Time-frequency quantity transmission method and device applied to cco node in wideband power carrier hplc

Abstract

The application relates to the technical field of time-frequency quantity transmission, and particularly relates to a time-frequency quantity transmission method and device applied to a CCO node in wideband power carrier HPLC, which comprises a time-frequency common-view device, a CCO module and a first time management module, a 1PPS module and a time sending serial port, the output ends of the first time management module are connected with the 1PPS module and the first serial port respectively, the CCO module comprises a full-digital frequency adjustment module, a frequency receiving serial port, a time receiving serial port, a crystal oscillator module and a second time management module, the 1PPS module is connected with the second time management module through the frequency receiving serial port and the full-digital frequency adjustment module in sequence, and the time sending serial port is connected with the second time management module through the time receiving serial port. The application guarantees the accuracy of the input time-frequency signal of the CCO module through the time-frequency common-view device, and guarantees the accuracy of the frequency quantity transmission through the full-digital frequency adjustment module.

Description

Technical Field

[0001] This invention relates to the field of time-frequency measurement technology, and specifically to a time-frequency measurement method and apparatus applied to the CCO node in broadband power line carrier HPLC. Background Technology

[0002] For short-distance data transfer between time-frequency nodes, several methods are generally used, including IRIG-B, fiber optic pulse, serial port, and TTL level. Currently, in power line carrier HPLC communication, time synchronization of the CCO node is mainly achieved through a serial port connected to the concentrator, while the concentrator's time synchronization is primarily achieved by the acquisition master station via wireless communication. Figure 2 (As shown). Patent "A Precise Clock Synchronization Method and Device for Power Distribution Area Networks Based on HPLC", publication number CN202210275304, utilizes a master acquisition station to perform real-time time synchronization of CCO nodes via a remote communication network. This synchronization method first uses a wireless communication network to synchronize the concentrator's time, and then the concentrator performs one-way broadcast time synchronization of the CCO nodes via a serial port. Patent "A Clock Synchronization Method for Low-Voltage Distribution Area Acquisition Equipment Based on HPLC Carrier Communication", publication number CN202010037277, proposes a method for precise clock synchronization from a concentrator to the CCO module. The concentrator sends a millisecond unit time synchronization command to the CCO module via a serial port, and achieves millisecond unit clock synchronization by outputting a hardware second pulse signal to the CCO module.

[0003] Currently, time synchronization of the CCO node in power line carrier HPLC communication is mainly achieved through a serial port connected to the concentrator. However, on the one hand, the concentrator's time is achieved through a wireless communication network. Due to the uncertainty of the delay in the master station scheduling and the wireless communication network, the concentrator's time accuracy is not high, around 30 seconds, which cannot complete the function of high-precision time transmission. On the other hand, the current solution only performs time synchronization from the concentrator to the CCO module, without frequency synchronization design, so it cannot complete the high-precision frequency transmission of the CCO. Summary of the Invention

[0004] This invention addresses the problems of low accuracy in time and frequency measurement at the CCO node in power line carrier HPLC, which lacks frequency measurement. It proposes a time-frequency measurement method and apparatus for CCO nodes in broadband power line carrier HPLC. By using a time-frequency common-view device to provide a high-precision time and frequency reference for the CCO, and by adding a fully digital frequency adjustment module to the CCO, local frequency correction is performed using the frequency of the time-frequency common-view node, thus achieving high-precision time-frequency measurement for the CCO module. This provides a foundation for time-frequency measurement of all STAs within a power line cluster.

[0005] This invention is achieved through the following technical solution:

[0006] A time-frequency measurement device for use at the CCO node in broadband power line carrier HPLC, comprising:

[0007] A time-frequency co-view device is used to output time-frequency data transmission input information, which includes standard time information and frequency information;

[0008] The CCO module is used to receive the time-frequency data transmission input information to complete the time-frequency data transmission process.

[0009] As an optimization, the time-frequency co-viewing device includes a first time management module for managing and sending standard time information, a 1PPS module for outputting frequency information, and a time transmission serial port for outputting standard time information. The output terminal of the first time management module is connected to the 1PPS module and the first serial port, respectively.

[0010] The CCO module includes a fully digital frequency adjustment module for frequency transmission, a frequency receiving serial port for receiving frequency information, a time receiving serial port for receiving standard time information, a crystal oscillator module for outputting local raw frequency signals to the fully digital frequency adjustment module, and a second time management module for time transmission. The 1PPS module is connected to the second time management module in sequence through the frequency receiving serial port, the fully digital frequency adjustment module, and the time transmitting serial port is connected to the second time management module through the time receiving serial port. The output terminal of the crystal oscillator module is connected to the fully digital frequency adjustment module.

[0011] As an optimization, the all-digital frequency adjustment module includes a phase detector, a divide-by-N counter, a K-mode reversible counter, and a pulse adder / subtractor. One input terminal of the phase detector is connected to the 1PPS module through the frequency receiving serial port, and the other input terminal of the phase detector is connected to the divide-by-N counter. The output terminal of the phase detector is connected to the input terminal of the divide-by-N counter in sequence through the K-mode reversible counter and the pulse adder / subtractor. The other input terminal of the pulse adder / subtractor is connected to the output terminal of the crystal oscillator module, and the other output terminal of the pulse adder / subtractor is connected to the second time management module.

[0012] This invention also discloses a time-frequency measurement method for a CCO node in broadband power line carrier HPLC, utilizing the aforementioned time-frequency measurement device for a CCO node in broadband power line carrier HPLC, comprising:

[0013] The time and frequency information of the time-frequency co-view device are transmitted to the CCO module as time-frequency data transmission input information.

[0014] Frequency transmission is completed through the frequency information transmitted between the fully digital frequency adjustment module in the CCO module and the 1PPS module.

[0015] The second time management module utilizes the frequency and time information from the 1PPS module to complete time data transmission.

[0016] As an optimization, the frequency information is a 1PPS pulse signal.

[0017] As an optimization, the time information is serial port ToD information.

[0018] As an optimization, the specific process of frequency transmission via the 1PPS pulse signal transmitted from the all-digital frequency adjustment module and the 1PPS module is as follows:

[0019] A1. The phase detector receives the 1PPS pulse signal transmitted from the 1PPS module and the internal feedback signal Fb to obtain the frequency difference between the 1PPS pulse signal and the internal feedback signal Fb.

[0020] A2. Output the frequency difference between the 1PPS pulse signal and the internal feedback signal Fb to the K variable-mode reversible counter to obtain the first result;

[0021] A3. Output the first result to the pulse adder / subtractor to obtain the second result;

[0022] A4. Output the second result to the divide-N counter to generate a feedback signal Fb, which is then fed back to the phase detector.

[0023] A5. Determine whether the feedback signal Fb and the 1PPS pulse signal are in phase. If they are not in phase, return to A1. If they are in phase, jump to A6.

[0024] A6. The pulse adder / subtractor outputs a second result Fc that is in phase with 1PPS, thereby enabling the second result Fc to trace the frequency of the 1PPS signal and complete the frequency transmission process.

[0025] As an optimization, the specific process of completing time data transmission using the frequency and time information of the 1PPS module through the second time management module is as follows:

[0026] B1. The second time management module latches the CCO local time T1 at the falling edge of each 1PPS pulse signal;

[0027] B2. The ToD information T2 corresponding to the falling edge of the aforementioned 1PPS pulse signal will be stored at the subsequent arrival time of the ToD information.

[0028] B3. Compare the latched CCO local time T1 and the serial port time information T2, calculate the correction value Te of the CCO local time, then for any original CCO local time T, the accurate time is Tc = T - Te.

[0029] As an optimization, the correction value Te for the local time of CCO is specifically: Te = T1 - T2.

[0030] As an optimization, the time-frequency co-viewing device is a satellite co-viewing terminal.

[0031] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0032] This invention implements the solution from the perspectives of time-frequency data transmission information input and the time-frequency data transmission process. It ensures the accuracy of the time-frequency signal input to the CCO module through a time-frequency co-view device, guarantees the accuracy of frequency data transmission through a fully digital frequency adjustment module, and ensures the accuracy of time data transmission by using a second time management module to control the timing of the time correction process using 1PPS signals and serial port ToD information. The entire method and device guarantee high-precision time-frequency data transmission to the CCO module, with time accuracy down to 100ns and frequency accuracy down to 0.1ppm, laying the foundation for subsequent time-frequency data transmission from the STA module to the distribution unit cluster via carrier wave. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0034] Figure 1 This is a structural diagram of a time-frequency measurement device applied to the CCO node in broadband power line carrier HPLC according to the present invention.

[0035] Figure 2 The diagram shows the existing structure of the CCO time synchronization method in the distribution area.

[0036] Figure 3 This is a schematic diagram of the all-digital frequency adjustment module in this invention;

[0037] Figure 4 This is a schematic diagram of the time synchronization timing of a time-frequency data transfer method applied to the CCO node in broadband power line carrier HPLC according to the present invention.

[0038] 1-Time and frequency co-viewing device, 1a-First time management module, 1b-1PPS module, 1c-Time transmission serial port, 2-CCO module, 2a-Time reception serial port, 2b-Frequency reception serial port, 2c-All-digital frequency adjustment module, 2c1-Phase detector, 2c2-K-modulus reversible counter, 2c3-Pulse adder / subtractor, 2c4-Division by N counter, 2d-Crystal oscillator module, 2e-Second time management module Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0040] Currently, for CCO nodes in power line carrier HPLC communication, since they were previously mainly used for communication functions, the focus of the system was on time and frequency synchronization between STA and CCO. However, the absolute time and frequency of the CCO itself only had requirements for short time scales, not for long time scales, which limited the use of power line carrier HPLC technology for wide-area time and frequency value transfer.

[0041] Therefore, based on the current implementation scheme of the CCO module in power line carrier HPLC, this invention has made two design modifications: first, adding a time-frequency co-viewing device to ensure the accuracy of the input time-frequency signal of the CCO module; second, adding a 1PPS input interface and a fully digital frequency adjustment module to the CCO module, and completing the frequency transmission through the fully digital frequency adjustment module and the 1PPS signal; and third, adding a timing control function that uses serial port time and 1PPS pulse for time synchronization to the time management module of the CCO module to complete the time transmission function of the CCO device.

[0042] The invention will now be described in detail.

[0043] Example 1

[0044] like Figure 1 As shown, a time-frequency measurement device for use at the CCO node in broadband power line carrier HPLC includes:

[0045] The time-frequency co-viewing device 1 is used to output time-frequency data transmission input information, which includes standard time information and frequency information. Specifically, it includes a first time management module 1a for managing and sending standard time information, a 1PPS module 1b for outputting frequency information, and a time transmission serial port 1c for outputting standard time information. The output of the first time management module 1a is connected to the 1PPS module 1b and the first serial port, respectively. In this embodiment, the time-frequency co-viewing device 1 is a satellite co-viewing terminal.

[0046] CCO module 2 is used to receive the time-frequency transmission input information to complete the time-frequency transmission process. Specifically, it includes a fully digital frequency adjustment module 2c for completing frequency transmission, a frequency receiving serial port 2b for receiving frequency information, a time receiving serial port 2a for receiving standard time information, a crystal oscillator module 2d for outputting local raw frequency signals to the fully digital frequency adjustment module, and a second time management module 2e for completing time transmission. The 1PPS module 1b is connected to the second time management module 2e in sequence through the frequency receiving serial port 2b, the fully digital frequency adjustment module 2c, and the time transmitting serial port 1c is connected to the second time management module 2e through the time receiving serial port 2a. The output terminal of the crystal oscillator module 2d is connected to the fully digital frequency adjustment module 2c.

[0047] like Figure 3 As shown, in this embodiment, the all-digital frequency adjustment module 2c includes a phase detector 2c1, a divide-by-N counter 2c4, a K-mode reversible counter 2c2, and a pulse adder / subtractor 2c3. One input terminal of the phase detector 2c1 is connected to the 1PPS module 1b through the frequency receiving serial port 2b, and the other input terminal of the phase detector 2c1 is connected to the divide-by-N counter 2c4. The output terminal of the phase detector 2c1 is connected to the input terminal of the divide-by-N counter 2c4 through the K-mode reversible counter 2c2 and the pulse adder / subtractor 2c3 in sequence. The other input terminal of the pulse adder / subtractor 2c3 is connected to the output terminal of the crystal oscillator module 2d, and the other output terminal of the pulse adder / subtractor 2c3 is connected to the second time management module 2e.

[0048] Example 2

[0049] This invention also discloses a time-frequency measurement method for CCO nodes in broadband power line carrier HPLC. Utilizing the aforementioned time-frequency measurement device for CCO nodes in broadband power line carrier HPLC, a fully digital frequency adjustment module 2c is first added to the CCO module 2. The local frequency is frequency-locked and adjusted using the 1PPS pulse signal output from the satellite common-view terminal, thus completing frequency measurement. Time is precisely synchronized using the serial port ToD signal and the 1PPS pulse signal output from the satellite common-view terminal, thus completing time measurement.

[0050] The specific process is as follows:

[0051] The first time management module manages and sends standard time information to the 1PPS module and the time transmission serial port, and transmits the time information (i.e., serial port ToD information) and frequency information (i.e., 1PPS pulse signal) of the time and frequency co-view device 1 as time and frequency quantity transmission input information to the CCO module 2.

[0052] Frequency transmission is completed by transmitting frequency information from the all-digital frequency adjustment module 2c in the CCO module 2 and the 1PPS module 1b.

[0053] Specifically, the crystal oscillator module outputs the local raw frequency signal to the pulse adder / subtractor in the all-digital frequency adjustment module. The divide-by-N counter divides the input count value by N. The K variable-mode reversible counter uses the output of the phase detector as the direction pulse and outputs the add / subtract pulse signal. The pulse adder / subtractor adds or subtracts the count value based on the output of the K variable-mode reversible counter.

[0054] In this embodiment, as Figure 3 As shown, the specific process of frequency transmission via the 1PPS pulse signal transmitted from the all-digital frequency adjustment module 2c and the 1PPS module 1b is as follows:

[0055] A1. Phase detector 2c1 receives the 1PPS pulse signal transmitted from 1PPS module 1b and the internal feedback signal Fb to obtain the frequency difference between the 1PPS pulse signal and the internal feedback signal Fb.

[0056] A2. The frequency difference between the 1PPS pulse signal and the internal feedback signal Fb is output to the K variable mode reversible counter 2C2 to obtain the first result; the 1PPS pulse signal is transmitted through the input frequency and enters the phase detector 2c1 together with the internal feedback signal Fb. The phase detector 2c1 outputs the frequency difference between the two and controls the K variable mode reversible counter 2C2 to obtain the first result.

[0057] A3. Output the first result to the pulse adder / subtractor 2c3 to obtain the second result; control the pulse adder / subtractor 2c3 with the first result output by the K variable-mode reversible counter 2C2 to obtain the second result.

[0058] A4. The second result is output to the divide-by-N counter 2c4 to generate a feedback signal Fb, which is then fed back to the phase detector 2c1; the second result output by the pulse adder / subtractor 2c3 is also output to the divide-by-N counter 2c4 to generate a feedback signal Fb, which is then fed back to the phase detector 2c1.

[0059] A5. Determine whether the feedback signal Fb and the 1PPS pulse signal are in phase. If they are not in phase, return to A1. If they are in phase, jump to A6.

[0060] A6. The pulse adder / subtractor 2c3 outputs a second result Fc that is in phase with 1PPS, thereby enabling the second result Fc to trace the frequency of the 1PPS signal and complete the frequency transmission process.

[0061] The second time management module 2e utilizes the frequency and time information of the 1PPS module 1b to complete the time data transmission.

[0062] In this embodiment, the specific process of completing time data transmission using the frequency and time information of the 1PPS module 1b through the second time management module 2e is as follows:

[0063] B1. The second time management module 2e latches the local time T1 of CCO at the falling edge of each 1PPS pulse signal;

[0064] B2. The ToD information T2 corresponding to the falling edge of the aforementioned 1PPS pulse signal will be stored at the subsequent arrival time of the ToD information.

[0065] B3. Compare the latched CCO local time T1 and the serial port time information T2, and calculate the correction value of the CCO local time Te = T1 - T2. Then, for any CCO local original time T, the accurate time is Tc = T - Te.

[0066] The second time management module 2e of CCO module 2 operates at each 1PPS pulse falling edge, i.e. Figure 4 At time ①, the local CCO time T1 is latched, and at the subsequent time ②, the serial port Tod information T2 corresponding to the 1PPS pulse at time ① is stored. By comparing the local CCO latch time T1 and the serial port Tod information T2, the correction value Te = T1 - T2 of the local CCO time is calculated. Then, for any original local CCO time T, the accurate time is Tc = T - Te.

[0067] The English abbreviations in this invention correspond to:

[0068] HPLC: High-speed Power Line Broadband Carrier

[0069] PPS: Pulse Per Second

[0070] CCO: Central Coordinator

[0071] STA: Station

[0072] ToD: Current Time (Time of Day)

[0073] NTP: Network Time Protocol

[0074] PTP: Precise Time Protocol

[0075] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0076] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0077] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0078] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0079] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0080] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A time-frequency measurement device applied to the CCO node in broadband power line carrier HPLC, characterized in that, include: A time-frequency co-view device is used to output time-frequency data transmission input information, which includes standard time information and frequency information; The CCO module is used to receive the time-frequency data transmission input information to complete the time-frequency data transmission process. The CCO module is a concentrator module. The time-frequency co-viewing device includes a first time management module for managing and sending standard time information, a 1PPS module for outputting frequency information, and a time transmission serial port for outputting standard time information. The output terminal of the first time management module is connected to the 1PPS module and the time transmission serial port, respectively. The CCO module includes a fully digital frequency adjustment module for frequency transmission, a frequency receiving serial port for receiving frequency information, a time receiving serial port for receiving standard time information, a crystal oscillator module for outputting local raw frequency signals to the fully digital frequency adjustment module, and a second time management module for time transmission. The 1PPS module is connected to the second time management module in sequence through the frequency receiving serial port, the fully digital frequency adjustment module, and the time transmitting serial port is connected to the second time management module through the time receiving serial port. The output terminal of the crystal oscillator module is connected to the fully digital frequency adjustment module. The all-digital frequency adjustment module includes a phase detector, a divide-by-N counter, a K-mode reversible counter, and a pulse adder / subtractor. One input of the phase detector is connected to the 1PPS module via the frequency receiving serial port, and the other input is connected to the divide-by-N counter. The output of the phase detector is connected to the input of the divide-by-N counter via the K-mode reversible counter and the pulse adder / subtractor. The other input of the pulse adder / subtractor is connected to the output of the crystal oscillator module, and the other output is connected to the second time management module.

2. A time-frequency measurement method applied to the CCO node in broadband power line carrier HPLC, characterized in that, include: The time and frequency information of the time-frequency co-view device are transmitted to the CCO module as time-frequency data transmission input information. Frequency transmission is completed through the frequency information transmitted between the fully digital frequency adjustment module in the CCO module and the 1PPS module. The specific process is as follows: A1. The phase detector receives the 1PPS pulse signal transmitted from the 1PPS module and the internal feedback signal Fb to obtain the frequency difference between the 1PPS pulse signal and the internal feedback signal Fb. A2. Output the frequency difference between the 1PPS pulse signal and the internal feedback signal Fb to the K variable-mode reversible counter to obtain the first result; A3. Output the first result to the pulse adder / subtractor to obtain the second result; A4. Output the second result to the divide-N counter to generate a feedback signal Fb, which is then fed back to the phase detector. A5. Determine whether the feedback signal Fb and the 1PPS pulse signal are in phase. If they are not in phase, return to A1. If they are in phase, jump to A6. A6. The pulse adder / subtractor outputs a second result Fc that is in phase with 1PPS, thereby enabling the second result Fc to trace the frequency of the 1PPS signal and complete the frequency transmission process. The second time management module uses the frequency and time information of the 1PPS module to complete the time data transmission, where the time information is serial port ToD information. The specific process is as follows: B1. The second time management module latches the CCO local time T1 at the falling edge of each 1PPS pulse signal; B2. When the subsequent ToD information arrives, the serial port ToD information T2 corresponding to the falling edge of the aforementioned 1PPS pulse signal will be stored, where ToD is a timestamp. B3. Compare the latched CCO local time T1 with the serial port ToD information T2, calculate the correction value Te of the CCO local time, then for any CCO local original time T, the accurate time is Tc=T-Te.

3. The time-frequency measurement method applied to the CCO node in broadband power line carrier HPLC according to claim 2, characterized in that, The frequency information is a 1PPS pulse signal.

4. The time-frequency measurement method applied to the CCO node in broadband power line carrier HPLC according to claim 2, characterized in that, The correction value Te for the local time of CCO is specifically: Te = T1 - T2.

5. The time-frequency measurement method applied to the CCO node in broadband power line carrier HPLC according to claim 2, characterized in that, The time-frequency co-viewing device is a satellite co-viewing terminal.

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