JPH0423316B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention can be used to solve problems such as traffic accidents, kidnappings, wandering problems of elderly people with dementia, etc. based on emergency signals.
This is a wide-area rescue system that detects and responds to the scene of theft during cash transportation, etc., and is particularly effective in detecting multiple emergency signal sources in a short period of time, even in areas with a lot of radio wave reflection, such as urban areas with many high-rise buildings. Concerning a wide area rescue system for exploration.

(Prior technology) As a radio direction finder to search for radio wave sources,
An all-Tr portable radio direction measuring device is publicly known ("Radio and Experiment" August 1968 issue). This radio direction measuring device rotates a directional antenna and measures the reception direction of radio waves based on the orientation of the antenna.

On the other hand, as part of fire prevention and crime prevention and security systems, devices are known that deal with abnormal situations by deploying response vehicles in specific security areas (Special Publications No. 62-
Publication No. 26080). This device facilitates the discovery of a subscriber's house by a response worker heading to the subscriber's house, and the subscriber's house is connected in advance to a monitoring station via a communication line. Then, in response to a guidance signal sent from the monitoring station, a response vehicle with a response person on board rushes to the subscriber's home.

(Problem to be solved by the invention) However, when trying to measure the source of radio waves using a conventional radio direction finder, the radio waves are reflected by buildings, etc. The reality is that it is extremely difficult to accurately measure the source.

Furthermore, when a conventional radio direction finder receives multiple radio waves simultaneously, it becomes even more difficult to measure the source of each radio wave. However, when it comes to rescue systems that guarantee the safety of a large number of customers,
It is expected that emergency signals will be sent one after another from different sources. Moreover, it is expected that each emergency signal will be received in a mixed state, such as those transmitted from moving objects and those emitted from unspecified stationary positions.
It can be said that it is extremely difficult to measure an unspecified number of emergency signals in a short period of time.

On the other hand, the conventional crime prevention security system uses a guidance device for guiding a security vehicle to allow a security guard who approaches the vicinity of a subscriber's house to easily confirm the subscriber's house. Therefore, the system is completely unable to deal with cases where the signal source is not at a predetermined location, such as at the scene of a traffic accident, kidnapping incident, or theft incident during cash transportation. .

Therefore, the present invention was created in view of the above-mentioned problems, and it detects the emergency signal transmission position extremely accurately even in places where there are many reflections of radio waves. The objective is to provide a wide area rescue system that can search for emergency signal sources in a short time.

(Means for Solving the Problems) In order to achieve the above-mentioned objects, the present invention provides a wide area rescue system having a base station 1, a headquarters station 2, a transmitter 4, and a mobile receiver 7, which includes: a base station 1; The station 1 and the headquarters station 2 can communicate with each other, and each base station 1 is installed at a predetermined location and has an omnidirectional antenna 101, a directional antenna 102, and a sub-memory receiving device 116. sexual antenna 1
When 01 receives an emergency signal, the directional antenna 102 automatically rotates 360 degrees horizontally to measure the transmission direction of the emergency signal, and during the measurement, the omnidirectional antenna 101 receives another emergency signal. Sometimes, the sub-memory receiving device 116 stores the other emergency signals, and the headquarters station 2 processes the data of the emergency signal transmission direction measured by each base station 1 to determine the location of the source of the emergency signal. The transmitter 4 is mounted on a vehicle or carried by an individual, and transmits an emergency signal in the event of an emergency. The machine 7 is removably mounted on the emergency vehicle 3, and its purpose is to identify the exact location of the source of the emergency signal when the emergency vehicle 3 approaches the source of the emergency signal searched by the headquarters 2. .

The headquarters station 2 also has an antenna unit 20, receives the emergency signal, measures its transmission direction, and compares it with the measurement data of the transmission direction obtained from the base station 1. In other words, according to the first means of the present invention, the emergency signal emitted from the transmitter 4 is: The signal is caught by the omnidirectional antenna 101 of the base station 1, and then the directional antenna 102 is activated to measure the direction of the signal source. At this time, the base station 1 transmits the directional antenna 1
If another emergency signal is caught by the omnidirectional antenna 101 during operation of 02, the emergency signal is temporarily stored in the sub-memory receiving device 116, and after the operation of the directional antenna 102 is completed, it is stored in the sub-memory receiving device 116. The memorized direction of the emergency signal is measured again. Then, the headquarters station 2 detects the source based on azimuth data measured by a plurality of base stations 1 at different locations.

Then, the mobile receiver 7 searches for the exact signal source in the area detected by the head office 2.

In addition, the headquarters station 2 that receives the direction data from each base station 1 obtains the direction data of the emergency signal using the antenna unit 20 unique to the headquarters station 2, and then combines the direction data of each base station 1 with the direction data of the headquarters station 2. Compare the azimuth data unique to station 2 and determine the direction of other base stations 1 adjacent to each base station 1.
When the base station 1 is not operating, the base station 1 is commanded to operate the directional antenna 102 to further increase the amount of data from each base station 1 and improve the accuracy of detecting emergency signals.

(Example) Examples of the present invention will be described in detail below.

The present invention includes a transmitter 4 that transmits an emergency signal, a plurality of base stations 1 provided with an antenna unit 0 that receives the emergency signal and measures the transmission direction, and transmits the emergency signal from the direction data of the base station 1. This system consists of a headquarters station 2 that detects the signal source, and a mobile receiver 7 that searches for the exact signal source in the detection area of the headquarters station 2.

The transmitter 4 is mounted on a vehicle or carried by an individual, and transmits a specific emergency signal automatically, manually, or by remote control when an abnormal situation occurs. Then, this emergency signal is caught by an antenna section 10 provided in the base station 1, and the direction of transmission is measured.

The base station 1 is capable of communicating with the headquarters station 2 and is installed at various predetermined locations. This base station 1 includes an antenna section 10 equipped with two types of antennas, and a receiving section 1.
1 and a sub-memory receiving device 116 (see FIG. 3).

The antenna unit 10 uses a combination of an omnidirectional antenna 101 and a directional antenna 102, and normally the omnidirectional antenna 101 is provided with a wider area for reception. And omnidirectional antenna 1
When 01 receives an emergency signal, the rotation control device 103 attached to the antenna unit 10 rotates and horizontally rotates the directional antenna 102 by 360 degrees.
The antenna is switched from the omnidirectional antenna 101 to the directional antenna 102 by the antenna switch 111 of the receiver 11. Directional antenna 102 rotated once
The azimuth angle at which the maximum received signal was received during that period is confirmed by the receiving device 112, memory circuit 113, and comparison circuit 114 of the receiving section 11, and the
5. Direction data is sent to the headquarters station 2 via the communication line.

The sub-memory receiving device 116 includes the directional antenna 102, the rotation control device 103, and the receiving device 11.
2. When the storage device 113, comparison circuit, etc. are activated, other emergency signals can be captured. This sub-memory receiving device 116 is configured such that an emergency signal is sent from the omnidirectional antenna 101 to the sub-memory receiving device 116 even while the directional antenna 102 is rotating. Next, measure the direction of the source. Then, while the directional antenna 102 is rotating, the emergency signal received by the sub-memory receiving device 116 is checked for an identification code included in the signal, and a signal with the same code as the previously received signal is canceled, and a new signal is generated. If an emergency signal is detected, the headquarters station 2
Direction data is sent to.

The headquarters station 2 processes the data of the emergency signal transmission direction measured by each base station 1, searches for the location of the source of the emergency signal, and issues a dispatch command signal to the emergency vehicle 3. That is, the headquarters station 2 separates the radio waves sent from the base station 1 using the digital code encoder 221 and the digital code data bank 222, and extracts necessary information such as the caller's name, address, blood type, and emergency contact information. At the same time, this data is stored in the memory disk 224 (fourth
(see figure). Furthermore, this data is sent to the printer 225
It is printed out and displayed on the CRT226.

On the other hand, the headquarters station 2 has an antenna section 20, receives the emergency signal, measures its transmission direction, and compares it with the measurement data of the transmission direction obtained from the base station 1. A command signal is issued to activate the directional antenna 102. That is, data that has entered the receiving section 21 of the headquarters station 2 from the base station 1 is sent to the switching circuit 215 and the storage circuit 2.
13, the comparison circuit 214 compares each data of each base station 1 with the data independently received by the antenna section 20 of the headquarters station 2 and input to the receiving section 21. Here, other base stations 1 located around the base station 1 in which the signal transmission source is within the area,
Check whether each direction finding activity has been performed. At this time, when a base station 1 that the base station 1 does not receive among the surrounding base stations 1 is checked, the base station 1 that could not receive from the headquarters station 2
automatically sends a direction finding signal to the target. Then, the azimuth data of five stations, including radio wave data, is collected, and this azimuth data is input into the map data bank 227.

Furthermore, the azimuth data input to the map data bank 227 is based on the information that the azimuth lines from each base station 1 intersect on the map display 228.
By operating the keyboard of the map control computer 229, enlargement of the map, restoration of district names, etc. are executed and saved in the memory computer 230.

The headquarters station 2 detects the signal source based on this series of azimuth data. Then, a dispatch command signal is sent to the emergency vehicle 3, and the exact source of the signal is searched.

The rescue vehicle 3, which has been instructed on the command and detection area, rushes to the area where the emergency signal is transmitted and searches for the source by activating the mobile receiver 7 mounted on the vehicle near the source. At this time, the mobile receiver 7 is detachably mounted on the emergency vehicle 3 of the rescue vehicle center 6 deployed in various locations. Then, select the rescue vehicle center 6 that can be reached the earliest,
A detailed detection area is given to the rescue vehicle 3 in the rescue vehicle center 6 along with an activation command.

The transmitter 4 used in this system is a UHF
It transmits F2 radio waves, and in the embodiment, a crystal transmitting MSK modulator 301 and an NRZ signal generator 302
A digital code generating section 30 consisting of the following is planned to generate a 5-digit digital code signal and register this as a personal code (see Fig. 5). By doing this, it is possible to register 100,000 stations in one area, and by using tone squelch in each area, it is possible to use an extremely wide area. Furthermore, by adding a specific tone to the code, it becomes possible to distinguish between the type of rescue, for example, whether it involves human life or a simple malfunction.

At this time, the transmitter 4 is installed in the vehicle of the system subscriber, and when an abnormal situation occurs, the transmitter switch is turned on manually or automatically, which is particularly suitable for rescuing traffic accidents. becomes.
In addition, by making the transmitter 4 small and lightweight, and making it possible to transmit an emergency signal by transmitting a signal from the headquarters station 2 or the base station 1, it is possible to investigate kidnapping cases, missing children, and demented elderly people. It is possible to effectively respond to abnormal situations such as wandering around. Furthermore, by forming a pair of transmitters 4 and forming a device that automatically transmits an emergency signal when these transmitters 4 are separated from each other by a certain distance or more, it is possible to reduce the time when transporting cash. In the event of a theft incident, etc., in an extremely short period of time,
A rescue vehicle can be activated.

A subscriber who registers with this system carries a transmitter 4 in which his or her identification code is registered, such as by attaching it in the car. When the transmitter 4 is small and lightweight, it is not necessary to use a vehicle. If an accident or accident occurs in a place where telephone contact is not possible, the system will automatically or manually contact you.
Alternatively, an emergency signal is sent by remote control.

(Effects of the Invention) By having the configuration as described above, the present invention can find an extremely accurate transmission position even in a place where radio waves are often reflected.

That is, each base station 1 is installed at a predetermined location, and the headquarters station 2 processes the data of the emergency signal transmission direction measured by each base station 1 to search for the location of the source of the emergency signal, 3, it is possible to find an extremely accurate transmission position even in places where there are many reflections of radio waves.

Furthermore, when the omnidirectional antenna 101 receives an emergency signal, the base station 1 transmits the signal to the directional antenna 102.
automatically rotates 360 degrees horizontally to measure the direction of emergency signal transmission, and during the measurement, the omnidirectional antenna 101
When the sub-memory receiving device 116 receives another emergency signal, the sub-memory receiving device 116 stores the other emergency signal, so it is possible to sequentially measure multiple emergency signals and identify multiple emergency signal sources in a short time. It became possible.

Then, the mobile receiver 7 detects that the emergency vehicle 3 is located at the headquarters station 2.
When approaching the searched source of the emergency signal, it is possible to pinpoint the exact location of the source of the emergency signal. It can be reliably detected even if

The transmitter 4 is mounted on a vehicle or carried by an individual, and is used to send an emergency signal in case of an emergency, such as a traffic accident, kidnapping, wandering of a demented elderly person, or when transporting cash. This makes it possible to investigate and respond to incidents such as theft.

Furthermore, the headquarters station 2 has an antenna unit 20, receives the emergency signal, measures its transmission direction, compares it with the measurement data of the transmission direction obtained from the base station 1, and compares it with the measurement data of the transmission direction obtained from the base station 1. In contrast, since a command signal for activating the directional antenna 102 is issued, the detection accuracy of the emergency signal is improved and the source of the emergency signal can be searched for in an extremely short time.

As described above, according to the present invention, the transmitting position can be detected extremely accurately even in places where there are many reflections of radio waves.
Moreover, various industrially useful effects are achieved, such as being able to sequentially measure an unspecified number of emergency signals and search for multiple sources of emergency signals in a short period of time.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and Fig. 1 is a schematic diagram of the entire system, Fig. 2 is a schematic diagram showing the arrangement of base stations, Fig. 3 is a block diagram showing the base stations, and Fig. 4 is a schematic diagram of the entire system. 5 is a block diagram showing the head office, and FIG. 5 is a block diagram showing the transmitter. 1...Base station, 2...Head office, 3...Rescue vehicle, 4...Transmitter, 5...Communication line, 6...Rescue vehicle center, 7...
Mobile receiver, 10... Antenna section, 101... Omnidirectional antenna, 102... Directional antenna, 103... Rotation control device, 11... Receiving section, 111... Antenna switching device, 112... Receiving device, 113... Storage circuit, 11
4... Comparison circuit, 115... Switching circuit, 11
6... Sub-memory receiving device, 20... Antenna section,
201... Omnidirectional antenna, 202... Directional antenna, 203... Rotation control device, 21... Receiving unit, 21
1... Antenna switching device, 212... Receiving device, 213...
Memory circuit, 214... Comparison circuit, 215... Switching circuit, 216... Sub memory receiving device, 22
...Information processing unit, 221...Digital code encoder, 222...Digital code data bank, 2
23...File list computer, 224...
Memory disk, 225...Printer, 226
...CRT, 227...Map Data Bank, 228
...map display, 229...map control computer, 230...memory computer, 30...digital code generator, 301...
Crystal oscillation MSK modulator, 302...NRZ signal generator.

Claims (1)

[Claims] 1. A wide area rescue system comprising a base station 1, a headquarters station 2, a transmitter 4, and a mobile receiver 7, wherein the base station 1 and the headquarters station 2 are capable of communicating with each other. , Each base station 1 is installed at a predetermined location, and has an omnidirectional antenna 101, a directional antenna 102, and a sub-memory receiving device 116.
When 01 receives an emergency signal, the directional antenna 102 automatically rotates 360 degrees horizontally to measure the transmission direction of the emergency signal, and during the measurement, the omnidirectional antenna 101 receives another emergency signal. Sometimes, the sub-memory receiving device 116 stores the other emergency signals, and the headquarters station 2 processes the data of the emergency signal transmission direction measured by each base station 1 to determine the location of the source of the emergency signal. A transmitter 4 is mounted on a vehicle or carried by an individual and transmits an emergency signal in the event of an emergency.A mobile receiver 7 is removably mounted on the emergency vehicle 3, and when the emergency vehicle 3 approaches the source of the emergency signal searched by the headquarters 2, it is possible to identify the exact location of the source of the emergency signal. Wide area rescue system. 2 The headquarters station 2 has an antenna section 20, receives the emergency signal, measures its transmission direction, compares it with the measurement data of the transmission direction obtained from the base station 1, and compares it with the measurement data of the transmission direction obtained from the base station 1. On the other hand, directional antenna 10
2. The wide area rescue system according to claim 1, wherein the wide area rescue system emits a command signal for activating the rescue system.