CN106774825B - A kind of contactless gesture identification method and system - Google Patents

A kind of contactless gesture identification method and system Download PDF

Info

Publication number
CN106774825B
CN106774825B CN201611003899.8A CN201611003899A CN106774825B CN 106774825 B CN106774825 B CN 106774825B CN 201611003899 A CN201611003899 A CN 201611003899A CN 106774825 B CN106774825 B CN 106774825B
Authority
CN
China
Prior art keywords
signal
echo
locking
frequency
phase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201611003899.8A
Other languages
Chinese (zh)
Other versions
CN106774825A (en
Inventor
金海焱
廖丹
陆川
杨乐辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Konka Group Co Ltd
Original Assignee
Konka Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Konka Group Co Ltd filed Critical Konka Group Co Ltd
Priority to CN201611003899.8A priority Critical patent/CN106774825B/en
Publication of CN106774825A publication Critical patent/CN106774825A/en
Application granted granted Critical
Publication of CN106774825B publication Critical patent/CN106774825B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/017Gesture based interaction, e.g. based on a set of recognized hand gestures

Abstract

The invention discloses a kind of contactless gesture identification methods and system.Wherein, the system comprises signal transmitting and receiving module, injection phase-locking quadrature receiving module and gesture recognition modules.The present invention emits wireless signal and receives echo-signal to detected material by signal transmitting and receiving module;It is locked by phase of the injection phase-locking quadrature receiving module to the wireless signal, quadrature demodulation is carried out to the wireless signal after the echo-signal and locking phase, the second baseband signal that the first baseband signal and quadrature branch that output in-phase branch demodulates demodulate;And then the moving direction of the detected material is judged according to the variation of the signal amplitude of first baseband signal and the second baseband signal by gesture recognition module.It is achieved in contactless gesture identification, the present invention is reduced costs without camera and complicated algorithm, applied widely.

Description

A kind of contactless gesture identification method and system
Technical field
The present invention relates to gesture identification method field, in particular to a kind of contactless gesture identification method and system.
Background technique
Compared to the gesture identification method of contact, it is more freely empty that contactless recognition methods can allow people that can 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 have more advantages than pervious method.It uses microwave Technology has preferable penetrability;It does not need additionally actively to generate signal source, there is lower power consumption;Using indoor wireless Signal of communication, can be to avoid many internal interferences;Addition retransmission mechanism and coupled apparatus come the echo-signal that is separately received and The wireless communication signals received;Injection locking phase Quadrature receiver (ILQR) is introduced to guarantee higher sensitivity, is avoided more numerous Trivial encoding and decoding and etc..Therefore, there is biggish application space in future, specific as follows:
(1) in field of mobile equipment: following world is the world of Internet of Things, and the market of mobile terminal is very big, spy It is not the market of smart phone.If the wireless controlling equipment of gesture can be utilized at a distance, this can allow people to have better experience Sense, and people's operation can be made more convenient.
(2) field of play: being not only to lean on mouse screen as people require higher and higher, following game to game experiencing Curtain is just able to satisfy human needs, is more human-computer interaction.Therefore, if using this technology, Ke Yiyuan on a hardware platform The gesture motion of the detection identification people of distance, people can freely carry out human-computer interaction, have better game experiencing sense.
(3) smart home: more intelligent control system, if can free control system at a distance running, meeting Incomparable comfort is brought to the life of people usually.If can use gesture at a distance controls smart machine, just do not have to yet Too many movement can control equipment as long as making a motion gesture, this can bring great convenience to the normal life of people.
Existing non-contact gesture identification technology mainly uses: using multiple cameras composition binocular or more mesh computers Vision system.Representative is Xbox Kinect system, and basic principle is exactly that this system passes through in each different directions One group of camera is set up, while acquiring image at the same time, three-dimensional coordinate data is generated using complicated composition algorithm, it is such Way realizes space gesture identification for the first time.Composition binocular or more mesh computer vision systems are formed using multiple cameras, because It to be worked normally for system, system needs shooting video continuously, this also increases power consumption;Secondly, such system System is highly susceptible to the interference of backlight, influences measuring accuracy;Finally, because algorithm complexity itself is higher, and CPU is transferred to completely Processing can not accomplish that real-time gesture identifies on common PC.
Thus the prior art could be improved and improve.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of contactless gesture identifications Method and system is reduced costs without camera and complicated algorithm.
In order to achieve the above object, this invention takes following technical schemes:
A kind of contactless gesture recognition system, the system comprises:
Signal transmitting and receiving module, for emitting wireless signal and receives echo-signal to detected material, also by the nothing Line signal and received echo-signal, which export, gives injection phase-locking quadrature receiving module;
Injection phase-locking quadrature receiving module, locks for the phase to the wireless signal, to the echo-signal Quadrature demodulation, the first baseband signal and quadrature branch that output in-phase branch demodulates are carried out with the wireless signal after locking phase The second obtained baseband signal is demodulated to gesture recognition module;
Gesture recognition module, for according to the signal amplitude of first baseband signal and the second baseband signal change come Judge the moving direction of the detected material.
In the contactless gesture recognition system, the signal transmitting and receiving module includes:
Receiving antenna exports the wireless communication signals of capture to branch line for capturing external wireless communication signals Coupler;
Transmitting antenna, for emitting the wireless communication signals to detected material and receiving the Doppler with detected material The echo-signal of information exports the echo-signal to branch line coupler;
Branch line coupler, for exporting the wireless communication signals to transmitting antenna and injection phase-locking quadrature receiving mould Block;The echo-signal for the doppler information with detected material that transmitting antenna receives is exported and gives injection phase-locking quadrature receiving Module.
In the 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 is exported to orthogonal mixer;
The low noise of two-stage cascade for that will amplify to the echo-signal, and is exported to power splitter;
Power splitter, the echo amplified signal for exporting the low noise is divided into the two paths of signals of the phases such as constant amplitude, and divides It Shu Chu not be to orthogonal mixer;
Orthogonal mixer, the wireless signal for locking to injection phase locking oscillator carry out phase shift, generate mutually orthogonal First locking signal and the second locking signal;First locking signal is mixed with the signal all the way that power splitter exports, by Two locking signals are mixed with the another way signal that power splitter exports;Obtain the frequency and echo-signal that frequency is wireless signal The high-frequency signal of the sum of frequency, the frequency that frequency is wireless signal and echo-signal frequency difference low frequency signal;By institute It states high-frequency signal and low frequency signal is exported to low-pass filter unit;
Low-pass filter unit obtains the first baseband signal and the second baseband signal for filtering out the high-frequency signal.
In the contactless gesture recognition system, the receiving antenna is orthogonal with transmitting antenna.
In the contactless gesture recognition system, the injection phase-locking quadrature receiving module further includes that delay is single Member, for being delayed to the echo-signal, making the echo-signal after being delayed and have passed through the wireless of injection phase locking oscillator Signal is consistent in time, and the echo-signal after delay is exported to the low noise.
A kind of contactless gesture identification method, described method includes following steps:
A, signal transmitting and receiving module emits wireless signal and receives echo-signal to detected material;
B, injection phase-locking quadrature receiving module locks the phase of 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 demodulates The second obtained baseband signal;
C, gesture recognition module changes according to the signal amplitude of first baseband signal and the second baseband signal to sentence Break the moving direction of the detected material.
In the contactless gesture identification method, the step A specifically comprises the following steps:
Wireless communication signals outside A1, receiving antenna capture, the wireless communication signals of capture are exported and give branch line coupling Clutch;
A2, branch line coupler export the wireless communication signals to transmitting antenna and injection phase-locking quadrature receiving mould Block;
A3, transmitting antenna, which emit the wireless communication signals to detected material and receive the Doppler with detected material, to be believed The echo-signal of breath exports the echo-signal to branch line coupler;
A4, the branch line coupler, which export the echo-signal, gives injection phase-locking quadrature receiving module.
In the contactless gesture identification method, the step B specifically comprises the following steps:
B1, injection phase locking oscillator lock the frequency and phase of the wireless signal, and export to orthogonal mixer;Two-stage Cascade low noise will amplify the echo-signal, and export to power splitter;
The echo amplified signal that the low noise exports is divided into the two paths of signals of the phases such as constant amplitude by B2, power splitter, and respectively It exports to orthogonal mixer;
The wireless signal that B3, orthogonal mixer lock injection phase locking oscillator carries out phase shift, generates mutually orthogonal the One locking signal and the second locking signal;First locking signal is mixed with the signal all the way that power splitter exports, by second Locking signal is mixed with the another way signal that power splitter exports;Obtain the frequency and echo-signal that frequency is wireless signal The low frequency signal of the difference of the frequency of the high-frequency signal of the sum of frequency, the frequency that frequency is wireless signal and echo-signal;It will be described High-frequency signal and low frequency signal are exported to low-pass filter unit;
B4, low-pass filter unit filter out the high-frequency signal, obtain the first baseband signal and the second baseband signal.
In the contactless gesture identification method, the receiving antenna is orthogonal with transmitting antenna.
In the contactless gesture identification method, the step B1 further include: delay unit believes the echo It number is delayed, the echo-signal after making delay keeps one with the wireless signal that have passed through injection phase locking oscillator in time It causes, the echo-signal after delay is exported to the low noise.
Compared to the 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 emitted by signal Receiving module emits 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 is carried out quadrature demodulation to the wireless signal after the echo-signal and locking phase, is exported in-phase branch Demodulate the second baseband signal that the first obtained baseband signal and quadrature branch demodulate;And then by gesture recognition module root Change the moving direction to judge the detected material according to the signal amplitude of first baseband signal and the second baseband signal. It is achieved in contactless gesture identification, the present invention reduces costs, the scope of application without camera and complicated algorithm Extensively.
Detailed description of the invention
Fig. 1 is the structural block diagram of contactless gesture recognition system provided by the invention.
Fig. 2 is the specific block diagram of contactless gesture recognition system provided by the invention.
Fig. 3 is the schematic diagram of contactless gesture recognition system provided by the invention.
Fig. 4 is in contactless gesture recognition system provided by the invention, when palm is mobile to transmitting antenna, the first base The waveform diagram of band signal and the second baseband signal.
Fig. 5 is in contactless gesture recognition system provided by the invention, when palm is mobile to transmitting antenna, phase and The waveform diagram of amplitude.
Fig. 6 be contactless gesture recognition system provided by the invention in, when palm is far from transmitting antenna, the first base band The waveform diagram of signal and the second baseband signal.
Fig. 7 be contactless gesture recognition system provided by the invention in, when palm is far from transmitting antenna, phase and width The waveform diagram of degree.
Fig. 8 be contactless gesture recognition system provided by the invention in, palm close to after further away from transmitting antenna when, The waveform diagram of first baseband signal and the second baseband signal.
Fig. 9 be contactless gesture recognition system provided by the invention in, palm close to after further away from transmitting antenna when, The waveform diagram of phase and amplitude.
Figure 10 is the flow chart of contactless gesture identification method provided by the 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 solution And effect is clearer, clear, the present invention is described in more detail as follows in conjunction with drawings and embodiments.It should be appreciated that this Place is described, and specific examples are 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 comprises: signal transmitting Receiving module 10, injection phase-locking quadrature receiving module 20 and gesture recognition module 30.
The signal transmitting and receiving module 10, for will also to detected material transmitting wireless signal and receives echo-signal The wireless signal and received echo-signal 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 for the phase to the wireless signal, to described time Wireless signal after wave signal and locking phase carries out quadrature demodulation, the first baseband signal that output in-phase branch demodulates and just The second baseband signal for handing over branch to demodulate is 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 the moving direction to judge the detected material;It is mobile that detected material is detected using the phase with gesture modulated signal Distance, i.e., the mobile distance of detected material is detected according to the phase of the first baseband signal and the second baseband signal.
The present invention passes through signal transmitting and receiving module 10, injection phase-locking quadrature receiving module 20 and gesture identification mould as a result, Block 30 realizes contactless gesture identification, without camera and complicated algorithm, reduces costs, applied widely.
Further, Fig. 2 and Fig. 3 are please referred to, the signal transmitting and receiving module 10 includes: receiving antenna 110, transmitting day Line 120, the first bandpass filter 130, the second bandpass filter 140 and branch line coupler 150.The receiving antenna 110 is logical The first input end of the first bandpass filter 130 connection branch line coupler 150 is crossed, the transmitting antenna 120 passes through the second band Second input terminal of the connection branch line coupler 150 of bandpass filter 140;The output end of the branch line coupler 150 connects note Enter locking phase quadrature receiving module 20.
The receiving antenna 110 believes the wireless communication of capture for capturing and (receiving) external wireless communication signals NumberIt exports to branch line coupler 150;It exports particular by the first bandpass filter 130 to branch line coupler 150.That is, the receiving antenna 110 is to capture external wireless communication signals antenna.External wireless communication signals are by external emission Source (Mod.signal source) provides, and in the present embodiment, the external emission source is WIFI router.
The transmitting antenna 120, for receiving the wireless communication signals of the forwarding of branch line coupler 150, to detected material (such as hand) emits 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, receiving antenna 110 can only be caught (reception) signal is caught, and transmitting antenna 120 can emit can receive signal.In the present embodiment, the wireless communication signals are WIFI signal, the present invention is forwarded using external WIFI signal, and obtains doppler echo signal, 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 usually in 2.4GHz or so, So the working frequency range of receiving antenna 110 and transmitting antenna 120 is set as 2.3 ~ 2.5GHz.In addition, the receiving antenna and hair Antenna orthogonal is penetrated, i.e., the polarization direction of two antennas is orthogonal, and to avoid the interference between dual-mode antenna, precision is compared with traditional passive Doppler radar is high.The transmitting antenna 120 is the signal antenna for sending measurement gesture motion.
Since signal used is narrow band signal, so needing bandpass filter to filter out the signal of other frequencies, passband Frequency band is 2.3 ~ 2.5GHz.In other words, first bandpass filter (BPF) 130 and the second bandpass filter (BPF) 140 are used to be filtered the signal other than 2.3 ~ 2.5GHz frequency band;To improve the precision of gesture identification.
The branch line coupler (Branch-line coupler) 150, for receiving antenna 110 is received wireless Signal of communication is exported to transmitting antenna 120 and injection phase-locking quadrature receiving module 20;Quilt is had by what transmitting antenna 120 received The echo-signal of the doppler information of detectable substanceIt exports to injection phase-locking quadrature receiving module 20.
Further, the injection phase-locking quadrature receiving module 20 is injection phase-locking Quadrature receiver (ILQR) comprising: Injection phase locking oscillator 210, the low noise (220 and 230) of two-stage cascade, power splitter (power divider) 240, 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 Low noise;The second output terminal of the branch line coupler 150 exports the wireless signal (wireless communication signals) to note Enter phase-locked oscilaltor 210.The first input end of the first output end connection orthogonal mixer 250 of the power splitter 240, the function Divide the second input terminal of the second output terminal connection orthogonal mixer 250 of device 240, the output of the injection phase locking oscillator 210 The third input terminal 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 of the low-pass filter unit connects gesture recognition module 30.
The injection phase locking oscillator (ILO) 210, for locking the frequency and phase of the wireless signal, and will locking Wireless signal afterwardsIt exports to orthogonal mixer 250.
The low noise of the two-stage cascade for that will amplify to the echo-signal, and is exported to power splitter 240. In other words, the injection phase-locking quadrature receiving module 20 includes the first low noise (LNA) 220 and the second low noise (LNA) 230.First low noise 220 and the second low noise 230 are used to amplify the signal of input.
The power splitter 240, the echo amplified signal for exporting the low noise 230 are divided into the two-way of the phases such as constant amplitude Signal, and exported respectively to orthogonal mixer 250.
The orthogonal mixer 250, the wireless signal for locking to injection phase locking oscillator 210 carry out phase shift, generate Mutually orthogonal the first locking signal and the second locking signal;The signal all the way of first locking signal and power splitter output is carried out Mixing, the second locking signal is mixed with the another way signal that power splitter 240 exports;Obtain the frequency that frequency is wireless signal The high-frequency signal of the sum of the frequency of rate and echo-signal, frequency are low for the difference of the frequency of wireless signal and the frequency of echo-signal Frequency signal;The high-frequency signal and low frequency signal are exported to low-pass filter unit.Phase shift is to generate the same of local oscillation signal Phase and orthogonal two paths of signals, to be demodulated for subsequent in-phase branch (road I) and quadrature branch (road Q).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 are generated;By first Locking signal is exported to the first frequency mixer 252, and the second locking signal is exported to the second frequency mixer 253.First frequency mixer 252 are mixed the first locking signal with the signal all the way that power splitter 240 exports, obtain frequency be wireless signal frequency with The low frequency of the difference of the frequency of the high-frequency signal of the sum of the frequency of echo-signal, the frequency that frequency is wireless signal and echo-signal is believed Number.Second locking signal is mixed by second frequency mixer 253 with the another way signal that power splitter 240 exports, and obtains frequency Rate is that the high-frequency signal of the sum of the frequency of wireless signal and the frequency of echo-signal, the frequency that frequency is wireless signal and echo are believed Number frequency difference low frequency signal.
The low-pass filter unit, the first baseband signal (base for filtering out the high-frequency signal, after being demodulated Band low frequency signal)With the second baseband signal (base band low frequency signal) after demodulation.It is described low in the present embodiment Pass filtering unit includes the first low-pass filter (LPF) 260 and the second low-pass filter (LPF) 270.First low-pass filter (LPF) 260 for quadrature mixers 250 export signals all the way carry out low-pass filtering, obtain in-phase branch demodulation after First baseband signal.Second low-pass filter (LPF) 270 for quadrature mixers 250 export another way signal into Row low-pass filtering obtains the second baseband signal after quadrature branch demodulation.First baseband signal and the second base The corresponding demodulation branch of band signal is respectively in-phase branch (road I) and quadrature branch (road Q), wherein with mutually and it is orthogonal be opposite In wireless signal with mutually or orthogonal.
Further, in order to obtain preferable doppler information, need other interference reductions to can ignore not Meter.When signal passes through injection phase locking oscillator, signal has one section of delay, therefore actively a part can be added to prolong in radio frequency part When;Specifically, the injection phase-locking quadrature receiving module 20 further includes delay unit (not shown), the delay unit can To be arranged between branch line coupler 150 and the first low noise 220.The delay unit, for the echo-signal into Line delay, the echo-signal after making delay are consistent in time with the wireless signal that have passed through injection phase locking oscillator, will Echo-signal after delay is exported to the low noise.
The gesture recognition module 30 includes digital storage oscilloscope (DSO) 310 and operation processing unit 320.
The digital storage oscilloscope 310 is for storing and showing first baseband signal and the second baseband signal.
The operation processing unit 320 is used for according to first baseband signal and the second baseband signal, anti-by calculating Tangent calculates corresponding phase and amplitude value.Phase calculation formula is as follows:
(formula 1);
Wherein,For doppler information, the doppler information refers to transmitting signal due to gesture (detected material) Mobile and generation Doppler frequency shift.In, MOD is represented asIt is rightCarry out modulus;,AndIt can To be considered direct current and zoop,It is the phase with doppler information.
The formula of calculating amplitude is as follows:
(formula 2).
Gesture recognition system provided by the invention is primarily to measure the mobile direction of gesture and distance, so hand is being surveyed In being kept in motion during amount.When an electromagnetic wave signal is reflected by mobile object, it will generate Doppler's frequency It moves, and frequency variation is mainly reflected in phase change, therefore this system mainly judge with phase the movement of gesture.Benefit Phase information at this time can be found out with first baseband signal and the second baseband signal.It, can be with by the changing value of phase The moving distance of gesture is calculated.When the movement of hand is close or separate to transmitting antenna 120, the road I signalOr The road person Q signalCorresponding waveform has advanced or lag, can use the differentiation that this information put direction;Alternatively, When signal is close to antenna or far from antenna, corresponding emitted energy can also be changed, by asking corresponding amplitude to change It may determine that the moving direction sold.In other words, operation processing unit 320 is also used in the second baseband signalIn advance In the first baseband signalWhen, it is believed that object to be detected is close to transmitting antenna 120;In the second baseband signalIt is stagnant Afterwards in the first baseband signalWhen, it is believed that object to be detected is far from transmitting antenna 120;Due to phase and apart from linear change Change, so phase change value is converted to object to be detected according to calculated phase change value and preset convert formula Moving distance, thus detection obtains the moving direction and distance of gesture.
When Fig. 4 is that palm is mobile to transmitting antenna, the second baseband signal (Q Signal) and the first baseband signal (I Signal waveform diagram);When Fig. 5 is that palm is mobile to transmitting antenna, phase (IQ Phase) and amplitude (IQ Magnitude) Waveform diagram.In Fig. 4 and Fig. 5, curve a is represented the road I signal (the first baseband signal), and curve b represents the road Q signal (the second base band Signal).For convenience of explanation, each waveform has an arrow instruction explanation, and the arrow on a curve is directed toward the coordinate on the left side Information, the arrow on b curve represent the coordinate information on the right.By image viewing as it can be seen that when hand is close to antenna, the road I signal neck The first road Q signal, therefore the moving direction of gesture can be determined by the leading situation on the road I and the road Q signal waveform.Moreover, by In phase and apart from linear variation, so corresponding phase change can be converted to distance, and the distance that this is calculated and The distance actually moved is not much different.
Fig. 6 be palm far from transmitting antenna when, the second baseband signal (Q Signal) and the first baseband signal (I Signal waveform diagram);Fig. 7 be palm far from transmitting antenna when, phase (IQ Phase) and amplitude (IQ Magnitude) Waveform diagram.In Fig. 6 and Fig. 7, curve a is represented the road I signal (the first baseband signal), and curve b represents the road Q signal (the second base band letter Number).Whole method of discrimination is as above analyzed unanimously, so, by image viewing as it can be seen that when palm is far from transmitting antenna, the road Q letter Number leading road I signal, corresponding phase change is converted to distance, and the distance actually moved is not much different.
When Fig. 8 is palm after further away from transmitting antenna, the second baseband signal (Q Signal) and the first baseband signal The waveform diagram of (I Signal);When Fig. 9 is palm after further away from transmitting antenna, phase (IQ Phase) and amplitude (IQ Magnitude waveform diagram).In Fig. 8 and Fig. 9, curve a represents the road I signal (the first baseband signal), and curve b represents the road Q signal (the second baseband signal).By image viewing as it can be seen that when palm close to when, the leading road the Q signal of the road I signal, corresponding phase change It is converted to distance, and the distance actually moved is not much different.When palm far from when, the leading road the I signal of the road Q signal, corresponding phase Position variation is converted to distance, and the distance actually moved is not much different.
In conclusion gesture recognition system provided by the invention, gesture movement is detected using microwave radar technology, that is, is adopted It is contactless Gesture Recognition;For traditional passive radar since itself generates signal source, internal interference is bigger, Therefore, wireless communication signals of the present invention outside;Finally, the design different from other reference external signal detection systems Injection phase-locking Quadrature receiver is introduced, so as to avoid the analysis to external signal, without introducing too many complicated algorithm.
The contactless gesture recognition system provided based on the above embodiment, the present invention also provides a kind of contactless Gesture identification method, referring to Fig. 10, described method includes following steps:
S10, signal transmitting and receiving module emit wireless signal and receives echo-signal to detected material;
S20, injection phase-locking quadrature receiving module lock the phase of the wireless signal, to the echo-signal and Wireless signal after locking phase carries out quadrature demodulation, the first baseband signal and quadrature branch solution that output in-phase branch demodulates Adjust the second obtained baseband signal;
S30, gesture recognition module according to the signal amplitude of first baseband signal and the second baseband signal change come Judge the moving direction of the detected material.
Specifically, the step S10 specifically comprises the following steps:
Wireless communication signals outside S110, receiving antenna capture, the wireless communication signals of capture are exported to branch line Coupler;
S120, branch line coupler export the wireless communication signals to transmitting antenna and injection phase-locking quadrature receiving mould Block;
S130, transmitting antenna emit the wireless communication signals to detected material and receive the Doppler with detected material The echo-signal of information exports the echo-signal to branch line coupler;The receiving antenna is orthogonal with transmitting antenna;
S140, the branch line coupler, which export the echo-signal, gives injection phase-locking quadrature receiving module.
Further, the step S20 specifically comprises the following steps:
S210, injection phase locking oscillator lock the frequency and phase of the wireless signal, and export to orthogonal mixer;Two The cascade low noise of grade will amplify the echo-signal, and export to power splitter;
The echo amplified signal that the low noise exports is divided into the two paths of signals of the phases such as constant amplitude by S220, power splitter, and is divided It Shu Chu not be to orthogonal mixer;
S230, orthogonal mixer carry out phase shift to the wireless signal that injection phase locking oscillator locks, and generate mutually orthogonal First locking signal and the second locking signal;First locking signal is mixed with the signal all the way that power splitter exports, by Two locking signals are mixed with the another way signal that power splitter exports;Obtain the frequency and echo-signal that frequency is wireless signal The high-frequency signal of the sum of frequency, the frequency that frequency is wireless signal and echo-signal frequency difference low frequency signal;By institute It states high-frequency signal and low frequency signal is exported to low-pass filter unit;
S240, low-pass filter unit filter out the high-frequency signal, obtain the first baseband signal and the second baseband signal.
In the contactless gesture identification method, the step S210 further include: delay unit is to the echo Signal is delayed, and the echo-signal after making delay keeps one with the wireless signal that have passed through injection phase locking oscillator in time It causes, the echo-signal after delay is exported to the low noise.
Since the principle of the contactless gesture identification method, feature have been explained in detail in the above system embodiment It states, details are not described herein.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to the guarantor of appended claims of the invention Protect range.

Claims (8)

1. a kind of contactless gesture recognition system, which is characterized in that the system comprises:
Signal transmitting and receiving module, for emitting wireless signal and receives echo-signal to detected material, also by the wireless communication Number and received echo-signal 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 demodulates The second obtained baseband signal is to gesture recognition module;
The injection phase-locking quadrature receiving module includes: injection phase locking oscillator, for lock the wireless signal frequency and Phase, and export to orthogonal mixer;
The low noise of two-stage cascade for that will amplify to the echo-signal, and is exported to power splitter;
Power splitter, the echo amplified signal for exporting the low noise are divided into the two paths of signals of the phases such as constant amplitude, and defeated respectively Out to orthogonal mixer;
Orthogonal mixer, the wireless signal for locking to injection phase locking oscillator carry out phase shift, generate mutually orthogonal first Locking signal and the second locking signal;First locking signal is mixed with the signal all the way that power splitter exports, by the second lock Determine signal and is mixed with the another way signal that power splitter exports;Obtain the frequency of frequency and echo-signal that frequency is wireless signal The low frequency signal of the difference of the frequency of the high-frequency signal of the sum of rate, the frequency that frequency is wireless signal and echo-signal;By the height Frequency signal and low frequency signal are exported to low-pass filter unit;
Low-pass filter unit obtains the first baseband signal and the second baseband signal for filtering out the high-frequency signal;
Gesture recognition module judges for being changed according to 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, which is characterized in that the signal transmitting receives mould Block includes:
The wireless communication signals of capture are exported and are coupled to branch line for capturing external wireless communication signals by receiving antenna Device;
Transmitting antenna, for emitting 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 exporting the wireless communication signals to transmitting antenna and injection phase-locking quadrature receiving module; The echo-signal for the doppler information with detected material that transmitting antenna receives is exported and gives injection phase-locking quadrature receiving mould Block.
3. contactless gesture recognition system according to claim 2, which is characterized in that the receiving antenna and transmitting Antenna orthogonal.
4. contactless gesture recognition system according to claim 1, which is characterized in that the injection phase-locking just joins Receiving module further includes delay unit, for being delayed to the echo-signal, making the echo-signal after being delayed and have passed through note The wireless signal for entering phase-locked oscilaltor is consistent in time, and the echo-signal after delay is exported to the low noise.
5. a kind of contactless gesture identification method, which is characterized in that described method includes following steps:
A, signal transmitting and receiving module emits wireless signal and receives echo-signal to detected material;
B, injection phase-locking quadrature receiving module locks the phase of the wireless signal, after the echo-signal and locking phase Wireless signal carry out quadrature demodulation, the first baseband signal for demodulating of output in-phase branch and quadrature branch demodulate to obtain The second baseband signal;
The step B specifically comprises the following steps:
B1, injection phase locking oscillator lock the frequency and phase of the wireless signal, and export to orthogonal mixer;Two-stage cascade Low noise the echo-signal will be amplified, and export to power splitter;
The echo amplified signal that the low noise exports is divided into the two paths of signals of the phases such as constant amplitude by B2, power splitter, and is exported respectively To orthogonal mixer;
B3, orthogonal mixer carry out phase shift to the wireless signal that injection phase locking oscillator locks, and generate the first mutually orthogonal lock Determine signal and the second locking signal;First locking signal is mixed with the signal all the way that power splitter exports, by the second locking Signal is mixed with the another way signal that power splitter exports;Obtain the frequency of frequency and echo-signal that frequency is wireless signal The sum of high-frequency signal, frequency be wireless signal frequency and echo-signal frequency difference low frequency signal;By the high frequency Signal and low frequency signal are exported to low-pass filter unit;
B4, low-pass filter unit filter out the high-frequency signal, obtain the first baseband signal and the second baseband signal;
C, gesture recognition module changes according to the signal amplitude of first baseband signal and the second baseband signal to judge State the moving direction of detected material.
6. contactless gesture identification method according to claim 5, which is characterized in that the step A is specifically included Following steps:
Wireless communication signals outside A1, receiving antenna capture, the wireless communication signals of capture 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 emit the wireless communication signals to detected material and receive the doppler information with detected material Echo-signal exports the echo-signal to branch line coupler;
A4, the branch line coupler, which export the echo-signal, gives injection phase-locking quadrature receiving module.
7. contactless gesture identification method according to claim 6, which is characterized in that the receiving antenna and transmitting Antenna orthogonal.
8. contactless gesture identification method according to claim 5, which is characterized in that the step B1 further include: Delay unit is delayed to the echo-signal, makes the echo-signal after being delayed and have passed through the wireless of injection phase locking oscillator Signal is consistent in time, and the echo-signal after delay is exported to the low noise.
CN201611003899.8A 2016-11-15 2016-11-15 A kind of contactless gesture identification method and system Active CN106774825B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611003899.8A CN106774825B (en) 2016-11-15 2016-11-15 A kind of contactless gesture identification method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611003899.8A CN106774825B (en) 2016-11-15 2016-11-15 A kind of contactless gesture identification method and system

Publications (2)

Publication Number Publication Date
CN106774825A CN106774825A (en) 2017-05-31
CN106774825B true CN106774825B (en) 2019-07-09

Family

ID=58968189

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201611003899.8A Active CN106774825B (en) 2016-11-15 2016-11-15 A kind of contactless gesture identification method and system

Country Status (1)

Country Link
CN (1) CN106774825B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022148733A1 (en) * 2021-01-07 2022-07-14 Signify Holding B.V. Detection system and method for detecting motion of a subject

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109144276A (en) * 2018-09-28 2019-01-04 宁波视睿迪光电有限公司 A kind of gesture identification equipment, method and system
TWI690720B (en) * 2019-01-30 2020-04-11 昇雷科技股份有限公司 Noncontact vibration sensor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103070728A (en) * 2013-02-06 2013-05-01 南京理工大学 Non-contact type vital sign monitoring equipment
CN105718064A (en) * 2016-01-22 2016-06-29 南京大学 Gesture recognition system and method based on ultrasonic waves
CN105786185A (en) * 2016-03-12 2016-07-20 浙江大学 Non-contact type gesture recognition system and method based on continuous-wave micro-Doppler radar

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10389778B2 (en) * 2012-01-23 2019-08-20 Time Warner Cable Enterprises Llc Transitioning video between devices using touch gestures

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103070728A (en) * 2013-02-06 2013-05-01 南京理工大学 Non-contact type vital sign monitoring equipment
CN105718064A (en) * 2016-01-22 2016-06-29 南京大学 Gesture recognition system and method based on ultrasonic waves
CN105786185A (en) * 2016-03-12 2016-07-20 浙江大学 Non-contact type gesture recognition system and method based on continuous-wave micro-Doppler radar

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022148733A1 (en) * 2021-01-07 2022-07-14 Signify Holding B.V. Detection system and method for detecting motion of a subject

Also Published As

Publication number Publication date
CN106774825A (en) 2017-05-31

Similar Documents

Publication Publication Date Title
CN106774825B (en) A kind of contactless gesture identification method and system
CN105786185B (en) Non-contact gesture identifying system and method based on continuous wave micro-doppler radar
US10579150B2 (en) Concurrent detection of absolute distance and relative movement for sensing action gestures
CN107037495B (en) A kind of ultra wide band bimodulus millimeter wave active-passive composite detector
US20160187475A1 (en) Motion detection device
US11329516B2 (en) Charging method and apparatus
CN105677019B (en) A kind of gesture identification sensor and its working method
WO2012094825A1 (en) Method for locating tag by radio frequency identifying reader and radio frequency identifying reader
TWI634344B (en) 3d trajectory detection system
Wang et al. Gesture sensing using retransmitted wireless communication signals based on Doppler radar technology
US10380896B2 (en) Characterizing proximity risks within a radio mesh
Li et al. RFID harmonic for vibration sensing
CN207882440U (en) One kind being used for automobile active anticollision millimetre-wave radar system
CN110581716B (en) Physiological sign sensor capable of resisting clutter
US20080317098A1 (en) Low Power Radio Device With Reduced Interference
CN107064900A (en) A kind of straight coupling ripple of continuous wave through-wall radar transition is without control type canceller
AU2019201578A1 (en) Method and system for health monitoring using amplitude modulated continuous wave microwave signal
Fan et al. Hand gesture recognition based on Wi-Fi chipsets
AU2005227369B2 (en) Reader device for contactless reading of transponder data
CN109032354B (en) Electronic device, gesture recognition method thereof and computer-readable storage medium
Lai et al. Finger gesture sensing and recognition using a Wi-Fi-based passive radar
US11860294B2 (en) Electromagnetic vector sensors for a smart-device-based radar system
US20180217247A1 (en) A Proximity Detector
TWI756993B (en) Vital-sign radar sensor using wireless internet signal
WO2020093068A1 (en) Systems and methods for identifying electronic devices

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant