CN111082888B - Marine distributed optical fiber time service system - Google Patents
Marine distributed optical fiber time service system Download PDFInfo
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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
- H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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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
- H04J3/0644—External master-clock
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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
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/08—Intermediate station arrangements, e.g. for branching, for tapping-off
- H04J3/085—Intermediate station arrangements, e.g. for branching, for tapping-off for ring networks, e.g. SDH/SONET rings, self-healing rings, meashed SDH/SONET networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1652—Optical Transport Network [OTN]
- H04J3/1664—Optical Transport Network [OTN] carrying hybrid payloads, e.g. different types of packets or carrying frames and packets in the paylaod
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Abstract
The invention discloses a distributed optical fiber time service system for ships, which comprises: the system comprises a time-frequency host and a plurality of time-frequency extension sets; the time-frequency host comprises a power module, a time-frequency control module, a power-off time keeping module, a multi-reference-source processing module, a time frequency generation module, a display control module and an optical fiber module, wherein the power-off time keeping module, the multi-reference-source processing module, the time frequency generation module, the display control module and the optical fiber module are connected with the time-frequency control module; the time-frequency extension set comprises a power module, a time-frequency control module, a time-frequency generation module and an optical fiber module, wherein the time-frequency generation module and the optical fiber module are connected with the time-frequency control module; the time-frequency host and the time-frequency extension sets are connected through respective optical fiber modules by adopting two optical fiber cables to form a time-frequency cascade loop. The invention provides a time-frequency homologous clock by forming a time-frequency cascade loop by the time-frequency host and the time-frequency extension, realizes a uniform interface of time-frequency equipment, and uniformly monitors and manages.
Description
Technical Field
The invention relates to the technical field of marine communication, in particular to a marine distributed optical fiber time service system.
Background
With the development of national economy and national defense construction in China, more and more industries have high requirements on the precision of time frequency. The time system equipment is a high-precision electronic equipment capable of providing standard time frequency signals for the system, and all the equipment in the system can work under a uniform time reference. The existing time-frequency equipment for ships has various problems of various types, poor interface compatibility, lack of unified monitoring management and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at various problems of various types, poor interface compatibility, lack of unified monitoring management and the like of the existing marine time-frequency equipment, the marine distributed optical fiber time service system is provided.
The technical scheme adopted by the invention is as follows:
a distributed optical fiber time service system for ships comprises: the system comprises a time-frequency host and a plurality of time-frequency extension sets;
the time-frequency host comprises a power module, a time-frequency control module, a power-off time keeping module, a multi-reference-source processing module, a time frequency generation module, a display control module and an optical fiber module, wherein the power-off time keeping module, the multi-reference-source processing module, the time frequency generation module, the display control module and the optical fiber module are connected with the time-frequency control module;
the time-frequency extension set comprises a power module, a time-frequency control module, a time-frequency generation module and an optical fiber module, wherein the time-frequency generation module and the optical fiber module are connected with the time-frequency control module;
the time-frequency host and the time-frequency extension sets are connected through respective optical fiber modules by adopting two paths of optical fiber cables to form a time-frequency cascade loop; the time frequency host is used for outputting time frequency signals and transmitting the time frequency signals to the time frequency extension set through the time frequency cascade loop, and the time frequency extension set recovers the time frequency signals output by the time frequency host and uses the time frequency signals as time frequency references of the time frequency extension set, so that the time frequency references of all the time frequency hosts and the time frequency extension set are the same source clock.
Furthermore, the multi-reference source processing module comprises a reference source input module, a time-frequency analysis module and a reference source selection module which are connected in sequence;
the reference source input module is used for receiving various reference sources;
the time-frequency analysis module is used for analyzing the received time information of various reference sources;
and the reference source selection module is used for selecting a reference source with the optimal signal quality from the received multiple reference sources as the current reference source by comparing the received time information of the multiple reference sources with the phase discrimination value of the local clock.
Further, the power supply module includes: the device comprises an AC/DC conversion module for connecting a 220V alternating current power supply, a DC/DC conversion module for connecting a 48V direct current power supply, a power supply combining module, a voltage conversion module, a standby battery and a power supply switching module; the power module supplies power to other modules in the time-frequency host and the time-frequency extension set, and supplies power to an external power supply or a standby battery of a dual rubidium clock in the power-off timekeeping module:
(1) other modules supply power: the output ends of the AC/DC conversion module and the DC/DC conversion module are connected with the voltage conversion module, and the voltage conversion module converts the voltage into the voltage required by other modules in the time-frequency host and the time-frequency extension set and then supplies power;
(2) the dual rubidium clock is powered by an external power supply: the output ends of the AC/DC conversion module and the DC/DC conversion module are connected to the power supply switching module through the power supply combining module;
(3) a dual rubidium clock supplies power by a standby battery: the standby battery is connected to the power supply switching module;
the output end of the power supply switching module is connected with the dual rubidium clock in the power-off timekeeping module, and the dual rubidium clock in the power-off timekeeping module is controlled by the power supply switching module to supply power to an external power supply or a standby battery.
Furthermore, the power-off timekeeping module comprises a dual rubidium clock, a phase discriminator, a CPU and a memory, wherein the CPU is connected to the power supply switching module of the power supply module; the phase discriminator performs real-time phase discrimination on the reference source 1PPS and the 2-way rubidium clock 1PPS output by the dual rubidium clock, and stores a phase discrimination value to a memory; when the time-frequency host is powered off, the CPU controls the power supply switching module to switch the power supply of an external power supply of the dual rubidium clock to the power supply of the standby battery, and meanwhile, the phase of the output reference source 1PPS is maintained by means of the retention characteristic of the dual rubidium clock; when the time-frequency host is electrified again, the CPU controls the power supply switching module to switch the power supply of the backup battery of the dual rubidium clock to the power supply of an external power supply, and meanwhile, the CPU compensates the phase of the output reference source 1PPS according to the phase discrimination values of the reference source 1PPS and the 2-way rubidium clock 1PPS which are stored in the memory before power failure.
Further, the time frequency control module comprises:
the rubidium clock control module is used for performing parallel control on the dual rubidium clocks in the dual rubidium clock power-off time keeping module and performing frequency modulation, phase modulation and interlocking on 2 paths of rubidium clock 1PPS output by the dual rubidium clocks;
the core time processing module is used for generating a local time by using a local clock as the core time, when each external reference source is effective, calibrating and adjusting the phase of the core time by using the reference source as a reference, and outputting decimal seconds;
the battery management module is used for monitoring the temperature and the electric quantity of the standby battery in the power supply module and controlling the charging circuit to charge the standby battery when the electric quantity is lower than a threshold value;
and the communication module is used for realizing data interaction between the time-frequency control module and the power-off time-keeping module, the multi-reference-source processing module, the time-frequency generation module, the display control module and the optical fiber module.
Further, the time frequency generation module includes:
the time signal generating module is used for coding the analyzed reference source 1PPS and generating various time signals of 1PPS + TOD, DCLSD and NTP;
and the frequency signal generation module is used for performing phase locking on the local clock serving as a frequency reference through a PLL and a high-stability crystal oscillator and generating frequency signals of all frequency points through a DDS frequency synthesis technology.
Furthermore, the display control module is used for connecting a display to realize real-time display of state information and corresponding operation control;
the real-time display state information comprises a reference source state, a time signal, a frequency signal, a time-frequency host and a time-frequency extension state;
the corresponding operation control comprises the equipment running mode and the switching operation of working parameters of the time-frequency host and the time-frequency extension, and the working log of the equipment is recorded.
Further, the optical fiber module includes a switch, and 2 uplink optical interfaces and 2 downlink optical interfaces connected to the switch; two paths of optical fiber cables are adopted between the optical fiber modules of the time-frequency host and the time-frequency extension, and a time-frequency cascade loop is in butt joint through an uplink optical interface and a downlink optical interface; the change-over switch is used for realizing the automatic switching of the uplink optical interface and the downlink optical interface by monitoring the optical interface states of the 2 uplink optical interfaces and the 2 downlink optical interfaces.
Further, the optical fiber module further comprises an optical fiber protocol processing module; the optical fiber protocol processing module comprises:
the scheduling data frame processing module is used for switching the uplink communication link to the local connection machine when the scheduling command sent by the time-frequency host machine received by the time-frequency machine belongs to the condition that the uplink communication link needs to be established with the time-frequency host machine, otherwise, the uplink communication link continues to forward the uplink data of the lower-level time-frequency extension machine;
the processing module of the synchronous data frame is used for realizing time synchronization between the time-frequency extension set and the time-frequency host, the initiator of the time-frequency synchronization request frame is the time-frequency extension set, and the time-frequency host replies a time synchronization response frame in real time after receiving the time-frequency extension set time synchronization request frame; after an uplink communication link between the time frequency divider and the time frequency host is established, the extension set firstly sends a time synchronization request frame and then starts to execute other communication;
and the communication data frame and link data frame processing module is used for providing a sending channel for the communication data frame and the link data frame, is internally provided with a cache space and is used for caching the frame type, the payload data length and the payload data filled by software.
Preferably, the time-frequency host comprises a main time-frequency host and a standby time-frequency host.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention provides a time-frequency homologous clock by forming a time-frequency cascade loop by the time-frequency host and the time-frequency extension, realizes a uniform interface of time-frequency equipment, and uniformly monitors and manages.
2. The invention ensures the phase of the reference source output by the system through the power-off time-keeping module.
3. The invention ensures that the system output is not interrupted when a single node fails through the optical fiber module.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a structural block diagram of a distributed optical fiber time service system for a ship of the invention.
FIG. 2 is a block diagram of a multi-reference source processing module according to the present invention.
Fig. 3 is a block diagram of the power module according to the present invention.
FIG. 4 is a block diagram of the power-off time-keeping module of the present invention
Fig. 5 is a block diagram of a time-frequency control module according to the present invention.
Fig. 6 is a block diagram of a time-frequency generation module according to the present invention.
Fig. 7 is a structural block diagram of the display control module of the present invention.
Fig. 8 is a block diagram of a fiber optic module of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, a distributed optical fiber time service system for a ship includes: the system comprises a time-frequency host and a plurality of time-frequency extension sets; in order to improve system stability, the time-frequency host of this embodiment includes a main time-frequency host and a standby time-frequency host, and when one of the time-frequency hosts fails, the other time-frequency host may be used to continue working;
the time-frequency host comprises a power module, a time-frequency control module, a power-off time keeping module, a multi-reference-source processing module, a time frequency generation module, a display control module and an optical fiber module, wherein the power-off time keeping module, the multi-reference-source processing module, the time frequency generation module, the display control module and the optical fiber module are connected with the time-frequency control module;
the time-frequency extension set comprises a power module, a time-frequency control module, a time-frequency generation module and an optical fiber module, wherein the time-frequency generation module and the optical fiber module are connected with the time-frequency control module;
the time-frequency host and the time-frequency extension sets are connected through respective optical fiber modules by adopting two paths of optical fiber cables to form a time-frequency cascade loop; the time frequency host is used for outputting time frequency signals and transmitting the time frequency signals to the time frequency extension set through the time frequency cascade loop, and the time frequency extension set recovers the time frequency signals output by the time frequency host and uses the time frequency signals as time frequency references of the time frequency extension set, so that the time frequency references of all the time frequency hosts and the time frequency extension set are the same source clock.
The time frequency control module, the time frequency generation module, the optical fiber module and the power module are universal in the time frequency host and the time frequency extension.
The following detailed description is made of each functional module in the time-frequency host and the time-frequency extension set:
(1) multi-reference source processing module
As shown in fig. 2, the multi-reference source processing module includes a reference source input module, a time-frequency analysis module, and a reference source selection module, which are connected in sequence;
the reference source input module is used for receiving various reference sources; the multiple reference sources received by the reference source input module comprise multiple reference sources in Beidou, GPS/Glonass, short wave and B code (DC).
The time-frequency analysis module is used for analyzing the received time information of various reference sources;
and the reference source selection module is used for selecting a reference source with the optimal signal quality from the received multiple reference sources as the current reference source by comparing the received time information of the multiple reference sources with the phase discrimination value of the local clock.
(2) Power supply module
As shown in fig. 3, the power module includes: the device comprises an AC/DC conversion module for connecting a 220V alternating current power supply, a DC/DC conversion module for connecting a 48V direct current power supply, a power supply combining module, a voltage conversion module, a standby battery and a power supply switching module; the power module supplies power to other modules in the time-frequency host and the time-frequency extension set, and supplies power to an external power supply or a standby battery of a dual rubidium clock in the power-off timekeeping module:
(1) other modules supply power: the output ends of the AC/DC conversion module and the DC/DC conversion module are connected with the voltage conversion module, and the voltage conversion module converts the voltage into the voltage required by other modules in the time-frequency host and the time-frequency extension set and then supplies power;
(2) the dual rubidium clock is powered by an external power supply: the output ends of the AC/DC conversion module and the DC/DC conversion module are connected to the power supply switching module through the power supply combining module;
(3) a dual rubidium clock supplies power by a standby battery: the standby battery is connected to the power supply switching module;
the output end of the power supply switching module is connected with the dual rubidium clock in the power-off timekeeping module, and the dual rubidium clock in the power-off timekeeping module is controlled by the power supply switching module to supply power to an external power supply or a standby battery.
Namely, the power module adopts double-path input of alternating current 220V and direct current 48V, and the alternating current 220V and the direct current 48V are respectively converted into 24V through the AC/DC conversion module and the DC/DC conversion module to supply power to the time-frequency host and other modules in the time-frequency extension set.
When the external alternating current 220V and the direct current 48V are normally input, the alternating current 220V is preferentially used for supplying power;
when the alternating current 220V fails, the direct current 48V power supply is switched;
when both the AC 220V and the DC 48V fail, the dual rubidium clock is powered by the backup battery.
(3) Power-off time keeping module
As shown in fig. 4, the power-off timekeeping module includes a dual rubidium clock, a phase discriminator, a CPU, and a memory, and the CPU is connected to the power supply switching module of the power supply module; the phase discriminator performs real-time phase discrimination on the reference source 1PPS and the 2-way rubidium clock 1PPS output by the dual rubidium clock, and stores a phase discrimination value to a memory;
when the time-frequency host is powered off (namely, when the alternating current 220V and the direct current 48V are both failed), the CPU controls the power supply switching module to switch the power supply of the external power supply of the dual rubidium clock to the power supply of the standby battery, and meanwhile, the phase of the output reference source 1PPS is maintained by means of the retention characteristic of the dual rubidium clock;
when the time-frequency host is electrified again (namely, the external alternating current 220V or the direct current 48V is input normally again), the CPU controls the power supply switching module to switch the power supply of the dual rubidium clock standby battery to the power supply of the external power supply, and meanwhile, the CPU compensates the phase of the output reference source 1PPS according to the reference source 1PPS stored to the memory before power failure and the phase discrimination value of the 2-way rubidium clock 1 PPS.
That is, after the time-frequency host is powered off and powered on again, the 1PPS phase thereof is a random value. To obtain a more accurate phase, the reference source needs to be tracked again for a longer time. Through the power-off time-keeping module of the system, when equipment normally tracks a reference source, a CPU regularly records and stores a phase discrimination value (phase difference) between a dual rubidium clock and the reference source; when the time-frequency host is powered off, the standby battery supplies power to the dual rubidium clock when the equipment is powered off, so that the dual rubidium clock is guaranteed to supply power uninterruptedly, and the phase of 1PPS is maintained by means of the retention characteristic of the rubidium clock; after the time-frequency host is powered on again, the CPU compensates the phase of the output 1PPS according to the phase difference stored before power failure, so that the phase of the 1PPS can be quickly close to the reference phase, and the method is particularly suitable for application occasions needing quick emergency call and the like.
(4) Time frequency control module
As shown in fig. 5, the time-frequency control module includes:
the rubidium clock control module is used for performing parallel control on the dual rubidium clocks in the dual rubidium clock power-off time keeping module and performing frequency modulation, phase modulation and interlocking on 2 paths of rubidium clock 1PPS output by the dual rubidium clocks; the dual rubidium clock is characterized in that two identical rubidium clocks are adopted, therefore, the rubidium clock control module adopts two identical and independent rubidium clock control parallel processing technologies to perform parallel control on the dual rubidium clock, and frequency modulation, phase modulation and interlocking are performed on 2 rubidium clock 1PPS output by the dual rubidium clock, so that the function of thermal backup of the dual rubidium clock is achieved, and the reliability of the system is improved.
The core time processing module is used for generating a local time by using a local clock as the core time, when each external reference source is effective, calibrating and adjusting the phase of the core time by using the reference source as a reference, and outputting decimal seconds;
the battery management module is used for monitoring the temperature and the electric quantity of the standby battery in the power supply module and controlling the charging circuit to charge the standby battery when the electric quantity is lower than a threshold value; wherein, the threshold value of electric quantity is set according to the demand by oneself.
And the communication module is used for realizing data interaction between the time-frequency control module and the power-off time-keeping module, the multi-reference-source processing module, the time-frequency generation module, the display control module and the optical fiber module.
(5) Time frequency generation module
As shown in fig. 6, the time frequency generation module includes:
the time signal generating module is used for coding the analyzed reference source 1PPS and generating various time signals of 1PPS + TOD, DCLSD and NTP;
and the frequency signal generation module is used for performing phase locking on the local clock serving as a frequency reference through a PLL and a high-stability crystal oscillator and generating frequency signals of all frequency points through a DDS frequency synthesis technology.
(6) Display control module
As shown in fig. 7, the display control module is used for connecting a display to realize real-time display of status information and corresponding operation control; namely, the man-machine interaction of the system is realized through the display control module. Wherein,
the real-time display state information comprises a reference source state, a time signal, a frequency signal, a time-frequency host and a time-frequency extension state;
the corresponding operation control comprises the equipment running mode and the switching operation of working parameters of the time-frequency host and the time-frequency extension, and the working log of the equipment is recorded. Wherein, the recorded working log at least comprises the records of equipment startup and shutdown, faults and operation.
In addition, the display control module can be configured with three display modes of day, night and dusk, so that the time-interval adaptive display effect is realized.
(7) Optical fiber module
In a time-frequency cascade loop formed by the system, a time-frequency host and a time-frequency extension set are used as nodes of the time-frequency cascade loop, and synchronous time-frequency signals are transmitted in a shared mode in an optical fiber loop. Meanwhile, the main computer nodes adopt a PTP timestamp interaction mechanism, and the influence of asymmetry can be eliminated through a PTP bidirectional processing mechanism and a time delay compensation mechanism, so that high-precision time synchronization among the main computer nodes can be realized.
(7.1) as shown in fig. 8, the optical fiber module includes a switch, and 2 uplink optical interfaces and 2 downlink optical interfaces connected to the switch; two paths of optical fiber cables are adopted between the optical fiber modules of the time-frequency host and the time-frequency extension, and a time-frequency cascade loop is in butt joint through an uplink optical interface and a downlink optical interface; the change-over switch is used for realizing the automatic switching of the uplink optical interface and the downlink optical interface by monitoring the optical interface states of the 2 uplink optical interfaces and the 2 downlink optical interfaces.
The two optical fiber cables comprise a primary optical fiber, a standby optical fiber, and 2 corresponding uplink optical interfaces and 2 corresponding downlink optical interfaces, so that a primary communication link and a standby communication link are formed in the system. When the main optical fiber or the downlink optical interface connected with the main optical fiber node fails, the selector switch automatically switches to transmit signals in the downlink direction of the standby optical fiber; when the main and standby optical fibers or the downlink optical interfaces of the main and standby optical fiber nodes are failed, the switch is switched to perform signal transmission in the uplink direction of the optical fibers. Therefore, the output of all node equipment in the system is not interrupted, and the reliability of the whole system is improved. Typically, the upstream uses 1310ns wavelength transmission and the downstream uses 1550nm wavelength transmission.
(7.2) the fiber optic module further comprises a fiber optic protocol processing module; the optical fiber protocol processing module comprises:
the scheduling data frame processing module is used for switching the uplink communication link to the local connection machine when the scheduling command sent by the time-frequency host machine received by the time-frequency machine belongs to the condition that the uplink communication link needs to be established with the time-frequency host machine, otherwise, the uplink communication link continues to forward the uplink data of the lower-level time-frequency extension machine;
the processing module of the synchronous data frame is used for realizing time synchronization between the time-frequency extension set and the time-frequency host, the initiator of the time-frequency synchronization request frame is the time-frequency extension set, and the time-frequency host replies a time synchronization response frame in real time after receiving the time-frequency extension set time synchronization request frame; after an uplink communication link between the time frequency divider and the time frequency host is established, the extension set firstly sends a time synchronization request frame and then starts to execute other communication;
and the communication data frame and link data frame processing module is used for providing a sending channel for the communication data frame and the link data frame, is internally provided with a cache space and is used for caching the frame type, the payload data length and the payload data filled by software. The communication data frame and the link data frame are both software self-defined frames.
As can be seen from the above, the present invention has the following beneficial effects:
1. the invention provides a time-frequency homologous clock by forming a time-frequency cascade loop by the time-frequency host and the time-frequency extension, realizes a uniform interface of time-frequency equipment, and uniformly monitors and manages.
2. The invention ensures the phase of the reference source output by the system through the power-off time-keeping module.
3. The invention ensures that the system output is not interrupted when a single node fails through the optical fiber module.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A distributed optical fiber time service system for ships is characterized by comprising: the system comprises a time-frequency host and a plurality of time-frequency extension sets;
the time-frequency host comprises a power module, a time-frequency control module, a power-off time keeping module, a multi-reference-source processing module, a time frequency generation module, a display control module and an optical fiber module, wherein the power-off time keeping module, the multi-reference-source processing module, the time frequency generation module, the display control module and the optical fiber module are connected with the time-frequency control module;
the time-frequency extension set comprises a power module, a time-frequency control module, a time-frequency generation module and an optical fiber module, wherein the time-frequency generation module and the optical fiber module are connected with the time-frequency control module;
the time-frequency host and the time-frequency extension sets are connected through respective optical fiber modules by adopting two paths of optical fiber cables to form a time-frequency cascade loop; the time frequency host is used for outputting time frequency signals and transmitting the time frequency signals to the time frequency extension set through the time frequency cascade loop, and the time frequency extension set recovers the time frequency signals output by the time frequency host and uses the time frequency signals as time frequency references of the time frequency extension set, so that the time frequency references of all the time frequency hosts and the time frequency extension set are homologous clocks;
the power module includes: the device comprises an AC/DC conversion module for connecting a 220V alternating current power supply, a DC/DC conversion module for connecting a 48V direct current power supply, a power supply combining module, a voltage conversion module, a standby battery and a power supply switching module; the power module supplies power to other modules in the time-frequency host and the time-frequency extension set, and supplies power to an external power supply or a standby battery of a dual rubidium clock in the power-off timekeeping module:
(1) other modules supply power: the output ends of the AC/DC conversion module and the DC/DC conversion module are connected with the voltage conversion module, and the voltage conversion module converts the voltage into the voltage required by other modules in the time-frequency host and the time-frequency extension set and then supplies power;
(2) the dual rubidium clock is powered by an external power supply: the output ends of the AC/DC conversion module and the DC/DC conversion module are connected to the power supply switching module through the power supply combining module;
(3) a dual rubidium clock supplies power by a standby battery: the standby battery is connected to the power supply switching module;
the output end of the power supply switching module is connected with the dual rubidium clock in the power-off timekeeping module, and the dual rubidium clock in the power-off timekeeping module is subjected to external power supply or standby battery power supply by controlling the power supply switching module;
the power-off timekeeping module comprises a dual rubidium clock, a phase discriminator, a CPU and a memory, and the CPU is connected to a power supply switching module of the power supply module; the phase discriminator performs real-time phase discrimination on the reference source 1PPS and the 2-way rubidium clock 1PPS output by the dual rubidium clock, and stores a phase discrimination value to a memory;
when the time-frequency host is powered off, the CPU controls the power supply switching module to switch the power supply of an external power supply of the dual rubidium clock to the power supply of the standby battery, and meanwhile, the phase of the output reference source 1PPS is maintained by means of the retention characteristic of the dual rubidium clock;
when the time-frequency host is electrified again, the CPU controls the power supply switching module to switch the power supply of the backup battery of the dual rubidium clock to the power supply of an external power supply, and meanwhile, the CPU compensates the phase of the output reference source 1PPS according to the phase discrimination values of the reference source 1PPS and the 2-way rubidium clock 1PPS which are stored in the memory before power failure.
2. The distributed optical fiber time service system for the ship of claim 1, wherein the multi-reference source processing module comprises a reference source input module, a time-frequency analysis module and a reference source selection module which are connected in sequence;
the reference source input module is used for receiving various reference sources;
the time-frequency analysis module is used for analyzing the received time information of various reference sources;
and the reference source selection module is used for selecting a reference source with the optimal signal quality from the received multiple reference sources as the current reference source by comparing the received time information of the multiple reference sources with the phase discrimination value of the local clock.
3. The distributed optical fiber time service system for the ship of claim 1, wherein the time-frequency control module comprises:
the rubidium clock control module is used for performing parallel control on the dual rubidium clocks in the dual rubidium clock power-off time keeping module and performing frequency modulation, phase modulation and interlocking on 2 paths of rubidium clock 1PPS output by the dual rubidium clocks;
the core time processing module is used for generating a local time by using a local clock as the core time, when each external reference source is effective, calibrating and adjusting the phase of the core time by using the reference source as a reference, and outputting decimal seconds;
the battery management module is used for monitoring the temperature and the electric quantity of the standby battery in the power supply module and controlling the charging circuit to charge the standby battery when the electric quantity is lower than a threshold value;
and the communication module is used for realizing data interaction between the time-frequency control module and the power-off time-keeping module, the multi-reference-source processing module, the time-frequency generation module, the display control module and the optical fiber module.
4. The distributed optical fiber time service system for the ship of claim 1, wherein the time frequency generation module comprises:
the time signal generation module is used for coding the analyzed reference source 1PPS and generating various time signals of 1PPS + TOD, DCLS and NTP;
and the frequency signal generation module is used for performing phase locking on the local clock serving as a frequency reference through a PLL and a high-stability crystal oscillator and generating frequency signals of all frequency points through a DDS frequency synthesis technology.
5. The distributed optical fiber time service system for the ship of claim 1, wherein the display control module is used for connecting a display to realize real-time display of state information and corresponding operation control;
the real-time display state information comprises a reference source state, a time signal, a frequency signal, a time-frequency host and a time-frequency extension state;
the corresponding operation control comprises the equipment running mode and the switching operation of working parameters of the time-frequency host and the time-frequency extension, and the working log of the equipment is recorded.
6. The distributed optical fiber time service system for the ship of claim 1, wherein the optical fiber module comprises a switch, and 2 uplink optical interfaces and 2 downlink optical interfaces connected with the switch; two paths of optical fiber cables are adopted between the optical fiber modules of the time-frequency host and the time-frequency extension, and a time-frequency cascade loop is in butt joint through an uplink optical interface and a downlink optical interface; the change-over switch is used for realizing the automatic switching of the uplink optical interface and the downlink optical interface by monitoring the optical interface states of the 2 uplink optical interfaces and the 2 downlink optical interfaces.
7. The distributed fiber time service system for the ship according to claim 6, wherein the fiber module further comprises a fiber protocol processing module; the optical fiber protocol processing module comprises:
the scheduling data frame processing module is used for switching the uplink communication link to the local connection machine when the scheduling command sent by the time-frequency host machine received by the time-frequency machine belongs to the condition that the uplink communication link needs to be established with the time-frequency host machine, otherwise, the uplink communication link continues to forward the uplink data of the lower-level time-frequency extension machine;
the processing module of the synchronous data frame is used for realizing time synchronization between the time-frequency extension set and the time-frequency host, the initiator of the time-frequency synchronization request frame is the time-frequency extension set, and the time-frequency host replies a time synchronization response frame in real time after receiving the time-frequency extension set time synchronization request frame; after an uplink communication link between the time frequency divider and the time frequency host is established, the extension set firstly sends a time synchronization request frame and then starts to execute other communication;
and the communication data frame and link data frame processing module is used for providing a sending channel for the communication data frame and the link data frame, is internally provided with a cache space and is used for caching the frame type, the payload data length and the payload data filled by software.
8. The distributed fiber time service system for ships according to any one of claims 1-7, wherein the time-frequency hosts comprise a main time-frequency host and a standby time-frequency host.
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| CN112379585A (en) * | 2020-11-12 | 2021-02-19 | 中国船舶重工集团公司第七0七研究所 | Time-frequency system and method with node hopping capability based on optical fiber ring architecture |
| CN112383348B (en) * | 2020-11-12 | 2022-12-09 | 中国船舶重工集团公司第七0七研究所 | Time-sharing multiplexing time-frequency transmission method based on optical fiber ring network system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993896A (en) * | 2015-05-14 | 2015-10-21 | 四川泰富地面北斗科技股份有限公司 | Time-giving system composed of dedicated optical route and method for implementing same |
| CN110336612A (en) * | 2019-06-13 | 2019-10-15 | 上海交通大学 | Local Area Fiber looped network Distributed Time frequency combines transmission system and transmission method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1598647A1 (en) * | 2004-05-19 | 2005-11-23 | Eldim Sa | Interferometer and fourier transform spectrometer |
| US7930735B2 (en) * | 2006-03-31 | 2011-04-19 | Hewlett-Packard Development Company, L.P. | Service management framework |
| CN106921457B (en) * | 2015-12-28 | 2018-09-11 | 北京东土科技股份有限公司 | The method and device that clock synchronizes is realized based on SDH network |
-
2019
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993896A (en) * | 2015-05-14 | 2015-10-21 | 四川泰富地面北斗科技股份有限公司 | Time-giving system composed of dedicated optical route and method for implementing same |
| CN110336612A (en) * | 2019-06-13 | 2019-10-15 | 上海交通大学 | Local Area Fiber looped network Distributed Time frequency combines transmission system and transmission method |
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