JPS5929012B2 - Mobile location information notification system - Google Patents

Abstract

PURPOSE:To send sure information on the position of a mobile station to a base station, by transmitting position information set manually at the mobile station in a sign-post uninstalled area, or position information on a fixed sign post in a sign-post installed area to the base station. CONSTITUTION:A mobile station 10 has a sign-post receiver 14 capable of receiving fixed position information set at a fixed point, and a position setting unit 15 which sends a manually set variable position information signal. While characteristic position information from a fixed sign post 30 is received, its signal Z' is sent to a changeover switch 18 and when not, a variable position information signal Y from the unit 15 is sent to the switch 18 automatically. This signal Z' or Y' is transmitted to a base station 20 by a radio equipment 13 through a data transmission part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mobile body position information notification system such as an AVM (Automatic Vehicle Position Display) system.

At present, the AVM systems applied to taxi dispatch management at dispatch centers, etc., do not use sign posts, as shown in Figure 1 a, and fixed sign posts 31, 32, etc., as shown in Fig. 1 b, are used.・It is broadly divided into methods that use The signposts 31 and 32 are small transmitters that are distributed in a certain range, for example on utility poles, and transmit unique position information signals Z (ZA, ZB... are signals that distinguish between each other, such as unique position information) indicating their set positions. FSK containing different numerical information for each
signal) is constantly transmitted. The system shown in Figure 1a is a system in which this signpost has not yet been installed, so
A variable position information signal Y is output by manually selecting one of a number of switches on a position setting switch panel 11 of a mobile station (taxi) 10 to indicate the current position. The characteristic of this signal Y is that it contains unique position information, so basically it is similar to the signal Z.
It's no different. When the data sending unit 12 assigns a unique mobile station number to this signal Y and transmits it from the radio 13, the signal X received by the radio 21 of the base station (dispatch center) 20
includes the mobile station number and its location information signal Y, so
These can be displayed in association with each other on the display device 22. On the other hand, in the system shown in FIG. A mobile station number is attached to the output Z by the data transmitter 12, and the number is transmitted from the radio 13.

This is convenient in that the taxi driver can sequentially transmit location information without having to perform any operations while driving, but if the taxi driver enters an area where no sign post is installed, location information cannot be transmitted, so the usable range is limited. It has the disadvantage of being limited. In this respect, the method shown in Fig. 1a is not limited in its range of use, but considering that automation through the installation of sign posts will gradually progress, the position setting switch panel 11 must be switched to the sign post receiver 14 one after another. First, this is complicated because it involves changing the wiring connections.

The present invention attempts to solve the above-mentioned problems all at once, and is characterized by a location information reporting system that transmits location information of a mobile object to a base station via a wireless line, in which the mobile object: a sign post receiver capable of receiving unique position information from a fixed sign post installed at a fixed point; a position setting unit that transmits a manually set variable position information signal; and a radio that automatically transmits the variable location information signal to the base station when the fixed location information signal is not being received.

This will be explained in detail below with reference to illustrated embodiments. 2 to 4 show different embodiments of the present invention, and the same parts as in FIG. 1 are given the same reference numerals.

The mobile station 10 of the invention has a sign post receiver 14 as in FIG. 1b and also has a position setting unit 15.
In the case of FIG. 2, this position setting unit 15 is the position setting switch board 11 of FIG. 1a, and in the case of FIG. It consists of a sign post 16 and a second sign post receiver 17. The operations will be explained below in order. In the example shown in FIG. 2, the manually set variable position information signal Y from the position setting unit port 5 is always guided to the changeover switch 18, and the output of the sign post receiver 14 is also guided to the changeover switch 18.

The changeover switch 18 uses the detection signal 1 sent when the sign post receiver 14 receives and detects the unique position information signal Z from the fixed sign post 30 to
4, and therefore the unique position information signal Z, to the data sending unit 1.
Switch to give 2. Conversely, if there is no detection signal 7, the variable position information signal Y from the position setting unit port 5 is guided to the data sending section 12 through the changeover switch 18. Therefore, in areas where no sign posts are installed, the variable position information signal Y from the position setting unit 15 is sent to the base station 20, but when entering the sign post installation area, the change is automatically made and the variable position information signal Y is sent from the fixed sign post 30 to the base station 20. The unique location information signal Z is preferentially sent to the base station 20 via the mobile station 10. In either case, the point that the mobile station number is assigned by the data sending unit 12 is the same as in FIG. The position information to be sent is from the sign post receiver output Z to the position setting unit output Y.
The fact that the output position has been switched to output Z is preferably indicated by a lamp, etc. If this is done, the driver will know that the output position information has changed from output Z to output Y when the lamp lights up, and the position setting unit 15 will be able to indicate the current position setting unit 15. You can check that it is properly aligned and make corrections if necessary. Third
In the figure, the position setting unit 15 is a portable sign post 16.

This portable signpost port 6 is a small wireless transmitter that transmits different position information signals Y over a narrow range (for example, several meters range) by manual operation, and its output is received by the signpost receiver 14 in the same mobile station 10. be done. The receiver 14 is originally intended to receive the unique position information signal Z from the external fixed sign post 30, but since it cannot receive the signal Z in an area where no sign post is installed, it automatically receives the unique position information signal Z from the portable sign post 16.
A variable position information signal Y is sent to the base station 20 via the receiver 14, the data transmitter 12, and the radio 13. On the other hand, in the sign post installation area, there are 30 fixed sign posts.
Since the unique location information signal Z can be received from the base station 20, it is sent to the base station 20 with priority. The following several methods can be used for this automatic switching.

One is to intermittent the output of the portable sign pos port 6 every 1 block length (for example, 255 ms) of the position information Y, and to
Transmit at a higher level than the received level.

Signal Z from the outside is received continuously, but high-level signal Y is extracted during the time period overlapping with signal Y, so in the end, signals Y and Z arrive at the input of the receiver 14 alternately on a block-by-block basis. is equivalent to . In such a situation, if the receiver 14 is equipped with a function to select a low-level external signal Z in advance, the unique position information signal Z will be captured in the sign post installation area, and the sign post will In areas where there is no sign post 15, position information Y from the portable sign post 15 is taken in.

Although these pieces of information Y and Z are intermittent, if the mobile station 10 or base station 20 detects the signal Y or Z even in one block, if it is retained, there will be no problem due to intermittent reception. Another method is to cause the portable sign post 16 to continuously transmit a weak output close to the lowest level receivable by the receiver 14. In this way, the receiver 14 receives and outputs the higher level of the signals Y and Z, so the signal Y is sent to the base station 20 in areas where no sign posts are installed, and the signal Z is sent to the base station 20 in areas where sign posts are installed. It will be done. Of course, the portable sign post 16 may be activated when the reception level from the fixed sign post 30 in the sign post receiver 14 falls below a predetermined value. In this case, appropriate means are taken to distinguish each signal from the signposts 30 and 15, such as giving them a frequency difference. In the example shown in FIG. 4, the position setting unit 15 is composed of a portable sign post 16 that transmits intermittently and a second sign post receiver 17 that receives the signal Z from the fixed sign post 30 during the period when the output is interrupted. be.

If the sign post receivers 14 and 17 have the same performance, if the receiver 14 becomes unable to receive radio waves from the fixed sign post 30, the same applies to the receiver 17, and in this case, the portable sign post 16 is activated. By doing so, the automatic switching described above can be easily performed. In this case, if the antenna of the sign post receiver 17 is made so that it is difficult to receive radio waves from the portable sign post 16, there is no need to take measures such as providing the frequency difference as described above. As described above, according to the present invention, position information manually set by a mobile station is used in areas where no sign posts are installed, and position information is reliably set from fixed sign posts without mistakes that may occur due to manual settings in areas where sign posts are installed. Position information is preferentially transmitted to the base station, and reliable position information reporting can be performed without restricting the movement range of the mobile station and while fully utilizing the advantages of signposts installed outside.

[Brief explanation of drawings]

1A and 1B are block diagrams showing different conventional AVM systems, and FIGS. 2 to 4 are block diagrams showing different embodiments of the present invention. In the figure, 10 is a mobile station, 13 is its radio, 14 is a sign post receiver, 15 is a position setting unit, 20 is a base station, and 30 is a fixed sign post.

Claims (1)

[Claims] 1 In a location information reporting system that transmits location information of a mobile object to a base station via a wireless line, the mobile object is equipped with a sign post receiver capable of receiving unique position information from a fixed sign post installed at a fixed point. and a positioning unit that transmits a manually set variable positioning signal while said unique positioning signal is being received and automatically when said fixed positioning signal is not being received. A location information reporting system for a mobile body, comprising: a radio device that transmits the variable location information signal to the base station.