JPS61277234A - Position detector - Google Patents

Abstract

PURPOSE:To grasp the position where a moving person exists and information of his state by a central device by relaying radio waves with a vehicle provided with a position detecting function. CONSTITUTION:If the person who carries a portable transmitter with him depresses a push button of no abnormality when moving apart from the vehicle, the signal is transmitted from a code receiver 3 to a radio equipment 1, and position information is transmitted from a locator 2 by the signal from the code receiver then. These information signals are received by a radio equipment 4 of a central device (a) and are processed in a central processing unit 5, and indication of said person who carries the portable transmitter (a), no abnormally, and his position are displayed on a corresponding display map on a CRT. If his state is abnormal, he depresses a push-button of abnormality occurrence. Thus, a monitor can grasp the position where said person exists and his state.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a position detection device configured so that a central device can grasp the location of a moving person by wirelessly relaying the information using a vehicle equipped with a location detection function. related to.

[Background technology and problems] Recently, the Ministry of Posts and Telecommunications announced a concept for a "small zone communication base shared use system." The configuration of this system is
In addition to setting up large-scale radio spectrum sharing centers in large cities, the target area is divided into small zones with a radius of about 250 to 500 meters, and wireless relay stations are set up in each zone, allowing users to use small information gathering terminals or mobile phones. It is configured to send information to the corresponding recipient using a terminal device via the wireless relay base Nomi Wave Joint Usage Center. 11
clarification, display of bus location at bus stops,
It is also said to be used to confirm the location of police patrol cars.

In the above-mentioned system, in order to know the location of a moving person, which is the purpose of the present invention which will be explained in detail later, it is necessary to establish a wireless relay base in a small zone (also known as a small zone where a person carrying a portable transmitter is located). It is assumed that there is
Otherwise, a high-power portable transmitter would be required, defeating the purpose of carrying a portable transmitter for position detection. From this point of view, it is urgently necessary to divide the area into small zones and install a large number of wireless relay stations over a wide area.

On the other hand, the location system for vehicles has already been established.
The situation is changing. Some of these systems, as described in Japanese Patent Publication No. 54-11878, are capable of collecting and processing information such as the identification of each specific vehicle, its current position, and the time of passage of a specific point in a central device. Rather than a position detection method in which ground receivers are installed at intervals along specific routes as shown, and each time a vehicle passes, the signals are sent to a central device and monitored by the corresponding monitoring department, Autonomous locators that can recognize the current location of a vehicle are being put into practical use.

In the above-mentioned system in which a wireless relay base is installed in each small zone of the target area, the location of the wireless relay base itself sends information to the central device via this wireless relay base. This will provide location information for the salesperson. However, as already explained, this cannot be done if there is no wireless relay base.

[Objects and Structure of the Invention] The present invention has been made for the purpose of ascertaining the location and status information of a moving person in a central device by wirelessly relaying the information using a vehicle equipped with a position detection function. This applies to police officers on patrol in patrol cars, salesmen in commercial vehicles, and people with chronic illnesses traveling in private cars.

As mentioned above, vehicles are now being equipped with autonomous locators, which can transmit the vehicle's location to a central system, allowing surveillance responders to know the vehicle's location. In the invention, a code receiver is added as an on-board device, and in combination with a portable transmitter that can transmit the carrier's unique number and status information, the code receiver and locator installed as an on-board device are combined. The personal number and status information of the person carrying the portable transmitter, as well as the location information from the locator, are organized, sent via radio to the central device, processed by the central device, understood by the corresponding monitoring department, and dealt with accordingly. It is configured so that it can be done.

The present invention will be explained below with reference to an embodiment shown in FIG.

In the figure, C is a portable transmitter. This transmitter is configured so that it can transmit a simple encoded signal indicating the number and status of the vehicle, such as no abnormality or tracking status, using a button switch, and has a reception range of about 400 meters or less.

Reference numeral 6 denotes an on-board device, and this on-board device 6 includes at least a radio 1, a locator 2, and a code receiver 3 for receiving information from the portable transmitter C. Further, 6 indicates a data terminal, which is used separately.

The positional information from the locator 2 is divided into squares of 300 m on each side on a map, and addresses are assigned to the squares, so that the addresses can be transmitted at all times depending on the vehicle position on the map.

^ is a central unit, which consists of a radio device 4 and a central processing unit 5.

If the person carrying the portable transmitter is moving away from the vehicle,
When the button indicating no abnormality is pressed, the signal is transmitted from the code receiver 3 from the radio 1, and at this time, position information is also sent from the locator 2 by the signal from the code receiver 3. These information signals are received by the radio device 4 of the central device 4 and processed in the central processing device 5, for example, C
The person carrying the portable transmitter 4 is displayed on the RT, there is no abnormality, and the location is shown on the corresponding display map. If the wearer experiences an abnormality, all they have to do is press the abnormality button.

FIGS. 2 and 3 show a plurality of vehicles X1Y equipped with the on-vehicle device with respect to the position of the carrier, that is, the portable transmitter C.
12 is an explanatory diagram of signal transmission when the portable transmitter C is located in the inner and outer areas where the signal can reach.

In Fig. 2, when vehicles X and Z are within the signal reach area indicated by radius r centered on portable transmitter C, and Y is outside the area, the signal from portable transmitter C reaches vehicle X1z, and this As described above, transmission is performed from the vehicle X1z to the central device 4.

Figure 3 draws a circle with radius r centered around car v4 From the Wt4 side, since the transmissions from both vehicles X1z include the position information of each vehicle, it can be ascertained that the person carrying the portable transmitter C is located in that area. If there is only vehicle X, it will naturally be located within a circle with radius r centered on vehicle X.

However, in reality, the reception area is not circular, so if the reception area is made narrow and the distortion of the reception pattern is taken into consideration in advance, the location estimation of the portable transmitter can be limited to a certain range.

When an abnormality or emergency situation is detected, the system is equipped with a function that can detect the rate of change in the reception level of the code receiver as the vehicle moves, and by moving to a higher level, the area is narrowed and the portable transmitter is located. You can get close.

In the present invention, the signal transmitted from the portable transmitter includes a unique number and status information, for example, for a patrol car, information such as normal, abnormal, tracking, SO5@, for a commercial vehicle, information such as good transaction, shortage of goods, etc. For chronically ill patients, this includes information such as arrhythmia, alighting and resting, SO8, etc. The signals sent from the on-board device to the central device include the individual number, status information, vehicle number, vehicle status information, and vehicle information from the portable transmitter. This is location information.

In addition, the vehicle number and vehicle condition of each vehicle itself! ! ! Information and vehicle position information can be constantly collected from the central Hrl by polling.

[Effect] Since a vehicle with a locator is separately prepared as a vehicle location system, the present invention can monitor the location and condition of a person by simply adding a simple portable transmitter and a corresponding code receiver to the vehicle. This allows the person to understand the situation and promptly take appropriate measures accordingly.

[Brief explanation of drawings]

FIG. 1 shows the device of the invention in a block diagram. FIGS. 2 and 3 are explanatory views of signal reception from the portable transmitter and transmission from the on-vehicle radio based on the positional relationship between the portable transmitter and the vehicle. ^... Central device, Name... On-vehicle device, C... Portable transmitter, 1, 4... Radio device, 2... Locator,
3... Code receiver, 5... Central processing unit, 6...
data terminal. ] Figure 1-ゝ-1--11・0 7'-11111'

Claims (3)

[Claims] (1) A central unit consisting of a central processing unit and a radio device,
An on-board device consisting of a locator, code receiver, and radio,
A portable transmitter is provided, and the signal transmitted from the portable transmitter is received by the code receiver, and sent together with the position signal of the on-vehicle device detected by the locator to the central device via a wireless line. A position detection device characterized in that the area where the portable transmitter exists is estimated based on the number of each on-vehicle device receiving the signal transmitted by the portable transmitter and the position signal of each device. (2) The transmission signal of the portable transmitter is composed of a unique number and status information, and the central processing unit monitors abnormalities of the owner of the portable transmitter.
The position detection device described in Section 1. (3) The code receiver is equipped with a function to detect the rate of change in the reception level, and when the on-board device moves, it moves in the direction where the reception level increases, thereby narrowing the estimated existence area of the portable transmitter. A position detection device according to claim 1.