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CN-121987164-A - Non-contact vital sign detecting system

CN121987164ACN 121987164 ACN121987164 ACN 121987164ACN-121987164-A

Abstract

The invention provides a non-contact vital sign detection system, which relates to the technical field of non-contact detection and comprises an ultra-wideband radar module, an infrared temperature measurement module, a core processing unit and an output unit. The ultra wideband radar module is used for transmitting nanosecond narrow pulse detection waves to a monitoring space and receiving echo signals, the infrared temperature measuring module is used for collecting infrared radiation signals sent by a monitoring target, the core processing unit is electrically connected with the ultra wideband radar module and the infrared temperature measuring module and is configured to process the echo signals and the infrared radiation signals so as to calculate and output quantitative vital sign data and space track information of the monitoring target, and the output unit is connected with the core processing unit and is used for outputting the quantitative vital sign data and the space track information. The invention can realize high-precision, quantitative and non-contact synchronous monitoring of multi-target vital signs in complex daily scenes, so as to overcome the limitation of the prior art that the prior art is influenced by clothing shielding, human body movement and distance change.

Inventors

  • WAN XIAOMING

Assignees

  • 重庆渝天扬生物科技有限公司

Dates

Publication Date
20260508
Application Date
20260128

Claims (10)

  1. 1. A non-contact vital sign detection system, comprising: The ultra-wideband radar module is used for transmitting nanosecond narrow pulse detection waves to the monitoring space and receiving echo signals containing vital sign information; The infrared temperature measuring module is used for collecting infrared radiation signals sent by the monitoring target; The core processing unit is electrically connected with the ultra-wideband radar module and the infrared temperature measurement module and is configured to process the echo signals and the infrared radiation signals so as to calculate and output quantitative vital sign data and space track information of a monitoring target; And the output unit is connected with the core processing unit and is used for outputting the quantitative vital sign data and the space track information.
  2. 2. The non-contact vital sign detection system of claim 1, wherein the core processing unit is configured to perform an initial distance estimation, in particular comprising: based on the arrival time difference algorithm, the time difference of the echo signals reaching the receiving antennas at two different positions is measured Calculating the initial distance of the monitoring target by combining the known base station coordinates The calculation satisfies the relationship: Wherein c is the speed of light, For a range difference of the target to two base stations, the target position is determined by solving a system of hyperbolic equations defined by the range difference.
  3. 3. The non-contact vital sign detection system of claim 2, wherein the core processing unit is further configured to motion compensate the echo signals, in particular comprising: from the phase of the received signal Separating out phase components caused by macroscopic motion Obtaining the compensated inching phase Wherein the phase model of the received signal is: , For the wavelength corresponding to the radar center frequency, And Periodic jog displacements caused by respiration and heartbeat respectively, The compensated micro-motion phase is: 。
  4. 4. The non-contact vital sign detection system of claim 3, wherein the core processing unit is further configured to detect the phase of the micro-motion from the micro-motion The method for extracting the respiration and heart rate signals specifically comprises the following steps: adopting a variational modal decomposition algorithm to decompose Adaptively decompose into K eigenmode functions The decomposition process is implemented by solving the constraint variation problem as follows: The constraint conditions are as follows: In the formula (I), in the formula (II), Is the center frequency of the kth component; Separating respiratory-characterizing components from the decomposed components And characterizing the heart beat 。
  5. 5. The non-contact vital sign detection system of claim 4, wherein the core processing unit is further configured to separate respiratory signals And heartbeat message Respectively performing spectral analysis, wherein the frequency corresponding to the spectral peak value is the respiratory frequency And heart rate 。
  6. 6. The non-contact vital sign detection system of claim 5, wherein the core processing unit is further configured to control the infrared thermometry module to take body temperature measurements and utilize the initial distance The dynamic compensation is carried out, and the method specifically comprises the following steps: based on infrared sensor readings Ambient temperature And the initial distance The compensated body surface temperature is calculated by the following formula : Wherein, the method comprises the steps of, For a standard emissivity of the target surface, For the purpose of calibrating the reference emissivity, Is the extinction coefficient of the atmosphere.
  7. 7. The non-contact vital sign detection system of claim 6, wherein the core processing unit is further configured to perform data fusion to calculate the respiratory rate Heart rate Compensated body surface temperature Spatiotemporal alignment is performed and combined with spatial location information obtained by continuous distance estimation to form a complete data packet containing quantitative vital signs and trajectories.
  8. 8. The non-contact vital sign detection system of claim 4, wherein the optimal decomposition level K and penalty parameters are adaptively determined using an optimization algorithm when a variational modal decomposition algorithm is employed.
  9. 9. The non-contact vital sign detection system of claim 1, wherein the ultra-wideband radar module has an effective detection radius of 3 to 8 meters and a detection accuracy of the vital sign-related micro-displacement in the range of 0.3 to 1 cm.
  10. 10. The non-contact vital sign detection system of claim 1, wherein the system is configured to perform vital sign detection in a scenario where there are multiple monitoring targets, and the core processing unit is further configured to separate echo signals from different spatial paths in conjunction with channel impulse response analysis and clustering algorithms, to achieve parallel computation of multiple target vital signs.

Description

Non-contact vital sign detecting system Technical Field The invention relates to the technical field of non-contact detection, in particular to a non-contact vital sign detection system. Background Vital sign monitoring is currently mainly achieved by contact devices (such as chest straps, wrist straps, finger grip sensors) or contactless devices based on specific band radar. Contact devices, while providing accurate quantitative data, require close fitting, are less comfortable and are not suitable for long-term continuous monitoring. Although the existing non-contact technology (such as continuous wave Doppler radar) can realize space detection to a certain extent, the existing non-contact technology mainly relies on detecting great motions such as thoracic cavity fluctuation and the like to qualitatively judge the life state, or only measures limited parameters in a controlled environment where a subject keeps still. The non-contact monitoring technology has the common defects that firstly, complete non-contact and high-precision quantitative measurement in the true sense cannot be realized, and weak respiration and heartbeat signals are difficult to effectively separate from macroscopic body movement and environmental noise and are converted into accurate values (such as heart rate and respiration rate of times/min). Secondly, the measurement accuracy is easily interfered by distance change, clothing shielding and environmental factors, so that the data reliability is insufficient. In addition, in the prior art, in the scene of simultaneous multi-target monitoring, vital signs of different individuals are difficult to distinguish and track effectively, and the functional limitation is strong. Therefore, a technology for achieving remote, high-precision, quantitative and shielding-free multi-sign synchronous monitoring in a daily activity state is needed. Disclosure of Invention In order to solve the technical problems in the related art, the invention provides a non-contact vital sign detection system. In order to achieve the above purpose, the invention adopts the following technical scheme: a non-contact vital sign detection system, comprising: The ultra-wideband radar module is used for transmitting nanosecond narrow pulse detection waves to the monitoring space and receiving echo signals containing vital sign information; The infrared temperature measuring module is used for collecting infrared radiation signals sent by the monitoring target; The core processing unit is electrically connected with the ultra-wideband radar module and the infrared temperature measurement module and is configured to process the echo signals and the infrared radiation signals so as to calculate and output quantitative vital sign data and space track information of a monitoring target; And the output unit is connected with the core processing unit and is used for outputting the quantitative vital sign data and the space track information. Optionally, the core processing unit is configured to perform an initial distance estimation, specifically including: based on the arrival time difference algorithm, the time difference of the echo signals reaching the receiving antennas at two different positions is measured Calculating the initial distance of the monitoring target by combining the known base station coordinatesThe calculation satisfies the relationship: Wherein c is the speed of light, For a range difference of the target to two base stations, the target position is determined by solving a system of hyperbolic equations defined by the range difference. Optionally, the core processing unit is further configured to perform motion compensation on the echo signal, specifically including: from the phase of the received signal Separating out phase components caused by macroscopic motionObtaining the compensated inching phaseWherein the phase model of the received signal is:, For the wavelength corresponding to the radar center frequency, AndPeriodic jog displacements caused by respiration and heartbeat respectively,The compensated micro-motion phase is:。 Optionally, the core processing unit is further configured to derive from the micro-phase The method for extracting the respiration and heart rate signals specifically comprises the following steps: adopting a variational modal decomposition algorithm to decompose Adaptively decompose into K eigenmode functionsThe decomposition process is implemented by solving the constraint variation problem as follows: The constraint conditions are as follows: in the formula, Is the center frequency of the kth component; Separating respiratory-characterizing components from the decomposed components And characterizing the heart beat。 Optionally, the core processing unit is further configured to separate the separated respiratory signalsAnd heartbeat messageRespectively performing spectral analysis, wherein the frequency corresponding to the spectral peak value is the respiratory frequenc