CN106774825A - A kind of contactless gesture identification method and system - Google Patents
A kind of contactless gesture identification method and system Download PDFInfo
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- CN106774825A CN106774825A CN201611003899.8A CN201611003899A CN106774825A CN 106774825 A CN106774825 A CN 106774825A CN 201611003899 A CN201611003899 A CN 201611003899A CN 106774825 A CN106774825 A CN 106774825A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/017—Gesture based interaction, e.g. based on a set of recognized hand gestures
Abstract
The invention discloses a kind of contactless gesture identification method and system.Wherein, the system includes signal transmitting and receiving module, injection phase-locking quadrature receiving module and gesture recognition module.The present invention launches wireless signal and receives echo-signal by signal transmitting and receiving module to detected material；The phase of the wireless signal is locked by injection phase-locking quadrature receiving module, quadrature demodulation is carried out to the wireless signal after the echo-signal and lock phase, the second baseband signal that the first baseband signal and quadrature branch demodulation that output in-phase branch demodulation is obtained are obtained；And then the moving direction of the detected material is judged according to the change of the signal amplitude of first baseband signal and the second baseband signal by gesture recognition module.Contactless gesture identification is achieved in, the present invention reduces cost without camera and the algorithm of complexity, applied widely.
Description
Technical field
The present invention relates to gesture identification method field, more particularly to a kind of contactless gesture identification method and system.
Background technology
Compared to the gesture identification method of contact, it is more freely empty that contactless recognition methods can allow people to have
Between do gesture, and this is also best's machine interactive mode.In contactless gesture identification method, based on re-transmission nothing
Line signal of communication and Doppler radar technique gesture identification method, had more advantages than former method.It uses microwave
Technology, with preferable penetrability；Signal source additionally need not be actively produced, with relatively low power consumption；Using the wireless of interior
Signal of communication, can avoid many internal interferences；Addition retransmission mechanism and coupled apparatus come the echo-signal that is separately received and
The wireless communication signals for receiving；Introduce injection lock phase Quadrature receiver（ILQR）To ensure sensitivity higher, it is to avoid more numerous
The steps such as trivial encoding and decoding.Therefore, there is larger application space in future, it is specific as follows：
(1) in field of mobile equipment：Following world is the world of Internet of Things, the market of mobile terminal be it is very big, particularly
The market of smart mobile phone.If gesture wireless operated equipment can be utilized at a distance, this can allow the people to have more preferable experience sense, and
And it is more convenient to cause that people operate.
(2) field of play：As people are to game experiencing requirement more and more higher, following game is not only by mouse screen
Curtain can just meet human needs, be more man-machine interaction.Therefore, if using this technology, Ke Yiyuan on a hardware platform
The gesture motion of the detection identification people of distance, people just be free to carry out man-machine interaction, have more preferable game experiencing sense.
(3) smart home：More intelligent control system, if can free control system at a distance running, meeting
The life for giving people usually brings incomparable comfort.If control smart machine can be used gesture at a distance, also just without
Too many movement, as long as making a motion gesture, with regard to energy control device, this normal life that can be given people brings great convenience.
Existing non-contact gesture identification technology is mainly used：Binocular or many mesh computers are constituted using multiple cameras
Vision system.Representative is Xbox Kinect systems, and general principle is exactly this system by each different directions
One group of camera is set up, while gathering image at the same time, three-dimensional coordinate data is produced using complicated composition algorithm, it is this kind of
Way realizes space gesture identification first.Binocular or many mesh computer vision systems are grouped into using multiple cameras, because
Wanting normal work, system for system needs shooting video continuously, and this also increases power consumption；Secondly, such system
System is highly susceptible to the interference of backlight, influences measuring accuracy；Finally, because algorithm complexity is higher in itself, and transfer to CPU completely
Treatment, cannot accomplish that real-time gesture is recognized on common PC.
Thus prior art could be improved and improve.
The content of the invention
In view of above-mentioned the deficiencies in the prior art part, it is an object of the invention to provide a kind of contactless gesture identification
Method and system, without camera and the algorithm of complexity, reduces cost.
In order to achieve the above object, this invention takes following technical scheme：
A kind of contactless gesture recognition system, the system includes：
Signal transmitting and receiving module, for launching wireless signal to detected material and receiving echo-signal, also by the wireless communication
Number and the echo-signal that receives export and give injection phase-locking quadrature receiving module；
Injection phase-locking quadrature receiving module, locks for the phase to the wireless signal, to the echo-signal and lock
Wireless signal after phase carries out quadrature demodulation, the first baseband signal and quadrature branch demodulation that output in-phase branch demodulation is obtained
The second baseband signal for obtaining is to gesture recognition module；
Gesture recognition module, for being judged according to the change of the signal amplitude of first baseband signal and the second baseband signal
The moving direction of the detected material.
In described contactless gesture recognition system, the signal transmitting and receiving module includes：
The wireless communication signals of seizure are exported and give branch line coupling by reception antenna, the wireless communication signals for catching outside
Device；
Transmitting antenna, for launching the wireless communication signals to detected material and receiving the doppler information with detected material
Echo-signal, the echo-signal is exported to branch line coupler；
Branch line coupler, for the wireless communication signals to be exported to transmitting antenna and injection phase-locking quadrature receiving module；
The echo-signal of the doppler information with detected material that transmitting antenna is received is exported gives injection phase-locking quadrature receiving mould
Block.
In described contactless gesture recognition system, the injection phase-locking quadrature receiving module includes：
Injection phase locking oscillator, for locking the frequency and phase of the wireless signal, and exports to orthogonal mixer；
The LNA of two-stage cascade, for that will be amplified to the echo-signal, and exports to power splitter；
Power splitter, the echo for the LNA to be exported amplifies the two paths of signals that signal is divided into the phases such as constant amplitude, and defeated respectively
Go out to orthogonal mixer；
Orthogonal mixer, the wireless signal for being locked to injection phase locking oscillator carries out phase shift, produces mutually orthogonal first
Locking signal and the second locking signal；The signal all the way that first locking signal and power splitter are exported is mixed, by the second lock
Determine signal to be mixed with another road signal that power splitter is exported；It is the frequency of wireless signal and the frequency of echo-signal to obtain frequency
The high-frequency signal of rate sum, frequency are the low frequency signal of the difference of the frequency of the frequency and echo-signal of wireless signal；By the height
Frequency signal and low frequency signal are exported to low-pass filter unit；
Low-pass filter unit, for the high-frequency signal to be filtered, obtains the first baseband signal and the second baseband signal.
In described contactless gesture recognition system, the reception antenna is orthogonal with transmitting antenna.
In described contactless gesture recognition system, the injection phase-locking quadrature receiving module also includes time delay list
Unit, for entering line delay to the echo-signal, makes the echo-signal after time delay and have passed through the wireless of injection phase locking oscillator
Signal is consistent in time, and the echo-signal after time delay is exported to the LNA.
A kind of contactless gesture identification method, methods described comprises the following steps：
A, signal transmitting and receiving module launch wireless signal and receive echo-signal to detected material；
B, injection phase-locking quadrature receiving module are locked to the phase of the wireless signal, after the echo-signal and lock phase
Wireless signal carry out quadrature demodulation, the first baseband signal and quadrature branch demodulation that output in-phase branch demodulation is obtained are obtained
The second baseband signal；
C, gesture recognition module change to judge according to the signal amplitude of first baseband signal and the second baseband signal
State the moving direction of detected material.
In described contactless gesture identification method, the step A specifically includes following steps：
Wireless communication signals outside A1, reception antenna seizure, the wireless communication signals of seizure are exported to branch line coupler；
A2, branch line coupler export the wireless communication signals to transmitting antenna and injection phase-locking quadrature receiving module；
A3, transmitting antenna launch the wireless communication signals and receive the doppler information with detected material to detected material
Echo-signal, the echo-signal is exported to branch line coupler；
The echo-signal is exported and gives injection phase-locking quadrature receiving module by A4, the branch line coupler.
In described contactless gesture identification method, the step B specifically includes following steps：
B1, injection phase locking oscillator lock the frequency and phase of the wireless signal, and export to orthogonal mixer；Two-stage cascade
LNA the echo-signal will be amplified, and export to power splitter；
The echo that B2, power splitter export the LNA amplifies signal and is divided into the two paths of signals of the phases such as constant amplitude, and exports respectively
To orthogonal mixer；
B3, orthogonal mixer carry out phase shift to the wireless signal that injection phase locking oscillator is locked, and produce the first mutually orthogonal lock
Determine signal and the second locking signal；The signal all the way that first locking signal and power splitter are exported is mixed, by the second locking
Signal is mixed with another road signal that power splitter is exported；It is the frequency of wireless signal and the frequency of echo-signal to obtain frequency
The high-frequency signal of sum, frequency are the low frequency signal of the difference of the frequency of the frequency and echo-signal of wireless signal；By the high frequency
Signal and low frequency signal are exported to low-pass filter unit；
B4, low-pass filter unit filter the high-frequency signal, obtain the first baseband signal and the second baseband signal.
In described contactless gesture identification method, the reception antenna is orthogonal with transmitting antenna.
In described contactless gesture identification method, the step B1 also includes：Delay unit is believed the echo
Number enter line delay, the echo-signal after time delay is kept one in time with the wireless signal that have passed through injection phase locking oscillator
Cause, the echo-signal after time delay is exported to the LNA.
Compared to prior art, the present invention provides a kind of contactless gesture identification method and system.Wherein, the system
System includes signal transmitting and receiving module, injection phase-locking quadrature receiving module and gesture recognition module.The present invention is launched by signal
Receiver module launches wireless signal and receives echo-signal to detected material；By injection phase-locking quadrature receiving module to described wireless
The phase of signal is locked, and quadrature demodulation is carried out to the wireless signal after the echo-signal and lock phase, exports in-phase branch
The second baseband signal that the first baseband signal and quadrature branch demodulation that demodulation is obtained are obtained；And then by gesture recognition module root
The moving direction of the detected material is judged according to the signal amplitude change of first baseband signal and the second baseband signal.
Contactless gesture identification is achieved in, the present invention reduces cost, the scope of application without camera and the algorithm of complexity
Extensively.
Brief description of the drawings
The structured flowchart of the contactless gesture recognition system that Fig. 1 is provided for the present invention.
The concrete structure block diagram of the contactless gesture recognition system that Fig. 2 is provided for the present invention.
The schematic diagram of the contactless gesture recognition system that Fig. 3 is provided for the present invention.
In the contactless gesture recognition system that Fig. 4 is provided for the present invention, when palm is moved to transmitting antenna, the first base
The oscillogram of band signal and the second baseband signal.
During Fig. 5 is for the contactless gesture recognition system that provides of the present invention, when palm is moved to transmitting antenna, phase with
The oscillogram of amplitude.
In the contactless gesture recognition system that Fig. 6 is provided for the present invention, when palm is away from transmitting antenna, the first base band
The oscillogram of signal and the second baseband signal.
During Fig. 7 is for the contactless gesture recognition system that provides of the present invention, when palm is away from transmitting antenna, phase and width
The oscillogram of degree.
In the contactless gesture recognition system that Fig. 8 is provided for the present invention, when after palm is close further away from transmitting antenna,
The oscillogram of the first baseband signal and the second baseband signal.
In the contactless gesture recognition system that Fig. 9 is provided for the present invention, when after palm is close further away from transmitting antenna,
The oscillogram of phase and amplitude.
The flow chart of the contactless gesture identification method that Figure 10 is provided for the present invention.
Specific embodiment
The present invention provides a kind of contactless gesture identification method and system.To make the purpose of the present invention, technical scheme
And effect is clearer, clear and definite, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.It should be appreciated that this
The described specific embodiment in place is only used to explain the present invention, is not intended to limit the present invention.
The present invention provides a kind of contactless gesture recognition system, as shown in figure 1, the system includes：Signal is launched
Receiver module 10, injection phase-locking quadrature receiving module 20 and gesture recognition module 30.
The signal transmitting and receiving module 10, for launching wireless signal to detected material and receiving echo-signal, will also
The wireless signal and the echo-signal for receiving are exported to injection phase-locking quadrature receiving module 20.It is described wireless in the present embodiment
Signal is wireless communication signals.
The injection phase-locking quadrature receiving module 20, locks, to described time for the phase to the wireless signal
Wireless signal after ripple signal and lock phase carries out quadrature demodulation, the first baseband signal that output in-phase branch demodulation is obtained and just
The second baseband signal that branch road demodulation is obtained is handed over to gesture recognition module 30.
The gesture recognition module 30, for the signal amplitude according to first baseband signal and the second baseband signal
Change to judge the moving direction of the detected material；Detect that detected material is moved using the phase with gesture modulated signal
Distance, i.e., the phase according to the first baseband signal and the second baseband signal come detect detected material movement distance.
Thus, the present invention passes through signal transmitting and receiving module 10, injection phase-locking quadrature receiving module 20 and gesture identification mould
Block 30, realizes contactless gesture identification, without camera and the algorithm of complexity, reduces cost, applied widely.
Further, Fig. 2 and Fig. 3 is referred to, the signal transmitting and receiving module 10 includes：Reception antenna 110, transmitting day
Line 120, the first bandpass filter 130, the second bandpass filter 140 and branch line coupler 150.The reception antenna 110 leads to
The first input end that the first bandpass filter 130 connects branch line coupler 150 is crossed, the transmitting antenna 120 passes through the second band
Bandpass filter 140 connects the second input of branch line coupler 150；The output end connection note of the branch line coupler 150
Enter to lock phase quadrature receiving module 20.
The reception antenna 110, for catching（Receive）Outside wireless communication signals, the radio communication letter that will be caught
NumberExport to branch line coupler 150；Exported to branch line coupler particular by the first bandpass filter 130
150.That is, described reception antenna 110 is the external wireless communication signals antenna of seizure.Outside wireless communication signals are by external emission
Source（Mod.signal source）There is provided, in the present embodiment, the external emission source is WIFI routers.
The transmitting antenna 120, the wireless communication signals for receiving the forwarding of branch line coupler 150, to detected material
（Such as hand）Launch the wireless communication signalsAnd receive the echo-signal of the doppler information with detected material, the echo-signal is exported to branch line coupler 150.I.e. in the present embodiment, reception antenna 110 can only catch
Catch（Receive）Signal, and transmitting antenna 120 can be launched and can receive signal.In the present embodiment, the wireless communication signals are
WIFI signal, the present invention is forwarded using outside WIFI signal, and obtains doppler echo signal, so as to detect gesture fortune
It is dynamic.Due to the generality of WIFI signal, the scope of application of the invention is extremely wide.The frequency range of WIFI signal is usual in 2.4GHz or so,
So the working frequency range of reception antenna 110 and transmitting antenna 120 is set to 2.3 ~ 2.5GHz.Additionally, the reception antenna and hair
The polarised direction for penetrating the antenna of antenna orthogonal, i.e., two is orthogonal, and to avoid the interference between dual-mode antenna, its precision is compared with traditional passive
Doppler radar is high.The transmitting antenna 120 measures the signal antenna of gesture motion to send.
Because signal used is narrow band signal, so needing bandpass filter to filter the signal of other frequencies, passband
Frequency band is 2.3 ~ 2.5GHz.In other words, first bandpass filter（BPF）130 and second bandpass filter（BPF）
140 are used to be filtered the signal beyond 2.3 ~ 2.5GHz frequency bands；So as to improve the precision of gesture identification.
The branch line coupler（Branch-line coupler）150, it is wireless for receive reception antenna 110
Signal of communication is exported to transmitting antenna 120 and injection phase-locking quadrature receiving module 20；By transmitting antenna 120 receive with quilt
The echo-signal of the doppler information of detectable substanceExport to injection phase-locking quadrature receiving module 20.
Further, the injection phase-locking quadrature receiving module 20 is injection phase-locking Quadrature receiver (ILQR), and it includes：
The LNA of injection phase locking oscillator 210, two-stage cascade（220 and 230）, power splitter（Power divider）240th, orthogonal mixer
250 and low-pass filter unit.First output end of the branch line coupler 150 exports the echo-signal to two-stage cascade
LNA；Second output end of the branch line coupler 150 is by the wireless signal（Wireless communication signals）Export to note
Enter phase-locked oscilaltor 210.First output end of the power splitter 240 connects the first input end of orthogonal mixer 250, the work(
Divide the second input of the second output end connection orthogonal mixer 250 of device 240, the output of the injection phase locking oscillator 210
3rd input of end connection orthogonal mixer 250；The output end of the orthogonal mixer 250 connects the defeated of low-pass filter unit
Enter end；The output end connection gesture recognition module 30 of the low-pass filter unit.
The injection phase locking oscillator（ILO）210, frequency and phase for locking the wireless signal, and will locking
Wireless signal afterwardsExport to orthogonal mixer 250.
The LNA of the two-stage cascade, for that will be amplified to the echo-signal, and exports to power splitter 240.
In other words, the injection phase-locking quadrature receiving module 20 includes the first LNA（LNA）220 and second LNA（LNA）
230.The LNA 230 of first LNA 220 and second is used to be amplified the signal being input into.
The power splitter 240, the echo for the LNA 230 to be exported amplifies the two-way that signal is divided into the phases such as constant amplitude
Signal, and export respectively to orthogonal mixer 250.
The orthogonal mixer 250, for carrying out phase shift to the wireless signal that injection phase locking oscillator 210 is locked, produces
Mutually orthogonal the first locking signal and the second locking signal；The signal all the way that first locking signal and power splitter are exported is carried out
Mixing, another road signal that the second locking signal and power splitter 240 are exported is mixed；Obtain the frequency that frequency is wireless signal
The high-frequency signal of rate and the frequency sum of echo-signal, frequency are low for the difference of the frequency of the frequency and echo-signal of wireless signal
Frequency signal；The high-frequency signal and low frequency signal are exported to low-pass filter unit.Phase shift is to produce the same of local oscillation signal
Mutually with orthogonal two paths of signals, so as to for in-phase branch below（I roads）And quadrature branch（Q roads）It is demodulated.Further,
The orthogonal mixer 250 includes phase shifter 251, the first frequency mixer 252 and the second frequency mixer 253.The phase shifter 251 is used for
To the wireless signalPhase shift is carried out, mutually orthogonal the first locking signal and the second locking signal is produced；By
One locking signal is exported to the first frequency mixer 252, and the second locking signal is exported to the second frequency mixer 253.First mixing
Be mixed for the signal all the way that first locking signal and power splitter 240 are exported by device 252, obtains the frequency that frequency is wireless signal
High-frequency signal, frequency with the frequency sum of echo-signal are the low frequency of the difference of the frequency of the frequency and echo-signal of wireless signal
Signal.Be mixed for another road signal that second locking signal and power splitter 240 are exported by second frequency mixer 253, is obtained
Frequency is high-frequency signal of the frequency with the frequency sum of echo-signal, the frequency and echo that frequency is wireless signal of wireless signal
The low frequency signal of the difference of the frequency of signal.
The low-pass filter unit, for the high-frequency signal to be filtered, the first baseband signal after being demodulated（Base
Band low frequency signal）With the second baseband signal after demodulation（Base band low frequency signal）.It is described in the present embodiment
Low-pass filter unit includes the first low pass filter（LPF）260 and second low pass filter（LPF）270.First low pass filter
（LPF）260 be used for quadrature mixers 250 output signals all the way carry out LPF, obtain in-phase branch demodulation after
First baseband signal.Second low pass filter（LPF）The 270 another road signals for being used for the output of quadrature mixers 250
LPF is carried out, the second baseband signal after quadrature branch demodulation is obtained.The first described baseband signal and
The corresponding demodulation branch road of two baseband signals is respectively in-phase branch（I roads）And quadrature branch（Q roads）, wherein, it is with orthogonal with phase
Relative to wireless signal with mutually or orthogonal.
Further, in order to obtain preferable doppler information, it is necessary to by other interference reductions to can ignore not
Meter.When signal passes through injection phase locking oscillator, signal has one section of time delay, therefore can actively add a part to prolong in radio frequency part
When；Specifically, the injection phase-locking quadrature receiving module 20 also includes delay unit（Not shown in figure）, the delay unit can
To be arranged between the LNA 220 of branch line coupler 150 and first.The delay unit, for entering to the echo-signal
Line delay, makes the echo-signal after time delay be consistent in time with the wireless signal that have passed through injection phase locking oscillator, will
Echo-signal after time delay is exported to the LNA.
The gesture recognition module 30 includes digital storage oscilloscope（DSO）310 and operation processing unit 320.
The digital storage oscilloscope 310 is used to store and show first baseband signal and the second baseband signal.
The operation processing unit 320, it is anti-by calculating for according to first baseband signal and the second baseband signal
Tangent, calculates corresponding phase and amplitude value.Phase calculation formula is as follows：
（Formula 1）；
Wherein,It is doppler information, the doppler information refers to transmission signal due to the shifting of gesture (detected material)
The Doppler frequency shift for moving and producing.
In, MOD is represented asIt is rightCarry out modulus；,With
AndDirect current and zoop are may be considered,It is the phase with doppler information.
The formula of calculating amplitude is as follows：
（Formula 2）.
The present invention provide gesture recognition system primarily to measure gesture movement direction and distance, so hand survey
In being kept in motion during amount.When an electromagnetic wave signal reflects by mobile object, it will produce Doppler frequently
Move, and frequency change is mainly reflected in phase place change, therefore the system mainly with phase judge the movement of gesture.Profit
Phase information now can be obtained with first baseband signal and the second baseband signal.By the changing value of phase, can be with
Calculate the displacement of gesture.When the motion of hand be to transmitting antenna 120 near or away from when, I roads signal
Or Q roads signalCorresponding waveform has advanced or delayed, it is possible to use this information put the differentiation in direction；
Or, when signal is near antenna or away from antenna, corresponding emitted energy can also be changed, and be become by seeking corresponding amplitude
Change can also judge the moving direction sold.In other words, operation processing unit 320 is additionally operable in the second baseband signalIt is ahead of the first baseband signalWhen, it is believed that object to be detected is close to transmitting antenna 120；In the second base band
SignalLag behind the first baseband signalWhen, it is believed that object to be detected is away from transmitting antenna 120；Due to phase
With apart from linear change, so according to the phase change value for calculating and default convert formula, phase change value is converted
Into the displacement of object to be detected, thus detection obtains the moving direction and distance of gesture.
When Fig. 4 is that palm is moved to transmitting antenna, the second baseband signal（Q Signal）With the first baseband signal（I
Signal）Oscillogram；When Fig. 5 is that palm is moved to transmitting antenna, phase（IQ Phase）And amplitude（IQ Magnitude）
Oscillogram.In Fig. 4 and Fig. 5, curve a represents I roads signal（First baseband signal）, curve b represents Q roads signal（Second base band
Signal）.For convenience of explanation, each waveform has an arrow to indicate explanation, and the arrow on a curves points to the coordinate on the left side
Information, the coordinate information on the right of arrow representative on b curves.From image viewing, when hand is near antenna, I roads signal neck
First Q roads signal, therefore the moving direction of gesture can be determined by I roads and the leading situation of Q roads signal waveform.And, by
In phase and apart from linear change, so corresponding phase place change can be converted to distance, and the distance that this is calculated and
Actual mobile distance is more or less the same.
Fig. 6 be palm away from transmitting antenna when, the second baseband signal（Q Signal）With the first baseband signal（I
Signal）Oscillogram；Fig. 7 be palm away from transmitting antenna when, phase（IQ Phase）And amplitude（IQ Magnitude）'s
Oscillogram.In Fig. 6 and Fig. 7, curve a represents I roads signal（First baseband signal）, curve b represents Q roads signal（Second base band is believed
Number）.Overall method of discrimination is as above analyzed unanimously, so, from image viewing, when palm is away from transmitting antenna, Q roads letter
Number leading I roads signal, corresponding phase place change is converted to distance, and actual mobile distance is more or less the same.
When Fig. 8 is palm after further away from transmitting antenna, the second baseband signal（Q Signal）With the first baseband signal
（I Signal）Oscillogram；When Fig. 9 is palm after further away from transmitting antenna, phase（IQ Phase）And amplitude（IQ
Magnitude）Oscillogram.In Fig. 8 and Fig. 9, curve a represents I roads signal（First baseband signal）, curve b represents Q roads signal
（Second baseband signal）.From image viewing, when palm is close to, the leading Q roads signal of I roads signal, corresponding phase place change
Distance is converted to, and actual mobile distance is more or less the same.When palm away from when, the leading I roads signal of Q roads signal, corresponding phase
Position change is converted to distance, and actual mobile distance is more or less the same.
In sum, the gesture recognition system that the present invention is provided, gesture movement is detected using microwave radar technology, that is, adopt
It is contactless Gesture Recognition；Traditional passive radar produces signal source due to itself, internal interference than larger,
Therefore, wireless communication signals of the present invention outside；Finally, it is different from other reference external signal detecting systems, the design
Injection phase-locking Quadrature receiver is introduced, so as to avoid the analysis to external signal, without introducing too many complicated algorithm.
Based on the contactless gesture recognition system that above-described embodiment is provided, the present invention also provides a kind of contactless
Gesture identification method, refers to Figure 10, and methods described comprises the following steps：
S10, signal transmitting and receiving module launch wireless signal and receive echo-signal to detected material；
S20, injection phase-locking quadrature receiving module are locked to the phase of the wireless signal, to the echo-signal and lock phase
Wireless signal afterwards carries out quadrature demodulation, and the first baseband signal and quadrature branch that output in-phase branch demodulation is obtained are demodulated
The second baseband signal for arriving；
S30, gesture recognition module change to judge according to the signal amplitude of first baseband signal and the second baseband signal
The moving direction of the detected material.
Specifically, the step S10 specifically includes following steps：
Wireless communication signals outside S110, reception antenna seizure, the wireless communication signals of seizure are exported and give branch line coupling
Device；
S120, branch line coupler export the wireless communication signals to transmitting antenna and injection phase-locking quadrature receiving module；
S130, transmitting antenna launch the wireless communication signals and receive the doppler information with detected material to detected material
Echo-signal, the echo-signal is exported to branch line coupler；The reception antenna is orthogonal with transmitting antenna；
The echo-signal is exported and gives injection phase-locking quadrature receiving module by S140, the branch line coupler.
Further, the step S20 specifically includes following steps：
S210, injection phase locking oscillator lock the frequency and phase of the wireless signal, and export to orthogonal mixer；Two-stage level
The LNA of connection will be amplified to the echo-signal, and export to power splitter；
The echo that S220, power splitter export the LNA amplifies the two paths of signals that signal is divided into the phases such as constant amplitude, and defeated respectively
Go out to orthogonal mixer；
S230, orthogonal mixer carry out phase shift to the wireless signal that injection phase locking oscillator is locked, and produce mutually orthogonal first
Locking signal and the second locking signal；The signal all the way that first locking signal and power splitter are exported is mixed, by the second lock
Determine signal to be mixed with another road signal that power splitter is exported；It is the frequency of wireless signal and the frequency of echo-signal to obtain frequency
The high-frequency signal of rate sum, frequency are the low frequency signal of the difference of the frequency of the frequency and echo-signal of wireless signal；By the height
Frequency signal and low frequency signal are exported to low-pass filter unit；
S240, low-pass filter unit filter the high-frequency signal, obtain the first baseband signal and the second baseband signal.
In described contactless gesture identification method, the step S210 also includes：Delay unit is to the echo
Signal enters line delay, the echo-signal after time delay is kept one in time with the wireless signal that have passed through injection phase locking oscillator
Cause, the echo-signal after time delay is exported to the LNA.
Because the principle of the contactless gesture identification method, feature are explained in detail in said system embodiment
State, will not be repeated here.
It is understood that for those of ordinary skills, can be with technology according to the present invention scheme and its hair
Bright design is subject to equivalent or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Shield scope.
Claims (10)
1. a kind of contactless gesture recognition system, it is characterised in that the system includes：
Signal transmitting and receiving module, for launching wireless signal to detected material and receiving echo-signal, also by the wireless communication
Number and the echo-signal that receives export and give injection phase-locking quadrature receiving module；
Injection phase-locking quadrature receiving module, locks for the phase to the wireless signal, to the echo-signal and lock
Wireless signal after phase carries out quadrature demodulation, the first baseband signal and quadrature branch demodulation that output in-phase branch demodulation is obtained
The second baseband signal for obtaining is to gesture recognition module；
Gesture recognition module, for being judged according to the change of the signal amplitude of first baseband signal and the second baseband signal
The moving direction of the detected material.
2. contactless gesture recognition system according to claim 1, it is characterised in that the signal transmitting receives mould
Block includes：
The wireless communication signals of seizure are exported and give branch line coupling by reception antenna, the wireless communication signals for catching outside
Device；
Transmitting antenna, for launching the wireless communication signals to detected material and receiving the doppler information with detected material
Echo-signal, the echo-signal is exported to branch line coupler；
Branch line coupler, for the wireless communication signals to be exported to transmitting antenna and injection phase-locking quadrature receiving module；
The echo-signal of the doppler information with detected material that transmitting antenna is received is exported gives injection phase-locking quadrature receiving mould
Block.
3. contactless gesture recognition system according to claim 1, it is characterised in that the injection phase-locking just joins
Receiving module includes：
Injection phase locking oscillator, for locking the frequency and phase of the wireless signal, and exports to orthogonal mixer；
The LNA of two-stage cascade, for that will be amplified to the echo-signal, and exports to power splitter；
Power splitter, the echo for the LNA to be exported amplifies the two paths of signals that signal is divided into the phases such as constant amplitude, and defeated respectively
Go out to orthogonal mixer；
Orthogonal mixer, the wireless signal for being locked to injection phase locking oscillator carries out phase shift, produces mutually orthogonal first
Locking signal and the second locking signal；The signal all the way that first locking signal and power splitter are exported is mixed, by the second lock
Determine signal to be mixed with another road signal that power splitter is exported；It is the frequency of wireless signal and the frequency of echo-signal to obtain frequency
The high-frequency signal of rate sum, frequency are the low frequency signal of the difference of the frequency of the frequency and echo-signal of wireless signal；By the height
Frequency signal and low frequency signal are exported to low-pass filter unit；
Low-pass filter unit, for the high-frequency signal to be filtered, obtains the first baseband signal and the second baseband signal.
4. contactless gesture recognition system according to claim 2, it is characterised in that the reception antenna and transmitting
Antenna orthogonal.
5. contactless gesture recognition system according to claim 3, it is characterised in that the injection phase-locking just joins
Receiving module also includes delay unit, for entering line delay to the echo-signal, makes the echo-signal after time delay and have passed through note
The wireless signal for entering phase-locked oscilaltor is consistent in time, and the echo-signal after time delay is exported to the LNA.
6. a kind of contactless gesture identification method, it is characterised in that methods described comprises the following steps：
A, signal transmitting and receiving module launch wireless signal and receive echo-signal to detected material；
B, injection phase-locking quadrature receiving module are locked to the phase of the wireless signal, after the echo-signal and lock phase
Wireless signal carry out quadrature demodulation, the first baseband signal and quadrature branch demodulation that output in-phase branch demodulation is obtained are obtained
The second baseband signal；
C, gesture recognition module change to judge according to the signal amplitude of first baseband signal and the second baseband signal
State the moving direction of detected material.
7. contactless gesture identification method according to claim 6, it is characterised in that the step A is specifically included
Following steps：
Wireless communication signals outside A1, reception antenna seizure, the wireless communication signals of seizure are exported to branch line coupler；
A2, branch line coupler export the wireless communication signals to transmitting antenna and injection phase-locking quadrature receiving module；
A3, transmitting antenna launch the wireless communication signals and receive the doppler information with detected material to detected material
Echo-signal, the echo-signal is exported to branch line coupler；
The echo-signal is exported and gives injection phase-locking quadrature receiving module by A4, the branch line coupler.
8. contactless gesture identification method according to claim 6, it is characterised in that the step B is specifically included
Following steps：
B1, injection phase locking oscillator lock the frequency and phase of the wireless signal, and export to orthogonal mixer；Two-stage cascade
LNA the echo-signal will be amplified, and export to power splitter；
The echo that B2, power splitter export the LNA amplifies signal and is divided into the two paths of signals of the phases such as constant amplitude, and exports respectively
To orthogonal mixer；
B3, orthogonal mixer carry out phase shift to the wireless signal that injection phase locking oscillator is locked, and produce the first mutually orthogonal lock
Determine signal and the second locking signal；The signal all the way that first locking signal and power splitter are exported is mixed, by the second locking
Signal is mixed with another road signal that power splitter is exported；It is the frequency of wireless signal and the frequency of echo-signal to obtain frequency
The high-frequency signal of sum, frequency are the low frequency signal of the difference of the frequency of the frequency and echo-signal of wireless signal；By the high frequency
Signal and low frequency signal are exported to low-pass filter unit；
B4, low-pass filter unit filter the high-frequency signal, obtain the first baseband signal and the second baseband signal.
9. contactless gesture identification method according to claim 7, it is characterised in that the reception antenna and transmitting
Antenna orthogonal.
10. contactless gesture identification method according to claim 8, it is characterised in that the step B1 also includes：
Delay unit enters line delay to the echo-signal, makes the echo-signal after time delay and have passed through the wireless of injection phase locking oscillator
Signal is consistent in time, and the echo-signal after time delay is exported to the LNA.
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| TWI690720B (en) * | 2019-01-30 | 2020-04-11 | 昇雷科技股份有限公司 | Noncontact vibration sensor |
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