CN111317457B - High-precision radar sign detector - Google Patents
High-precision radar sign detector Download PDFInfo
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- CN111317457B CN111317457B CN201910571025.XA CN201910571025A CN111317457B CN 111317457 B CN111317457 B CN 111317457B CN 201910571025 A CN201910571025 A CN 201910571025A CN 111317457 B CN111317457 B CN 111317457B
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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
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Cardiology (AREA)
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- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The invention relates to a high-precision radar sign detector. The system comprises a physical sign detector and an information processing terminal; the physical sign detector comprises a radar baseband processing module, at least one set of radar transmitting link and at least two sets of radar receiving links, wherein a plurality of sets of receiving and transmitting links are synchronous and are connected in a rigid body, the radar baseband processing module pretreats echo signals received by the radar receiving links, transmits the echo signals to the information processing terminal for further processing, and outputs heartbeat breathing signals. The invention is provided with a plurality of sets of radar receiving and transmitting systems, and eliminates the micro-motion interference of the trunk of the human body by specially processing complex signals uploaded by the plurality of sets of systems, thereby obtaining more accurate vital signs.
Description
Technical Field
The invention relates to the technical field of electronic equipment and electronic devices, in particular to a high-precision radar sign detector.
Background
Respiratory signals and cardiac signals are the most important vital signs of the human body. For patients who are still or at special work, it is of great importance to detect their vital signs. Because the existing breath heartbeat detector can be realized only by contacting with a human body, the application scene is greatly limited. The method for measuring the respiration and the heart rate by using the radar irradiation method belongs to wireless contact, is simple and convenient, and can remarkably widen the application scene of the respiration and heart rate detector.
Research and application of detecting human body vital signs by using Doppler characteristics of radar signals have long been known, but due to the influence of environmental micro-motion, such as natural micro-motion of the body or forced vibration of a cockpit seat, respiration and heartbeat detection are seriously disturbed. For a standing person, the characteristics of breathing are quite consistent due to the body jogging of the person. The frequency of the vibrations of the cockpit can also interfere with the detection of the heartbeat. Therefore, mature application schemes are difficult to see in the market at present.
Disclosure of Invention
The invention aims to provide a high-precision radar sign detector which is provided with a plurality of sets of radar receiving and transmitting systems, and eliminates micro-motion interference of human trunk by specially processing complex signals uploaded by the plurality of sets of systems, thereby obtaining more accurate vital signs.
In order to achieve the purpose, the technical scheme of the invention is as follows: a high-precision radar sign detector comprises a sign detector and an information processing terminal; the physical sign detector comprises a radar baseband processing module, at least one set of radar transmitting link and at least two sets of radar receiving links, wherein a plurality of sets of receiving and transmitting links are synchronous and are connected in a rigid body, the radar baseband processing module pretreats echo signals received by the radar receiving links, transmits the echo signals to the information processing terminal for further processing, and outputs heartbeat breathing signals.
In an embodiment of the present invention, the physical sign detector further includes a reference source, a frequency-locking multiplying power word generator, a transmitting antenna, and a receiving antenna; the radar baseband processing module, the radar transmitting link, the radar receiving link, the reference source, the frequency locking multiplying power word generator, the transmitting antenna and the receiving antenna are all arranged on an intermediate frequency/radio frequency PCB; the radar transmitting chain comprises a radar signal source module, a radio frequency transmitting link and a power amplifier which are sequentially connected, the radar receiving link comprises a low noise amplifier, a radio frequency receiving link, a frequency mixer, an intermediate frequency link and an analog-to-digital converter which are sequentially connected, and the radar baseband processing module comprises a baseband processor; the radar signal source module is also connected with a reference source, a frequency locking multiplying power word generator and a frequency mixer respectively, the power amplifier is connected with a transmitting antenna, the low noise amplifier is also connected with a receiving antenna, and the analog-to-digital converter is also connected with a baseband processor.
In one embodiment of the invention, the reference source is a low-frequency stable signal source, and the reference source and the frequency-locking multiplying power word generator work cooperatively, generate a required modulation signal through a radar signal source module, then process the modulation signal through a radio frequency transmission link and a power amplifier, and finally transmit the signal through a transmitting antenna; the receiving antenna receives the reflected radar echo signal, then sends the signal to the low noise amplifier and the radio frequency receiving link for amplification and filtering processing, then obtains an intermediate frequency signal through frequency mixing of the frequency mixer and a radar signal source, the intermediate frequency signal is converted into a digital signal through the intermediate frequency link and an analog-to-digital converter, and finally the digital signal is sent to the baseband processor for processing, and the heartbeat and respiration information of the human body is analyzed.
In an embodiment of the present invention, if the single-transmission multi-reception architecture is adopted, that is, one set of radar transmission link and at least two sets of radar reception links are adopted, the radar transmission link transmits a wide-angle antenna, and the wide-angle antenna and a reception antenna of the radar reception link point to different directions, so as to receive different space signals; if the structure is a multi-transmitting and multi-receiving structure, namely the radar transmitting link and the radar receiving link are matched one by one, the radar transmitting link transmits a directional antenna, and a receiving antenna of the radar receiving link matched with the radar transmitting link points to a corresponding direction.
Compared with the prior art, the invention has the following beneficial effects: the invention is provided with a plurality of sets of radar receiving and transmitting systems, and eliminates the micro-motion interference of the trunk of the human body by specially processing complex signals uploaded by the plurality of sets of systems, thereby obtaining more accurate vital signs.
Drawings
Fig. 1 is a system block diagram of the radar sign detector of the present invention.
Fig. 2 is a signal chain diagram of a transceiver with a single set of transmitting antennas and multiple sets of receiving antennas according to the present invention.
Fig. 3 is a signal chain diagram of a transceiver with a single set of transmitting antennas and multiple sets of receiving antennas according to the present invention.
FIG. 4 is a flow chart of the software algorithm of the present invention.
Detailed Description
The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.
The invention provides a high-precision radar sign detector which comprises a sign detector and an information processing terminal, wherein the sign detector comprises a radar body and a radar body; the physical sign detector comprises a radar baseband processing module, at least one set of radar transmitting link and at least two sets of radar receiving links, wherein a plurality of sets of receiving and transmitting links are synchronous and are connected in a rigid body, the radar baseband processing module pretreats echo signals received by the radar receiving links, transmits the echo signals to the information processing terminal for further processing, and outputs heartbeat breathing signals.
The following is a specific implementation of the present invention.
The invention provides a simple and easily-realized sign detector capable of greatly improving the anti-interference capability, and the structure of an electronic system of the sign detector is shown in figure 1. The intermediate frequency and radio frequency PCB board contains a reference source, a frequency locking multiplying power word generator, a transmitting link, a transmitting antenna, a receiving link, a baseband processor and other modules. The reference source is a low-frequency stable signal source, and the reference source and the frequency locking multiplying power word generator work cooperatively, a modulation signal required by a radar system is generated through a radar signal source module, then amplification and other processing are carried out through a radio frequency transmitting link and a power amplifier, and finally the modulation signal is transmitted through a transmitting antenna; the receiving antenna receives the transmitted radar signal, then sends the radar signal to the low noise amplifier and the radio frequency receiving link for amplification and filtering processing, then mixes the radar signal with a radar signal source to obtain an intermediate frequency signal, the intermediate frequency signal is amplified and filtered through the intermediate frequency link and is converted into a digital signal through the analog-to-digital converter, and finally the digital signal is sent to the baseband processor for processing, and information of the heartbeat and the respiration of a human body is solved.
The invention adopts two or more sets of radar receiving links, namely the receiving links are provided with at least two sets of directional antennas (the two antennas have certain space distance and different directions). One or more sets of transmit chains may be used. The multiple systems are connected through rigid bodies, and the antennas point to different directions, such as one pointing to the chest of a human body and the other pointing to the lower part of the trunk of the human body. The radar system according to the present invention may be any radar architecture, such as frequency modulated continuous wave radar, doppler radar, pulse radar, etc.
The signal processing is used for specially processing complex signals uploaded by a plurality of sets of systems, and micro-motion interference of the trunk of a human body is eliminated, so that more accurate vital signs are obtained.
The specific radar transceiving link architecture of the invention is as follows:
(1) single transmit multiple receive architecture: the system consists of a transmitter and multiple receivers, i.e., a set of transmitting antennas and multiple sets of receiving antennas, and the receiving antennas are designed according to the transmitted spatial distribution to ensure that signals in different spaces are received, as shown in fig. 2. The baseband processor performs basic processing on the received signal and outputs a target complex signal to the signal processing board.
(2) Multi-transmit multi-receive architecture: in order to improve the measurement accuracy, two sets of independent transmitting links are used to work in different frequency bands but with time synchronization, or the same frequency band but with two sets of transmitting links working in a time-sharing manner are used to combine with multiple receiving channels to form a multi-transmitting and multi-receiving transmitting and receiving system, as shown in fig. 3. The baseband processor performs basic processing on the received signal and outputs a target complex signal to the signal processing board.
The software algorithm flow required by the invention is implemented as follows:
Rf0(t),Rf1(t);t=(1:N)*(1/fsample)
analyzing the spectral characteristics of Rf0(t) -Bank and Rf1(t) -Bank and the target constraint conditions, finding the target, and extracting target information Obj0 and Obj 1. Fsample is the sampling frequency, Rf0(t) and Rf1(t) are the baseband signals received by the receiver, and Bankground is the background noise.
When a certain number of Obj0 and Obj1 are accumulated, Obj (t) is obtained by using a dynamic noise elimination algorithm.
And analyzing obj (t) to obtain vital sign information such as: respiration rate and heart rate. And outputs heart rate and respiration waveform maps obj _ heart (t) and obj _ respiration (t).
The specific flow chart of the present invention is shown in fig. 4.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (1)
1. A high-precision radar sign detector is characterized by comprising a sign detector and an information processing terminal; the physical sign detector comprises a radar baseband processing module, at least one set of radar transmitting link and at least two sets of radar receiving links, wherein a plurality of sets of receiving and transmitting links are synchronous and are in rigid connection, and the radar baseband processing module preprocesses echo signals received by the radar receiving links, transmits the echo signals to an information processing terminal for further processing and outputs heartbeat breathing signals;
the physical sign detector also comprises a reference source, a frequency locking multiplying power word generator, a transmitting antenna and a receiving antenna; the radar baseband processing module, the radar transmitting link, the radar receiving link, the reference source, the frequency locking multiplying power word generator, the transmitting antenna and the receiving antenna are all arranged on an intermediate frequency/radio frequency PCB; the radar transmitting chain comprises a radar signal source module, a radio frequency transmitting link and a power amplifier which are sequentially connected, the radar receiving link comprises a low noise amplifier, a radio frequency receiving link, a frequency mixer, an intermediate frequency link and an analog-to-digital converter which are sequentially connected, and the radar baseband processing module comprises a baseband processor; the radar signal source module is also connected with a reference source, a frequency locking multiplying power word generator and a frequency mixer respectively, the power amplifier is connected with a transmitting antenna, the low-noise amplifier is also connected with a receiving antenna, and the analog-to-digital converter is also connected with a baseband processor;
the reference source is a low-frequency stable signal source, and the reference source and the frequency locking multiplying power word generator work cooperatively, generate a required modulation signal through a radar signal source module, then process the modulation signal through a radio frequency transmitting link and a power amplifier, and finally transmit the signal through a transmitting antenna; the receiving antenna receives the reflected radar echo signal, then sends the signal to a low noise amplifier and a radio frequency receiving link for amplification and filtering processing, then obtains an intermediate frequency signal through frequency mixing of a frequency mixer and a radar signal source, the intermediate frequency signal is converted into a digital signal through an intermediate frequency link and an analog-to-digital converter, and finally the digital signal is sent to a baseband processor for processing, and the heartbeat and respiration information of the human body is analyzed;
if the structure is a single-transmitting and multi-receiving structure, namely one set of radar transmitting link and at least two sets of radar receiving links, the radar transmitting link transmits a wide-angle antenna, and the wide-angle antenna and a receiving antenna of the radar receiving link point to different directions so as to receive different space signals; if the structure is a multi-transmitting and multi-receiving structure, the antenna points to different directions, namely the radar transmitting link and the radar receiving link are matched one by one, the radar transmitting link transmits a directional antenna, and the receiving antenna of the radar receiving link matched with the radar transmitting link points to a corresponding direction;
analyzing the spectral characteristics of Rf0(t) -Bank and Rf1(t) -Bank and the target constraint conditions, finding a target, and extracting target information Obj0 and Obj 1; rf0(t) and Rf1(t) are baseband signals received by the receiver, and bank is background noise;
when a predetermined number of Obj0 and Obj1 are accumulated, obtaining Obj (t) by using a dynamic noise elimination algorithm;
and analyzing obj (t) to obtain the vital sign information: respiration rate and heart rate.
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| CN201910571025.XA CN111317457B (en) | 2019-06-28 | 2019-06-28 | High-precision radar sign detector |
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| CN201910571025.XA CN111317457B (en) | 2019-06-28 | 2019-06-28 | High-precision radar sign detector |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106175723A (en) * | 2016-06-27 | 2016-12-07 | 中国人民解放军第三军医大学第附属医院 | A kind of many life monitoring systems based on FMCW wideband radar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7898455B2 (en) * | 2007-07-17 | 2011-03-01 | Rosenbury Erwin T | Handheld instrument capable of measuring heartbeat and breathing motion at a distance |
| CN103070728A (en) * | 2013-02-06 | 2013-05-01 | 南京理工大学 | Non-contact type vital sign monitoring equipment |
| JP2016521363A (en) * | 2013-04-18 | 2016-07-21 | カリフォルニア インスティチュート オブ テクノロジー | Life detection radar |
| CN106546979B (en) * | 2016-10-08 | 2019-06-07 | 中国人民解放军第四军医大学 | A kind of ultra-wide spectrum radar type human body respiration enhancing detection method based on multi-antenna data fusion |
| CN109507653A (en) * | 2018-10-22 | 2019-03-22 | 中国人民解放军第四军医大学 | A method of multi-information perception bioradar system and its acquisition target information based on UWB |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106175723A (en) * | 2016-06-27 | 2016-12-07 | 中国人民解放军第三军医大学第附属医院 | A kind of many life monitoring systems based on FMCW wideband radar |
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