JPH06296146A - Id antenna communication system - Google Patents

Abstract

PURPOSE:To capture a mobile object surely and efficiently when the object is recognized through ID communication by allowing a radio wave signal control ler having plural antennas to apply time division control to a read and a write signal. CONSTITUTION:When, for example, marathon runner being a mobile object is confirmed at a goal or the like, a transponder having data specific to a runner is carried in advance by the runner. An antenna used to make communication with the transponder is arranged to the goal. The antenna consists of plural antenna elements AT1-AT4 and they are connected to a signal analyzer. Let the AT1 be a read use antenna and the AT2 be a write use antenna. When the runner arrives in the goal, the AT1 transmits a read signal to the transponder carried by the runner at first and then the AT2 uses a time division control means built in a controller to receive a write signal from the transponder. Even when the speed of the runner is fast, the transmission and reception of the signal is ensured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ID antenna communication system, and more particularly to a communication system in which one ID signal analyzing device is provided with a plurality of antennas.

[0002]

2. Description of the Related Art In the case where a large number of moving objects are identified by a wireless ID sensor, it has been attempted to arrange a large number of antennas and identify a large number of moving objects at each antenna.

[0003]

In the case of ID communication, read / write control in a transponder attached to an identification object and a data analysis device that communicates radio waves may be adopted with the recent development of data carrier technology. Although the number has increased, in general, in the case where the transponder does not have a power source, power is often supplied by radio waves from the antenna.

On the other hand, of course, data reading and writing of the transponder is carried out through the antenna, but the power required for writing is large for the read, and therefore the antenna,
If the maximum communication distance between transponders is light,
It is about one half of the lead. From this, when the data is read and written by using the general ID recognition control, the communicable distance of the read and write is different from 2: 1.
In some cases, reading is possible but writing is not possible. In this case, the data is not updated and the original purpose cannot be achieved.

The present invention provides an antenna communication system which uses a plurality of antennas and efficiently and reliably catches a moving object when recognizing the object by ID communication.

[0006]

According to a first aspect of the present invention, there is provided a radio signal controller having a plurality of antennas in front of an ID signal analysis device, and the radio signal controller outputs read and write signals. The ID antenna communication system is characterized in that it has a time division control means, and one of the antennas is capable of switching a read signal and the other is capable of switching a write signal.

According to a second aspect of the invention, there is a radio signal controller having a plurality of antennas in front of the ID signal analyzing device, and the radio wave directing direction of each antenna and the signal output are combined and controlled to obtain a desired signal. It is an ID antenna communication system characterized by obtaining a vector.

[0008]

In the first aspect of the invention, for example, when a marathon runner, which is a moving object, is confirmed by a goal as shown in FIG.
In advance, the runner will carry a transponder with data specific to that runner. An antenna is placed in the goal to communicate with this transponder. There are a plurality of antennas, AT ₁ and AT ₂ in this example, all of which are connected to one signal analyzer as shown in FIG. The antenna AT ₁ is in charge of reading, and the antenna AT ₂ is in charge of writing. Since the runner comes into the goal from the direction of the arrow, first send a lead signal to the transponder carried by the runner by the antenna AT ₁ ,
Next, the antenna AT ₂ receives a write signal from the transponder by a time division control means by a computer built in the controller. Even when the speed of the moving object is high, the transmission / reception of the signal is surely performed. The antennas AT ₁ and AT ₂ are controlled by the controller by the time division means.

According to the second aspect of the invention, no matter which antenna is used for reading and writing, the vector of the electric field intensity of the transmitting and receiving signal is shown in FIG. become that way. For example, as shown in FIG. 4, if the lead antennas AT ₃ and AT ₄ have the same electric field directing direction, the signal strength thereof is the combined vector of FIG. In this case, it is necessary that both radio waves do not interfere with each other.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The configuration of an embodiment of the device used in the present invention is shown in FIG. 1, and the device includes a plurality of antennas AT1, AT2, AT.
3 and AT4, each antenna is RF via switching controller
It is connected to the controller. This RF controller is connected to the ID signal analyzer. The ID signal analysis device is provided with means for identifying the ID signal and switching the antenna switching signal to the switching controller in a time division manner.

In the example of FIG. 3, the antenna ATa is for leads,
The antenna ATb is for writing, and when both antennas are arranged so that the communication distances for reading and writing are almost equal, and there are many passing objects, and when many antennas are installed, Identifies the passing position of a moving object and does not affect other antennas.

In the example illustrated in FIG. 5, the antenna AT
c, the antenna ATd is used for reading, and the radio wave directing directions are opposed to each other to reduce the radio wave output to a predetermined output, while the antennas ATe and ATf have the same radio wave directing direction for writing. Is done in the controller. As a result, the intensities of the two signals are not so different according to the position of the moving object to be captured. Also in this case, as in the case of the example in FIG.
It is necessary not to affect other antennas.

In the example of FIG. 6, the read antenna is made large and the write antenna is made small so that they are oriented in the same direction, and the radio wave reception distance of the write antenna is completely determined by the arrival distance of the write radio wave. This is an example for covering.

In the example of FIG. 7, antennas ATg, ATh, A
This is a case where the direction of Ti radio waves is concentrated, and in this case, each antenna may be for reading or writing. It is preferable that the time-division control means shifts the operation time of the signal. As a result, communication with the antenna can be easily performed regardless of the direction of the radio wave of the transponder attached to the moving object.

In each of the above examples, even when the radio waves are simultaneously output and combined by a plurality of antennas, the moving object that can be controlled by the time division means includes a charged object data carrier element having a battery in addition to the transponder. However, the present invention can be implemented.

[0016]

According to the present invention, when identifying a moving object by an ID signal, a plurality of antennas are used to time-divide the signal and communication can be performed without interference with each other. Therefore, a large number of moving objects can be identified almost in synchronization. Further, even if the data carrier element attached to the moving object has a radio wave directivity in a specific direction, a reliable ID identification device can be obtained which can easily capture the data of the element.

[Brief description of drawings]

FIG. 1 is a block diagram of a device of an embodiment of an ID antenna communication system according to the present invention.

FIG. 2 is a diagram illustrating communication between an antenna and moving object detection.

FIG. 3 is a diagram illustrating an electric wave output of an antenna.

FIG. 4 is a graph illustrating the radio wave output of the antenna.

FIG. 5 is a diagram for explaining radio wave output of an antenna.

FIG. 6 is a diagram for explaining the radio wave output of the antenna.

FIG. 7 is a diagram illustrating a relationship between an antenna and a moving object.

Claims (2)

[Claims] 1. An ID signal analyzing device is provided with a radio signal controller having a plurality of antennas in front of the ID signal analyzing device. The radio signal controller has time division control means for read and write signals, and each of the antennas One of the ID antenna communication systems is capable of switching a read signal and the other of which is a write signal. 2. A radio signal controller having a plurality of antennas is provided in front of the ID signal analysis device, and a desired signal vector is obtained by combining and controlling the radio wave directing direction of each antenna and the signal output. ID characterized by
Antenna communication system.