CN110772239A - Non-contact physiological sign monitoring system - Google Patents
Non-contact physiological sign monitoring system Download PDFInfo
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- CN110772239A CN110772239A CN201910993326.1A CN201910993326A CN110772239A CN 110772239 A CN110772239 A CN 110772239A CN 201910993326 A CN201910993326 A CN 201910993326A CN 110772239 A CN110772239 A CN 110772239A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/225—Supports; Mounting means by structural association with other equipment or articles used in level-measurement devices, e.g. for level gauge measurement
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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
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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
- A61B5/74—Details of notification to user or communication with user or patient ; user input means
- A61B5/746—Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
- G01S7/411—Identification of targets based on measurements of radar reflectivity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
Abstract
The invention discloses a non-contact physiological sign monitoring system, which comprises an antenna unit for transmitting or receiving radio frequency signals; the radio frequency signal processing unit comprises a radio frequency transmitting channel and a radio frequency receiving channel, wherein the radio frequency receiving channel is used for transmitting an analog signal obtained by processing a signal obtained by reflecting the radio frequency signal; the analog-to-digital conversion unit is used for receiving the analog signal output by the radio frequency receiving channel and converting the analog signal into a digital signal; the digital signal processing unit is used for receiving the digital signal output by the analog-to-digital conversion unit, filtering the digital signal to obtain a physiological sign monitoring signal, and processing the time domain or frequency domain signal of the monitoring signal to obtain a signal quality index; the antenna unit is arranged on an antenna platform capable of rotating around one axis or multiple axes, and the rotation angle of the antenna platform is adjusted to obtain a corresponding signal quality index so as to determine the rotation angle of the antenna platform corresponding to the maximum value of the signal quality index. The invention can find the optimal antenna angle position and ensure the accuracy of the monitoring result.
Description
Technical Field
The invention relates to the field of physiological monitoring, in particular to a non-contact physiological sign monitoring system.
Background
The physiological parameters of human body such as respiratory and heartbeat frequency are important physiological indexes for doctors to diagnose and treat abnormal diseases related to the heart and lung. Common respiratory and heartbeat rate measurement methods usually employ contact-type means, such as an electrocardiogram. The contact type measurement mode is relatively difficult to implement for infants, and for the application occasions of monitoring human health at night in remote guardianship apartments and hotels, although a large number of wearable bracelets, watches and other products exist in the market, the contact type measurement mode is still inconvenient. With the development of science and technology, the non-contact type measuring mode based on the microwave radar can make up the defects, and has wide development prospect and application value.
A method for monitoring human body physiological sign parameters by using a microwave radar is a novel non-contact physiological signal monitoring method. When a person is in a relatively static state, the thoracic cavity generates periodic vibration due to breathing and heartbeat, the microwave radar transmits microwave signals to the human body, and the signals reflected from the human body contain information of the vibration of the thoracic cavity of the human body, wherein the information contains breathing and heartbeat frequency information. From these signals, information such as the breathing and heart rate of the human body can be extracted by a certain signal processing method and algorithm. This information can be used for routine physiological sign detection and health monitoring. The technology that the microwave radar senses the breathing and heartbeat frequency of a human body is relatively mature, and compared with a mature and professional wearable breathing and heartbeat monitoring system in the market, the microwave radar is in a non-contact type, does not need to be worn every moment, and is very convenient; meanwhile, compared with traditional security systems such as video cameras and the like, the microwave radar technology does not invade the privacy of a prisoner, and is more widely applied to the microwave radar human body identification technology particularly in countries or regions which are very concerned about personal privacy. At present, the microwave radar can achieve the matching degree (accuracy rate) of 80-85% of the professional wearable sensing technology by sensing the breathing and heartbeat frequency of a human body.
Ideally, the radar antenna faces the thoracic cavity of the monitored human body, so that the information of respiratory and heartbeat frequencies contained in signals reflected from the human body is optimal, but in actual application, the radar antenna cannot be guaranteed to face the thoracic cavity of the monitored human body constantly based on a series of reasons such as installation position limitation and movement of a monitored object. The prior art has the defect that the angle position of the antenna has important influence on the detection/monitoring result, and the improper antenna position or angle is possible.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a non-contact physiological sign monitoring system, which can accurately adjust an antenna to an optimal position so as to improve the accuracy of a human physiological sign monitoring result, and the technical scheme is as follows:
the invention provides a non-contact physiological sign monitoring system, which comprises:
the antenna unit is arranged on the rotatable antenna platform and used for transmitting or receiving radio frequency signals;
the radio frequency signal processing unit comprises a radio frequency transmitting channel for transmitting the radio frequency signal transmitted by the antenna unit and a radio frequency receiving channel for performing signal processing on the signal after the radio frequency signal is reflected and transmitting the analog signal obtained by the processing;
the analog-to-digital conversion unit is used for receiving the analog signal output by the radio frequency receiving channel and converting the analog signal into a digital signal;
the digital signal processing unit is used for receiving the digital signal output by the analog-to-digital conversion unit, filtering the digital signal to obtain a physiological sign monitoring signal, and performing time domain or frequency domain signal processing on the physiological sign monitoring signal to obtain a signal quality index;
the antenna platform is rotatable by one shaft or multiple shafts, and the rotation angle of the antenna platform is adjusted to obtain a corresponding signal quality index so as to determine the rotation angle of the antenna platform corresponding to the maximum value of the signal quality index.
Further, the physiological sign monitoring system provided by the invention further comprises a central processing unit and a driving unit, wherein the central processing unit is used for sending different angle adjusting instructions to the driving unit, the driving unit drives the antenna platform to rotate by corresponding angles under the angle adjusting instructions of the central processing unit, and the central processing unit receives corresponding signal quality indexes output by the digital signal processing unit under different angle states;
the central processing unit determines the rotation angle of the antenna platform corresponding to the maximum signal quality index so as to send an optimal angle adjusting instruction to the driving unit, and the driving unit drives the antenna platform to rotate to the corresponding optimal angle according to the optimal angle adjusting instruction.
As an optional technical solution, the digital signal processing unit performs time-domain signal processing on the physiological sign monitoring signal, and the signal quality indicator is the maximum received signal energy in a preset time period, which is obtained by the following calculation formula:
As another optional technical solution, the digital signal processing unit performs frequency domain signal processing on the physiological sign monitoring signal, and the signal quality index is the highest signal-to-noise ratio in a preset time period, which is obtained by the following calculation formula:
Further, the central processing unit is further configured to receive a physiological sign monitoring signal output by the digital signal processing unit in an optimal angle state, where the physiological sign monitoring signal includes a heartbeat and/or a respiratory frequency signal.
Furthermore, the physiological sign monitoring system provided by the invention further comprises an alarm device connected with the central processing unit, and when the central processing unit judges that the physiological sign monitoring signal exceeds a normal range threshold value, an alarm instruction is sent to the alarm device.
Further, when the central processing unit judges that the physiological sign monitoring signal exceeds a normal range threshold, the central processing unit sends a remote alarm signal to a remote client through a wireless communication unit.
Further, the number of the radio frequency transmission channels of the radio frequency signal processing unit is one, and the number of the radio frequency reception channels is one or more.
Further, the driving unit is a motor, and the number of the motors is one or more.
Optionally, the digital signal processing unit is integrated with the central processing unit or is independently arranged.
The physiological sign monitoring system and the heating system provided by the invention can produce the following beneficial effects:
a. the antenna unit is arranged on the antenna platform with an adjustable angle, so that the change of a monitoring area where the monitoring object is located can be flexibly coped with;
b. evaluating the signal quality index by a time domain or frequency domain processing mode, and accurately adjusting the antenna to the optimal position so as to improve the accuracy of the human body physiological sign monitoring result;
c. the central processing unit controls the driving mechanism to automatically drive the antenna platform so as to automatically analyze and obtain an optimal driving angle;
d. and monitoring physiological sign signals in real time, and realizing local alarm and/or remote alarm when the physiological sign signals exceed a normal range.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a basic block diagram of a non-contact physiological signs monitoring system provided by an embodiment of the invention;
FIG. 2 is a block diagram of a physiological signs monitoring system with local alarm functionality provided by an embodiment of the present invention;
fig. 3 is a block diagram of a physiological signs monitoring system with remote alarm function according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
In one embodiment of the present invention, a contactless physiological signs monitoring system is provided, see fig. 1, comprising:
the antenna unit, which is typically a unit of one or more planar antennas, is arranged on the rotatable antenna platform and is responsible for the transmission and reception of radio frequency signals. The antenna elements are mounted on the antenna platform, which allows for single or multiple axis (vertical, horizontal, and other angles) adjustment of the antenna elements.
And the radio frequency signal processing unit comprises a radio frequency transmitting channel for transmitting the radio frequency signal transmitted by the antenna unit and a radio frequency receiving channel for performing signal processing on the signal after the radio frequency signal is reflected and transmitting the analog signal obtained by processing. Specifically, the unit mainly comprises one or more radio frequency receiving channels and a radio frequency transmitting channel, wherein the radio frequency transmitting channel of the unit transmits radio frequency signals to a human body through an antenna unit, the radio frequency receiving channel performs low noise amplification on weak signals reflected from the human body from a radio frequency antenna and mixes the weak signals to obtain baseband signals, and the baseband signals are amplified and filtered through analog signals, and the analog signals with human body physiological sign information are sent to an analog-to-digital converter to perform analog-to-digital signal conversion.
And the analog-to-digital conversion unit is used for receiving the analog signal output by the radio frequency receiving channel, converting the analog signal into a digital signal and sending the digital signal to the digital signal processing unit for further processing.
And the digital signal processing unit is used for receiving the digital signal output by the analog-to-digital conversion unit, filtering the digital signal to obtain a physiological sign monitoring signal, and performing time domain or frequency domain signal processing on the physiological sign monitoring signal to obtain a signal quality index. Specifically, the unit further processes the digital signals from the analog-to-digital conversion unit, the unit includes one or more digital signal filters, filters out monitoring target signals, i.e., human physiological sign signals, and can further process the signals in time domain/frequency domain, and the unit estimates the signal quality (maximum received signal energy or maximum signal/noise ratio, etc.) index containing human physiological sign parameters.
The technology that the microwave radar senses the respiration and heartbeat frequency of a human body is relatively mature, namely, physiological sign signals of the human body, particularly respiration and heartbeat frequency signals are obtained from microwaves reflected by a radio frequency signal from the human body, which does not belong to the invention point of the invention, and the prior art can refer to the following two prior arts:
[1]Changzhan Gu,Short-Range Noncontact Sensors for Healthcare andOther Emerging Applications:A Review,Sensors 2016,16,1169，www.mdpi.com/journal/sensors；
[2]Tauhidur Rahman et al,“DoppleSleep:A Contactless Unobtrusive SleepSensing System Using Short-Range Doppler Radar”,UBICOMP'15,SEPTEMBER 7–11,2015,OSAKA,JAPAN.
the antenna platform is rotatable by one shaft or multiple shafts, the rotation angle of the antenna platform is adjusted, namely the radio frequency signal emission angle of the antenna unit is adjusted, and the digital signal processing unit outputs corresponding signal quality indexes under corresponding angles so as to determine the rotation angle of the antenna platform corresponding to the maximum value of the signal quality indexes. As an optional implementation manner, the signal quality index may be displayed by a digital oscilloscope, and then the rotation angle of the antenna platform may be manually adjusted according to a display signal of the oscilloscope.
As a preferable mode, the antenna platform can be driven and adjusted by a driving mechanism, that is, in a preferable embodiment of the present invention, the physiological sign monitoring system further includes a central processing unit and a driving unit, the central processing unit is configured to send different angle adjustment instructions to the driving unit, the driving unit drives the antenna platform to rotate by a corresponding angle under the angle adjustment instruction of the central processing unit, and the central processing unit receives corresponding signal quality indicators (maximum received signal energy or maximum signal/noise ratio) output by the digital signal processing unit in different angle states;
optionally, the digital signal processing unit is integrated with the central processing unit or is independently arranged. The central processing unit determines the rotation angle of the antenna platform corresponding to the maximum signal quality index value so as to send an optimal angle adjusting instruction to the driving unit, and the driving unit drives the antenna platform to rotate to a corresponding optimal angle according to the optimal angle adjusting instruction to serve as the optimal antenna position.
Whether the rotation angle of the antenna platform is adjusted manually or electrically, the physiological sign monitoring system provided by the embodiment of the invention can flexibly deal with the condition that the monitoring area where the monitoring object is located changes, for example, when the bed in a room changes, the antenna unit does not need to be detached and reinstalled, only the angle of the antenna unit needs to be adjusted, and the optimal angle is found by recalculating the signal quality index.
The following describes two different types of signal quality indicator acquisition manners in detail:
the first method is that the digital signal processing unit performs time domain signal processing on the physiological sign monitoring signal, and calculates the maximum received signal energy in a preset time period as a signal quality index, and the calculation formula is as follows:
Secondly, the digital signal processing unit performs frequency domain signal processing on the physiological sign monitoring signal, and calculates the highest signal/noise ratio in a preset time period as a signal quality index, wherein the calculation formula is as follows:
In one embodiment of the invention, on the one hand, the digital signal processing unit sends the signal quality indicator to the central processing unit (as described above); on the other hand, the digital signal processing unit further sends signals of human physiological signs including human heartbeat, respiratory frequency and the like to the central processing unit for further processing, and particularly preferably, under the condition that the antenna platform is confirmed and adjusted to rotate to the optimal angle state, the digital signal processing unit outputs physiological sign monitoring signals to the central processing unit, wherein the physiological sign monitoring signals include heartbeat and/or respiratory frequency signals. The central processing unit sends an instruction for adjusting the antenna to the driving unit according to the signal quality index from the digital signal processing unit until the optimal antenna position (corresponding to the maximum value of the signal quality index of the physiological sign parameter of the human body) is found, the driving unit is preferably a motor, and the number of the motors is one or more. Meanwhile, the unit further processes signals from human body physiological signs such as human heartbeat, respiratory rate and the like, monitors the human heartbeat and respiratory rate, and judges whether the monitored human heartbeat and respiratory rate are abnormal or not according to the normal range of the human heartbeat and respiratory rate. In an optional embodiment, as shown in fig. 2, the physiological sign monitoring system further includes an alarm device connected to the central processing unit, and when the central processing unit determines that the physiological sign monitoring signal exceeds a normal range threshold, an alarm instruction is sent to the alarm device, for example, the alarm device is applied to an elderly care institution, the alarm device is installed in a duty room, and the alarm device sends out signals including but not limited to generation, light, vibration, and the like in an operating state. In another alternative embodiment, as shown in fig. 3, when the central processing unit determines that the physiological sign monitoring signal exceeds the normal range threshold, the central processing unit may further transmit the heartbeat and respiratory rate data and the alarm signal to a remote client through a wireless communication unit, such as short-messaging a mobile phone or messaging a terminal App. It should be noted that the abnormality alarm mode in fig. 2 may be combined with the abnormality alarm mode in fig. 3.
The non-contact physiological sign monitoring system has the advantages that the antenna unit is arranged on the angle-adjustable antenna platform, the change of a monitoring area where a monitored object is located can be flexibly coped with, the signal quality index is evaluated in a time domain or frequency domain processing mode, and the antenna is accurately adjusted to the optimal position, so that the accuracy of the human physiological sign monitoring result is improved; the central processing unit controls the driving mechanism to automatically drive the antenna platform to an optimal angle; the physiological sign signals are monitored in real time, and when the physiological sign signals exceed a normal range, local alarm and/or remote alarm can be realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A non-contact physiological signs monitoring system, comprising:
the antenna unit is arranged on the rotatable antenna platform and used for transmitting or receiving radio frequency signals;
the radio frequency signal processing unit comprises a radio frequency transmitting channel for transmitting the radio frequency signal transmitted by the antenna unit and a radio frequency receiving channel for performing signal processing on the signal after the radio frequency signal is reflected and transmitting the analog signal obtained by the processing;
the analog-to-digital conversion unit is used for receiving the analog signal output by the radio frequency receiving channel and converting the analog signal into a digital signal;
the digital signal processing unit is used for receiving the digital signal output by the analog-to-digital conversion unit, filtering the digital signal to obtain a physiological sign monitoring signal, and performing time domain or frequency domain signal processing on the physiological sign monitoring signal to obtain a signal quality index;
the antenna platform is rotatable by one shaft or multiple shafts, and the rotation angle of the antenna platform is adjusted to obtain a corresponding signal quality index so as to determine the rotation angle of the antenna platform corresponding to the maximum value of the signal quality index.
2. The physiological signs monitoring system of claim 1, further comprising a central processing unit and a driving unit, wherein the central processing unit is configured to send different angle adjustment instructions to the driving unit, the driving unit drives the antenna platform to rotate by a corresponding angle under the angle adjustment instruction of the central processing unit, and the central processing unit receives corresponding signal quality indicators output by the digital signal processing unit in different angle states;
the central processing unit determines the rotation angle of the antenna platform corresponding to the maximum signal quality index so as to send an optimal angle adjusting instruction to the driving unit, and the driving unit drives the antenna platform to rotate to the corresponding optimal angle according to the optimal angle adjusting instruction.
3. The physiological signs monitoring system of claim 1, wherein the digital signal processing unit performs time-domain signal processing on the physiological signs monitoring signal, and the signal quality indicator is a maximum received signal energy within a preset time period, which is obtained by the following calculation formula:
4. The physiological signs monitoring system of claim 1, wherein the digital signal processing unit performs frequency domain signal processing on the physiological signs monitoring signal, and the signal quality indicator is a highest signal-to-noise ratio within a preset time period, which is obtained by the following calculation formula:
5. The physiological signs monitoring system according to claim 2, wherein the central processing unit is further configured to receive physiological signs monitoring signals output from the digital signal processing unit in an optimal angle state, and the physiological signs monitoring signals include heartbeat and/or respiratory rate signals.
6. The physiological signs monitoring system of claim 5, further comprising an alarm device connected to the central processing unit, wherein when the central processing unit determines that the physiological signs monitoring signal exceeds a normal range threshold, an alarm command is sent to the alarm device.
7. The physiological signs monitoring system of claim 5, wherein the central processing unit sends a remote alarm signal to a remote client via the wireless communication unit when the central processing unit determines that the physiological signs monitoring signal exceeds a normal range threshold.
8. The physiological signs monitoring system of claim 1, wherein the number of radio frequency transmit channels of the radio frequency signal processing unit is one and the number of radio frequency receive channels is one or more.
9. Physiological signs monitoring system according to claim 2, wherein the drive unit is a motor, the number of which is one or more.
10. The physiological signs monitoring system of claim 2, wherein the digital signal processing unit is provided integrally with or independently of the central processing unit.
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| CN112188430A (en) * | 2020-10-29 | 2021-01-05 | 深圳国人无线通信有限公司 | Personnel physiological index detection method and system based on small base station |
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