 7 is stored in the ground unit as data that can be read by the transponder vehicle upper unit 11d. When the transponder vehicle upper element 11d passes immediately above the transponder ground element 7, the information is read into the transponder vehicle upper element 11d. The reference position acquisition unit 11 on the vehicle is provided with a position register 11b for storing and updating the position of the own train. The position register 11b stores a block number and a remaining distance in the block. It has become. When the transponder vehicle upper element 11d passes immediately above the transponder ground element 7, the transponder vehicle upper element 11d reads the data (block number and distance L) of the transponder ground element 7. The transponder vehicle upper part 11d sends the read data to the ATC control unit 11a. When the ATC control unit 11a receives the block number and the information on the distance L, the block number in the position register 11b and the remaining distance in the block are Set with information from the transponder car upper 11d.

  The ATC control unit 11a can update the train position by taking in the speed pulse from the speed generator 4 and integrating the speed pulse. Therefore, after that, when the train advances, the ATC control unit 11a takes in the speed pulse from the speed generator, integrates the speed pulse, thereby subtracting the remaining distance in the block in the position register 11b, and the contents of the position register 11b. Will be updated. That is, the position PLt on the rail of the train is held and stored in real time as data stored in the block number of the position register 11b and the remaining distance in the block. As the train further progresses, the remaining distance of the position register 11b eventually becomes 0, that is, the train reaches the end of the block.

  In the memory of the ATC control unit 11a on the vehicle, information that can specify the arrangement of block numbers, that is, block connection information is stored. Specifically, connection information, which is information indicating how the block numbers are arranged on the actual line, is stored in the memory. When the remaining distance in the block of the position register 11b becomes zero, the ATC control unit 11a searches the block number next to the block number of the current position register 11b from the information regarding the arrangement of the block numbers stored in the memory 45. To do. The memory also stores information on the length of each block, that is, block length information, and the ATC control unit 11a retrieves the block length of the new block number retrieved earlier from this information, and the new block The number and the length of the block are set as new information in the position register 11b.

  In this way, in the on-track position detection unit 11, the value of the register 11 b (that is, the position PLt on the rail) is always calculated and updated according to the progress of the train 1. If the transponder ground element 7 is newly passed while traveling in this state, the position register 11b is rewritten with the information obtained from the transponder ground element.

  As described above, the position of the train 1 is always in the reference position acquisition unit 11 in the form of the running block number and the distance to the end of the rail section indicated by the block number (the remaining distance in the block). Is retained. Therefore, in the present embodiment, the management device 20 can detect the current position and traveling direction of the train 1 based on the position PLt on the rail of the train 1 provided from the reference position acquisition unit 11. Become.

2. Second embodiment:
Moreover, the mobile body in which the position information providing system 10 is arranged is not limited to a train. For example, the position information providing system 10 may be arranged in a ship. FIG. 10 is an internal top view of the ship for explaining the position information providing system 10 arranged in the ship 2. FIG. 11 is a block diagram illustrating the configuration of the position information providing system in the ship 2.

  The ship 2 includes a reference position acquisition unit 11 and a management device 20. In addition, the ship 2 includes a direction detection unit (direction detection unit) 27 such as a gyro sensor, and the traveling direction of the ship is detected as the traveling direction Lt by the direction detection unit 27 and transmitted to the management device 20. In the second embodiment, the reference position acquisition unit 11 acquires the absolute coordinates of the position reference point Ps from the GPS wave transmitted from the satellite, and transmits the absolute coordinates to the management device 20.

  Further, the ship 2 shown in FIG. 10 has a multi-layer structure, and each transmitter 30 is arranged in each layer of the ship 2. In the ship 2 shown in FIG. 10, the reference position acquisition unit 11 is arranged at a position in front of the ship of “Deck 4”, and the position of each transmitter 30 is the position where the reference position acquisition unit 11 is arranged. The relative coordinates Cre are registered in the management table T1 as the reference position Ps.

FIG. 12 is a diagram for explaining the relationship between the traveling direction Lt of the ship 2 and the relative coordinates Cre. The traveling direction Lt detected by the direction detecting unit 27 is shown as an inclination angle θ of the traveling direction with respect to the direction determined as a reference. Here, for the convenience of coordinate calculation, the direction defined as the reference is preferably determined by the axial direction of either longitude or latitude (that is, true east, true west, true south, true north). Since the ship 2 constantly changes its traveling direction, it is necessary to correct the relative coordinates Cre of each transmitter 20 using the tilt angle θ. For example, when the reference traveling direction is set to θ = 0 (true west in the figure) in absolute coordinates, and the traveling direction of the ship 2 is inclined by θ with respect to the reference traveling direction, the reference point Ps of each transmitter 30 is centered. It is necessary to use the value (R ′ (x ′, y ′)) corrected by the following equation (1) as the relative coordinates Cre (R (x, y)). Hereinafter, the corrected relative coordinates are described with “′”.

  Then, the absolute coordinate calculation unit 21a of the management device 2 uses the absolute coordinates of each transmitter 30 as position information PDt from the corrected relative coordinates Cre ′ and the absolute coordinates of the reference position Ps acquired based on the GPS wave. calculate. That is, the absolute coordinate calculation unit 21a calculates the absolute coordinate CAt in each transmitter 30 by adding the corrected relative coordinate Cre ′ to the absolute coordinate of the reference position Ps.

Hereinafter, similarly, the management apparatus 20 transmits the calculated position information PDt to the transmitter 30. The receiving device 40 can obtain accurate position information of the own device from the position information PDt transmitted from the transmitter 30. In addition, in the transmitter 30 conforming to the IMES standard, in addition to the absolute coordinates CAt and the relative coordinates Cre, information indicating the floor number of the ship 2 in which the transmitter 30 is arranged can be registered in the position information PDt.

  As described above, in the second embodiment, position information can be provided to the receiving device 30 used in the ship 2. Further, since the position information PDt can register information indicating the number of floors in the ship 2 and transmit this information, the user can know his / her exact position even in a multi-layered ship. .

3. Other embodiments:
There are various embodiments of the present invention.
An example of the moving body is not limited to a train or a ship.
Further, the method by which the reference position acquisition unit acquires the absolute coordinates of the position reference point Ps is not limited to the digital ATC or the GPS system, and other methods may be used.

Needless to say, the present invention is not limited to the above embodiments. It goes without saying for those skilled in the art,
・ Applying mutually interchangeable members and configurations disclosed in the above embodiments by appropriately changing the combination thereof.− Although not disclosed in the above embodiments, it is a publicly known technique and the above embodiments. The members and configurations that can be mutually replaced with the members and configurations disclosed in the above are appropriately replaced, and the combination is changed and applied. It is an embodiment of the present invention that a person skilled in the art can appropriately replace the members and configurations that can be assumed as substitutes for the members and configurations disclosed in the above-described embodiments, and change the combinations and apply them. It is disclosed as.

DESCRIPTION OF SYMBOLS 1 ... Train, 7 ... Transponder ground element, 10 ... Position information provision system, 11 ... Reference | standard position acquisition part, 20 ... Management apparatus, 21 ... Main controller, 21a ... Absolute coordinate calculation part, 21b ... Position information provision part, 22 ... HDD, 23, 24 ... Communication I / F, 25 ... IOI / F, 26 ... Operation unit, 27 ... Direction detection unit, 30 ... Transmitter, 31 ... RF unit, 32 ... Baseband signal processing unit, 33 ... Non-volatile Memory, 34 ... Communication I / F, 35 ... Controller, 40 ... Receiver, 41 ... RF unit, 42 ... Baseband signal processing unit, 43 ... Controller, 43a ... Data execution unit, 44 ... Non-volatile memory, 45 ... Display module

Claims (7)

In the position information providing device that provides information indicating the position of the receiving device to the receiving device,
Reference position acquisition means for acquiring the position of a reference point on the moving body;
A transmission unit installed at a predetermined position in the moving body and notifying the receiving apparatus as absolute coordinates of the own device;
Coordinate calculation means for calculating absolute coordinates of the transmission means based on the position of the mobile body at the reference point and the relative coordinates from the reference point in the transmission means. Location information providing device. The moving body is a train,
The position information providing apparatus according to claim 1, wherein the position of the moving body at a reference point is acquired through a train control system that can acquire position information on a route.   The position information providing apparatus according to claim 2, wherein the train control system is a digital ATC.   The position information providing apparatus according to claim 1, wherein the position of the moving body at a reference point is acquired via a GPS system. The moving body is a ship,
Direction acquisition means for detecting the traveling direction of the moving body,
The position information providing apparatus according to claim 4, wherein the coordinate calculation unit corrects relative coordinates from the reference point based on the traveling direction. In a position information providing system comprising: a receiving device that receives a notification of the current position of its own device; and a position information providing device that transmits the position of the receiving device to the receiving device;
The position information providing device includes:
Reference position acquisition means for acquiring the position of a reference point on the moving body;
A transmission unit installed at a predetermined position in the moving body and notifying the receiving apparatus as absolute coordinates of the own device;
Coordinate calculation means for calculating absolute coordinates of the transmission means based on the position of the mobile body at the reference point and the relative coordinates from the reference point in the transmission means. Location information provision system. In the position information providing method for providing information indicating the position of the receiving device to the receiving device,
A reference position acquisition step of acquiring a position at a reference point of the moving body;
The transmission based on the relative coordinates from the reference point in the transmitting means for notifying the receiving device of the position of the moving body at the reference point and the absolute coordinate of the own device installed at a predetermined position in the moving body. A coordinate calculation step for calculating absolute coordinates of the means;
And a position information transmitting step of transmitting the calculated coordinates from the transmitting means to the receiving apparatus as position information.

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