CN113726408B - Self-adaptive synchronization method for cooperative synchronization and self-synchronization of satellite load system - Google Patents
Self-adaptive synchronization method for cooperative synchronization and self-synchronization of satellite load system Download PDFInfo
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- CN113726408B CN113726408B CN202110982044.9A CN202110982044A CN113726408B CN 113726408 B CN113726408 B CN 113726408B CN 202110982044 A CN202110982044 A CN 202110982044A CN 113726408 B CN113726408 B CN 113726408B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/44—Star or tree networks
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a self-adaptive synchronization method for cooperative synchronization and self-synchronization of a satellite load system, and relates to the field of synchronization and self-adaptive control of a satellite communication system. The invention respectively synchronizes the time information and the PPS second pulse information, uses the processing mode of a star network to complete the diffusion process of synchronous signals from a central node to end nodes and complete the synchronization processes of the central node synchronization, the end nodes synchronization and the like, has different synchronization modes of system cooperative synchronization and self-synchronization, can realize self-adaptive switching, and meets the requirements of the stability and the reliability of the system; the invention is especially suitable for the working mode of high, medium and low orbit multi-constellation multi-network system mixed communication, and is also suitable for the synchronous system control of the satellite.
Description
Technical Field
The invention relates to a self-adaptive synchronization method for cooperative synchronization and self-synchronization of a satellite load system, which can be used for synchronous control of the satellite load system, has the self-adaptive characteristic of a synchronization mode, can meet the requirement of high reliability of the system, and belongs to the field of synchronization and self-adaptive control of satellite communication systems.
Background
Satellite communication has entered a rapid development period, and high-orbit satellite constellation communication, low-orbit satellite network system communication, and high/low satellite network system communication all require network-wide synchronization. Due to the limited control resources of the satellite, flexible switching between self-synchronization and cooperative synchronization of the satellite communication system is required. The autonomous synchronous system can be free from the interference of an external system and can independently operate; the cooperative synchronization system can perform heterogeneous network networking and perform large-scale network communication. The communication system based on self-synchronization and cooperative synchronization flexible switching can enable the anti-interference performance of a communication network to be stronger and better adapt to satellite communication in various environments.
Disclosure of Invention
The invention aims to solve the technical problem of avoiding the defects in the background art and provides a self-adaptive synchronization method for cooperative synchronization and self-synchronization of a satellite load system.
The technical scheme adopted by the invention is as follows:
a self-adaptive synchronization method for cooperative synchronization and self-synchronization of a satellite load system, wherein the satellite load system takes a central node as a center, and each end node is connected below the central node in parallel, comprises the following steps:
(1) when a satellite load system starts to work, a self-synchronization working mode is used in a self-adaptation mode to generate local time and local second pulse signals, and the local time and the local second pulse signals are used for self-synchronization;
(2) after the satellite navigation positioning is successful, the satellite load system is switched from a self-synchronization working mode to a cooperative synchronization mode, and the time information of the satellite navigation and the PPS second pulse signal are used for performing cooperative synchronization; and after the satellite navigation positioning fails, the satellite load system is switched to the self-synchronizing working mode again.
Wherein, the specific process of the step (1) is as follows:
when a central node of the satellite load system is started, the central node serves as a self-synchronizing source node, local time and local second pulse signals of the central node are generated and sent to all end nodes, and all the end nodes are synchronized to the local time and the local second pulse signals of the central node to complete self-synchronization of the satellite load system;
when the central node of the satellite load system is not started, the end node is started, the end node serves as a source node, local time and local second pulse signals of the end node are generated, and self-synchronization of the node is completed.
Wherein, the specific process of the step (2) is as follows:
(201) the central node receives time information and PPS second pulse information sent by satellite navigation, and judges whether the time information is effective, time information synchronization and second pulse synchronization;
(202) if the time information is effective, the time information is synchronous and the pulse per second is synchronous, the central node outputs the satellite navigation time information and the PPS pulse to the end node and works in cooperative synchronization; if the time information is invalid or the second pulse is not synchronous, the central node outputs local time and local second pulse generated by the central node to the end node and works in self-synchronization;
(203) the end node receives the time information and the pulse per second information of the central node and carries out effective time information and pulse per second synchronous judgment;
(204) if the time information is valid, the time information is synchronous and the second pulse is synchronous, the end node completes the cooperative synchronization; if the time information is invalid or the second pulse is not synchronous, the end node uses the local time and the local second pulse generated by the end node to complete self-synchronization.
The time information synchronous judgment comprises the following specific processes:
extracting UTC cumulative seconds from the time information when the time information is effective; continuously comparing the UTC accumulated seconds extracted each time, and continuously setting the UTC accumulated second difference 1 before and after the times to indicate that the UTC accumulated seconds are available to finish time information synchronization; the UTC accumulated second difference is not 1 before and after the continuous set times, which indicates that the time information synchronization fails.
The pulse per second synchronous judgment specifically comprises the following processes:
and counting the two adjacent pulse per second information by using a local clock, judging that the pulse per second synchronization is successful if the set counting range is met, and judging that the pulse per second synchronization is failed if the set counting range is not met.
Compared with the background art, the invention has the following advantages:
1. the invention supports the self-adaptive synchronization of the system cooperative synchronization and the self-synchronization;
2. the invention adopts the design method of the star network, the diffusion from the central node to the end node, the synchronization mode is simple, and the system is stable and reliable.
Drawings
Fig. 1 is a flow chart of the satellite loading system synchronization of the present invention.
Detailed Description
The invention will be further described with reference to fig. 1 and the following detailed description of the preferred embodiments.
A self-adaptive synchronization method for cooperative synchronization and self-synchronization of a satellite load system, wherein the satellite load system takes a central node as the center, and each end node is connected below the central node in parallel, comprises the following steps:
(1) when the satellite load system starts to work, a self-adaptive synchronous working mode is used for generating local time and local second pulse signals in a self-adaptive mode, and the local time and the local second pulse signals are used for self-synchronizing; the specific process is as follows:
when a central node of the satellite load system is started, the central node serves as a self-synchronizing source node, local time and local second pulse signals of the central node are generated and sent to all end nodes, and all the end nodes are synchronized to the local time and the local second pulse signals of the central node to complete self-synchronization of the satellite load system;
when the central node of the satellite load system is not started, the end node is started, the end node serves as a source node, local time and local second pulse signals of the end node are generated, and self-synchronization of the node is completed.
(2) After the satellite navigation positioning is successful, the satellite load system is switched from a self-synchronization working mode to a cooperative synchronization mode, and the time information of the satellite navigation and the PPS second pulse signal are used for performing cooperative synchronization; and after the satellite navigation positioning fails, the satellite load system is switched to the self-synchronizing working mode again. The specific process is as follows:
(201) the central node receives time information and PPS second pulse information sent by satellite navigation, and judges whether the time information is effective, time information synchronization and second pulse synchronization;
(202) if the time information is valid, the time information is synchronous and the second pulse is synchronous, the central node outputs the satellite navigation time information and the PPS second pulse to the end node and works in cooperative synchronization; if the time information is invalid or the second pulse is not synchronous, the central node outputs local time and local second pulse generated by the central node to the end node and works in self-synchronization;
(203) the end node receives the time information and the pulse per second information of the central node and carries out effective time information and pulse per second synchronous judgment;
(204) if the time information is valid, the time information is synchronous and the second pulse is synchronous, the end node completes the cooperative synchronization; if the time information is invalid or the second pulse is not synchronous, the end node uses the local time and the local second pulse generated by the end node to complete self-synchronization.
The time information synchronous judgment comprises the following specific processes:
extracting UTC cumulative seconds from the time information when the time information is effective; continuously comparing the UTC accumulated seconds analyzed each time, and continuously setting the UTC accumulated seconds difference of 1 before and after the times, wherein the UTC accumulated seconds are available, and time information synchronization is completed; the UTC accumulated second difference is not 1 before and after the continuous set times, which indicates that the time information synchronization fails.
The pulse per second synchronous judgment specifically comprises the following processes:
and counting the two adjacent pulse per second information by using the local clock, judging that the pulse per second synchronization is successful if the set counting range is met, and judging that the pulse per second synchronization is failed if the set counting range is not met.
The invention can carry out system synchronization in different modes in real time and in a self-adaptive manner according to actual conditions, and improves the stability and reliability of the satellite system while meeting the requirements of satellite communication and satellite load control.
Claims (3)
1. A self-adaptive synchronization method for cooperative synchronization and self-synchronization of a satellite load system is characterized in that the satellite load system takes a central node as the center, and each end node is connected below the central node in parallel, and the method specifically comprises the following steps:
(1) when the satellite load system starts to work, a self-adaptive synchronous working mode is used for generating local time and local second pulse signals in a self-adaptive mode, and the local time and the local second pulse signals are used for self-synchronizing;
(2) after the satellite navigation positioning is successful, the satellite load system is switched from a self-synchronization working mode to a cooperative synchronization mode, and the time information of the satellite navigation and the PPS second pulse signal are used for performing cooperative synchronization; after the satellite navigation positioning fails, the satellite load system is switched to a self-synchronizing working mode again;
wherein, the specific process of the step (1) is as follows:
when a central node of the satellite load system is started, the central node serves as a self-synchronizing source node, local time and local second pulse signals of the central node are generated and sent to all end nodes, and all the end nodes are synchronized to the local time and the local second pulse signals of the central node to complete self-synchronization of the satellite load system;
when a central node of the satellite load system is not started, the end nodes are started, the end nodes serve as source nodes to generate local time and local second pulse signals of the end nodes, and self-synchronization of the node is completed;
wherein, the specific process of the step (2) is as follows:
(201) the central node receives time information and PPS second pulse information sent by satellite navigation, and judges whether the time information is effective, time information synchronization and second pulse synchronization;
(202) if the time information is effective, the time information is synchronous and the pulse per second is synchronous, the central node outputs the satellite navigation time information and the PPS pulse to the end node and works in cooperative synchronization; if the time information is invalid or the second pulse is not synchronous, the central node outputs local time and local second pulse generated by the central node to the end node and works in self-synchronization;
(203) the end node receives the time information and the pulse per second information of the central node and carries out effective time information and pulse per second synchronous judgment;
(204) if the time information is valid, the time information is synchronous and the second pulse is synchronous, the end node completes the cooperative synchronization; if the time information is invalid or the second pulse is not synchronous, the end node uses the local time and the local second pulse generated by the end node to complete self-synchronization.
2. The adaptive synchronization method for cooperative synchronization and self-synchronization of a satellite load system according to claim 1, wherein the time information synchronization judgment specifically comprises the following steps:
extracting UTC cumulative seconds from the time information when the time information is effective; continuously comparing the UTC accumulated seconds extracted each time, and continuously setting the UTC accumulated second difference 1 before and after the times to indicate that the UTC accumulated seconds are available to finish time information synchronization; the UTC accumulated second difference is not 1 before and after the continuous set times, which indicates that the time information synchronization fails.
3. The adaptive synchronization method for cooperative synchronization and self-synchronization of a satellite load system according to claim 1, wherein the second pulse synchronization judgment specifically comprises the following steps:
and counting the two adjacent pulse per second information by using a local clock, judging that the pulse per second synchronization is successful if the set counting range is met, and judging that the pulse per second synchronization is failed if the set counting range is not met.
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|---|---|---|---|---|
| CN102882586A (en) * | 2012-10-15 | 2013-01-16 | 北京空间飞行器总体设计部 | Satellite time synchronization system |
| CN107655475A (en) * | 2017-11-03 | 2018-02-02 | 河南思维轨道交通技术研究院有限公司 | Synchronization pulse acquisition methods, navigation data synchronization processing method and system |
| CN111971584A (en) * | 2019-10-29 | 2020-11-20 | 中国科学院微小卫星创新研究院 | Navigation satellite time system and autonomous recovery method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AU2016347539B2 (en) * | 2015-10-30 | 2021-05-06 | Paris Michaels | Mobile satellite communication system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882586A (en) * | 2012-10-15 | 2013-01-16 | 北京空间飞行器总体设计部 | Satellite time synchronization system |
| CN107655475A (en) * | 2017-11-03 | 2018-02-02 | 河南思维轨道交通技术研究院有限公司 | Synchronization pulse acquisition methods, navigation data synchronization processing method and system |
| CN111971584A (en) * | 2019-10-29 | 2020-11-20 | 中国科学院微小卫星创新研究院 | Navigation satellite time system and autonomous recovery method thereof |
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