Vehicle equipment sharing and receiving system and method based on Bluetooth technology

Abstract

The invention belongs to the technical field of Bluetooth, and particularly relates to a vehicle equipment sharing and receiving system and method based on the Bluetooth technology, and the method comprises the steps: capturing the intensity characteristics and multipath reflection characteristics of a Bluetooth handshake signal between a user side and a vehicle-mounted side when the user side triggers unlocking for the first time, deeply analyzing the superposed effect of vehicle body metal penetration loss and in-vehicle metal reflection, and obtaining the vehicle equipment sharing and receiving effect. The method comprises the following steps of: quantifying the attenuation degree of a vehicle-mounted metal environment on a Bluetooth signal, judging a Bluetooth signal link enhancement operation execution requirement and performing corresponding link compensation, and then performing state perception and congestion feature classification on a Bluetooth communication full-channel space; and allocating an exclusive communication window for the bidirectional authentication of the user side and the vehicle-mounted side according to the channel congestion feature type, and requiring the user side and the vehicle-mounted side to execute encrypted bidirectional authentication in the exclusive communication window, thereby ensuring the stability and high efficiency of the bidirectional authentication process between the user side and the vehicle-mounted side. And the reliability of vehicle unlocking based on Bluetooth communication is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the field of Bluetooth technology, and specifically relates to a vehicle device sharing receiving system and method based on Bluetooth technology. Background Art

[0002] The vehicle device sharing system realizes the remote access and permission sharing of modules such as in-vehicle infotainment devices, diagnostic interfaces, door lock controls, and power systems through the characteristics of Bluetooth low energy and short-distance communication. This system is particularly suitable for the interaction between user terminals such as mobile phone keys and in-vehicle terminals. Through Bluetooth pairing, functions such as vehicle unlocking, engine starting, and digital key sharing can be completed. However, considering that the stability and security of Bluetooth communication directly affect the user experience, designing a reasonable Bluetooth interaction mechanism plays a key role in improving the practicability and security of the entire system.

[0003] In the prior art, there are also some solutions related to vehicle unlocking based on Bluetooth communication. For example, a vehicle unlocking method, terminal, and storage medium with the Chinese patent publication number CN113068160B establish a communication connection between the first Bluetooth module of the terminal and the second Bluetooth module of the vehicle, detect the received signal strength indication (RSSI) value between the first Bluetooth module and the second Bluetooth module, and compare it with the unlocking threshold. When the threshold is reached, an unlocking instruction is sent.

[0004] Another Chinese patent publication number CN118741686A for a digital key Bluetooth positioning, device, equipment, and storage medium receives the signal strength between the digital key Bluetooth and the vehicle Bluetooth module, determines whether the digital key Bluetooth is in the vehicle's unlocking area based on the first model and the signal strength, and when the digital key Bluetooth is in the unlocking area, determines the azimuth of the unlocking area of the digital key Bluetooth according to the second model and the signal strength, improving the accuracy of digital key Bluetooth positioning.

[0005] Although the above two solutions involve solutions related to vehicle unlocking based on Bluetooth communication, the prior art still has the following limitations: Specifically, 1. The prior art ignores the problem of Bluetooth signal attenuation and instability caused by the vehicle's metal environment. The vehicle's metal structure may not only cause signal attenuation due to body penetration but also lead to a significant multipath effect of Bluetooth signals, and conventional signal strength detection easily increases the interaction positioning error between the vehicle terminal and the user terminal.

[0006] 2. The prior art lacks effective management of channel interference in a dense Bluetooth environment. In a high-density Bluetooth scenario, fixed channel allocation easily causes congestion interference, and the prior art lacks an adaptive channel adjustment and allocation mechanism, which easily results in insufficient Bluetooth communication stability between the vehicle terminal and the user terminal. Summary of the Invention

[0007] To overcome the disadvantages in the background art, an embodiment of the present invention provides a vehicle device sharing receiving system and method based on Bluetooth technology, which can effectively solve the problems involved in the above-mentioned background art.

[0008] The technical solution adopted by the present invention to solve its technical problems is as follows: In the first aspect, the present invention provides a vehicle device sharing receiving system based on Bluetooth technology, including: a signal sensing module, an attenuation judgment module, a link compensation module, a channel monitoring module, and a security authentication module.

[0009] The signal sensing module is connected to the attenuation judgment module, the attenuation judgment module is respectively connected to the link compensation module and the channel monitoring module, the link compensation module is connected to the channel monitoring module, and the channel monitoring module is connected to the security authentication module.

[0010] The signal sensing module captures the Bluetooth signal strength characteristics and multipath reflection characteristics through the Bluetooth handshake signal between the user terminal and the vehicle-mounted terminal when the user terminal triggers unlocking for the first time.

[0011] The attenuation judgment module quantifies the attenuation degree of the Bluetooth signal by the vehicle-mounted metal environment based on the characteristic data, and judges whether to perform the Bluetooth signal link enhancement operation. If so, it jumps to the link compensation module, otherwise it jumps to the channel monitoring module.

[0012] The link compensation module performs attenuation compensation on the Bluetooth signal link, which includes uplink transmit power compensation and downlink directional beam enhancement.

[0013] The channel monitoring module perceives the state of the entire Bluetooth communication channel space and classifies the congestion characteristics, and allocates an exclusive communication window for the two-way authentication between the user terminal and the vehicle-mounted terminal according to the channel congestion characteristic type.

[0014] The security authentication module performs encrypted two-way authentication in the exclusive communication window. If the authentication is successful, it outputs a vehicle unlocking instruction to the body control unit. If the authentication fails, it notifies the user terminal that the unlocking fails.

[0015] In the second aspect, the present invention provides a vehicle device sharing receiving method based on Bluetooth technology, including: S1. Capturing the Bluetooth signal strength characteristics and multipath reflection characteristics through the Bluetooth handshake signal between the user terminal and the vehicle-mounted terminal when the user terminal triggers unlocking for the first time.

[0016] S2. Quantifying the attenuation degree of the Bluetooth signal by the vehicle-mounted metal environment based on the characteristic data, and judging whether to perform the Bluetooth signal link enhancement operation. If so, it jumps to step S3, otherwise it jumps to step S4.

[0017] S3. Performing attenuation compensation on the Bluetooth signal link, which includes uplink transmit power compensation and downlink directional beam enhancement.

[0018] S4. Perform state awareness and congestion feature classification on the entire Bluetooth communication channel space, and allocate an exclusive communication window for the two-way authentication between the user terminal and the vehicle terminal according to the channel congestion feature type.

[0019] S5. Perform encrypted two-way authentication within the exclusive communication window. If the authentication is successful, output a vehicle unlocking command to the body control unit; if the authentication fails, notify the user terminal that the unlocking fails.

[0020] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: (1) The present invention takes into account the interference of metal penetration through the vehicle body and the reflection of metal inside the vehicle. Through the Bluetooth handshake signal when the user terminal triggers unlocking for the first time, it accurately quantifies the attenuation degree of the Bluetooth signal by the in-vehicle metal environment, determines the need to perform Bluetooth signal link enhancement operations and performs corresponding link compensation to ensure the stable transmission of the Bluetooth signal, avoid unlocking delays or failures caused by signal attenuation, and greatly improve the user experience.

[0021] (2) The present invention realizes the state awareness of the entire Bluetooth communication channel space. According to the classification result of the channel congestion features, it allocates an exclusive communication window for the two-way authentication between the user terminal and the vehicle terminal, avoiding interference and competition from other channels, ensuring the stability and efficiency of the two-way authentication process between the user terminal and the vehicle terminal, and greatly improving the reliability and stability of communication. Description of the Drawings

[0022] The present invention is further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the following drawings without creative efforts.

[0023] Figure 1 It is a module connection block diagram of a vehicle device sharing receiving system based on Bluetooth technology provided by the first embodiment of the present invention.

[0024] Figure 2 It is a step flow chart of a vehicle device sharing receiving method based on Bluetooth technology provided by the second embodiment of the present invention.

[0025] Figure 3 It is a hierarchical flow chart of the vehicle unlocking Bluetooth communication protocol between the user terminal and the vehicle terminal of the present invention. Detailed Embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1

[0028] Please refer to Figure 1 As shown, in the first embodiment of the present invention, a vehicle device sharing receiving system based on Bluetooth technology is provided, including: a signal sensing module, an attenuation decision module, a link compensation module, a channel monitoring module, and a security authentication module.

[0029] The signal sensing module is connected to the attenuation decision module, the attenuation decision module is respectively connected to the link compensation module and the channel monitoring module, the link compensation module is connected to the channel monitoring module, and the channel monitoring module is connected to the security authentication module.

[0030] The signal sensing module captures the Bluetooth signal strength characteristics and multipath reflection characteristics through the Bluetooth handshake signal between the user terminal and the vehicle terminal when the user terminal triggers unlocking for the first time.

[0031] In a preferred embodiment of the present invention, the Bluetooth handshake signal includes a broadcast data packet sent by the user terminal to the vehicle terminal in the uplink, and a response data packet sent by the vehicle terminal to the user terminal in response to the broadcast data packet in the downlink.

[0032] In a preferred embodiment of the present invention, capturing the Bluetooth signal strength characteristics includes: extracting the received signal strength indication value synchronously measured when the vehicle terminal receives the broadcast data packet, calculating the signal path loss amount including the distance transmission loss component and the metal penetration loss component based on the received signal strength indication value, and using this as the Bluetooth signal strength characteristic.

[0033] It should be noted that the above signal path loss amount is the difference between the preset initial transmission power of the user terminal and the received signal strength indication value.

[0034] The specific decomposition process of the signal path loss amount is: taking half of the product of the round-trip duration of the Bluetooth handshake signal and the preset propagation speed of the Bluetooth handshake signal as the position distance of the current user terminal relative to the vehicle terminal, substituting the position distance into the free space path loss formula to obtain the distance transmission loss component of the broadcast data packet sent by the user terminal to the vehicle terminal in the uplink, and then taking the difference between the signal path loss amount and the distance transmission loss component as the metal penetration loss component, where the free space path loss formula can be exemplified as , respectively represent the position distance of the current user terminal relative to the vehicle terminal and the preset frequency of the Bluetooth handshake signal.

[0035] In a preferred embodiment of the present invention, capturing the multipath reflection characteristics includes: when the user terminal receives the response data packet, obtaining the delay, phase, and amplitude parameters of the multipath reflection signal through channel impulse response analysis.

[0036] Screen the direct path signal and each metal reflection path signal in the multipath reflection signal according to the preset path peak rule.

[0037] It should be noted that the content of the above preset path peak rule includes: screening the signal with the smallest time delay value and the largest amplitude in the multipath reflection signal as the direct path signal.

[0038] Regard the signal in the multipath reflection signal whose time delay value is in the invalid time delay interval or the amplitude is lower than the preset noise tolerance threshold as the environmental noise interference signal and eliminate it, and regard the remaining multipath reflection signals after elimination as the metal reflection path signals.

[0039] Calculate the phase difference and time delay difference between each metal reflection path signal and the direct path signal, and use the phase difference and the time delay difference as row elements to construct the phase difference matrix of the metal reflection path.

[0040] Quantify the maximum time delay difference and the root mean square of the time delay spread of the metal reflection path signal relative to the direct path signal, and jointly use the singular value decomposition result of the phase difference matrix as the multipath reflection feature.

[0041] The attenuation decision module quantifies the attenuation degree of the in-vehicle metal environment to the Bluetooth signal based on the feature data, and judges whether to perform the Bluetooth signal link enhancement operation. If so, jump to the link compensation module, otherwise jump to the channel monitoring module.

[0042] In a preferred embodiment of the present invention, the judgment of whether to perform the Bluetooth signal link enhancement operation includes: pre-calibrating the reference threshold of the metal penetration loss component at the in-vehicle end and the reference numerical values of each parameter of the multipath reflection feature according to the vehicle model.

[0043] It should be noted that the above pre-calibration process is obtained through a standardized channel measurement experiment established in the system development stage. The specific calibration process includes the following key contents: constructing a typical sample library covering each mainstream vehicle model, establishing a double test scenario in a microwave anechoic chamber and a real road environment, using a vector network analyzer and a channel sounder for multi-band measurement, and thus carrying out the in-vehicle and out-of-vehicle path loss experiments, calibrating the metal penetration loss threshold and the threshold of each parameter of the multipath reflection feature that each vehicle model can tolerate at the stable edge state of the Bluetooth communication signal, and using this as a reference or benchmark.

[0044] Use the ratio of the metal penetration loss component in the Bluetooth signal strength feature to its calibrated reference threshold as the attenuation degree of the vehicle body metal environment to the Bluetooth signal.

[0045] Normalize each parameter in the currently captured multipath reflection feature with its corresponding calibrated reference numerical value, and use the accumulated result of the normalization process as the attenuation degree of the in-vehicle metal environment to the Bluetooth signal.

[0046] It should be noted that each parameter in the above multipath reflection characteristics can be used as the basis for analyzing the attenuation degree of Bluetooth signals in the in-vehicle metal environment. Its core logic stems from the physical correlation between the multipath propagation theory and the signal statistical characteristics. Among them, the maximum delay difference and the root mean square of the delay spread mainly characterize the multipath complexity from the time dimension. The more intense the metal reflection, the larger the values of the two, and the more significant the attenuation of the signal due to ISI and frequency-selective fading. The singular value decomposition result of the phase difference matrix reflects the multipath energy distribution from the spatial dimension. The metal environment flattens the singular value distribution by increasing the number of reflection paths, weakens the spatial filtering ability of the array antenna, and further exacerbates the attenuation.

[0047] By linearly weighted fusion of the attenuation degrees of Bluetooth signals by the vehicle body and the in-vehicle metal environment, the attenuation degree of the in-vehicle metal environment on Bluetooth signals is quantified. If the attenuation degree is greater than or equal to the preset warning threshold of the Bluetooth signal attenuation degree, it is determined to execute the Bluetooth signal link enhancement operation, otherwise it is determined not to execute.

[0048] The link compensation module compensates for the attenuation of the Bluetooth signal link, which includes uplink transmission power compensation and downlink directional beam enhancement.

[0049] In a preferred embodiment of the present invention, the uplink transmission power compensation includes: extracting the transmission power compensation value mapped by the attenuation degree of the in-vehicle metal environment on the Bluetooth signal according to the preset mapping table of body attenuation degree - transmission power compensation stored in the cloud database.

[0050] Taking the ratio of the distance transmission loss component in the Bluetooth signal strength characteristic to the Bluetooth signal transmission distance as the transmission power transmission loss index, and multiplying the transmission power transmission loss index by the transmission power compensation value, and then adding it to the transmission power compensation value again to obtain the actual uplink transmission power compensation value.

[0051] In a preferred embodiment of the present invention, the downlink directional beam enhancement includes: screening the signal of the metal reflection path corresponding to the maximum singular value in the singular value decomposition result of the phase difference matrix as the main reflection signal, and analyzing the azimuth angle of the user end relative to the vehicle end based on the phase difference between the main reflection signal and the direct path signal, so as to determine the pointing direction of the main lobe of the beamforming.

[0052] The vehicle-mounted integrated antenna array generates a weighted coefficient vector for each element according to the azimuth angle, adjusts the phase and amplitude of the radio frequency signal, and forms a downlink directional enhancement beam.

[0053] In the embodiments of the present invention, the metal penetration interference of the vehicle body and the metal reflection interference inside the vehicle are taken into consideration. Through the Bluetooth handshake signal when the user first triggers unlocking, the attenuation degree of the Bluetooth signal by the in-vehicle metal environment is accurately quantified, the execution requirement of the Bluetooth signal link enhancement operation is judged, and the corresponding link compensation is performed to ensure the stable transmission of the Bluetooth signal, avoid unlocking delay or failure caused by signal attenuation, and greatly improve the user experience.

[0054] The channel monitoring module performs state perception and congestion feature classification on the entire Bluetooth communication channel space, and allocates an exclusive communication window for the mutual authentication between the user terminal and the vehicle terminal according to the type of channel congestion feature.

[0055] In a preferred embodiment of the present invention, the state perception and congestion feature classification of the entire Bluetooth communication channel space includes: performing a full-band scan on the entire Bluetooth communication channel space, measuring the signal energy, occupancy duration ratio, and packet collision rate of each channel according to a preset resolution, and determining the divided congestion channel types corresponding to the signal energy, occupancy duration ratio, and packet collision rate stored in the cloud database according to the preset numerical intervals, determining the divided congestion channel types involved in the measurement parameters of each channel, screening the divided congestion channel type with the highest congestion level as the congestion feature type, so as to determine the congestion feature type of each channel in the Bluetooth communication, where each divided congestion channel type includes low, medium, and high congestion channel types.

[0056] In a preferred embodiment of the present invention, the allocation of an exclusive communication window for the mutual authentication between the user terminal and the vehicle terminal includes: allocating orthogonal time slots for the medium and high congestion channel types, including dividing a fixed-length exclusive window within the mutual authentication period.

[0057] Allocate a fixed channel for the low congestion channel type, including designating an idle channel as the exclusive communication window.

[0058] Pause other Bluetooth data transmissions within the exclusive window, and only allow the interaction of authentication messages between the user terminal and the vehicle terminal.

[0059] The security authentication module performs encrypted mutual authentication within the exclusive communication window. If the authentication is successful, it outputs a vehicle unlocking instruction to the body control unit. If the authentication fails, it notifies the user terminal that the unlocking fails.

[0060] It should be noted that the above-mentioned encrypted mutual authentication includes pre-injecting the same symmetric root key or asymmetric key pair between the vehicle terminal and the user terminal. Based on the temporary random number and the root key, a session key is dynamically generated through a key derivation function. The vehicle terminal sends an authentication challenge containing a timestamp and a random number. The user terminal generates a dynamic signature with the session key and sends it back. After the vehicle terminal verifies the signature, it sends an authentication credential in the reverse direction to complete the mutual authentication of the two parties.

[0061] The embodiments of the present invention achieve the state awareness of the entire channel space of Bluetooth communication. According to the classification results of channel congestion characteristics, exclusive communication windows are allocated for the mutual authentication between the user terminal and the vehicle terminal, avoiding the interference and competition of other channels, ensuring the stability and efficiency of the mutual authentication process between the user terminal and the vehicle terminal, and greatly improving the reliability and stability of communication.

[0062] Embodiment 2

[0063] As Figure 2 shown, in the second embodiment of the present invention, a method for receiving vehicle device sharing based on Bluetooth technology is provided, including: S1. Capturing the Bluetooth signal strength characteristics and multipath reflection characteristics through the Bluetooth handshake signal between the user terminal and the vehicle terminal when the user terminal triggers unlocking for the first time.

[0064] S2. Quantifying the attenuation degree of the Bluetooth signal by the vehicle metal environment based on the feature data, and determining whether to perform the Bluetooth signal link enhancement operation. If so, jump to step S3, otherwise jump to step S4.

[0065] S3. Performing attenuation compensation on the Bluetooth signal link, which includes uplink transmission power compensation and downlink directional beam enhancement.

[0066] S4. Performing state awareness and congestion feature classification on the entire channel space of Bluetooth communication, and allocating an exclusive communication window for the mutual authentication between the user terminal and the vehicle terminal according to the channel congestion feature type.

[0067] S5. Performing encrypted mutual authentication in the exclusive communication window. If the authentication is successful, output a vehicle unlocking instruction to the body control unit. If the authentication fails, notify the user terminal that the unlocking fails.

[0068] As Figure 3 shown, a vehicle device sharing receiving system and method based on Bluetooth technology provided by the present invention can both be implemented based on a hierarchical Bluetooth communication protocol architecture, and its core includes: a physical layer multimode loss separation engine to quantify the attenuation interference of the metal environment, a link layer dynamic resource scheduling to allocate exclusive communication windows, and an application layer device sharing cooperation protocol to trigger encrypted mutual authentication.

[0069] The above formulas are all dimensionless and take their numerical values for calculation. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0070] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product.

[0071] Those of ordinary skill in the art will realize that the modules and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. A professional technician can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of this application.

[0072] In addition, in each embodiment of this application, the various functional modules can be integrated into one processing module, or each module can exist physically alone, or two or more modules can be integrated into one module.

[0073] As described above, this is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0074] Finally, the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A vehicle device sharing receiving system based on Bluetooth technology, characterized in that, Including: A signal perception module that captures the Bluetooth signal strength characteristics and multipath reflection characteristics through the Bluetooth handshake signal between the user terminal and the vehicle terminal when the user terminal triggers unlocking for the first time; An attenuation judgment module that quantifies the attenuation degree of the vehicle-mounted metal environment on the Bluetooth signal based on the characteristic data, and judges whether to perform Bluetooth signal link enhancement operation. If so, it jumps to the link compensation module, otherwise it jumps to the channel monitoring module; A link compensation module that performs attenuation compensation on the Bluetooth signal link, which includes uplink transmission power compensation and downlink directional beam enhancement; A channel monitoring module that perceives the state of the entire Bluetooth communication channel space and classifies congestion characteristics, and allocates an exclusive communication window for the two-way authentication between the user terminal and the vehicle terminal according to the channel congestion characteristic type; A security authentication module that performs encrypted two-way authentication in the exclusive communication window. If the authentication is successful, it outputs a vehicle unlocking instruction to the body control unit. If the authentication fails, it notifies the user terminal that the unlocking fails.

2. The vehicle device sharing receiving system based on Bluetooth technology according to claim 1, characterized in that: The Bluetooth handshake signal includes a broadcast data packet sent by the user terminal to the vehicle terminal in the uplink, and a response data packet sent by the vehicle terminal to the user terminal in response to the broadcast data packet in the downlink.

3. The vehicle device sharing receiving system based on Bluetooth technology according to claim 2, characterized in that: The capturing of the Bluetooth signal strength characteristics includes: extracting the received signal strength indication value synchronously measured when the vehicle terminal receives the broadcast data packet, calculating the signal path loss amount including the distance transmission loss component and the metal penetration loss component based on the received signal strength indication value, and using this as the Bluetooth signal strength characteristic.

4. The vehicle device sharing receiving system based on Bluetooth technology according to claim 2, characterized in that: Capturing the multipath reflection characteristics includes: when the user terminal receives the response data packet, obtaining the delay, phase and amplitude parameters of the multipath reflection signal through channel impulse response analysis; Sieving the direct path signal and each metal reflection path signal in the multipath reflection signal according to the preset path peak rule; Calculating the phase difference and delay difference between each metal reflection path signal and the direct path signal, and using the phase difference and the delay difference as row elements to construct the phase difference matrix of the metal reflection path; Quantifying the maximum delay difference and the root mean square of the delay spread between the metal reflection path signal and the direct path signal, and combining the singular value decomposition result of the phase difference matrix as the multipath reflection characteristics.

5. The vehicle device sharing receiving system based on Bluetooth technology according to claim 3, characterized in that: The judgment of whether to perform the Bluetooth signal link enhancement operation includes: pre-calibrating the reference threshold of the metal penetration loss component of the vehicle terminal and the reference numerical values of each parameter of the multipath reflection characteristics according to the vehicle model; Taking the ratio of the metal penetration loss component in the Bluetooth signal strength characteristics to its calibrated reference threshold as the attenuation degree of the vehicle body metal environment on the Bluetooth signal; Normalizing each parameter in the currently captured multipath reflection characteristics with its corresponding calibrated reference numerical value, and taking the accumulated result of the normalization process as the attenuation degree of the in-vehicle metal environment on the Bluetooth signal; Quantifying the attenuation degree of the vehicle-mounted metal environment on the Bluetooth signal through the linear weighted fusion of the attenuation degrees of the vehicle body and the in-vehicle metal environment on the Bluetooth signal. If the attenuation degree is greater than or equal to the preset Bluetooth signal attenuation degree warning threshold, it is judged to perform the Bluetooth signal link enhancement operation, otherwise it is judged not to perform.

6. The vehicle device sharing receiving system based on Bluetooth technology according to claim 5, characterized in that: The uplink transmission power compensation includes: extracting the transmission power compensation value mapped by the attenuation degree of the vehicle body metal environment on the Bluetooth signal according to the preset mapping table of vehicle body attenuation degree - transmission power compensation stored in the cloud database; Taking the ratio of the distance transmission loss component in the Bluetooth signal strength feature to the Bluetooth signal transmission distance as the transmission power transmission loss index, and multiplying the transmission power transmission loss index by the transmission power compensation value, and then superimposing it on the transmission power compensation value again to obtain the actual uplink transmission power compensation value.

7. The vehicle device sharing receiving system based on Bluetooth technology according to claim 4, wherein: The downlink directional beam enhancement includes: screening the signal of the metal reflection path corresponding to the largest singular value in the singular value decomposition result of the phase difference matrix as the main reflection signal, and analyzing the azimuth angle of the user end relative to the vehicle-mounted end based on the phase difference between the main reflection signal and the direct path signal, so as to determine the pointing direction of the main lobe of beamforming; The vehicle-mounted integrated antenna array generates the weighted coefficient vector of each element according to the azimuth angle, adjusts the phase and amplitude of the radio frequency signal, and forms a downlink directional enhancement beam.

8. The vehicle device sharing receiving system based on Bluetooth technology according to claim 1, characterized in that: The state perception and congestion feature classification of the entire Bluetooth communication channel space includes: performing a full-band scan on the entire Bluetooth communication channel space, measuring the signal energy, occupancy duration ratio, and packet collision rate of each channel according to the preset resolution, and determining the divided congestion channel types involved in the measurement parameters of each channel according to the preset numerical intervals of signal energy, occupancy duration ratio, and packet collision rate corresponding to each divided congestion channel type stored in the cloud database, screening the divided congestion channel type with the highest congestion level as the congestion feature type, so as to determine the congestion feature type of each channel in Bluetooth communication, where each divided congestion channel type includes low, medium, and high congestion channel types.

9. The vehicle device sharing receiving system based on Bluetooth technology according to claim 8, characterized in that: The exclusive communication window allocated for the mutual authentication between the user end and the vehicle-mounted end includes: allocating orthogonal time slots for medium and high congestion channel types, including dividing a fixed-length exclusive window within the mutual authentication period; Allocating a fixed channel for low congestion channel types, including designating an idle channel as an exclusive communication window; Suspending other Bluetooth data transmissions within the exclusive window, and only allowing the exchange of authentication messages between the user end and the vehicle-mounted end.

10. A vehicle device sharing receiving method based on Bluetooth technology, characterized in that, Including: S1. Capturing the Bluetooth signal strength feature and multipath reflection feature through the Bluetooth handshake signal between the user end and the vehicle-mounted end when the user end first triggers unlocking; S2. Quantifying the attenuation degree of the vehicle-mounted metal environment on the Bluetooth signal based on the feature data, and determining whether to perform the Bluetooth signal link enhancement operation. If so, jump to step S3, otherwise jump to step S4; S3. Performing attenuation compensation on the Bluetooth signal link, which includes uplink transmission power compensation and downlink directional beam enhancement; S4. Performing state perception and congestion feature classification on the entire Bluetooth communication channel space, and allocating an exclusive communication window for the mutual authentication between the user end and the vehicle-mounted end according to the channel congestion feature type; S5. Performing encrypted mutual authentication within the exclusive communication window. If the authentication is successful, output a vehicle unlocking instruction to the body control unit. If the authentication fails, notify the user end that the unlocking fails.

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