CN202159346U - Active RFID (Radio Frequency Identification Devices) system - Google Patents

Abstract

The utility model discloses an active RFID system. The RFID system is composed of an active RFID card reader and an RFID card. The active RFID card reader includes a low frequency transmitting device used to transmit low frequency trigger signals and a high frequency receiving device used to receive acknowledge signals sent by the active RFID card. The RFID card includes a low frequency receiving device used to receive low frequency trigger signals sent by the low frequency transmitting device of the active RFID card reader and modulate coded messages of the low frequency trigger signals; and a high frequency transmitting device used to receive acknowledge signals sent by a logic control circuit and sent the acknowledge signals to the receiving device of the active RFID card reader. The active RFID system in the utility model combines advantages of the low frequency trigger signals and a high frequency receiving function. Thus, the card reading distance can be control accurately.

Description

A kind of active RFID recognition system

Technical field

The utility model relates to a kind of RFID recognition system, belongs to electronic applications, relates to a kind of active RFID recognition system specifically.

Background technology

In parking lot vehicle turnover management; The RFID recognition technology can be used for discerning moving object and can discern a plurality of labels simultaneously; Swift and convenient to operate; So it is comparatively extensive that the RFID recognition technology is used, be divided into closely (about 10cm) rfid card and remote (tens centimetres to more than 100 meters) rfid card according to reading the rfid card distance, yet the recognition technology of a lot of rfid cards but there is fatal defective in existing vehicle recongnition technique: as

A) HF frequency range passive RFID card: the rfid card sheet of HF frequency range is owing to a little less than the signal, must window the manual scanning card.

B) uhf band rfid card sheet: though uhf band can be realized remote Card Reader, because that uhf band is disturbed by water, metal is very big, in the car of back or pad pasting that rains, almost can't read, its use is restricted.

C) active RFID card: the active RFID card reader is mainly used the electric wave frequency range of 2.45GHz, 5.8GHz, and the advantage of active RFID card is following:

1) contactless read-write, maximum distance can reach 100 meters, need not accurate aligning direction;

2) can resist various rugged surroundings, like sea-freight cargo ship, harbour, warehouse, highway, workshop etc.;

3) can read and write moving object, highest movement speed can reach 120KM/ hour;

4) read-write process need not manual intervention, can accomplish automatic data acquisition;

5) high security, be difficult to counterfeit with distort;

6) read-write speed is high, can read a plurality of labels simultaneously;

7) memory data output is big, reaches as high as tens ofly million, is suitable for storing data such as various transaction event records, electronic documents, image.

Though the accuracy and the speed of this recognition technology are unquestionable; But when many cars line up to wait identification together (like Fig. 1), the wireless signal that the recognition device 10 of common active RFID card reader sends spreads over surrounding space, often is difficult to accurately identification Card Reader distance; In effective read range 30; When the back vehicle has rfid card 20, might be read, thereby wrong handle does not have the front truck of card to put into by card reader yet; The identity that recognition device 10 recognizes is that the identity of which car is difficult to confirm actually; The accurate corresponding relation that is to say the testing vehicle register that is identified and be identified between the vehicle is difficult to confirm, does not address this problem, and just can't realize the automatic management of vehicle.Though can come command range through the way of adjustment aerial angle and signal intensity, the height of vehicle, the degree of shielding all differs widely, and can't accomplish can both accurately discern under various environment at various vehicles, so its use is restricted always.

The utility model content

Deficiency based on existing RFID recognition technology; The utility model has been developed a kind of active RFID recognition system; Control transmitting range through the low frequency trigger pip, be used to solve efficiently, do not adopt traditional rfid card to be difficult to discern testing vehicle register and the problem that is identified accurate correspondence between the vehicle during the current management of parking vehicle.The utility model can reduce handling cost simultaneously, and is reliable, simple to operation, has high noise immunity, the characteristics such as identification stability of height.

For realizing above-mentioned technical purpose, the utility model provides a kind of active RFID recognition system, and it is made up of active RFID card reader and active RFID card.

Said active RFID card reader comprises a low frequencies device, is used for continuing emission low frequency trigger pip; One receiving trap is used to receive the affirmation signal that said active RFID card sends; Said active RFID card comprises a low frequency receiver, is used to receive the low frequency trigger pip of the low frequencies device emission of said active RFID card reader, and reconciles out the coded message of said low frequency trigger pip simultaneously; One logic control circuit, confirmation signal is gathered, handles and transmitted to the coded message of the low frequency trigger pip that is used for said low frequency receiver is received; One emitter is used to receive the affirmation signal that said logic control circuit sends, and is sent to the receiving trap of active RFID card reader to said confirmation signal.

The further improvement of the utility model is: the receiving trap of said active RFID card reader is a high-frequency receiving device; The emitter of said active RFID card is a high-frequency radiator.

Because the decay of low frequency on distance is very obvious; And transmitting range blocks with having or not; Have or not moisture almost irrelevant, can accurately control the be received distance after the emission, have only when active rfid card sheet to get in the low frequency range of receiving of low frequencies device emission of said active RFID card reader; The active RFID card concurrent feed signals of just can working is so the utility model can accurately be controlled the Card Reader distance.And card receives only low frequency signal and does distance control among the design, and the communication of card itself adopts the extremely low high-frequency radiator of power consumption to realize, the emission that has solved low frequency signal thus needs big power consumption, can't drive with the battery on the card.

Description of drawings

The common active RFID card of Fig. 1 is responded to the synoptic diagram of common active RFID card reader;

The synoptic diagram of Fig. 2 the utility model active RFID card induction integral type active RFID card reader;

The principle of work synoptic diagram of Fig. 3 the utility model active RFID recognition system.

Embodiment

For the benefit of to the architectural feature of the utility model active RFID recognition system and the understanding of principle of work thereof, be that example is explained below in conjunction with the preferred embodiment of the utility model of Fig. 2, Fig. 3.

Like Fig. 2, Fig. 3, the utility model provides a kind of active RFID recognition system, and said active RFID recognition system is made up of the battery 70 that an active RFID card reader 40, an active RFID card 50 and are built in said active RFID card 50.

The low frequencies device 41 that said active RFID card reader 40 is made up of integral type is formed with high-frequency receiving device 42, and the low frequencies device 41 in the said active RFID card reader 40 also can be split type with high-frequency receiving device 42.The low frequencies device 41 of said active RFID card reader 40 is to be used for continuing 410 (said low frequency trigger pip 410 can comprise transmitter codes information) of emission low frequency trigger pip; As the low frequency trigger pip 410 of launching 125KHz; Through actual test, can be controlled at 4 meters receiving range, under various complex conditions; Precision still can reach ± 20cm, and it can satisfy the needs of vehicle management card fully.Because the decay of low frequency on distance be very obvious, and transmitting range blocks with having or not, and has or not moisture almost irrelevant, so the utility model can accurately be controlled the be received distance after the emission; The track that enters and exits of vehicles is remembered in high-frequency receiving device 42 confirmation of receipt signals 500 backs of active RFID card reader 40.

Said active RFID card 50 is made up of low frequency receiver 51, high-frequency radiator 53 and the coupled logic control circuit that connects 52.Said low frequency receiver 51 receives the low frequencies device 41 lasting low frequency trigger pips 410 of launching of said active RFID card reader 40 and this low frequency trigger pip 410 is modulated, and then sends the coded message of separating the low frequency trigger pip 410 of making; Said logic control circuit 52 is to be used for confirmation signal is gathered, handles and transmitted to the coded message of said low frequency trigger pip 410 to said high-frequency radiator 53; Said high-frequency radiator 53 receives the affirmation signal 410 of said logic control circuit 52 emissions and sends to this confirmation signal 410 high-frequency receiving device 42 of active RFID card reader 40.

In the utility model; Have only when active rfid card sheet 50 and enter in the low frequency range of receiving 60 of low frequencies device emission of said active RFID card reader; Low frequency trigger pip 410 can worked and send to active RFID card 50; So the utility model can accurately control the Card Reader distance, even also can not cause mess code in the vehicle flowrate peak period when vehicle is through the critical point, leak the card situation.The utility model has reduced handling cost simultaneously, and it is reliable, and is simple to operation, the utlity model has high noise immunity simultaneously, the characteristics such as identification stability of height.

Combining Fig. 3 once more, is that example is explained orally the control method that said active RFID accurately reads the border with the preferred embodiment of the utility model among Fig. 3, and its control method comprises the following steps:

A) the low frequency receiver 41 of the active RFID card reader 40 of the appropriate location through being placed in the vehicle pass-through only way which must be passed continues emission low frequency trigger pip 410 towards periphery; After vehicle got in the low frequency range of receiving 60, the low frequency trigger pip 410 of its emission was installed in 50 receptions of active RFID card of vehicle appropriate location;

B) the low frequency receiver through the said active RFID card 50 51 low frequency receiver 41 that receives said active RFID card reader 40 continues the low frequency trigger pips 410 of emission; And this low frequency trigger pip 410 modulated, then send and separate the coded message of making said low frequency trigger pip 410;

C) confirmation signal 500 is gathered, handles and transmitted to the coded message of the 52 pairs of said low frequency trigger pips 411 of logic control circuit through said active RFID card 50 to said high-frequency radiator 53;

D) when the high-frequency radiator 53 of said active RFID card 50 is activated, (2.45GHz for example 5.8GHz) is sent to confirmation signal 500 high-frequency receiving device 42 of active RFID card reader 40 through its high frequency;

E) high-frequency receiving device 42 through active RFID card reader 40 receives said confirmation signal 500, remembers the track that enters and exits of vehicle.

The utility model has combined the advantage of low frequency trigger pip 410 and high frequency, and it has high noise immunity, and the identification stability of height really reaches no error code, do not have the card of leakage, thereby realizes the accurate control of Card Reader frontier distance.

Previous embodiment only is for the utility model is described; And non-limiting the utility model; As long as combine the advantage of low frequency trigger pip 410 and high frequency to realize reading the concept that all belongs to the utility model of boundary Control; So every any trickle modification of the foregoing description being made according to the technical spirit of the utility model, be equal to replacement and improve, only otherwise unconventionally go out the category that accompanying claims defined, all should be included in the protection domain of the utility model technical scheme.

Claims (6)

1. active RFID recognition system, it is made up of active RFID card reader and active RFID card, it is characterized in that said active RFID card reader comprises a low frequencies device, is used for continuing emission low frequency trigger pip; One receiving trap is used to receive the affirmation signal that said active RFID card sends; Said active RFID card comprises a low frequency receiver, is used to receive the low frequency trigger pip of the low frequencies device emission of said active RFID card reader, and modulates the coded message of said low frequency trigger pip simultaneously; One logic control circuit, confirmation signal is gathered, handles and transmitted to the coded message of the low frequency trigger pip that is used for said low frequency receiver is received; One emitter is used to receive the affirmation signal that said logic control circuit sends, and is sent to the receiving trap of active RFID card reader to said confirmation signal.

2. active RFID recognition system as claimed in claim 1, the receiving trap that it is characterized in that said active RFID card reader is a high-frequency receiving device; The emitter of said active RFID card is a high-frequency radiator.

3. an active RFID card reader is characterized in that it comprises a low frequencies device, is used for continuing emission low frequency trigger pip; One receiving trap is used to receive the affirmation signal that said active RFID card sends.

4. active RFID card reader as claimed in claim 3, the receiving trap that it is characterized in that said active RFID card reader is a high-frequency receiving device.

5. active RFID card is characterized in that it comprises a low frequency receiver, is used to receive the low frequency trigger pip of the low frequencies device emission of said active RFID card reader, and modulates the coded message of said low frequency trigger pip simultaneously; One logic control circuit is used for confirmation signal is gathered, handles and transmitted to the coded message of said low frequency trigger pip; One emitter is used to receive the affirmation signal that said logic control circuit sends, and is sent to the receiving trap of active RFID card reader to said confirmation signal.

6. active RFID card as claimed in claim 5, the emitter that it is characterized in that said active RFID card is a high-frequency radiator.

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