CN103777203B - Microwave action detector - Google Patents
Microwave action detector Download PDFInfo
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- CN103777203B CN103777203B CN201210488286.3A CN201210488286A CN103777203B CN 103777203 B CN103777203 B CN 103777203B CN 201210488286 A CN201210488286 A CN 201210488286A CN 103777203 B CN103777203 B CN 103777203B
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- 230000035945 sensitivity Effects 0.000 description 11
- 238000001514 detection method Methods 0.000 description 9
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
- G01S13/583—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The microwave motion detector comprises: the transmitting device transmits a microwave signal to a space to be detected; a receiving device for receiving the reflected microwave signal reflected by the space to be measured; the signal processing device is used for processing the reflected microwave signal received by the receiving device so as to judge whether the space to be detected has disturbance or not, and the signal processing device generates the microwave signal; and a path switching device, coupled to the signal processing device and the transmitting device, for causing the plurality of transmitting paths through which the microwave signal passes to have different phase shifts.
Description
Technical field
The present invention relates to a kind of microwave motion detector.
Background technology
Motion detector is usually used in saving from damage supervision or personnel's identification application on the scene. Generally, realize action with infrared technologyDetector. But infrared technology is easily judged by accident because of ambient temperature effect, even cannot detect.
The utilization of microwave type motion detector is the general principle of strangling all, relatively transmits and receives the phase difference between signal. IfPhase difference changes, and represents and in environment, has disturbing source.
But, although traditional microwave formula motion detector framework is simple, need to solve sensing Zeroes. Now please refer to figure1, it shows the sensing sensitivity change curve of traditional microwave formula motion detector. In Fig. 1, transverse axis is distance, and the longitudinal axisIt is sensing sensitivity. That is sent by detector 100 transmits after running into determinand 110, can be reflected into as receivingSignal. As seen from Figure 1, in the place of sensing zero point (that is sensing sensitivity is 0), cannot sensing (that is, if determinand110 are positioned at sensing part at zero point, and detector 100 cannot sense determinand 110). Sensing phenomenon at zero point is all general strangling of single-frequencyThe common fault of framework, cannot detect in these positions, and repeats with the cycle of per quart electromagnetic wavelength. On the contraryGround, is peaked place at sensing sensitivity, is best sensing points.
In addition, microwave type motion detector adopts with frequency continuous wave mode simultaneously and detects. In measurement process, profitCarry out frequency reducing with mixer, therefore can produce the accurate skew in direct current position (dcoffset) problem, cause receiver by powerful direct current signalPour into, cause saturated and signal cannot be detected. If can solve, than the effect that is easier to reach stable detection.
Summary of the invention
The object of the present invention is to provide a kind of microwave motion detector, it is more stable that it detects effect, is difficult for because of externalThe variation of environment and cause and receive bad result that cannot interpretation, and can effectively solve the dynamic range of traditional radar receiverSaturated problem.
According to an example embodiment of the present invention, a kind of microwave motion detector is proposed, comprising: emitter, transmittingMicrowave signal is to space to be measured; Receiving system, receives the reflected microwave signal being reflected back by this space to be measured; Signal processing devicePut, process this reflected microwave signal that this receiving system receives, to judge in this space to be measured whether have disturbance, this signal placeReason device produces this microwave signal; And path switching device, be coupled to this signal processing apparatus and this emitter, this pathSwitching device shifter make this microwave signal multiple transmission paths of process there is different phase shift.
According to another example embodiment of the present invention, a kind of microwave motion detector is proposed, comprising: emitter, send outPenetrate microwave signal to space to be measured; Receiving system, receives the reflected microwave signal being reflected back by this space to be measured; Switch in pathDevice, is coupled to this receiving system, this path switching device make this reflected microwave signal multiple RX paths of process haveDifferent phase shift; And signal processing apparatus, process this reflected microwave signal that this receiving system receives, to judge that this treatsSurvey in space whether have disturbance, this signal processing apparatus produces this microwave signal.
According to a more example embodiment of the present invention, a kind of microwave motion detector is proposed, comprising: R-T unit, send outPenetrate microwave signal to space to be measured, and receive the reflected microwave signal being reflected back by this space to be measured; Signal processing apparatus, locatesManage this reflected microwave signal that this R-T unit receives, to judge in this space to be measured whether have disturbance, this signal processing deviceBuy property and give birth to this microwave signal; And path switching device, being coupled to this signal processing apparatus and this R-T unit, switch in this pathDevice make this microwave signal and this reflected microwave signal multiple paths of process there is different phase shift.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Brief description of the drawings
Fig. 1 shows the sensing sensitivity change curve of traditional microwave formula motion detector;
Fig. 2 shows the functional-block diagram of microwave motion detector according to an embodiment of the invention;
Fig. 3 A shows according to the exemplary embodiment of the delay path switch unit of the embodiment of the present invention;
Fig. 3 B shows the sensing sensitivity variation schematic diagram according to the embodiment of the present invention;
Fig. 4 A and Fig. 4 B show according to the path switching controls sequential chart of the present embodiment;
Fig. 5 A and Fig. 5 B show respectively the function square frame signal according to the microwave motion detector of other embodiments of the inventionFigure.
Wherein, Reference numeral
100,300: detector 110,310: determinand
200,500A, 500B: microwave motion detector
210: transmit antenna
220,520A, 520B: delay path switch unit
225: phase-locked loop (signal processing apparatus)
230: phase/frequency detection unit
240: charge pump 250: low pass filter
260: double-ended control voltage controlled oscillator
270: reception antenna 280: path switch controller
P1, P2: path 510: antenna
Detailed description of the invention
Below in conjunction with accompanying drawing, structural principle of the present invention and operation principle are described in detail:
The embodiment of the present invention proposes a microwave type motion detector framework, and it uses all general principles of strangling. In the invention processExample, highly sensitive self-injection locking voltage controlled oscillator is receiving all general phase modulated signals of strangling that reflected by determinandTime, can produce corresponding output phase or frequency disturbance. Utilize phase-locked loop to lock the defeated of this injection locking voltage controlled oscillatorGo out frequency, can make external world's (determinand) disturbance information be reflected into the control end voltage of injection locking voltage controlled oscillator, and fix defeatedGo out frequency to reduce frequency range demand and electromagnetic interference.
The embodiment of the present invention is switched the transmission/reception path that tool out of phase is moved, and makes the sensing in these transmission/reception pathsDead-center position not overlapping (or even the sensing dead-center position in these transmission/reception paths is interlocked), to eliminate all general strangling of single-frequencyThe sensing phenomenon at zero point of radar. The complementary benefit of the sensing sensitivity tool in these transmission/reception paths, also a path even whereinIn the time of sensing zero point, other paths can be in sensing zero point, therefore can be by stable the disturbance of determinand detecting.
The embodiment of the present invention, in the time detecting low frequency action/disturbing signal, can be closed the road that transmits in the non-sample point periodFootpath, reduces average microwave transmitting power in principle.
The embodiment of the present invention utilizes double-ended control voltage controlled oscillator to adjust direct current position standard, to eliminate the accurate skew in direct current position.Its physical principle is to add another Control of Voltage port and another voltage variable capacitor. Change the resonance of oscillator resonant cavityFrequency, allows the direct current position standard of output signal of phase-locking type oneself injection locking double-ended control voltage controlled oscillator recall to original startValue.
Fig. 2 shows the functional-block diagram of microwave motion detector according to an embodiment of the invention. As shown in Figure 2, microwaveMotion detector 200 comprises: at least one transmission antenna 210, delay path switch unit 220, phase-locked loop 225 and at least one connecingReceive antenna 270. Phase-locked loop 225 comprises: phase/frequency detection unit (PhaseFrequencyDetector, PFD) 230,Charge pump (ChargePump, CP) 240, low pass filter (LowPassFilter, LPF) 250 shake with double-ended control is voltage-controlledSwing device 260. In this case embodiment, phase-locked loop can be described as again signal processing apparatus. Microwave motion detector 200 also can be selectedProperty comprises path switch controller 280.
Transmit antenna 210 in order to send out microwave signal, that reception is reflected back by determinand reception antenna 270 is micro-Ripple signal.
Delay path switch unit 220, in order to switch different delay paths, (also moves so that mulitpath has out of phaseThere is phase difference in mulitpath, to each other). So, can select different delay paths to treat as signal transmission path. ?Under, explain as example to switch two different delay paths, but when knowing that this case is not limited to this. This case also can form manyThe different paths that postpone of tool, and switch between these different delay paths.
Now please refer to Fig. 3 A, it shows according to the exemplary embodiment of the delay path switch unit 220 of the embodiment of the present invention.As shown in Figure 3A, delay path switch unit 220 comprises: delay cell D, switch SW 1 and SW2. Switch SW 1 and SW2 such as butBe not limited to as single-pole double throw (SPDT, SinglePoleDoubleThrow) switch. Delay cell D is such as being by signalPhase delay is for example 90 degree. That is the phase difference between path P 1 and P2 is for example 90 degree.
Now please refer to Fig. 3 B, it shows the sensing sensitivity variation schematic diagram according to the embodiment of the present invention, and its transverse axis is distanceFrom, the longitudinal axis is sensing sensitivity. Can be found out by Fig. 3 B, owing to having two different delay paths, the sensing zero of this two pathsPoint position differs from one another. So prior art causes the shortcoming of detector senses less than determinand because of sensing zero point, at thisIn inventive embodiments, can be solved. In detail, if determinand 310 is positioned at the sense on the wherein paths of detector 300Survey zero point, this determinand 310 is by the sensing zero point that can not be positioned on another paths.
Now go back to Fig. 2. Double-ended control voltage controlled oscillator 260 is controlled in phase-locked loop 225. Phase-locked loop 225 also can be described asSignal processing apparatus. The details of phase-locked loop 225 is as follows. In order to detect, double-ended control is voltage-controlled shakes in phase/frequency detection unit 230Swing the output signal of device 260 and the defeated phase difference (or difference on the frequency) of reference signal REF.
Charge pump 240 is according to the testing result of phase/frequency detection unit 230 and output voltage signal. Charge pump 240Output voltage signal passes through the filtering of low pass filter 250 and becomes the first control voltage VCO_CN1. This first control voltageVCO_CN1 is in order to control the frequency of output signal of double-ended control voltage controlled oscillator 260.
Double-ended control voltage controlled oscillator 260 is injection locking pressure control oscillator structure. Double-ended control voltage controlled oscillator 260Output signal and injection simultaneously (that is reception) signal. In other possibilities embodiment, double-ended control voltage controlled oscillator 260Output signal can be connected to through power divider (not shown) input and the phase-locked loop of delay path switch unit 220225 input. After the output microwave signal of double-ended control voltage controlled oscillator 260 is passed through delay path switch unit 220, byTransmitting antenna 210 is emitted to determinand/space to be measured.
If there is disturbing signal (this disturbance is such as being human body heartbeat, human body respiration, window vibration etc.) in space to be measured, transmittingWhen signal is reflected, due to general effects of strangling all, make the phase place of reflected signal or frequency can change (with respect to transmitting). ShouldReflected signal receives via reception antenna 270, and can after amplifying, (amplifier is not shown) be injected into that double-ended control is voltage-controlled shakesSwing device 260. Double-ended control voltage controlled oscillator 260 is because reflective signal effects makes phase place or the frequency variation of its output signal.The phase place of the output signal of double-ended control voltage controlled oscillator 260 or frequency shift amount enter behind phase-locked loop 225, phase-locked loop225 can produce corresponding first for this phase place or change of frequency controls voltage VCO_CN1 double-ended control is voltage-controlled shakes to reviseThe output frequency that swings device 260 returns reference frequency. Observe this first control voltage VCO_CN1 and can learn external disturbance information.
In addition, in the present embodiment, second of double-ended control voltage controlled oscillator 260 is controlled voltage VCO_CN2 can be in order to disappearExcept the accurate skew in its direct current position. The concussion frequency of double-ended control voltage controlled oscillator 260 is controlled voltage VCO_CN1 and VCO_ by twoCN2 determines. If being subject to external disturbance effect of signals, causes by double-ended control voltage controlled oscillator 260 the first main control voltageWhen VCO_CN1 produces the accurate skew in direct current position, can list following equation (1) according to physical principle and calculate second of required variationControl voltage VCO_CN2, eliminate the accurate skew in direct current position of the first control voltage VCO_CN1. Wherein Kv1, it is normal that Kv2 is systemNumber is that designer can decide in its sole discretion.
Kv1*△VCO_CN1+Kv2*△VCO_CN2=0(1)
Wherein, △ VCO_CN1 and △ VCO_CN2 represent that respectively first and second controls voltage VCO_CN1 and VCO_CN2Voltage variety.
Can be released by above formula (1):
If detect when the main first direct current mean value of controlling voltage VCO_CN1 changes, can comply with upper formulation (1)Obtain the second required control voltage VCO_CN2 variable quantity with (2). For example but be not limited to, constant K v1 is 2MHz/V and Kv2For 20MHz/V. If system detects when the main first direct current mean variation of controlling voltage VCO_CN1 is 1V, can comply with upperFormulation (1) obtains the second control voltage VCO_CN2 variable quantity with (2). That is, by the second control voltage VCO_CN2 downgrades 0.1V and accurate the direct current position of the first control voltage VCO_CN1 skew can be eliminated. That is this first control voltage VCO_The accurate skew in direct current position of the external disturbance information of CN1 representative is eliminated.
On the implementation, the implementation of double-ended control voltage controlled oscillator 260 can be in traditional VCO and adds a Control of VoltagePort and a voltage variable capacitor (varactor). The resonant frequency that changes resonant cavity allows control phase-locking type oneself and injects lockDetermine the first direct current position standard of controlling voltage of oscillator (double-ended control voltage controlled oscillator 260) and recall to original start value. So, noNeed additionally add complicated control loop and RF component. Adopting said method can effectively solve the dynamic model of traditional radar receiverEnclose saturated problem (accurate skew institute causes due to direct current position), make the detection effect of microwave detector more stable, be difficult for because of outsideCause in the variation of environment and receive bad result that cannot interpretation.
Now please refer to Fig. 4 A and Fig. 4 B, it shows according to the path switching controls sequential chart of the present embodiment. In Fig. 4 A, cutChange path P 1 and P2, so can timesharing reception/transmission two path P1 and the sensing signal of P2, to avoid being subject to the sensing because of pathZeroes.
In addition, if the disturbance of institute's detected object belong at a slow speed low frequency signal (such as, mankind's heartbeat/breathing be about 72 times/Minute, it is about 1.2Hz), the embodiment of the present invention also can reduce transmitting power. As shown in Figure 4 B, for example but be not limited to roadBe about 1ms the launch time of footpath P1 and P2. Be about 48ms without transmitting the period (within without the transmission period, not launching microwave signal), average frequency is 20Hz, it is far above the forcing frequency of object under test. Hence one can see that, in the present embodiment, and at two-wayTransmission path can be closed outside sample time separately in footpath, to reduce average transmit power but still do not detract detection sensitivity. Fig. 4 ACan be controlled by path switch controller (as shown in Figure 2) with the switching sequence of Fig. 4 B. This path switch controller can send manyIndividual switch controlling signal, carrys out the multiple switches in the switch unit of control lag path.
Fig. 5 A and Fig. 5 B show respectively the function square frame signal according to the microwave motion detector of other embodiments of the inventionFigure. Comparison diagram 5A and Fig. 2 can learn, in the microwave motion detector 500A of Fig. 5 A, delay path switch unit 520A isIn order to switch different delay paths on RX path. Comparison diagram 5B and Fig. 2 can learn, at the microwave motion detector of Fig. 5 BIn 500B, its single antenna 510 for receiving and transmitting microwave signal, but is different from Fig. 2, the delay path in Fig. 5 B simultaneouslyThe toggle path phase shift of switch unit 520B is for example 45 degree.
In addition, those skilled in the art are when learning, above-described embodiment of this case can be combined, and it is all in this case spiritIn scope. Such as, this case again another may embodiment in, can delay path be all set on transmission path and RX path and cutChange unit, to switch respectively transmission path and RX path, its details can be learnt by above-mentioned discussion, not repeat in this.
The embodiment of the present invention is applicable to detection, for example but be not limited to human breathing, mankind's heartbeat, disturbance, vibration(such as window vibration) etc.
In addition, although the embodiment of the present invention proposes toggle path delayed mode with all Pu Lelei of self-injection locking formula that arrange in pairs or groupsReach, but the toggle path delayed mode of the embodiment of the present invention also can be applicable to all general radar frameworks of strangling of other single-frequency.
From the above, the above-mentioned multiple embodiment of the present invention at least have following advantage:
In embodiments of the present invention, for solve sensing Zeroes (that is, cannot sense the external world in some position and disturbMoving), utilize and switch the transmission/reception path that tool out of phase is moved, make the sensing dead-center position in these transmission/reception paths not heavyFolded (or even the sensing dead-center position in these transmission/reception paths is interlocked). Thus, tested object is at almost eachPut all in good sensing sensitivity, to eliminate sensing phenomenon at zero point. That is to say the sensing in these transmission/reception pathsSensitivity can be complementary.
In addition,, if detect low frequency action/disturbing signal, the embodiment of the present invention can be utilized lower sampling frequency stillBe enough to detect disturbance. Even, external emitting radio waves can be do not needed in the non-sample point period, average sending out can be further effectively reducedPenetrate power, more can be in actual use, reduce microwave to the hurtful misgivings of human-body safety.
The embodiment of the present invention utilizes double-ended control voltage controlled oscillator to adjust direct current position standard, to eliminate the accurate skew in direct current position,And do not need additionally to add complicated control loop and RF component. The detection effect of the microwave detector of the embodiment of the present invention moreStable, be difficult for receiving bad result that cannot interpretation because the variation of external environment causes. The embodiment of the present invention can effectively solveThe saturated problem of dynamic range of tradition radar receiver.
Certainly, the present invention also can have other various embodiments, in the situation that not deviating from spirit of the present invention and essence thereof, ripeKnow those skilled in the art when making according to the present invention various corresponding changes and distortion, but these corresponding changes and changeShape all should belong to the protection domain of the appended claim of the present invention.
Claims (11)
1. a microwave motion detector, is characterized in that, comprising:
Emitter, launched microwave signal is to space to be measured;
Receiving system, receives the reflected microwave signal being reflected back by this space to be measured;
Whether signal processing apparatus, processes this reflected microwave signal that this receiving system receives, to judge in this space to be measuredHave disturbance, this signal processing apparatus produces this microwave signal; And
Path switching device, is coupled to this signal processing apparatus and this emitter, and this path switching device makes this microwave signalMultiple transmission paths of process there is different phase shift, multiple sensings of those transmission paths do not overlap each other zero point.
2. microwave motion detector according to claim 1, is characterized in that, also comprises path switch controller, couplesTo this path switching device, to select one of those transmission paths.
3. microwave motion detector according to claim 2, is characterized in that, this path switch controller is at part-timeClose those transmission paths.
4. microwave motion detector according to claim 1, is characterized in that,
This signal processing apparatus at least comprises double-ended control voltage controlled oscillator, produces this microwave signal;
Relatively this microwave signal and reference signal are to obtain the first control voltage for this signal processing apparatus, and first to control voltage anti-for thisReflect the external disturbance information in this space to be measured;
The concussion frequency of this double-ended control voltage controlled oscillator is controlled voltage by this first control voltage and second and is determined; And
If being subject to this external disturbance informational influence, this double-ended control voltage controlled oscillator make this first control voltage produce direct current positionAccurate skew, this signal processing apparatus produces this according to this first first voltage variety of controlling voltage and second controls the of voltageTwo voltage varieties, eliminate this first direct current position standard of controlling voltage and are offset.
5. a microwave motion detector, is characterized in that, comprising:
Emitter, launched microwave signal is to space to be measured;
Receiving system, receives the reflected microwave signal being reflected back by this space to be measured;
Path switching device, is coupled to this receiving system, this path switching device make this reflected microwave signal process multipleRX path has different phase shift, and multiple sensings of those RX paths do not overlap each other zero point; And
Whether signal processing apparatus, processes this reflected microwave signal that this receiving system receives, to judge in this space to be measuredHave disturbance, this signal processing apparatus produces this microwave signal.
6. microwave motion detector according to claim 5, is characterized in that, also comprises path switch controller, couplesTo this path switching device, to select one of those RX paths.
7. microwave motion detector according to claim 5, is characterized in that,
This signal processing apparatus at least comprises double-ended control voltage controlled oscillator, produces this microwave signal;
Relatively this microwave signal and reference signal are to obtain the first control voltage for this signal processing apparatus, and first to control voltage anti-for thisReflect the external disturbance information in this space to be measured;
The concussion frequency of this double-ended control voltage controlled oscillator is controlled voltage by this first control voltage and second and is determined; And
If being subject to this external disturbance informational influence, this double-ended control voltage controlled oscillator make this first control voltage produce direct current positionAccurate skew, this signal processing apparatus produces this according to this first first voltage variety of controlling voltage and second controls the of voltageTwo voltage varieties, eliminate this first direct current position standard of controlling voltage and are offset.
8. a microwave motion detector, is characterized in that, comprising:
R-T unit, launched microwave signal is space to be measured extremely, and receives the reflected microwave signal being reflected back by this space to be measured;
Whether signal processing apparatus, processes this reflected microwave signal that this R-T unit receives, to judge in this space to be measuredHave disturbance, this signal processing apparatus produces this microwave signal; And
Path switching device, is coupled to this signal processing apparatus and this R-T unit, and this path switching device makes this microwave signalFrom this reflected microwave signal multiple paths of process there is different phase shift, multiple sensing zero point in those paths is not each otherOverlapping.
9. microwave motion detector according to claim 8, is characterized in that, also comprises path switch controller, couplesTo this path switching device, to select one of those paths.
10. microwave motion detector according to claim 9, is characterized in that, this path switch controller is in the time of partBetween close those paths.
11. microwave motion detectors according to claim 8, is characterized in that,
This signal processing apparatus at least comprises double-ended control voltage controlled oscillator, produces this microwave signal;
Relatively this microwave signal and reference signal are to obtain the first control voltage for this signal processing apparatus, and first to control voltage anti-for thisReflect the external disturbance information in this space to be measured;
The concussion frequency of this double-ended control voltage controlled oscillator is controlled voltage by this first control voltage and second and is determined; And
If being subject to this external disturbance informational influence, this double-ended control voltage controlled oscillator make this first control voltage produce direct current positionAccurate skew, this signal processing apparatus produces this according to this first first voltage variety of controlling voltage and second controls the of voltageTwo voltage varieties, eliminate this first direct current position standard of controlling voltage and are offset.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101138273A TWI480836B (en) | 2012-10-17 | 2012-10-17 | Mocrowave motion sensor |
| TW101138273 | 2012-10-17 |
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| CN103777203A CN103777203A (en) | 2014-05-07 |
| CN103777203B true CN103777203B (en) | 2016-05-25 |
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| US10411716B2 (en) * | 2016-06-06 | 2019-09-10 | Richwave Technology Corp. | Subsampling motion detector for detecting motion of object under measurement |
| TWI616669B (en) * | 2017-02-07 | 2018-03-01 | 國立中山大學 | Quadrature self-injection-locked radar |
| TWI743570B (en) | 2019-10-09 | 2021-10-21 | 國立中山大學 | Multi-target vital sign detector and detection method thereof |
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|---|---|
| TW201417052A (en) | 2014-05-01 |
| TWI480836B (en) | 2015-04-11 |
| CN103777203A (en) | 2014-05-07 |
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