JP2002074591A - Position information notification device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position information notification device which enables a center system-side to grasp position information precision corresponding to the necessity of precision and communication cost to be small by informing a center system of a position based on a necessary condition by the automatic judgment of a mobile object-side. SOLUTION: The transmitting period of position information corresponding to the position where the mobile object exists is registered. The transmitting period corresponding to position information that a position information detector such as GPS detects is read. Position information of the mobile object where the device is loaded is transmitted to the center system at every transmitting period. When the mobile object is detected to be in a stop state, the transmission of position information is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system in which a center system monitors the position of a moving body and manages the operation of the moving body.

[0002]

2. Description of the Related Art In a system in which a center system grasps the position of a moving object such as a bus or a tram, and ascertains the operation status and instructs the moving object to operate, the position of a plurality of moving objects is managed. The methods are broadly divided into the following two. 1) Polling method This is a method in which a center system mainly inquires a plurality of mobile units that require position management one by one, obtains a response of position information, and collects information. Since one or a very small number of mobile units simultaneously transmit inquiries from the center system, the communication infrastructure can be simplified. However, when the number of subordinates increases,
Since the period of the cycle becomes longer and the inquiry interval per vehicle becomes wider, there is a disadvantage that the positional relationship between the moving bodies becomes inaccurate. 2) Self-sustained calling system This is a system in which the mobile side plays the main role and transmits position information to the center system at regular intervals. Although the transmission timing of each mobile unit is averaged, an almost accurate positional relationship can be grasped. However, a communication infrastructure that allows all the assumed mobile units to simultaneously make a call is required.

[0003]

As described above, in the conventional polling system, when managing the positions of a large number of mobile units, the response cycle of the position information becomes long and the position grasp becomes incomplete. In addition, the self-sustained calling system has a drawback that the communication infrastructure for calling a large number of mobiles is required, so that the cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is configured so that the position is notified to the center system under necessary conditions by automatic judgment on the moving body side. It is an object of the present invention to provide a position information notification device that can grasp the position information accuracy corresponding to the necessity of the accuracy and can reduce the communication cost.

[0005]

A position information notifying apparatus according to a first aspect of the present invention is mounted on a moving body, receives position information of the moving body detected by a position information detecting device, and transmits the position information to a communication device. A transmission cycle registering means for registering a transmission cycle of position information corresponding to a position where a moving object may exist, and a position information notifying apparatus which transmits the position information to the center system using the position information detecting apparatus. The transmission cycle registering means is searched by using the received position information, and a transmission cycle reading means for reading out a corresponding transmission cycle, and for each transmission cycle read by the transmission cycle reading means, the position information detecting means detects And a position information transmission control means for transmitting the position information of the moving object to the center system using the communication device.

According to the present invention, for example, when the present invention is applied to the operation management of a tram, when the positional relationship between the starting vehicle and the late vehicle near the stop is important, the vicinity of the stop (previously registered in the transmission cycle registration means) is used. When it is detected that the vehicle is located in the area, the location information is frequently transmitted to the center system, and if there is no problem in operation management even if the location information is transmitted in a running section with a time interval, the transmission frequency is Can be lowered. Therefore, the center system can accurately determine the position of the vehicle at points that are important for operation management, such as near a stop, and the frequency of transmission from vehicles at points that are less important for operation management decreases. Therefore, communication traffic is reduced, and communication costs can be reduced.

A position information notifying device according to a second aspect of the present invention is mounted on a moving object, receives input of position information of the moving object detected by the position information detecting device, and transmits the position information to a center system using a communication device. A position information recording device for recording position information at a previous position information notification timing, a current position information detected by the position information detection device, and a position information recording device. And the stop state determining means for determining whether the moving object is in the stopped state, and determining that the stopped state detecting means is not in the stopped state. In this case, the current position information is sent to the center system using the communication device, and if it is determined that the communication device is in a stopped state, the position information for suppressing the current position information is sent. A transmission unit, is characterized in that it has a position information rewriting means rewrites the position information recording means to the position information of the time.

According to the present invention, since positional information is not transmitted from a vehicle in a stopped state, communication traffic is reduced, and communication costs can be reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the overall configuration of the present invention.

Reference numeral 1 denotes a position information notification device. The position information is input from a position information detecting device 2 such as a GPS, and a function of transmitting the position information to the center system 4 by controlling the communication device 3 such as a mobile phone or a PHS is realized.
The position information notification device 1, the position information detection device 2, and the communication device 3 are mounted on a moving body as a set.

This position information notifying apparatus has an area table in which a transmission cycle corresponding to a position where a moving object exists is registered.
(Transmission cycle registration means) 11 and a position information recording means 12 for recording the position information transmitted last time, and a transmission time recording means for recording the time transmitted last time.

Further, a stop state determining means 14 for comparing with current position information obtained from the position information detecting device 2 to determine whether or not the vehicle is currently stopped, a position information detecting device 2
The transmission period reading unit 15, the transmission period reading unit 13, and the stop state judging unit 14 receive the transmitted position information, search the area table 11 based on the position information, and read the transmission period corresponding to the current position. Position information transmission control means 16 for controlling the notification of the current position information performed by the communication means 3 based on the control information obtained from the position information, and position information for rewriting the recorded contents of the position information recording means 12 to newly obtained position information. It has rewriting means 17.

Each of these means is specifically realized by executing a program on a computer constituting the position information notifying apparatus 1, and the program function is recorded on an exchangeable storage medium (not shown). It may be configured to be installed in a computer.

Next, the processing executed by the position information notification device will be described with reference to the flowchart of FIG.

First, when the position information detecting device 2 detects the position information of the own vehicle (S101), the stop state judging means 14 reads out the previously detected position information recorded in the position information recording means 12 and reads out the position information. (S102) The current position information is compared with the current position information (S103).

If the two are the same (or if the difference is smaller than a preset value), it is determined that the vehicle is in a stopped state, and no position information is transmitted.

If the stop state judging means 14 judges that it is not in the stop state, the transmission cycle reading means 15 searches the area table 11 and reads out which area the current position is included in (S104). The transmission period set in the corresponding area is read out and sent to the position information transmission control means 16 (S105).

The position information transmission control means 16 compares the previous transmission time recorded in the transmission time recording means 13 with the current time (obtained from a clock of a computer not shown) (S106). When it is determined that the notified transmission cycle has been reached, a process of controlling the communication device 3 and transmitting the current position information detected by the position information detecting device 1 to the center system 4 is executed (S107).
The transmission time is recorded in the transmission time recording means 13 (S10
8).

The position information rewriting means 17 rewrites the contents of the position information recording means 12 with the position information transmitted this time (S109).

FIG. 3 is an explanatory diagram for comparing the present invention with a conventional general independent calling system.

In the case of a general self-sustained calling system, the mobile unit notifies position information at regular time intervals (equivalent interval T1 from t0 to t1).

On the other hand, in this embodiment, when the moving object is located in the area A, the notification is made at intervals of T1 × 10,
It is assumed that the notification is made at intervals of T1 × 5, and the notification is made at the interval of T1 in the area C (because it is an area having a high degree of importance such as near a stop).

In this case, in the example shown in FIG. 3, if a notification is first made at t0 (each communication timing is shown by a cross in FIG. 3), no notification is made until t10, but t
Since it enters the area B at 14, it is determined that the transmission interval has reached T1 × 5 at the timing of t15, and a notification is made.

Next, at t20, since the moving object has entered the area B again, a notification is made at t25 when T1 × 10 has elapsed from t15 when the previous notification was made.

Then, since the moving object enters the area C at t34, the notification is made six times from t34 to t39.

In the above example, the notification to the center system is made at t 0, t 10, t 15, t 25, and t 34 to t 3.
9 times (t0 ≦ t <t40).

On the other hand, in the conventional general self-sustained calling system, if the notification interval is T1 within the same time, the number of notifications becomes 40 times, and communication traffic increases.

If the communication interval is set to T1 × 4, the number of notifications becomes 10 as in the example of the present invention. However, there is a transmission interval in area C which is an important position, and The position grasp becomes insufficient.

As described above, according to the present invention, it is possible to achieve both the reduction of communication traffic and the securing of the accuracy of grasping the position of a moving object existing in an important area.

[0031]

As described above, according to the position information notifying apparatus of the present invention, when a moving object is present in an important area such as near a stop, the position information is frequently transmitted to the center system, and the time interval is determined. It is possible to reduce the transmission frequency when a moving object exists in an area where there is no problem in operation management even if the location information is transmitted with a space. Therefore, the center system can accurately grasp the position of the vehicle at points that are important for operation management, and the frequency of transmission from vehicles at points that are less important for operation management decreases, so that communication traffic And communication costs can be reduced.

Further, by not configuring the location information to be sent to the center system when the mobile unit is in a stopped state, it is possible to further reduce communication traffic.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram illustrating an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a process according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating the effect of reducing the number of times of communication in the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 position information notifying device 11 area table 12 position information recording means 13 transmission time recording means 14 stop state judging means 15 transmission cycle reading means 16 position information transmission control means 17 position information rewriting means 2 position information detecting device 3 communication device 4 center system

Claims (4)

[Claims] 1. A position information notifying device mounted on a moving body, receiving position information of the moving body detected by a position information detecting device, and transmitting the position information to a center system using a communication device. A transmission cycle registration unit for registering a transmission cycle of position information corresponding to a position where a moving object may exist; and searching for the transmission cycle registration unit using the position information transmitted by the position information detection device. Transmission period reading means for reading a corresponding transmission period; and for each transmission period read by the transmission period reading means,
And a position information transmission control means for transmitting the position information of the moving object detected by the position information detection means to a center system using the communication device. 2. A position information notifying device which is mounted on a moving object, receives position information of the moving object detected by a position information detecting device, and transmits the position information to a center system using a communication device. Position information recording means for recording position information at the previous position information notification timing; current position information detected by the position information detection device; and previous position detection timing recorded in the position information recording means. A stop state determining unit that determines whether the moving object is in a stopped state by comparing the position information with the position information in the above. Sending the position information to the center system, and when it is determined that the position information is in a stopped state, the position information transmitting means for suppressing the sending of the current position information; Location information notification apparatus characterized by having a position information rewriting means rewrites the stage position information of the time. 3. A computer mounted on a moving object reads the position information of the moving object detected by a position information detecting device connected to the computer, and the position information is connected to the computer. A computer-readable storage medium storing a program for performing a process of transmitting to a center system using a communication device, wherein a transmission cycle of position information is registered corresponding to a position where a moving object may exist. A period registration table is searched using the position information sent by the position information detecting device, and a transmission period reading function for reading out a corresponding transmission period, and for each transmission period read by the transmission period reading means,
A computer-readable storage medium storing a program, comprising: a position information transmission control function of transmitting position information of a moving object detected by the position information detection means to a center system using the communication device. . 4. A computer which is mounted on a moving body, receives the position information of the moving body detected by a position information detecting device connected to the computer, and receives the position information to be connected to the computer. A computer-readable storage medium in which a program for performing a process of transmitting to a center system using a communication device is recorded, the current position information detected by the position information detecting device, and the last time stored in a computer. A stop state judging function for judging whether or not the moving object is in a stopped state by comparing the position information at the position detection timing of the communication device with the communication device. To send the current location information to the center system, and if it is determined to be in a stopped state, the transmission of the current location information is suppressed. A location information transmission function, the position information storage function of storing positional information of the current to a computer, a computer-readable storage medium characterized by storing a program having the city.