CN115065435A - PCIe interface password card with high-precision time service function - Google Patents

Abstract

The invention relates to the technical field of cipher card time service, in particular to a PCIe interface cipher card with a high-precision time service function, wherein a time service system model comprises a signal layer, a control layer and an interface layer; wherein: the signal layer comprises a secret key generator, a 4G antenna, an NTP server, an RTC time-keeping controller and a satellite antenna; the control layer comprises a data encryption processing module, a 4G signal acquisition device, a time signal resolver, a time master controller, a satellite time signal resolver, an interrupt processor and a satellite signal acquisition device; the interface layer includes a PCI-ex1 interface, interface drivers, and a PC/server. The design of the invention integrates time service and encryption functions, and the invention is connected with a PC/server through a PCI-e slot, thereby having high transmission efficiency and good compatibility; the system can support various time sources such as satellite signals, 4G-LTE signals, NTP signals and the like, can automatically switch according to the signal intensity, ensures the time accuracy and meets diversified use scenes; the PCIex1 interface is used for transmitting data in a point-to-point mode, and the transmission rate is effectively improved.

Description

A PCIe interface password card with high-precision timing function

technical field

The invention relates to the technical field of cipher card timing, in particular to a PCIe interface cipher card with a high-precision timing function.

Background technique

Commercial encryption is an important part of my country's encryption system and is used to protect commercial data information. The application of commercial cryptography is directly related to network security, economic security, national security, and the vital interests of every citizen and social organization. At present, with the in-depth development of intelligence, digitization, and networking, various application systems have higher and higher requirements for commercial cryptographic security. Especially with the development of smart home, cloud computing, mobile internet, big data and other emerging technologies, the demand for cryptographic software, chips, cryptographic modules, cryptographic boards, cryptographic systems and other technologies is becoming more and more urgent.

In terms of communication speed, the PCI bus has been widely used in the embedded field in the past ten years. However, due to the parallel characteristics of the PCI bus, the communication scheme based on the PCI bus is limited by data throughput and bandwidth, and has gradually reached a bottleneck. . With the advantages of efficient serial transmission characteristics, higher transmission rate, and exclusive bandwidth, the PCIe bus standard has developed rapidly once it was launched, and gradually replaced the PCI bus. In terms of the computer motherboard interface, the PCIe slot is the main expansion slot of the motherboard. By plugging in different expansion cards, almost all functions that the computer can achieve, such as sound cards, network cards, graphics cards, USB expansion cards, video capture cards, etc. expansion card. Because of the "universal" compatibility feature, PCIe slots on computer motherboards are often hard to find.

In this context, a new generation of Soc network terminal security chip based cryptographic board came into being. The board supports symmetric encryption algorithms such as SM4, AES, DES, and elliptic curve public key cryptography algorithms such as SM2 and RSA. SM3, SHA1, SHA224, SHA256 and other HASH algorithms are independent of each other, and the PCIe+USB scheme is used to meet the requirements of large amount of cryptographic computation and high real-time performance in network systems. The time service password card integrates time service and password calculation, and only needs one PCIe interface, which is not only compatible with the performance of the encryption algorithm, but also meets the timing requirements. In practical applications, high-precision system time and encryption technology complement each other. The current computer system time is basically provided by the network time or the motherboard clock chip, which can easily lead to large time errors and low precision. Task. So far, it is imperative to develop a combined timing cipher card that can not only meet efficient commercial cipher calculations, but also provide high-precision time. In view of this, we propose a PCIe interface password card with high-precision timing function.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a PCIe interface password card with a high-precision timing function, so as to solve the above-mentioned problems in the background art.

In order to solve the above-mentioned technical problems, one of the purposes of the present invention is to provide a PCIe interface cipher card with a high-precision timing function, and its timing system model includes three parts: a signal layer, a control layer and an interface layer; the signal layer, the control layer and the interface layer are sequentially connected in communication; wherein:

The signal layer includes a key generator, a 4G antenna, an NTP server, an RTC timing controller and a satellite antenna;

The control layer includes a data encryption processing module, a 4G signal acquisition device, a time signal analyzer, a time master controller, a satellite time signal analyzer, an interrupt processor and a satellite signal acquisition device;

The interface layer includes a PCI-e x1 interface, an interface driver and a PC/server.

As a further improvement of this technical solution, the key generator, the 4G antenna, the NTP server, the RTC timing controller and the satellite antenna run in parallel; wherein:

The key generator is connected to the data encryption processing module for generating and storing the encryption and decryption keys used in the data encryption process;

The 4G antenna is connected to the 4G signal acquisition device, used to obtain the time of the operator's base station, and is backward compatible. If the 4G signal is weak, it will automatically switch to 3G and 2G base stations;

The RTC timing controller is connected to the time master for transmitting time information or a 1pps pulse signal to the time master;

The satellite antenna is connected to the satellite signal acquisition device for receiving satellite signals.

As a further improvement of the technical solution, the RTC timing controller uses a temperature-compensated crystal oscillator, which has high precision, and can still provide high-precision timing services when the external clock source is invalid.

As a further improvement of this technical solution, the data encryption processing module operates independently, the 4G signal acquisition device, the time signal analyzer and the time master are connected in sequence for communication, and the satellite signal acquisition device is connected through parallel The running satellite time signal parser and the interrupt handler are connected in communication with the time master; wherein:

The data encryption processing module is connected to the PCI-e interface for transparent transmission of data streams with the PC/server;

The time signal parser is connected to the NTP server through GPRS for obtaining network time;

The time master is connected to the PCI-e interface for transmission of time messages/control commands with the PC/server;

The satellite time signal analyzer is connected to the satellite signal acquisition device, and the satellite signal acquisition device converts the satellite signal into an NMEA protocol data packet, and outputs a time message in a serial port mode through the satellite time signal analyzer;

The interrupt processor is connected to the satellite signal acquisition device, and the interrupt processor receives the 1pps pulse signal output by the satellite signal acquisition device.

As a further improvement of this technical solution, the core of the data encryption processing module is a set of data encryption and decryption algorithm sub-modules; wherein, the algorithm sub-modules include elliptic curve public key cryptographic algorithms such as SM2 and RSA, and symmetric symmetric algorithms such as SM4, AES, and DES. Encryption algorithm, SM3, SHA1, SHA224, SHA256 and other HASH algorithms, and each algorithm is independent of each other.

As a further improvement of this technical solution, the time master is the core of the timing system model, which obtains time information in different scenarios through three time signal sources, 4G-LTE, satellite, and NTP, and is used to synchronize the time information in the password card. time, and can automatically switch according to the signal strength of the time source.

As a further improvement of this technical solution, the time master can satisfy diversified usage scenarios through independently working time sources, and the time source deployment solutions for different scenarios are as follows:

In the network communication room where it is inconvenient to deploy satellite antennas outdoors, 4G antennas can be placed indoors, and 4G-LTE/NTP time sources can be used to completely eliminate the damage to equipment caused by lightning weather;

When using GPS/Beidou satellite signals, it can reach microsecond-level timing accuracy;

Through the built-in high-precision punctual clock source, namely the RTC punctual controller, using a temperature-compensated crystal oscillator, it can still provide high-precision timing services when the external clock source is invalid.

As a further improvement of this technical solution, the specific method for the time master to automatically switch according to the signal strength of the time source includes the following:

Pre-set the intensity of patrol satellite signals, LTE signals, and NTP signals at specific intervals (for example, 10 minutes), and the priority is in the order of satellite signals > NTP signals > LTE signals; specifically:

A. The satellite signal has a strong relationship with the placement direction of the satellite antenna and whether it is open or not. When the antenna is placed in a strongly occluded environment such as indoors or between buildings, the satellite module often cannot identify effective signals. When the intensity is too weak or the time When the data is incorrect, the current time source will be switched to the signal source with the next priority and is in a valid state;

B. Under the NTP signal, the timing servers of Alibaba Cloud, the National Time Service Center, the Hong Kong Observatory of China, the American Institute of Standards and Technology, the University of Science and Technology of China, etc. are patrolled each time, and the weights are recorded according to the signal stability of different servers after each patrol. When the weight exceeds the set value, the time will no longer be obtained from the server; in this way, the optimal NTP time server in different regions and different network environments will be screened; It will be switched to the active signal source; under this condition, if the satellite signal is valid in the patrol result, the NTP signal source can be interrupted and switched to the satellite signal source;

C. The time under the LTE signal generally comes from the time of the operator's base station around the device; if the device cannot connect to the base station or the time provided by the base station is invalid, the current time source will be switched to the signal source in the valid state; under this condition, if the round After the satellite signal or NTP signal is valid in the patrol result, the LTE signal source can be interrupted and switched to the high-priority signal source;

D. If the above three signals are invalid, the board uses the built-in RTC timing controller to run the time. The controller has a built-in temperature compensated crystal oscillator, which can still provide reliable time stably, and the annual error is less than ±0.4 seconds.

As a further improvement of this technical solution, the PCI-e x1 interface, the interface driver and the PC/server are sequentially connected through communication; wherein:

The PCI-e x1 interface is connected to each module of the control layer, obtains corresponding time signals from different time sources, and is driven by the interface to realize connection with different PCs/servers through different interface methods, thereby Realize the transmission of time data stream, time message/control command.

The PCI-e x1 interface is compatible with x2, x4, x8, x16 and higher-speed x32; the PCI-e x1 interface is connected to the password function and timing function of the password card through USB, and uses PCIe+USB communication The scheme adopts the serial interconnection method to carry out data transmission in the form of point-to-point, and each device can enjoy the bandwidth independently.

Another object of the present invention is to provide a PCIe interface password card timing system operating platform device, including a processor, a memory, and a computer program stored in the memory and running on the processor, and the processor is used to execute the computer program. Any of the above-mentioned PCIe interface password cards with high-precision timing function.

The third object of the present invention is to provide a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, any one of the above-mentioned high-precision timing functions can be realized. PCIe interface password card.

Compared with the prior art, the beneficial effects of the present invention:

1. The PCIe interface password card with high-precision timing function can integrate timing and encryption functions, and is connected with PC/server through PCI-e slot, with high transmission efficiency and better compatibility;

2. The PCIe interface password card with high-precision timing function can support BeiDou/GPS dual-mode satellite signals, 4G-LTE signals, NTP signals and other time sources, with internal autonomous time source management, and patrol satellite signals at specific time intervals. , LTE signal, NTP signal strength, priority according to the order of satellite signal > NTP signal > LTE signal, it can be automatically switched according to the signal strength of the time source to ensure the accuracy of time, and each time source can work independently to meet diversified use Scenes;

3. The PCIe interface password card with high-precision timing function uses PCIe x1 interface, compatible with x2, x4, x8, x16 and higher-speed x32, uses PCIe+USB communication scheme, adopts serial interconnection, in the form of point-to-point For data transmission, each device can enjoy the bandwidth independently, effectively improving the transmission rate.

Description of drawings

Fig. 1 is the overall framework block diagram of the timing system model of cipher card in the present invention;

Fig. 2 is the partial structure module block diagram of cipher card among the present invention;

FIG. 3 is a schematic structural diagram of an exemplary electronic computer platform device in the present invention.

The meanings of the symbols in the figure are:

1. Signal layer; 11. Key generator; 12. 4G antenna; 13. NTP server; 14. RTC timing controller; 15. Satellite antenna;

2. Control layer; 21. Data encryption processing module; 22. 4G signal acquisition device; 23. Time signal analyzer; 24. Time master; 25. Satellite time signal analyzer; 26. Interrupt processor; 27. Satellite signal acquisition device;

3. Interface layer; 31. PCI-e x1 interface; 32. Interface driver; 33. PC/server.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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, but not all of 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.

Example 1

As shown in Figure 1-3, this embodiment provides a PCIe interface password card with high-precision timing function. The timing system model includes three parts: signal layer 1, control layer 2, and interface layer 3; signal layer 1, control layer Layer 2 and interface layer 3 are sequentially connected to communicate; among them:

The signal layer 1 includes a key generator 11, a 4G antenna 12, an NTP server 13, an RTC timing controller 14 and a satellite antenna 15;

The control layer 2 includes a data encryption processing module 21, a 4G signal acquisition device 22, a time signal analyzer 23, a time master controller 24, a satellite time signal analyzer 25, an interrupt processor 26 and a satellite signal acquisition device 27;

The interface layer 3 includes a PCI-e x1 interface 31 , an interface driver 32 and a PC/server 33 .

In this embodiment, the key generator 11, the 4G antenna 12, the NTP server 13, the RTC timing controller 14 and the satellite antenna 15 operate in parallel; wherein:

The key generator 11 is connected to the data encryption processing module 21 for generating and storing the encryption and decryption keys used in the data encryption process;

The 4G antenna 12 is connected to the 4G signal acquisition device 22, which is used to obtain the time of the operator's base station and is backward compatible. If the 4G signal is weak, it will automatically switch to the 3G and 2G base stations;

The RTC timing controller 14 is connected to the time master 24 for transmitting time information or a 1pps pulse signal to the time master 24;

The satellite antenna 15 is connected to the satellite signal acquisition device 27 for receiving satellite signals.

In this embodiment, the RTC timing controller 14 uses a temperature-compensated crystal oscillator, which has high precision, and can still provide high-precision timing services when the external clock source is invalid.

In this embodiment, the data encryption processing module 21 operates independently, the 4G signal acquisition device 22, the time signal analyzer 23 and the time master 24 are sequentially connected in communication, and the satellite signal acquisition device 27 passes through the satellite time signal analyzer 25 running in parallel. , the interrupt handler 26 is connected in communication with the time master 24; wherein:

The data encryption processing module 21 is connected to the PCI-e interface 31 for transparent transmission of the data stream with the PC/server 33;

The time signal parser 23 is connected to the NTP server 13 through GPRS for acquiring network time;

The time master 24 is connected to the PCI-e interface 31 for transmission of time messages/control commands with the PC/server 33;

The satellite time signal analyzer 25 is connected to the satellite signal acquisition device 27, and the satellite signal acquisition device 27 converts the satellite signal into an NMEA protocol data packet, and outputs the time message by the serial port mode through the satellite time signal analyzer 25;

The interrupt processor 26 is connected to the satellite signal acquisition device 27 , and the interrupt processor 26 receives the 1pps pulse signal output by the satellite signal acquisition device 27 .

In this embodiment, the core of the data encryption processing module 21 is a set of data encryption and decryption algorithm submodules; wherein, the algorithm submodules include elliptic curve public key cryptographic algorithms such as SM2 and RSA, symmetric encryption algorithms such as SM4, AES, and DES, and SM3 , SHA1, SHA224, SHA256 and other HASH algorithms, and each algorithm is independent of each other.

In this embodiment, the time master 24 is the core of the timing system model, which obtains time information in different scenarios through three time signal sources, 4G-LTE, satellite, and NTP, and is used to synchronize the time in the password card, and Automatic switching can be performed according to the signal strength of the time source.

In the present embodiment, the time master 24 satisfies diversified usage scenarios through independently working time sources, and the time source deployment schemes for different scenarios are:

In the network communication room where it is inconvenient to deploy the satellite antenna 15 to the outdoors, the 4G antenna 12 can be arranged indoors, and the 4G-LTE/NTP time source can be used to completely eliminate the damage to the equipment caused by lightning weather;

When using GPS/Beidou satellite signals, it can reach microsecond-level timing accuracy;

Through the built-in high-precision timing clock source, namely the RTC timing controller 14, using a temperature-compensated crystal oscillator, it can still provide high-precision timing services when the external clock source is invalid.

In this embodiment, the specific method for the time master 24 to automatically switch according to the signal strength of the time source includes the following:

Pre-set the intensity of patrol satellite signals, LTE signals, and NTP signals at specific intervals (for example, 10 minutes), and the priority is in the order of satellite signals > NTP signals > LTE signals; specifically:

A. The satellite signal has a strong relationship with the placement direction of the satellite antenna 15 and whether it is open or not. When the antenna is placed in a strongly occluded environment such as indoors or between buildings, the satellite module often cannot identify effective signals. When the intensity is too weak or When the time data is incorrect, the current time source will be switched to the signal source with the next priority and is in a valid state;

B. Under the NTP signal, the timing servers of Alibaba Cloud, the National Time Service Center, the Hong Kong Observatory of China, the American Institute of Standards and Technology, the University of Science and Technology of China, etc. are patrolled each time, and the weights are recorded according to the signal stability of different servers after each patrol. When the weight exceeds the set value, the time will no longer be obtained from the server; in this way, the optimal NTP time server in different regions and different network environments will be screened; It will be switched to the active signal source; under this condition, if the satellite signal is valid in the patrol result, the NTP signal source can be interrupted and switched to the satellite signal source;

C. The time under the LTE signal generally comes from the time of the operator's base station around the device; if the device cannot connect to the base station or the time provided by the base station is invalid, the current time source will be switched to the signal source in the valid state; under this condition, if the round After the satellite signal or NTP signal is valid in the patrol result, the LTE signal source can be interrupted and switched to the high-priority signal source;

D. If the above three signals are invalid, the board uses the built-in RTC timing controller 14. The controller has a built-in temperature compensated crystal oscillator, which can still provide reliable time stably, with an annual error of less than ±0.4 seconds.

In this embodiment, the PCI-e x1 interface 31, the interface driver 32 and the PC/server 33 are sequentially connected through communication; wherein:

The PCI-e x1 interface 31 is connected to each module of the control layer 2, obtains corresponding time signals from different time sources, and drives 32 through the interface to connect with different PCs/servers 33 through different interface methods, thereby realizing time data flow , Time message/control command transmission.

The PCI-e x1 interface 31 is compatible with x2, x4, x8, x16 and higher-speed x32; the PCI-e x1 interface 31 is respectively connected with the password function and timing function of the password card through USB, using PCIe+USB The communication scheme adopts serial interconnection mode to carry out data transmission in the form of point-to-point, and each device can enjoy the bandwidth independently.

As shown in FIG. 3 , this embodiment also provides an operating platform device for a PCIe interface password card timing system, the device includes a processor, a memory, and a computer program stored in the memory and running on the processor.

The processor includes one or more processing cores, the processor is connected to the memory through a bus, and the memory is used for storing program instructions. When the processor executes the program instructions in the memory, the above-mentioned PCIe interface password card with high-precision timing function is implemented.

Alternatively, the memory can be implemented by any type of volatile or non-volatile storage device or combination thereof, such as static anytime access memory (SRAM), electrically erasable programmable read only memory (EEPROM), Erasing Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Magnetic Disk or Optical Disk.

In addition, the present invention also provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned PCIe interface password card with high-precision timing function is implemented.

Optionally, the present invention also provides a computer program product containing instructions, which, when running on a computer, enables the computer to execute the PCIe interface password card with high-precision timing function in the above aspects.

Those of ordinary skill in the art can understand that all or part of the steps of implementing the above-mentioned embodiments can be completed by hardware, or can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. The above-mentioned storage medium It can be a read-only memory, a magnetic disk or an optical disk, etc.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions are only preferred examples of the present invention, and are not intended to limit the present invention, without departing from the spirit and scope of the present invention. Under the premise, the present invention will also have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. a PCIe interface cipher card with high-precision timing function is characterized in that: its timing system model comprises three parts of signal layer (1), control layer (2) and interface layer (3); the signal layer (1) ), the control layer (2) and the interface layer (3) are sequentially connected in communication; wherein: The signal layer (1) includes a key generator (11), a 4G antenna (12), an NTP server (13), an RTC timing controller (14) and a satellite antenna (15); The control layer (2) includes a data encryption processing module (21), a 4G signal acquisition device (22), a time signal parser (23), a time master controller (24), a satellite time signal parser (25), an interrupt a processor (26) and a satellite signal acquisition device (27); The interface layer (3) includes a PCI-e x1 interface (31), an interface driver (32) and a PC/server (33). 2. The PCIe interface password card with high-precision timing function according to claim 1, characterized in that: the secret key generator (11), the 4G antenna (12), the NTP server (13), The RTC timing controller (14) operates in parallel with the satellite antenna (15); wherein: The key generator (11) is connected to the data encryption processing module (21) for generating and storing the encryption and decryption keys used in the data encryption process; The 4G antenna (12) is connected to the 4G signal acquisition device (22), and is used to obtain the time of the operator's base station, which is backward compatible, and automatically switches to 3G and 2G base stations if the 4G signal is weak; The RTC timing controller (14) is connected to the time master (24) for transmitting time information or a 1pps pulse signal to the time master (24); The satellite antenna (15) is connected to the satellite signal acquisition device (27) for receiving satellite signals. 3. the PCIe interface cipher card with high-precision timing function according to claim 1, it is characterized in that: described RTC time-keeping controller (14) uses temperature compensated crystal oscillator, has high precision, it is when external clock source is invalid High-precision timing services can still be provided. 4. The PCIe interface cipher card with high-precision timing function according to claim 1, characterized in that: the data encryption processing module (21) operates independently, the 4G signal acquisition device (22), the time signal The parser (23) is communicated with the time master (24) in sequence, and the satellite signal acquisition device (27) is connected through the satellite time signal parser (25) and the interrupt handler (25) running in parallel respectively. 26) communicate with the time master (24); wherein: The data encryption processing module (21) is connected to the PCI-e interface (31) for transparent transmission of the data stream with the PC/server (33); The time signal parser (23) is connected to the NTP server (13) through GPRS for acquiring network time; The time master (24) is connected to the PCI-e interface (31) for transmission of time messages/control commands with the PC/server (33); The satellite time signal analyzer (25) is connected to the satellite signal acquisition device (27), and the satellite signal acquisition device (27) converts the satellite signal into an NMEA protocol data packet, and passes the satellite time signal analyzer (27) through the satellite time signal analyzer ( 25) Output time message by serial port; The interrupt processor (26) is connected with the satellite signal acquisition device (27), and the interrupt processor (26) receives the 1pps pulse signal output by the satellite signal acquisition device (27). 5. The PCIe interface cipher card with high-precision timing function according to claim 1, wherein the core of the data encryption processing module (21) is a group of data encryption and decryption algorithm submodules; wherein, the algorithm submodule It includes elliptic curve public key cryptography algorithms such as SM2 and RSA, symmetric encryption algorithms such as SM4, AES, and DES, and HASH algorithms such as SM3, SHA1, SHA224, and SHA256, and each algorithm is independent of each other. 6. The PCIe interface cipher card with high-precision timing function according to claim 1, it is characterized in that: described time master (24) is the core of timing system model, and it passes through 4G-LTE, satellite, NTP three It can obtain time information in different scenarios, which is used to synchronize the time in the password card, and can automatically switch according to the signal strength of the time source. 7. The PCIe interface cipher card with high-precision timing function according to claim 1, characterized in that: the time master (24) satisfies diversified usage scenarios by the time source of independent work, and the time of each different scenario The source deployment scheme is: In the network communication room where it is inconvenient to deploy the satellite antenna (15) to the outdoor, the 4G antenna (12) can be arranged indoors, and the 4G-LTE/NTP time source can be used to completely eliminate the damage to the equipment caused by lightning weather; When using GPS/Beidou satellite signals, it can reach microsecond-level timing accuracy; Through the built-in high-precision time-keeping clock source, namely, the RTC time-keeping controller (14), using a temperature-compensated crystal oscillator, it can still provide high-precision time service when the external clock source is invalid. 8. the PCIe interface password card with high-precision timing function according to claim 1, is characterized in that: the concrete method that described time master (24) automatically switches according to time source signal strength comprises as follows: Pre-set the intensity of the satellite signal, LTE signal, and NTP signal to patrol at a specific time interval, and the priority is in the order of satellite signal>NTP signal>LTE signal; specifically: A. The satellite signal has a strong relationship with the placement direction of the satellite antenna (15) and whether it is open or not. When the antenna is placed in a strongly occluded environment such as indoors or between buildings, the satellite module often cannot identify effective signals. When the intensity is too high When the time data is weak or the time data is wrong, the current time source will be switched to the signal source with the next priority and is in a valid state; B. Under the NTP signal, the timing servers of Alibaba Cloud, the National Time Service Center, the Hong Kong Observatory, the American Institute of Standards and Technology, the University of Science and Technology of China, etc. are patrolled each time, and the weights are recorded according to the signal stability of different servers after each patrol. After the weight value exceeds the set value, the time will no longer be obtained from the server; the optimal NTP time server in different regions and different network environments will be filtered out; if valid time cannot be provided under NTP or cannot be connected to a valid server, the current time source will Switch to the active signal source; under this condition, if the satellite signal is valid in the patrol result, the NTP signal source can be interrupted and switched to the satellite signal source; C. The time under the LTE signal generally comes from the time of the operator's base station around the device; if the device cannot connect to the base station or the time provided by the base station is invalid, the current time source will be switched to the signal source in the valid state; under this condition, if the round After the satellite signal or NTP signal is valid in the patrol result, the LTE signal source can be interrupted and switched to the high-priority signal source; D. If the above three signals are invalid, the board uses the built-in RTC timing controller (14) for running time. The controller has a built-in temperature compensated crystal oscillator, which can still provide reliable time stably, with an annual error of less than ±0.4 seconds. 9. The PCIe interface password card with high-precision timing function according to claim 1, characterized in that: the PCI-e x1 interface (31), the interface driver (32) and the PC/server ( 33) Connected by communication in turn; wherein: The PCI-e x1 interface (31) is connected to each module of the control layer (2), obtains corresponding time signals from different time sources, and drives (32) through the interface to realize different interface modes and different time signals. The PC/server (33) is connected, so as to realize the transmission of time data stream and time message/control command. 10. The PCIe interface password card with high-precision timing function according to claim 1, characterized in that: the PCI-e x1 interface (31) is compatible with x2, x4, x8, x16 and higher-speed x32; the The PCI-e x1 interface (31) is respectively connected with the password function and the timing function of the password card by means of USB.

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