CN115120208A - Human body sensing information transmission and human body behavior detection system and method - Google Patents

Human body sensing information transmission and human body behavior detection system and method Download PDF

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Publication number
CN115120208A
CN115120208A CN202210564426.4A CN202210564426A CN115120208A CN 115120208 A CN115120208 A CN 115120208A CN 202210564426 A CN202210564426 A CN 202210564426A CN 115120208 A CN115120208 A CN 115120208A
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signal
sensing
circuit
human body
low
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皇甫江涛
黄琳睿
马恒坚
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
    • A61B5/02055—Simultaneously evaluating both cardiovascular condition and temperature
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/02141—Details of apparatus construction, e.g. pump units or housings therefor, cuff pressurising systems, arrangements of fluid conduits or circuits
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A61B5/1118—Determining activity level
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A61B5/1126—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb using a particular sensing technique
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/25—Bioelectric electrodes therefor
    • A61B5/251—Means for maintaining electrode contact with the body
    • A61B5/256—Wearable electrodes, e.g. having straps or bands
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7235—Details of waveform analysis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7235—Details of waveform analysis
    • A61B5/725—Details of waveform analysis using specific filters therefor, e.g. Kalman or adaptive filters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/20—Clinical contact thermometers for use with humans or animals

Abstract

The invention discloses a human body sensing information transmission and human body behavior detection system and a method. The system comprises: the human body sign sensing terminal is electrically connected with the sensing detection device through a flexible microstrip transmission line; the low-pass reflection device is electrically connected with the sensing terminal device; the low-pass coupling device is respectively and electrically connected with the sensing information collecting circuit and the radio frequency signal detection circuit; the low-pass coupling device and the low-pass reflecting device are electrically connected through a flexible microstrip transmission line; the method comprises the following steps: transmitting a control signal and a detection signal; the control signal controls the sensing terminal device to collect the sensing signal of the human body, and the detection signal returns to the reflection signal; converting the sensing signals to obtain sensing information; the reflection signal is compared with the reference signal to obtain a reflection coefficient; and obtaining the input impedance of the circuit, comparing the input impedance with a preset action change index, and obtaining the action change of the human body under the condition of the current sensing information. The system and the method are based on the wearable flexible circuit, can be used for motion monitoring and the like, and have good application value.

Description

Human body sensing information transmission and human body behavior detection system and method
Technical Field
The invention relates to a human body behavior detection system, in particular to a distributed human body sensing information transmission and human body behavior detection system and method based on a wearable flexible radio frequency circuit.
Background
Wearable technology is a technology for exploring a smart electronic device to be worn on the body or integrated with clothes, accessories, and the like, and typical products are smart bracelets, activity trackers, and the like. Wearable technology can be used to monitor that the user is healthy, collects information such as user's rhythm of the heart, blood pressure, step number through the sensor and carries out the integrated analysis to provide health guidance for the user. The wearable devices in the market usually focus on collecting and analyzing human body sensing information, and have less development or limited recognizable actions for human body behavior detection functions, and less devices combining the two functions.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a human body sensing information transmission and human body behavior detection system and method, provides a method and system for combining human body sensing information transmission and human body behavior detection, has low cost and can realize more functions, and is a new method applied to wearable scenes.
The technical scheme adopted by the invention is as follows:
a human body sensing information transmission and human body behavior detection system comprises:
the human body sensing information transmission and human body behavior detection system comprises a flexible microstrip transmission line, a human body sign sensing terminal and a sensing detection device, wherein the human body sign sensing terminal and the sensing detection device are electrically connected through the flexible microstrip transmission line.
The human body sign sensing terminal comprises a low-pass reflecting device and a sensing terminal device, and the low-pass reflecting device is electrically connected with the sensing terminal device; the sensing detection device comprises a low-pass coupling device, a sensing information collection circuit and a radio frequency signal detection circuit, wherein the low-pass coupling device is electrically connected with the sensing information collection circuit and the radio frequency signal detection circuit respectively.
The low-pass coupling device and the low-pass reflection device are electrically connected through a flexible microstrip transmission line.
The low-pass reflection device of the human body sign sensing terminal comprises a first low-pass filter and a radio frequency reflector, a flexible microstrip transmission line is electrically connected with one end of the low-pass reflection device to lead out two-pole lines and is respectively and electrically connected with the first low-pass filter and the radio frequency reflector, the first low-pass filter is electrically connected with the radio frequency reflector, and the first low-pass filter is electrically connected with the sensing terminal device;
the low-pass coupling device of the sensing detection device comprises a second low-pass filter and a directional coupler, and the flexible microstrip transmission line is electrically connected with the other end of the low-pass coupling device to lead out two-pole lines and is respectively and electrically connected with the coupling ends of the second low-pass filter and the directional coupler; the second low-pass filter is respectively and electrically connected with the sensing information collecting circuit and the input end of the directional coupler, the input end of the directional coupler is simultaneously and electrically connected with the sensing information collecting circuit and the radio-frequency signal detection circuit, and the output end of the directional coupler is electrically connected with the radio-frequency signal detection circuit.
The radio frequency signal detection circuit comprises a signal source, a power divider, a comparison circuit and a behavior detector, wherein the signal source is electrically connected with the input end of the power divider, the output end of the power divider is respectively electrically connected with the input end of the directional coupler and the comparison circuit, and the output end of the directional coupler is sequentially electrically connected with the comparison circuit and the behavior detector.
The radio frequency signal detection circuit has the functions of sending radio frequency signals and analyzing reflected radio frequency signals, and can analyze S parameters of the signals by adopting a vector network analysis circuit and the like.
The flexible microstrip transmission line is specifically a microstrip line, a differential line or a coplanar waveguide and the like.
Human sign sensing terminal mainly include temperature sensor, blood pressure sensor, pulse sensor and bio-electricity sensor etc. when human sign sensing terminal is connected to one of them utmost point circuit electricity of sensing detection device's one end to flexible microstrip transmission line, specifically for after leading out a plurality of utmost point circuit with this utmost point circuit, respectively electricity connect temperature sensor, blood pressure sensor, pulse sensor and bio-electricity sensor etc..
The sensing information collecting circuit transmits a control signal to the input end of the directional coupler, the radio frequency signal detecting circuit transmits a radio frequency signal through a signal source, the radio frequency signal is transmitted to the power distributor for processing and then divided into two paths of signals, one path of signal is transmitted to the comparison circuit to serve as a reference signal, the other path of signal serves as a detection signal and is transmitted to the input end of the directional coupler, the directional coupler couples the control signal and the detection signal and then outputs the coupling end of the directional coupler, and the control signal and the detection signal are further transmitted to the human body sign sensing terminal through the flexible microstrip transmission line.
The coupled control signal and detection signal are transmitted to a first low-pass filter of a low-pass reflection device of a human body sign sensing terminal, the control signal and the detection signal are separated into the control signal and the detection signal through low-pass filtering processing of the first low-pass filter, the control signal is input into the sensing terminal device from the first low-pass filter, the control signal controls the sensing terminal device to acquire human body signs to obtain the sensing signal of the human body, and the sensing terminal device transmits the sensing signal to the first low-pass filter and outputs the sensing signal; the detection signal is output to the radio frequency reflector from the first low-pass filter, and the detection signal is directly returned to be a reflection signal; the reflected signal and the sensing signal are jointly transmitted to a second low-pass filter of a low-pass coupling device of the sensing detection device through a flexible microstrip transmission line, low-pass filtering processing is carried out through the second low-pass filter and the reflected signal and the sensing signal are separated into the reflected signal and the sensing signal, and the reflected signal is output to the input end of the directional coupler from the second low-pass filter and is output to the comparison circuit from the output end of the directional coupler; the sensing signal is output from the second low-pass filter to the sensing information collection circuit.
Before the reflection signal and the sensing signal are transmitted together through the flexible microstrip transmission line, the reflection signal and the sensing signal can be input into a preset coupler for coupling, then output and transmitted together through the flexible microstrip transmission line.
The sensing information collecting circuit converts the sensing signals to obtain sensing information and collects the sensing information, wherein the sensing information mainly comprises information of human body temperature, blood pressure, pulse, bioelectricity and the like and is used for reflecting the physical sign state of the human body.
The comparison circuit compares the reflected signal with the reference signal to obtain the reflection coefficient of the reflected signal, and simultaneously obtains information such as the phase difference between the reflected signal and the reference signal; the radio frequency signal detection circuit obtains the circuit input impedance of the radio frequency signal detection circuit, and finally the circuit input impedance of the radio frequency signal detection circuit, the reflection coefficient, the phase difference and the like of the reflection signal are compared with preset action change indexes to detect the action of the human body, so that the action change of the human body under the condition of current sensing information is obtained.
The frequency bands of the sensing signals and the control signals are low-frequency carrier frequency bands; the frequency bands of the reflected signal and the detection signal are high-frequency carrier frequency bands.
The preset action change index is specifically circuit input impedance and reflection coefficient of a reflected signal of the radio frequency signal detection circuit corresponding to a plurality of action changes, and the corresponding action changes are obtained by referring to the circuit input impedance and the reflection coefficient in the preset action change index according to the circuit input impedance and the reflection coefficient obtained through system detection.
Secondly, a human body sensing information transmission and human body behavior detection method:
the human body sensing information transmission and human body behavior detection method comprises the following steps:
the method comprises the following steps: the human body physical sign sensing terminal is worn on the surface of human skin such as a wrist, the flexible microstrip transmission line is attached to the surface of the human skin or embedded into human clothes, and the sensing detection device is arranged outside a human body.
Step two: the sensing information collection circuit transmits a control signal to the directional coupler, the radio frequency signal detection circuit transmits a radio frequency signal through a signal source, the radio frequency signal is transmitted to the power distributor for processing and then divided into two paths of signals, one path of signal is transmitted to the comparison circuit to serve as a reference signal, the other path of signal is transmitted to the directional coupler as a detection signal, the directional coupler couples the control signal and the detection signal and then outputs a coupling end of the directional coupler, and the control signal and the detection signal are further transmitted to the human body physical sign sensing terminal through the flexible microstrip transmission line.
Step three: the coupled control signal and detection signal are transmitted to a first low-pass filter of a low-pass reflection device of a human body sign sensing terminal, the control signal and the detection signal are separated into the control signal and the detection signal through low-pass filtering processing of the first low-pass filter, the control signal is input into the sensing terminal device from the first low-pass filter, the control signal controls the sensing terminal device to acquire human body signs to acquire the sensing signal of the human body, and the sensing terminal device transmits the sensing signal to the first low-pass filter and outputs the sensing signal; the detection signal is output from the first low-pass filter to the radio frequency reflector, and the detection signal is directly returned to be a reflection signal.
Step four: the reflected signal and the sensing signal are jointly transmitted to a second low-pass filter of a low-pass coupling device of the sensing detection device through a flexible microstrip transmission line, low-pass filtering processing is carried out through the second low-pass filter and the reflected signal and the sensing signal are separated into the reflected signal and the sensing signal, and the reflected signal is output to the input end of the directional coupler from the second low-pass filter and is output to the comparison circuit from the output end of the directional coupler; the sensing signal is output from the second low-pass filter to the sensing information collection circuit.
Step five: the sensing information collecting circuit converts the sensing signals to obtain sensing information and collects the sensing information.
The comparison circuit compares the reflected signal with the reference signal to obtain the reflection coefficient of the reflected signal, and simultaneously obtains information such as the phase difference between the reflected signal and the reference signal; the radio frequency signal detection circuit obtains the input impedance of the circuit.
Step six: the human body behavior is detected by comparing the circuit input impedance of the radio frequency signal detection circuit, the reflection coefficient, the phase difference and the like of the reflection signal with preset action change indexes, and the action change of the human body under the condition of current sensing information is obtained.
And in the second step, the sensing information collecting circuit transmits a control signal to the directional coupler, the sensing information collecting circuit specifically transmits control information, and the control information is converted into a control signal in the sensing information collecting circuit after being subjected to analog-to-digital conversion, signal amplification and low-pass filtering in sequence and then is transmitted to the directional coupler.
In the third step, the sensing terminal device of the human body sign sensing terminal mainly comprises a baseband circuit, an analog circuit and a sensing terminal; the low-pass filter is electrically connected with the analog circuit, the baseband circuit and the sensing terminal in sequence.
The control signal is transmitted to the analog circuit and the baseband circuit in sequence, the control signal is converted into control information after being subjected to band-pass filtering and signal amplification processing of the analog circuit in sequence and the down-conversion demodulation processing of the baseband circuit, the control information controls the sensing terminal of the human body sign sensing terminal to obtain the sensing information of the human body, then the sensing information is transmitted to the baseband circuit and the analog circuit in sequence, the sensing information is subjected to analog-to-digital conversion, digital-to-analog conversion and up-conversion modulation processing of the baseband circuit, and the sensing signal of the human body is transmitted to the low-pass filter after being subjected to signal amplification and band-pass filtering processing of the analog circuit and finally converted into the sensing signal of the human body.
In the fifth step, the sensing information collecting circuit converts the sensing signals to obtain the sensing information, specifically, the sensing information collecting circuit sequentially performs signal amplification and digital-to-analog conversion on the sensing signals to obtain the sensing information.
The reflected signal is compared with a reference signal on the comparison circuit to obtain the reflection coefficient of the reflected signal, and the radio frequency signal detection circuit obtains the circuit input impedance of the radio frequency signal detection circuit.
When a human body acts or touches the flexible microstrip transmission line to cause the flexible microstrip transmission line to bend or be pressed, equivalent capacitance and inductance in a circuit are changed, so that the microstrip impedance Z of the flexible microstrip transmission line ln Changes to cause the circuit input impedance Z of the RF signal detection circuit in (l) Is not equal to the characteristic impedance Z of the radio frequency signal detection circuit 0 Input impedance Z of the circuit for detecting radio frequency signals in (l) The method comprises the following specific steps:
Figure BDA0003657269000000051
wherein l is the length of the flexible microstrip transmission line, Z in (l) The circuit input impedance of the radio frequency signal detection circuit is electrically connected with a flexible microstrip transmission line with the length l n The length of the obtained impedance transmission line is obtained by taking the flexible microstrip transmission line between the bending position of the flexible microstrip transmission line bending or the pressed position pressed and the radio frequency signal detection circuit as the impedance transmission line,
Figure BDA0003657269000000052
the length of the flexible microstrip transmission line is l when the flexible microstrip transmission line is bent or pressed n Impedance transmission line of (2); j is a complex number and β is a phase shift constant; z 0 Detecting a characteristic impedance of the circuit for the radio frequency signal;
the reflection coefficient Γ (l) of the reflection signal is obtained after the reflection signal is compared with the reference signal on the comparison circuit, which is specifically as follows:
Figure BDA0003657269000000053
wherein, Γ (l) is the reflection coefficient of the radio frequency signal detection circuit of the flexible microstrip transmission line electrically connected with length l; for different behaviors and touch behaviors of the human body, the reflection coefficients of the reflection signals are different, and the corresponding human body behaviors can be judged according to the change rule and the difference between the reflection signals and the reference signals.
The invention has the beneficial effects that:
the system and the method are based on a wearable flexible radio frequency circuit, can be used for motion monitoring and the like, simultaneously realize the transmission function of human body sensing information and the detection function of human body behaviors, and have good application value.
Drawings
FIG. 1 is a diagram illustrating the overall structure of the system of the present invention;
FIG. 2 is a schematic signal transmission diagram of the system of the present invention;
FIG. 3 is a structural diagram of the human body sign sensing terminal of the present invention;
FIG. 4 is a block diagram of the sensing information collection circuit and the RF signal detection circuit of the present invention;
in the figure: 1. the device comprises a flexible micro-strip transmission line, 2 a human body sign sensing terminal, 3 a sensing information collection circuit, 4 a radio frequency signal detection circuit, 5 a low-frequency carrier frequency band, 6 a high-frequency carrier frequency band, 7 a baseband circuit, 8 and an analog circuit.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in fig. 1 and fig. 2, the human body sensing information transmission and human body behavior detection system of the present invention includes a flexible microstrip transmission line 1, a human body sign sensing terminal 2 and a sensing detection device, wherein the human body sign sensing terminal 2 and the sensing detection device are electrically connected through the flexible microstrip transmission line 1.
The human body sign sensing terminal 2 comprises a low-pass reflecting device and a sensing terminal device, and the low-pass reflecting device is electrically connected with the sensing terminal device; the sensing detection device comprises a low-pass coupling device, a sensing information collection circuit 3 and a radio frequency signal detection circuit 4, wherein the low-pass coupling device is electrically connected with the sensing information collection circuit 3 and the radio frequency signal detection circuit 4 respectively; the low-pass coupling means and the low-pass reflecting means are electrically connected by a flexible microstrip transmission line 1.
The low-pass reflection device of the human body sign sensing terminal 2 comprises a first low-pass filter and a radio frequency reflector, a flexible microstrip transmission line 1 is electrically connected with one end of the low-pass reflection device to lead out two-pole lines and is respectively and electrically connected with the first low-pass filter and the radio frequency reflector, the first low-pass filter is electrically connected with the radio frequency reflector, and the first low-pass filter is electrically connected with the sensing terminal device;
the low-pass coupling device of the sensing detection device comprises a second low-pass filter and a directional coupler, and the flexible microstrip transmission line 1 is electrically connected with the other end of the low-pass coupling device to lead out two-pole lines and is respectively and electrically connected with the coupling ends of the second low-pass filter and the directional coupler; the second low-pass filter is respectively and electrically connected with the sensing information collecting circuit 3 and the input end of the directional coupler, the input end of the directional coupler is simultaneously and electrically connected with the sensing information collecting circuit 3 and the radio-frequency signal detecting circuit 4, and the output end of the directional coupler is electrically connected with the radio-frequency signal detecting circuit 4.
The radio frequency signal detection circuit 4 comprises a signal source, a power divider, a comparison circuit and a behavior detector, wherein the signal source is electrically connected with the input end of the power divider, the output end of the power divider is respectively electrically connected with the input end of the directional coupler and the comparison circuit, and the output end of the directional coupler is sequentially electrically connected with the comparison circuit and the behavior detector. The radio frequency signal detection circuit 4 has a function of transmitting a radio frequency signal and a function of analyzing a reflected radio frequency signal, and can analyze S parameters and the like of the signal by using a vector network analysis circuit and the like.
The flexible microstrip transmission line 1 is specifically a microstrip line, a differential line or a coplanar waveguide, etc. Human sign sensing terminal 2 mainly includes temperature sensor, blood pressure sensor, pulse sensor and bio-electricity sensor etc. when one of them polar line electricity of flexible microstrip transmission line 1 connection sensing detection device's one end connects human sign sensing terminal 2, specifically for after drawing out a plurality of polar lines this polar line electricity respectively connect temperature sensor, blood pressure sensor, pulse sensor and bio-electricity sensor etc..
The sensing information collecting circuit 3 transmits a control signal to an input end of the directional coupler, the radio frequency signal detecting circuit 4 transmits a radio frequency signal through a signal source, the radio frequency signal is transmitted to the power distributor for processing and then divided into two paths of signals, one path of signal is transmitted to the comparison circuit to serve as a reference signal, the other path of signal is transmitted to an input end of the directional coupler to serve as a detection signal, the directional coupler couples the control signal and the detection signal and then outputs a coupling end of the directional coupler, and the control signal and the detection signal are further transmitted to the human body sign sensing terminal 2 through the flexible microstrip transmission line 1.
The coupled control signal and detection signal are transmitted to a first low-pass filter of a low-pass reflection device of the human body sign sensing terminal 2, the control signal and the detection signal are separated into the control signal and the detection signal through low-pass filtering processing of the first low-pass filter, the control signal is input into the sensing terminal device from the first low-pass filter, the control signal controls the sensing terminal device to acquire human body signs to acquire the sensing signal of the human body, and the sensing terminal device transmits the sensing signal to the first low-pass filter and outputs the sensing signal; the detection signal is output to the radio frequency reflector from the first low pass filter, and the detection signal is directly returned to be a reflection signal; the reflected signal and the sensing signal are jointly transmitted to a second low-pass filter of a low-pass coupling device of the sensing detection device through the flexible microstrip transmission line 1, low-pass filtering processing is carried out through the second low-pass filter and the reflected signal and the sensing signal are separated into the reflected signal and the sensing signal, and the reflected signal is output to the input end of the directional coupler from the second low-pass filter and is output to the comparison circuit from the output end of the directional coupler; the sensing signal is output from the second low-pass filter to the sensing information collecting circuit 3.
Before the reflection signal and the sensing signal are transmitted together through the flexible microstrip transmission line 1, the reflection signal and the sensing signal can be input into a preset coupler for coupling, then output and transmitted together through the flexible microstrip transmission line 1.
The sensing information collecting circuit 3 converts the sensing signals to obtain sensing information and collects the sensing information, wherein the sensing information mainly comprises information of human body temperature, blood pressure, pulse, bioelectricity and the like and is used for reflecting the physical sign state of the human body.
The comparison circuit compares the reflected signal with the reference signal to obtain the reflection coefficient of the reflected signal, and simultaneously obtains information such as the phase difference between the reflected signal and the reference signal; the radio frequency signal detection circuit 4 obtains the circuit input impedance of the person, and finally compares the circuit input impedance of the radio frequency signal detection circuit 4, the reflection coefficient, the phase difference and the like of the reflection signal with the preset action change index to detect the action of the human body, so as to obtain the action change of the human body under the condition of the current sensing information.
For the human body sensing information transmission function, low-frequency carrier frequency band 5 transmission is adopted, and transmission signals are control information and sensing information. For the human behavior detection function, a high-frequency carrier frequency band 6 is adopted for transmission, and transmission signals are detection signals and reflection signals. Both low frequency information and high frequency information are transmitted on the same path of the flexible microstrip transmission line 1.
The preset action change index is specifically a circuit input impedance and a reflection coefficient of a reflected signal of the radio frequency signal detection circuit 4 corresponding to a plurality of action changes, and the corresponding action changes are obtained by referring to the circuit input impedance and the reflection coefficient in the preset action change index according to the circuit input impedance and the reflection coefficient obtained through system detection.
As shown in fig. 3 and 4, the human body sensing information transmission and human body behavior detection method of the present invention includes the steps of:
the method comprises the following steps: the human body physical sign sensing terminal 2 is worn on the surface of human skin such as a wrist, the flexible microstrip transmission line 1 is attached to the surface of the human skin or embedded into human clothes, and the sensing detection device is arranged outside the human body.
Step two: the control signal of 100kHz is transmitted to the directional coupler through the sensing information collecting circuit 3, meanwhile, the radio frequency signal detecting circuit 4 transmits a radio frequency signal of 500MHz through a signal source, the radio frequency signal is transmitted to the power distributor for processing and then divided into two paths of signals, one path of signal is transmitted to the comparison circuit to serve as a reference signal, the other path of signal is transmitted to the directional coupler as a detection signal, the directional coupler couples the control signal and the detection signal and then outputs the coupling end of the directional coupler, and the control signal and the detection signal are further transmitted to the human body sign sensing terminal 2 through the flexible microstrip transmission line 1.
The sensing information collecting circuit 3 transmits a control signal to the directional coupler, specifically, the sensing information collecting circuit 3 transmits the control signal, and the control signal is converted into the control signal after analog-to-digital conversion, signal amplification and low-pass filtering processing in the sensing information collecting circuit 3 and then transmitted to the directional coupler.
Step three: the coupled control signal and detection signal are transmitted to a first low-pass filter of a low-pass reflection device of the human body sign sensing terminal 2, the control signal and the detection signal are separated into the control signal and the detection signal through low-pass filtering processing of the first low-pass filter, the control signal is input into the sensing terminal device from the first low-pass filter, the control signal controls the sensing terminal device to acquire human body signs to acquire the sensing signal of the human body, and the sensing terminal device transmits the sensing signal to the first low-pass filter and outputs the sensing signal; the detection signal is output from the first low-pass filter to the radio frequency reflector, and the detection signal is directly returned to be a reflection signal.
The sensing terminal device of the human body sign sensing terminal 2 mainly comprises a baseband circuit 7, an analog circuit 8 and a sensing terminal; the low-pass filter is electrically connected with the analog circuit 8, the baseband circuit 7 and the sensing terminal in sequence.
The control signal is transmitted to the analog circuit 8 and the baseband circuit 7 in sequence, and is converted into control information of 10kHz after being subjected to band-pass filtering and signal amplification processing of the analog circuit 8 and down-conversion demodulation processing of the baseband circuit 7, the control information controls the sensing terminal of the human body physical sign sensing terminal 2 to obtain sensing information of a human body, then the sensing information is transmitted to the baseband circuit 7 and the analog circuit 8 in sequence, and is subjected to analog-to-digital conversion, digital-to-analog conversion and up-conversion modulation processing of the baseband circuit 7, and is transmitted to the low-pass filter after being subjected to signal amplification and band-pass filtering processing of the analog circuit 8, and finally is converted into a sensing signal of the human body of 100 kHz.
Step four: the reflected signal and the sensing signal are jointly transmitted to a second low-pass filter of a low-pass coupling device of the sensing detection device through the flexible microstrip transmission line 1, low-pass filtering processing is carried out through the second low-pass filter and the reflected signal and the sensing signal are separated into the reflected signal and the sensing signal, and the reflected signal is output to the input end of the directional coupler from the second low-pass filter and is output to the comparison circuit from the output end of the directional coupler; the sensing signal is output from the second low-pass filter to the sensing information collecting circuit 3.
Step five: the sensing information collecting circuit 3 converts the sensing signal to obtain sensing information and collects the sensing information. The comparison circuit compares the reflected signal with the reference signal to obtain the reflection coefficient of the reflected signal and obtain the information such as the phase difference between the reflected signal and the reference signal; the radio frequency signal detection circuit 4 obtains its own circuit input impedance.
The sensing information collecting circuit 3 converts the sensing signals to obtain sensing information, and specifically, the sensing information collecting circuit 3 sequentially amplifies and converts the sensing signals to obtain sensing information;
the reflected signal is compared with a reference signal on a comparison circuit to obtain the reflection coefficient of the reflected signal, and the radio frequency signal detection circuit 4 obtains the circuit input impedance of the radio frequency signal detection circuit;
when a human body acts or touches the flexible microstrip transmission line 1 to cause the flexible microstrip transmission line 1 to bend or be pressed, equivalent capacitance and inductance in a circuit are changed, so that microstrip impedance Z (l) of the flexible microstrip transmission line 1 n ) Changes to cause the circuit input impedance Z of the RF signal detection circuit 4 in (l) Is not equal to the characteristic impedance Z of the radio frequency signal detection circuit 4 0 The circuit input impedance of the radio frequency signal detection circuit 4 is specifically as follows:
when a human body acts or touches the flexible microstrip transmission line 1 to cause the flexible microstrip transmission line 1 to bend or press, the microstrip impedance of the flexible microstrip transmission line 1 is enabled
Figure BDA0003657269000000091
Changes to cause the circuit input impedance Z of the radio frequency signal detection circuit 4 in (l) Is not equal to the characteristic impedance Z of the radio frequency signal detection circuit 4 0 Circuit input impedance Z of the radio frequency signal detection circuit 4 in (l) The method comprises the following specific steps:
Figure BDA0003657269000000092
wherein l is the length of the flexible microstrip transmission line 1, Z in (l) Is a circuit input impedance of a radio frequency signal detection circuit 4 electrically connected with a flexible microstrip transmission line 1 of length l n In order to use the flexible microstrip transmission line 1 between the bent position or the pressed position where the flexible microstrip transmission line 1 is bent and the radio frequency signal detection circuit 4 as an impedance transmission line, the length of the obtained impedance transmission line,
Figure BDA0003657269000000093
the flexible microstrip transmission line 1 has a length l when bent or pressed n Impedance transmission line of (2); j is a complex number and β is a phase shift constant; z 0 The characteristic impedance of the circuit 4 is detected for the radio frequency signal;
after the reflection signal is compared with the reference signal on the comparison circuit, the reflection coefficient Γ (l) of the reflection signal is obtained, which is specifically as follows:
Figure BDA0003657269000000094
wherein, Γ (l) is the reflection coefficient of the radio frequency signal detection circuit 4 of the flexible microstrip transmission line 1 with the electric connection length l; the reflection coefficients of the reflection signals are different for different behaviors and touch behaviors of the human body, and the corresponding human body behaviors can be judged according to the change rule and the difference between the reflection signals and the reference signals.
Step six: the human body behavior is detected by comparing the circuit input impedance of the radio frequency signal detection circuit 4, the reflection coefficient, the phase difference and the like of the reflected signal with the preset action change index, and the action change of the human body under the condition of the current sensing information is obtained.

Claims (9)

1. A human body sensing information transmission and human body behavior detection system is characterized in that:
the human body sign sensing device comprises a flexible microstrip transmission line (1), a human body sign sensing terminal (2) and a sensing detection device, wherein the human body sign sensing terminal (2) and the sensing detection device are electrically connected through the flexible microstrip transmission line (1);
the human body sign sensing terminal (2) comprises a low-pass reflecting device and a sensing terminal device, and the low-pass reflecting device is electrically connected with the sensing terminal device; the sensing detection device comprises a low-pass coupling device, a sensing information collection circuit (3) and a radio frequency signal detection circuit (4), wherein the low-pass coupling device is electrically connected with the sensing information collection circuit (3) and the radio frequency signal detection circuit (4) respectively;
the low-pass coupling device and the low-pass reflection device are electrically connected through a flexible microstrip transmission line (1).
2. The system for human body sensing information transmission and human body behavior detection according to claim 1, wherein:
the low-pass reflection device of the human body sign sensing terminal (2) comprises a first low-pass filter and a radio frequency reflector, a flexible microstrip transmission line (1) is electrically connected with one end of the low-pass reflection device to lead out two-pole lines and is respectively electrically connected with the first low-pass filter and the radio frequency reflector, the first low-pass filter is electrically connected with the radio frequency reflector, and the first low-pass filter is electrically connected with the sensing terminal device;
the low-pass coupling device of the sensing detection device comprises a second low-pass filter and a directional coupler, and the flexible microstrip transmission line (1) is electrically connected with the other end of the low-pass coupling device to lead out a two-pole line and is respectively and electrically connected with the coupling ends of the second low-pass filter and the directional coupler; the second low-pass filter is respectively and electrically connected with the sensing information collecting circuit (3) and the input end of the directional coupler, the input end of the directional coupler is simultaneously and electrically connected with the sensing information collecting circuit (3) and the radio frequency signal detection circuit (4), and the output end of the directional coupler is electrically connected with the radio frequency signal detection circuit (4).
3. The human body sensing information transmission and human body behavior detection system according to claim 2, wherein:
the radio frequency signal detection circuit (4) comprises a signal source, a power divider, a comparison circuit and a behavior detector, wherein the signal source is electrically connected with the input end of the power divider, the output end of the power divider is respectively electrically connected with the input end of the directional coupler and the comparison circuit, and the output end of the directional coupler is sequentially electrically connected with the comparison circuit and the behavior detector.
4. The system for human body sensory information transmission and human body behavior detection according to claim 1, characterized in that:
the flexible microstrip transmission line (1) is specifically a microstrip line, a differential line or a coplanar waveguide.
5. The system for human body sensory information transmission and human body behavior detection according to claim 3, characterized in that:
the sensing information collection circuit (3) transmits a control signal to the input end of the directional coupler, the radio frequency signal detection circuit (4) transmits a radio frequency signal through a signal source, the radio frequency signal is transmitted to the power distributor for processing and then divided into two paths of signals, one path of signal is transmitted to the comparison circuit as a reference signal, the other path of signal is transmitted to the input end of the directional coupler as a detection signal, the directional coupler couples the control signal and the detection signal and then outputs the coupling end of the directional coupler, and the control signal and the detection signal are further transmitted to the human body sign sensing terminal (2) together through the flexible microstrip transmission line (1);
the coupled control signal and detection signal are transmitted to a first low-pass filter of a low-pass reflection device of a human body sign sensing terminal (2), the control signal and the detection signal are separated into the control signal and the detection signal through low-pass filtering processing of the first low-pass filter, the control signal is input into the sensing terminal device from the first low-pass filter, the control signal controls the sensing terminal device to acquire human body signs to obtain the sensing signal of the human body, and the sensing terminal device transmits the sensing signal to the first low-pass filter and outputs the sensing signal; the detection signal is output to the radio frequency reflector from the first low-pass filter, and the detection signal is directly returned to be a reflection signal; the reflected signal and the sensing signal are jointly transmitted to a second low-pass filter of a low-pass coupling device of the sensing detection device through a flexible microstrip transmission line (1), low-pass filtering processing is carried out through the second low-pass filter and the reflected signal and the sensing signal are separated into the reflected signal and the sensing signal, and the reflected signal is output to the input end of the directional coupler from the second low-pass filter and is output to the comparison circuit from the output end of the directional coupler; the sensing signal is output from the second low-pass filter to a sensing information collection circuit (3);
the sensing information collecting circuit (3) converts the sensing signals to obtain sensing information and collects the sensing information;
the comparison circuit compares the reflection signal with the reference signal to obtain the reflection coefficient of the reflection signal; the radio frequency signal detection circuit (4) obtains the circuit input impedance of the radio frequency signal detection circuit, and finally the circuit input impedance of the radio frequency signal detection circuit (4) and the reflection coefficient of the reflection signal are compared with the preset action change index to detect the action of the human body, so that the action change of the human body under the condition of current sensing information is obtained.
6. A method for human body sensing information transmission and human body behavior detection according to the system of any one of claims 1-5, characterized in that:
the method comprises the following steps:
the method comprises the following steps: the human body physical sign sensing terminal (2) is worn on the surface of human skin, the flexible microstrip transmission line (1) is attached to the surface of the human skin, and the sensing detection device is arranged outside a human body;
step two: a control signal is transmitted to a directional coupler through a sensing information collecting circuit (3), a radio frequency signal is transmitted to a radio frequency signal detecting circuit (4) through a signal source, the radio frequency signal is transmitted to a power distributor for processing and then divided into two paths of signals, one path of signal is transmitted to a comparison circuit to serve as a reference signal, the other path of signal is transmitted to the directional coupler as a detection signal, the directional coupler couples the control signal and the detection signal and then outputs a coupling end of the directional coupler, and the control signal and the detection signal are further transmitted to a human body sign sensing terminal (2) through a flexible microstrip transmission line (1);
step three: the coupled control signal and detection signal are transmitted to a first low-pass filter of a low-pass reflection device of a human body sign sensing terminal (2), the control signal and the detection signal are separated into the control signal and the detection signal through low-pass filtering processing of the first low-pass filter, the control signal is input into the sensing terminal device from the first low-pass filter, the control signal controls the sensing terminal device to acquire human body signs to obtain the sensing signal of the human body, and the sensing terminal device transmits the sensing signal to the first low-pass filter and outputs the sensing signal; the detection signal is output to the radio frequency reflector from the first low-pass filter, and the detection signal is directly returned to be a reflection signal;
step four: the reflected signal and the sensing signal are jointly transmitted to a second low-pass filter of a low-pass coupling device of the sensing detection device through a flexible microstrip transmission line (1), low-pass filtering processing is carried out through the second low-pass filter and the reflected signal and the sensing signal are separated into the reflected signal and the sensing signal, and the reflected signal is output to the input end of the directional coupler from the second low-pass filter and is output to the comparison circuit from the output end of the directional coupler; the sensing signal is output from the second low-pass filter to a sensing information collection circuit (3);
step five: the sensing information collecting circuit (3) converts the sensing signals to obtain sensing information and collects the sensing information;
the comparison circuit compares the reflection signal with the reference signal to obtain the reflection coefficient of the reflection signal; the radio frequency signal detection circuit (4) obtains the circuit input impedance of the radio frequency signal detection circuit;
step six: the human body behavior detection is carried out by comparing the circuit input impedance of the radio frequency signal detection circuit (4) and the reflection coefficient of the reflection signal with a preset action change index, and the action change of the human body under the condition of current sensing information is obtained.
7. The human body sensing information transmission and human body behavior detection method according to claim 6, characterized in that:
in the second step, the sensing information collecting circuit (3) transmits a control signal to the directional coupler, specifically, the sensing information collecting circuit (3) transmits control information, and the control information is converted into a control signal after analog-to-digital conversion, signal amplification and low-pass filtering processing in the sensing information collecting circuit (3) and then transmitted to the directional coupler.
8. The human body sensing information transmission and human body behavior detection method according to claim 6, characterized in that:
in the third step, the sensing terminal device of the human body physical sign sensing terminal (2) mainly comprises a baseband circuit (7), an analog circuit (8) and a sensing terminal; the low-pass filter is electrically connected with the analog circuit (8), the baseband circuit (7) and the sensing terminal in sequence;
the control signal is transmitted to the analog circuit (8) and the baseband circuit (7) in sequence, the control signal is subjected to band-pass filtering and signal amplification processing of the analog circuit (8) in sequence, the control signal is converted into control information after down-conversion demodulation processing of the baseband circuit (7), the control information controls the sensing terminal of the human body physical sign sensing terminal (2) to obtain sensing information of a human body, the sensing information is transmitted to the baseband circuit (7) and the analog circuit (8) in sequence, the sensing information is subjected to analog-to-digital conversion, digital-to-analog conversion and up-conversion modulation processing of the baseband circuit (7), the signal of the analog circuit (8) is amplified and subjected to band-pass filtering processing and then transmitted to the low-pass filter, and the sensing signal is finally converted into a sensing signal of the human body.
9. The human body sensing information transmission and human body behavior detection method according to claim 6, characterized in that:
in the fifth step, the sensing information collecting circuit (3) converts the sensing signals to obtain sensing information, specifically, the sensing information collecting circuit (3) sequentially performs signal amplification and digital-to-analog conversion on the sensing signals to obtain the sensing information;
the reflected signal is compared with a reference signal on a comparison circuit to obtain the reflection coefficient of the reflected signal, and a radio frequency signal detection circuit (4) obtains the circuit input impedance of the radio frequency signal detection circuit;
when a human body acts or touches the flexible microstrip transmission line (1) to cause the flexible microstrip transmission line (1) to bend or be pressed, the microstrip impedance Z of the flexible microstrip transmission line (1) is enabled to be ln Changes to cause the circuit input impedance Z of the radio frequency signal detection circuit (4) in (l) Is not equal to the characteristic impedance Z of the radio frequency signal detection circuit (4) 0 The circuit input impedance Z of the radio frequency signal detection circuit (4) in (l) The method comprises the following specific steps:
Figure FDA0003657268990000041
wherein, l is the length of the flexible microstrip transmission line (1), Z in (l) Is a circuit input impedance of a radio frequency signal detection circuit (4) electrically connected to a flexible microstrip transmission line (1) of length l n Bending for bending a flexible microstrip transmission line (1)The flexible microstrip transmission line (1) between the location or stressed location and the radio frequency signal detection circuit (4) is used as an impedance transmission line, the length, Z, of the obtained impedance transmission line ln The length of the flexible microstrip transmission line (1) is l when the flexible microstrip transmission line is bent or pressed n Impedance transmission line of (2); j is a complex number, β is a phase shift constant; z 0 The characteristic impedance of the radio frequency signal detection circuit (4);
after the reflection signal is compared with the reference signal on the comparison circuit, the reflection coefficient Γ (l) of the reflection signal is obtained, which is specifically as follows:
Figure FDA0003657268990000042
wherein, gamma (l) is the reflection coefficient of a radio frequency signal detection circuit (4) which is electrically connected with a flexible microstrip transmission line (1) with the length of l; the reflection coefficient of the reflected signal is different for different behaviors of the human body and touch behaviors.
CN202210564426.4A 2022-05-23 2022-05-23 Human body sensing information transmission and human body behavior detection system and method Pending CN115120208A (en)

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