JPH0535935B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention provides a
This invention relates to a mobile object position detection system using a wireless response method that can wirelessly collect ID (individual identification) codes and data.

(Prior Art) Conventionally, when performing mobile radio communication, the following methods have been used, for example. That is, FIG. 5 is a configuration diagram showing an AVM system distributed reception method used for detecting the position of a moving object such as a vehicle, and FIG. 6 is a time chart of the communication signal.

As shown in these figures, the polling signal (POL) sent out as radio waves from the wireless transmitter 1
When the portable wireless device attached to each mobile object a to b returns an individual identification (ID) signal to the receiver 2, the position of the mobile object can be determined based on the presence of the mobile object in the zone where the signal was received. It's becoming like that.

A response signal including an ID signal given in advance to the polling signal is received by the receiver 2 from the portable radio of the mobile body. Which receiver 2 receives this response signal?
Once it is known whether the mobile object has been received, the processing device 3 processes it, and the position of the moving body can be displayed on the display 4.

If this communication system is adopted in an intelligent building that has both advanced information communication functions and building management functions, the system will be as shown in FIG. 7, for example.
In other words, fixed radio equipment (TRX) is installed in each room of the building.
5 and 6 are installed, and when a polling signal (POL) is transmitted from these fixed radios 5 and 6 via the antenna, a response signal containing an ID code is returned from the portable radios of mobile units 7 to 9, and the A response signal is received by the fixed radios 5, 6 and sent to the processing device 3.

Figure 8 is a time chart of the communication signal.Similar to the one shown in Figure 5, it is possible to know which fixed wireless device received the response signal including the ID signal from the portable wireless device of the mobile object. Since the positions of the moving bodies 7 to 9 can be recognized, the destination of the moving bodies can be known and various application systems can be constructed.

(Problems to be Solved by the Invention) However, in the case of the above system, as shown in FIG. 9 and FIG. Since the position signals of both the fixed radio 5 and the fixed radio 6 are transmitted to the processing device 3, the position detection of the mobile object becomes inaccurate. In order to prevent this, it is possible to completely shield the walls of the facility or finely adjust the position of fixed radio equipment, but this poses problems that are technically difficult and expensive.

Furthermore, mobile units require a portable radio to transmit an ID code, which is cumbersome to carry and difficult to handle.

SUMMARY OF THE INVENTION An object of the present invention is to provide a position detection system using a transponding card that can eliminate the above problems and accurately and easily detect the position of a moving object.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a position detection system using a transponding card for detecting the position of a moving object, and a signal processing device installed in a facility. and connected to the processing device,
A plurality of fixed wireless devices each having a transmitter that synchronizes and transmits a polling signal and a position signal, and a receiver that receives the signal, and a plurality of fixed wireless devices that are attached to a mobile object and that transmit position signals transmitted from the fixed wireless device. A transponding card is provided with a memory for receiving and storing the location signal of the stronger radio wave, and the transponding card receives a signal for identifying itself in response to reception of the polling signal and stores it in the memory. A fixed wireless device receives the position signal, and the processing device detects the position of the mobile object based on the signal received by the fixed wireless device.

(Function) According to the present invention, as described above, a transponding card is provided which is equipped with a memory for receiving and storing a position signal having a stronger radio wave among the position signals transmitted from a fixed wireless device. The transponding card transmits a self-identifying signal and a location signal stored in the memory in response to receiving the polling signal, receives the signal with a fixed radio, and converts the transponding card to the signal received by the fixed radio. Based on this, the processing device detects the position of the moving object.

Therefore, the position of the mobile object can be accurately and easily determined without having to strengthen the shielding of each room in the facility or make detailed adjustments to the position of the fixed wireless station.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Note that the transponding card (hereinafter referred to as TRC) here refers to an IC card with a wireless communication function added.

FIG. 1 is a configuration diagram of a position detection system using a TRC according to the present invention, FIG. 2 is a time chart of communication signals in the position detection system, and FIG. 3 is a configuration diagram of the TRC.

In the figure, 11 and 12 are fixed wireless devices installed in rooms of the facility, and 13 and 14 are fixed wireless devices 11 and 1.
2 is an antenna connected to each, 15 is a TRC attached to a moving object such as a person or animal, 16 is a processing device installed in a facility center, etc.
Processes signals transmitted from each fixed radio device 11, 12.

First, the configuration of TRC will be explained.

In Fig. 3, 15-1 is a control unit that manages and controls the entire TRC, 15-2 is a memory that stores wireless communication control procedures, the ID code and location information of the TRC itself, and 15-3 is a fixed wireless device. 15-4 is a key input unit for inputting data such as an ID code;
-5 is a power supply section that supplies power to each section within the TRC.

Although not shown, a display unit that displays various information, a clock unit that generates a time signal, and the like may be provided.

In addition, this TRC is constructed in the form of a light, short, and small card, making it easy to wear.

Next, the position detection system using this TRC will be explained.

Polling signals (POL) from fixed radios (TRX) 11 and 12 installed in designated rooms of the facility, etc.
At the same time, an address signal (AD1, AD2) indicating the position of each fixed radio device is added and transmitted. In this case, all transmission signals from each fixed radio device TRX are sent out at the same timing. Therefore, TRC15
may be reached by multiple polling signals and address signals, that is, POL+AD1 and POL+AD2, but the signal with the stronger radio wave POL
Since +AD1 masks the signal POL+AD2, which has a weaker radio wave, only the address AD1 is stored in the TRC15. Thereafter, the TRC 15 sends out an ID signal and a position signal ID+AD1 as a response signal. This response signal is received by each fixed wireless device, and the received signal is processed by the processing device 16 to detect the position of the TRC 15. In this case, even if the ID+AD1 signal is received by the fixed wireless devices 11 and 12 at the same time, the processing device 16 will not incorrectly determine the location because the received signal includes the location signal.

FIG. 4 is a time chart of communication signals showing another embodiment of the present invention, in which position signals (AD1, AD2) are normally sent out at regular intervals, and polling signals (POL) are sent out only when necessary. I try to do that.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) As described above in detail, according to the present invention,
A position detection system using a transponding card that detects the position of a mobile object, which includes a signal processing device installed in a facility, and a transmitter connected to the processing device to synchronize and transmit a polling signal and a position signal. a plurality of fixed wireless devices each having a receiver section and a receiving section for receiving signals; and a plurality of fixed wireless devices that are attached to a moving body and receive and store a position signal with a stronger radio wave among the position signals transmitted from the fixed wireless devices. a transponding card having a memory, the transponding card transmitting a self-identifying signal and a location signal stored in the memory in response to receiving the polling signal, and transmitting the signal to a fixed radio. The processing device detects the position of the moving object based on the signal received by the fixed radio device. (1) The shielding of each room in the facility can be strengthened and the location of the fixed radio device can be detected. To accurately and easily grasp the position of a moving object without making detailed adjustments.

(2) Furthermore, the system configuration is extremely simplified compared to conventional systems.

(3) Furthermore, when the position detection by TRC according to the present invention is used as a subsystem of the control system of an intelligent building, it is possible to further improve the functionality of the building. Furthermore, since there is no need to make any special modifications to the facility when adopting this system, it can be applied to existing buildings extremely easily.

As described above, the present invention has various advantages and the effects brought about by it are significant.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a position detection system using a transponding card according to the present invention, FIG. 2 is a time chart of the communication signal, FIG. 3 is a configuration diagram of a transponding card, and FIG. 4 is a configuration diagram of a transponding card according to the present invention. Fig. 5 is a configuration diagram of a conventional mobile radio system, Fig. 6 is a time chart of communication signals of the same mobile radio system, and Fig. 7 is a conventional mobile radio in a facility. FIG. 8 is a communication system configuration diagram, FIG. 8 is a time chart of communication signals in the mobile radio communication system, FIG. 9 is an explanatory diagram of problems in the prior art, and FIG. 10 is a time chart of communication signals in FIG. 11, 12...Fixed radio device, 13, 14...Antenna, 15...Transponding card (TRC), 15-1...Control unit, 15-2...Memory, 15-3...Wireless transmitting/receiving unit , 15-4...
Key input unit, 15-5...power supply unit, 16...processing device.

Claims (1)

[Claims] 1. (a) A signal processing device provided in a facility; (b) A transmitter connected to the processing device and configured to synchronize and transmit a polling signal and a position signal, and to receive the signal. (c) a plurality of fixed wireless devices each having a receiving unit; and (c) a memory attached to a mobile object that receives and stores a position signal with a stronger radio wave among the position signals transmitted from the fixed wireless devices. (d) the transponding card transmits a self-identifying signal and a location signal stored in the memory in response to receiving the polling signal, and transmits the signal to a fixed radio. A position detection system using a transponding card, in which the processing device detects the position of a mobile object based on the signal received by the fixed wireless device.