JP2544282B2 - Position confirmation system for mobiles using radio waves - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes a pager (trade name, which is called a beeper or radio pager in English) which is a small radio that calls a specific person by using a telephone line and radio. The present invention relates to a position confirmation system for a moving body (which means a person or an object) that detects the position of the moving body by transmitting and receiving radio waves.

[0002]

2. Description of the Related Art Conventionally, as a system for monitoring a person, there has been a method for monitoring a moving body through transmission and reception of a radio signal described in Japanese Patent Application Laid-Open No. 1-114127 previously proposed by the present applicant. The subject is that a person sends out a radio signal from a transmitter, receives it with a plurality of receiving systems having directional antennas, and detects the position of the transmitter by using the principle of triangulation.

[0003]

However, in the above method, in order to operate the transmitter, it is necessary for the person himself to press the transmission switch or use another radio wave to operate the transmitter. Although it is not impossible to do it with one frequency, there is a problem that basically two waves are required for calling and transmitting. On the other hand, in recent years, a pager that emits a bell sound and / or a signal light from a small radio device carried around by transmitting a radio wave having an identification code from a radio wave transmitting station by turning a specific number through a telephone line has become widespread. ing. However, this pager is for unilateral contact and it is not possible to identify the location of the person carrying the pager. The present invention has been made in view of such circumstances,
An object of the present invention is to provide a position confirmation system of a mobile body using radio waves for detecting the position of an object or a person wearing a portable wireless device by using a pager which has been conventionally used.

[0004]

A method according to the above-mentioned object.
A mobile body position confirmation system using the described radio wave includes a pager for activating a calling means via a wireless line in accordance with a tuning instruction of a telephone line, detects a signal of the calling means of the pager, and incorporates it. The GPS receiver is operated to detect its own position, and the detected own position is wirelessly reported to the central station together with its identification code.

[0005]

In the system for confirming the position of a moving body using radio waves according to claim 1, GP is transmitted by a pager signal.
Since the S receiver operates to detect its own position and sends the detected own position by radio to the central station together with its identification code, the central station knows the position of the portable radio. You can

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is a schematic block diagram of a portable wireless device used in one embodiment of the present invention, and FIG. 2 is a flow chart thereof.

A mobile body position confirmation system using radio waves according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the portable radio device 44, a GPS receiver 45 is provided inside. A control unit 46 including an internal CPU, a ROM in which a program and an identification code are described, a RAM for temporarily storing necessary information, and an interface for external connection, a receiving unit 47 connected to the control unit 46, and a transmitting unit Four
8, antenna switching unit 49, light receiving unit 50 for detecting light (or sound) of a light emitting diode which is a calling means from pager 11, alarm lamp 51 and emergency button 52.
And an antenna 53 for transmission / reception connected to the antenna switching unit 49, a battery (not shown) that supplies power to these, and a case (not shown) that houses these. The receiving unit 47 is another portable radio device 44.
In order to receive the radio wave, the radio wave signal having the same frequency as the transmission frequency of the transmitter 48 is received.

The operation of the portable radio 44 will be described with reference to FIG. 2. First, it is confirmed that the emergency button 52 is not pressed (step 150), and the signal from the pager 11 based on the instruction of the telephone line. If there is a signal from the pager 11, the GPS receiver 45 is operated and a signal is given to the antenna switching section 49 so that the transmission / reception antenna 53 is received. Switch to (Step 15
2). Here, the receiving antenna of the GPS receiver 45 and the antenna 53 are preferably separate bodies, but an appropriate distributor (duplexer) may be connected and shared if necessary.

Next, the receiving section 47 is operated to measure the electric field strength of another radio wave having the transmission frequency (step 15).
3) If the electric field strength is below a predetermined value (step 15)
4), actuating the antenna switching unit 49 to switch the antenna 53 in the transmitting direction (step 155), the transmitting unit 4
8 is activated to transmit the identification code and the received latitude and longitude signals to the GPS receiver 45 (step 156).
Here, when the latitude and longitude cannot be measured by the GPS receiver 45, the GPS receiver 45 may be put on standby until it can be measured, or a signal indicating that the GPS receiver 45 does not operate may be transmitted from the transmitter 48 together with the identification signal. good.

In step 154, when the electric field strength is equal to or higher than the constant value of the electric field strength of the frequency, the time of 1 to 3 seconds is counted (step 158), and the next timer is set to N times (N). The number of times counted is measured (step 159), and the count value N is a predetermined value (for example, 5 times).
If it exceeds (step 160), it means that the radio wave cannot be used at the present time, so the alarm lamp 51 is turned on for a certain period of time (step 161), the circuit is reset (step 157), and the process ends. To do. And
If the N value is less than the predetermined value, step 152
And repeat the above steps.

At a central station (not shown) that receives the signal from the portable radio device 44, the identification code is used to identify the portable radio device 44 from the received radio signal, and the latitude,
The position of the portable wireless device 44 is detected from the longitude signal, the position is displayed on the display together with the map information of the surroundings, and the survey requester is notified by fax when requested. This also makes it possible to omit the fixed station with a rotating directional antenna.

In the above-described embodiment, the pager 11 is provided in the portable radio device 44 by providing a storage portion (not shown), and the pager 11 is stored in the storage portion. It is theoretically possible to incorporate the portable wireless device 44 into the pager 11 and integrate the entire device. In this case, the calling signal from the pager does not need to be light, sound, etc. Therefore, in the portable wireless device, instead of the light receiving unit 50 for detecting the light of the light emitting diode shown in FIG. The input section from the pager 11 will be provided. As a result, the overall structure can be simplified. Further, in the above embodiments, the antennas provided in the portable wireless device may protrude from the portable wireless device, or a known small antenna (for example, a loop antenna or a shortened rod antenna) may be used. It is also possible to incorporate the antenna. Further, the present invention is applicable even when an antenna having a slight directivity is used as the portable wireless device.

[0013]

According to the position confirmation system for a moving body using radio waves according to the first aspect of the present invention, by carrying or mounting a portable radio on a person or an object, a pager is activated from the outside through a telephone line. The position can be detected. And since the conventional pager is effectively used, the function as a pager is natural,
Since the position of a person or an object carrying the pager can be detected, effective use of radio waves is promoted and the device can be simplified. Further, it is not necessary to provide a radio wave direction detecting means for detecting the propagation direction of the radio wave from the portable radio device, and the overall system can be simplified.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a portable wireless device used in an embodiment of the present invention.

FIG. 2 is a flowchart of the same.

[Explanation of symbols]

11 pager 44 portable radio 45 GPS receiver 46 control unit 47 reception unit 48 transmission unit 49 antenna switching unit 50 light receiving unit 51 alarm lamp 52 emergency button 53 antenna

Claims (1)

(57) [Claims] 1. A pager for activating a calling means via a wireless line in response to an instruction to select a telephone line, detecting a signal from the calling means of the pager, and activating a built-in GPS receiver. A position confirmation system for a mobile body using radio waves, which detects the position of the mobile station and informs the detected central position by radio together with its identification code.