CN118034012A

CN118034012A - GNSS clock synchronization method and device based on low power consumption

Info

Publication number: CN118034012A
Application number: CN202410218328.4A
Authority: CN
Inventors: 胡耀星; 游庆瑜; 张妍; 赵春蕾
Original assignee: Institute of Geology and Geophysics of CAS
Current assignee: Institute of Geology and Geophysics of CAS
Priority date: 2024-02-28
Filing date: 2024-02-28
Publication date: 2024-05-14

Abstract

The application discloses a low-power-consumption GNSS clock synchronization method and device, which are applied to the technical field of seismograph clock synchronization, and the method comprises the following steps: obtaining UBX data packet information; analyzing the state information of the GPS in the UBX data packet information, and analyzing corresponding UTC time information when the state information is in a positioning state; synchronizing the UTC time information to a local RTC clock, correcting the local clock frequency through PPS second pulse signals, completing clock synchronization, and entering an acquisition mode; according to the state information, adjusting a working mode, and carrying out alignment and linear interpolation through deviation between the PPS second pulse signal and a local clock; synchronizing the local clocks correspondingly, and storing the acquired data after linear interpolation; the synchronization of the low-power-consumption GNSS clock is effectively realized, and the acquisition working time is prolonged.

Description

GNSS clock synchronization method and device based on low power consumption

Technical Field

The invention relates to the technical field of seismometer clock synchronization, in particular to a low-power-consumption GNSS clock synchronization method and device.

Background

The seismometer usually acquires the position and clock information of the seismometer through a GNSS module, and as the acquisition time length increases, a crystal oscillator in the seismometer generates frequency drift along with the change of temperature and environment to cause the accumulation phenomenon of clock errors. Along with the development direction of the seismograph moving to the distributed high-precision acquisition, the clock precision becomes an important index for measuring the performance of equipment. The traditional method adopts GPS as a unified external clock source to correct the internal clock of the seismometer in real time so as to eliminate the problems of deviation and clock consistency of the internal clock. The seismometer calibrates the oscillation frequency of the internal crystal oscillator by acquiring the clock information and the PPS signal of the GPS, when the RTC time of the system is consistent with the PPS second pulse interval of the GPS, the internal clock is used as the oscillation frequency of the internal clock in second units to realize the synchronous acquisition with the clock of the GPS, and the correction function of the internal clock is realized by the synchronization with the PPS signal of the real-time GPS during the acquisition. Because the internal power supply of the seismometer is supplied by a limited battery, how to realize high-precision data acquisition under the condition of low power consumption becomes a main research direction of the seismometer. Therefore, the traditional method at present only reserves the acquisition unit and the GPS module by closing all external interaction facilities during the acquisition of the instrument so as to reduce the running power consumption of the whole machine and increase the working time, thereby realizing the acquisition function of low power consumption.

Therefore, the low-power consumption GNSS clock synchronization is realized based on the application characteristics of the seismograph clock synchronization, and the low-power consumption GNSS clock synchronization becomes an application problem which needs to be solved in actual seismic acquisition.

In order to overcome the defects, the application provides a GNSS clock synchronization method and device based on low power consumption.

Disclosure of Invention

The application aims to provide a GNSS clock synchronization method and device based on low power consumption, and aims to solve the problems.

In order to achieve the above purpose, the present application provides the following technical solutions:

The application provides a GNSS clock synchronization method based on low power consumption, which comprises the following steps:

Obtaining UBX data packet information;

Analyzing the state information of the GPS in the UBX data packet information, and analyzing corresponding UTC time information when the state information is in a positioning state;

Synchronizing the UTC time information to a local RTC clock, correcting the local clock frequency through PPS second pulse signals, completing clock synchronization, and entering an acquisition mode;

According to the state information, adjusting a working mode, and carrying out alignment and linear interpolation through deviation between the PPS second pulse signal and a local clock;

And synchronizing the local clocks correspondingly, and storing the acquired data after linear interpolation.

Further, in the step of adjusting the working mode according to the state information and performing alignment and linear interpolation by the deviation between the PPS second pulse signal and the local clock, the method specifically includes the following steps:

And adjusting the working mode into a cyclic tracking mode with a preset period, synchronizing the clocks when the local clock reaches the preset period, and aligning and linearly interpolating the deviation between the PPS second pulse signal and the local clock.

Further, in the step of synchronizing the local clocks and storing the linearly interpolated collected data, the method specifically includes the following steps:

And judging whether the acquired state information is effectively positioned, if so, comparing the second information of the local clock with a PPS second pulse interrupt signal, performing linear interpolation on acquired data according to the deviation of the local clock, and simultaneously performing corresponding clock synchronization on the local clock.

Further, when the state information is in a locked state, correcting the PPS second pulse signal and the local clock, and performing linear interpolation on the acquired data to wait for entering a clock synchronization state of a next preset period.

Further, when the state information is in an unlocking state, the working mode is adjusted to a cyclic tracking mode with a preset period to search satellite signals, and clock synchronization and storage of collected data are carried out again until the obtained state information is in a locking state;

and if the state information is in an unlocking state after a plurality of times of clock synchronization, adjusting the working mode into a continuous working mode to search satellite signals.

The application also provides a GNSS clock synchronization device based on low power consumption, which comprises: the system comprises a GNSS module, a main control unit, an earthquake signal acquisition module, a storage module and a power supply module;

the GNSS module is used for acquiring the UBX data packet information;

The main control unit is used for analyzing the state information of the GPS in the UBX data packet information, and analyzing corresponding UTC time information when the state information is in a positioning state; the system is also used for adjusting a working mode according to the state information, and performing alignment and linear interpolation through deviation between the PPS second pulse signal and a local clock;

The seismic signal acquisition module is used for synchronizing to a local RTC clock according to the UTC time information acquired by the GNSS module, correcting the local clock frequency through PPS second pulse signals, completing clock synchronization, entering an acquisition mode and transmitting acquired data to the main control unit;

the storage module is used for storing the acquired data;

The power module is used for providing energy.

Further, when the state information acquired by the GNSS module is in an unlocked state, the main control unit sends an instruction to set the GNSS module to a preset period for clock synchronization;

When the main control unit judges that the state information is locked, the seismic signal acquisition module performs local clock synchronization and inputs acquired data into the storage module;

after the acquisition mode is completed, the main control unit adjusts the device to a low-power consumption working mode.

The application provides equipment, which comprises a processor and a memory coupled with the processor, wherein the memory stores program instructions for realizing a GNSS clock synchronization method based on low power consumption; the processor is configured to execute the program instructions stored in the memory to achieve a low power consumption based GNSS clock synchronization.

The application provides a storage medium storing program instructions executable by a processor, wherein the program instructions are used for executing a low-power-consumption GNSS clock synchronization method.

The application provides a GNSS clock synchronization method and device based on low power consumption, which have the following beneficial effects:

(1) By optimizing the cyclic tracking mode, high-precision clock synchronization can be realized when satellite signals are strong; meanwhile, when the signal is weak or only few satellite signals are generated, the clock synchronization precision can be further improved by starting a full-power continuous working mode and rapidly locking and positioning;

(2) The working mode is dynamically adjusted according to the state of the GNSS received signal, so that the working power consumption of the GNSS module is effectively reduced; under the environment of good satellite signals, clock synchronization is carried out through a periodic working mode, so that the power consumption is obviously reduced;

(3) The method and the device provided by the application reduce the power consumption, so that the acquisition device can work for a longer time under the limited power supply, more data can be acquired, and the integrity and the reliability of the data are improved;

(4) The application is suitable for various acquisition equipment needing high-precision clock synchronization, in particular to equipment needing long-time continuous operation such as seismometers, and the like, adapts to different environments and use scenes by dynamically adjusting the working mode and the performance parameters of the GNSS module, and has wide application prospect.

Drawings

FIG. 1 is a flow chart of a GNSS clock synchronization method with low power consumption according to embodiment 1 of the present application;

FIG. 2 is a schematic diagram of a GNSS clock synchronization device with low power consumption according to embodiment 2 of the present application;

FIG. 3 is a schematic view of the apparatus according to embodiment 3 of the present application;

Fig. 4 is a schematic diagram of a storage medium structure according to embodiment 4 of the present application.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Example 1

Fig. 1 is a flow chart of a low-power consumption GNSS clock synchronization method according to embodiment 1 of the present application; the method comprises the following steps:

s1: UBX data packet information is obtained.

In this embodiment, UBX packet information is an extension of the NMEA 0183 standard, developed by u-blox company and used for its GPS module. The UBX protocol provides a more efficient and flexible way to acquire GPS data, and compared to the conventional NMEA protocol, the UBX protocol has smaller packets, more rapid parsing, and more data fields and more accurate time information.

In seismometer acquisition UBX packet information is used to achieve low power clock synchronization. When the GPS module can stably lock the PPS second pulse signal, the clock synchronization with low power consumption is realized by optimizing a cyclic tracking mode. When the signal is weak or only few satellite signals are generated, a full-power continuous working mode is started to quickly lock and position so as to ensure the accuracy and stability of clock synchronization.

UBX data packet information provides an efficient, flexible and accurate GPS data acquisition mode, and provides powerful support for realizing clock synchronization with low power consumption.

S2: and analyzing the state information of the GPS in the UBX data packet information, and analyzing corresponding UTC time information when the state information is in a positioning state.

In this embodiment, UBX packet information is first acquired, typically transmitted in binary form, including GPS status information and other relevant information. In UBX protocol, each packet has a specific header for identifying the type and length of the packet; by checking the header information of the data packet, it is determined whether GPS state information is contained.

After the type of the packet is confirmed, the content of the packet is parsed, which generally involves converting binary data into readable information, such as ASCII codes. For the state information of the GPS, a corresponding field needs to be found, which usually contains information about satellite visibility, signal quality, positioning state, etc.

In parsing the data packet, status information about the GPS is extracted. Including but not limited to the number of satellites, PDOP (position accuracy dilution), HDOP (horizontal accuracy dilution), and VDOP (vertical accuracy dilution), etc.

In order to ensure the accuracy of the data, data verification is required. By calculating a checksum or using other error detection algorithms. If the data verification fails, the data packet needs to be received or processed again.

Throughout the parsing we need to follow the specifications of UBX protocol to ensure correctness and compatibility of the data. In addition, various tools and libraries can be used to simplify the parsing process and improve the data processing efficiency.

S3: and synchronizing the UTC time information to a local RTC clock, correcting the local clock frequency through PPS second pulse signals, completing clock synchronization, and entering an acquisition mode.

In this embodiment, the acquired UTC time information is synchronized to a local RTC clock, the received PPS second pulse signal is compared with the local crystal oscillator frequency, so as to obtain the real frequency of the local clock, and the acquisition mode is entered after clock synchronization is completed through correction.

S4: and adjusting a working mode according to the state information, and performing alignment and linear interpolation through deviation between the PPS second pulse signal and a local clock.

In this embodiment, the working mode is adjusted to a cyclic tracking mode with a preset period, and when the local clock reaches the preset period, clock synchronization is performed, and the deviation between the PPS second pulse signal and the local clock is aligned and linearly interpolated.

S5: and synchronizing the local clocks correspondingly, and storing the acquired data after linear interpolation.

In this embodiment, it is determined whether the acquired state information is bit-effectively located, if so, the second information of the local clock is compared with the PPS second pulse interrupt signal, and the acquired data is linearly interpolated according to the deviation of the local clock, and the local clock is synchronized correspondingly.

And when the state information is in a locking state, correcting the PPS second pulse signal and the local clock, and linearly interpolating the acquired data and waiting for entering a clock synchronization state of the next preset period.

When the state information is in an unlocking state, the working mode is adjusted to a cyclic tracking mode with a preset period to search satellite signals, and clock synchronization and storage of collected data are carried out again until the acquired state information is in a locking state;

In summary, in embodiment 1 of the present application, the working mode is dynamically adjusted by acquiring the state information, so as to realize the requirement of the acquisition mode on clock correction, and provide technical support for the application of low-power acquisition.

Example 2

Fig. 2 is a schematic structural diagram of a GNSS clock synchronization device with low power consumption according to embodiment 2 of the present application; the specific contents include: the system comprises a GNSS module, a main control unit, an earthquake signal acquisition module, a storage module and a power module.

The GNSS module is used for acquiring the UBX data packet information;

the storage module is used for storing the acquired data;

The power module is used for providing energy.

In this embodiment, the high-precision GNSS module is connected to the seismic signal acquisition module, and the seismic signal acquisition module performs clock synchronization on the local clock and the GPS signal, and then enters an acquisition mode of the seismic signal, and sends acquired data to the main control unit; the main control unit stores data through the storage module; the power module provides the function of supplying power to the device.

During the acquisition mode, the clock frequency of the internal quartz crystal oscillator is influenced by environmental changes such as temperature, so that the clock frequency of the crystal oscillator is deviated, and therefore, the seismic signal acquisition module needs to be in clock synchronization with the GNSS module in real time to eliminate clock error influence. In order to realize low-power consumption acquisition, the main control unit dynamically adjusts the clock synchronization period of the satellite signal acquired by the GNSS module according to the acquisition period during the acquisition, thereby realizing the purpose of low-power consumption clock synchronization acquisition.

Specifically, when the equipment completes initialization preparation and enters a clock synchronization work flow of the seismic signal acquisition module, the GNSS module initializes and enters a full-power continuous working mode to receive GPS signals, and UBX data packet information received by the GNSS module is acquired through a serial port corresponding to the main control unit. The main control unit analyzes GPS state information in UBX data packet information, and analyzes corresponding UTC time information when the state information is in a positioning state.

The seismic signal acquisition module synchronizes to a local RTC clock through UTC time information acquired by the GNSS module, compares the received PPS second pulse signal with the local crystal oscillator frequency to obtain the real frequency of the local clock, and enters an acquisition mode after clock synchronization is completed through correction.

The main control unit sets the GNSS module to a cycle tracking mode with 10s as a period according to the state information received by the GNSS module, starts clock synchronization when the local clock reaches a time interval of 10s during acquisition, and aligns local clock deviation with PPS second pulses and carries out linear interpolation of acquired data. And simultaneously, sending the acquired data after corresponding clock synchronization and linear interpolation of the local clock to a storage module for storing the acquired data.

If the state information received by the GNSS module is in an unlocking state during the synchronization period, the main control unit sets the GNSS module to be in a short-term clock synchronization with the period of 5s by sending an instruction. The master control unit can judge clock synchronization according to the acquired state information, and when the received state information is locked, the earthquake signal acquisition module starts internal clock synchronization and acquisition data storage.

If the GPS clock synchronization still cannot be performed, the main control unit switches the GNSS into a full-power continuous working mode to search the locking information of the satellite signals, and the local clock synchronization correction and the storage of the acquired data are not performed until the locking information is received. After clock synchronization is completed, the main control unit switches the GNSS module into a cycle tracking mode with a preset period to perform clock synchronization until the main control unit adjusts the working mode into a low-power-consumption working mode when data acquisition is completed.

In summary, in embodiment 2 of the present application, after acquiring UTC time information by using a high-precision GNSS module and performing local clock correction, the seismic signal acquisition module enters an acquisition state; the clock crystal oscillator needs to be corrected with the PPS signal of the GPS in real time due to the change of the ambient temperature during the acquisition, so that the main control unit dynamically adjusts through the state information to reduce the power consumption during the system working period, the GNSS module is adjusted according to the periodic circulating working mode, the synchronization of the low-power-consumption GNSS clock is realized, and the working time of the whole acquisition device is prolonged.

Example 3

Fig. 3 is a schematic diagram of an apparatus structure according to embodiment 3 of the present application. The device 50 includes a processor 51, a memory 52 coupled to the processor 51.

The memory 52 stores program instructions for implementing a low power GNSS clock synchronization method as described above.

The processor 51 is configured to execute program instructions stored in the memory 52 to implement a low power GNSS clock based synchronization.

The processor 51 may also be referred to as a CPU (Central Processing Unit ).

The processor 51 may be an integrated circuit chip with signal processing capabilities. Processor 51 may also be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

Example 4

Fig. 4 is a schematic structural diagram of a storage medium according to embodiment 4 of the present application. The storage medium of the embodiment of the present application stores a program file 61 capable of implementing all the methods described above, where the program file 61 may be stored in the storage medium in the form of a software product, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, an optical disk, or other various media capable of storing program codes, or a computer, a server, a mobile phone, a tablet, or other devices.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, apparatus, article, or method. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, apparatus, article, or method that comprises the element.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application or direct or indirect application in other related technical fields are included in the scope of the present application.

Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.

Of course, the present invention can be implemented in various other embodiments, and based on this embodiment, those skilled in the art can obtain other embodiments without any inventive effort, which fall within the scope of the present invention.

Claims

1. A low power consumption based GNSS clock synchronization method, comprising:

Obtaining UBX data packet information;

2. The method according to claim 1, wherein in the step of adjusting the operation mode according to the state information, the alignment and linear interpolation by the deviation between the PPS second pulse signal and the local clock, specifically comprising the steps of:

3. The method for synchronizing a GNSS clock with low power consumption according to claim 1, wherein in the step of synchronizing the local clock with the corresponding clock and storing the linearly interpolated acquired data, the method specifically comprises the steps of:

4. The method according to claim 1, wherein when the state information is a locked state, the PPS second pulse signal is corrected with the local clock, and the collected data is linearly interpolated and then waits for entering a clock synchronization state of a next preset period.

5. The method for synchronizing the GNSS clock based on low power consumption according to claim 1, wherein when the state information is an unlocked state, the working mode is adjusted to a cyclic tracking mode with a preset period to search for satellite signals, and clock synchronization and storage of acquired data are performed again until the acquired state information is a locked state;

6. An apparatus based on a low power consumption GNSS clock synchronization method according to claim 1, comprising: the system comprises a GNSS module, a main control unit, an earthquake signal acquisition module, a storage module and a power supply module;

the GNSS module is used for acquiring the UBX data packet information;

the storage module is used for storing the acquired data;

The power module is used for providing energy.

7. The low-power consumption GNSS clock synchronization apparatus according to claim 6, wherein when the state information acquired by the GNSS module is an unlocked state, the master control unit sends an instruction to set the GNSS module to a preset period for clock synchronization;

8. An apparatus comprising a processor, a memory coupled to the processor, wherein the memory stores program instructions for implementing a low power GNSS clock synchronization method according to any of claims 1-5; the processor is configured to execute the program instructions stored in the memory to achieve a low power consumption based GNSS clock synchronization.

9. A storage medium having stored thereon program instructions executable by a processor for performing a low power GNSS clock based synchronization method according to any of the claims 1-5.