JP3263686B2 - Emergency call device for mobile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile body emergency notification device, and more particularly to an emergency notification device for transmitting a current position to a center when an emergency such as an accident occurs.

[0002]

2. Description of the Related Art An emergency notification device for a mobile body is mounted on a vehicle or carried by a person, and in an emergency such as an accident or sudden illness, informs an emergency notification center of an accident occurrence position and requests for rescue. Device. An example of a conventional emergency call system is disclosed in Japanese Patent Application Laid-Open No. H11-167693.
In the conventional emergency notification system shown in FIG. 5, when a moving user encounters some kind of emergency such as an accident, the user transmits information for specifying the position to the center. The center performs map matching as necessary based on the received position information, and displays the position where an emergency has occurred along with occupant information and the like.

[0003] In an emergency call, an estimated error amount is generally attached to each position data and transmitted.
When the absolute position is obtained by GPS or the like, the position error estimation amount or the physical amount (HDOP or the like) from which the error can be estimated
Send Based on the position error information, the center determines the range of the emergency occurrence position.

[0004]

However, in the above-mentioned conventional emergency call system, since only the position information is transmitted at regular time intervals, a large number of the same position data are transmitted even when the position data is unchanged, such as when the vehicle is stopped. Therefore, there has been a problem that the data transfer time becomes long. In particular, when map matching is performed at the center, there has been a problem that the position calculation accuracy may be significantly reduced depending on the number of position data transferred to the center by the mobile body emergency notification device.

In a tunnel or a valley of a building,
There is a problem that it is difficult to determine the position by GPS and its error, which hinders the calculation of the position at the center.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to efficiently accumulate position data of a mobile unit and transmit the position data to an emergency call center in an emergency in a short time.

[0007]

In order to solve the above-mentioned problems, according to the present invention, an emergency notification device for a mobile unit is used to determine the absolute position, traveling direction and moving speed of the mobile unit based on information from an external device. Positioning data output means for obtaining and outputting positioning data, and storing positioning data based on changes in traveling direction, absolute position, and moving speed since the last time positioning data was stored, and elapsed time and errors in traveling direction and absolute position. A configuration is provided that includes positioning data storage means for storing positioning data in an internal memory in accordance with the determination of availability, and data transmission means for transmitting the stored positioning data to the center in an emergency.

[0008] With this configuration, it is possible to efficiently accumulate the position data of the moving body and transmit necessary data to the emergency call center in a short time in an emergency.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to FIGS.

(Embodiment) An embodiment of the present invention relates to a G
Obtain the absolute position, traveling direction and moving speed of the moving object by PS,
Based on the change of the heading, the absolute position, and the moving speed since the last time the positioning data was stored, the elapsed time, the error of the heading, and the absolute position, it is determined whether or not the positioning data can be stored. This is a mobile body emergency notification device that is sometimes transmitted to an emergency notification center.

FIG. 1 is a functional block diagram of a mobile emergency notification device according to an embodiment of the present invention. In FIG. 1, a positioning data output device 1 is a positioning device such as a GPS / beacon. The positioning data storage device 2 is an arithmetic storage device such as a CPU / memory. The data transmission device 3 is a wireless communication device such as a mobile phone.

FIG. 2 is a functional block diagram of a positioning data storage device of the mobile emergency notification device. In FIG. 2, a change detecting device 21 is a device that detects a change in a traveling azimuth, an absolute position, or a moving speed. The error detection device 22 is a device that detects an error in the traveling azimuth or the absolute position. The storage availability determination device 23 is a device that determines availability based on a change in positioning data and an error.

FIG. 3 is an explanatory diagram of a method for determining whether or not accumulation is possible based on the amount of change in the heading and the amount of error in the heading before and after the change in the embodiment of the present invention. FIG. 4 is an explanatory diagram of a method of determining whether or not accumulation is possible based on a change in the absolute position and an error amount of the absolute position before and after the change in the embodiment of the present invention.

The operation of the mobile emergency notification device according to the embodiment of the present invention configured as described above will be described. FIG.
Is a GPS receiver,
The traveling direction and the moving speed of the moving object are calculated using the Doppler frequency shift in addition to the normal positioning operation. position·
The method of calculating the azimuth and speed is the same as that of a GPS receiver for in-vehicle navigation and the like, and a description thereof will be omitted.

The GPS receiver of the positioning data output device 1 periodically measures the position, direction, and speed once a second, for example, once a second, and stores the obtained positioning data in the positioning data storage device 2.
Transfer to The change detection device 21 and the error detection device 22 of the positioning data storage device 2 shown in FIG. The storage availability determination device 23 determines whether the following conditions 1 to 4 are satisfied. Condition 1: The amount of change in the traveling azimuth since the last time the positioning data was stored is equal to or greater than a specified value. Condition 2: The elapsed time from the time when the positioning data was accumulated last time is equal to or more than a certain value. Condition 3: The change amount (linear distance) of the absolute position since the last time the positioning data was accumulated is equal to or greater than a certain value. Condition 4: The difference between the moving speed at the time of storing the previous positioning data and the current moving speed is equal to or more than a certain value.

If it is determined that the predetermined combination of the conditions 1 to 4 has been established, the positioning data storage device 2 stores the received data in a storage area on the memory. Conditions 1-4
Selects and uses an optimal combination according to the position calculation method at the center. For example, "Distance 100 since the last accumulation
m or more, and the azimuth has changed by 30 degrees or more. " The specified value or the specified distance in the conditions 1 to 4 may be changed by software or the like. By combining these processes, it is possible to accumulate positioning data under appropriate conditions, so that time / capacity-efficient data can be transmitted to the center.

When the condition 1 is considered, unnecessary data can be omitted by not storing the same data in an error range. When the azimuth output from the positioning data output device 1 has an error distribution like a GPS receiver, as shown in FIG. 3, a region where the previous azimuth (θpre) can take a value (between θpremin and θpremax). , The area where the current azimuth (θnow) can take as a value (θnowmin and θnowma
If x) has an overlapping portion, condition 1 is not satisfied.

When the condition 3 is considered, unnecessary data can be omitted by not storing the same data in an error range. When the position output by the positioning data output device 1 has an error distribution like a GPS receiver,
As shown in FIG. 4, the output position (Ppre) and the distribution area (Dpre) at the time when the previous position / azimuth data was accumulated are shown.
And the current output position (Pnow) and its distribution area (Dno)
The condition 3 is satisfied only when w) has no overlapping part.

By accumulating the positioning data at the time of the speed change in consideration of the condition 4, the positioning data can be accumulated at the intersection or the start point and the end point of the tunnel. Positioning data output device 1 is G
In the case of the PS receiver, even when the reception frequency is reduced due to a building, a tunnel, or the like, the positioning data can be stored immediately before and immediately after the point where reception is impossible, and necessary data can be efficiently transferred.

As described above, in the embodiment of the present invention,
The mobile emergency notification device obtains the absolute position, traveling direction, and moving speed of the moving object by GPS, and changes in the traveling direction, the absolute position, the moving speed, the elapsed time, the traveling direction, and the like since the last time the positioning data was stored. Based on the absolute position error, it is determined whether or not the positioning data can be stored, stored in the internal memory, and sent to the emergency call center in case of emergency. Necessary data can be transmitted to the emergency call center in a short time.

[0021]

As is apparent from the above description, according to the present invention, the mobile emergency notification device determines the absolute position, the traveling direction, and the moving speed of the mobile object based on information from an external device to obtain positioning data. According to the determination of whether or not the positioning data can be stored based on the change of the traveling direction, the absolute position, and the moving speed since the last time the positioning data was accumulated, and the elapsed time and the error of the traveling direction and the absolute position, as the positioning data output means that outputs the positioning data. Positioning data storage means for storing positioning data in an internal memory;
A data transmission means for transmitting the stored positioning data to the center in an emergency is provided, so that the position data of the moving object can be efficiently stored and the necessary data can be transmitted to the emergency call center in a short time in an emergency. The effect that it can be obtained is obtained.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a mobile body emergency notification device according to an embodiment of the present invention;

FIG. 2 is a functional block diagram of a positioning data storage device of the mobile body emergency notification device according to the embodiment of the present invention;

FIG. 3 is an explanatory diagram of a method for determining whether or not accumulation is possible based on a change amount of the traveling direction and an error amount of the traveling direction before and after the change in the embodiment of the present invention;

FIG. 4 is an explanatory diagram of a method of determining whether or not accumulation is possible based on a change in the absolute position and an error amount of the absolute position before and after the change in the embodiment of the present invention;

FIG. 5 is a functional block diagram of a conventional emergency call system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 positioning data output device 2 positioning data storage device 3 data transmission device 21 change detection device 22 error detection device 23 storage availability determination device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-10-227651 (JP, A) JP-A-10-253369 (JP, A) JP-A-5-19036 (JP, A) JP-A-9-95 106499 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G08G 1/00 G08B 25/00 510 G08B 25/10 G08G 1/09

Claims (4)

(57) [Claims] 1. A and positioning data output means for outputting as the positioning data based on the information from the external device obtains the absolute position and travel direction and moving speed of the moving body, 蓄 the positioning data
Storing means for storing the positioning data in the storing means;
Accumulation determination performed based on the determination of whether the product to the error in the traveling direction position <br/> changes and advances whereabouts position from the last time accumulated
And a data transmitting means for transmitting the positioning data stored in the positioning data storage means to a center in an emergency. Wherein said storage determination means, and Turkey be determined not accumulate positioning data if the the error range of the error range and the current heading of the traveling direction at the time of previous positioning data storage overlapping The mobile body emergency notification device according to claim 1, wherein 3. A mobile unit based on information from an external device.
Obtain absolute position, heading and moving speed and use them as positioning data
Means for outputting positioning data, and storing the positioning data.
Storing means for storing the positioning data in the storing means;
Absolute position from the previous accumulation of whether to accumulate
Of storage possibility based on the change of the position and the error of the absolute position
Means, and the positioning stored in the positioning data storage means
Data transmission means for transmitting data to the center in case of emergency
An emergency notification device for a mobile object, comprising: 4. The apparatus according to claim 1, wherein said storage availability determining means includes a previous positioning data.
Error range of the absolute position and the
If the difference range overlaps, it is determined that positioning data will not be accumulated.
4. The transfer according to claim 3, further comprising:
An alert device for moving objects.