JP2003296889A - System for monitoring position of mobile object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To monitor the positions of a plurality of mobile objects at the same time in a system for monitoring the position of the mobile object. <P>SOLUTION: A position monitoring system is constructed. A plurality of position information transmitters 100 detect position information at the preset time or the time specified from a position monitoring device 200 and respectively transmit the position information to the position monitoring device 200. Data are exchanged between the position information transmitters 100 and the position monitoring device 200 through a wireless repeater station WRS, the Internet INT and a general public line PN. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile position monitoring system.

[0002]

2. Description of the Related Art Conventionally, there is a position monitoring system for monitoring the positions of a plurality of moving bodies. The position monitoring system includes a position information transmitting device and a position monitoring device. This position monitoring system includes, for example, the Global Positioning System (GP).
S: Global Positioning System) A mobile device is equipped with a position information transmission device that detects and transmits position information (latitude, longitude) based on a radio signal received from a satellite, and a position monitoring device receives the position information transmission device from the position information transmission device. There is a type that monitors the position of the moving body based on the position information.

For example, in Japanese Patent Laid-Open No. 10-104336, bidirectional communication is enabled between a position monitoring device and a position information transmitting device, and the position monitoring device requests the position information transmitting device for position information. There is disclosed a technique in which the position monitoring device monitors the position of the moving body by performing the transmission and the position transmitting device transmitting the position information in response to the request.

[0004]

However, in the conventional position monitoring system, when monitoring the positions of a plurality of moving bodies,
Usually, since the position information is transmitted from each position information transmitting device at unsynchronized discrete times, the position monitoring device can monitor only the position of each moving body at different times. Also, according to the technique disclosed in Japanese Patent Application Laid-Open No. 10-104336, when the position information transmitting devices receive the request signal from the position monitoring device at different timings, the position information transmitting devices receive the position information at the same time. In some cases, it is not possible to monitor the position of each moving body at the same time because it is not possible to transmit. The deviation of the timing of signal exchange can occur remarkably particularly when communication is performed using a public line.

The present invention has been made to solve the above problems, and an object thereof is to monitor the positions of a plurality of moving bodies at the same time in a moving body position monitoring system.

[0006]

[Means for Solving the Problem and Its Action / Effect] In order to solve at least a part of the above problem, the present invention adopts the following configuration. The position information transmitting device of the present invention is a position information transmitting device which is provided in a mobile body and which transmits the position information of the mobile body to a predetermined position monitoring device, the detection time relating to the detection time at which the position information should be detected. The gist of the present invention is to include a storage unit that stores information, a position information detection unit that detects at least the position information at the detection time, and a transmission unit that transmits the position information at the detection time.

The position information detecting section may detect the position information not only at the preset detection time but also at another time. For example, the position information may be constantly detected. In this case, the transmission unit may extract and transmit the position information at the detection time. With the above configuration, even when there are a plurality of position information transmitting devices, each position information transmitting device can transmit the position information detected at the same time. The transmission timing of the position information from each position information transmission device does not need to be synchronized. With the position information transmitting device of the present invention, the position monitoring device can monitor the positions of a plurality of moving bodies at the same time. In addition, in this specification, the “moving body” is not limited to an object (object) and has a broad meaning including humans and animals.

In the position information transmitting apparatus of the present invention, the position information detecting section may detect the position information at the detection time.

By doing so, the load on the position information detecting portion can be reduced.

In the position information transmitting apparatus of the present invention, various modes can be applied to the detection of position information.
For example, the position information detection unit may detect the position information based on a signal from the outside for detecting the position information.

Here, examples of the "signal from the outside for detecting position information" include a radio signal from a global positioning system (hereinafter referred to as GPS) satellite. In recent years, a technique for detecting position information of a moving body using a global positioning system has become widespread. Therefore, with the above configuration, the position information can be easily detected.

The position information detecting section uses a method using DGPS (differential GPS) that uses both radio waves from GPS satellites and ground waves, a method using radio waves from a radio base station such as a mobile phone, PHS, and the like. Alternatively, the position information may be detected by a method using a gyro sensor or a combination thereof.

In the position information transmitting device of the present invention, a clock may be provided in the device and the current time may be acquired from the clock in this device. Furthermore, a signal from the outside including information on the current time may be obtained. The position information detection unit may be configured to determine whether the current time acquired by the current time acquisition unit has reached the detection time. .

By doing so, the position information transmitting device can easily obtain the accurate current time and judge the detection time. As a result, when there are a plurality of position information transmitting devices, it is possible to suppress the time difference between the position information transmitting devices.

In the above position information transmitting device, when the position information detecting unit detects the position information based on a signal from the global positioning system satellite, the current time acquisition unit is a global positioning system satellite. The present time may be detected based on a signal from

The radio wave transmitted from the GPS satellite also includes information indicating the current time. Therefore, with the above configuration, the current time can be easily acquired while detecting the position information.

When the current time acquisition unit acquires the current time based on a signal from the outside, for example, the current time may be detected based on a standard time radio wave used in a so-called radio clock. Good. Further, when the position information transmitting device is connectable to the Internet, the current time may be acquired from a so-called time server existing on the Internet.

In the position information transmitting device of the present invention, further, a control information acquisition unit for acquiring control information for controlling the detection time information from the position monitoring device, and the detection time information based on the control information. May be provided.

For example, the new detection time information set on the position monitoring device side can be used as control information, and the new detection time information acquired by the control information acquisition unit can be stored in the storage unit and used. . Further, the storage unit may store a plurality of sets of detection time information in advance so as to be switchable, and the instruction information for switching the detection time information may be the control information. By doing so, the position information can be detected and transmitted at the time designated by the position monitoring device.

In the above position information transmitting apparatus, the transmitting section may transmit a part of the position information.

Generally, latitude and longitude are used as the position information. When the position information transmitting device is used in a narrow area, only some values of “degree”, “minute”, and “second” may change. In such cases,
For example, the amount of data communication can be reduced by transmitting only the value of "second" which is a part of the position information.

In the position information transmitting device of the present invention, a dedicated network for communicating with the position monitoring device may be prepared. However, the transmitting unit may transmit the position information via a multipurpose communication line. Is preferably transmitted.

Here, as the "multipurpose communication line",
Examples include so-called subscriber telephone lines, ISDN lines, ADSL lines, PHS lines, and existing communication lines that can be used by a limited number of people for various purposes such as public broadcasting. With the above configuration, the present invention can be easily realized by effectively utilizing the existing communication equipment.

The present invention can also be configured as an invention of a position monitoring device. That is, the position monitoring device of the present invention is a position monitoring device for monitoring the positions of a plurality of moving bodies, wherein the plurality of moving bodies provide detection time information relating to the detection time at which the position information of the moving bodies should be detected. A storage unit that stores the control information, a control information acquisition unit that acquires control information for controlling the detection time information from the position monitoring device, and a detection time control unit that controls the detection time information based on the control information. ,
At least the position information detection unit that detects the position information at the detection time, and a transmission unit that transmits the position information at the detection time, and a position information transmission device, comprising, the position monitoring device, A control information transmitting unit that transmits the control information to the position information transmitting device, an electronic map data reference unit that refers to electronic map data for displaying an electronic map, and the position information transmitted from the position information transmitting device. And a display control unit for displaying the positions of the plurality of moving bodies on the electronic map using the electronic map data based on the position information and a receiving side position information acquiring unit. To do.

By doing so, the position information transmitting device can be caused to detect and transmit the position information at the time designated by the position monitoring device, and the position information of the moving body can be displayed and monitored on the electronic map. Further, since it is not necessary to transmit a request signal from the position monitoring device to the position information transmitting device in order to acquire the position information of the position information transmitting device, the number of times of communication between the position information transmitting device and the position monitoring device and It is possible to reduce the data communication amount and the communication cost.

The present invention can be configured as an invention of a position information transmitting device and a position monitoring device, as well as a position information transmitting device control method and a position monitoring device control method. In addition, it is possible to realize in various forms such as a computer program for realizing these, a recording medium recording the program, and a data signal embodied in a carrier wave including the program. It is possible to apply the various additional elements shown above in each aspect.

When the present invention is configured as a computer program or a recording medium recording the program, it may be configured as an entire program for driving the position information transmitting device and the position information monitoring device. You may comprise only the part which performs a function. As the recording medium, a flexible disk, a CD-ROM, a DVD-ROM, a magneto-optical disk, an IC
Various computer-readable media such as cards, ROM cartridges, punched cards, printed materials on which codes such as bar codes are printed, computer internal storage devices (memory such as RAM and ROM), and external storage devices can be used.

[0028]

Other Embodiments of the Invention The present invention can also be configured in the following modes. That is, the position information transmitting device of the present invention is
A position information transmitting device that is provided in a moving body and transmits the position information of the moving body to a predetermined position monitoring device, and acquires a position information detecting unit that detects the position information and a detection time when the detection is performed. The gist is to include a detection time acquisition unit that performs the above, and a transmission unit that transmits the position information and the detection time in association with each other.

The detection of the position information and the acquisition of the detection time are
It may be carried out all the time or at a preset time. Further, the transmission of the position information and the detection time may be performed each time each is detected, or may be performed at a preset time. With the above configuration, the position monitoring device can specify when the position information transmitted from the position information transmitting device is detected,
The position of the moving body can be monitored at any time or at a predetermined time.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in the following order based on Examples. A. Position monitoring system: B. Position information transmitter: C.I. Position monitoring device: D. Transmission of location information: E. Update of transmission time information: F. Modification:

A. Position Monitoring System: FIG. 1 is an explanatory diagram showing a schematic configuration of a position monitoring system as an embodiment of the present invention. In this embodiment, a golf cart monitoring system 100 that monitors the position of a golf cart on a golf course.
0 will be described as an example.

The golf cart monitoring system 1000 includes a plurality of golf carts C including the position information transmitting device 100.
1, C2, C3, ... And a position monitoring device 200.

The position information transmitting device 100 includes a GPS antenna 160, an antenna 170, a wireless communication device (not shown), a control unit and the like. Each position information transmitting device 100 has three G
Position information is detected based on radio signals received from PS satellites SAT1, SAT2, SAT3, and this position information is transmitted from antenna 170 to wireless relay station WRS and Internet I.
Position monitoring device 200 via NT and general public line PN
Send to.

The position monitoring device 200 includes a monitor 270,
A CD-ROM drive 232, a keyboard KB, a mouse MS, etc. are provided. The position monitoring device 200 uses the position information received from each position information transmitting device 100 and the CD.
-Compact disc C using ROM drive 232.
Based on the electronic map data read from D, an electronic map and a plurality of golf carts C1, C are displayed on the monitor 270.
The positions of 2, C3, ... Are displayed.

B. Position Information Transmission Device: FIG. 2 is an explanatory diagram showing a schematic configuration of the control unit 10 of the position information transmission device 100. The control unit 10 includes a CPU, RAM, R
It is configured as a microcomputer including an OM and the like, and includes a control unit 110, a communication unit 120, a position information detection unit 130, a current time acquisition unit 140, and a storage unit 150. Each of these functional blocks is constructed by software.

The control section 110 controls each section in the control unit 10. The communication unit 120 is a wireless communication relay station WR.
It wirelessly communicates with S and exchanges data with the position monitoring device 200 via the Internet INT and the general public line PN. That is, the communication unit 120 transmits the position information to the position monitoring device 200 with the device number of the position information transmitting device 100 attached thereto so that the sender can be identified, and the position monitoring device 200 also transmits the position information. The received transmission time information is received. The position information and the transmission time information will be described later.

The position information detection unit 130 uses the GPS satellite SA.
Based on the radio signal from T1, SAT2, SAT3,
Detects location information (latitude and longitude). The position information is detected based on the transmission time information. In this embodiment, the position information detection unit 130 detects the latitude and longitude based on the radio signals from the three GPS satellites, but based on the radio signals from the four GPS satellites. Further, the altitude may also be detected.

The current time acquisition unit 140 uses the GPS satellite SA
Based on the radio signal from T1, SAT2, SAT3,
Detect the current time. The current time is detected at any time.

The storage section 150 stores in advance transmission time information relating to the transmission time at which the position information should be transmitted. As described above, this transmission time information is also used to detect the position information in the position information detection unit 130 and corresponds to the “detection time information” of the present invention. Storage unit 15
0 also stores the transmission time information received by the communication unit 120 from the position monitoring device 200. When the communication unit 120 receives the transmission time information from the position monitoring device 200,
The newly received transmission time information is preferentially used. In the present embodiment, the storage unit 150 separately stores the preset transmission time information and the transmission time information received from the position monitoring device 200. The transmission time information received from the position monitoring device 200 may be overwritten on the preset transmission time information.

FIG. 3 is an explanatory diagram showing an example of the transmission time information. As shown in the figure, the storage unit 150 stores a list of transmission times as transmission time information. In addition,
The storage unit 150 may store, as the transmission time information, a reference transmission time and a transmission time interval serving as a reference. For example, if the reference transmission time is 9:00 and the transmission time interval is 5 minutes, the transmission time becomes the same as the list shown in the figure.

C. Position Monitoring Device: FIG. 4 is an explanatory diagram showing a schematic configuration of the position monitoring device 200. Position monitoring device 2
00 includes a control unit 210, a communication unit 220, a position information storage unit 230, an electronic map data reference unit 240, a command input unit 250, and a display control unit 260.
Each of these functional blocks is constructed in software by installing application software capable of realizing each function in a personal computer.

The control section 210 controls each section. The communication unit 220 includes a wireless communication relay station WRS and the Internet I.
Data is exchanged with the position information transmitting apparatus 100 described above via the NT and the general public line PN. That is, the communication unit 220 receives the position information transmitted from the position information transmitting device 100, and the position information transmitting device 100
The transmission time information set by the user of the position monitoring device 200 is transmitted.

The position information storage section 230 stores data such as position information received by the communication section 220 from the position information transmitting apparatus 100. This data will be described later. The position information storage unit 230 may be provided in a predetermined server on the Internet INT, for example. In this case, the position information transmitting device 100 described above
The location information may be transmitted to this server.

The electronic map data reference section 240 reads the electronic map data recorded on the compact disc CD based on the position information by using the CD-ROM drive. In the present embodiment, the electronic map is read from the compact disc CD, but the DVD on which the electronic map data is recorded is recorded.
For example, it may be read from another recording medium. A server holding electronic map data may be prepared on the Internet INT and read from this server.

The command input section 250 is a keyboard KB
Input an instruction from the user made using the or mouse MS. This instruction includes an instruction for switching the display of the monitor 270 and an instruction regarding transmission time information.

FIG. 5 is an explanatory diagram showing an example of data stored in the position information storage section 230. As shown,
The position information storage unit 230 stores the latitude and longitude as the position information of each golf cart received from the position information transmitting device 100 and the reception time in association with the golf cart.

The display control unit 260 (FIG. 4) uses the data in the position information storage unit 230 and the electronic map data reference unit 240.
And the electronic map data read by the command input unit 250
Based on the instruction from the user input from the electronic map and each golf cart C1, C2, C on the monitor 270.
The position of 3, ... is displayed.

FIG. 6 is an explanatory diagram showing an example of a display screen displayed on the monitor 270. Position P on the golf course
1 shows that golf carts C1 and C2 are present at P2. The user inputs a command by operating the toolbar TB using the mouse MS to switch the display screen such as displaying all courses or the selected course, moving the display position, and enlarging,
It can be reduced.

D. Transmission of Position Information: FIG. 7 is a flowchart showing a flow of a position information transmission process in the position information transmitting apparatus 100. This is a process performed by the CPU in the control unit 10. First, the current time acquisition unit 140
Then, the current time detected based on the radio signal from the GPS satellite is acquired (step S100). Next, the transmission time information stored in the storage unit 150 is referred to (step S110), and it is determined whether or not the current time reaches the transmission time (step S120). If the current time has not reached the transmission time, acquisition of the current time and reference to the transmission time are repeated until the transmission time. If the current time has reached the transmission time, the position information is acquired from the position information detection unit 130 (step S130), and this is transmitted to the communication unit 120.
Is transmitted to the position monitoring device 200 (step S1)
40). In the present embodiment, the position information transmitting apparatus 100 is used in a narrow area such as a golf course, so that only “second” of the latitude and longitude values of “degree”, “minute”, and “second” changes. Therefore, the position information transmitting device 100 transmits only the value of “second” to the position monitoring device 200. By doing so, the amount of data communication can be reduced. All values of “degree”, “minute”, and “second” may be transmitted.

In this embodiment, the position information is detected when the transmission time is reached, but the position information is detected at any time in the same manner as the detection of the current time, and the current time is the transmission time. When the time reaches, the position information detected immediately before the transmission time may be transmitted. Further, the position information may be detected at a preset time (for example, one minute before the transmission time) based on the transmission time information, and the position information may be transmitted when the transmission time is reached.

E. Update of transmission time information: FIG. 8 is a flowchart showing a flow of update processing of transmission time information.
The process in the position monitoring device 200 is shown on the right side of the figure, and the process in the position information transmitting device 100 is shown on the left side. First, on the position monitoring device 200 side, the transmission time information is input from the command input unit 250 (step S210) and transmitted to the position information transmitting device 100 (step S220). The position information transmitting device 100 side receives the transmission time information transmitted from the position monitoring device 200 (step S23).
0), and save it in the storage unit 150 (step S230).
By doing so, the position monitoring device 200 causes the position information transmitting device 100 to set the transmission time preset in the storage unit 150 of the position information transmitting device 100 to the position monitoring device 20.
The position information can be updated from 0 to the designated time, and the position information can be transmitted at the updated time.

According to the position monitoring system of this embodiment described above, the position information transmitting apparatus 100 can detect the position information at the preset time or the time designated by the position monitoring apparatus 200. Therefore, even when there are a plurality of position information transmitting devices 100, each position information transmitting device 100 can detect and transmit the position information at the same time by setting the same transmission time information. it can. As a result, the position monitoring device 200 can display and monitor the positions of a plurality of golf carts at the same time.

Further, since the position monitoring device 200 can acquire the position information without requesting the position transmitting device 100 to transmit the position information, the position information transmitting device 100
It is possible to reduce the number of times of communication between and with and the amount of data communication and to reduce the communication cost.

Since the position monitoring device 200 can monitor the position of each golf cart at the same time, the user of the position monitoring device 200 speeds up the progress of the play to the player who is behind in the progress of the play. Can be urged.

F. Modifications: Some embodiments of the present invention have been described above, but the present invention is not limited to such embodiments, and various modifications can be made without departing from the scope of the invention. It can be implemented. For example, the following modifications are possible.

F1. Modification Example 1 In the above-described embodiment, the position information detection unit 130 of the position information transmission device 100 detects position information based on the radio signal from the GPS satellite received by the GPS antenna 160, but the present invention is not limited to this. Absent.
For example, D that uses a combination of radio waves from GPS satellites and ground waves
The current position may be detected by a method using GPS (differential GPS), a method using radio waves from a wireless base station such as a mobile phone or PHS, or a method using or using a gyro sensor.

F2. Modified Example 2: In the above embodiment, the current time acquisition unit 140 of the position information transmitting apparatus 100 acquires the current time based on the radio signal from the GPS satellite received by the GPS antenna 160, but the present invention is not limited to this. For example, the current time may be acquired based on a standard time radio wave used in a so-called radio timepiece. Alternatively, the current time may be acquired from a so-called time server that exists on the Internet. Further, the position information transmitting apparatus 100 may be equipped with a clock, and the current time may be acquired from this clock.

F3. Modified Example 3: In the above-described embodiment, the position monitoring device 200 enables transmission of the transmission time information set on the position monitoring device 200 side, and the position information transmitting device 100 transmits the transmission time information according to the transmission time information transmitted from the position monitoring device 200. Although the position information can be detected and transmitted, the present invention is not limited to this. For example, the position information transmitting apparatus 100 may hold a plurality of sets of transmission time information in advance, and the transmission time information may be switched and used according to a switching instruction from the position monitoring apparatus 200.

F4. Modification 4: In the above embodiment, the position information transmitting device 100 and the position monitoring system 200 communicate with each other using the wireless communication relay station WRS, the Internet INT, and the general public line PN, but the present invention is not limited to this. Absent. A dedicated communication network may be used. However, according to the above embodiment, there is an advantage that the existing communication equipment can be effectively used.

F5. Modification 5: In the above embodiment, the position information transmitting apparatus 100 detects and transmits position information according to the transmission time, but the present invention is not limited to this. The position information transmitting device may associate the detected position information with the detection time regardless of the transmission time and transmit the position information to the position monitoring device. In this case, the detection of the position information and the acquisition of the detection time may be performed all the time or at a preset time. Further, the transmission of the position information and the detection time may be performed each time each is detected, or may be performed at a preset time. By doing so, the position monitoring device can specify when the position information transmitted from the position information transmitting device is detected, and therefore, for a plurality of golf carts, at any time or at a predetermined time. The position at the time of can be monitored.

F6. Modification 6: In the above embodiment, the case where the position of the golf cart is monitored on the golf course has been described as an example, but the present invention is not limited to this. The present invention generally relates to a position information transmission device provided in a moving body including humans and animals,
And a position monitoring device.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a position monitoring system as an embodiment of the present invention.

2 is an explanatory diagram showing a schematic configuration of a control unit 10 of the position information transmitting apparatus 100. FIG.

FIG. 3 is an explanatory diagram showing an example of transmission time information.

FIG. 4 is an explanatory diagram showing a schematic configuration of a position monitoring device 200.

5 is an explanatory diagram showing an example of data stored in a position information storage unit 230. FIG.

FIG. 6 is an explanatory diagram showing an example of a display screen displayed on a monitor 270.

7 is a flowchart showing a flow of position information transmission processing in position information transmitting apparatus 100. FIG.

FIG. 8 is a flowchart showing a flow of update processing of transmission time information.

[Explanation of symbols]

1000 ... Golf cart monitoring system 100 ... Positional information transmitter 10 ... Control unit 110 ... Control unit 120 ... Communication unit 130 ... Positional information detector 140 ... Current time acquisition unit 150 ... storage unit 160 ... GPS antenna 170 ... antenna 200 ... Position monitoring device 210 ... Control unit 220 ... communication section 230 ... Position information storage unit 240 ... Electronic map data reference section 250 ... Command input section 260 ... Display control unit 270 ... Monitor WRS ... Wireless communication relay station INT ... Internet PN ... General public line

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Claims (12)

[Claims] 1. A position information transmitting device which is provided in a mobile body and which transmits position information of the mobile body to a predetermined position monitoring device, and stores detection time information relating to a detection time at which the position information should be detected. A position information transmission device comprising: a storage unit; a position information detection unit that detects at least the position information at the detection time; and a transmission unit that transmits the position information at the detection time. 2. The position information transmission device according to claim 1, wherein the position information detection unit detects the position information at the detection time. 3. The position information transmitting device according to claim 1, wherein the position information detection unit detects the position information based on a signal from the outside for detecting the position information. Information transmission device. 4. The position information transmitting device according to claim 1, further comprising a current time acquisition unit that acquires the current time based on a signal from the outside including information related to the current time. The position information transmission device, wherein the position information detection unit determines whether or not the current time acquired by the current time acquisition unit has reached the detection time. 5. The position information transmission device according to claim 4, wherein the position information detection unit detects the position information based on a signal from a global positioning system satellite, and the current time acquisition unit includes: A position information transmitting device for detecting the current time based on a signal from a global positioning system satellite. 6. The position information transmission device according to claim 1, further comprising a control information acquisition unit that acquires control information for controlling the detection time information from the position monitoring device. A position information transmission device, comprising: a detection time control unit that controls the detection time information based on the control information. 7. The position information transmitting device according to claim 1, wherein the transmitting unit transmits a part of the position information. 8. The position information transmitting apparatus according to claim 1, wherein the transmitting unit transmits the position information via a multipurpose communication line. 9. A position monitoring device for monitoring the positions of a plurality of moving bodies, wherein the plurality of moving bodies include a storage unit that stores detection time information regarding a detection time at which the position information of the moving bodies should be detected. A control information acquisition unit that acquires control information for controlling the detection time information from the position monitoring device; and a detection time control unit that controls the detection time information based on the control information, at least the detection time. A position information detecting unit for detecting the position information in the position information transmitting device, and a transmitting unit for transmitting the position information at the detection time, and the position monitoring device, the position information transmitting device. A control information transmitting unit that transmits the control information to the electronic map data; an electronic map data reference unit that refers to electronic map data for displaying an electronic map; A reception side position information acquisition unit that acquires the position information, and a display control unit that displays the positions of the plurality of mobile objects on the electronic map using the electronic map data based on the position information. Position monitoring device. 10. A method of controlling a position information transmitting device, which transmits position information of a mobile body to a predetermined position monitoring device, comprising:
(A) preparing detection time information regarding a detection time at which the position information should be detected; (b) detecting the position information at least at the detection time; and (c) collecting the position information at the detection time. And a step of transmitting. 11. A computer program for controlling a position information transmitting device that transmits position information of a mobile body to predetermined position monitoring information, and stores detection time information relating to a detection time at which the position information should be detected. A computer program for causing a computer to realize a function, at least a function of detecting the position information at the detection time, and a function of transmitting the position information at the detection time. 12. A recording medium on which the computer program according to claim 11 is recorded so that it can be read by a computer.