CN109738885A - A kind of life detection radar system and method based on random code modulated sinusoid signal - Google Patents
A kind of life detection radar system and method based on random code modulated sinusoid signal Download PDFInfo
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Abstract
The present invention relates to a kind of life detection radar system and methods based on random code modulated sinusoid signal, including radar host computer and handheld terminal, the radar host computer includes power module, central processing unit, transmitting unit, receiving unit, transmitting antenna, receiving antenna and communication unit, life detection order is sent from the handheld terminal to radar host computer, system generates random code modulated sinusoid signal after receiving order, emitted after power amplifier amplifies by transmitting antenna, life detection is carried out to target area, the echo-signal that receiving antenna receives is demodulated after low noise amplifier amplifies by quadrature demodulator, data acquisition module is acquired the signal after demodulation, then it exports to central processing unit and carries out the extraction of life-information and location information, and it will analyze and determine that result is transmitted to handheld terminal and shows.Random code signal is introduced into traditional Doppler's life detection radar by this system, is quick on the draw, high resolution, strong antijamming capability.
Description
Technical field
The present invention relates to human body target life detection equipment fields, more particularly to a kind of random code modulated sinusoid that is based on to believe
Number life detection radar system and method, the life-information and location information of human body target can be obtained simultaneously.
Background technique
In China, the natural calamities such as earthquake, mud-rock flow happen occasionally, and how quickly to find that survivor becomes after calamity and improve
The key of search efficiency.Life-detection instrument is determined by detecting the life-informations such as heartbeat, blood pressure, body temperature, the breathing of human body
Whether there is or not the instruments of sign of life for specific regional aim.Currently there are life-detection instrument mainly include audio life visit
Survey instrument, video life detection instrument, infrared life-detection instrument, air-sensitive life-detection instrument and radar life-detector.Audio, view
Frequently, infrared, air-sensitive formula life-detection instrument is easy to be influenced by extraneous factors such as environmental noise, temperature and live visibilitys, and radar
Formula life-detection instrument is to combine Radar Technology with biomedical signals measuring technology, based on the time domain generated on radar return
Doppler effect come analyze and determine whether there is or not life entity exist and life entity more specific location information, have good barrier wear
Saturating ability and lesser clear superiority is interfered by environmental factor.Therefore life detection radar systematic research is to raising China's calamity
Rescue ability, reduction casualties etc. are of great significance afterwards.
The later period nineties in last century, CW (single-frequency continuous wave) radar that the Georgia technical research institute in the U.S. develops utilize
The phase change of single-frequency continuous wave echo-signal detects the life-information of human body target, single-frequency continuous wave radar reaction spirit
Quick, structure is simple, but can only detect the life-information of human body target and cannot obtain the position of target；The IJ of Russia
Immoreev et al. has developed UWB (ultra-wideband pulse) radar for emergency management and rescue, and ultra wide band pulsed radar utilizes echo arteries and veins
The Delay Variation for rushing signal detects the life-information and location information of human body target, has penetration capacity strong, distance point
Resolution is high, the strong advantage of clutter suppression capability, but signal processing is complex and maximum detectable range and resolution ratio it
Between there is the contradictions that can not be reconciled.2005, Turkey ILHT (International Laboratory for High
Technology) laboratory development stepped frequency continuous wave life detection radar system, stepped frequency continuous wave life detection
Radar is using stepped frequency continuous wave echo-signal and emits the difference on the frequency between signal and phase change progress human body target life
The detection for ordering information and location information, overcomes the shortcomings that Doppler radar cannot position, but the signal of stepped frequency continuous wave
Generating device is complex and the calculation amount of echo signal processing is very huge, and real-time is poor.2012, U.S.'s Bentley method
Ni Ya university Narayanan Ram.M. et al. proposes the novel life of a kind of noise based on ultra wide band and sinusoidal continuous wave
Acquisition radar system, the system control system operating mode by mode switch, using ultra wide band noise to mesh after wall
Mark is positioned, and is detected using sinusoidal continuous wave to targeted vital information, system solves the problem single-frequency continuous waves to survey
The shortcomings that obtaining target position, but hardware configuration is more complicated, and the signal amplitude of noise signal is smaller, it is difficult to it carries out remote
Life detection.
Random code signal has noise like characteristic and a stronger anti-interference ability, production method it is simple and be easy to get compared with
High-power, ambiguity function is that ideal " drawing pin type " has it without fuzzy ranging, the performance that tests the speed and good distance, speed
Spend resolution ratio.
Summary of the invention
In view of the above technical problems, the purpose of the present invention is to provide a kind of lifes based on random code modulated sinusoid signal
Acquisition radar system and method are ordered, compared to single-frequency continuous wave life detection radar, which can detect the life of human body simultaneously
Information and location information, compared to stepped frequency continuous wave life detection radar and ultra-wideband pulse life detection radar, this is
Unite signal generation apparatus and follow-up signal processing it is relatively simple, have penetration capacity strong, detection accuracy is high, strong antijamming capability with
And advantage simple to operate.
To achieve the above object, the invention adopts the following technical scheme:
A kind of life detection radar system based on random code modulated sinusoid signal comprising radar host computer and hand-held end
End, the radar host computer specifically include that power module, central processing unit, transmitting unit, receiving unit, communication unit, transmitting day
Line and receiving antenna.The handheld terminal can be used for parameter setting and send calibration command and probe instructions to radar host computer,
The communication unit is for the data transmission between radar host computer and handheld terminal, after system receives probe instructions, the hair
The sine wave signal that unit generates the modulation of nanosecond random code is penetrated, the transmitting antenna is used to believe to search coverage radiation detection
Number, the receiving antenna is used for receives echo-signal, is then transmit to central processing unit, and the central processing unit carries out clutter suppression
System, detection and analysis judgement, detection result are transmitted to handheld terminal through the communication unit and are shown.
Particularly, the transmitting unit includes signal generating module and power amplifier, and the signal generating module includes
Random code generator, continuous-wave generator, frequency mixer, the first power splitter and the second power splitter；The output of random code generator signal
End is connected with the first power splitter, and continuous-wave generator signal output end is connected with the second power splitter, and the of the first power splitter
Output end is connected with IF (intermediate frequency) input terminal of frequency mixer all the way, RF (radio frequency) output end of frequency mixer and power amplifier
Signal input part is connected, and the signal output end of power amplifier is connected with the signal input part of transmitting antenna；Second function point
The first via output end of device is connected with LO (local oscillator) input terminal of frequency mixer；The receiving unit include data acquisition module,
Quadrature demodulator and low noise amplifier；The signal output end of receiving antenna is connected with the signal input part of low-noise amplifier,
The signal output end of low-noise amplifier is connected with RF (radio frequency) input terminal of quadrature demodulator, the second tunnel of the first power splitter
Output end, quadrature demodulator two-way IF (intermediate frequency) output end be connected with the signal input part of data acquisition module, second
Second road output end of power splitter is connected with LO (local oscillator) input terminal of quadrature demodulator；Data processing module and central processing
Device carries out data communication by USB connecting line；Random code generator generates the random code signal of nanosecond by the first power splitter function point
Two-way, the first via are used for modulated sinusoid signal, the second tunnel reference signal used for positioning；Continuous-wave generator generates sine wave
Signal is divided into two-way by the second power splitter, and the first via is used for local oscillation signal, and the second tunnel is used for the demodulation of echo-signal；Frequency mixer is defeated
The sine wave signal of random code modulation detects target area after power amplifier amplification out；The low noise amplification
Then device carries out quadrature demodulation by the quadrature demodulator for amplifying the received echo-signal of receiving antenna.
Particularly, when radar host computer carries out life detection, the data acquisition module is automatically right under different acquisition parameter
Intermediate-freuqncy signal acquisition after demodulation is respectively used to the extraction of life-information and the extraction of location information twice.
Particularly, the central processing unit can be communicated with data acquisition module, receive data collecting module collected
Intermediate-freuqncy signal carry out clutter recognition, detection and analysis judgement, while the acquisition parameter of data acquisition module can be controlled, can
It is communicated by communication unit with the handheld terminal, receives the calibration or probe instructions of its transmission, and can be by detection result
Handheld terminal is fed back, is shown by handheld terminal.
Particularly, the communication unit is WiFi unit.
The invention also discloses a kind of spies of the life of life detection radar system based on random code modulated sinusoid signal
Survey method, described method includes following steps:
S1, system switching is opened, handheld terminal is configured system parameter, and transmitting unit is generated through nanosecond random code
The sine wave signal of modulation is simultaneously radiated from transmitting antenna to target area；
S2, receiving antenna receive echo-signal；
S3, handheld terminal transmitting calibration instruct, and the central processing unit in radar host computer receives calibration by communication unit
The factor of the interference detections result such as system delay test and store result by specified path after instruction；
S4, handheld terminal emission detection instruct, and the central processing unit in radar host computer receives detection by communication unit
After instruction, control data collecting card acquires the echo-signal after demodulation under different acquisition parameter twice；
S5, central processing unit carry out clutter recognition to acquisition signal simultaneously by specified path calling calibration result, and detection divides
Analysis and judgement；
Detection result is transmitted to handheld terminal by communication unit and shown by S6, central processing unit.
Particularly, the step S1 to S6 is specifically included: after system switching is opened, the signal generating module generates 3 tunnels
Signal, comprising: the sine wave signal modulated all the way through nanosecond random code, it is random for the nanosecond of location reference signals all the way
Code signal, the sinusoidal signal for echo-signal demodulation, the sine wave signal modulated through nanosecond random code are put by power all the way
Emitted as detectable signal by transmitting antenna after big device amplification, echo-signal enters receiving unit by receiving antenna；Hand
It holds terminal and is instructed by communication unit to radar host computer transmitting calibration, after central processing unit controls data acquisition module to demodulation
Echo-signal is acquired and handles, and the results such as the system delay of test are stored by specified path；Handheld terminal is logical
It crosses communication unit to instruct to radar host computer emission detection, central processing unit controls data acquisition module respectively in different acquisition parameter
Under the echo-signal after demodulation is acquired twice automatically, be respectively used to the extraction of life-information and location information.
Particularly, the detectable signal of the radar host computer transmitting is the sine wave signal modulated based on random code, detection letter
Number it is irradiated to human body target back reflection, is received by the receiving antenna and enter receiving unit and handled, central processing unit utilizes
Doppler principle combination related positioning method extracts human life information and location information.
Particularly, the handheld terminal setting system parameter or transmitting calibration and probe instructions specifically include: handheld terminal
It include parameter setting and region as the result is shown in operation interface, handheld terminal can be by communication unit to radar host computer emission parameter
Setting instruction, calibration command and probe instructions can receive detection result and the display of radar host computer by communication unit.
Particularly, the communication unit is WiFi unit.
Beneficial effects of the present invention are a kind of life detection radar system based on random code modulated sinusoid signal
And method, use random code modulated sinusoid signal as detectable signal, compared to single-frequency continuous wave life detection radar,
The life-information and location information of human body can be detected simultaneously；Compared to stepped frequency continuous wave life detection radar and ultra-short pulse
Life detection radar is rushed, the system signal generating device and follow-up signal processing are relatively simple.It is strong with penetration capacity, detection essence
Degree is high, strong antijamming capability, distance resolution high (up to Centimeter Level) and advantage simple to operate.
Detailed description of the invention
The structural schematic diagram of life detection radar of the Fig. 1 based on random code modulated sinusoid signal；
The flow chart of life detection radar system detection method of the Fig. 2 based on random code modulated sinusoid signal.
1- radar host computer, 2- power module, 3- random code generator, 4- continuous wave signnal generator, the first power splitter of 5-,
The second power splitter of 6-, 7- frequency mixer, 8- signal generating module, 9- power amplifier, 10- transmitting antenna, 11- central processing unit,
12- data acquisition module, 13- quadrature demodulator, 14- low noise amplifier, 15- receiving antenna, 16- communication unit, 17- are hand-held eventually
End, 18- transmitting unit, 19- receiving unit.
Specific embodiment
Life detection radar system and method based on random code modulated sinusoid signal has stronger electromagnetism interference
Therefore ability and clutter suppression capability are carrying out in the complex environment in use, advantageously ensure that system detection result can
By property, in addition, the detectable signal in the life detection radar system and method based on random code modulated sinusoid signal generates original
It manages relatively simple.
Present invention will be further explained below with reference to the attached drawings and examples.It please refers to shown in Fig. 1, Fig. 1 is base of the present invention
In the structural schematic diagram of the life detection radar of random code modulated sinusoid signal.
In the present embodiment, a kind of ultra wide band radar life detection system, including radar host computer 1 and handheld terminal 17, institute
Radar host computer 1 is stated to include power module 2, central processing unit 11, transmitting unit 18, receiving unit 19, transmitting antenna 10, receive day
Line 15 and communication unit 16 (using WiFi unit), the transmitting unit 18 includes signal generating module 8 and power amplifier 9,
Wherein signal generating module 8 includes random code generator 3, continuous wave signnal generator 4, the first power splitter 5, the second power splitter 6
And frequency mixer 7, the receiving unit 19 include data acquisition module 12, quadrature demodulator 13 and low noise amplifier 14, the electricity
Source module 2 is random code generator 3, continuous wave signnal generator 4, quadrature demodulator 13, power amplifier 9 and low noise
Big device 14 is powered, and after system power supply, transmitting unit 18 generates the sine wave signal modulated by nanosecond random code through power amplification
Device 9 is radiated after amplifying from transmitting antenna 10 to target area, and the handheld terminal 17 is instructed to 1 emission detection of radar host computer, is visited
It surveys instruction and enters central processing unit 11 through communication unit 16, the received antenna 15 of echo-signal enters receiving unit 19, to echo
Enter central processing unit 11 after being handled and carry out clutter recognition, detection and analysis judgement, and will be handled by communication unit 16
As a result handheld terminal 17 is transmitted to be shown.
Groundwork process of the present invention:
(1) radar host computer 1 and handheld terminal 17 are switched on, and handheld terminal 17 enters operation interface, and transmitting unit 18 generates spy
Signal is surveyed to be radiated from transmitting antenna 10 to target area.
(2) calibration knob in 17 software interface of handheld terminal is clicked, school is sent to radar host computer 1 by communication unit 16
Quasi instruction, system are calibrated.
(3) the detection button in 17 software interface of handheld terminal is clicked, is sent and is visited to radar host computer 1 by communication unit 16
Survey instruction.
(4) the received antenna 15 of echo-signal enters receiving unit 19 by processing, and central processing unit 11 controls data and adopts
Collection module twice and is transmitted to central processing unit and carries out life-information respectively under different sample rates to signal automatic acquisition respectively
It is extracted with location information, detection result is transmitted to handheld terminal 17 by communication unit 16 and is shown.Separate run times are big
About need 40 seconds.
(5) as needed, selection continues to detect next time, or exits software, terminates detection.
(6) handheld terminal 17 and radar host computer 1 shut down.
Shown in referring to figure 2., Fig. 2 is that the present invention is based on the spies of the life detection radar system of random code modulated sinusoid signal
The flow chart of survey method；
In the present embodiment, a kind of life detection radar system life detection side based on random code modulated sinusoid signal
Method, the method are as follows:
A kind of life detection radar system and method based on random code modulated sinusoid signal is used through random code
For the sine wave signal of modulation as detectable signal, generating device is relatively simple, can measure the life letter of human body target simultaneously
Breath and location information, can be realized Centimeter Level distance resolution, and anti-electromagnetic interference capability is stronger, can be in complex environment
The reliability of guarantee system.Random code generator generates the random code signal of nanosecond and divides two-way by the first power splitter function, uses all the way
It in the reference signal of positioning, is sampled by data acquisition module, another way is used for modulated sinusoid signal；Continuous-wave generator
It generates sine wave signal and divides two-way by the second power splitter function, be used for local oscillation signal all the way, another way is used for the demodulation of echo-signal.
Since respiratory rate and random code signal rate differ greatly, obtains one section of complete breath signal and need 20 seconds or so, therefore,
Data acquisition module under different sampling parameters automatically to the signal acquisition after demodulation twice, be respectively used to extract human body target
Life-information and location information.
Life detection radar system life detection method based on random code modulated sinusoid signal mainly utilizes Doppler
Principle combination located in connection algorithm realizes the detection of human body target life-information and location information, in conjunction with formula, to detection method
It illustrates:
Random code-Doppler's life detection radar system transmitting signal is the sinusoidal signal modulated through random code, can table
It is shown as TR+S(t), since a part of sinusoidal signal is leaked to mixer output, transmitting signal be may be expressed as:
TR+S(t)=TR(t)×TS(t)+TS(t)
Wherein TRIt (t) is random code signal, TSIt (t) is sinusoidal continuous wave signal.
The radar system mainly detects vital sign using the continuous wave component in detectable signal, when the detection of radar is believed
When number being irradiated to human body, according to doppler principle, the cycle movement of torso model can generate narrowband phase modulation effect to detectable signal
It answers, so as to obtain the life-information of target in echo-signal.Continuous wave component in radar detection signal may be expressed as:
Wherein AT, f is respectively the amplitude and frequency of sinusoidal continuous wave signal；For sinusoidal continuous wave signal when it is covert
Position noise.
Human body changes over time at a distance from radar antenna, is expressed as d (t)=d0+ x (t), d0For human body target and antenna
Between symbol distance, x (t) be torso model cycle movement generate displacement, be approximately x (t) ≈ ALsin(2πfLT),
Middle AL, fLThe respectively amplitude and frequency of life signal.Due to the delay of signal two-way time, the echo-signal of sine wave can table
It is shown as:
ARTo receive signal amplitude, θ0For phase shift caused by other factors, tdFor the trip time delay of signal, can indicate
For
Therefore, the echo-signal of sine wave is represented by
Wherein, λ is sine wave signal wavelength.
As it can be seen that the fine motion x (t) of torso model is to echo-signal RS(t) phase produces modulation.Thoracic cavity in order to obtain
Fine motion information carries out the echo-signal of sine wave with local oscillation signal to be mixed demodulation, and the baseband signal after demodulation passes through low pass filtered
It can be expressed as follows after wave:
Wherein, ARBFor the amplitude of baseband signal, phase shift constantResidual noise
Baseband signal after low-pass filtering is subjected to direct current and Fourier transformation processing, obtains the frequency of baseband signal
Afterwards, it is compared with general human body respiratory rate (0.1Hz-0.5Hz), if having after disturbance in judgement object in this frequency range
Human body target exists；Otherwise, judge no human body target.
Measurement for target position, if the speed propagated in air of electromagnetic wave is v, then the location information of target can be by
Formula v*td/ 2 are calculated.The key of target positioning is to obtain the two-way time t of signald.As detectable signal all the way with
It is received round-trip by being emitted to that machine code signal generates time delay, that is, signal relative to another way random code reference signal after propagating
Time.Due to the correlation properties of random code, random code echo-signal Rech-I(tf),Rech-Q(tf) and random code reference signal Rref
(tf) time series correlation curve have δ line style, and peak value both time delay present in.Therefore tdIt can be by following public affairs
Formula obtains:
WhereinIt indicates to carry out related operation.
Random code signal is introduced into traditional Doppler's life detection radar by this system, and system structure and signal extraction are calculated
Method is simple, can be achieved at the same time life detection and positioning function, has and is quick on the draw, high resolution and strong antijamming capability
Advantage.
The above is only a better embodiment of the present invention and the applied technical principle, any technology people for being familiar with the art
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, should all cover in protection scope of the present invention by member
It is interior.
Claims (10)
1. a kind of life detection radar system based on random code modulated sinusoid signal, it is characterised in that the system comprises thunders
Up to host (1) and handheld terminal (17)；The radar host computer (1) includes: power module (2), central processing unit (11), transmitting list
First (18), receiving unit (19), communication unit (16), transmitting antenna (10) and receiving antenna (15)；The handheld terminal (17)
Calibration command and probe instructions are sent for parameter setting and to radar host computer (1), is referred to when radar host computer (1) receives calibration
When enabling, Time Delay of Systems and environmental disturbances factor are tested, prepared for life detection；When radar host computer (1) receives spy
When surveying instruction, echo-signal enters receiving unit (19) by receiving antenna (15) and amplifies demodulation process, is then input to
Central processor (11) carries out clutter recognition, detection and analysis judgement, and detection result is transmitted to hand-held through the communication unit (16)
Terminal (17) is shown.
2. the life detection radar system according to claim 1 based on random code modulated sinusoid signal, feature exist
In the transmitting unit (18) includes signal generating module (8) and power amplifier (9), and the signal generating module (8) includes
Random code generator (3), continuous-wave generator (4), frequency mixer (7), the first power splitter (5) and the second power splitter (6)；Random code
Generator (3) signal output end is connected with the first power splitter (5), continuous-wave generator (4) signal output end and the second function point
Device (6) is connected, and the first via output end of the first power splitter (5) is connected with the IF input terminal of frequency mixer (7), frequency mixer (7)
RF output end be connected with the signal input part of power amplifier (9), the signal output end of power amplifier (9) and transmitting day
The signal input part of line (10) is connected；The first via output end of second power splitter (6) is connected with the LO input terminal of frequency mixer (7)
It connects；The receiving unit (19) includes data acquisition module (12), quadrature demodulator (13) and low noise amplifier (14)；Receive day
The signal output end of line (15) is connected with the signal input part of low-noise amplifier (14), the signal of low-noise amplifier (14)
Output end is connected with the RF input terminal of quadrature demodulator (13), the second road output end, the quadrature demodulator of the first power splitter (5)
(13) two-way IF output end is connected with the signal input part of data acquisition module (12), and the second of the second power splitter (6)
Road output end is connected with the end LO of quadrature demodulator (13)；Data processing module (12) and central processing unit (11) pass through USB
Connecting line carries out data communication；Random code generator (3) generates the random code signal of nanosecond and is divided to two by the first power splitter (5) function
Road, the first via are used for modulated sinusoid signal, the second tunnel reference signal used for positioning；Continuous-wave generator (4) generates sinusoidal
Wave signal divides two-way by the second power splitter (6) function, and the first via is used for local oscillation signal, and the second tunnel is used for the demodulation of echo-signal；It is mixed
The sine wave signal of frequency device (7) output random code modulation detects target area after the power amplifier (9) amplification；
The low noise amplifier (14) is for amplifying receiving antenna (15) received echo-signal, then by the quadrature demodulator (13)
Carry out quadrature demodulation.
3. the life detection radar system according to claim 2 based on random code modulated sinusoid signal, feature exist
In when radar host computer (1) carries out life detection, after the data acquisition module (12) is automatically under different acquisition parameter to demodulation
Intermediate-freuqncy signal acquisition twice, be respectively used to the extraction of life-information and the extraction of location information.
4. the life detection radar system according to claim 2 or 3 based on random code modulated sinusoid signal, feature
It is, the central processing unit (11) can be communicated with data acquisition module (12), received data acquisition module (12) and adopted
The intermediate-freuqncy signal of collection carries out clutter recognition, detection and analysis judgement, while can control the acquisition ginseng of data acquisition module (12)
Number, can be communicated by communication unit (16) with the handheld terminal (17), the calibration or probe instructions of its transmission are received,
And detection result can be fed back to handheld terminal (17), it is shown by handheld terminal.
5. described in any item a kind of life detection radar systems based on random code modulated sinusoid signal according to claim 1 ~ 3
System, which is characterized in that the communication unit (16) is WiFi unit.
6. a kind of life detection method based on random code modulated sinusoid signal life detection radar, which is characterized in that including
Following steps:
S1, open system switching, handheld terminal (17) is configured system parameter, transmitting unit (18) generate through nanosecond with
The sine wave signal of machine code modulation is radiated from transmitting antenna (10) to target area；
S2, receiving antenna (15) receive echo-signal；
S3, handheld terminal (17) transmitting calibration instruct, and the central processing unit (11) in radar host computer (1) passes through communication unit (16)
Receive after calibration command to the factor of the such interference detection result of system delay carry out test and by result by specified path into
Row storage；
S4, handheld terminal (17) emission detection instruct, and the central processing unit (11) in radar host computer (1) passes through communication unit (16)
After receiving probe instructions, controls data acquisition module (12) and two are carried out to the echo-signal after demodulation under different acquisition parameter
Secondary acquisition；
S5, central processing unit (11) carry out clutter recognition to acquisition signal simultaneously by specified path calling calibration result, and detection divides
Analysis and judgement；
Detection result is transmitted to handheld terminal (17) by communication unit (16) and shown by S6, central processing unit (11).
7. the life detection side based on random code modulated sinusoid signal life detection radar according to claim 6
Method, which is characterized in that the step S1 to S6 is specifically included: after system switching is opened, the signal generating module (8) is produced
Raw 3 road signals, comprising: the sine wave signal modulated all the way through nanosecond random code is used for the nanosecond of location reference signals all the way
The random code signal of grade, the sinusoidal signal for echo-signal demodulation all the way, the sine wave signal modulated through nanosecond random code by
Emitted as detectable signal by transmitting antenna (10) after power amplifier (9) amplification, echo-signal passes through receiving antenna
(15) enter receiving unit (19)；Handheld terminal (17) is instructed by communication unit (16) to radar host computer (1) transmitting calibration, in
Central processor (11) control data acquisition module (12) to the echo-signal after demodulation is acquired and handles, and by test as
The result of system delay is stored by specified path；Handheld terminal (17) is sent out by communication unit (16) to radar host computer (1)
Probe instructions are penetrated, central processing unit (11) controls data acquisition module (12) respectively under different acquisition parameter to returning after demodulation
Wave signal is acquired twice automatically, is respectively used to the extraction of life-information and location information.
8. the life detection side according to claim 6 or 7 based on random code modulated sinusoid signal life detection radar
Method, which is characterized in that the detectable signal of radar host computer (1) transmitting is the sine wave signal modulated based on random code, detection
Signal is irradiated to human body target back reflection, is received by the receiving antenna (15) into receiving unit (19) and is handled, center
Processor (11) extracts human life information and location information using doppler principle combination related positioning method.
9. the life detection side according to claim 6 or 7 based on random code modulated sinusoid signal life detection radar
Method, which is characterized in that handheld terminal (17) the setting system parameter or transmitting calibration and probe instructions specifically include: hand-held whole
In the operation interface of end include parameter setting and region, handheld terminal can emit ginseng to radar host computer by communication unit as the result is shown
Number setting instruction, calibration command and probe instructions can receive detection result and the display of radar host computer by communication unit.
10. the life detection side according to claim 6 or 7 based on random code modulated sinusoid signal life detection radar
Method, which is characterized in that the communication unit (16) is WiFi unit.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112526501A (en) * | 2019-09-19 | 2021-03-19 | 苏州豪米波技术有限公司 | Radar system for detecting life breath |
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