CN105303207B - A kind of tag communication system based on analog-to-digital conversion backscattering - Google Patents
A kind of tag communication system based on analog-to-digital conversion backscattering Download PDFInfo
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- CN105303207B CN105303207B CN201510695360.2A CN201510695360A CN105303207B CN 105303207 B CN105303207 B CN 105303207B CN 201510695360 A CN201510695360 A CN 201510695360A CN 105303207 B CN105303207 B CN 105303207B
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Abstract
The present invention relates to tag communication system, specially a kind of tag communication system based on analog-to-digital conversion backscattering, including hybrid tag and mixing reader-tag, WISP sensing platforms are all integrated with hybrid tag and mixing reader-tag；Reader circuitry is further included in mixing reader-tag, reader circuitry includes microprocessor, battery, first switch S1, RF switch, the antenna of model MSP430；Analog-to-digital conversion backscatter circuit is all also integrated with hybrid tag and mixing reader-tag, analog-to-digital conversion backscatter circuit includes digital RF field-effect tube Q1, antenna, RF switch So and temperature sensor.The present invention by WISP sensing platforms, with reference to analog-to-digital conversion backscattering and reader functionality, solve the problems, such as that information is not smooth, label communication efficiency is low, label communication power consumption is big between label well, the development to passive label communication system plays good impetus.
Description
Technical field
The present invention relates to tag communication system, is specially a kind of tag communication system based on analog-to-digital conversion backscattering.
Background technology
In recent years, it is upper to politics and economical under the fast development of Radio Frequency Identification Technology, it is lower to society and life, label
Identification technology increasingly occupies critical role in national life.Although Radio Frequency Identification Technology development is ripe in China, but
The presence of reader not only increases energy consumption, also forms barrier to communication between label.According to investigations, passive tag systems consume energy
Mainly produced by reader；Additionally, due to the presence of reader, information is not smooth between label, causes label communication efficiency to drop
It is low.Therefore, realize the communication between label, improve the reliability of label communication, reduce quarter the problems such as power consumption of label communication not
Rong Huan.
The content of the invention
Reader energy consumption is greatly, communicate not smooth and label between label in order to solve in existing passive tag systems by the present invention
Between communication efficiency it is low the problem of, there is provided a kind of tag communication system based on analog-to-digital conversion backscattering.
The present invention adopts the following technical scheme that realization：A kind of label communication system based on analog-to-digital conversion backscattering
System, including hybrid tag and mixing reader-tag, it is flat to be all integrated with WISP sensings in hybrid tag and mixing reader-tag
Platform；
Reader circuitry is further included in mixing reader-tag, reader circuitry includes the microprocessor of model MSP430
Device, the ground terminal ground connection of microprocessor, power end connected by first switch S1 with battery, the output terminal of microprocessor and anti-phase
The input end grounding of device U0, the output terminal of phase inverter U0 are connected with the control terminal of RF switch, the output terminal of microprocessor also and
The control terminal connection of RF switch, the power end of RF switch are connected with the power end of microprocessor, the output terminal of RF switch
Connected with the antenna in WISP sensing platforms, the ground terminal ground connection of RF switch；
Analog-to-digital conversion backscatter circuit is all also integrated with hybrid tag and mixing reader-tag, analog-to-digital conversion is reverse
Scattering circuit includes digital RF field-effect tube Q1, the antenna in the drain electrode of digital RF field-effect tube Q1 and WISP sensing platforms
Digital end connection, source electrode ground connection, the analog end of antenna connect by RF switch So with one end of temperature sensor, temperature biography
The other end ground connection of sensor.
Hybrid tag and mixing reader-tag can be operated in digit reverse backscatter mode and simulated inverse backscatter mode,
Digit reverse backscatter mode is default behavior, defers to the work of 2 RFID agreements of EPC Gen, and RF switch So is off shape
State, the connection of break-off signal sensor and antenna；In simulated inverse backscatter mode, RF switch So is switched on, temperature sensing
Device is connected to antenna.WISP sensing platforms in label are a flexible radio frequency powered platforms, and microcontroller is integrated with platform
Device, sensor array and antenna etc., microprocessor control RF switch So and digital radiofrequency field effect pipe Q1, WISP in platform
Sensing platform can perceive environment and RF switch So is controlled, and can select reversely to dissipate by adjusting external radio frequency field
Emission mode.Analog-to-digital conversion backscatter circuit goes selection data-transmission mode, simulation or numeral according to the suitable degree of environment
Pattern, drastically increases efficiency of transmission, so as to also improve transmission quality, the efficiency of single-mode transmission data carries than ever
It is several times high.
The function of reader is integrated with mixing reader-tag so that need not exist in tag communication system and individually read
Device is read, reduces the energy consumption in tag communication system；In addition must be transmitted across before tag communication system by reader transmission
In journey it is possible that phenomena such as packet loss, and direct progress label communication now, communication quality and efficiency can be improved.
A kind of tag communication system based on analog-to-digital conversion backscattering, by WISP sensing platforms, with reference to analog-to-digital conversion
Backscattering function, energy is absorbed by environment, the adjusting and conversion of simulation and digital communication is carried out according to environment, well solution
Determine the problem of information is not smooth, label communication efficiency is low, label communication power consumption is big between label, to passive label communication system
Development play good impetus.
Brief description of the drawings
Fig. 1 is the schematic diagram of WISP sensing platforms.
Fig. 2 is reader circuitry schematic diagram.
Fig. 3 is temperature difference detection circuit schematic diagram.
Fig. 4 is analog-to-digital conversion backscatter circuit schematic diagram.
Embodiment
A kind of tag communication system based on analog-to-digital conversion backscattering, including hybrid tag and mixing reader-tag,
WISP sensing platforms are all integrated with hybrid tag and mixing reader-tag；
Reader circuitry is further included in mixing reader-tag, reader circuitry includes the microprocessor of model MSP430
Device, the ground terminal ground connection of microprocessor, power end connected by first switch S1 with battery, the output terminal of microprocessor and anti-phase
The input end grounding of device U0, the output terminal of phase inverter U0 are connected with the control terminal of RF switch, the output terminal of microprocessor also and
The control terminal connection of RF switch, the power end of RF switch are connected with the power end of microprocessor, the output terminal of RF switch
Connected with the antenna in WISP sensing platforms, the ground terminal ground connection of RF switch；
Analog-to-digital conversion backscatter circuit is all also integrated with hybrid tag and mixing reader-tag, analog-to-digital conversion is reverse
Scattering circuit includes digital RF field-effect tube Q1, the antenna in the drain electrode of digital RF field-effect tube Q1 and WISP sensing platforms
Digital end connection, source electrode ground connection, the analog end of antenna connect by RF switch So with one end of temperature sensor, temperature biography
The other end ground connection of sensor.
All include temperature difference detection circuit in hybrid tag and mixing reader-tag, temperature difference detection circuit including sensor,
Single device U1 is put in first computing, single device U2 is put in the second computing, single device U3 and four-operational amplifier U4 is put in the 3rd computing, WISP sensings
Antenna in platform is connected with the anode of first crystal diode D1, and the cathode of first crystal diode D1 passes through the first capacitance C1
Ground connection, the cathode of first crystal diode D1 are connected by the end of oppisite phase of first resistor R1 and the first operational amplifier U1, and first
The in-phase end ground connection of operational amplifier U1, anode of the end of oppisite phase also with the 3rd crystal diode D3 connect, the 3rd crystal diode
The output terminal of the cathode of D3 and the first operational amplifier U1 connect, and the output terminal of the first operational amplifier U1 also passes through 3rd resistor
The end of oppisite phase of R3 and the 3rd operational amplifier U3 connect, the anode connection of the output terminal of sensor and the second crystal diode D2,
The cathode of second crystal diode D2 is grounded by the second capacitance C2, and the cathode of the second crystal diode D2 also passes through second resistance
The end of oppisite phase of R2 and the second operational amplifier U2 connect, the in-phase end ground connection of the second operational amplifier U2, the second operational amplifier
The anode of the end of oppisite phase of U2 and the 4th crystal diode D4 connect, the cathode and the second operational amplifier of the 4th crystal diode D4
The output terminal connection of U2, the same phase that the output terminal of the second operational amplifier U2 passes through the 4th resistance R4 and the 3rd operational amplifier U3
End connection, the end of oppisite phase of the 3rd operational amplifier U3 are connected by the 5th resistance R5 with output terminal, and in-phase end passes through the 6th resistance
R6 is grounded, the in-phase end connection of the output terminal and four-operational amplifier U4 of the 3rd operational amplifier U3, four-operational amplifier
The end of oppisite phase of U4 is grounded by the 7th resistance R7, the 3rd capacitance C3.
Temperature difference detection circuit is made of envelope detected circuit, subtraction circuit and threshold circuit, and envelope detected circuit includes
Antenna, sensor, diode, resistance and capacitance, the effect of envelope detected circuit are to track the envelope of received signal, at the same time
Carrier frequency is eliminated, which uses passive device, therefore inherently super low-power consumption.Diode in circuit fills
Work as switch, it is allowed to which electric current flows forward rather than reversely；Capacitor element stores electric charge；Resistance adjustment electric current flowing, passes through setting
The suitable value of these analog elements, it is possible to remove carrier frequency；Subtraction circuit puts single device U1, the second fortune including the first computing
Single device U2 is put in calculation, single device U3 is put in the 3rd computing, and subtraction circuit is the value that the amplitude that will be received on antenna and local sensor measure
Carry out division arithmetic；Threshold circuit includes four-operational amplifier U4, and the purpose of threshold circuit is threshold value and the ratio of sensor
It is compared.By the way that compared with threshold value, it can weigh difference of the temperature two positions.In a higher level,
The average value for two voltage levels that threshold circuit calculates, when input is more than threshold value, 1 bit of output；Otherwise 0 bit is exported, is
Calculate the average value, before using an envelope detector, the resistor and the particular value of capacitor that we use calculate
The average value of signal envelope.Temperature difference detection circuit is by the design of logarithmic transformation circuit, by the subtraction circuit of huge energy consumption
The logarithmic temperature difference detection circuit of low-power consumption is changed into, dramatically saves on the consumption of energy.
Claims (1)
1. a kind of tag communication system based on analog-to-digital conversion backscattering, it is characterised in that read including hybrid tag and mixing
WISP sensing platforms are all integrated with device label, hybrid tag and mixing reader-tag；
Reader circuitry is further included in mixing reader-tag, reader circuitry includes the microprocessor of model MSP430, micro-
The ground terminal ground connection of processor, power end are connected by first switch S1 with battery, the output terminal and phase inverter U0 of microprocessor
Input end grounding, the output terminal of phase inverter U0 connects with the control terminal of RF switch, and the output terminal of microprocessor is also and radio frequency
The control terminal connection of switch, the power end of RF switch connect with the power end of microprocessor, the output terminal of RF switch with
Antenna connection in WISP sensing platforms, the ground terminal ground connection of RF switch；
Analog-to-digital conversion backscatter circuit, analog-to-digital conversion backscattering are all also integrated with hybrid tag and mixing reader-tag
Circuit includes digital RF field-effect tube Q1, the number of the antenna in the drain electrode of digital RF field-effect tube Q1 and WISP sensing platforms
Word end connects, and source electrode ground connection, the analog end of antenna is connected by RF switch So with one end of temperature sensor, temperature sensor
The other end ground connection.
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| CN105303207B true CN105303207B (en) | 2018-05-01 |
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| US6198392B1 (en) * | 1999-02-10 | 2001-03-06 | Micron Technology, Inc. | Communications system and method with A/D converter |
| CN101604021A (en) * | 2009-07-09 | 2009-12-16 | 复旦大学 | A kind of localization method of radio frequency identification system and device |
| CN201638246U (en) * | 2009-08-19 | 2010-11-17 | 中兴通讯股份有限公司 | Ultrahigh-frequency semi-active radio frequency identification label |
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