CN104700128A - Adaptive power adjusting ultrahigh frequency radio frequency identification card sender - Google Patents
Adaptive power adjusting ultrahigh frequency radio frequency identification card sender Download PDFInfo
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Abstract
The invention discloses an adaptive power adjusting ultrahigh frequency radio frequency identification (RFID) card sender. The card sensor comprises a central processing unit, the central processing unit receives signals sent from an infrared emission sensor, after processing the signals, the central processing unit sends a control command to a power setting module, the power setting module outputs power setting data to a radio frequency module according to the command sent from the central processing unit, the radio frequency module sends data to a radio frequency label through a wireless transmission mode, the radio frequency module simultaneously receives feedback signals of the radio frequency label, the radio frequency module sends the feedback signals to the central processing unit through a change capturing module and a collision detection module, the central processing unit regulates a command sent to the power setting module according to the data sent from the change capturing module, and the central processing unit controls the working state of a buzzer and an indication lamp according to the commands sent from the change capturing module and collision detection module. The card sender meets the on-site working demands of the card sender use under the environment with frequent radio frequency label change or different kinds of special radio frequency labels.
Description
Technical field
The present invention relates to contactless automatic identification technology field, be specifically related to the ultrahigh frequency radio frequency identification card sender that a kind of power adaptive regulates.
Background technology
In ultrahigh frequency automatic recognition system, antenna in radio frequency identification (RFID) is the chief component of radio-frequency recognition system, directly affect its performance and stability, the change of the physical environment (as metal, water etc.) of application scenario or even the disposing way of surrounding articles all very easily causes the Parameters variation of antenna, this change can produce two disadvantageous consequences: first, the emitted energy of power amplifier module can be reduced, cause module seriously generate heat and damage; Secondly, can reflective power be produced, the signal to noise ratio (S/N ratio) of receiving circuit will be reduced thus.
Untouchable due to radio-frequency (RF) identification, when radio frequency label carries out data write, easily recognize multiple label, or the label recognized is not the label that will write.Especially in hair fastener process, if write information in the radio-frequency (RF) tag of non-corresponding, bring confusion will to follow-up asset management.
The main method of existing accurate recognition is started with from management, each read-write acquiescence is all of a sort radio-frequency (RF) tag, and each only have a radio-frequency (RF) tag, the radio-frequency (RF) tag not writing away from other or write near card sender, thus power limitation, ensure only to recognize a radio-frequency (RF) tag at every turn.So just require that each write all needs configuration parameter with the change conformed, and the configuration parameter of ultrahigh frequency (UHF) recognition system has a lot, very high to the requirement of operator, simultaneously, can not ensure that the radio-frequency (RF) tag of each batch is consistent, and the radio-frequency (RF) tag of same batch can not ensure the crash consistency of its characteristic.Thus being unfavorable for streamlined operation, interruption rate is high, and efficiency is low.This method can not meet the demand of suitability for industrialized production.
Chinese patent ZL:201110142730.1 discloses a kind of RFID card-issuing equipment and disposal route thereof, the method comprises the following steps: RFID card-issuing equipment determines the current operation to RFID label tag according to the instruction of background information platform or the voice command of operating personnel collected, wherein, this operation comprise following one of at least: card seeking, Card Reader, write card; RFID card-issuing equipment utilizes voice message to instruct and confirms the current operation to RFID label tag.Described invention adds system performance and processing power, improves Consumer's Experience, but still it is high not solve interruption rate, inefficient problem.
Summary of the invention
The object of the invention is, overcomes defect of the prior art, the ultrahigh frequency radio frequency identification card sender providing a kind of power adaptive to regulate.
Technical scheme of the present invention is: the ultrahigh frequency radio frequency identification card sender providing a kind of power adaptive to regulate, described card sender comprises central processing unit, infrared emission sensor, power setting module, radio-frequency module, radio-frequency (RF) tag, change capture module, collision detection module, hummer and pilot lamp, central processing unit receives the signal of infrared emission sensor, central processing unit sends and controls signal to power setting module, power setting module outputs control signals to radio-frequency module, radio-frequency module sends wireless signal to radio-frequency (RF) tag, the simultaneously wireless signal beamed back of received RF label, radio-frequency module outputs signal to change capture module and collision detection module, change capture module and collision detection module output signal are to central processing unit, central processing unit outputs control signals to hummer and pilot lamp.
Wherein preferred technical scheme is, described infrared emission sensor comprises infrared transmitter and infrared remote receiver, the slot of radio-frequency (RF) tag is provided with between described infrared transmitter and receiver, infrared transmitter is arranged on the lower socket of slot, infrared remote receiver is arranged on the upper socket of slot, and wherein infrared remote receiver is connected with central processing unit.
Preferred technical scheme also has further, the span of described power setting module output power is 0dBm ~ 31dBm, the output power that 0dBm is corresponding is 1mW, described power setting module output power adopts the even stepping of linear formula Power_0+m × STEP=Suited_Power, in formula, Power_0 is initial power, m is natural number, and Suited_Power is for obtaining rational performance number.M increases progressively, till card sender recognizes one and only recognizes a radio-frequency (RF) tag.In like manner, when recognizing more than one radio-frequency (RF) tag, then adopt mode Power_0-m × STEP=Suited_Power that stepping is successively decreased, till card sender recognizes one and only recognizes a radio-frequency (RF) tag.
Corresponding power when recognizing first radio-frequency (RF) tag is designated as Lower_1_Tag, when will recognize second radio-frequency (RF) tag, power is designated as Higher_2_Tag, and rational performance number Suited_Power scope is: Lower_1_Tag≤Suited_Power≤Higher_2_Tag.When power strengthens, the label number of times recognized in unit interval can increase, identify that number of times is designated as Win_Count by the current unit interval, the identification number of times after Modulating Power is designated as new_Win_Count, when power being set to maximal value 31dBm, corresponding identification number of times is designated as All_Count.Win_Count value corresponding to setting Suited_Power, recognizes one and an only radio-frequency (RF) tag to ensure to stablize.The All_Count=0 when power is 31dBm, illustrate that card sender None-identified is to label, label is improper label, buzzer warning.
Preferred technical scheme also has further, the output power of described power setting module adopts non-linear uniform step-by-step system, output power is carried out Automatic adjusument by adoption rate integral algorithm, Power_0+m × STEP × (m-1)=Suited_Power, the output power of described power setting module increases from 0dBm, when recognizing first radio-frequency (RF) tag, power is designated as Lower_1_Tag, power continues to increase, when recognizing second radio-frequency (RF) tag, power is designated as Higher_2_Tag, rational performance number Suited_Power scope is: Lower_1_Tag≤Suited_Power≤Higher_2_Tag.
Preferred technical scheme also has further, the output power of described power setting module adopts non-linear uniform decreasing fashion, output power is carried out Automatic adjusument by adoption rate integral algorithm, Power_0-m × STEP × (m-1)=Suited_Power, the output power of described power setting module is successively decreased from 31dBm, when recognizing second radio-frequency (RF) tag, power is designated as Higher_2_Tag, power continues to successively decrease, when recognizing first radio-frequency (RF) tag, power is designated as Lower_1_Tag, rational performance number Suited_Power scope is: Lower_1_Tag≤Suited_Power≤Higher_2_Tag.
Preferred technical scheme also has further, be provided with radio-frequency (RF) tag in described slot and insert induction pick-up, insert induction pick-up when radio-frequency (RF) tag and detected that radio-frequency (RF) tag puts into slot, just start the power stage of radio-frequency module and corresponding power setting module self-adaptation output signal; Meanwhile, during the shutdown of described card sender, in central processing unit, store the mean value that radio-frequency module exports the rational performance number Suited_Power of radio-frequency (RF) tag to, for as Power_0 when RFID card sender starts next time.
Preferred technical scheme also has, and described central processing unit is the central processing unit in card sender.
Advantage of the present invention and beneficial effect are, the ultrahigh frequency RFID card sender that power adaptive of the present invention regulates, under meeting the frequent environment changed radio-frequency (RF) tag or comprise multiple special-shaped radio-frequency (RF) tag, use the demand of RFID card sender on-site working, such as shield the open office space of wireless signal difference, or the surrounding enviroment change occasion such as greatly during mobile office.
Operating personnel connect RFID card sender and main control system, radio-frequency (RF) tag are put into and specify draw-in groove normally to read and write, do not need to carry out optimum configurations.RFID card sender has the detection of autonomous radio-frequency (RF) tag and power adaptive regulatory function, when solving radio-frequency (RF) tag hair fastener to greatest extent wrong identification or identification less than problem.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the ultrahigh frequency radio frequency identification card sender that power adaptive of the present invention regulates;
Fig. 2 is the Fast Convergent adaptive algorithm schematic diagram of the power of the ultrahigh frequency radio frequency identification card sender that power adaptive of the present invention regulates.
In figure: 1-central processing unit, 2-infrared emission sensor, 21-infrared transmitter, 22-infrared remote receiver, 23-slot, 3-power setting module, 4-radio-frequency module, 5-radio-frequency (RF) tag, 6-change capture module, 7-collision detection module, 8-hummer, 9-pilot lamp.
Embodiment
As shown in Figure 1, the present invention is the ultrahigh frequency radio frequency identification card sender that a kind of power adaptive regulates, described card sender comprises central processing unit 1, central processing unit 1 receives the signal that infrared emission sensor 2 sends and sends steering order after treatment to power setting module 3, power setting module 3 exports the data of setting power to radio-frequency module 4 according to the instruction that central processing unit 1 sends, radio-frequency (RF) tag 5 is sent data to by wireless transmission method by radio-frequency module 4, the feedback signal of received RF label 5 while of radio-frequency module 4, feedback signal is sent to central processing unit 1 by change capture module 6 and collision detection module 7 by radio-frequency module 4, the data that central processing unit 1 is passed back according to change capture module 6 regulate the instruction being sent to power setting module 3, make only to distinguish a radio-frequency (RF) tag 5 during read-write operation, the instruction that central processing unit 1 is also passed back according to change capture module 6 and collision detection module 7 controls the duty of hummer 8 and pilot lamp 9.
The preferred embodiment of the invention is, described infrared emission sensor 2 comprises the slot 23 be placed in radio-frequency (RF) tag 5, the lower socket of slot 23 is provided with infrared transmitter 21, the upper socket of slot 23 is provided with infrared remote receiver 22, for detecting whether place radio-frequency (RF) tag 5, wherein infrared remote receiver 22 is connected with central processing unit 1.
Further preferred embodiment of the present invention also has, the span of described power setting module 3 output power is 0dBm ~ 31dBm, the output power that 0dBm is corresponding is 1mW, described power setting module 3 output power adopts the even stepping of linear formula Power_0+m × STEP=Suited_Power, in formula, Power_0 is initial power, m is natural number, and Suited_Power is for obtaining rational performance number.M increases progressively, till card sender recognizes one and only recognizes a radio-frequency (RF) tag.In like manner, when recognizing more than one radio-frequency (RF) tag, then adopt mode Power_0-m × STEP=Suited_Power that stepping is successively decreased, till card sender recognizes one and only recognizes a radio-frequency (RF) tag.
As shown in Figure 2, corresponding power when recognizing first radio-frequency (RF) tag is designated as Lower_1_Tag, when will recognize second radio-frequency (RF) tag, power is designated as Higher_2_Tag, and rational performance number Suited_Power scope is: Lower_1_Tag≤Suited_Power≤Higher_2_Tag.When power strengthens, the label number of times recognized in unit interval can increase, identify that number of times is designated as Win_Count by the current unit interval, the identification number of times after Modulating Power is designated as new_Win_Count, when power being set to maximal value 31dBm, corresponding identification number of times is designated as All_Count.Win_Count value corresponding to setting Suited_Power, recognizes one and an only radio-frequency (RF) tag to ensure to stablize.The All_Count=0 when power is 31dBm, illustrate that card sender None-identified is to label, label is improper label, buzzer warning.
Further preferred embodiment of the present invention also has, the output power of described power setting module 3 adopts non-linear uniform step-by-step system, output power is carried out Automatic adjusument by adoption rate integral algorithm, Power_0+m × STEP × (m-1)=Suited_Power, the output power of described power setting module 3 increases from 0dBm, when recognizing first radio-frequency (RF) tag 5, power is designated as Lower_1_Tag, power continues to increase, when recognizing second radio-frequency (RF) tag 5, power is designated as Higher_2_Tag, rational performance number Suited_Power scope is: Lower_1_Tag≤Suited_Power≤Higher_2_Tag.
Further preferred embodiment of the present invention also has, described power setting module 3 output power adopts non-linear uniform decreasing fashion, output power is carried out Automatic adjusument by adoption rate integral algorithm, Power_0-m × STEP × (m-1)=Suited_Power, the output power of described power setting module 3 is successively decreased from 31dBm, when recognizing second radio-frequency (RF) tag 5, power is designated as Higher_2_Tag, power continues to successively decrease, when recognizing first radio-frequency (RF) tag 5, power is designated as Lower_1_Tag, rational performance number Suited_Power scope is: Lower_1_Tag≤Suited_Power≤Higher_2_Tag.
Further preferred embodiment of the present invention also has, be provided with radio-frequency (RF) tag 5 in described slot 23 and insert induction pick-up, insert induction pick-up when radio-frequency (RF) tag 5 and detected that radio-frequency (RF) tag 5 puts into slot 23, just start the power stage of radio-frequency module 4 and corresponding power setting module 3 self-adaptation output signal; Meanwhile, during the shutdown of described RFID card sender, central processing unit 1 in, store the mean value that radio-frequency module 4 exports the rational performance number Suited_Power of radio-frequency (RF) tag 5 to, for as Power_0 during RFID card sender startup next time.
The preferred technical scheme of the present invention also has, and described central processing unit 1 is the central processing unit in card sender.
Embodiment
The ultrahigh frequency radio frequency identification card sender that power adaptive of the present invention regulates, by radio communication recognition radio frequency label 5, management information is controlled by host computer.The ultrahigh frequency RFID card sender that power adaptive regulates, use for reference the classical two-layer reconstructed model of mobile database system, the high harbor of restriction wireless access, and the situation causing wireless network to be paralysed because of disaster or artificial destruction, but also can be used in the alternative wired synchronization scheme etc. of wireless synchronization technology.
Feature of the present invention is the ultrahigh frequency radio frequency identification card sender adopting radio-frequency power Automatic adjusument; RFID card sender has individual slot 23, limits the placement location of radio-frequency (RF) tag 5.Have radio-frequency (RF) tag 5 to insert induction pick-up in slot 23, be placed in slot 23 with sensing radio-frequency tag 5, if placed wherein by rfid card, then RFID card sender starts to launch radio-frequency (RF) energy; If recognize more than one radio-frequency (RF) tag 5, then reduce radio-frequency (RF) energy; If emissive power is set to minimum, still recognize more than 1 label, then hummer 8 is reported to the police; If emissive power be set to maximumly still can not recognize label, then hummer 8 is also reported to the police.
The ultrahigh frequency radio frequency identification card sender that power adaptive of the present invention regulates, the quick self-adapted convergence process of employing is: the power setting unit of radio-frequency module 4 is according to milli decibel, and span 0 ~ 31dBm, 0dBm correspond to 1mW.Adopt the even stepping of linear formula Power_0+m × STEP=Suited_Power, wherein Power_0 is initial power, and m is natural number, obtains rational performance number Suited_Power.
If initial value is 0dBm, step value is 1dBm, then speed of convergence is very slow, add along with radio-frequency (RF) tag 5 and the change of card sender antenna distance, various radio frequency parameter is all in change, when being likely increased to certain value, identifiable design is to a radio-frequency (RF) tag 5, but when operator radio-frequency (RF) tag 5 is withdrawn, but can identify the radio-frequency (RF) tag 5 of more than 2.Now reduce power again, be reduced to setting degree, again can not recognition radio frequency label 5, so repeatedly, be difficult to there is stable duty.
Therefore in order to add Fast Convergent, step-by-step system heterogeneous should be adopted, such as: Power_0+m × STEP × (m-1)=Suited_Power, as shown in Figure 2.If power increases from 0dBm, when recognizing first radio-frequency (RF) tag 5, power is designated as Lower_1_Tag (first low power value), power continues to increase, when recognizing second radio-frequency (RF) tag 5, power is designated as Higher_2_Tag (second high power value), and rational performance number Suited_Power scope should be: Lower_1_Tag≤Suited_Power≤Higher_2_Tag.
In like manner, in order to avoid Fast Convergent during reduction power, same requirement adopts progressive mode heterogeneous: Power_0-m × STEP × (m-1)=Suited_Power.
In order to the validity restrained, make output power tend towards stability, when power increases or reduce to regulate mutually, stepping multiple changes by m=1.
The present invention is based on above-mentioned algorithm, use for reference the proportional integral algorithm in Automatic Control Theory, power stage being carried out self-adaptation convergence and regulate, meanwhile, in order to adapt to practical real-time, improving stepping scheme.
In order to improve efficiency and the practicality of RFID card sender further, radio-frequency (RF) tag 5 is set in slot 23 and inserts induction pick-up, when perception has radio-frequency (RF) tag 5 to put into slot 23, the power stage and the corresponding power adaptive that just start radio-frequency module 4 regulate algorithm.Meanwhile, during shutdown, the mean value of the central value Suited_Power of repeatedly identification label convergence in the storer of central processing unit 1, as Power_0 when RFID card sender starts next time, improves the efficiency of card sender further.
By this kind of card sender, can, to make the prediction of science to rule by historical data, be that many algorithms identifies the integrated application in field at RFID.
The ultrahigh frequency radio frequency identification card sender that power adaptive of the present invention regulates, provide an open frame and supermatic radio-frequency (RF) tag 5 hair fastener environment, specialized customized development can be carried out with connected applications field based on open frame provided by the invention and assembly.The flexible and changeable lower on-site working of wireless environment can be widely used in, the read-write operation occasion of the multiple special-shaped labels such as ceramic label, hanging type label can be applicable to.
The invention is not restricted to above-mentioned embodiment, those skilled in the art make to any apparent improvement of above-mentioned embodiment or change, all can not exceed the protection domain of design of the present invention and claims.
Claims (4)
1. the ultrahigh frequency radio frequency identification card sender of a power adaptive adjustment, it is characterized in that, described card sender comprises central processing unit, infrared emission sensor, power setting module, radio-frequency module, radio-frequency (RF) tag, change capture module, collision detection module, hummer and pilot lamp, central processing unit receives the signal of infrared emission sensor, central processing unit sends and controls signal to power setting module, power setting module outputs control signals to radio-frequency module, radio-frequency module sends wireless signal to radio-frequency (RF) tag, the simultaneously wireless signal beamed back of received RF label, radio-frequency module outputs signal to change capture module and collision detection module, change capture module and collision detection module output signal are to central processing unit, central processing unit outputs control signals to hummer and pilot lamp.
2. the ultrahigh frequency radio frequency identification card sender of power adaptive adjustment as claimed in claim 1, it is characterized in that, described infrared emission sensor comprises infrared transmitter and infrared remote receiver, the slot of radio-frequency (RF) tag is provided with between described infrared transmitter and receiver, infrared transmitter is arranged on the lower socket of slot, infrared remote receiver is arranged on the upper socket of slot, and wherein infrared remote receiver is connected with central processing unit.
3. the ultrahigh frequency radio frequency identification card sender of power adaptive adjustment as claimed in claim 1, it is characterized in that, the span of described power setting module output power is 0dBm ~-31dBm.
4. the ultrahigh frequency radio frequency identification card sender of power adaptive adjustment as claimed in claim 1, it is characterized in that, described central processing unit is the central processing unit in card sender.
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| WO2006096238A1 (en) * | 2005-03-04 | 2006-09-14 | International Business Machines Corporation | Method and system for proximity tracking-based adaptive power control of radio frequency identification (rfid) interrogators |
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