A human body sensing information transmission and human body behavior detection system and method

Abstract

The present invention discloses a system and method for human body sensing information transmission and human body behavior detection. The system includes: a human body sign sensing terminal and a sensing detection device are electrically connected through a flexible microstrip transmission line; a low-pass reflection device is electrically connected to a sensing terminal device; a low-pass coupling device is electrically connected to a sensing information collection circuit and a radio frequency signal detection circuit respectively; a low-pass coupling device and a low-pass reflection device are electrically connected through a flexible microstrip transmission line; the method includes: 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 a reflection signal; the sensing signal is converted to obtain sensing information; the reflection signal is compared with the reference signal to obtain the reflection coefficient; and the circuit input impedance is obtained, and compared with the preset motion change index to obtain the motion change of the human body under the current sensing information. The system and method of the present invention are based on wearable flexible circuits, can be used for motion monitoring, etc., and have good application value.

Description

Technical Field

[0001] The present invention relates to a human behavior detection system, and in particular to a distributed human sensor information transmission and human behavior detection system and method based on a wearable flexible radio frequency circuit. Background Art

[0002] Wearable technology is a technology that explores the integration of smart electronic devices on the body or with clothes, accessories, etc. Typical products are smart bracelets, activity trackers, etc. Wearable technology can be used to monitor the health of users. Sensors collect information such as the user's heart rate, blood pressure, and number of steps for integrated analysis, thereby providing health guidance for users. Common wearable devices on the market usually focus on the collection and analysis of human sensor information, with less development of human behavior detection functions or limited actions that can be recognized, and even fewer devices that combine the two functions. Summary of the invention

[0003] In order to solve the problems existing in the background technology, the present invention provides a system and method for human body sensing information transmission and human body behavior detection, and provides a method and system that combines human body sensing information transmission and human body behavior detection. It has low cost and can realize more functions. It is a new method applied to wearable scenarios.

[0004] The technical solution adopted by the present invention is:

[0005] 1. A human body sensor information transmission and human body behavior detection system:

[0006] 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 via the flexible microstrip transmission line.

[0007] The human body sign sensing terminal includes a low-pass reflection device and a sensing terminal device, which are electrically connected; the sensing detection device includes a low-pass coupling device, a sensing information collection circuit and a radio frequency signal detection circuit, and the low-pass coupling device is electrically connected to the sensing information collection circuit and the radio frequency signal detection circuit respectively.

[0008] The low-pass coupling device and the low-pass reflecting device are electrically connected through a flexible microstrip transmission line.

[0009] 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 to one end of the low-pass reflection device to lead out a two-pole line, and is electrically connected to the first low-pass filter and the radio frequency reflector respectively, the first low-pass filter is electrically connected to the radio frequency reflector, and the first low-pass filter is electrically connected to the sensing terminal device;

[0010] The low-pass coupling device of the sensing detection device includes a second low-pass filter and a directional coupler. The flexible microstrip transmission line is electrically connected to the other end of the low-pass coupling device to lead out a two-pole line, and is electrically connected to the coupling end of the second low-pass filter and the directional coupler respectively; the second low-pass filter is electrically connected to the sensing information collection circuit and the input end of the directional coupler respectively, the input end of the directional coupler is electrically connected to the sensing information collection circuit and the RF signal detection circuit at the same time, and the output end of the directional coupler is electrically connected to the RF signal detection circuit.

[0011] The radio frequency signal detection circuit comprises a signal source, a power divider, a comparison circuit and a behavior detector. The signal source is electrically connected to the input end of the power divider, the output end of the power divider is electrically connected to the input end of the directional coupler and the comparison circuit respectively, and the output end of the directional coupler is electrically connected to the comparison circuit and the behavior detector in turn.

[0012] The RF signal detection circuit has the functions of sending RF signals and analyzing reflected RF signals. A vector network analysis circuit can be used to analyze the S parameters of the signal.

[0013] The flexible microstrip transmission line is specifically a microstrip line, a differential line or a coplanar waveguide.

[0014] The human body sign sensing terminal mainly includes a temperature sensor, a blood pressure sensor, a pulse sensor and a bioelectric sensor, etc. When one of the pole lines at one end of the flexible microstrip transmission line connected to the sensing detection device is electrically connected to the human body sign sensing terminal, the pole line is specifically led out into several pole lines and then electrically connected to the temperature sensor, blood pressure sensor, pulse sensor and bioelectric sensor, etc.

[0015] The sensing information collection circuit transmits a control signal to the input end of the directional coupler, and at the same time, the RF signal detection circuit transmits a RF signal through a signal source. The RF signal is transmitted to a power divider for processing, and is divided into two signals after processing. One signal is transmitted to a comparison circuit as a reference signal, and the other 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 outputs them to the coupling end of the directional coupler, and then transmits them together to the human body sign sensing terminal through a flexible microstrip transmission line.

[0016] The coupled control signal and detection signal are transmitted to the first low-pass filter of the low-pass reflection device of the human body sign sensing terminal, and are low-pass filtered by the first low-pass filter to be separated into the control signal and the detection signal. The control signal is input into the sensing terminal device from the first low-pass filter, and the control signal controls the sensing terminal device to collect the human body's vital signs to obtain the human body's sensing signal. The sensing terminal device transmits the sensing signal to the first low-pass filter and outputs it; the detection signal is output from the first low-pass filter to the radio frequency reflector, and the detection signal is directly returned as a reflection signal; the reflection signal and the sensing signal are transmitted together to the second low-pass filter of the low-pass coupling device of the sensing detection device through the flexible microstrip transmission line, and are low-pass filtered by the second low-pass filter and separated into the reflection signal and the sensing signal, and the reflection signal is output from the second low-pass filter to the input end of the directional coupler, and is output from the output end of the directional coupler to the comparison circuit; the sensing signal is output from the second low-pass filter to the sensing information collection circuit.

[0017] 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, and then output and transmitted together through the flexible microstrip transmission line.

[0018] The sensor information collection circuit converts the sensor signal to obtain and collect the sensor information. The sensor information mainly includes human body temperature, blood pressure, pulse, bioelectricity and other information, which is used to reflect the physical state of the human body.

[0019] The comparison circuit compares the reflected signal with the reference signal to obtain the reflection coefficient of the reflected signal, and at the same time obtains information such as the phase difference between the reflected signal and the reference signal; the RF signal detection circuit obtains its own circuit input impedance, and finally compares the circuit input impedance of the RF signal detection circuit and the reflection coefficient and phase difference of the reflected signal with the preset motion change index to perform human behavior detection and obtain the human body's motion changes under the current sensing information.

[0020] The frequency band of the sensing signal and the control signal is the low-frequency carrier frequency band; the frequency band of the reflection signal and the detection signal is the high-frequency carrier frequency band.

[0021] The preset action change indicators are specifically the circuit input impedance of the RF signal detection circuit and the reflection coefficient of the reflected signal corresponding to several action changes. According to the circuit input impedance and reflection coefficient obtained through system detection, the corresponding action changes are obtained by referring to the circuit input impedance and reflection coefficient in the preset action change indicators.

[0022] 2. A method for transmitting human sensor information and detecting human behavior:

[0023] The human body sensor information transmission and human body behavior detection method comprises the following steps:

[0024] Step 1: Wear the human body sign sensor terminal on the surface of human skin, such as the wrist, etc. The flexible microstrip transmission line is attached to the surface of human skin or embedded in human clothing, and the sensor detection device is arranged outside the human body.

[0025] Step 2: The control signal is transmitted to the directional coupler through the sensor information collection circuit. At the same time, the RF signal detection circuit transmits the RF signal through the signal source. The RF signal is transmitted to the power divider for processing. After processing, it is divided into two signals. One signal is transmitted to the comparison circuit as a reference signal, and the other signal is transmitted to the directional coupler as a detection signal. The directional coupler couples the control signal and the detection signal and outputs them to the coupling end of the directional coupler. Then, they are transmitted to the human body sign sensing terminal through the flexible microstrip transmission line.

[0026] Step three: The coupled control signal and detection signal are transmitted to the first low-pass filter of the low-pass reflection device of the human body vital sign sensing terminal, and are low-pass filtered by the first low-pass filter to separate them into the control signal and the detection signal. 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 collect the vital signs of the human body to obtain the sensing signal of the human body. The sensing terminal device transmits the sensing signal to the first low-pass filter and outputs it. The detection signal is output from the first low-pass filter to the radio frequency reflector, and the detection signal is directly returned as a reflection signal.

[0027] Step 4: The reflected signal and the sensing signal are transmitted together to the second low-pass filter of the low-pass coupling device of the sensor detection device through the flexible microstrip transmission line, and are low-pass filtered and separated into the reflected signal and the sensing signal through the second low-pass filter. The reflected signal is output from the second low-pass filter to the input end of the directional coupler, and is output from the output end of the directional coupler to the comparison circuit; the sensing signal is output from the second low-pass filter to the sensing information collection circuit.

[0028] Step 5: The sensor information collection circuit converts the sensor signal to obtain and collect the sensor information.

[0029] 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 its own circuit input impedance.

[0030] Step 6: By comparing the circuit input impedance of the RF signal detection circuit, the reflection coefficient of the reflected signal, and the phase difference with the preset motion change index, human behavior detection is performed to obtain the human body's motion changes under the current sensing information.

[0031] In the step 2, a control signal is transmitted to the directional coupler through the sensing information collection circuit. Specifically, the sensing information collection circuit sends control information, and the control information is converted into a control signal after analog-to-digital conversion, signal amplification and low-pass filtering in the sensing information collection circuit, and then transmitted to the directional coupler.

[0032] In the step three, the sensor terminal device of the human body sign sensor terminal mainly includes a baseband circuit, an analog circuit and a sensor terminal; the low-pass filter is electrically connected to the analog circuit, the baseband circuit and the sensor terminal in sequence.

[0033] The control signal is transmitted to the analog circuit and the baseband circuit in sequence, and is converted into control information after being processed by the bandpass filtering and signal amplification of the analog circuit and the down-conversion demodulation of the baseband circuit. The control information controls the sensor terminal of the human body vital sign sensor terminal to obtain the sensing information of the human body, and then the sensing information is transmitted to the baseband circuit and the analog circuit in sequence, and is processed by the analog-to-digital conversion, digital-to-analog conversion and up-conversion modulation of the baseband circuit, and the signal amplification and bandpass filtering of the analog circuit, and is transmitted to the low-pass filter and finally converted into the sensing signal of the human body.

[0034] In the step five, the sensing information collection circuit converts the sensing signal to obtain the sensing information. Specifically, the sensing information collection circuit performs signal amplification and digital-to-analog conversion processing on the sensing signal in sequence to obtain the sensing information.

[0035] The reflection coefficient of the reflection signal is obtained by comparing the reflection signal with the reference signal on the comparison circuit, and the radio frequency signal detection circuit obtains its own circuit input impedance.

[0036] When the human body moves or touches the flexible microstrip transmission line, causing the flexible microstrip transmission line to bend or be compressed, it will cause changes in the equivalent capacitance and inductance in the circuit, making the microstrip impedance Z of the flexible microstrip transmission line ln Changes occur, causing the circuit input impedance Z of the RF signal detection circuit to change. in (l) is not equal to the characteristic impedance Z0 of the RF signal detection circuit, the circuit input impedance Z of the RF signal detection circuit in (l) are as follows:

[0037]

[0038] Where l is the length of the flexible microstrip transmission line, Z in (l) is the circuit input impedance of the RF signal detection circuit of the flexible microstrip transmission line with an electrical connection length of l, l nThe length of the impedance transmission line obtained by using the flexible microstrip transmission line between the bent position of the flexible microstrip transmission line or the compressed position and the radio frequency signal detection circuit as an impedance transmission line, The length of the flexible microstrip transmission line when it is bent or compressed is l n The microstrip impedance caused by the impedance transmission line; j is a complex number, β is the phase shift constant; Z0 is the characteristic impedance of the RF signal detection circuit;

[0039] The reflection coefficient Γ(l) of the reflected signal is obtained by comparing the reflected signal with the reference signal on the comparison circuit, as follows:

[0040]

[0041] Wherein, Γ(l) is the reflection coefficient of the RF signal detection circuit of the flexible microstrip transmission line with an electrical connection length of l. For different behaviors and touch behaviors of the human body, the reflection coefficient of the reflected signal is different. According to this change law and the difference between the reflected signal and the reference signal, the corresponding human behavior can be judged.

[0042] The beneficial effects of the present invention are:

[0043] While transmitting sensing signals and control information, the flexible microstrip transmission line can also sense the human body touching the microstrip line, the microstrip line bending and other actions. The flexible microstrip transmission line is not only used to transmit information, but also to sense human behavior. The system and method of the present invention are based on wearable flexible radio frequency circuits and can be used for motion monitoring, etc., while realizing the human body sensing information transmission function and human body behavior detection function, and has good application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is the overall structure diagram of the system of the present invention;

[0045] Figure 2 It is a schematic diagram of signal transmission of the system of the present invention;

[0046] Figure 3 This is a structural diagram of the human body sign sensing terminal of the present invention;

[0047] Figure 4 This is a structural diagram of the sensor information collection circuit and the radio frequency signal detection circuit of the present invention;

[0048] In the figure: 1. Flexible microstrip transmission line, 2. Human body vital sign sensing terminal, 3. Sensing information collection circuit, 4. Radio frequency signal detection circuit, 5. Low frequency carrier band, 6. High frequency carrier band, 7. Baseband circuit, 8. Analog circuit. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] like Figure 1 and Figure 2 As shown, 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, and the human body sign sensing terminal 2 and the sensing detection device are electrically connected through the flexible microstrip transmission line 1.

[0051] The human body sign sensing terminal 2 includes a low-pass reflection device and a sensing terminal device, which are electrically connected; the sensing detection device includes a low-pass coupling device, a sensing information collection circuit 3 and a radio frequency signal detection circuit 4, and the low-pass coupling device is electrically connected to 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.

[0052] The low-pass reflection device of the human body sign sensing terminal 2 includes a first low-pass filter and a radio frequency reflector. The flexible microstrip transmission line 1 is electrically connected to one end of the low-pass reflection device to lead out a two-pole line, and is electrically connected to the first low-pass filter and the radio frequency reflector respectively. The first low-pass filter is electrically connected to the radio frequency reflector, and the first low-pass filter is electrically connected to the sensing terminal device.

[0053] The low-pass coupling device of the sensing detection device includes a second low-pass filter and a directional coupler. The flexible microstrip transmission line 1 is electrically connected to the other end of the low-pass coupling device to lead out a two-pole line, and is electrically connected to the coupling end of the second low-pass filter and the directional coupler respectively; the second low-pass filter is electrically connected to the sensing information collection circuit 3 and the input end of the directional coupler respectively, the input end of the directional coupler is electrically connected to the sensing information collection circuit 3 and the RF signal detection circuit 4 at the same time, and the output end of the directional coupler is electrically connected to the RF signal detection circuit 4.

[0054] The radio frequency signal detection circuit 4 includes a signal source, a power divider, a comparison circuit and a behavior detector. The signal source is electrically connected to the input end of the power divider, the output end of the power divider is electrically connected to the input end of the directional coupler and the comparison circuit respectively, and the output end of the directional coupler is electrically connected to the comparison circuit and the behavior detector in sequence. The radio frequency signal detection circuit 4 has the function of sending radio frequency signals and analyzing reflected radio frequency signals, and can use a vector network analysis circuit to analyze the S parameters of the signal.

[0055] The flexible microstrip transmission line 1 is specifically a microstrip line, a differential line or a coplanar waveguide, etc. The human body sign sensing terminal 2 mainly includes a temperature sensor, a blood pressure sensor, a pulse sensor and a bioelectric sensor, etc. When one of the pole lines at one end of the flexible microstrip transmission line 1 connected to the sensing detection device is electrically connected to the human body sign sensing terminal 2, the pole line is specifically led out to several pole lines and then electrically connected to the temperature sensor, the blood pressure sensor, the pulse sensor and the bioelectric sensor, etc.

[0056] The sensing information collection circuit 3 transmits a control signal to the input end of the directional coupler. At the same time, the RF signal detection circuit 4 transmits a RF signal through a signal source. The RF signal is transmitted to the power divider for processing. After processing, it is divided into two signals. One signal is transmitted to the comparison circuit as a reference signal, and the other 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 outputs them to the coupling end of the directional coupler, and then transmits them to the human body sign sensing terminal 2 through the flexible microstrip transmission line 1.

[0057] The coupled control signal and detection signal are transmitted to the first low-pass filter of the low-pass reflection device of the human body sign sensing terminal 2, and are low-pass filtered by the first low-pass filter to be separated into the control signal and the detection signal. The control signal is input into the sensing terminal device from the first low-pass filter, and the control signal controls the sensing terminal device to collect the human body's vital signs to obtain the human body's sensing signal. The sensing terminal device transmits the sensing signal to the first low-pass filter and outputs it; the detection signal is output from the first low-pass filter to the radio frequency reflector, and the detection signal is directly returned as a reflection signal; the reflection signal and the sensing signal are transmitted together to the second low-pass filter of the low-pass coupling device of the sensing detection device through the flexible microstrip transmission line 1, and are low-pass filtered and separated into the reflection signal and the sensing signal by the second low-pass filter. The reflection signal is output from the second low-pass filter to the input end of the directional coupler, and is output from the output end of the directional coupler to the comparison circuit; the sensing signal is output from the second low-pass filter to the sensing information collection circuit 3.

[0058] 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 may be input into a preset coupler for coupling, and then output and transmitted together through the flexible microstrip transmission line 1 .

[0059] The sensor information collection circuit 3 converts the sensor signal to obtain and collect the sensor information. The sensor information mainly includes human body temperature, blood pressure, pulse, bioelectricity and other information, which are used to reflect the physical state of the human body.

[0060] The comparison circuit compares the reflected signal with the reference signal to obtain the reflection coefficient of the reflected signal, and obtains information such as the phase difference between the reflected signal and the reference signal; the RF signal detection circuit 4 obtains its own circuit input impedance, and finally compares the circuit input impedance of the RF signal detection circuit 4 and the reflection coefficient and phase difference of the reflected signal with the preset motion change index to perform human behavior detection and obtain the motion changes of the human body under the current sensing information.

[0061] For the human body sensing information transmission function, low-frequency carrier frequency band 5 is used for transmission, and the transmission signals are control information and sensing information. For the human body behavior detection function, high-frequency carrier frequency band 6 is used for transmission, and the 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.

[0062] The preset action change indicators are specifically the circuit input impedance of the RF signal detection circuit 4 and the reflection coefficient of the reflected signal corresponding to several action changes. According to the circuit input impedance and reflection coefficient obtained through system detection, the corresponding action changes are obtained by referring to the circuit input impedance and reflection coefficient in the preset action change indicators.

[0063] like Figure 3 and Figure 4 As shown, the human body sensor information transmission and human body behavior detection method of the present invention comprises the following steps:

[0064] Step 1: Wear the human body sign sensing terminal 2 on the surface of human skin, such as the wrist, etc., the flexible microstrip transmission line 1 is attached to the surface of human skin or embedded in human clothing, and the sensing detection device is arranged outside the human body.

[0065] Step 2: The sensor information collection circuit 3 transmits a 100kHz control signal to the directional coupler. At the same time, the RF signal detection circuit 4 transmits a 500MHz RF signal through the signal source. The RF signal is transmitted to the power divider for processing. After processing, it is divided into two signals. One signal is transmitted to the comparison circuit as a reference signal, and the other signal is transmitted to the directional coupler as a detection signal. The directional coupler couples the control signal and the detection signal and outputs them to the coupling end of the directional coupler, and then transmits them to the human body sign sensing terminal 2 through the flexible microstrip transmission line 1.

[0066] The control signal is transmitted to the directional coupler through the sensor information collection circuit 3. Specifically, the sensor information collection circuit 3 sends control information, and the control information is converted into a control signal after analog-to-digital conversion, signal amplification and low-pass filtering in the sensor information collection circuit 3, and then transmitted to the directional coupler.

[0067] Step three: The coupled control signal and detection signal are transmitted to the first low-pass filter of the low-pass reflection device of the human body vital sign sensing terminal 2, and are low-pass filtered by the first low-pass filter to separate them into a control signal and a detection signal. 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 collect the vital signs of the human body to obtain the sensing signal of the human body. The sensing terminal device transmits the sensing signal to the first low-pass filter and outputs it. The detection signal is output from the first low-pass filter to the radio frequency reflector, and the detection signal is directly returned as a reflection signal.

[0068] The sensing terminal device of the human body sign sensing terminal 2 mainly includes a baseband circuit 7, an analog circuit 8 and a sensing terminal; the low-pass filter is electrically connected to the analog circuit 8, the baseband circuit 7 and the sensing terminal in sequence.

[0069] The control signal is transmitted to the analog circuit 8 and the baseband circuit 7 in sequence, and is converted into 10kHz control information after being subjected to bandpass 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 vital sign sensing terminal 2 to obtain the sensing information of the human body, and then the sensing information is transmitted to the baseband circuit 7 and the analog circuit 8 in sequence, and is transmitted to the low-pass filter after being subjected to analog-to-digital conversion, digital-to-analog conversion and up-conversion modulation processing of the baseband circuit 7, and signal amplification and bandpass filtering processing of the analog circuit 8, and finally converted into a 100kHz human body sensing signal.

[0070] Step 4: The reflected signal and the sensing signal are transmitted together to the second low-pass filter of the low-pass coupling device of the sensor detection device through the flexible microstrip transmission line 1, and are low-pass filtered and separated into the reflected signal and the sensing signal through the second low-pass filter. The reflected signal is output from the second low-pass filter to the input end of the directional coupler, and is output from the output end of the directional coupler to the comparison circuit; the sensing signal is output from the second low-pass filter to the sensing information collection circuit 3.

[0071] Step 5: The sensing information collection circuit 3 converts the sensing signal to obtain sensing information and collects it. The comparison circuit compares the reflected signal with the reference signal to obtain the reflection coefficient of the reflected signal, and also obtains information such as the phase difference between the reflected signal and the reference signal; the RF signal detection circuit 4 obtains its own circuit input impedance.

[0072] The sensor information collection circuit 3 converts the sensor signal to obtain the sensor information. Specifically, the sensor information collection circuit 3 performs signal amplification and digital-to-analog conversion on the sensor signal in sequence to obtain the sensor information.

[0073] The reflection coefficient of the reflection signal is obtained by comparing the reflection signal with the reference signal on the comparison circuit, and the RF signal detection circuit 4 obtains its own circuit input impedance;

[0074] When the human body moves or touches the flexible microstrip transmission line 1, causing the flexible microstrip transmission line 1 to bend or be compressed, it will cause changes in the equivalent capacitance and inductance in the circuit, making the microstrip impedance Z(l n ) changes, thereby causing the circuit input impedance Z of the RF signal detection circuit 4 in (l) is not equal to the characteristic impedance Z0 of the RF signal detection circuit 4. The circuit input impedance of the RF signal detection circuit 4 is specifically as follows:

[0075] When the human body moves or touches the flexible microstrip transmission line 1, causing the flexible microstrip transmission line 1 to bend or be compressed, the microstrip impedance of the flexible microstrip transmission line 1 changes, thereby causing the circuit input impedance Z of the RF signal detection circuit 4 to change. in (l) is not equal to the characteristic impedance Z0 of the RF signal detection circuit 4, the circuit input impedance Z of the RF signal detection circuit 4 in (l) are as follows:

[0076]

[0077] Where l is the length of the flexible microstrip transmission line 1, Z in (l) is the circuit input impedance of the RF signal detection circuit 4 of the flexible microstrip transmission line 1 with an electrical connection length of l, l n The length of the impedance transmission line is obtained by using the flexible microstrip transmission line 1 between the bent position or the compressed position of the flexible microstrip transmission line 1 and the radio frequency signal detection circuit 4 as an impedance transmission line. The length of the flexible microstrip transmission line 1 when it is bent or compressed is l n The impedance of the microstrip caused by the impedance transmission line; j is a complex number, β is a phase shift constant; Z0 is the characteristic impedance of the RF signal detection circuit 4;

[0078] The reflection coefficient Γ(l) of the reflected signal is obtained by comparing the reflected signal with the reference signal on the comparison circuit, as follows:

[0079]

[0080] Wherein, Γ(l) is the reflection coefficient of the RF signal detection circuit 4 of the flexible microstrip transmission line 1 with an electrical connection length of l; for different behaviors and touch behaviors of the human body, the reflection coefficient of the reflected signal is different, and the corresponding human behavior can be judged according to this change law and the difference between the reflected signal and the reference signal.

[0081] Step 6: By comparing the circuit input impedance of the RF signal detection circuit 4 and the reflection coefficient and phase difference of the reflected signal with the preset motion change index, human behavior detection is performed to obtain the human body's motion changes under the current sensing information.

Claims

1. A human body sensor information transmission and human body behavior detection system, characterized in that: It 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 via the flexible microstrip transmission line (1); The human body sign sensing terminal (2) comprises a low-pass reflection device and a sensing terminal device, and the low-pass reflection device and the sensing terminal device are electrically connected; 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 to 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 via 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 to one end of the low-pass reflection device to lead out a two-pole line, and is electrically connected to the first low-pass filter and the radio frequency reflector respectively, the first low-pass filter is electrically connected to the radio frequency reflector, and the first low-pass filter is electrically connected to the sensing terminal device; The low-pass coupling device of the sensing detection device comprises a second low-pass filter and a directional coupler; the other end of the flexible microstrip transmission line (1) is electrically connected to the low-pass coupling device to lead out a two-pole line, and is electrically connected to the second low-pass filter and the coupling end of the directional coupler respectively; the second low-pass filter is electrically connected to the sensing information collection circuit (3) and the input end of the directional coupler respectively, the input end of the directional coupler is electrically connected to the sensing information collection circuit (3) and the radio frequency signal detection circuit (4) at the same time, and the output end of the directional coupler is electrically connected to the radio frequency signal detection circuit (4).

2. A human body sensor information transmission and human body behavior detection system according to claim 1, characterized in that: The radio frequency signal detection circuit (4) comprises a signal source, a power divider, a comparison circuit and a behavior detector. The signal source is electrically connected to the input end of the power divider, the output end of the power divider is electrically connected to the input end of the directional coupler and the comparison circuit respectively, and the output end of the directional coupler is electrically connected to the comparison circuit and the behavior detector in sequence.

3. A human body sensor information transmission and human body behavior detection system 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.

4. A human body sensor information transmission and human body behavior detection system according to claim 2, characterized in that: The sensing information collection circuit (3) transmits a control signal to the input end of the directional coupler, and the radio frequency signal detection circuit (4) transmits a radio frequency signal through a signal source. The radio frequency signal is transmitted to a power divider for processing, and is divided into two signals after processing. One signal is transmitted to a comparison circuit as a reference signal, and the other 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 outputs them to the coupling end of the directional coupler, and then transmits them together to the human body sign sensing terminal (2) through a flexible microstrip transmission line (1); The coupled control signal and detection signal are transmitted to the first low-pass filter of the low-pass reflection device of the human body sign sensing terminal (2), and are low-pass filtered by the first low-pass filter to be separated into the control signal and the detection signal. The control signal is input into the sensing terminal device from the first low-pass filter, and the control signal controls the sensing terminal device to collect the human body sign to obtain the human body sensing signal. The sensing terminal device transmits the sensing signal to the first low-pass filter and outputs it; the detection signal is output from the first low-pass filter to the radio frequency reflector, and the detection signal is directly returned as a reflection signal; the reflection signal and the sensing signal are transmitted together to the second low-pass filter of the low-pass coupling device of the sensing detection device through the flexible microstrip transmission line (1), and are low-pass filtered by the second low-pass filter and separated into the reflection signal and the sensing signal. The reflection signal is output from the second low-pass filter to the input end of the directional coupler, and is output from the output end of the directional coupler to the comparison circuit; the sensing signal is output from the second low-pass filter to the sensing information collection circuit (3); The sensor information collection circuit (3) converts the sensor signal to obtain sensor information and collects it; The comparison circuit compares the reflected signal with the reference signal to obtain the reflection coefficient of the reflected signal; the radio frequency signal detection circuit (4) obtains its own circuit input impedance, and finally compares the circuit input impedance of the radio frequency signal detection circuit (4) and the reflection coefficient of the reflected signal with a preset motion change index to perform human behavior detection and obtain the motion change of the human body under the current sensing information.

5. A method for transmitting human sensor information and detecting human behavior according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: Step 1: Wear the human body sign sensing terminal (2) on the surface of human skin, attach the flexible microstrip transmission line (1) to the surface of human skin, and arrange the sensing detection device outside the human body; Step 2: The control signal is transmitted to the directional coupler through the sensing information collection circuit (3), and the RF signal detection circuit (4) transmits the RF signal through the signal source. The RF signal is transmitted to the power divider for processing, and is divided into two signals after processing. One signal is transmitted to the comparison circuit as a reference signal, and the other signal is transmitted to the directional coupler as a detection signal. The directional coupler couples the control signal and the detection signal and outputs them to the coupling end of the directional coupler, and then transmits them to the human body sign sensing terminal (2) through the flexible microstrip transmission line (1); Step 3: The coupled control signal and detection signal are transmitted to the first low-pass filter of the low-pass reflection device of the human body sign sensor terminal (2), and are low-pass filtered by the first low-pass filter to separate them into the control signal and the detection signal. The control signal is input into the sensor terminal device from the first low-pass filter. The control signal controls the sensor terminal device to collect the human body sign to obtain the human body sensor signal. The sensor terminal device transmits the sensor signal to the first low-pass filter and outputs it. The detection signal is output from the first low-pass filter to the radio frequency reflector, and the detection signal is directly returned as a reflection signal. Step 4: The reflection signal and the sensing signal are transmitted together to the second low-pass filter of the low-pass coupling device of the sensor detection device through the flexible microstrip transmission line (1), and are low-pass filtered and separated into the reflection signal and the sensing signal through the second low-pass filter. The reflection signal is output from the second low-pass filter to the input end of the directional coupler, and is output from the output end of the directional coupler to the comparison circuit; the sensing signal is output from the second low-pass filter to the sensing information collection circuit (3); Step 5: The sensing information collection circuit (3) converts the sensing signal to obtain the sensing information and collects it; The comparison circuit compares the reflected signal with the reference signal to obtain the reflection coefficient of the reflected signal; the radio frequency signal detection circuit (4) obtains its own circuit input impedance; Step 6: By comparing the circuit input impedance of the radio frequency signal detection circuit (4) and the reflection coefficient of the reflected signal with the preset motion change index, human behavior detection is performed to obtain the human body's motion changes under the current sensing information.

6. A method for transmitting human sensor information and detecting human behavior according to claim 5, characterized in that: In the step 2, a control signal is transmitted to the directional coupler via the sensing information collection circuit (3), specifically, the sensing information collection circuit (3) sends control information, and the control information is converted into a control signal after being processed in sequence by analog-to-digital conversion, signal amplification and low-pass filtering in the sensing information collection circuit (3), and then transmitted to the directional coupler.

7. A method for transmitting human sensor information and detecting human behavior according to claim 5, characterized in that: In the step 3, the sensor terminal device of the human body sign sensor terminal (2) mainly includes a baseband circuit (7), an analog circuit (8) and a sensor terminal; the low-pass filter is electrically connected to the analog circuit (8), the baseband circuit (7) and the sensor 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 after being subjected to bandpass 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 sensor terminal of the human body sign sensor terminal (2) to obtain the sensor information of the human body, and then the sensor information is transmitted to the baseband circuit (7) and the analog circuit (8) in sequence, and is transmitted to the low-pass filter after being subjected to analog-to-digital conversion, digital-to-analog conversion and up-conversion modulation processing of the baseband circuit (7) and signal amplification and bandpass filtering processing of the analog circuit (8), and finally converted into the sensor signal of the human body.

8. The method for transmitting human sensor information and detecting human behavior according to claim 5, characterized in that: In the step 5, the sensing information collecting circuit (3) converts the sensing signal to obtain the sensing information. Specifically, the sensing information collecting circuit (3) performs signal amplification and digital-to-analog conversion on the sensing signal in sequence to obtain the sensing information. The reflection coefficient of the reflection signal is obtained by comparing the reflection signal with the reference signal on the comparison circuit, and the radio frequency signal detection circuit (4) obtains its own circuit input impedance; When a human body moves or touches the flexible microstrip transmission line (1), causing the flexible microstrip transmission line (1) to bend or be compressed, the microstrip impedance of the flexible microstrip transmission line (1) is reduced. changes, thereby causing the circuit input impedance Z of the RF signal detection circuit (4) to change. in (l) is not equal to the characteristic impedance Z0 of the radio frequency signal detection circuit (4), the circuit input impedance Z of the radio frequency signal detection circuit (4) in (l) are as follows: Where l is the length of the flexible microstrip transmission line (1), Z in (l) is the circuit input impedance of the radio frequency signal detection circuit (4) of the flexible microstrip transmission line (1) with an electrical connection length of l, l n The length of the impedance transmission line obtained by using the flexible microstrip transmission line (1) between the bent position or the compressed position of the flexible microstrip transmission line (1) and the radio frequency signal detection circuit (4) as an impedance transmission line, The length of the flexible microstrip transmission line (1) when it is bent or compressed is l n The impedance of the microstrip caused by the impedance transmission line; j is a complex number, β is a phase shift constant; Z0 is the characteristic impedance of the radio frequency signal detection circuit (4); The reflection coefficient Γ(l) of the reflected signal is obtained by comparing the reflected signal with the reference signal on the comparison circuit, as follows: Wherein, Γ(l) is the reflection coefficient of the radio frequency signal detection circuit (4) of the flexible microstrip transmission line (1) with an electrical connection length of l; the reflection coefficient of the reflected signal is different for different behaviors and touch behaviors of the human body.

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