CN107516054A - Can arbitrary networking radio frequency identification passive and wireless resonant transducer structure and system - Google Patents
Can arbitrary networking radio frequency identification passive and wireless resonant transducer structure and system Download PDFInfo
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- CN107516054A CN107516054A CN201610438735.1A CN201610438735A CN107516054A CN 107516054 A CN107516054 A CN 107516054A CN 201610438735 A CN201610438735 A CN 201610438735A CN 107516054 A CN107516054 A CN 107516054A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10118—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the sensing being preceded by at least one preliminary step
- G06K7/10148—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the sensing being preceded by at least one preliminary step the step consisting of dynamically tuning the resonant circuit of the interrogation device that is emitting the interrogation signal, e.g. for impedance matching inside of the interrogation device
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10326—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the very-near field type, e.g. capacitive
Abstract
The present invention propose it is a kind of can arbitrary networking radio frequency identification passive and wireless resonant transducer structure and system, including requestor and sensor tag；In inquiry charge cycle T1, requestor transmitting radio-frequency queries signal, sensor tag receives the radio-frequency queries signal of requestor transmitting, and coupling inquiry signal energy is maximized under impedance matching condition, is charged, now retroreflective signs are minimum；In sensing output cycle T 2, sensor tag works comprehensively, modulator control modulation switch in label is turned off and closed according to the rule of encoded signal, matching and the mismatch of matching impedance and antenna impedance are realized respectively, so as to which reflected signal strength receives wireless sensing signal according to encoded signal rule and changing features, requestor.Present invention inquiry distance is remote, can wirelessly address inquiry.
Description
Technical field
The invention belongs to passive wireless sensor technical field, and in particular to a kind of radio frequency identification passive and wireless resonance sensor
Device label and system.
Background technology
Passive wireless sensor is particularly suitable under inconvenient line, the specific occasion that can not be contacted, can not change power supply
Use.Passive wireless sensor is usually to use electromagnetic wave wireless poll sensor, encourages it to produce sensing output signal and passes through
Electromagnetic wave wirelessly transfers back to inquiry end, and inquiry end obtains sensor parameter information by analyzing the feature of sensing output signal.
Current passive wireless sensor is mainly realized using surface acoustic wave sensor.The sensing of surface acoustic wave sensor is looked into
Ask signal (inquiring about pumping signal of the end wireless transmission to surface acoustic wave sensor) and sensing output signal (i.e. surface acoustic wave biography
Sensor passes back to the signal at inquiry end) in same frequency range, there is identical frequency, or frequency phase-difference is close.If realize
The wireless addressing function of surface acoustic wave sensor, then the parameter of each surface acoustic wave device sensor must be otherwise varied.For example,
For SAW resonator, addressing can only be realized by the difference of resonant frequency, the resonant frequency of each sensor is different,
It is required that design parameter with regard to different, both add the complexity of senser element, will also result in the difference of sensing capabilities.
The acquisition of surface acoustic wave sensor wireless sensing signal is realized by following two processes：1) sensing inquiry：By looking into
End transmitting inquiry electric wave, excitation surface acoustic wave sensor work are ask, surface acoustic wave sensor is accumulated necessarily in the form of mechanical energy
Oscillation energy；2) transducing signal obtains：Signal interruption is now inquired about, that is, it is zero to inquire about signal, surface acoustic wave sensor accumulation
Mechanical oscillation signal switch to electromagnetic wave signal pass back inquiry end.Current existing passive wireless surface acoustic wave sensor is wirelessly looked into
Ask apart from extremely limited, it is difficult to increase substantially, a major reason is exactly, at present the Q values highest of SAW resonator
Have 2000 or so.
Radio frequency identification (RFID) system of hyperfrequency also realizes non-contacting information transfer using Electromagnetic Wave Propagation coupling.Read
Write device and provide RF energy for label, label antenna receives RF energy and the electronic code information of label is passed through into backscattering
The mode of debugging is sent to read write line, and maximum reading/writing distance is more than 1m, typically up to 3~8m.The data of ultrahigh frequency RFID system
Thousands of individual labels disposably can be read up to more than 600kbit/s in traffic rate, at present traffic control, logistics management,
Apply in the fields such as asset management.But due to there is no physical parameter sensing unit inside ultra-high frequency RFID label, hyperfrequency at present
RFID label tag can not still be used with as sensor.
The content of the invention
The passive resonant sensor label that distance is remote, can wirelessly address inquiry is inquired about it is an object of the invention to provide a kind of
And sensing system.
In order to solve the above-mentioned technical problem, the present invention provide it is a kind of can arbitrary networking radio frequency identification passive and wireless resonance pass
Sensor label, including sensor side antenna, radio-frequency front-end, power circuit, oscillating circuit, sensing element, encoder, memory with
And modulator；The oscillating circuit and sensing element composition oscillator；The radio-frequency front-end includes matching impedance and load is modulated
Switch；The load modulation switch controls matching and the mismatch of the matching impedance and antenna impedance；The power circuit is to coupling
Close signal and carry out rectification and storage, when the energy of power circuit storage exceedes threshold value, oscillator in trigger sensor label,
Encoder and modulator work；Sensing element sensing parameter to be measured, a part of the sensing element as oscillating circuit,
Changing features caused by parameter effect to be measured is lower change the frequency for causing oscillating circuit outputting oscillation signal；The oscillating circuit
The oscillator signal for carrying parameter information to be measured is delivered into encoder as encoded clock signal；The encoder is read from memory
The sensor tag address prestored or id information are taken, and encoded signal is produced under the control of encoded clock signal, is controlled
Modulator works；The encoded signal includes sensor address or the frequency information of id information and oscillator signal；The modulation
Device control modulation switch is turned off and closed according to the rule of encoded signal, realizes of matching impedance and antenna impedance respectively
With (opening a disconnection) and mismatch (switch closure).During impedance matching, the energy that sensor side antenna receives obtains maximizing coupling,
The wireless signal for being now reflected back sensor query device end is minimum；During impedance mismatching, the energy very little of sensor side antenna reception,
The wireless signal for being now reflected back sensor query device end is maximum.So as to load the disconnection of modulation switch and closure causes to inquire about
The wireless sensing signal that device receives has the change of strong (1) weak (0) state.
Further, the work period includes inquiry charge cycle T1 and sensing output cycle T 2；Sensor tag fills in inquiry
Electric cycle T 1 receives the radio-frequency queries signal of upper stream queries device transmitting, and sensing export the reflection wireless sensing signal of cycle T 2 to
Upper stream queries device；Inquire about between charge cycle T1 and sensing output cycle T 2 without interval.
Further, the power circuit is by diode voltage multiple circuit, rectification circuit, storage capacitance and power management
Circuit forms；In inquiry charge cycle T1, the radio-frequency queries signal of reception is converted to direct current energy and stored by power circuit
Into storage capacitance, when the voltage at storage capacitance both ends reaches certain numerical value, Triggered Oscillation circuit work and be oscillating circuit,
Frequency divider, encoder, modulator and memory power supply.
Further, when loading modulation switch disconnection, the input resistant matching of sensor side antenna impedance and requestor；When
When loading modulation switch closure, the input impedance mismatch of sensor side antenna impedance and requestor.
Further, the oscillating circuit is door oscillating circuit, Pierce oscillator circuit either Miller oscillating circuit or RLC
One kind in oscillating circuit.
Further, the sensor tag also includes frequency divider, oscillator signal conduct after frequency dividing of oscillator output
Encoded clock signal.
The present invention also proposes a kind of sensing system using the sensor tag networking, including requestor and the biography
Sensor label, in inquiry charge cycle T1, requestor transmitting radio-frequency queries signal, sensor tag receives requestor transmitting
Radio-frequency queries signal, coupling inquiry signal energy is maximized under impedance matching condition, is charged, now retroreflective signs pole
It is small；In sensing output cycle T 2, sensor tag works comprehensively, and the modulator control modulation switch in label is believed according to coding
Number rule turn off and close, the matching (opening a disconnection) and mismatch for realizing matching impedance and antenna impedance respectively (switch
Closure), so as to which reflected signal strength receives wireless sensing signal according to encoded signal rule and changing features, requestor.
Further, the requestor is by DSP, microwave source, requestor end antenna, transceiver insulation device, receiving channel, vibration
Device, clock and external interface composition；The transceiver insulation device be used for the transmitting-receiving of radio-frequency queries signal and wireless sensing signal every
From；The microwave source produces microwave signal under DSP controls, by externally launching through requestor end antenna after transceiver insulation device
Go；Wireless sensing signal is sent to receiving channel, receiving channel filtering, amplification, detection and demodulation and decoding through transceiver insulation device
After send DSP, DSP obtains the id information with sensor tag and the vibration of oscillator output after carrying out information extraction and processing
The frequency values of signal.
Further, the receiving channel includes filter circuit, amplifying circuit, detecting circuit and demodulation and decoding circuitry.
Compared with prior art, its remarkable advantage is the present invention：
(1) present invention can use the passive resonant sensor of optional frequency to form passive wireless sensor, that is, realize any
The wireless poll of passive resonant sensor.By the passive resonant sensor from high q-factor, passive and wireless biography can be greatly improved
The wireless poll performance of sensor, so as to improve the actual sensing capabilities of sensor；(2) present invention can also use resistor-type, electric capacity
The sensing element that type, inductive type etc. can form RLC oscillating circuits forms resonant transducer, realizes any passive resonant sensor
Wireless poll.
Brief description of the drawings
Fig. 1 is the structural representation of passive and wireless resonance sensor systems of the present invention；
Fig. 2 is sensor tag work period schematic diagram；
Fig. 3 is the structural representation of sensor tag；
Fig. 4 is that passive and wireless resonance sensor systems of the present invention are illustrated using principle of the quartz resonator as sensing element
Figure；
Fig. 5 is coded system and the waveform relationship signal of wireless senser tag addresses and oscillator signal resonant frequency
Figure.
Embodiment
It is readily appreciated that, according to technical scheme, in the case where not changing the connotation of the present invention, this area
Those skilled in the art can imagine the present invention can arbitrary networking radio frequency identification passive and wireless resonant transducer and system
Numerous embodiments.Therefore, detailed description below and accompanying drawing are only the exemplary illustrations to technical scheme, and
It is not to be construed as the whole of the present invention or is considered as limitation or restriction to technical solution of the present invention.
As depicted in figs. 1 and 2, radio frequency identification wireless sensor system includes requestor and sensor tag, and it has two
The individual work period：Charge cycle T1 and sensing output cycle T 2 are inquired about, charge cycle T1 is preceding for inquiry, and sensing output cycle T 1 exists
Afterwards, without interval between two cycles.In inquiry charge cycle T1, requestor produces radio-frequency queries signal and (supplied comprising energy
Signal), sensor tag receives the radio-frequency queries signal of requestor transmitting；In sensing output cycle T 2, sensor tag is anti-
Wireless sensing signal is penetrated, requestor receives wireless sensing signal, demodulates the parameter information measured by sensor.
Requestor is similar with the requestor structure of existing RFID system, mainly by DSP, microwave source, requestor end antenna, receipts
Send out isolator, receiving channel, oscillator, clock and external interface composition.In inquiry charge cycle T1, microwave source is in DSP
Control is lower to produce microwave signal, is believed by externally launching through requestor end antenna after transceiver insulation device as radio-frequency queries
Number, microwave signal provides microwave energy and inquiry signal for sensor tag.In sensing output cycle T 2, requestor end antenna
The echo-signal of sensor tag, i.e. wireless sensing signal are received, receiving channel, receiving channel filter are sent to through transceiver insulation device
DSP, DSP is sent to be obtained after carrying out information extraction and processing with sensor tag after ripple, amplification, detection and demodulation and decoding
The frequency values of id information and the oscillator signal of oscillator output.Exist one by one between the frequency values of oscillator signal and parameter to be measured
Corresponding relation.
The receiving channel includes filter circuit, amplifying circuit, detecting circuit and demodulation and decoding circuitry.
The DSP is the working centre of requestor, and the software that DSP is implanted into completes transmitting-receiving control, digital independent and processing
And the task such as external communication and networking.
The transceiver insulation device is used for the transceiver insulation of radio-frequency queries signal and wireless sensing signal, prevents transmission channel
Signals leakiness to receiving channel, transceiver insulation device can be circulator, or leakage signal canceller.
As shown in figure 3, sensor tag is mainly by sensor side antenna, radio-frequency front-end, power circuit, oscillating circuit, quick
Sensing unit, frequency divider, encoder, memory and modulator composition.
The radio-frequency front-end mainly completes sensor side antenna and the impedance matching of load, realizes the maximization coupling of energy
Close, so that power circuit can obtain enough microwave energies.Radio-frequency front-end is configured with load modulation switch, when load is adjusted
When system switches off, sensor side antenna impedance matches completely with the input impedance of requestor, the energy that sensor side antenna receives
Maximization coupling is measured, the wireless sensing signal now launched is minimum；When loading modulation switch closure, sensor side antenna
Impedance and the input impedance mismatch of requestor, the wireless sensing signal now launched are maximum.Load the disconnected open and close of modulation switch
Closing the wireless sensing signal for causing requestor to receive has the change of strong (1) weak (0) state.
The power circuit is mainly by diode voltage multiple circuit, rectification circuit, storage capacitance and power management electricity
Road forms.In inquiry charge cycle T1, power circuit converts microwave energy into direct current energy and stored into storage capacitance,
When the voltage at storage capacitance both ends reaches certain numerical value, trigger sensor labeling task, i.e. Triggered Oscillation circuit work and are
Oscillating circuit, frequency divider, encoder, modulator and memory power supply, now sensor tag, which enters, senses output cycle T 2.
Oscillating circuit collectively forms oscillator, the frequency and sensing element of the oscillator signal of oscillator output with sensing element
Relevant, when sensing element experiences parameter change to be measured, the frequency of oscillator signal can change.
The sensing element can be the various sensing elements being placed in oscillating circuit, it is characterized in that, sensing element tool
There are resistance R, electric capacity C or inductance L characteristic.Treat to cause when the change of sensor parameter to be measured cause resistance R, electric capacity C,
Inductance L change, or cause R, L, C or rlc circuit to form the change of impedance, so as to cause the vibration that oscillating circuit exports
The change that the frequency of signal occurs.In this case, (i.e. oscillating circuit is humorous for the frequency of the oscillator signal of oscillating circuit output
Vibration frequency) with sensor parameter to be measured parameter to be measured one-to-one relation be present.For example, sensing element can be based on quartz
The temperature sensor of resonator, or the various sensors that QCM etc. is formed based on quartz-crystal resonator.It is quick
Sensing unit can also be magnetic resistance, magnetoimpedance or capacitance humidity sensing element (i.e. the capacitance of sensing element changes with humidity).It is right
Above-mentioned sensing element is answered to illustrate, the resonant frequency for the oscillator that quartz-crystal resonator is formed with oscillating circuit depends primarily on stone
English crystal resonator；Peripheral cell using the element of magnetic resistance, magnetic impedance element and capacitance variations as oscillating circuit, then shake
It is relevant with the numerical value (such as the resistance value of magnetoresistive element, capacitance of capacity cell etc.) of these elements to swing the resonant frequency of device,
And there is one-to-one relationship in the numerical value of these elements with parameter to be measured.
The oscillating circuit can be various low-power consumption oscillating circuit, such as door oscillating circuit, Pierce oscillator circuit,
Miller oscillating circuit etc..
The oscillator signal of oscillator output is used as encoded clock signal after frequency dividing, can not also divide, directly as
Encoded clock is believed), encoder reads address or the id information of the sensor tag prestored from memory, and in coding
The control of clock signal is lower to produce encoded signal, control modulator work.
The address of the memory storage sensor tag or id information, can be EEPROM (the read-only storages of electric erasable
Device), it is read-only not write.
The output waveform of the encoder includes two parts information, and Part I is the address of sensor tag or ID letters
Breath, Part II be oscillator signal frequency information, such as work out this part numeric data code be 0101010101010101, then
The waveform of data after demodulation is consistent with clock waveform period/frequency.
The modulator is load modulation principle and modulator composition one in load modulator, with existing RFID system
Cause.The modulating tube (such as MOSFET) that the coding waveforms that encoder is sent are added in modulator, controls the load of radio-frequency front-end
Modulation switch makes the input impedance of requestor end antenna impedance and requestor exist with the beat "off" and " closed " of coding waveforms
Change between matching and mismatch, so as to which the microwave power that requestor launches is maximized (counterpart impedance matching) and minimizes
(counterpart impedance mismatch) absorbs；Corresponding, the wireless sensing signal for being transmitted into requestor is minimized (0 state, counterpart impedance
With) and maximize (1 state, counterpart impedance mismatch).After requestor receives the wireless sensing signal of sensor tag loopback,
The data clock information of coded data is demodulated, so that sensor tag address corresponding to further obtaining and oscillating tank frequency
Rate.
Embodiment
With reference to Fig. 4, in the present embodiment, oscillating circuit uses door oscillating circuit, and sensing element uses quartz resonance sensor；
By door oscillating circuit and quartz resonance sensor group into oscillator；Correspondingly matching impedance ZLLoad modulation switch S and form radio frequency
Front end；Power circuit is formed by rectification circuit, storage capacitor and electric power management circuit.Assuming that ZAFor sensor side antenna impedance, ZL
For the input impedance of sensor tag.
In inquiry charge cycle T1, load modulation switch S disconnects, and sensor side antenna is in load matched state, looked into
Ask the microwave power that device launches and be maximized absorption, be fed back into the wireless sensing signal minimum of requestor, sensor tag
Radio-frequency queries signal is absorbed, the signal is charged after rectifier circuit rectifies for storage capacitance, and voltage is sent into power management
Circuit, when the voltage Vdd at electric capacity both ends is sufficiently large, the work of electric power management circuit trigger generator, sensor tag, which enters, to be passed
Sense output cycle T 2, electric power management circuit export four road voltages and supply door oscillating circuit, frequency divider, encoder and tune respectively simultaneously
Device processed uses.In sensing output cycle T 2, modulator control loads modulation switch S with oscillator signal or the frequency of its fractional frequency signal
Rate periodically disconnect and close, and when loading modulation switch S closures, ability sensor side antenna load is short-circuited, now
The wireless sensing signal that requestor receives is most strong, when loading modulation switch S closures, as previously shown, what requestor received
Wireless sensing signal is most weak.In sensing output cycle T 2, the working condition of sensor tag is power consumption process, causes storage capacitance
The voltage Vdd at both ends is reduced, and when voltage Vdd is reduced to certain numerical value and when can not maintain working condition, restarts charging process, such as
This goes round and begins again, and system maintains working condition.
Fig. 5 gives the illustration of the coded system and waveform relationship of sensor tag address and resonant frequency.Fig. 5
In, address and frequency code data are deposited in memory, and preceding four figures represents address according to 1011, some positions below
0101010101 ... represents frequency code.Oscillation signal frequency is fr, and fr is determined by the resonant frequency of resonant transducer.Vibration letter
Number frequency is after 4 frequency dividings, as coded data clock, encoded signal corresponding to control encoder output.Requestor demodulates
Go out encoded signal can inverse go out the value of resonant frequency.
Claims (9)
1. it is a kind of can arbitrary networking radio frequency identification passive and wireless resonant transducer label, it is characterised in that including sensor side
Antenna, radio-frequency front-end, power circuit, oscillating circuit, sensing element, encoder, memory and modulator；The oscillating circuit
Oscillator is formed with sensing element；
The radio-frequency front-end includes matching impedance and load modulation switch；The load modulation switch control the matching impedance with
The matching of antenna impedance and mismatch；
The power circuit carries out rectification and storage to coupled signal, when the energy of power circuit storage exceedes threshold value, triggering
Oscillator, encoder and modulator work；
The sensing element senses parameter to be measured；
The oscillator signal for carrying parameter information to be measured is delivered to encoder as encoded clock signal by the oscillating circuit；
The encoder reads the sensor tag address prestored or id information from memory, and in encoded clock signal
Control under produce encoded signal, control modulator work；The encoded signal includes sensor address or id information and shaken
Swing the frequency information of signal；
After the modulator modulates encoded signal, launched under the control of load modulation switch by sensor side antenna
Go.
2. as claimed in claim 1 can arbitrary networking radio frequency identification passive and wireless resonant transducer label, it is characterised in that work
Make the cycle comprising inquiry charge cycle T1 and sense output cycle T 2；Sensor tag receives upstream in inquiry charge cycle T1 and looked into
The radio-frequency queries signal for asking device transmitting is charged, and is exported cycle T 2 in sensing and reflected wireless sensing signal to upper stream queries
Device；Inquire about between charge cycle T1 and sensing output cycle T 2 without interval.
3. as claimed in claim 2 can arbitrary networking radio frequency identification passive and wireless resonant transducer label, it is characterised in that institute
Power circuit is stated to be made up of diode voltage multiple circuit, rectification circuit, storage capacitance and electric power management circuit；Filled in inquiry
In electric cycle T 1, the radio-frequency queries signal of reception is converted to direct current energy and stored into storage capacitance by power circuit, when depositing
When the voltage that storing up electricity holds both ends reaches certain numerical value, Triggered Oscillation circuit works and is oscillating circuit, frequency divider, encoder, tune
Device and memory power supply processed.
4. as claimed in claim 2 can arbitrary networking radio frequency identification passive and wireless resonant transducer label, it is characterised in that when
When loading modulation switch disconnection, the input resistant matching of sensor side antenna impedance and requestor；When load modulation switch closure
When, the input impedance mismatch of sensor side antenna impedance and requestor.
5. as claimed in claim 2 can arbitrary networking radio frequency identification passive and wireless resonant transducer label, it is characterised in that institute
Oscillating circuit is stated as one kind in door oscillating circuit, Pierce oscillator circuit, Miller oscillating circuit or RLC oscillating circuits.
6. as claimed in claim 2 can arbitrary networking radio frequency identification passive and wireless resonant transducer label, it is characterised in that also
Including frequency divider, the oscillator signal of oscillator output is used as encoded clock signal after frequency dividing.
7. a kind of usage right requires the sensing system of sensor tag networking described in 1-6, it is characterised in that including requestor
With the sensor tag；In inquiry charge cycle T1, requestor transmitting radio-frequency queries signal, sensor tag receives inquiry
The radio-frequency queries signal of device transmitting and the energy that coupled RF inquiry signal is maximized under impedance matching condition；Exported in sensing
In cycle T 2, the modulator control modulation switch in sensor tag is turned off and closed according to the changing rule of encoded signal
Close, so as to the wireless sensing signal that reflected signal strength is changed according to encoded signal rule, requestor receives described wireless
Transducing signal.
8. sensing system as claimed in claim 7, it is characterised in that the requestor is by DSP, microwave source, requestor end day
Line, transceiver insulation device, receiving channel, oscillator, clock and external interface composition；The transceiver insulation device is used for radio-frequency queries
The transceiver insulation of signal and wireless sensing signal；The microwave source produces microwave signal under DSP controls, passes through transceiver insulation device
Externally launch by requestor end antenna；Wireless sensing signal delivers to DSP through transceiver insulation device and receiving channel, and DSP enters
The frequency values with sensor tag information and oscillator signal are obtained after row information processing.
9. sensing system as claimed in claim 8, it is characterised in that the receiving channel include filter circuit, amplifying circuit,
Detecting circuit and demodulation and decoding circuitry.
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| CN110176941A (en) * | 2019-07-05 | 2019-08-27 | 电子科技大学 | One kind is wirelessly without direct current heat transfer agent transmission circuit |
| CN110176941B (en) * | 2019-07-05 | 2024-02-06 | 电子科技大学 | Wireless direct-current-free sensing information transmission circuit and implementation method |
| CN113191475A (en) * | 2021-05-21 | 2021-07-30 | 上海坤锐电子科技有限公司 | Passive return sensor information circuit and electronic tag system |
| CN113191475B (en) * | 2021-05-21 | 2023-10-20 | 上海坤锐电子科技有限公司 | Circuit for passively returning sensor information and electronic tag system |
| CN117394028A (en) * | 2023-11-17 | 2024-01-12 | 湖南恒茂信息技术有限公司 | Intelligent antenna device for wireless networking and control method thereof |
| CN117394028B (en) * | 2023-11-17 | 2024-04-12 | 湖南恒茂信息技术有限公司 | Intelligent antenna device for wireless networking and control method thereof |
| CN117579438A (en) * | 2024-01-16 | 2024-02-20 | 浙江龙感科技有限公司成都分公司 | Remote passive microwave direct-drive self-adaptive sensing communication system and method |
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