CN115047450A - Millimeter wave radar-based in-vehicle safety belt wearing reminding system and method - Google Patents
Millimeter wave radar-based in-vehicle safety belt wearing reminding system and method Download PDFInfo
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- 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
- G01S13/886—Radar or analogous systems specially adapted for specific applications for alarm systems
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- G—PHYSICS
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- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
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- G08B21/24—Reminder alarms, e.g. anti-loss alarms
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Abstract
The application relates to a millimeter wave radar-based reminding system and method for wearing of an in-vehicle safety belt, and relates to the technical field of intelligent cabins. The method is characterized by combining the characteristics of large detection range of a millimeter wave radar and the functions of identifying and receiving signals of a heating object, after a two-dimensional frequency spectrum matrix in a vehicle is collected, the riding state of a passenger is judged by combining the division condition and thermodynamic information serving as the interior of the vehicle, the feedback of a detection result is carried out on a vehicle MCU (microprogrammed control Unit) based on the riding state, the identification capability of the millimeter wave radar on a micro-motion target and a heat dissipation target is utilized to distinguish a human body and an object and judge the position, the false alarm rate of safety belt reminding is reduced, and the use stability when the safety belt wearing reminding is carried out is improved.
Description
Technical Field
The application relates to the technical field of intelligent cabins, in particular to a millimeter wave radar-based safety belt wearing reminding system and method in a vehicle.
Background
With the continuous improvement of the safety level requirements of automobiles, the safety is divided into active safety and passive safety. Passive safety is the ability to protect the occupant after an accident has occurred. In terms of passive safety, safety belts and airbags are in-vehicle equipment that is receiving a great deal of attention. At present, most of the in-vehicle safety belt reminding systems only aim at and comprise a front-row driver seat and a passenger seat whether to fasten a safety belt and work in cooperation with a warning lamp and a buzzer.
The main sensors used in the safety belt reminding device on the market at present are a pressure sensor and an image sensor. The pressure sensor is positioned in a cushion of the seat, and judges whether a user sits on the seat or not based on the pressure received by the pressure sensor; the image sensor is implemented as a camera, and when the camera detects that the camera is blocked or receives an image corresponding to a human face, it is determined that the user is seated.
However, in the related art, the pressure sensor cannot distinguish a human body from an object, and false alarm is caused under certain conditions; the image sensor can distinguish human bodies or objects, but has the problems of being shielded, light limitation and privacy, and even if the image sensor and the human bodies are combined, the human bodies and large anthropomorphic objects cannot be distinguished, and the image sensor cannot be normally used at night. That is, the sensor in the related art has low stability in use when giving a prompt to wear the seat belt.
Disclosure of Invention
The application relates to a millimeter wave radar-based in-vehicle safety belt wearing reminding system and method, which can improve the use stability when prompting the wearing of the safety belt, and the technical scheme is as follows:
on one hand, the in-vehicle safety belt wearing reminding system based on the millimeter wave radar comprises the millimeter wave radar, a vehicle micro-control unit MCU and safety belt wearing reminding equipment, wherein the millimeter wave radar is in communication connection with the vehicle MCU, and the vehicle micro-control unit is in communication connection with the safety belt wearing reminding equipment;
the millimeter wave radar is used for sending detection signals and receiving feedback signals; performing signal processing on the detection signal and the feedback signal to obtain an intermediate frequency signal; performing signal processing on the intermediate frequency signal to obtain a distance-angle two-dimensional frequency spectrum matrix, wherein the distance-angle two-dimensional frequency spectrum matrix is used for representing the thermodynamic state in the vehicle; calling prestored seat area division data, determining the passenger riding state by combining a two-dimensional frequency spectrum matrix, wherein the seat area division data is used for indicating the distribution condition of seats in the vehicle; generating passenger riding state data according to the passenger riding state; sending the passenger riding state data to a vehicle MCU;
the vehicle MCU is used for receiving passenger riding state data; generating a safety belt wearing prompt signal based on the passenger riding state data; sending a safety belt wearing prompt signal to safety belt wearing prompt equipment;
the safety belt wearing reminding device is used for receiving a safety belt wearing reminding signal; the prompt of wearing the safety belt is carried out based on the prompt signal of wearing the safety belt.
In another aspect, a method for reminding wearing of an interior safety belt based on a millimeter wave radar is provided, and the method is applied to the millimeter wave radar in the system for reminding wearing of an interior safety belt based on a millimeter wave radar, and the method includes:
sending a detection signal and receiving a feedback signal;
performing signal processing on the detection signal and the feedback signal to obtain an intermediate frequency signal;
performing signal processing on the intermediate frequency signal to obtain a distance-angle two-dimensional frequency spectrum matrix, wherein the distance-angle two-dimensional frequency spectrum matrix is used for representing the thermodynamic state in the vehicle;
calling prestored seat area division data, determining the passenger riding state by combining a two-dimensional frequency spectrum matrix, wherein the seat area division data is used for indicating the distribution condition of seats in the vehicle;
generating passenger riding state data according to the passenger riding state;
and transmitting the passenger riding state data to the vehicle MCU.
The beneficial effect that technical scheme that this application provided brought includes at least:
the characteristics that millimeter wave radar detection range is large and the function of discerning and signal reception is carried out to the object that generates heat, after the two-dimensional frequency spectrum matrix of gathering the inside vehicle, the division condition and the thermodynamic information that combine the inside vehicle as judge passenger's the state of taking, and carry out the feedback of testing result to vehicle MCU based on the state of taking, utilize millimeter wave radar to carry out human, the differentiation of object to the discernment ability of fine motion target and radiating object, and the judgement of position, reduce the false alarm rate that the safety belt reminded with this, improve the stability of using when carrying out the suggestion of safety belt dress.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of an in-vehicle seat belt wearing reminding system based on millimeter wave radar according to an exemplary embodiment of the present application.
Fig. 2 is a schematic diagram illustrating a position of a millimeter wave radar in a vehicle according to an exemplary embodiment of the present application.
Fig. 3 shows a flowchart of an in-vehicle seatbelt wearing alert method based on millimeter wave radar according to an exemplary embodiment of the present application.
Fig. 4 shows a flowchart of another millimeter wave radar-based in-vehicle seat belt wear reminding method according to an exemplary embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The millimeter wave radar is a radar which works in a millimeter wave band for detection. Usually, the millimeter wave is in the frequency domain of 30 to 300GHz (with a wavelength of 1 to 10 mm). Millimeter-wave radar has some of the advantages of both microwave and photoelectric radar because the wavelength of millimeter-wave waves is intermediate between microwave and centimeter waves. Compared with the centimeter wave seeker, the millimeter wave seeker has the characteristics of small volume, light weight and high spatial resolution. The application provides the application of millimeter wave radar in intelligent passenger cabin technical field promptly.
Fig. 1 shows a schematic structural diagram of an in-vehicle seat belt wearing reminder system based on a millimeter wave radar according to an exemplary embodiment of the present application, please refer to fig. 1, where the system includes a millimeter wave radar 110, a vehicle Micro Control Unit (MCU) 120 and a seat belt wearing reminder device 130, the millimeter wave radar 110 is in communication connection with the vehicle MCU120, and the vehicle micro control Unit 120 is in communication connection with the seat belt wearing reminder device 130;
in the embodiment of the application, the millimeter wave radar is located inside the vehicle, and the signals sent by the millimeter wave radar can fully cover the inside of the vehicle. Referring to fig. 2, the vehicle is illustrated as a five-seat vehicle, which includes a seat 211, a seat 212, a seat 213, a seat 214, and a seat 215. At this time, the millimeter wave radar 220 is located at the center position of the vehicle. Fig. 2 shows this example in a plan view, and it should be noted that, in actual cases, the position of the millimeter wave radar should be located on the top of the interior of the vehicle. In this case, the detection signal of the millimeter wave radar can be transmitted to all over the seats without being blocked.
It should be noted that fig. 2 is only an illustration of the placement position of an exemplary millimeter-wave radar. Corresponding to different conditions, under the condition that the millimeter wave radar is positioned at the top in the vehicle, the position of the millimeter wave radar can be adjusted at will. For example, in one example, the vehicle is a 2-seat vehicle, and the millimeter wave radar is located above a position corresponding to the main driver seat; in another example, the vehicle is a 7-seat vehicle, and the millimeter wave radar is located above a position corresponding to the rear row; in another example, the vehicle is a 5-seat vehicle, and the millimeter wave radar is located above a position corresponding to the main driver seat. The specific design position of the millimeter wave radar is not limited in the embodiment of the application.
In the embodiment of the present application, the vehicle MCU may be implemented as a control device in the vehicle-mounted central control device. The vehicle MCU has a data receiving function and a control function for the in-vehicle device. Optionally, after receiving the data sent by the millimeter wave radar, the vehicle-mounted central control device generates a prompt signal corresponding to the sent data, and controls the related vehicle-mounted device to enable a user to know the detection result of the millimeter wave radar in a form of voice prompt or visual information.
The safety belt wearing reminding device is in communication connection with the vehicle MCU, and responds to the control of the vehicle MCU to perform safety belt wearing reminding. Optionally, the seat belt wearing alert device is implemented as an independent audiovisual playing device, that is, a combination of a vehicle-mounted sound box and a display screen; or the safety belt wearing reminding device is realized as an existing vehicle-mounted influence or central control display screen in the vehicle, and a new safety belt wearing reminding function is integrated under the control of the vehicle MCU.
In this case, a millimeter wave radar for transmitting a probe signal and receiving a feedback signal; performing signal processing on the detection signal and the feedback signal to obtain an intermediate frequency signal; performing signal processing on the intermediate frequency signal to obtain a distance-angle two-dimensional frequency spectrum matrix, wherein the distance-angle two-dimensional frequency spectrum matrix is used for representing the thermodynamic state in the vehicle; calling prestored seat area division data, determining the passenger riding state by combining a two-dimensional frequency spectrum matrix, wherein the seat area division data is used for indicating the distribution condition of seats in the vehicle; generating passenger riding state data according to the passenger riding state; sending the passenger riding state data to a vehicle MCU;
the vehicle MCU is used for receiving passenger riding state data; generating a safety belt wearing prompt signal based on the passenger riding state data; sending a safety belt wearing prompt signal to safety belt wearing prompt equipment;
the safety belt wearing reminding device is used for receiving a safety belt wearing reminding signal; the prompt of wearing the safety belt is carried out based on the prompt signal of wearing the safety belt.
To sum up, the system that this application embodiment provided combines the big characteristics of millimeter wave radar detection range and to the function that the object that generates heat discerns and signal reception, after gathering the inside two-dimensional frequency spectrum matrix of vehicle, the division condition and the thermodynamic information that combine the inside as of vehicle judge passenger's the state of taking to carry out the feedback of testing result to vehicle MCU based on the state of taking, utilize millimeter wave radar to carry out human, the differentiation of object to the discernment ability of fine motion target and radiating object, and the differentiation of position, thereby reduce the false alarm rate that the safety belt reminded, improve the stability of using when carrying out the suggestion of safety belt dress.
Fig. 3 shows a flowchart of a method for reminding a wearing of an in-vehicle seat belt based on a millimeter wave radar according to an exemplary embodiment of the present application, which is described by taking the method as an example for being applied to a millimeter wave radar, and the method includes:
In the embodiment of the application, the detection signal is a continuous frequency modulation wave, and the electromagnetic wave is fed back after the continuous frequency modulation wave contacts a target in the vehicle.
The process is a process of performing signal processing on the detection signal and the feedback signal to obtain an intermediate frequency signal.
And 303, processing the intermediate frequency signal to obtain a distance-angle two-dimensional frequency spectrum matrix.
After the intermediate frequency signal is obtained, the distance characteristic and the angle characteristic of the representation target in the intermediate frequency signal are extracted in a signal processing mode, and a corresponding two-dimensional matrix is constructed. It should be noted that, in the embodiment of the present application, a plurality of intermediate frequency signals adjacent to each other in time sequence are synchronized, so that a continuous two-dimensional spectrum matrix for a target can be obtained.
In the embodiment of the application, the distance-angle two-dimensional spectrum matrix is used for representing the thermodynamic state of the interior of the vehicle. That is, the distance-angle two-dimensional spectrum matrix takes the distance as a first coordinate of each feature vector and the angle as a second coordinate of each feature vector, and the value of each feature vector indicates the thermal state in one region in the vehicle.
And step 304, calling prestored seat area division data, and determining the passenger riding state by combining the two-dimensional frequency spectrum matrix.
The seat zone division data is used to indicate the distribution of seats in the vehicle.
In the embodiment of the present application, the seat region division data indicates the region position corresponding thereto, and it is possible to determine whether or not a passenger is seated on each seat by combining the two-dimensional spectrum matrix.
In step 305, passenger seating state data is generated based on the passenger seating state.
In the embodiment of the application, after the millimeter wave radar determines the passenger seating state of each seat, the seating states are summarized, and passenger seating state data is generated. The passenger seating state data indicates a situation in which all seats in the vehicle are seated by the passenger.
And step 306, transmitting the passenger riding state data to the vehicle MCU.
The process is a process that the millimeter wave radar transmits the passenger riding state data to the vehicle MCU, and the vehicle MCU performs subsequent signal control.
In summary, the method provided by the embodiment of the application combines the characteristic of a large detection range of the millimeter wave radar and the functions of identifying and receiving signals of a heating object, judges the riding state of a passenger by combining the division condition and thermodynamic information of the interior of the vehicle after acquiring the two-dimensional frequency spectrum matrix of the interior of the vehicle, feeds back the detection result to the vehicle MCU based on the riding state, and distinguishes the human body and the object by utilizing the identification capability of the millimeter wave radar on the micro-motion target and the heat dissipation target and distinguishes the position, so that the false alarm rate of the safety belt reminding is reduced, and the use stability when the safety belt wearing reminding is improved.
Fig. 4 shows a flowchart of another millimeter wave radar-based in-vehicle seat belt wear reminding method according to an exemplary embodiment of the present application, which is described by taking the method as an example for being applied to a millimeter wave radar, and the method includes:
in step 401, the millimeter wave radar determines the relative position of the seat based on the type of the vehicle and its own position.
In step 402, the millimeter wave radar generates seat area division data based on the relative position of the seat.
The process from step 401 to step 402 is a process in which the relative position of the seat and the seat area division condition are determined after the millimeter wave radar determines its own position. Alternatively, the millimeter wave radar determines each as a relative positional relationship with itself, and generates seat region division data, by means of transmitting detection probe waves and receiving detection feedback waves, respectively.
In step 403, the millimeter wave radar transmits the detection signal and receives the feedback signal.
The process is the same as step 201 and is not described herein.
And step 404, the millimeter wave radar processes the detection signal and the feedback signal to obtain an intermediate frequency signal.
The process is the same as the process of step 402 and will not be described herein.
And 406, the millimeter wave radar performs static clutter elimination processing on the FFT data.
In step 408, the millimeter wave radar determines at least one seat region spectrum based on the seat region division data on the two-dimensional spectrum matrix.
In the embodiment of the present application, the number of spectrum as a region corresponds to the number as on the vehicle.
Step 409, extracting thermodynamic characteristics from the seat region spectrum by the millimeter wave radar.
Optionally, the thermodynamic characteristic includes at least one of a moving average power energy, an average power ratio, and a regional power correlation coefficient.
And step 410, inputting thermodynamic characteristics into the recognition model by the millimeter wave radar, and outputting to obtain a seat riding state corresponding to the seat area frequency spectrum.
In the embodiment of the application, the recognition model built in the millimeter wave radar can recognize the corresponding seat as the riding state according to the thermodynamic state corresponding to each seat.
Optionally, the thermodynamic characteristic input recognition model is a model constructed based on sample training. In the training process, the millimeter wave radar acquires a sample two-dimensional frequency spectrum matrix, and the sample two-dimensional frequency spectrum matrix is marked with passenger riding results. And adjusting characteristic parameters in the model through the sample two-dimensional frequency spectrum matrix to obtain the identification model with high accuracy.
In one example of the present application, the millimeter wave radar determines the extracted thermodynamic feature value and also determines the seat occupancy state based on the seat region spectrum. When the seat occupancy state is determined, the millimeter wave radar can determine whether an object exists on the seat only according to the distance data and the position data of the target. When no object exists on the seat, thermodynamic feature extraction is not performed, and the calculation amount in the judgment process is reduced.
And step 411, summarizing the seating state of the seat by the millimeter wave radar to obtain the seating state data of the passenger.
In an embodiment of the present application, a representation of passenger seating state data is provided. Alternatively, in the passenger seating state data, "0" indicates that no passenger is present in the seat, and "1" indicates that a passenger is present in the seat. In one example, five data digits are provided for five cars and an index table is built, as shown in table 1 below:
table 1: data format table for passenger riding state
| Index | Binary representation | Index | Binary representation |
| 0 | (0,0,0,0,0) | 16 | (1,0,0,0,0) |
| 1 | (0,0,0,0,1) | 17 | (1,0,0,0,1) |
| 2 | (0,0,0,1,0) | 18 | (1,0,0,1,0) |
| 3 | (0,0,0,1,1) | 19 | (1,0,0,1,1) |
| 4 | (0,0,1,0,0) | 20 | (1,0,1,0,0) |
| 5 | (0,0,1,0,1) | 21 | (1,0,1,0,1) |
| 6 | (0,0,1,1,0) | 22 | (1,0,1,1,0) |
| 7 | (0,0,1,1,1) | 23 | (1,0,1,1,1) |
| 8 | (0,1,0,0,0) | 24 | (1,1,0,0,0) |
| 9 | (0,1,0,0,1) | 25 | (1,1,0,0,1) |
| 10 | (0,1,0,1,0) | 26 | (1,1,0,1,0) |
| 11 | (0,1,0,1,1) | 27 | (1,1,0,1,1) |
| 12 | (0,1,1,0,0) | 28 | (1,1,1,0,0) |
| 13 | (0,1,1,0,1) | 29 | (1,1,1,0,1) |
| 14 | (0,1,1,1,0) | 30 | (1,1,1,1,0) |
| 15 | (0,1,1,1,1) | 31 | (1,1,1,1,1) |
In step 412, the millimeter wave radar transmits the passenger riding status data to the vehicle MCU.
In step 413, the vehicle MCU retrieves the seat belt wearing data in response to receiving the passenger seating state data.
In the embodiment of the present application, the seat belt wearing data indicates the current wearing condition of the seat belt.
And step 414, the vehicle MCU generates a safety belt wearing prompt signal according to the passenger riding state data and the safety belt wearing data.
The safety belt prompting signal is a signal for prompting a passenger to wear the safety belt.
Step 415, the vehicle MCU sends the belt wearing prompt signal to the belt wearing reminding device.
In this embodiment of the application, the vehicle MCU may further determine a vehicle state and determine whether to send the belt wearing alert signal, for example, when the driver is not present in the main driver seat or the vehicle is in the parking position and the vehicle is stationary, the belt wearing alert signal is not sent.
And step 417, the safety belt wearing reminding device carries out safety belt wearing reminding based on the safety belt wearing reminding signal.
Optionally, based on the type of the seat belt wearing device, a corresponding message prompt may be performed. In one example, the seat belt-wearing device is implemented as a light emitting alarm; in another example, the belt-worn device is implemented as a buzzer.
In summary, the method provided by the embodiment of the application combines the characteristic of a large detection range of the millimeter wave radar and the functions of identifying and receiving signals of a heating object, judges the riding state of a passenger by combining the division condition and thermodynamic information of the interior of the vehicle after acquiring the two-dimensional frequency spectrum matrix of the interior of the vehicle, feeds back the detection result to the vehicle MCU based on the riding state, and distinguishes the human body and the object by utilizing the identification capability of the millimeter wave radar on the micro-motion target and the heat dissipation target and distinguishes the position, so that the false alarm rate of the safety belt reminding is reduced, and the use stability when the safety belt wearing reminding is improved.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The in-vehicle safety belt wearing reminding system based on the millimeter wave radar is characterized by comprising the millimeter wave radar, a vehicle micro-control unit (MCU) and safety belt wearing reminding equipment, wherein the millimeter wave radar is in communication connection with the vehicle MCU, and the vehicle micro-control unit is in communication connection with the safety belt wearing reminding equipment;
the millimeter wave radar is used for sending detection signals and receiving feedback signals; performing signal processing on the detection signal and the feedback signal to obtain an intermediate frequency signal; performing signal processing on the intermediate frequency signal to obtain a distance-angle two-dimensional frequency spectrum matrix, wherein the distance-angle two-dimensional frequency spectrum matrix is used for representing the thermal state in the vehicle; calling prestored seat area dividing data, and determining the passenger riding state by combining the two-dimensional frequency spectrum matrix, wherein the seat area dividing data is used for indicating the distribution condition of seats in the vehicle; generating passenger riding state data according to the passenger riding state; transmitting the passenger riding state data to the vehicle MCU;
the vehicle MCU is used for receiving the passenger riding state data; generating a seat belt wearing prompt signal based on the passenger riding state data; sending the safety belt wearing prompt signal to safety belt wearing prompt equipment;
the safety belt wearing reminding device is used for receiving the safety belt wearing reminding signal; and carrying out safety belt wearing prompt based on the safety belt wearing prompt signal.
2. The in-vehicle seatbelt wearing alert system according to claim 1,
the millimeter wave radar is also used for carrying out Fast Fourier Transform (FFT) processing on the intermediate frequency signal based on the distance dimension to obtain one-dimensional FFT data based on the distance dimension; and generating a distance-angle two-dimensional frequency spectrum matrix based on a distance dimension and an angle dimension by combining a high-resolution digital beam forming DBF angle measurement method according to the one-dimensional FFT data.
3. The in-vehicle seatbelt wearing alert system according to claim 2,
the millimeter wave radar is also used for eliminating static clutter from the FFT data.
4. The in-vehicle safety wear reminder system of claim 1,
the millimeter wave radar is further used for determining the relative position of the seat based on the type of the vehicle and the position of the seat before sending the detection signal and receiving the feedback signal; generating the seating region division data based on the seat relative position.
5. The in-vehicle seatbelt wearing alert system according to claim 1,
the millimeter wave radar further configured to determine at least one seat region spectrum on the two-dimensional spectrum matrix based on the seat region division data, the number of seat region spectra corresponding to the number of seats on the vehicle; extracting thermodynamic features from the seating region spectrum, the thermodynamic features including at least one of moving average power energy, average power ratio, and region power correlation coefficient; inputting the thermodynamic characteristics into an identification model, and outputting to obtain a seat riding state corresponding to the seat region frequency spectrum; and summarizing the seat riding state data according to the seat riding state.
6. The in-vehicle seatbelt wearing alert system according to claim 5,
the millimeter wave radar is also used for establishing a recognition model; obtaining a sample two-dimensional frequency spectrum matrix, wherein the sample two-dimensional frequency spectrum matrix is marked with passenger riding results; and training the recognition model based on the sample two-dimensional frequency spectrum matrix.
7. The in-vehicle seatbelt wearing alert system according to claim 5,
the millimeter wave radar is further used for determining a seat occupancy state based on the seat area spectrum; extracting thermodynamic features from the seat region spectrum in response to the seat region spectrum determining that the seat occupancy state is occupied.
8. The in-vehicle seatbelt wearing alert system according to claim 1,
the vehicle MCU is further used for responding to the received passenger riding state data and acquiring safety belt wearing data, and the safety belt wearing data indicates the current safety belt wearing condition; and generating the safety belt wearing prompt signal according to the passenger riding state data and the safety belt wearing data.
9. The in-vehicle seat belt wearing reminder according to claim 1, wherein the seat belt wearing reminder device is implemented as at least one of a luminous alarm and a buzzer.
10. An in-vehicle seat belt wearing reminding method based on millimeter wave radar, which is applied to the millimeter wave radar of the in-vehicle seat belt wearing reminding system based on the millimeter wave radar of any one of claims 1 to 9, the method comprising:
sending a detection signal and receiving a feedback signal;
performing signal processing on the detection signal and the feedback signal to obtain an intermediate frequency signal;
performing signal processing on the intermediate-frequency signal to obtain a distance-angle two-dimensional frequency spectrum matrix, wherein the distance-angle two-dimensional frequency spectrum matrix is used for representing the thermal state in the vehicle;
calling prestored seat area dividing data, and determining the passenger riding state by combining the two-dimensional frequency spectrum matrix, wherein the seat area dividing data is used for indicating the distribution condition of seats in the vehicle;
generating passenger riding state data according to the passenger riding state;
and sending the passenger riding state data to a vehicle MCU.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115826062A (en) * | 2022-11-22 | 2023-03-21 | 广东分数维无线科技有限公司 | Organism identification system and method based on millimeter wave radar |
| CN117908141A (en) * | 2024-03-19 | 2024-04-19 | 成都鹰谷米特科技有限公司 | Target determining method based on dual-band millimeter wave integration and proximity fuse |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115826062A (en) * | 2022-11-22 | 2023-03-21 | 广东分数维无线科技有限公司 | Organism identification system and method based on millimeter wave radar |
| CN117908141A (en) * | 2024-03-19 | 2024-04-19 | 成都鹰谷米特科技有限公司 | Target determining method based on dual-band millimeter wave integration and proximity fuse |
| CN117908141B (en) * | 2024-03-19 | 2024-05-14 | 成都鹰谷米特科技有限公司 | Target determining method based on dual-band millimeter wave integration and proximity fuse |
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