CN111856593A - In-vehicle living body loss monitoring device and method - Google Patents
In-vehicle living body loss monitoring device and method Download PDFInfo
- Publication number
- CN111856593A CN111856593A CN202010842676.0A CN202010842676A CN111856593A CN 111856593 A CN111856593 A CN 111856593A CN 202010842676 A CN202010842676 A CN 202010842676A CN 111856593 A CN111856593 A CN 111856593A
- Authority
- CN
- China
- Prior art keywords
- vehicle
- living body
- module
- domain information
- monitored
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
-
- 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
-
- 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
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/04—Systems determining presence of a target
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Radar, Positioning & Navigation (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physiology (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Cardiology (AREA)
- Biomedical Technology (AREA)
- Medical Informatics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Pulmonology (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Environmental & Geological Engineering (AREA)
- Heart & Thoracic Surgery (AREA)
- Geophysics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention provides a device and a method for monitoring the loss of a living body in a vehicle, wherein the device comprises: the front-end radio frequency module is used for transmitting a first linear frequency modulation pulse signal into the vehicle, receiving a second linear frequency modulation pulse signal reflected on a corresponding reflection path, and generating an output signal according to the first linear frequency modulation pulse signal and the second linear frequency modulation pulse signal; and the central control module is used for processing the output signal to generate two-dimensional frequency domain information, establishing an in-vehicle living body motion frequency model according to the two-dimensional frequency domain information, and monitoring the in-vehicle living body of the vehicle to be monitored according to the in-vehicle living body motion model. Therefore, the living body loss monitoring can be accurately and effectively carried out on the vehicle, and the condition of invading the privacy of the user can be effectively avoided.
Description
Technical Field
The invention relates to the technical field of vehicle monitoring, in particular to a device and a method for monitoring living body loss in a vehicle.
Background
Along with the traveling of more and more private cars and passenger cars, the use degree of the cars is higher and higher, and the requirement on the comfort level of the cars is stricter and stricter. Attention is also drawn to safety in vehicles and driving comfort. According to incomplete statistics, the automobile keeping amount in China in 2019 reaches 2.23 hundred million, and automobiles are rapidly popularized to family users. People also have some potential safety hazards and inconveniences while enjoying convenience of automobiles, such as: people often leave the high-speed service area because people do not get on the vehicle in time during traveling, and a driver can find the situation of few people after driving for a period of time, so that great inconvenience is brought to the driver; when a child or a pet is left in the car due to negligence or other reasons when the child or the pet goes out, the child or the pet is prone to suffering from heatstroke when the temperature in the car is high due to the lack of self help-seeking capability, and is frostbitten when the temperature in the car is low, or suffocates due to the lack of ventilation in the car.
In the related art, to solve the above problems, technologies such as video computer vision, infrared imaging, thermal imaging, microwave detection, etc. are generally used for in-vivo monitoring. However, when monitoring is performed by adopting technologies such as infrared imaging, thermal imaging and microwave detection, the temperature is easily influenced, so that the monitoring precision is greatly reduced; when the video computer vision technology is adopted for monitoring, the influence of factors such as light or seat shielding is easily received, so that the monitoring precision is low, and the privacy of passengers is invaded by the application of vision.
Disclosure of Invention
The invention aims to solve the technical problems and provides the in-vehicle living body loss monitoring device, which not only can accurately and effectively monitor the living body loss of the vehicle, but also can effectively avoid the condition of invading the privacy of the user.
The technical scheme adopted by the invention is as follows:
an in-vehicle living body loss monitoring device, comprising: the front-end radio frequency module is used for transmitting a first linear frequency modulation pulse signal into the vehicle, receiving a second linear frequency modulation pulse signal reflected on a corresponding reflection path, and generating an output signal according to the first linear frequency modulation pulse signal and the second linear frequency modulation pulse signal; and the central control module is used for processing the output signal to generate two-dimensional frequency domain information, establishing an in-vehicle living body motion frequency model according to the two-dimensional frequency domain information, and monitoring the in-vehicle living body of the vehicle to be monitored according to the in-vehicle living body motion model.
The front-end radio frequency module is specifically configured to: and using a phase difference between the first chirp signal and the second chirp signal as a phase of the output signal, and using a frequency difference between the first chirp signal and the second chirp signal as a frequency of the output signal to generate the output signal.
The central control module is specifically configured to: performing one-dimensional FFT processing on the output signal to generate one-dimensional frequency domain information; and performing two-dimensional FFT processing on the one-dimensional frequency domain information to generate two-dimensional frequency domain information.
The front-end radio frequency module is also used for scanning the vehicle to be monitored so as to generate an output signal to be detected; the central control module is specifically configured to perform corresponding processing on the output signal to be detected to generate two-dimensional frequency domain information to be detected, and input the two-dimensional frequency domain information to be detected into the in-vehicle living body motion frequency model to perform in-vehicle living body monitoring on the vehicle to be monitored.
The front-end radio frequency module is further used for scanning the vehicle to be monitored for N times to generate N frames of output signals to be detected, wherein N is a positive integer greater than or equal to 2; the central control module is specifically configured to perform corresponding processing on the N frames of output signals to be detected to generate N pieces of two-dimensional frequency domain information to be detected, and input the N pieces of two-dimensional frequency domain information to be detected into the in-vehicle living body motion frequency model to perform N times of in-vehicle living body monitoring on a vehicle to be monitored.
The central control module is further used for judging whether the number of times that living bodies exist in the monitored vehicle and the number of the existing living bodies is M is larger than or equal to N times or not, and determining that the living bodies exist in the vehicle and the number of the existing living bodies is M when the number of times that the living bodies exist in the monitored vehicle and the number of the existing living bodies is M is larger than or equal to N times, wherein M is a positive integer, and N is smaller than or equal to N.
The central control module is further used for acquiring the respiratory motion frequency, the heartbeat frequency and the radar scattering sectional area of the living body when the living body exists in the monitored vehicle, and classifying the living body according to the respiratory motion frequency, the heartbeat frequency and the radar scattering sectional area.
Further comprising: the display module is used for displaying the number of living bodies existing in the vehicle to be monitored; the voice prompt module is used for sending out a corresponding voice prompt according to a monitoring result; and the communication module is used for sending corresponding reminding information to corresponding terminal equipment according to the monitoring result.
Further comprising: and the temperature monitoring module is used for detecting the temperature in the vehicle to be monitored so as to generate a temperature signal and sending the temperature signal to the central control module.
A method for monitoring the loss of a living body in a vehicle comprises the following steps: transmitting a first chirp signal into the vehicle and receiving a second chirp signal reflected on a corresponding reflection path; generating an output signal from the first chirp signal and the second chirp signal; correspondingly processing the output signal to generate two-dimensional frequency domain information, and establishing a motion frequency model of the in-vehicle living body according to the two-dimensional frequency domain information; and carrying out in-vehicle living body monitoring on the vehicle to be monitored according to the in-vehicle living body motion frequency model.
The invention has the beneficial effects that:
according to the invention, the front-end radio frequency module is used for scanning the interior of the vehicle, so that the living body loss monitoring of the vehicle can be accurately and effectively carried out, and the condition of invading the privacy of a user can be effectively avoided.
Drawings
FIG. 1 is a block diagram of an in-vehicle living body loss monitoring device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a front-end rf module according to an embodiment of the present invention;
FIG. 3 is a logic diagram of a method for monitoring the loss of living body in a vehicle according to an embodiment of the present invention;
FIG. 4 is a block diagram of an in-vehicle living body loss monitoring device according to an embodiment of the present invention;
FIG. 5 is a logic diagram of a method for monitoring the loss of living bodies in a vehicle according to another embodiment of the present invention;
FIG. 6 is a logic diagram of a method for monitoring the loss of living body in a vehicle according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of the installation position of the in-vehicle living body loss monitoring device in a small car according to an embodiment of the present invention;
fig. 8 is a schematic view of the installation position of the in-vehicle living body loss monitoring device in the large passenger car according to an embodiment of the present invention;
fig. 9 is a flowchart of a method for monitoring a loss of a living body in a vehicle according to an embodiment of the present invention.
Detailed Description
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.
Fig. 1 is a block diagram schematically illustrating an in-vehicle living body loss monitoring apparatus according to an embodiment of the present invention.
As shown in fig. 1, the in-vehicle living body loss monitoring device 10 according to the embodiment of the present invention may include a front end rf module 100 and a central control module 200.
The front-end radio frequency module 100 is configured to transmit a first chirp signal into a vehicle, receive a second chirp signal reflected on a corresponding reflection path, and generate an output signal according to the first chirp signal and the second chirp signal; the central control module 200 is configured to process the output signal to generate two-dimensional frequency domain information, establish an in-vehicle living body motion frequency model according to the two-dimensional frequency domain information, and monitor an in-vehicle living body of the vehicle to be monitored according to the in-vehicle living body motion model.
According to an embodiment of the present invention, the front-end rf module 100 is specifically configured to: the phase difference between the first chirp signal and the second chirp signal is taken as the phase of the output signal, and the frequency difference between the first chirp signal and the second chirp signal is taken as the frequency of the output signal to generate the output signal.
Specifically, as shown in fig. 2, the front-end rf module 100 may include a synthesizer 110, a transmitting antenna 120, a receiving antenna 130, and a mixer 140.
Specifically, in the practical application process, the front-end rf module 100 may transmit and receive millimeter wave signals (chirp signals) by using a MIMO system with multiple transmission and multiple reception to intermittently scan the space in the vehicle, that is, as shown in fig. 3, a radar rf front-end (front-end rf module 100) may transmit chirp signals (first chirp signals) and capture signals (second chirp signals) reflected by articles in a transmission path thereof. Wherein the first chirp signal x may be generated by a synthesizer 1101(t) and transmits the first chirp signal to the vehicle interior through the transmitting antenna 120. Object to the first chirp signal x1(t) after reflection, a second chirp signal x can be reflected along the corresponding transmission path2(t) at this time, the second chirp signal x can be captured by the receiving antenna 1302(t) of (d). According to the first chirp signal x by means of a mixer 1401(t) and a second chirp signal x2(t) generating an output signal xout(t)。
Wherein the mixer 140 outputs a signal xout(t) has an instantaneous frequency equal to the first chirp signal x1(t) and a second chirp signal x2(t) difference in instantaneous frequency, output signal xout(t) is equal in phase to the first chirp signal x1(t) and a second chirp signal x2(t) phase difference. For example, when the first chirp signal x1(t)＝sin(w1t+φ1) And a second chirp signal x2(t)＝sin(w2t+φ2) Time, output signal xout(t)＝sin[(ω1-ω2)t+(φ1-φ2)]。
According to an embodiment of the present invention, the central control module 200 is specifically configured to: performing one-dimensional FFT processing on the output signal to generate one-dimensional frequency domain information; and performing two-dimensional FFT processing on the one-dimensional frequency domain information to generate two-dimensional frequency domain information.
Specifically, the front-end rf module 100 generates the output signal xoutAfter (t), the output signal x can be first corrected by the central control module 200out(t) performing one-dimensional FFT processing to obtain one-dimensional frequency domain information Xout_s(w), then for one-dimensional frequency domain information Xout_s(w) performing two-dimensional FFT processing to generate two-dimensional frequency domain information Xout_ss(w) and based on the two-dimensional frequency domain information Xout_ss(w) establishing a motion frequency model of the living body in the vehicle.
It should be noted that, in order to further improve the detection accuracy, as shown in fig. 3, the output signal x may be first output through the analog-to-digital conversion module ADCout(t) sampling the down-converted and filtered signal, and sampling the sampled digital signal Xout_s(t) is stored in the memory of the central control module 200. After acquiring the data in the memory, the central control module 200 may perform the above-mentioned operations to generate the two-dimensional frequency domain information Xout_ss(w), i.e. for the acquired digital signal Xout_s(t) performing one-dimensional FFT processing to obtain one-dimensional frequency domain information Xout_s(w) and based on the one-dimensional frequency domain information Xout_s(w) performing two-dimensional FFT processing to generate two-dimensional frequency domain information Xout_ssAnd (w) establishing a motion frequency model of the living body in the vehicle.
Further, after the in-vehicle living body motion frequency model is established, the in-vehicle living body motion frequency model can be applied to the in-vehicle living body motion frequency model to monitor the in-vehicle living body of the vehicle to be monitored.
The following describes how to perform in-vivo monitoring on a vehicle to be monitored according to an in-vivo movement frequency model in detail with reference to a specific embodiment.
According to an embodiment of the present invention, the front-end rf module 100 is further configured to scan a vehicle to be monitored to generate an output signal to be detected; the central control module 200 is specifically configured to perform corresponding processing on an output signal to be detected to generate two-dimensional frequency domain information to be detected, and input the two-dimensional frequency domain information to be detected into the in-vehicle living body motion frequency model to perform in-vehicle living body monitoring on the vehicle to be monitored.
Specifically, as shown in fig. 3, when monitoring the in-vivo driving of a vehicle to be monitored, a frame of a first chirp signal may be transmitted into the vehicle through the front-end rf module 100, where one frame includes K chirp signals (chirp signals) to complete one-time scanning of the vehicle to be monitored, and a frame of an output signal x to be detected is outputout’(t)。
It should be noted that, in order to improve the detection accuracy, the output signal x to be detected may be first detected by the high-precision analog-to-digital converter ADCout' (t) sampling the down-converted and filtered signal, i.e. the output signal x to be detected for a frameout' (t) is sampled, wherein each chirp acquires Q points, and acquires the digital signal X to be detected of one frameout_s' (t) is sent to the memory of the central control module 200(DSP) and stored, and data of K × Q points needs to be stored.
The central control module 200 acquires data in the memory and detects a frame of digital signal X to be detectedout_s' (t) performing one-dimensional FFT processing to generate one-dimensional frequency domain information to be detected, namely obtaining distance spectrum information X on the frequency domainout_r(w), and eliminating Xout_r(0) The zero frequency component of (a) has an influence on subsequent processing, and then distance spectrum information X in the frequency domainout_r(w) performing two-dimensional FFT processing, i.e., velocity-dimensional FFT processing, to obtain a distance velocity spectrum Xout_rd(w) is carried out. For distance velocity spectrum Xout_rd(w) obtaining the amplitude, searching the peak value of the obtained amplitude, screening the peak value meeting the condition, and storing the searched peak value { s [ l ]]The sequence is divided into a sequence and a sequence,and l is the number of the stored peak values, wherein the peak value information comprises distance dimension and speed dimension information, namely the two-dimensional frequency domain information to be detected.
Further, for distance spectral information Xout_r(w) MUSIC processing is carried out to obtain a distance and angle spectrum Xout_ra(w) using the peak value { s [ l ]]Sequence from Xout_ra(w) obtaining target living body azimuth angle parameter { DOA [ l ] on frequency domain information]}。
For distance velocity spectrum Xout_rdAnd (w) carrying out CFRA processing to remove the interference caused by clutter interference. Using peak values s l]Sequence from two-dimensional frequency domain information Xout_ss(w) obtaining a target living body motion frequency parameter { Doppler [ l]}. According to the obtained azimuth angle parameter { DOA [ l ] of the target living body]And a target living body motion frequency parameter { Doppler [ l }]And separating the target living body motion frequency parameters. Wherein, the breath and heartbeat of the living body in the received signal can cause micro Doppler effect, and the breath and heartbeat frequency of the detection target can be separated through the analysis of the micro Doppler frequency domain, wherein, the breath frequency of the human body is 0.1-0.5Hz, and the heartbeat frequency is 0.8-2Hz, thereby judging whether the living body exists in the vehicle and the number of the living body.
According to another embodiment of the present invention, the front-end rf module 100 is further configured to perform N scans on the vehicle to be monitored to generate N frames of output signals to be detected, where N is a positive integer greater than or equal to 2; the central control module 200 is specifically configured to perform corresponding processing on N frames of output signals to be detected to generate N pieces of two-dimensional frequency domain information to be detected, and input the N pieces of two-dimensional frequency domain information to be detected into the in-vehicle living body motion frequency model to perform N times of in-vehicle living body monitoring on a vehicle to be monitored.
According to an embodiment of the invention, the central control module 200 is further configured to: and determining whether the number of times that the living bodies exist in the monitored vehicle and the number of the existing living bodies is M is greater than or equal to N times, and determining that the living bodies exist in the vehicle and the number of the existing living bodies is M when the number of times that the living bodies exist in the monitored vehicle and the number of the existing living bodies is M is greater than or equal to N times, wherein M is a positive integer, and N is less than or equal to N.
According to an embodiment of the invention, the central control module 200 is further configured to: when a living body exists in a monitoring vehicle, the respiratory motion frequency, the heartbeat frequency and the radar scattering sectional area of the living body are obtained, and the living body is classified according to the respiratory motion frequency, the heartbeat frequency and the radar scattering sectional area.
Specifically, in order to improve the robustness of the model and ensure that the monitoring result is more accurate, as shown in fig. 3, the vehicle to be monitored may be scanned N times to generate N frames of output signals to be detected, and the above steps are repeated to generate N pieces of two-dimensional frequency domain information to be detected, and the vehicle to be monitored may be subjected to in-vehicle living body monitoring N times.
And in the scanning times N, judging whether the times that living bodies exist in the monitored vehicle and the number of the existing living bodies is M is greater than or equal to N times, and determining that the living bodies exist in the vehicle and the number of the existing living bodies is M when the times that the living bodies exist in the monitored vehicle and the number of the existing living bodies is M is greater than or equal to N times.
Further, if n is larger than or equal to P, P is a set number of times, and azimuth angle parameters { DOA [ n ] } of the detected target in n times are consistent, target classification processing is carried out, namely classification data of related people and pets in the vehicle are obtained according to target classification functions and the threshold value of the target classification functions is determined and optimized according to the immune genetic algorithm. If P < n, repeating the above process, and scanning the space in the vehicle again.
Specifically, for the classification of people and pets in the vehicle, a target classification function can be established according to the radar scattering cross sections of the people and the pets, and the inconsistency of the respiratory motion frequency and the heartbeat frequency, and a threshold value is set. The selected threshold can be subjected to iterative processing according to N times of scanning results, the immune genetic algorithm can well overcome the defect of non-convergence of multiple iterations, and the classification degree of the selected threshold is high.
According to an embodiment of the present invention, as shown in fig. 4, the in-vehicle living body loss monitoring device 10 further includes: a display module 300, a voice prompt module 400 and a communication module 500.
The display module 300 is configured to display the number of living bodies existing in a vehicle to be monitored currently; the voice prompt module 400 is used for sending out a corresponding voice prompt according to the monitoring result; the communication module 500 is configured to send corresponding reminding information to the corresponding terminal device according to the monitoring result.
According to an embodiment of the present invention, as shown in fig. 4, the in-vehicle living body loss monitoring device 10 further includes a temperature monitoring module 600, wherein the temperature monitoring module is configured to detect the temperature in the vehicle to be monitored to generate a temperature signal and send the temperature signal to the central control module.
It should be noted that, as shown in fig. 4, the in-vehicle living body loss monitoring device 10 further includes a power module 700, wherein the power module 700 is respectively connected to the front-end radio frequency module 100, the central control module 200, the display module 300, the voice prompt module 400, the communication module 500 and the temperature monitoring module 600, and is configured to supply power to the front-end radio frequency module 100, the central control module 200, the display module 300, the voice prompt module 400, the communication module 500 and the temperature monitoring module 600. The power module 700 can be used for carrying out secondary voltage reduction and filtering on the 12V power supply of the constant node of the vehicle body so as to provide relatively stable voltage for other modules.
Specifically, in practical applications, the central control module 200 may execute a corresponding control strategy according to the state of the vehicle, the monitoring result, and the temperature signal sent by the temperature monitoring module 600.
Specifically, as one possible embodiment, as shown in fig. 5, when the vehicle is turned off, the central control module 200 acquires a closing signal of the door through the CAN bus, and the keyless system detects that the key has left, at which time the front end radio frequency module 100 starts operating and transmits and receives a millimeter wave signal to the interior space of the vehicle.
When recognizing that a person or a pet is in the car, the central control module 200 may control the communication module 500 to dial a pre-stored phone number or prompt with a short message.
Further, the central control module 200 may send a command to the temperature monitoring module 600 when recognizing that a person or a pet is in the vehicle, so as to control the temperature monitoring module 600 to detect the temperature in the vehicle to be monitored. When the central control module 200 judges that the temperature in the vehicle is higher than the first set temperature or lower than the second set temperature, the vehicle body ventilation system and the air conditioning system are started to adjust the temperature in the vehicle in real time. Wherein the first set temperature is greater than the second set temperature.
In addition, when the front-end rf module 100 does not monitor the presence of a living body within the set operating time, it enters the low power consumption mode.
Therefore, after a passenger gets off the bus, whether a living body exists in the bus or not can be accurately monitored, so that the situation that people or pets are left in the bus can be effectively avoided, meanwhile, when the people or the pets are left in the bus, the temperature in the bus can be adjusted in real time, and the situation that the temperature in the bus is too high is heatstroke, the temperature in the bus is too low is frostbitten, or the situation that the interior of the bus is lack of ventilation and suffocates is effectively avoided.
As another possible embodiment, as shown in fig. 6, after the vehicle is opened, the central control module 200 acquires a closing signal of the vehicle door through the CAN bus, and at this time, the front end radio frequency module 100 starts to operate and transmits and receives a millimeter wave signal to the space inside the vehicle.
When a person or a pet is detected in the vehicle, the detected number M of living bodies in the vehicle may be stored. The front-end rf module 100 enters the low power consumption mode after operating for a set operating time.
Further, when the vehicle is turned on again, the central control module 200 acquires a closing signal of the door through the CAN bus, and at this time, the front end radio frequency module 100 starts to operate again, and transmits and receives a millimeter wave signal to the interior space of the vehicle.
When a person or a pet is detected in the car, the detected number M' of living bodies in the car may be compared with the previously stored number M of living bodies in the car. Wherein, if M-M' is greater than 0, it indicates that there is a related passenger or pet left outside the vehicle, at this time, the central control module 200 may control the voice prompt module 400 to send a corresponding voice prompt, i.e., "there is a related passenger or pet left outside the vehicle, and control the display module 300 to display corresponding information; if M-M' is less than 0, it indicates that there is a living body such as another passenger or pet mixed into the car, at this time, the central control module 200 may control the voice prompt module 400 to issue a corresponding voice prompt, i.e., "there is a living body such as another passenger or pet mixed into the car", and control the display module 300 to display corresponding information; if M-M' is equal to 0, it indicates that the previous passenger or pet is on the car, and the front end rf module 100 will enter the low power consumption mode within the set operation time. From this, when the passenger took the car once more, whether can accurately monitor whether have the live body in the car to can avoid appearing people or pet effectively and be lost outside the car, perhaps the condition in other live bodies sneak into the car, improve user's experience degree greatly.
It should be noted that, for a small car, as shown in fig. 7, the in-vehicle living body loss monitoring device 10 according to the embodiment of the present invention may be installed at a position near the front of the top in a car, and for a large passenger car, as shown in fig. 8, the in-vehicle living body loss monitoring device 10 according to the embodiment of the present invention may be installed at the top of the car, cascade-connected by using a plurality of in-vehicle living body loss monitoring devices 10, and collectively collect the number of detected living bodies to the central control module, and the front end radio frequency module may scan all spaces in the car as much as possible, thereby avoiding interference of in-vehicle seats and other sundries on detection of a target. The in-vehicle living body loss monitoring device 10 of the embodiment of the invention can stably and accurately detect target information no matter passengers and pets in a vehicle are in a sleep rest state or an active state, and millimeter wave radar can show excellent living body identification performance in a narrow and complex space in the vehicle.
Therefore, the in-vehicle living body loss monitoring device adopts a radio frequency front end and central control module single-chip integrated scheme, so that the radar system is small and exquisite in design appearance; high frequency and transmission through materials are used, which uses short wavelength, reduced antenna size, making the antenna volume small for installation within a package. The in-vehicle living body loss monitoring method based on the millimeter wave radar solves the problems that in the existing scene, due to negligence of a driver, personnel and pets are lost outside the vehicle, such as a high-speed service area and the like, and living bodies are sealed inside the vehicle, and prompts the driver. The identified living targets are classified, and the target information is subjected to iterative processing by adopting an immune genetic algorithm, so that higher target classification precision is obtained, and the accurate number of people and pets is provided for drivers. Compared with technologies based on vision, infrared, thermal imaging, microwave and the like, the millimeter wave radar is insensitive to light, dust or humidity and can not be influenced by environmental conditions in a vehicle when monitoring.
In summary, according to the in-vehicle living body loss monitoring device in the embodiment of the present invention, the front end radio frequency module transmits a first chirp signal into the vehicle, receives a second chirp signal reflected on a corresponding reflection path, generates an output signal according to the first chirp signal and the second chirp signal, and processes the output signal through the central control module to generate two-dimensional frequency domain information, establishes an in-vehicle living body motion frequency model according to the two-dimensional frequency domain information, and monitors the in-vehicle living body of the vehicle to be monitored according to the in-vehicle living body motion model. Therefore, the living body loss monitoring can be accurately and effectively carried out on the vehicle, and the condition of invading the privacy of the user can be effectively avoided.
The invention further provides an in-vehicle living body loss monitoring method corresponding to the in-vehicle living body loss monitoring device in the embodiment.
As shown in fig. 9, the method for monitoring living body loss in a vehicle according to the embodiment of the present invention may include the following steps:
and S1, transmitting the first chirp signal into the vehicle and receiving the second chirp signal reflected on the corresponding reflection path.
S2, an output signal is generated based on the first chirp signal and the second chirp signal.
And S3, performing corresponding processing on the output signal to generate two-dimensional frequency domain information, and establishing a motion frequency model of the living body in the vehicle according to the two-dimensional frequency domain information.
And S4, carrying out in-vivo monitoring on the vehicle to be monitored according to the in-vivo motion frequency model.
It should be noted that, for details not disclosed in the in-vehicle living body loss monitoring method according to the embodiment of the present invention, please refer to details disclosed in the in-vehicle living body loss monitoring device according to the embodiment of the present invention, and detailed descriptions thereof are omitted here.
According to the in-vehicle living body drop monitoring method provided by the embodiment of the invention, a first linear frequency modulation pulse signal is transmitted into a vehicle, a second linear frequency modulation pulse signal reflected on a corresponding reflection path is received, an output signal is generated according to the first linear frequency modulation pulse signal and the second linear frequency modulation pulse signal, the output signal is correspondingly processed to generate two-dimensional frequency domain information, an in-vehicle living body motion frequency model is established according to the two-dimensional frequency domain information, and the in-vehicle living body monitoring is carried out on the vehicle to be monitored according to the in-vehicle living body motion frequency model. Therefore, the living body loss monitoring can be accurately and effectively carried out on the vehicle, and the condition of invading the privacy of the user can be effectively avoided.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The utility model provides an in-vehicle living body monitoring devices that loses which characterized in that includes:
the front-end radio frequency module is used for transmitting a first linear frequency modulation pulse signal into a vehicle, receiving a second linear frequency modulation pulse signal reflected on a corresponding reflection path, and generating an output signal according to the first linear frequency modulation pulse signal and the second linear frequency modulation pulse signal;
and the central control module is used for processing the output signal to generate two-dimensional frequency domain information, establishing an in-vehicle living body motion frequency model according to the two-dimensional frequency domain information, and monitoring the in-vehicle living body of the vehicle to be monitored according to the in-vehicle living body motion model.
2. The in-vehicle living body loss monitoring device according to claim 1, wherein the front end radio frequency module is specifically configured to:
and using a phase difference between the first chirp signal and the second chirp signal as a phase of the output signal, and using a frequency difference between the first chirp signal and the second chirp signal as a frequency of the output signal to generate the output signal.
3. The in-vehicle living body loss monitoring device according to claim 1, wherein the central control module is specifically configured to:
performing one-dimensional FFT processing on the output signal to generate one-dimensional frequency domain information;
and performing two-dimensional FFT processing on the one-dimensional frequency domain information to generate two-dimensional frequency domain information.
4. The in-vehicle living body loss monitoring device according to claim 1,
the front-end radio frequency module is also used for scanning the vehicle to be monitored so as to generate an output signal to be detected; wherein the content of the first and second substances,
the central control module is specifically configured to perform corresponding processing on the output signal to be detected to generate two-dimensional frequency domain information to be detected, and input the two-dimensional frequency domain information to be detected into the in-vehicle living body motion frequency model to perform in-vehicle living body monitoring on the vehicle to be monitored.
5. The in-vehicle living body loss monitoring device according to claim 1,
the front-end radio frequency module is further used for scanning the vehicle to be monitored for N times to generate N frames of output signals to be detected, wherein N is a positive integer greater than or equal to 2; wherein the content of the first and second substances,
the central control module is specifically configured to perform corresponding processing on the N frames of output signals to be detected to generate N pieces of two-dimensional frequency domain information to be detected, and input the N pieces of two-dimensional frequency domain information to be detected into the in-vehicle living body motion frequency model to perform N times of in-vehicle living body monitoring on a vehicle to be monitored.
6. The in-vehicle living body loss monitoring device according to claim 5, wherein the central control module is further configured to:
and determining whether the number of times that the living bodies exist in the monitored vehicle and the number of the existing living bodies is M is greater than or equal to N times, and determining that the living bodies exist in the vehicle and the number of the existing living bodies is M when the number of times that the living bodies exist in the monitored vehicle and the number of the existing living bodies is M is greater than or equal to N times, wherein M is a positive integer, and N is less than or equal to N.
7. The in-vehicle living body loss monitoring device according to any one of claims 1-6, wherein the central control module is further configured to:
when a living body exists in a monitored vehicle, the respiratory motion frequency, the heartbeat frequency and the radar scattering sectional area of the living body are obtained, and the living body is classified according to the respiratory motion frequency, the heartbeat frequency and the radar scattering sectional area.
8. The in-vehicle living body loss monitoring device according to claim 1, further comprising:
the display module is used for displaying the number of living bodies existing in the vehicle to be monitored;
the voice prompt module is used for sending out a corresponding voice prompt according to a monitoring result;
and the communication module is used for sending corresponding reminding information to corresponding terminal equipment according to the monitoring result.
9. The in-vehicle living body loss monitoring device according to claim 1, further comprising:
and the temperature monitoring module is used for detecting the temperature in the vehicle to be monitored so as to generate a temperature signal and sending the temperature signal to the central control module.
10. A method for monitoring the loss of a living body in a vehicle is characterized by comprising the following steps:
transmitting a first chirp signal into the vehicle and receiving a second chirp signal reflected on a corresponding reflection path;
generating an output signal from the first chirp signal and the second chirp signal;
correspondingly processing the output signal to generate two-dimensional frequency domain information, and establishing a motion frequency model of the in-vehicle living body according to the two-dimensional frequency domain information;
and carrying out in-vehicle living body monitoring on the vehicle to be monitored according to the in-vehicle living body motion frequency model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010842676.0A CN111856593A (en) | 2020-08-20 | 2020-08-20 | In-vehicle living body loss monitoring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010842676.0A CN111856593A (en) | 2020-08-20 | 2020-08-20 | In-vehicle living body loss monitoring device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111856593A true CN111856593A (en) | 2020-10-30 |
Family
ID=72969477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010842676.0A Pending CN111856593A (en) | 2020-08-20 | 2020-08-20 | In-vehicle living body loss monitoring device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111856593A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112464840A (en) * | 2020-12-03 | 2021-03-09 | 奇瑞汽车股份有限公司 | Vehicle, in-vehicle living body detection device, in-vehicle living body detection method, and storage medium |
| CN113954778A (en) * | 2021-11-15 | 2022-01-21 | 宁波宝贝第一母婴用品有限公司 | Forgetting reminding method and related device |
| WO2022228165A1 (en) * | 2021-04-26 | 2022-11-03 | 南京楚航科技有限公司 | Method and apparatus for detecting living body in vehicle on basis of millimeter-wave radar |
-
2020
- 2020-08-20 CN CN202010842676.0A patent/CN111856593A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112464840A (en) * | 2020-12-03 | 2021-03-09 | 奇瑞汽车股份有限公司 | Vehicle, in-vehicle living body detection device, in-vehicle living body detection method, and storage medium |
| WO2022228165A1 (en) * | 2021-04-26 | 2022-11-03 | 南京楚航科技有限公司 | Method and apparatus for detecting living body in vehicle on basis of millimeter-wave radar |
| CN113954778A (en) * | 2021-11-15 | 2022-01-21 | 宁波宝贝第一母婴用品有限公司 | Forgetting reminding method and related device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111856593A (en) | In-vehicle living body loss monitoring device and method | |
| CN109774641B (en) | Method for detecting people in vehicle, radar and vehicle | |
| US6069581A (en) | High performance vehicle radar system | |
| US6400308B1 (en) | High performance vehicle radar system | |
| JP3428009B2 (en) | Radar equipment for vehicles | |
| US6380883B1 (en) | High performance vehicle radar system | |
| WO1999042856A2 (en) | High performance vehicle radar system | |
| US11061112B2 (en) | Method for monitoring the performance range of an automotive radar system | |
| CN108390918A (en) | It is positioned as key according to the mobile phone of object detection | |
| CN113945913A (en) | Method for detecting personnel in vehicle based on millimeter wave radar point cloud | |
| CN212540743U (en) | In-vehicle living body loss monitoring device | |
| CN109747639A (en) | Vehicle and its control method | |
| CN111856592A (en) | Indoor living body monitoring device and method | |
| WO2023041097A2 (en) | Interference signal detection method and apparatus, and integrated circuit, radio device and terminal | |
| CN113589277A (en) | Radar detection method and device for life body in vehicle and terminal equipment | |
| CN113805165B (en) | Method and device for detecting life body left in vehicle and method and device for controlling safety of vehicle | |
| JP2004003981A (en) | Probing method and system of distance by radar for car backing | |
| CN108205144A (en) | A kind of road work vehicle collision prewarning device, road work vehicle and anti-collision warning method | |
| GB2513929A (en) | Distance Measuring Alert Sensor for Vehicle | |
| CN110267231B (en) | Parking space identification method, device and system based on Bluetooth RSSI (received Signal Strength indicator) | |
| Li et al. | In-vehicle occupant detection system using mm-wave radar | |
| US11061108B1 (en) | Sliding window discrete Fourier transform (SWDFT) police signal warning receiver | |
| JP2010204033A (en) | Radar device for vehicle | |
| US11697395B2 (en) | Intrusion detection system for a vehicle and associated vehicle and method | |
| CN113925479B (en) | Life monitoring method and device based on intelligent vehicle-mounted box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |