CN106405542A - Life sign detection processing method and system based on continuous waves, and life detector - Google Patents
Life sign detection processing method and system based on continuous waves, and life detector Download PDFInfo
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- CN106405542A CN106405542A CN201610883268.3A CN201610883268A CN106405542A CN 106405542 A CN106405542 A CN 106405542A CN 201610883268 A CN201610883268 A CN 201610883268A CN 106405542 A CN106405542 A CN 106405542A
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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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- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The invention discloses a life sign detection processing method and system based on continuous waves, and a life detector. The life sign detection processing method based on the continuous waves comprises the following steps: A, a life detector emitting continuous wave signals to irradiate a life body, receiving echo signals reflected by the life body, and according to the emitted continuous wave signals and the echo signals, obtaining baseband signals; B, a data acquisition card converting the obtained baseband signals into digital signals; and C, a computer, after filtering the digital signals after conversion, extracting breathing signal waveforms and calculating a respiration rate. The life sign detection processing method based on the continuous waves, provided by the invention, improves the detection distance, the detection sensitivity and the velocity measurement precision through detecting life signs by use of the continuous waves; the breathing signal waveforms after filtering are extracted by use of the computer, and the respiration rate is calculated, such that the processing difficulty of life sign signals is reduced.
Description
Technical field
The present invention relates to life-detection instrument technical field, more particularly, to a kind of vital signs detection based on continuous wave
Processing method, system and life-detection instrument.
Background technology
What the detection of life signal was commonly used has two ways：Contact and contactless.Compare the measuring method of contact,
Contactless measurement means have many good qualities：Longer-distance detection can be carried out to the life signal of human body；Can be not on the same day
Measure under gas and orographic condition；Avoid and wear electrode slice or Sensor Problem, this is tool for extending the monitoring time
Significant so that continuous monitoring becomes possibility.Therefore, contactless metering system receive more and more
Country attention, it can realize the positioning to life entity, quantity identification and physiologic information extraction, military operation,
After struggle against terror, calamity, the field such as wounded's search, medical treatment ＆ health monitoring has a wide range of applications and important Research Significance.
And existing contactless life signal detection mode is according to the difference using equipment and operation principle, can divide again
For：Light wave detection, infrared detection and three kinds of ultrasound detection.
And existing three kinds of non-contact detection methods all have different weak points：
Optical flow method calculates complexity and anti-noise ability is poor, needs corresponding hardware supported, is not suitable for the people under complicated environmental condition
Body physiologic information detects；Infrared imagery technique is easily influenced by ambient temperature, does not have penetrability；Although and ultrasonic can be certain
The feature of illness is identified on degree, but the clothes with measured can cause to sound wave to scatter and absorb, and clothes material is not
With, testing result also can have differences, simultaneously ultrasonic decay in air borne larger.
Therefore, prior art has yet to be improved and developed.
Content of the invention
In view of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of detection range is remote, detection sensitivity
High and rate accuracy is high, and vital sign signals process vital signs detection processing method simply based on continuous wave, system
And life-detection instrument.
Technical scheme is as follows：
A kind of vital signs detection processing method based on continuous wave, wherein, described based on the vital signs detection of continuous wave at
Reason method includes：
Step A：Life-detection instrument transmitting continuous wave signal irradiates life entity, receives the echo-signal being reflected by life entity, and root
Obtain baseband signal according to launched continuous wave signal and echo-signal；
Step B：Obtained baseband signal is converted to data signal by data collecting card；
Step C：Computer extracts wherein breath signal waveform after institute's conversion digital signal is filtered, and calculates respiratory rate.
Preferably, the described vital signs detection processing method based on continuous wave, wherein, described step A specifically includes：
Step A1：Oscillator tranmitting frequency is the continuous wave signal of 24GHz；
Step A2：Continuous wave signal is divided into two-way, a road is transmission signal, launches by transmitting antenna；Another road is divided
Flow for I channel signal and Q channel signal, wherein, I channel signal enters I channel mixer, Q channel signal warp by I passage
After 90 ° of phase shifts, Q channel mixer is entered by Q passage；
Step A3：Reception antenna receives the echo-signal of life entity reflection；
Step A4：I channel mixer and Q channel mixer are respectively by the echo-signal being received and I channel signal and Q passage letter
Number mixing, obtain I passage mixed frequency signal and Q passage mixed frequency signal；
Step A5：Preamplifier is filtered enhanced processing to obtain to I passage mixed frequency signal and Q passage mixed frequency signal respectively
I baseband signal and Q baseband.
Preferably, the described vital signs detection processing method based on continuous wave, wherein, described step B is specially：
Obtained I baseband signal and Q baseband are converted to the first data signal and the second numeral by data collecting card respectively
Signal.
Preferably, the described vital signs detection processing method based on continuous wave, wherein, described step C specifically includes：
Step C1：First data signal and the second data signal are carried out high-pass filtering by high-pass filter respectively；
Step C2：Low pass filter carries out low pass filtered to the first data signal after high-pass filtering and the second data signal respectively
Ripple；
Step C3：Extract the breath signal waveform in the first data signal and the second data signal after LPF respectively, and right
Extracted breath signal waveform carries out Wave crest and wave trough detection under LabVIEW environment；
Step C4：Calculate instantaneous respiratory rate according to detected two adjacent crests or trough.
Preferably, the described vital signs detection processing method based on continuous wave, wherein, the described life based on continuous wave
Life feature detection processing method also includes：
Step D：Time-Frequency Analysis and contrast are carried out to the first data signal after LPF and the second data signal.
A kind of vital signs based on continuous wave detects processing system, and wherein, the described vital signs based on continuous wave is visited
Survey processing system to include：
Life-detection instrument, irradiates life entity for launching continuous wave signal, receives the echo-signal being reflected by life entity, and according to
Launched continuous wave signal and echo-signal obtain baseband signal；
The data collecting card being connected with described life-detection instrument, for being converted to data signal by obtained baseband signal；
The computer being connected with described data collecting card, for extracting wherein breathing letter after institute's conversion digital signal is filtered
Number waveform, and calculate respiratory rate.
Preferably, the described vital signs based on continuous wave detects processing system, and wherein, described life-detection instrument is concrete
Including：
Oscillator, for the continuous wave signal for 24GHz for the tranmitting frequency；
The transmitting antenna being connected with described oscillator, for launching the part continuous wave signal becoming transmission signal；
Reception antenna, for receiving the echo-signal of life entity reflection；
The I channel mixer being connected with described oscillator and reception antenna, for distributing from another part continuous wave signal
The I channel signal coming and the echo-signal mixing being received；
The Q channel mixer being connected with described oscillator and reception antenna, for distributing from another part continuous wave signal
The Q channel signal coming and the echo-signal mixing being received；
The preamplifier being connected with described I channel mixer and Q channel mixer, for respectively to I passage mixed frequency signal and Q
Passage mixed frequency signal is filtered enhanced processing to obtain I baseband signal and Q baseband.
Preferably, the described vital signs based on continuous wave detects processing system, wherein, described data acquisition fixture body
For：
Respectively obtained I baseband signal and Q baseband are converted to the first data signal and the second data signal.
Preferably, the described vital signs based on continuous wave detects processing system, and wherein, described computer specifically wraps
Include：
High-pass filter, for carrying out high-pass filtering by the first data signal and the second data signal respectively；
The low pass filter being connected with described high-pass filter, for respectively to the first data signal and second after high-pass filtering
Data signal carries out LPF；
The central processing unit being connected with described low pass filter, for extracting the first data signal and second after LPF respectively
Breath signal waveform in data signal, and Wave crest and wave trough inspection is carried out under LabVIEW environment to extracted breath signal waveform
Survey；And calculate instantaneous respiratory rate according to detected two adjacent crests or trough.
A kind of life detection being applied to the as above vital signs detection processing method based on continuous wave described in any one
Instrument, wherein, described life-detection instrument also includes：
For providing the pressure source of operating voltage.
Vital signs detection processing method based on continuous wave provided by the present invention, due to employing first with life
Survey meter transmitting continuous wave signal irradiates life entity, receives the echo-signal being reflected by life entity, and according to launched continuous wave
Signal and echo-signal obtain baseband signal；Then obtained baseband signal is converted to by numeral letter by data collecting card
Number；Extract wherein breath signal waveform after finally institute's conversion digital signal being filtered using computer, and calculate respiratory rate
Mode；Detect vital signs using continuous wave and improve detection range, detection sensitivity and rate accuracy；And use computer
Extract filtered breath signal waveform and calculate respiratory rate, reduce the intractability of vital sign signals.
Brief description
Fig. 1 is that the main flow of the vital signs detection processing method preferred embodiment in the present invention based on continuous wave is illustrated
Figure.
Fig. 2 is the principle of work and power frame that in the present invention, the vital signs based on continuous wave detects processing system preferred embodiment
Figure.
Fig. 3 is the functional schematic block diagram of life-detection instrument preferred embodiment in the present invention.
Specific embodiment
The present invention provides a kind of vital signs detection processing method based on continuous wave, system and life-detection instrument, for making
The purpose of the present invention, technical scheme and effect are clearer, clear and definite, referring to the drawings and give an actual example detailed further to the present invention
Describe in detail bright.It should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in figure 1, the invention provides a kind of vital signs detection processing method based on continuous wave, described based on even
The vital signs detection processing method of continuous ripple includes：
S100, life-detection instrument transmitting continuous wave signal irradiate life entity, receive the echo-signal being reflected by life entity, and according to
Launched continuous wave signal and echo-signal obtain baseband signal.
In the embodiment of the present invention, life-detection instrument is preferably continuous wave radar, and the radar of continuous transmitting electromagnetic wave referred to as connects
Continuous ripple radar；Continuous wave radar technology is based on micro-doppler analysis and signal processing technology, and this know-why is continuous wave radar
The electromagnetic beam of transmitting is irradiated to life entity（Especially human body）Target (is regarded life entity as uniform rigid body, is not considered electromagnetic wave
Propagation in human body）Afterwards, according to Doppler effect, because body surface fine motion net velocity is zero, the echo-signal of reflection be through
The backscatter signal of phase-modulation, the phase-modulation degree of this signal and body surface fine motion amplitude proportional are then echo-signal
The signal that mixing demodulation just can obtain comprising life parameters information is baseband signal.
Conventional continuous wave radar frequency band is chosen and be there is a contradiction：Tranmitting frequency is higher, then detection sensitivity is higher,
But detecting distance can decline with penetration capacity；On the contrary, tranmitting frequency is lower, then detection sensitivity is lower, but detecting distance
Can improve with penetration power.
In the embodiment of the present invention, in order to solve the contradiction of continuous wave radar frequency range selection, select the breath signal of life entity
Detected and processed, decreased the influence factor of complex barrier thing in detection process, reduced the requirement of detection penetration power.
When being embodied as, the continuous wave radar of preferably 24GHz single-frequency is life-detection instrument as signal transmitting and receiving front end.This thunder
Reach using planar microstrip array antenna structure, transmitting and reception consubstantiality, profile is very compact, not only power saving at work, and easily
It is integrated in various circuit.
Due to employing continuous wave radar, simplify the sensor construction in vital signs detection process, reduce life
Feature detection cost and power consumption relatively low so that the detection of vital signs be more prone to realize；Improve the life based on continuous wave
The detection range of feature detection processing method, detection sensitivity and rate accuracy, and its process no blurring effect, to moving-target
Separating capacity is strong, and transmitter frequency is high, and high power device power efficiency is high.
Obtained baseband signal is converted to data signal by S200, data collecting card.
When being embodied as, preference data capture card is multi-channel data acquisition board, more preferably：Have 16 tunnel simulations
Input（Single ended channels road inputs, and differential path road inputs）, 16 bit resolutions, have two digit counters and supplied by usb bus
The multi-channel data acquisition board of electricity.
Due to being to the extraction comparing faint breath signal, and respiratory rate ratio is relatively low, needs using compared with high-resolution
The converter of rate carries out analog-to-digital conversion to the base band data being obtained by radar.
S300, computer extract wherein breath signal waveform after institute's conversion digital signal is filtered, and calculate breathing
Rate.
The baseband signal that continuous wave radar obtains, after data set card carries out A/D conversion, is sent into by USB interface
In computer, under LabVIEW environment, then carry out Digital Signal Processing to extract breath signal waveform and to calculate respiratory rate.
Be substantially carried out under LabVIEW environment two-stage digital filtering, Wave crest and wave trough detection, the calculating of instantaneous respiratory rate and
Waveform shows.
Vital signs detection processing method based on continuous wave provided by the present invention, due to employing first with life
Survey meter transmitting continuous wave signal irradiates life entity, receives the echo-signal being reflected by life entity, and according to launched continuous wave
Signal and echo-signal obtain baseband signal；Then obtained baseband signal is converted to by numeral letter by data collecting card
Number；Extract wherein breath signal waveform after finally institute's conversion digital signal being filtered using computer, and calculate respiratory rate
Mode；Detect vital signs using continuous wave and improve detection range, detection sensitivity and rate accuracy；And use computer
Extract filtered breath signal waveform and calculate respiratory rate, reduce the intractability of vital sign signals.
Further, described S100 specifically includes：
S110, oscillator tranmitting frequency are the continuous wave signal of 24GHz.
When being embodied as, continuous wave radar is preferably band radar transceiver IPS-155, and preferably radar parameter is that plane is micro-
Band array antenna structure, and launch and receive consubstantiality setting, low-profile, by arranging above parameter so that radar is in work
In not only save energy consumption, the working time persistently, and easy of integration in various circuit.
S120, continuous wave signal is divided into two-way, a road is transmission signal, launches by transmitting antenna；Another road
Split into I channel signal and Q channel signal, wherein, I channel signal enters I channel mixer, Q channel signal warp by I passage
After 90 ° of phase shifts, Q channel mixer is entered by Q passage.
Preferably radar arrangement includes：Connection between signal source component, mixing output precision, signal transceiver module and three
Circuit.Wherein, signal source component includes：For launching the oscillator of Electromagnetic Continuous ripple and being used for providing operating voltage for radar
Pressure source；Mixing output precision includes：For by transmission signal（I channel signal and Q channel signal can be referred to herein）And acceptance letter
Number（Echo-signal can be referred to herein）The frequency mixer that is mixed and be used for preliminary filtering interfering and noise signal, limits signal band
Width, so that continuous wave radar avoids sensor to suffer from the preamplifier of static damage；Signal transceiver module includes：For launching
Part continuous wave signal is that transmission signal is gone out to detect the transmitting antenna of vital signs, and is reflected by life entity for receiving
Echo-signal reception antenna.
The pin of life-detection instrument, referred to continuous wave radar connects and power supply is preferred, and the power supply to radar, using GPS-
3303C direct voltage source provides+5V voltage, and the embodiment of the present invention can simplify pin setting, convenient and back-end circuit such as A/D conversion
Device etc. connects, and due to there being the presence of Enable Pin, can continuously be worked or discontinuous with control radar, preferably draw this
Pin is grounded.
S130, reception antenna receive the echo-signal of life entity reflection.
S140, I channel mixer and Q channel mixer are respectively by the echo-signal being received and I channel signal and Q passage
Signal is mixed, and obtains I passage mixed frequency signal and Q passage mixed frequency signal.
S150, preamplifier are filtered enhanced processing respectively to obtain to I passage mixed frequency signal and Q passage mixed frequency signal
To I baseband signal and Q baseband.
Further, described S200 is specially：
Obtained I baseband signal and Q baseband are converted to the first data signal and the second numeral by data collecting card respectively
Signal.
Further, described S300 specifically includes：
First data signal and the second data signal are carried out high-pass filtering by S310, high-pass filter respectively.
Life-detection instrument obtain I baseband signal and Q baseband through data collecting card carry out digital-to-analogue conversion be A/D conversion
Afterwards, separately or concurrently imported in computer by USB interface, baseline drift and flip-flop are removed by high-pass filter, excellent
Elect elliptic filter as.
According to respiratory rate scope 0.2Hz to 0.5Hz, remove the noise beyond this scope, so that apparent resolution life
The respiratory characteristic of life body, and this life entity present position and health status etc. are judged according to the respiratory characteristic of life entity.
When being embodied as, high-pass filter parameter is preferably：Filter order is 4 ranks, and sample frequency is 100Hz, passband
Cut-off frequency is 0.15Hz, and passband ripple is 0.1dB, and stopband cut-off frequency is 0.01Hz, and stopband attenuation is 95dB.
S320, low pass filter carry out low pass filtered to the first data signal after high-pass filtering and the second data signal respectively
Ripple.
The first data signal after high-pass filtering and the second data signal are carried out with LPF is mainly to remove noise
And High-frequency Interference, direct current biasing and the out-of-band noise jamming of breath signal can be removed by this step, pure to obtain
Breath signal, is further extraction breath signal waveform and calculating respiratory rate lays the foundation.
Low pass filter parameter is preferably：Filter order is 9 ranks, and sample frequency is 100Hz, and cut-off frequecy of passband is
0.6Hz, passband ripple is 0.1dB, and stopband cut-off frequency is 0.8Hz, and stopband attenuation is 76dB.
S330, the breath signal waveform extracting respectively in the first data signal and the second data signal after LPF, and
Wave crest and wave trough detection is carried out under LabVIEW environment to extracted breath signal waveform.
Under LabVIEW environment, preferentially come to exhaling using WA this VI module of Multiscale Peak Detection
Inhale the detection that waveform carries out Wave crest and wave trough.This module is to complete to detect using the method for wavelet decomposition, and its precision is higher, due to
Breath signal amplitude com parison is faint, it would be desirable to be amplified to it before entering this module of VI, to facilitate detection, in addition needs
Set the threshold value determining whether crest or trough, this value determines the accuracy of Wave crest and wave trough detection.This module is
Export eventually is position, amplitude and total quantity of crest or trough.
S340, instantaneous respiratory rate is calculated according to detected two adjacent crests or trough.
Obtaining the Wave crest and wave trough information of breath signal（Including amplitude, time location and total quantity）Afterwards, just
Can be according to two crests（Trough）Between interval obtaining instantaneous respiratory rate, its computing formula is as follows：
；
In this formula, fres represents instantaneous respiratory rate, and unit is beat/min, and S1, S2 is current peak time position respectively
Put and a upper peak time position.
In addition to aforesaid way it is also possible within the time of one minute, by counting crest（Trough）Number flat to obtain
All respiratory rates.For example within the time of 60 seconds, crest detection module counts a total of 20 crests, then average respiration is
20 beats/min.
Further, described also included based on the vital signs detection processing method of continuous wave：
S400, Time-Frequency Analysis and contrast are carried out to the first data signal after LPF and the second data signal.
The baseband signal of collection is filtered processing, filters out-of-band noise, go removing DC bias and baseline drift, then
Obtained data is processed further.It is specially：Because baseband signal includes I, Q two-way, then respectively two paths of signals is existed
Carry out the analysis of time-frequency domain in MATLAB, and contrasted；Using data when stablizing during analysis, every road is at 6000 points.
As shown in Fig. 2 present invention also offers a kind of vital signs based on continuous wave detects processing system, described it is based on
The vital signs of continuous wave detects processing system and includes：
Life-detection instrument 100, irradiates life entity for launching continuous wave signal, receives the echo-signal being reflected by life entity, and
Baseband signal is obtained according to launched continuous wave signal and echo-signal, specifically as described in above-mentioned embodiment of the method；
The data collecting card 200 being connected with described life-detection instrument, for obtained baseband signal is converted to data signal,
Specifically as described in above-mentioned embodiment of the method；
The computer 300 being connected with described data collecting card, is wherein exhaled for extracting after institute's conversion digital signal is filtered
Inhale signal waveform, and calculate respiratory rate, specifically as described in above-mentioned embodiment of the method.
Further, described life-detection instrument specifically includes：
Oscillator, for the continuous wave signal for 24GHz for the tranmitting frequency, specifically as described in above-mentioned embodiment of the method；
The transmitting antenna being connected with described oscillator, for the part continuous wave signal becoming transmission signal is launched, tool
Body is as described in above-mentioned embodiment of the method；
Reception antenna, for receiving the echo-signal of life entity reflection, specifically as described in above-mentioned embodiment of the method；
The I channel mixer being connected with described oscillator and reception antenna, for distributing from another part continuous wave signal
The I channel signal coming and the echo-signal mixing being received, specifically as described in above-mentioned embodiment of the method；
The Q channel mixer being connected with described oscillator and reception antenna, for distributing from another part continuous wave signal
The Q channel signal coming and the echo-signal mixing being received, specifically as described in above-mentioned embodiment of the method；
The preamplifier being connected with described I channel mixer and Q channel mixer, for respectively to I passage mixed frequency signal and Q
Passage mixed frequency signal is filtered enhanced processing to obtain I baseband signal and Q baseband, specifically as above-mentioned embodiment of the method institute
State.
Further, described data collecting card specifically for：
Respectively obtained I baseband signal and Q baseband are converted to the first data signal and the second data signal, specifically such as
Described in said method embodiment.
Further, described computer specifically includes：
High-pass filter, for respectively the first data signal and the second data signal being carried out high-pass filtering, concrete such as above-mentioned side
Described in method embodiment；
The low pass filter being connected with described high-pass filter, for respectively to the first data signal and second after high-pass filtering
Data signal carries out LPF, specifically as described in above-mentioned embodiment of the method；
The central processing unit being connected with described low pass filter, for extracting the first data signal and second after LPF respectively
Breath signal waveform in data signal, and Wave crest and wave trough inspection is carried out under LabVIEW environment to extracted breath signal waveform
Survey；And calculate instantaneous respiratory rate according to detected two adjacent crests or trough, specifically as above-mentioned embodiment of the method institute
State.
Further, described computer is additionally operable to：
Time-Frequency Analysis and contrast are carried out to the first data signal after LPF and the second data signal, concrete such as said method
Described in embodiment.
As shown in figure 3, the present invention also provides and a kind of is applied to the as above vital signs based on continuous wave described in any one
The life-detection instrument of detection processing method, described life-detection instrument includes：
Oscillator 110, for the continuous wave signal for 24GHz for the tranmitting frequency, specifically as described in above-mentioned embodiment of the method；
The transmitting antenna 120 being connected with described oscillator, for the part continuous wave signal becoming transmission signal is launched,
Specifically as described in above-mentioned embodiment of the method；
Reception antenna 130, for receiving the echo-signal of life entity reflection, specifically as described in above-mentioned embodiment of the method；
The I channel mixer 140 being connected with described oscillator and reception antenna, for shunting from another part continuous wave signal
I channel signal out and the echo-signal mixing being received, specifically as described in above-mentioned embodiment of the method；
The Q channel mixer 150 being connected with described oscillator and reception antenna, for shunting from another part continuous wave signal
Q channel signal out and the echo-signal mixing being received, specifically as described in above-mentioned embodiment of the method；
The preamplifier 160 being connected with described I channel mixer and Q channel mixer, for respectively to I passage mixed frequency signal
And Q passage mixed frequency signal is filtered enhanced processing to obtain I baseband signal and Q baseband, concrete such as said method is implemented
Example is described；
And for providing the pressure source 170 of operating voltage, specifically as described in above-mentioned embodiment of the method.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can
To be improved according to the above description or to be converted, parameter setting of for example described continuous wave radar etc., all these improvement and change
Change the protection domain that all should belong to claims of the present invention.
Claims (10)
1. a kind of vital signs detection processing method based on continuous wave is it is characterised in that the described life based on continuous wave is special
Levy detection processing method to include：
Step A：Life-detection instrument transmitting continuous wave signal irradiates life entity, receives the echo-signal being reflected by life entity, and root
Obtain baseband signal according to launched continuous wave signal and echo-signal；
Step B：Obtained baseband signal is converted to data signal by data collecting card；
Step C：Computer extracts wherein breath signal waveform after institute's conversion digital signal is filtered, and calculates respiratory rate.
2. the vital signs detection processing method based on continuous wave according to claim 1 is it is characterised in that described step
A specifically includes：
Step A1：Oscillator tranmitting frequency is the continuous wave signal of 24GHz；
Step A2：Continuous wave signal is divided into two-way, a road is transmission signal, launches by transmitting antenna；Another road is divided
Flow for I channel signal and Q channel signal, wherein, I channel signal enters I channel mixer, Q channel signal warp by I passage
After 90 ° of phase shifts, Q channel mixer is entered by Q passage；
Step A3：Reception antenna receives the echo-signal of life entity reflection；
Step A4：I channel mixer and Q channel mixer are respectively by the echo-signal being received and I channel signal and Q passage letter
Number mixing, obtain I passage mixed frequency signal and Q passage mixed frequency signal；
Step A5：Preamplifier is filtered enhanced processing to obtain to I passage mixed frequency signal and Q passage mixed frequency signal respectively
I baseband signal and Q baseband.
3. the vital signs detection processing method based on continuous wave according to claim 2 is it is characterised in that described step
B is specially：
Obtained I baseband signal and Q baseband are converted to the first data signal and the second numeral by data collecting card respectively
Signal.
4. the vital signs detection processing method based on continuous wave according to claim 3 is it is characterised in that described step
C specifically includes：
Step C1：First data signal and the second data signal are carried out high-pass filtering by high-pass filter respectively；
Step C2：Low pass filter carries out low pass filtered to the first data signal after high-pass filtering and the second data signal respectively
Ripple；
Step C3：Extract the breath signal waveform in the first data signal and the second data signal after LPF respectively, and right
Extracted breath signal waveform carries out Wave crest and wave trough detection under LabVIEW environment；
Step C4：Calculate instantaneous respiratory rate according to detected two adjacent crests or trough.
5. the vital signs detection processing method based on continuous wave according to claim 4 is it is characterised in that described be based on
The vital signs detection processing method of continuous wave also includes：
Step D：Time-Frequency Analysis and contrast are carried out to the first data signal after LPF and the second data signal.
6. a kind of vital signs based on continuous wave detects processing system it is characterised in that the described life based on continuous wave is special
Levy detection processing system to include：
Life-detection instrument, irradiates life entity for launching continuous wave signal, receives the echo-signal being reflected by life entity, and according to
Launched continuous wave signal and echo-signal obtain baseband signal；
The data collecting card being connected with described life-detection instrument, for being converted to data signal by obtained baseband signal；
The computer being connected with described data collecting card, for extracting wherein breathing letter after institute's conversion digital signal is filtered
Number waveform, and calculate respiratory rate.
7. vital signs based on continuous wave according to claim 6 detects processing system it is characterised in that described life
Survey meter specifically includes：
Oscillator, for the continuous wave signal for 24GHz for the tranmitting frequency；
The transmitting antenna being connected with described oscillator, for launching the part continuous wave signal becoming transmission signal；
Reception antenna, for receiving the echo-signal of life entity reflection；
The I channel mixer being connected with described oscillator and reception antenna, for distributing from another part continuous wave signal
The I channel signal coming and the echo-signal mixing being received；
The Q channel mixer being connected with described oscillator and reception antenna, for distributing from another part continuous wave signal
The Q channel signal coming and the echo-signal mixing being received；
The preamplifier being connected with described I channel mixer and Q channel mixer, for respectively to I passage mixed frequency signal and Q
Passage mixed frequency signal is filtered enhanced processing to obtain I baseband signal and Q baseband.
8. vital signs based on continuous wave according to claim 7 detects processing system it is characterised in that described data
Capture card specifically for：
Respectively obtained I baseband signal and Q baseband are converted to the first data signal and the second data signal.
9. vital signs based on continuous wave according to claim 8 detects processing system it is characterised in that described calculating
Machine specifically includes：
High-pass filter, for carrying out high-pass filtering by the first data signal and the second data signal respectively；
The low pass filter being connected with described high-pass filter, for respectively to the first data signal and second after high-pass filtering
Data signal carries out LPF；
The central processing unit being connected with described low pass filter, for extracting the first data signal and second after LPF respectively
Breath signal waveform in data signal, and Wave crest and wave trough inspection is carried out under LabVIEW environment to extracted breath signal waveform
Survey；And calculate instantaneous respiratory rate according to detected two adjacent crests or trough.
10. a kind of vital signs detection processing method based on continuous wave being applied to as any one of claim 6 to 9
Life-detection instrument it is characterised in that described life-detection instrument also includes：
For providing the pressure source of operating voltage.
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