JP3032389B2 - Mobile object identification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving object identification device.

[0002]

2. Description of the Related Art A moving object identification apparatus generally includes an interrogator arranged at a fixed position and a transponder attached to a moving object or the like.
This is an effective device for managing information such as specifications, processing and inspection of each product in the process such as payout. The mobile object identification device is used not only for the production line but also for transportation, physical distribution, and the like, and can also be used for a toll road toll collection system.

The transponder of this type of mobile unit identification device is also called a data carrier, and usually has a sealed structure in which an antenna, a transmission / reception unit and the like are built, and is attached to the mobile unit.

When the mobile object identification device is applied to a system for accessing data with a transponder provided for a high-speed moving object, such as a toll collection system for a toll road, the transponder is placed in the beam area of the interrogator at an arbitrary timing. In order to enter at a high speed, the interrogator repeatedly executes the same operation by a continuous auto read / write method.

A case where data is written from an interrogator to a transponder will be described below with reference to FIG.

[0006] The interrogator sends a start command to the transponder that has entered the beam area, and the transponder responds to this and sends back a start response to the interrogator. When the interrogator receives this activation response, the interrogator knows that the transponder is in the beam area. Next, the interrogator transmits the write command together with the read data in the RAM. When the transponder receives the write command, the transponder registers the data in the RAM and asks a write response indicating that the data has been registered. Reply to the container. When the interrogator receives the write response, it knows the end of the write execution, sends an end command to the transponder, and ends the series of communication sequences.

[0007]

FIG. 7 is a block diagram showing an example in which this kind of moving object identification device is applied to a moving object identification system. An interrogator 1 for writing information about a waypoint in a transit point at a transit point of a travel route is installed at a predetermined point on the travel route, and a moving body 2 provided with each transponder is located in a beam area of the interrogator 1. You are passing at high speed.

When registering a waypoint of such a mobile object identification system or operation management system, there may be a case where a plurality of transponders that move at high speed exist in the same beam area as shown in FIG. There is a problem shown. That is, in the conventional mobile unit identification device, a transit point, which is data, is written in the transponder by using a transmission / reception method of a plurality of commands such as a start command, a write command, and an end command. On the other hand, all of these series of communication sequences cannot be terminated.

In addition, since bidirectional communication between the interrogator and the transponder is essentially one-to-one communication, if there are a plurality of transponders that pass almost simultaneously in the beam area, all of these transponders will respond. It is impossible to write data to the container as well.

Accordingly, the present invention provides a moving object identifying apparatus having an interrogator capable of reliably performing a write operation on a plurality of transponders moving at a high speed.

[0011]

According to the present invention, there is provided a transponder having a storage unit, an interrogator for communicating with the transponder passing through the beam area via a non-contact transmission medium, interrogator comprises means for transmitting a command to a receive-only state the transponder with respect to the responder passing through the beam area, the responder is the command thus received upon receiving a command from the interrogator Determines if there is a transmission error
Means for setting the transponder to the reception only state when it is determined that there is no transmission error, and means for setting the reception prohibited state for a predetermined time after writing the data transmitted from the interrogator at the time of command reception to the storage unit And a mobile object identification device including:

[0012]

When the transponder enters a beam area of the interrogator and receives a command from the interrogator to set the transponder to the reception-only state, the transponder determines whether the received command has a transmission error.
When it is determined that there is no transmission error, the communication is enabled from the standby state, and at the same time, the state is normally changed from the state of returning a response to the command from the interrogator to the state of receiving only. Further, the transponder in the receiving state, for example, writes data transmitted from the interrogator at the same time as the command into the storage unit, and thereafter, repeatedly transmits the data from the interrogator by means for disabling reception for a predetermined time. Inhibit command reception.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 3 is a block diagram schematically showing the configuration of an embodiment of the moving object identification apparatus according to the present invention.

As shown in FIG. 3, a transponder 10 includes an antenna 11, a transceiver 12, a ROM (Read Only Memory) 1
3, a RAM (random access memory) or a non-volatile storage memory 14, a power supply 15, and a CPU 16. The antenna 11 is connected to the CPU 16 via a transceiver 12, and a ROM 13, a RAM 14, a power supply 15,
And the CPU 16 are connected to each other.

The transceiver 12 is connected to the CPU 16. The transceiver 12 has a function of demodulating a modulated microwave transmitted from the interrogator 20 received via the antenna 11 and performing a digital modulation according to data to be transmitted to an unmodulated wave received from the interrogator 20. Have.

The ROM 13 generally stores a system program for controlling the operation of the transponder 10.
The AM 14 stores data such as an ID code for distinguishing itself from others.

The antenna 11 is, for example, a rectangular patch antenna which also serves as transmission and reception.

The interrogator 20 includes an antenna 21 and a transceiver 2
2, a ROM 23, a RAM 24, a power supply 25, an I / O interface 26, and a CPU 27. The antenna 21 is connected to the CPU 27 via a transmitter / receiver 22, and the ROM 23, the RAM 24, the power supply 25, the I / O interface 26 , And the CPU 27 are connected to each other.

The transmitter / receiver 22 has a function of transmitting various commands via the antenna 21 and then transmitting an unmodulated microwave to read a response and data from the transponder 10. That is, it receives and demodulates a modulated wave including a response and data returned from the transponder 10. Further, the transceiver 22 has a function of modulating a microwave according to information transmitted to the transponder 10. The antenna 21 is usually
An array antenna in which a plurality of rectangular patch antennas are arranged is used to improve directivity and support long-distance communication.

The interrogator 20 is an I / O interface 2
6, it is connected to a data processing terminal 30 such as a personal computer or a programmable controller.

A system program for controlling the operation of the interrogator 20 is stored in the ROM 23,
It is stored in AM24. The ID code added to the activation response from the transponder 10 is stored in the RAM 24.

FIG. 4 is an explanatory diagram showing a write communication sequence of one embodiment of the moving object identification apparatus according to the present invention.

As shown in FIG. 4, according to the present embodiment, the write communication sequence is achieved by the interrogator transmitting a response-less write command for setting the transponder to receive only at a constant repetition period. As a result, the interrogator sets the high-speed transponder passing through the beam area to the reception-only state. Further, as will be described later, the transponder enters a reception prohibition state for a certain period of time after data writing by the write command, and prohibits rewriting.

Next, the write communication sequence according to the present invention shown in FIG. 4 will be described in more detail with reference to a flowchart.

FIG. 1 is a flowchart showing an example of a communication sequence on the interrogator side of an embodiment of the moving object identification apparatus according to the present invention, and FIG. 2 is an example of a communication sequence on the responder side corresponding to FIG. It is a flowchart figure shown.

As shown in FIG. 1, the interrogator first reads data to be written to the transponder from the RAM in order to access the transponder which enters the beam area at high speed at an arbitrary timing. (Step S10). next,
The interrogator transmits the data read in step S10 to the transponder together with the response unnecessary write command (step S11). This write command is a command that does not request a response from the transponder as described above, that is, puts the transponder into the reception-only state.

Next, it is determined whether or not there is a stop instruction (step S12). If there is a stop instruction and the write command transmission process is not performed continuously, the operation is stopped. On the other hand, if there is no stop instruction, the process returns to step S11 to repeatedly transmit a write command to write data to the next responding transponder.

On the other hand, as shown in FIG. 2, the transponder determines whether a write command has been received from the interrogator (step S20). If the transponder is in the beam area of the interrogator, it receives the write command and releases its standby state. Then, it is determined whether there is a transmission error by detecting a transmission error such as a sum check or a parity check, that is, the validity of the command is determined (step S2).
1) If there is a transmission error, execute step S20 again. If there is no transmission error, the self is set to the reception only state and R
Register data from the interrogator in the AM (step S2
2) Read out predetermined reception prohibition time data written in the RAM (step S23). Then, it is determined whether or not a predetermined reception prohibition time has elapsed (step S2).
4) When the time has elapsed, a series of reception processing ends.

As described above, according to this embodiment, the interrogator is dedicated to transmission for exclusively transmitting a write command, and the transponder is dedicated to reception in response to an instruction from the interrogator. The transmission of a start command, the reception of a start command, the transmission of a write response, the reception of a write response, and the transmission of an end command can be omitted, and the interrogator can increase the number of times of transmission of the write command. As a result, the number of times a write command can be received in the beam area of the transponder increases. As a result, transmission errors can be covered, data can be prevented from being rewritten from the interrogator to the transponder, and
Writing can be performed on a plurality of transponders that move within the beam area of the interrogator at high speed.

In the above embodiment, a microwave system is used as a transmission medium, but the present invention is not limited to this, and an electromagnetic coupling system, an electromagnetic induction system, an optical communication system, or the like may be used.

Next, a description will be given of a processing example of a waypoint when the moving object identification apparatus according to the present invention is applied to a system for identifying a moving object that actually moves.

FIG. 5 is a route diagram of a moving object for explaining a moving object identification system to which the moving object identification device according to the present invention is applied. In FIG. 5, the entrance point 51 and the exit point 5
Route A50 (entrance point 51 →
There are two types of routes: via point A 52 → exit point 53) and route B 54 (entrance point 51 → via point B → exit point 53). The interrogator is installed at each of the points 51, 52, 53 and 55.

As shown in Table 1, the data stored in the RAM of the transponder 10 included in the moving body moving on this route is unique data (I
D code, expiration date), entrance data registered at the entrance point (entrance point code, mobile unit identification code), transit data registered at the transit point (transit point code), and exit data registered at the exit point (exit point) Code, mobile unit identification code, and route use data). Table 1 shows Route B
It is an example of processing of a moving object that has passed through a point B via route 54 of 54.

[0035]

[Table 1]

The interrogator 20 reads from the RAM 24 a waypoint code: C333 indicating that the vehicle has passed the waypoint 55 from the RAM 24, and transmits this data to a response-necessary write command that makes a response unnecessary. In addition, the transmission is repeated at an arbitrary timing toward a transponder attached to a moving body entering at a high speed.
On the other hand, when the transponder 10 receives the response-unnecessary write command, it checks the transmission error and determines that the command is valid.
Register with. Thereafter, the transponder 10 reads from the RAM 14 the reception prohibition time sufficient to pass through the transit point: 1 minute and 10 seconds, and prohibits the reception for 1 minute and 10 seconds. Prevents command rewriting.

According to the above-described method, the waypoint code indicating the waypoint can be registered in a plurality of moving bodies without being decelerated at the same time by the moving body identification system. And special components that can be accessed one by one are not required.

Further, the above-mentioned moving object identification device can be applied to a toll road toll system. In this case, the mobile unit is read as a vehicle, the identification code is read as a vehicle code, and the route usage data is read as a usage fee. When applied to a toll road toll collection system, a transit point code can be recorded in the transponder, so that the use route of the transponder can be specified, and an accurate usage fee can be collected. Also, in this case,
The transponder may be a prepaid system in which the usage fee is paid in advance, or a post-paid system in which the usage fee is paid later.

[0039]

As described in detail above, the moving object identification apparatus according to the present invention provides an interrogator for communicating with a transponder having a storage unit and a transponder passing through a beam area via a non-contact transmission medium. includes bets, interrogator comprises means for transmitting a command to a receive-only state the transponder with respect to the responder passing through the beam area, the responder is, upon receiving a command from the interrogator To the received command
Determines whether there is an error and determines that there is no transmission error.
Means for setting the transponder to the reception only state when the command is received, and means for disabling the reception for a predetermined time after writing the data transmitted from the interrogator at the time of command reception to the storage unit. Even if a plurality of high-speed transponders that have entered the beam area of the interrogator exist in the same beam area of the interrogator, data can be written. In particular, a toll road toll collection system using a mobile object identification device And the point-in-time registration in the operation management system can be performed without stopping the moving body.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating an example of a communication sequence on the interrogator side of an embodiment of a moving object identification device according to the present invention.

FIG. 2 is a flowchart illustrating an example of a communication sequence on the transponder side of the embodiment of the moving object identification device according to the present invention.

FIG. 3 is a block diagram schematically showing the configuration of an embodiment of a moving object identification device according to the present invention.

FIG. 4 is an explanatory diagram showing an outline of a write communication sequence of the mobile object identification device according to the present invention.

FIG. 5 is an explanatory diagram showing an embodiment in which the moving object identification device according to the present invention is applied to a toll road.

FIG. 6 is an explanatory diagram showing an outline of a communication sequence of a conventional mobile object identification device.

FIG. 7 is an explanatory diagram showing the waypoints of the toll road toll collection system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Transponder 20 Interrogator 11, 21 Antenna 12, 22 Transceiver 13, 23 ROM 14, 24 RAM 15, 25 Power supply 16, 27 CPU 26 I / O interface 30 Data processing terminal

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuo Fukasawa 70, Yanagimachi, Yuki-ku, Kawasaki-shi, Kanagawa Pref. Toshiba Yanagimachi Plant (56) References JP-A-4-277942 (JP, A) Field (Int.Cl. ⁷ , DB name) H04B 1/59 H04B 5/00 G06K 17/00

Claims (1)

(57) [Claims] 1. An interrogator having a storage unit, and an interrogator for communicating with the transponder passing through a beam area via a non-contact transmission medium, wherein the interrogator communicates with the beam area. Means for transmitting a command to set the transponder to a receive-only state to a transponder that passes therethrough,
But the received when receiving the command from the interrogator
Judge whether there is a transmission error in the command
Means for setting the transponder to the reception only state when it is determined that there is no data, and setting the reception prohibited state for a predetermined time after writing the data transmitted from the interrogator at the time of receiving the command to the storage unit. And a means for identifying a moving object.