JPH11160085A - Position measuring method and its system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle apparatus for a position measuring system having a means for obtaining a position of a vehicle traveling on a road and a traveling locus with a simple constitution. SOLUTION: A position measuring apparatus 100 carried on a vehicle 12 comprises a photoreceiver 1 for receiving a light beacon signal including position information from a vehicle sensing and communicating unit 13 installed on a road, a position receiver 2 for taking out the position information from a received signal, and autonomous travel detector 5 for detecting an autonomously traveled moving direction and distance, a memory 6 for storing a road map, a position deciding unit 4 for calculating a present position of the vehicle at this time point according to the position information and the autonomously traveled moving direction and a distance information, for reading the map stored in the memory 6 and for specifying the present position on the read map, and a display unit 7 for displaying the map and the specified spot by superposing them by a predetermined symbol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a position on the ground, and more particularly to a means for obtaining a road running position and a running locus of a vehicle such as an automobile and a truck with a simple configuration.

[0002]

2. Description of the Related Art Accurately measuring the traveling position and trajectory of a vehicle is the most important issue in car navigation, distribution management, distribution services, and the like.

Conventionally, as described in various papers and product catalogs, a GPS (Global Positioning System) that receives radio waves from a plurality of artificial satellites, obtains a difference between elements included therein, and calculates latitude, longitude, and altitude. Positioning System). One of these methods is differential GPS
It is widely used as a conventional mainstream technology.

[0004]

The above prior art has the following problems. (1) Since the information of the GPS signal transmitted from the existing artificial satellite is premised, if the radio wave cannot be received or the received content cannot be interpreted for some reason, the position measurement becomes impossible. (2) Correction and inspection of the satellite itself occur regularly / irregularly.
If the information at this timing is adopted, a large measurement error occurs. (3) The movement of the satellite operates on a fixed orbit determined by the relationship between itself and the earth, and is not related to the road network on the ground, so information on landmarks (goals, landmarks, etc.) on the ground Can not be obtained.

[0005] Each of these will be described below. Regarding the above (1), since the operation purpose of satellites is not mainly GPS at present, but other commercial, scientific and strategic needs are the main, the information acquisition base for GPS is extremely vulnerable. I can't get it. For example, when a strategic defense event occurs, it is expected that the emission of radio waves will be stopped or the information will be encrypted (scrambled). In such a state, the functions of the car navigation, the logistics management, and the distribution service using the GPS position as the sole means are all stopped. If the above (1) has not occurred, the above (2) becomes a problem. In other words, dozens of artificial satellites output information different from normal for regular health check and correction regularly / irregularly, so even if the information from other satellites used is accurate, a large error occurs. Outbreaks are inevitable.

Further, the above (3) is natural because the artificial satellite is operated irrespective of the terrain on the ground or the road network.

However, the object of the present invention relates to the traveling of vehicles traveling on the ground (including some underground),
If there is no landmark information, it is difficult to accurately specify the position and reproduce the travel history unless an extremely large amount of movement information is stored.

Accordingly, the present invention has been made in consideration of the above-mentioned problems in the prior art, and has as its object to provide a position measuring method for measuring an accurate position with a simple configuration, a roadside device for realizing the same, and An object of the present invention is to provide a position measurement system including an in-vehicle device.

Another object of the present invention is to provide a position measuring method and a system including a means for recording a long-term running history with a small amount of stored data in the above-described position measuring system, and a vehicle-mounted device of the system. Is to provide.

[0010]

In order to achieve the above object, a position measuring system according to the present invention comprises an on-vehicle device mounted on a vehicle running on a road and a plurality of on-vehicle devices installed apart from each other along the road. A roadside device.

[0011] Each of the plurality of roadside devices includes, for example, wireless communication means, storage means for storing position information indicating a position of a communicable range of the wireless communication means, and position information stored in the storage means. Control means for controlling the wireless communication means so as to transmit the included signal to a vehicle passing through the communicable range.

The on-vehicle device includes, for example, receiving means for receiving a signal transmitted from the roadside device, and position information (x, y) indicating a position of a communicable area of the roadside device from the received signal. Position receiving means for extracting the information, autonomous traveling detection means for detecting the traveling direction and distance (Δx, Δy) of the autonomous travel, and the traveling direction and distance information of the location information (x, y) and the autonomous traveling (Δx, Δy)
Position determining means for calculating the current position (x + Δx, y + Δy) of the vehicle at the time.

The roadside device can be realized, for example, by a vehicle detection / communication device in which a device called an optical beacon in Japan is installed at a major intersection nationwide. Regarding positional information to be communicated, latitude (x), longitude (y),
Alternatively, at least an intersection number uniquely numbered nationwide is required. In the case of an intersection number, the corresponding absolute coordinates may be stored in advance and determined for collation.

Further, the autonomous traveling detection means of the on-vehicle device can be realized by a known technique such as a gyro, a magnetic compass, a distance detector and the like. In addition, in order to achieve the above object, in the position measurement system of the present invention, the in-vehicle device includes a receiving unit for receiving a signal including position information transmitted from each of the plurality of roadside devices, Position receiving means for extracting position information from the signal, time management means for managing the time, storage means for storing information relating to the traveling trajectory of the vehicle, and each time a signal including the position information is received, the position information is extracted. The position indicated by the position information is determined as the current position of the vehicle equipped with the device, and the current position and the current time obtained by the time management unit are stored in the storage unit as travel path information. Means.

Further, in addition to storing the position at the time when the position information is received from the vehicle detection / communication device, the on-vehicle device may further include, at regular intervals after receiving the position information by the time management means, The time at that time, and the current position (x + ΔX, y + Δy) at that time determined by the position determination means using the received position information and the autonomous travel detection means are stored as travel locus information. You may comprise so that it may do.

Further, in order to achieve the above object, in the position measuring method of the present invention, signals including position information indicating the positions of the points are transmitted by radio communication from a plurality of points separated from each other along a road. The in-vehicle device equipped with a wireless communication function mounted on a vehicle passing through any of the plurality of points acquires the transmitted position information, and autonomously determines the traveling direction and distance traveled after acquiring the position information. And the current position of the vehicle is determined from the acquired position information and the autonomously detected moving direction and distance.

In order to achieve the above object, according to the position measuring method of the present invention, signals including position information indicating the positions of the points are transmitted by radio communication from a plurality of points separated from each other along a road. The in-vehicle device equipped with a wireless communication function mounted on a vehicle passing through any of the plurality of points acquires the transmitted position information, and travels the acquired position information and the time at that time. Store as information.

According to the present invention, the accurate position of the transportation means that travels on a road such as a vehicle can be detected by a device having a simple configuration without relying on radio wave information from artificial satellites or the like and without variation in accuracy. be able to. In addition, the traveling history can be stored for a long time with a very small storage capacity.

Since the position measuring system according to the present invention operates as follows, the above object can be achieved.

Vehicle detection / communication devices such as optical beacons have already been rapidly deployed at major intersections, and the number of vehicles equipped with devices for communicating with this device is increasing. The case where the present invention is applied to this road-vehicle communication system will be described as an example.

First, at the communication timing with each of the vehicle detection / communication devices, an accurate position is taken out by the position receiving means. The error is substantially zero. Next, while traveling between intersections, the traveling direction and distance can be obtained by the autonomous traveling detection means. The error here does not become larger than the directional distance to the next intersection. In this way, the intersection where the vehicle detection / communication device is installed is always used as a passage index, so that an accurate position can be obtained without a large error. By superimposing and displaying the current position thus obtained on the map displayed on the display device, a user such as a driver can easily confirm the current position of his or her vehicle.

Further, since the communication timing with the vehicle detection / communication device is used and the time information at this timing is stored as key information in the storage means, the storage capacity is extremely small. For example, consider a case in which the distance between intersections is 1 km and information is stored, for example, every two seconds in order to accurately record the traveling locus. Assuming that the vehicle is in an urban area, when traveling at an average speed of 10 km / h, it takes 6 minutes to travel 1 km.
(Minute) × 60 (second / minute) ÷ 2 (second) = 180. On the other hand, according to the present invention, the position of the intersection (information amount = 1) is stored as it is. That is, when the present invention is used, the storage capacity can be reduced to 1/180.

The route between the intersections can be accurately reproduced by referring to the digital map information, so that the accuracy does not decrease. Although the storage capacity of the device mounted on the vehicle is extremely limited, the present invention enables a running history of several weeks to several months to be recorded with a limited capacity.

In order to cope with a suburb or a mountainous area with few intersections or an area where the installation of the vehicle detection / communication device is not sufficiently advanced, the timing at which the position information is received from the vehicle detection / communication device as described above. In addition to the start of the vehicle, by storing the time and position at regular intervals after receiving the position information, it is possible to store an accurate running history.

In the system of the present invention, the GPS
By sharing and interpolating the receiving device and the autonomous traveling detection means,
It goes without saying that an in-vehicle device provided with a more accurate position determining means can be provided.

Further, the on-vehicle apparatus further includes means for transmitting the current position information of the vehicle to a base station or the like which supervises the position measurement system by using other wireless communication means such as a mobile phone, Operation management for transmitting the current position information of the vehicle to the base station by the mobile phone at a predetermined timing such as a storage timing of the measured position or a communication timing with the vehicle detection / communication device, or at regular intervals. A system may be configured.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of an embodiment of the position measuring system according to the present invention. The system according to the present embodiment includes a road 11 on which a vehicle 12 such as an automobile or a truck travels.
Vehicle detection and communication device 13 (roadside device) installed above
And a position measuring device 100 (on-vehicle device) mounted on the vehicle 12.

When a vehicle passes through a communicable area near the device, the vehicle detection / communication device 13 detects this by using a beacon or the like using light or radio waves, and provides information on nearby road conditions, parking lot information, and the like. The position information such as the latitude and longitude of the corresponding point is transmitted to the detected vehicle. In Japan, such vehicle detection / communication devices are being installed near major intersections on roads.

In this embodiment, the vehicle detection / communication device 13
Using an optical beacon, an optical beacon transmitting and receiving unit 1
33, a storage unit 132 for storing at least positional information such as the latitude and longitude of the installation position of the device,
33 and the operation of the storage unit 132 to detect a passing vehicle by detecting a signal or the like transmitted by the vehicle,
A control unit 131 for transmitting predetermined information such as position information to the detected vehicle is provided.

The position measuring device 100 mounted on the vehicle 12
Is a light receiving device 1 for receiving a beacon signal from the vehicle detection / communication device 13, and a position receiving device 2 for extracting position information (x, y) included in the signal received by the light receiving device 1.
And the traveling direction and distance (Δx, Δ
y), a first storage device 6 for storing a road map, and the position information (x,
y) and the traveling direction and distance information (Δ
x, Δy), the current position of the vehicle at that time (x +
Δx, y + Δy) and the first storage device 6
And a display device 7 for reading out the map stored in the map and specifying the current position on the map, and a display device 7 for displaying the map and the specified point in a superimposed manner with a predetermined symbol. Is done.

FIG. 8 shows an example of the processing procedure of the position determining device 4.

This process is started at the timing when a position measurement request is input by the driver (user), and the position information (x, y) obtained by the nearest vehicle detection / communication device 13 as input and the autonomous traveling Autonomous traveling information (Δx, Δ) from the position (x, y) obtained by the detection device 5
y).

Next, in process A, the current position (x + Δx, y
+ Δy). In process B, map information is read from the first storage device 6. Finally, in a process C, a predetermined symbol indicating the current position where the vehicle 12 is traveling is superimposed on the map and displayed on the display device 7. FIG. 3 shows a situation where a symbol ■ indicating the current position of the vehicle is displayed on the display device 7 along with the map by the present processing procedure.

According to the present embodiment, information on the position of the vehicle detection / communication device 13 is transmitted to the vehicle 12 based on the beacon signal of the vehicle detection / communication device 13 installed on the road, and this is transmitted to the vehicle. Received by the position measurement device 100,
By autonomously measuring the subsequent positions, the position at the time requested by the user can be determined with a simpler device configuration and with high accuracy.

A second embodiment of the position measuring apparatus 100 to which the present invention is applied will be described with reference to FIGS.

The apparatus according to the present embodiment is the same as the position measuring apparatus 100 shown in FIG. 1 except that a timer 3 for managing the time and a second storage device 8 for storing the running trajectory are added. The other devices are the same as those in the embodiment of FIG. 1 described above, and a description thereof will be omitted.

In the apparatus according to the present embodiment, the date, time, date, minute, and second determined by the timer 3 at the timing when the position information transmitted by the optical beacon signal is received by the light receiving device 1 and the received position (x, The position determination device 4 operates so that y) is written in the second storage device 8 in association with y).

FIG. 9 shows a processing flow of the position determining device 4 of the present embodiment.

This process is started when the position information from the vehicle detection / communication device 13 is received, and the processes A to C are executed.
Executes the same processing procedure as in FIG. Further, in the process D, the time at the start timing is fetched from the timer 3 in order to store the traveling history, and then, in the process E, the time and the position information are written into the second storage device 8.

FIG. 4 shows the traveling locus of the vehicle obtained on the result of this processing procedure on a map. In the figure, the position at which the position measurement device 100 has received the position information from the vehicle detection / communication device 13 is indicated by a symbol ○. Here, it is assumed that the vehicle detection / communication device 13 is installed at each intersection.
The position where 3 is installed is not limited to the intersection, and it goes without saying that it may be installed at a position along the road outside the intersection. Further, in FIG. 4, in order to make the movement of the vehicle clearer, symbols indicating the vehicle and characters “start” and “end” are displayed, but they may be omitted as necessary.

In the present embodiment, since it is known that the vehicle has passed the intersections (1) to (12) and the time is also known, simple map matching on the digital map is performed. This makes it possible to completely reproduce the traveling locus.

Further, for example, when the distance from the position (1) to the position (12) is 10 km and the GPS using the artificial satellite having no landmark information as in the past is used, the displacement of the position information in a short cycle is obtained. Is required, for example, position information is required every two seconds. Assuming that the average value of the traveling speed is 10 km / h, in the method according to the present embodiment, it is sufficient to have 12 sets of time and position information, whereas in the method using the conventional GPS, 10 (km) ÷ 10 (km / h). h) × 3600 (seconds / h) / 2 (seconds / information) = 1800 (information) is required.

That is, according to the present embodiment, 1/15
It can be seen that a storage capacity of 0 is sufficient. The trajectory that could be traced for only about one hour by the conventional method is expanded to 150 hours according to the present embodiment without changing the device configuration or scale. This achieves a significant increase in efficiency in logistics and traffic management.

A third embodiment of the position measuring apparatus to which the present invention is applied will be described with reference to FIGS.

Vehicle detectors having a communication function such as an optical beacon have been installed steadily, but are in a transient state until an intersection on a main road in Japan is covered, and in suburban areas and mountainous areas where there are few intersections. Is required. The present embodiment is devised so that the apparatus of the second embodiment can be used more widely. Its hardware configuration is the same as that of FIG. 2, but the processing procedure to be executed is different. The processing procedure that is a feature of the present embodiment will be described with reference to FIG.

For example, when the vehicle detection / communication device 13 is not installed at the intersection (4) as shown in FIG.
The symbol 示 し indicates the position where the vehicle detection / communication device 13 is installed.) In the device of the second embodiment,
Only the information of intersections (3) and (5) can be stored. Therefore, when there are a plurality of routes between the intersections (3) to (5), it is difficult to specify an accurate route.

Therefore, in the present embodiment, in addition to the communication timing with the vehicle detection / communication device 13, the current time of the vehicle is determined at regular intervals from the timer 3 or when there is no communication with the vehicle detection / communication device 13 for a predetermined time. The process is started to save the position, and the time and the current position at the corresponding timing are stored in the second storage device 8.

FIG. 10 shows a processing flow performed by the position determination device 4 of this embodiment.

This processing is to perform periodic activation by the timer 3 in addition to activation at the time of receiving position information shown in the flowchart of FIG. Processes A to C are the same as those in FIG. Processing D is the same processing as in FIG. In the process E, the position (x + Δx, y + Δy) obtained by adding the time fetched from the timer 3 and the autonomous traveling information is written to the second storage device 8 as the current position of the vehicle.

FIG. 5 shows an example of the configuration of the travel history information consisting of the time and the current position stored in the second storage device 8 by the above processing addition. The location names correspond to FIG. 6 above,
(I) indicates the intersection i, and <j> indicates the point where the position is written by the processing added above. Here, a point <22> is added after the intersection (3),
Next, since the information of the intersection (5) is stored, the correct trajectory (3) → (4) → (5) is correctly reproduced.

According to the present embodiment, even in a region including an intersection where the vehicle detection / communication device 13 is not installed, or in an area where the existence density of the intersection is low, the vehicle can be stored in a small storage capacity as shown in FIG. An accurate traveling locus from the starting point A to the destination B can be stored.

In the second and third embodiments, the travel locus information including the obtained current position and time is stored in the second storage device 8. However, the present invention is not limited to this. Not something. For example, a function of transmitting position information and travel locus information to a base station on the system side by using a mobile phone is added to the in-vehicle device, and every time the current position of the vehicle is acquired, or the travel locus information is stored in the second storage device. Each time the information is stored in the device 8, the current information or the running locus information of the vehicle may be transmitted to the base station.

The present invention represented by the above-described embodiments can be applied to, for example, a physical distribution and delivery system using trucks. For large carriers,
Some have more than 1,000 trucks.
If the on-board terminal of a conventional navigation device, a wireless device, a GPS device, or the like is to be mounted on each truck for the purpose of managing the positions and running trajectories of these trucks in real time, the following problems will occur. Can be

(1) In-vehicle terminal of navigation device or G
The PS device and the dedicated wireless device are expensive and require enormous capital investment.

(2) A system-side receiving facility for receiving radio communication from each truck is required, and in order to perform detailed management, a large number of communication frequencies used for radio communication are required.

(3) Many relay stations are required to cover the whole country, but it is practically difficult to cover every corner.

(4) In GPS using artificial satellites, there is a possibility that an error of several tens to several hundreds of meters may occur.

On the other hand, according to the present invention, the above problems are solved as follows. That is, the above (1) uses the infrastructure of the vehicle detection / communication device that is currently being installed and has a communication function using a beacon and the like. No significant investment is required, since only a possible position measuring device needs to be mounted on the vehicle.

In the case of the above (2), the necessity of a dedicated radio communication line can be eliminated by automatically transmitting the current position and running locus of each truck from a mobile phone or the like.

For the above (3), vehicle detection and
As long as a communication device is installed, the area can be covered regardless of its distance.

Further, with respect to the above (4), the error depends only on the accuracy of determination of the autonomous traveling detection device performed during traveling on a relatively short distance section between the vehicle detection and communication devices.
This error is generally considered to be several meters or less.

As described above, if the present invention is applied to an actual operation management system, not only is the economic burden greatly reduced, but also for users of any size without delay and accurate It is possible to manage various positions and traveling trajectories with a simple device configuration.

[0064]

According to the present invention, the following effects can be obtained with a device having a simple structure. That is, according to the present invention, (1) without using an artificial satellite radio wave,
Accurate position can be measured, (2) the accuracy of the measured position information is high, and there is no variation due to time transition and regionality,
(3) It is possible to provide a position measuring method and a system thereof capable of storing long-term traveling history information with a small storage capacity, and an in-vehicle device of the system.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a second embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating a method of displaying a current position.

FIG. 4 is an explanatory diagram showing an example of a travel history display.

FIG. 5 is an explanatory diagram showing a configuration example of travel history information.

FIG. 6 is an explanatory diagram showing another example of a travel history display.

FIG. 7 is an explanatory view showing another example of a travel history display.

FIG. 8 is a flowchart illustrating an example of a processing flow of the position measurement device.

FIG. 9 is a flowchart showing another example of the processing flow of the position measuring device.

FIG. 10 is a flowchart showing another example of the processing flow of the position measuring device.

Claims (9)

[Claims] 1. A position measuring system comprising: an on-vehicle device mounted on a vehicle running on a road; and a plurality of road-side devices installed apart from each other along the road, wherein each of the plurality of road-side devices is provided. Is a wireless communication unit, a storage unit that stores position information indicating a position of a communicable range of the wireless communication unit, and a vehicle that passes a signal including the position information stored in the storage unit and passes through the communicable range. Control means for controlling the wireless communication means so as to transmit toward the vehicle, the in-vehicle device, a receiving means for receiving a signal including position information transmitted from each of the plurality of roadside devices, and A position receiving means for extracting position information from the received signal, an autonomous traveling detection means for autonomously detecting a moving direction and a distance traveled after receiving the signal including the position information, Position measuring system for serial and received position information, and a autonomously detected subsequent moving direction and distance, wherein the upcoming comprising a position determining means for calculating a current position of the vehicle equipped with the device. 2. A position measuring system comprising an in-vehicle device mounted on a vehicle traveling on a road and a plurality of roadside devices installed apart from each other along the road, wherein each of the plurality of roadside devices is provided. Is a wireless communication unit, a storage unit that stores position information indicating a position of a communicable range of the wireless communication unit, and a vehicle that passes a signal including the position information stored in the storage unit and passes through the communicable range. Control means for controlling the wireless communication means so as to transmit toward the vehicle, the in-vehicle device, a receiving means for receiving a signal including position information transmitted from each of the plurality of roadside devices, and Position receiving means for extracting position information from the received signal; time management means for managing time; storage means for storing information relating to the traveling trajectory of the vehicle; and a signal including the position information. Every time the received position information is received, the position indicated by the extracted position information is set as the current position of the vehicle equipped with the device, and the current position and the time at that time obtained by the time management means are used as travel trajectory information. And a position determining means for storing the information in the storage means. 3. The position measuring system according to claim 2, wherein the on-vehicle device further includes an autonomous traveling detecting unit that autonomously detects a traveling direction and a traveling distance after receiving the signal including the position information. The time management unit manages time and manages whether a predetermined time has elapsed after receiving the signal including the position information, and the position determination unit further includes the time If it is determined that a predetermined time has elapsed after receiving the signal including the position information by the management means, the time at that time, and the position information received and the position information received autonomously detected A current position of the vehicle at that time calculated from the moving direction and the distance of the vehicle as travel trajectory information in the storage means. 4. The position measurement system according to claim 2, wherein the on-vehicle device further includes an autonomous traveling detection unit that autonomously detects a traveling direction and a traveling distance after receiving the signal including the position information. The time management means manages time and manages the elapse of a predetermined time, and the position determination means determines that the predetermined time has passed in addition to the operation. In this case, the time at that time, and the current position of the vehicle at that time calculated from the received position information and the moving direction and distance after receiving the position information autonomously detected, as travel locus information A position measurement system stored in the storage means. 5. The position measuring system according to claim 1, wherein the on-vehicle device includes a second storage unit for storing a road map, and a vehicle on the stored road map. Display means for superimposing and displaying the current position of the object with a predetermined symbol. 6. A position measuring method for measuring a current position of a vehicle traveling on a road, wherein signals including position information indicating the positions of the points are transmitted by radio communication from a plurality of points separated from each other along the road. Then, by the in-vehicle device equipped with a wireless communication function mounted on a vehicle passing through any of the plurality of points, to obtain the transmitted position information, the travel direction and distance traveled after obtaining the position information, A position measuring method, wherein the current position of the vehicle is autonomously detected, and the current position of the vehicle is determined from the acquired position information and the moving direction and distance autonomously detected. 7. A position measuring method for measuring a current position of a vehicle running on a road, wherein signals including position information indicating the positions of the points are transmitted by radio communication from a plurality of points separated from each other along the road. Then, the transmitted position information is acquired by an in-vehicle device equipped with a wireless communication function mounted on a vehicle passing through any of the plurality of points, and the vehicle travels through the acquired position information and the time at that time. A position measuring method characterized by storing as trajectory information. 8. An in-vehicle device of a position measuring system mounted on a vehicle running on a road and measuring a current position of the vehicle, wherein the device is transmitted from a plurality of points along the road on which the vehicle runs. Receiving means for receiving a signal including position information of the point, position receiving means for extracting position information from the received signal, and a moving direction and distance traveled after receiving the signal including the position information, Autonomous traveling detection means for autonomously detecting; a position determination for calculating a current position of a vehicle equipped with the device from the received position information and a moving direction and a distance after receiving the position information autonomously detected. Vehicle-mounted device comprising: 9. An in-vehicle device of a position measuring system mounted on a vehicle traveling on a road and measuring a current position of the vehicle, and transmitted from a plurality of points along the road on which the vehicle travels. Receiving means for receiving a signal containing position information of the point; position receiving means for extracting position information from the received signal; time managing means for managing time; and storing information on a traveling locus of the vehicle. Storage means for performing, each time a signal including the position information is received, the extracted position information is used as the current position of the vehicle equipped with the device, and the current position and the time obtained by the time management means are obtained. An on-vehicle apparatus comprising: a position determination unit that stores a time at a time point as travel locus information in the storage unit.