A pairing method for tire pressure sensors for anti-interference in vehicle production line

Abstract

The present invention relates to the field of wireless communication technology, and discloses a pairing method for tire pressure sensors for anti-interference of a vehicle production line, comprising the following steps: S101, sending a low-frequency instruction to a tire pressure sensor to be paired through a low-frequency trigger; S102, after receiving the low-frequency instruction, the tire pressure sensor generates unique authentication data, and feeds it back to the low-frequency trigger through a high-frequency signal; S103, the low-frequency trigger extracts signal features, determines the validity and rolling code matching, and then enters secondary authentication; generates authentication response data through a secondary random challenge code, and verifies it; if the verification passes, it is determined that the match is successful; S104, writes the verified tire pressure sensor identification data into the tire pressure detection control unit, and performs a secondary consistency check; S105, the tire pressure detection control unit compares the high-frequency analog signal and the tire pressure sensor identification data, and confirms the pairing if the results are consistent. The present invention realizes high-reliability automatic pairing in a production line environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless communications, and in particular relates to a pairing method of tire pressure sensors for anti-interference of a vehicle production line. Background Art

[0002] With the continuous development of intelligent automobile manufacturing and electronic integration technology, tire pressure monitoring systems have become an important part of vehicle safety and are widely used on production lines. Traditional tire pressure sensor pairing methods usually rely on low-frequency triggering and high-frequency data transmission, where low-frequency signals are used to activate sensors and transmit fixed or preset rolling codes, and high-frequency signals are responsible for sensor data feedback and identification code transmission. However, in actual production environments, due to the presence of a large amount of radio interference and electromagnetic noise, low-frequency signals are susceptible to interference, and fixed rolling codes are difficult to effectively distinguish sensors in different areas on high-density production lines, resulting in pairing errors or repeated pairing, which seriously affects the assembly quality of the vehicle and subsequent operational safety. At the same time, the existing technology has deficiencies in signal strength adaptive adjustment, two-way authentication, and data integrity verification, and cannot meet the requirements of modern vehicles for high-precision and high-reliability pairing methods. Summary of the invention

[0003] The present invention provides a pairing method for tire pressure sensors for anti-interference of a vehicle production line, which solves the technical problems in the related technology that are insufficient in anti-interference capability, signal discrimination, adaptive adjustment, two-way authentication and data integrity verification, and easily lead to pairing errors or repeated pairing.

[0004] The present invention provides a pairing method of tire pressure sensors for anti-interference of a vehicle production line, comprising the following steps:

[0005] S101, sending a low-frequency instruction to the tire pressure sensor to be paired through a low-frequency trigger, wherein the low-frequency instruction includes a rolling code, a random challenge code and a timestamp synchronously generated according to the unique number of the production line and the first preset time window, and the random challenge code represents a random number generated by the low-frequency trigger;

[0006] S102, after receiving the low-frequency command, the tire pressure sensor generates unique authentication data based on the built-in security chip and the physical unclonable function calculation, and feeds back the unique authentication data to the low-frequency trigger through a high-frequency signal;

[0007] S103, after the low-frequency trigger receives the high-frequency signal of the tire pressure sensor, the signal feature is extracted, and the high-frequency signal is determined to meet the validity requirement based on the signal feature threshold. When the high-frequency signal meets the validity requirement and the rolling code is matched successfully, it is determined that the sensor is in the target pairing area and enters the secondary authentication stage;

[0008] In the secondary authentication stage, the low-frequency trigger sends a secondary random challenge code to the tire pressure sensor. After receiving it, the tire pressure sensor performs decryption calculation and generates authentication response data, which is fed back to the low-frequency trigger through a high-frequency signal. After receiving the authentication data, the low-frequency trigger parses and verifies the consistency of the rolling code, the validity of the PUF identifier and the timestamp in turn. When all the checks are passed, the tire pressure sensor is determined to be matched successfully, otherwise the pairing is rejected.

[0009] S104, after determining that the tire pressure sensor is successfully matched, the low-frequency trigger writes the verified tire pressure sensor identification data into the tire pressure detection control unit through the on-board diagnostic system interface and performs a secondary consistency check;

[0010] S105, the low-frequency trigger simulates the high-frequency signal of the tire pressure sensor through the high-frequency transmitter, and the tire pressure detection control unit compares the high-frequency simulation signal with the tire pressure sensor identification data after the secondary consistency check is successful. If the results are consistent, the pairing is confirmed, otherwise the response measures are automatically generated.

[0011] Furthermore, a rolling code is generated according to the unique number of the production line and the first preset time window, and each production line corresponds to an independent rolling code. The rolling code is generated in the following manner: ,in, represents the number of the i-th production line, || represents the splicing operation, T represents the first preset time window, and D represents the offset coefficient.

[0012] Furthermore, after receiving the low-frequency command, the tire pressure sensor generates unique authentication data based on the built-in security chip and the physically unclonable function. The specific steps include:

[0013] S201, construct initial authentication data, the calculation formula is: ,in, represents the initial authentication data, R represents the rolling code, and C represents the random challenge code. Indicates the timestamp, Indicates the PUF identifier, which is a fixed identifier generated by the tire pressure sensor when the device leaves the factory. S indicates the sensor status, which includes voltage, current, and temperature.

[0014] S202, performing hash calculation on the initial authentication data;

[0015] S203, when the tire pressure sensor receives the random challenge code, a PUF authentication code is generated using a physical unclonable function;

[0016] S204, combining the PUF authentication code with the initial authentication data after hash calculation, and performing symmetric encryption to construct unique authentication data.

[0017] Furthermore, the signal characteristics include: signal strength, signal propagation time, signal-to-noise ratio and frequency offset, and the signal characteristic thresholds include: signal strength threshold, signal propagation time threshold, signal-to-noise ratio threshold and frequency offset range threshold.

[0018] Furthermore, the specific steps of extracting signal features include:

[0019] S301, calculating the signal strength by measuring the instantaneous voltage of the high frequency signal;

[0020] S302, determining the signal propagation time by calculating the time delay from the high frequency signal of the tire pressure sensor to the low frequency trigger;

[0021] S303, by calculating the ratio of the received signal power to the background noise power, a signal-to-noise ratio is obtained, wherein the calculation formula of the signal-to-noise ratio is: , SNR stands for signal-to-noise ratio, Indicates the power value of the high-frequency signal emitted by the tire pressure sensor measured at the low-frequency trigger receiving end. It indicates the background noise power value measured by the low-frequency trigger in the no-signal state;

[0022] S304, calculating a frequency offset according to the received high-frequency signal frequency, wherein the frequency offset is calculated as follows: , represents the frequency offset, Indicates the tire pressure sensor signal frequency measured by the low-frequency trigger. Indicates the standard high-frequency signal frequency, that is, the standard high-frequency signal frequency that the tire pressure sensor should emit when working normally.

[0023] Furthermore, when the low-frequency trigger receives the high-frequency signal from the tire pressure sensor, the validity requirements of each signal feature are determined. The validity requirements specifically include:

[0024] Signal strength requirement: The signal strength is greater than the signal strength threshold;

[0025] Signal propagation time requirement: time delay is less than the signal propagation time threshold;

[0026] Signal-to-noise ratio requirement: The signal-to-noise ratio is greater than the signal-to-noise ratio threshold;

[0027] Frequency offset requirement: The absolute value of the frequency offset must be less than the frequency offset range threshold.

[0028] Furthermore, after receiving the secondary random challenge code, the tire pressure sensor performs decryption calculation and generates authentication response data. The specific steps include:

[0029] S401, use the internal security chip to parse the secondary random challenge code, and calculate the authentication data in combination with its own PUF identifier. The calculation formula is: , Represents PUF authentication data, represents a unique response value computed using a physically unclonable function, Indicates the secondary random challenge code;

[0030] S402, calculating the authentication response data according to the rolling code, the PUF identifier, and the timestamp, wherein the authentication response data calculation formula is: , represents the authentication response data, H represents the secure hash function, Represents PUF authentication data, Indicates the authentication timestamp;

[0031] S403, encrypt the authentication response data and return it to the low-frequency trigger through a high-frequency signal.

[0032] Furthermore, the tire pressure sensor identification data includes: a rolling code, a PUF identifier and a timestamp.

[0033] Furthermore, the simulated signal characteristic parameters of the high-frequency signal of the tire pressure sensor simulated by the low-frequency trigger include: rolling code, PUF identifier, timestamp, signal frequency, signal modulation mode, signal strength and data packet format.

[0034] The beneficial effects of the present invention are as follows: the present invention adopts a dynamic rolling code generation mechanism, synchronously generates rolling codes according to the unique number of the production line and the preset time window, and combines the adaptive adjustment of the power and frequency of the low-frequency signal to ensure the uniqueness of the rolling code and reduce the same-frequency interference; in addition, through signal feature extraction and threshold determination, effective signals are screened to avoid radio noise and interference from adjacent production line equipment, thereby improving the recognition accuracy and signal differentiation of the tire pressure sensor, ensuring the pairing reliability, and improving the automation level and pairing stability of the vehicle production line;

[0035] The present invention adopts a random challenge code and timestamp verification mechanism to prevent replay attacks and ensure the uniqueness and validity of the authentication data. The authentication response data is calculated by a secondary random challenge code to ensure that the authentication data of each communication of the tire pressure sensor is different, avoiding malicious copying of old authentication data. In addition, the low-frequency trigger performs rolling code consistency, PUF identification and timestamp comparison on the received authentication data to ensure the integrity of the data returned by the sensor, eliminate the risk of data tampering, and improve the pairing accuracy of the tire pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The present invention is a flow chart of a method for pairing tire pressure sensors for anti-interference in a vehicle production line. DETAILED DESCRIPTION

[0037] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0038] like Figure 1 As shown, a method for pairing tire pressure sensors for anti-interference of a vehicle production line includes the following steps:

[0039] S101, sending a low-frequency instruction to the tire pressure sensor to be paired through a low-frequency trigger, wherein the low-frequency instruction includes a rolling code, a random challenge code and a timestamp synchronously generated according to the unique number of the production line and the first preset time window, and the random challenge code represents a random number generated by the low-frequency trigger; the low-frequency trigger dynamically adjusts the transmission power and frequency of the low-frequency signal according to the environmental noise to ensure that the rolling code is unique and applicable to a specific area of ​​the production line, so as to reduce co-frequency interference and improve signal differentiation;

[0040] S102, after receiving the low-frequency command, the tire pressure sensor generates unique authentication data based on the built-in security chip and the physical unclonable function calculation, and feeds back the unique authentication data to the low-frequency trigger through a high-frequency signal;

[0041] S103, after the low-frequency trigger receives the high-frequency signal of the tire pressure sensor, the signal feature is extracted, and the high-frequency signal is determined to meet the validity requirement based on the signal feature threshold. When the high-frequency signal meets the validity requirement and the rolling code is matched successfully, it is determined that the sensor is in the target pairing area and enters the secondary authentication stage;

[0042] In the secondary authentication stage, the low-frequency trigger sends a secondary random challenge code to the tire pressure sensor. After receiving it, the tire pressure sensor performs decryption calculation and generates authentication response data, which is fed back to the low-frequency trigger through a high-frequency signal. After receiving the authentication data, the low-frequency trigger parses and verifies the consistency of the rolling code, the validity of the PUF identifier and the timestamp in turn. When all the checks are passed, the tire pressure sensor is determined to be matched successfully, otherwise the pairing is rejected.

[0043] S104, after determining that the tire pressure sensor is successfully matched, the low-frequency trigger writes the verified tire pressure sensor identification data into the tire pressure detection control unit through the on-board diagnostic system interface. After receiving the data, the tire pressure detection control unit performs a secondary consistency check, wherein the tire pressure sensor identification data includes: rolling code, PUF identification and timestamp;

[0044] S105, the low-frequency trigger simulates the high-frequency signal of the tire pressure sensor through the high-frequency transmitter, and the tire pressure detection control unit compares the high-frequency simulation signal with the tire pressure sensor identification data after the secondary consistency check is successful. If the results are consistent, the pairing is confirmed, otherwise the response measures are automatically generated.

[0045] In one embodiment of the present invention, the random challenge code refers to a random number generated by a low-frequency trigger in a low-frequency instruction, which is used to perform real-time identity authentication on the tire pressure sensor receiving the instruction. The random challenge code, together with the dynamic rolling code and the timestamp, constitutes the authentication data, requiring the sensor to encrypt the low-frequency instruction using the built-in security module and the preset key after receiving the low-frequency instruction, and generate corresponding response data. By comparing the returned response data, the low-frequency trigger can confirm the true identity of the sensor, thereby preventing replay attacks and signal forgery, and ensuring the uniqueness and security of each authentication session.

[0046] In one embodiment of the present invention, a rolling code is generated according to the unique number of the production line and the first preset time window, and each production line corresponds to an independent rolling code. The rolling code is generated in the following manner: ,in, represents the number of the i-th production line, || represents the splicing operation, T represents the first preset time window, preferably, T is set to 1 hour, and D represents the offset coefficient, which is used to make the distribution of the rolling code more uniform.

[0047] In one embodiment of the present invention, a physically unclonable function is a function that generates a unique and unclonable random response value based on the physical characteristics of the hardware. It can utilize the microscopic physical differences generated in the semiconductor manufacturing process (such as transistor voltage deviation, circuit delay, parasitic capacitance, etc.) to enable each tire pressure sensor to generate a unique and unpredictable response value under the same input challenge code.

[0048] In one embodiment of the present invention, after receiving the low-frequency instruction, the tire pressure sensor generates unique authentication data based on the built-in security chip and the physical unclonable function. The specific steps include:

[0049] S201, construct initial authentication data, the calculation formula is: ,in, represents the initial authentication data, R represents the rolling code, and C represents the random challenge code. Indicates the timestamp, Indicates the PUF identifier, which is a fixed identifier generated by the tire pressure sensor when the device leaves the factory. S indicates the sensor status parameters, which include voltage, current, and temperature.

[0050] S202, performing hash calculation on the initial authentication data;

[0051] S203, when the tire pressure sensor receives the random challenge code, a PUF authentication code is generated using a physical unclonable function;

[0052] S204, combining the PUF authentication code with the initial authentication data after hash calculation, and performing symmetric encryption to construct unique authentication data. Specifically, the rolling code, timestamp and encrypted data are concatenated to obtain unique authentication data.

[0053] In one embodiment of the present invention, the signal characteristics include: signal strength, signal propagation time, signal-to-noise ratio and frequency offset, and the signal characteristic thresholds include: signal strength threshold, signal propagation time threshold, signal-to-noise ratio threshold and frequency offset range threshold.

[0054] In one embodiment of the present invention, the specific steps of extracting signal features include:

[0055] S301, calculating the signal strength by measuring the instantaneous voltage of the high-frequency signal, wherein the calculation formula of the signal strength is: , Indicates signal strength. Represents the instantaneous voltage of the high-frequency signal of the tire pressure sensor at the tth moment, It represents the time window when collecting instantaneous voltage, dt is the time integral, Indicates the standardized received power value, which is used to convert signal strength into dBm units;

[0056] S302, determining the signal propagation time by calculating the time delay of the high-frequency signal of the tire pressure sensor reaching the low-frequency trigger, wherein the calculation formula of the time delay is: , Indicates time delay, Indicates the timestamp of the tire pressure sensor feedback signal received by the low-frequency trigger. Indicates the timestamp when the low-frequency trigger sends the low-frequency signal;

[0057] S303, by calculating the ratio of the received signal power to the background noise power, a signal-to-noise ratio is obtained, wherein the calculation formula of the signal-to-noise ratio is: , SNR stands for signal-to-noise ratio, Indicates the power value of the high-frequency signal emitted by the tire pressure sensor measured at the low-frequency trigger receiving end in a noisy environment Refers only to effective signal power, It indicates the background noise power value measured by the low-frequency trigger in the no-signal state;

[0058] S304, calculating a frequency offset according to the received high-frequency signal frequency, wherein the frequency offset is calculated as follows: , represents the frequency offset, Indicates the tire pressure sensor signal frequency measured by the low-frequency trigger. Indicates the standard high-frequency signal frequency, that is, the standard high-frequency signal frequency that the tire pressure sensor should emit when working normally.

[0059] In one embodiment of the present invention, when the low-frequency trigger receives the high-frequency signal of the tire pressure sensor, the validity requirements are determined for each signal feature, and the validity requirements specifically include:

[0060] Signal strength requirement: The signal strength is greater than the signal strength threshold;

[0061] Signal propagation time requirement: time delay is less than the signal propagation time threshold;

[0062] Signal-to-noise ratio requirement: The signal-to-noise ratio is greater than the signal-to-noise ratio threshold;

[0063] Frequency offset requirement: The absolute value of the frequency offset must be less than the frequency offset range threshold.

[0064] In one embodiment of the present invention, the secondary authentication further verifies the identity authenticity and data integrity of the tire pressure sensor through a challenge-response mechanism to prevent replay attacks, man-in-the-middle attacks and access of counterfeit devices; the challenge-response mechanism includes: generation of a secondary random challenge code, calculation and return of authentication response data, verification mechanism of a low-frequency trigger and other steps.

[0065] In one embodiment of the present invention, after completing high-frequency signal screening, rolling code matching and the high-frequency signal meets the validity requirements, the low-frequency trigger generates a secondary random challenge code, which is used to verify the identity of the tire pressure sensor and ensure the uniqueness of each pairing process. The calculation formula for generating the secondary random challenge code is: ,in, represents a secondary random challenge code, H represents a secure hash function, such as SHA-256, Indicates the random challenge code in the previous low-frequency instruction. Indicates the authentication timestamp.

[0066] In one embodiment of the present invention, after receiving the secondary random challenge code, the tire pressure sensor performs a decryption calculation and generates authentication response data. The specific steps include:

[0067] S401, use the internal security chip to parse the secondary random challenge code, and calculate the authentication data in combination with its own PUF identifier. The calculation formula is: , Represents PUF authentication data, represents a unique response value computed using a physically unclonable function;

[0068] S402, calculating the authentication response data according to the rolling code, the PUF identifier, and the timestamp, wherein the authentication response data calculation formula is: , represents the authentication response data, H represents the secure hash function, Represents PUF authentication data, Indicates the authentication timestamp;

[0069] S403, encrypt the authentication response data and return it to the low-frequency trigger through a high-frequency signal. Specifically, the authentication response data is encrypted using a symmetric encryption algorithm to ensure that the authentication response data is not stolen or tampered with during transmission.

[0070] In one embodiment of the present invention, after receiving the authentication data, the low-frequency trigger uses the stored tire pressure sensor key to decrypt it, obtains the rolling code, PUF identifier and timestamp, and verifies the consistency of the rolling code, the validity of the PUF identifier and the timestamp. Specifically, by verifying whether the current production line target rolling code stored in the low-frequency trigger is consistent with the expected current production line rolling code, it is ensured that the tire pressure sensor is the device of the target production line; by verifying whether the PUF identifier is consistent with the expected PUF authentication code calculated by the physical unclonable function, it is determined whether the tire pressure sensor is a legitimate device; the timestamp verification is used to ensure the timeliness of the authentication data and prevent replay attacks.

[0071] In one embodiment of the present invention, the on-board diagnostic system interface includes: OBD, CAN bus or other communication protocols; the low-frequency trigger stores the verified rolling code, PUF identifier and timestamp into the tire pressure detection control unit through the on-board diagnostic system interface to ensure that the sensor information recorded by the ECU matches the tire pressure sensor currently used by the vehicle; the ECU performs a secondary consistency check to ensure that the data within the system matches to avoid the ECU recording erroneous data, which leads to abnormal tire pressure detection.

[0072] In one embodiment of the present invention, the analog signal characteristic parameters of the high-frequency signal of the tire pressure sensor simulated by the low-frequency trigger include: rolling code, PUF identifier, timestamp, signal frequency, signal modulation method, signal strength and data packet format; wherein, the signal frequency is used to ensure that the analog signal is consistent with the preset frequency band of the tire pressure detection control unit, the signal modulation method is used to match the communication protocol of the tire pressure detection control unit, the signal strength is used to simulate the transmission power characteristics of the real tire pressure sensor, the data packet format is used to simulate the data transmission structure of the real tire pressure sensor, and the signal frequency, signal modulation method, signal strength and data packet format are used to ensure that the sensor recorded by the ECU is not only correctly identified, but also can communicate correctly.

[0073] In one embodiment of the present invention, after the rolling code, PUF identifier and timestamp have successfully passed the secondary consistency check, the low-frequency trigger simulates the high-frequency signals of the four tire pressure sensors through the high-frequency transmitter, and matches the simulated signals with the stored ones through the tire pressure detection control unit. If the comparison is successful, the tire pressure sensors are paired successfully. If the comparison fails, the tire pressure detection control unit automatically generates an abnormal response and can trigger a re-pairing procedure.

[0074] The embodiments of the present invention are described above, but the present invention is not limited to the above-mentioned specific implementation modes. The above-mentioned specific implementation modes are merely illustrative and not restrictive. Under the guidance of the present embodiment, ordinary technicians in this field can also make many forms, which are all within the protection of the present embodiment.

Claims

1. A method for pairing tire pressure sensors for anti-interference in a vehicle production line, characterized in that: The following steps are involved: S101, sending a low-frequency instruction to the tire pressure sensor to be paired through a low-frequency trigger, wherein the low-frequency instruction includes a rolling code, a random challenge code and a timestamp synchronously generated according to the unique number of the production line and the first preset time window, and the random challenge code represents a random number generated by the low-frequency trigger; S102, after receiving the low-frequency command, the tire pressure sensor generates unique authentication data based on the built-in security chip and the physical unclonable function calculation, and feeds back the unique authentication data to the low-frequency trigger through a high-frequency signal; S103, after the low-frequency trigger receives the high-frequency signal of the tire pressure sensor, the signal feature is extracted, and the high-frequency signal is determined to meet the validity requirement based on the signal feature threshold. When the high-frequency signal meets the validity requirement and the rolling code is matched successfully, it is determined that the sensor is in the target pairing area and enters the secondary authentication stage; In the secondary authentication stage, the low-frequency trigger sends a secondary random challenge code to the tire pressure sensor. After receiving it, the tire pressure sensor performs decryption calculation and generates authentication response data, which is fed back to the low-frequency trigger through a high-frequency signal. The specific steps include: S401, use the internal security chip to parse the secondary random challenge code, and calculate the authentication data in combination with its own PUF identifier. The calculation formula is: , Represents PUF authentication data, represents a unique response value computed using a physically unclonable function, Represents the secondary random challenge code, which is used to verify the identity of the tire pressure sensor. The calculation formula for generating the secondary random challenge code is: ,in, represents the secondary random challenge code, H represents the secure hash function, Indicates the random challenge code in the previous low-frequency instruction. Indicates the authentication timestamp; S402, calculating the authentication response data according to the rolling code, the PUF identifier, and the timestamp, wherein the authentication response data calculation formula is: , represents the authentication response data, H represents the secure hash function, Represents PUF authentication data, represents the authentication timestamp, and R represents the rolling code; S403, encrypt the authentication response data and return it to the low-frequency trigger through a high-frequency signal; After receiving the authentication data, the low-frequency trigger parses and verifies the consistency of the rolling code, the validity of the PUF identifier and the timestamp in sequence; when all the verifications pass, the tire pressure sensor is considered to be matched successfully, otherwise the pairing is rejected. The PUF identifier is a fixed identifier generated by the tire pressure sensor when the device leaves the factory; S104, after determining that the tire pressure sensor is successfully matched, the low-frequency trigger writes the verified tire pressure sensor identification data into the tire pressure detection control unit through the on-board diagnostic system interface and performs a secondary consistency check, wherein the tire pressure sensor identification data includes: a rolling code, a PUF identifier and a timestamp; S105, the low-frequency trigger simulates the high-frequency signal of the tire pressure sensor through the high-frequency transmitter, and the tire pressure detection control unit compares the high-frequency simulation signal with the tire pressure sensor identification data after the secondary consistency check is successful. If the results are consistent, the pairing is confirmed, otherwise the response measures are automatically generated.

2. The method for pairing tire pressure sensors for anti-interference in a vehicle production line according to claim 1, characterized in that: The rolling code is generated according to the unique number of the production line and the first preset time window, and each production line corresponds to an independent rolling code. The rolling code is generated in the following way: ,in, represents the number of the i-th production line, || represents the splicing operation, T represents the first preset time window, and D represents the offset coefficient.

3. The method for pairing tire pressure sensors for anti-interference in a vehicle production line according to claim 2, characterized in that: After receiving the low-frequency command, the tire pressure sensor generates unique authentication data based on the built-in security chip and the physically unclonable function. The specific steps include: S201, construct initial authentication data, the calculation formula is: ,in, represents the initial authentication data, C represents the random challenge code, Indicates the timestamp, Indicates the PUF identifier, S indicates the sensor status, which includes voltage, current and temperature; S202, performing hash calculation on the initial authentication data; S203, when the tire pressure sensor receives the random challenge code, a PUF authentication code is generated using a physical unclonable function; S204, combining the PUF authentication code with the initial authentication data after hash calculation, and performing symmetric encryption to construct unique authentication data.

4. The method for pairing tire pressure sensors for anti-interference in a vehicle production line according to claim 1, characterized in that: The signal characteristics include: signal strength, signal propagation time, signal-to-noise ratio and frequency offset, and the signal characteristic thresholds include: signal strength threshold, signal propagation time threshold, signal-to-noise ratio threshold and frequency offset range threshold.

5. The method for pairing tire pressure sensors for anti-interference in a vehicle production line according to claim 4, characterized in that: The specific steps of extracting signal features include: S301, calculating the signal strength by measuring the instantaneous voltage of the high frequency signal; S302, determining the signal propagation time by calculating the time delay from the high frequency signal of the tire pressure sensor to the low frequency trigger; S303, by calculating the ratio of the received signal power to the background noise power, a signal-to-noise ratio is obtained, wherein the calculation formula of the signal-to-noise ratio is: , SNR stands for signal-to-noise ratio, Indicates the power value of the high-frequency signal emitted by the tire pressure sensor measured at the low-frequency trigger receiving end. It indicates the background noise power value measured by the low-frequency trigger in the no-signal state; S304, calculating a frequency offset according to the received high-frequency signal frequency, wherein the frequency offset is calculated as follows: , represents the frequency offset, Indicates the tire pressure sensor signal frequency measured by the low-frequency trigger. Indicates the standard high-frequency signal frequency, that is, the standard high-frequency signal frequency that the tire pressure sensor should emit when working normally.

6. The method for pairing tire pressure sensors for anti-interference in a vehicle production line according to claim 4, characterized in that: When the low-frequency trigger receives the high-frequency signal from the tire pressure sensor, it determines the validity requirements of each signal feature. The validity requirements specifically include: Signal strength requirement: The signal strength is greater than the signal strength threshold; Signal propagation time requirement: time delay is less than the signal propagation time threshold; Signal-to-noise ratio requirement: The signal-to-noise ratio is greater than the signal-to-noise ratio threshold; Frequency offset requirement: The absolute value of the frequency offset must be less than the frequency offset range threshold.

7. The method for pairing tire pressure sensors for anti-interference in a vehicle production line according to claim 1, characterized in that: The simulated signal characteristic parameters of the high-frequency signal of the tire pressure sensor simulated by the low-frequency trigger include: rolling code, PUF identifier, timestamp, signal frequency, signal modulation mode, signal strength and data packet format.

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