CN110971332A - Pulse-per-second time signal synchronization device and method - Google Patents
Pulse-per-second time signal synchronization device and method Download PDFInfo
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Abstract
The invention discloses a pulse-per-second time signal synchronization device and method, which solve the problems that the existing device and method are asymmetric in structure and inconvenient for standardized production in engineering. The device is used for realizing time synchronization between the slave station and the master station. The master station is used for receiving the external frequency standard signals and generating master station frequency standard signals, master station 1PPS electrical signals and master station 1PPS optical signals; receiving a slave station 1PPS optical signal; calculating the time interval of the master station 1PPS electrical signal and the slave station 1PPS return signal to obtain the master station time interval; the slave station has the same structure as the master station and is used for receiving the master station 1PPS optical signal and the master station time interval; generating a slave station frequency scale signal, a slave station 1PPS electrical signal and a slave station 1PPS optical signal; calculating the time interval of the slave station 1PPS electrical signal and the master station 1PPS return signal to obtain the slave station time interval; and calculating the time difference between the two stations, and adjusting the output frequency of the slave station crystal oscillator. The method is used for the device. The method has strong real-time performance and strong engineering practicability.
Description
Technical Field
The invention relates to the technical field of optical fiber time service, in particular to a pulse-per-second time signal synchronization device and method.
Background
Since the optical fiber one-way time transfer synchronization system is affected by the change of the link path, the stability of the optical fiber transfer link, i.e. the active control of the link length, needs to be maintained in real time during the time synchronization process. In contrast, the optical fiber bidirectional time transfer and synchronization system can measure and obtain high-precision clock error according to the bidirectional transmission principle even under the condition that the length of a link changes, so as to realize high-precision time synchronization. However, in most of the existing optical fiber bidirectional time synchronization systems, the slave station realizes time synchronization by actively controlling the time base of the following master station, and the slave station does not need any frequency control following module, so that the master station and the slave station have structural differences, which is not beneficial to the standardized development, production, popularization and use of equipment.
Disclosure of Invention
The invention provides a pulse-per-second time signal synchronization device and method, which solve the problems of asymmetric structure design and inconvenience in standardized production in engineering of the conventional device and method.
To achieve the above object, the present invention is realized by:
the master station is used for receiving the external frequency standard signals, generating master station frequency standard signals and master station 1PPS electrical signals, converting the master station frequency standard signals and the master station 1PPS optical signals into master station 1PPS optical signals and transmitting the master station 1PPS optical signals; receiving slave station 1PPS optical signals, outputting slave station 1PPS return signals through photoelectric conversion, and calculating time intervals of the master station 1PPS electrical signals and the slave station 1PPS return signals to obtain master station time intervals; sending the master station time interval and master station local timestamp information corresponding to the master station time interval to the slave station; the slave station has the same structure as the master station and is used for generating a slave station frequency scale signal and a slave station 1PPS (pulse per second) electric signal, converting the slave station 1PPS electric signal into a slave station 1PPS optical signal and sending the slave station 1PPS optical signal to the master station; receiving the master station 1PPS optical signal, outputting a master station 1PPS return signal through photoelectric conversion, and calculating the time intervals of the slave station 1PPS electrical signal and the master station 1PPS return signal to obtain the slave station time interval and the corresponding slave station local timestamp information; receiving the master station time interval and master station local timestamp information; calculating the time difference between the two stations to be half of the difference between the time interval of the master station and the time interval of the slave station, and adjusting the output frequency of the crystal oscillator of the slave station according to the time difference between the two stations; and the master local timestamp information corresponding to the master time interval and the slave local timestamp information corresponding to the slave time interval are delayed by a system.
Further, the master station includes: the system comprises a master station PID module, a master station crystal oscillator, a master station second pulse generation module, a master station laser emission module, a master station optical fiber circulator, a master station laser receiving module, a master station wavelength division multiplexer, a master station time interval counter and a master station time code receiving and transmitting module; the master station PID module is used for receiving the external frequency standard signal and generating a master station frequency control signal; the master station crystal oscillator is used for receiving the master station frequency control signal and generating a master station frequency scale signal; the master station second pulse generation module is used for generating the master station 1PPS electrical signal according to the master station frequency scale signal, one path of the master station second pulse is sent to the master station time interval counter, and the other path of the master station second pulse is converted into an optical signal through the master station laser emission module and outputs the master station 1PPS optical signal; the PPS optical signals of the master station 1 are transmitted to the slave station through the master station optical fiber circulator and the master station wavelength division multiplexer; the master station wavelength division multiplexer is further used for receiving the slave station 1PPS optical signals transmitted by the slave stations and transmitting the PPS optical signals to the master station laser receiving module through the master station optical fiber circulator; the master station laser receiving module is used for converting the slave station 1PPS optical signal into an electric signal and outputting the slave station 1PPS return signal; the master station time interval counter is used for receiving the master station 1PPS electrical signal and the slave station 1PPS feedback signal, calculating a time interval and obtaining the master station time interval; the master station time code transceiver module is used for receiving the master station time interval, generating the master station local timestamp information, modulating the master station time interval and the master station local timestamp information, transmitting the modulated master station time interval and the modulated master station local timestamp information to the master station wavelength division multiplexer, and transmitting the modulated master station time interval and the modulated master station local timestamp information to the slave station; the secondary station, comprising: the system comprises a slave station PID module, a slave station crystal oscillator, a slave station second pulse generation module, a slave station laser emission module, a slave station optical fiber circulator, a slave station laser receiving module, a slave station wavelength division multiplexer, a slave station time interval counter and a slave station time code receiving and sending module; the slave station crystal oscillator is used for generating a slave station frequency scale signal; the slave station second pulse generating module is used for receiving the slave station frequency scale signals to generate slave station 1PPS (pulse per second) electric signals, one path of the slave station second pulse generating module is sent to the slave station time interval counter, and the other path of the slave station second pulse generating module is converted into optical signals through the slave station laser transmitting module to output the slave station 1PPS optical signals; the PPS optical signals of the slave station 1 are transmitted to the master station through the slave station optical fiber circulator and the slave station wavelength division multiplexer; the slave station wavelength division multiplexer is further used for receiving the master station 1PPS optical signal transmitted by the master station and transmitting the PPS optical signal to the slave station laser receiving module through the slave station optical fiber circulator; the slave station laser receiving module is used for converting the master station 1PPS optical signal into an electric signal and outputting a master station 1PPS return signal; the slave station time interval counter is used for receiving the slave station 1PPS electrical signal and the master station 1PPS return signal, calculating a time interval and obtaining the slave station time interval; the slave station time code transceiving module is used for receiving the slave station time interval, generating the slave station local time stamp information and calculating the time difference between the two stations; the slave station PID module is used for receiving the time difference between the two stations and generating a slave station frequency control signal; and the slave station crystal oscillator is used for receiving the slave station frequency control signal and adjusting the output frequency of the slave station crystal oscillator.
Preferably, the master station and the slave station are switched by a switch.
Preferably, the master station second pulse generation module is further configured to automatically adjust the phase of the master station 1PPS electrical signal; and the slave station pulse per second generating module is also used for automatically adjusting the phase of the slave station 1PPS electric signal.
Preferably, the master station time code transceiver module modulates the master station time interval and the master station local timestamp information on an optical carrier by adopting a B code format, and sends the modulated information to the slave station.
Preferably, the master wavelength division multiplexer is connected with the slave wavelength division multiplexer through an optical fiber link.
The embodiment of the invention also provides a second pulse time signal synchronization method, which is used for the device and comprises the following steps: receiving an external frequency standard signal from a master station, generating a master station 1PPS electrical signal, generating and sending a master station 1PPS optical signal, receiving a slave station 1PPS optical signal and converting the slave station 1PPS optical signal into a slave station 1PPS return signal; calculating the time interval of the master station 1PPS electrical signal and the time interval of the slave station 1PPS return signal from the master station to obtain the master station time interval and the corresponding master station local timestamp information, and sending the master station local timestamp information to the slave station; generating slave station 1PPS electrical signals and slave station 1PPS optical signals by the slave station, receiving the master station 1PPS optical signals, converting the master station 1PPS optical signals into master station 1PPS return signals, and calculating the time intervals of the slave station 1PPS electrical signals and the master station 1PPS return signals to obtain the slave station time intervals and corresponding slave station local timestamp information; and calculating the time difference between the two stations to be half of the difference between the time interval of the master station and the time interval of the slave station, and adjusting the output frequency of the crystal oscillator of the slave station according to the time difference between the two stations, wherein the local timestamp information of the master station corresponding to the time interval of the master station and the local timestamp information of the slave station corresponding to the time interval of the slave station have system delay.
Further, prior to step, the method further comprises: and respectively realizing phase coarse synchronization on the master station 1PPS electrical signals and the slave station 1PPS electrical signals.
The beneficial effects of the invention include: the invention aims to provide a high-precision optical fiber bidirectional pulse per second time signal synchronizing device, which loads a pulse per second signal on a laser signal by using a digital modulation technology, and measures and obtains the time deviation between a master station and a slave station without the influence of link change when an optical pulse per second ratio is transmitted in a bidirectional way through an optical fiber link; meanwhile, the time stamp information and the one-way ratio time result of the master station equipment are transmitted to the slave stations through other optical channels by utilizing a wavelength division multiplexing technology, the slave stations synthesize the test results and the information to control the crystal oscillator frequency, and finally, the time synchronization of the master station and the slave stations is realized. The master-slave station time synchronization equipment adopts the undifferentiated function design, and the master-slave station relationship can be distinguished through the selection of the working mode, so that the equipment standardized production is easy to realize.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a diagram of an embodiment of a PPS-TSS synchronization device;
FIG. 2 is an embodiment of a PPS synchronization device including a wavelength division multiplexer;
FIG. 3 is a flow chart of an embodiment of a method for synchronizing a pulse-per-second signal;
FIG. 4 is a flowchart of an exemplary method for synchronizing the pulse-per-second signals including coarse synchronization.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In recent years, time-frequency transfer techniques based on optical fiber links have experienced rapid development. In 2017, a national foundation optical fiber time service network project is started, and aims to establish an optical fiber time service network in a national soil range and improve the national time service precision from the level of 10ns to the level of 0.1 ns. The construction of national-level high-precision time service engineering can greatly promote the development of high-precision time synchronization equipment and improve the index requirements of the time synchronization equipment.
The innovation points of the invention are as follows: the master station and the slave station adopt a non-differential design, and the working modes of the master station and the slave station are selected only by switching the switches, so that the link transmission error can be eliminated by utilizing a two-way time-frequency transmission principle, the time synchronism precision of the master station and the slave station is higher, and the standardized and modular production is more convenient in engineering.
The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an embodiment of a synchronization apparatus for pulse-per-second time signals, which is used to implement time synchronization between a slave station and a master station, and as an embodiment of the present invention, the synchronization apparatus for pulse-per-second time signals comprises: a master station 1 and a slave station 2.
The master station is used for receiving the external frequency standard signals, generating master station frequency standard signals and master station 1PPS electrical signals, converting the master station frequency standard signals and the master station 1PPS optical signals into master station 1PPS optical signals and transmitting the master station 1PPS optical signals; receiving slave station 1PPS optical signals, outputting slave station 1PPS return signals through photoelectric conversion, and calculating time intervals of the master station 1PPS electrical signals and the slave station 1PPS return signals to obtain master station time intervals; and sending the master station time interval and the master station local timestamp information corresponding to the master station time interval to the slave station.
The slave station has the same structure as the master station and is used for generating a slave station frequency scale signal and a slave station 1PPS (pulse per second) electric signal, converting the slave station 1PPS electric signal into a slave station 1PPS optical signal and sending the slave station 1PPS optical signal to the master station; receiving the master station 1PPS optical signal, outputting a master station 1PPS return signal through photoelectric conversion, and calculating the time intervals of the slave station 1PPS electrical signal and the master station 1PPS return signal to obtain the slave station time interval and the corresponding slave station local timestamp information; receiving the master station time interval and master station local timestamp information; calculating the time difference between the two stations to be half of the difference between the time interval of the master station and the time interval of the slave station, and adjusting the output frequency of the crystal oscillator of the slave station according to the time difference between the two stations; and the master local timestamp information corresponding to the master time interval and the slave local timestamp information corresponding to the slave time interval are delayed by a system.
In the embodiment of the invention, the master station and the slave station adopt a non-differential design, master and slave station time synchronization equipment in the non-differential design is distinguished by selecting an internal working mode, the master station equipment takes an input external frequency mark as a time base reference in the 'master station working mode', and the slave station equipment controls a crystal oscillator in the equipment according to an internal feedback signal in the 'slave station working mode', so that the time base synchronization of the master station and the slave station is realized.
In the present invention, it should be noted that the master local timestamp information corresponding to the master time interval and the slave local timestamp information corresponding to the slave time interval have a system delay, and the system delay is a numerical value that fluctuates around a certain fixed value.
In the embodiment of the present invention, it is considered that the time for the master station to generate the master station 1PPS optical signal is the same as the time for the master station to obtain the master station time interval, so that the master station 1PPS optical signal corresponds to the master station time interval and master station local timestamp information; similarly, the slave station 1PPS optical signal corresponds to the slave station time interval and slave station local time stamp information.
It should be noted that the master local timestamp information and the slave local timestamp information are used to obtain the slave time interval at the time corresponding to the master time interval, because there is a system delay between the master local timestamp information and the slave local timestamp information.
The master station and the slave station are switched by a switch.
The PPS is a abbreviation of pulse per second.
The embodiment of the invention provides a high-precision optical fiber bidirectional pulse per second time signal synchronization device, which is used for measuring and obtaining the time deviation between a master station and a slave station without the influence of link change when the optical pulse per second ratio is transmitted in a bidirectional mode through an optical fiber link, and has high measurement precision and strong practicability.
Fig. 2 is a diagram illustrating an embodiment of a synchronization apparatus for a epochs signal including a wavelength division multiplexer, which discusses the structures of the master station and the slave station, and as an embodiment of the present invention, the synchronization apparatus for an epochs signal includes: a master station 1 and a slave station 2.
The master station comprises: the system comprises a main station PID module 3, a main station crystal oscillator 4, a main station second pulse generation module 5, a main station laser emission module 6, a main station optical fiber circulator 7, a main station laser receiving module 8, a main station wavelength division multiplexer 9, a main station time interval counter 10 and a main station time code transceiver module 11.
The secondary station, comprising: the system comprises a slave station PID module 12, a slave station crystal oscillator 13, a slave station second pulse generation module 14, a slave station laser emission module 15, a slave station optical fiber circulator 16, a slave station laser receiving module 17, a slave station wavelength division multiplexer 18, a slave station time interval counter 19 and a slave station time code transceiving module 20.
The master station PID module is used for receiving the external frequency standard signal and generating a master station frequency control signal; the master station crystal oscillator is used for receiving the master station frequency control signal and generating a master station frequency scale signal; the master station second pulse generation module is used for generating the master station 1PPS electrical signal according to the master station frequency scale signal, one path of the master station second pulse is sent to the master station time interval counter, and the other path of the master station second pulse is converted into an optical signal through the master station laser emission module and outputs the master station 1PPS optical signal; the PPS optical signals of the master station 1 are transmitted to the slave station through the master station optical fiber circulator and the master station wavelength division multiplexer; the master station wavelength division multiplexer is further used for receiving the slave station 1PPS optical signals transmitted by the slave stations and transmitting the PPS optical signals to the master station laser receiving module through the master station optical fiber circulator; the master station laser receiving module is used for converting the slave station 1PPS optical signal into an electric signal and outputting the slave station 1PPS return signal; the master station time interval counter is used for receiving the master station 1PPS electrical signal and the slave station 1PPS feedback signal, calculating a time interval and obtaining the master station time interval; and the master station time code transceiver module is used for receiving the master station time interval, generating the master station local timestamp information, modulating the master station time interval and the master station local timestamp information, transmitting the modulated master station time interval and the modulated master station local timestamp information to the master station wavelength division multiplexer, and transmitting the modulated master station time interval and the modulated master station local timestamp information to the slave station.
The slave station crystal oscillator is used for generating a slave station frequency scale signal; the slave station second pulse generating module is used for generating the slave station 1PPS electric signals according to the slave station frequency scale signals, one path of the slave station second pulse generating module is sent to the slave station time interval counter, and the other path of the slave station second pulse generating module is converted into optical signals through the slave station laser emitting module to output the slave station 1PPS optical signals; the PPS optical signals of the slave station 1 are transmitted to the master station through the slave station optical fiber circulator and the slave station wavelength division multiplexer; the slave station wavelength division multiplexer is further used for receiving the master station 1PPS optical signal transmitted by the master station and transmitting the PPS optical signal to the slave station laser receiving module through the slave station optical fiber circulator; the slave station laser receiving module is used for converting the master station 1PPS optical signal into an electric signal and outputting a master station 1PPS return signal; the slave station time interval counter is used for receiving the slave station 1PPS electrical signal and the master station 1PPS return signal, calculating a time interval and obtaining the slave station time interval; the slave station time code transceiving module is used for receiving the slave station time interval, generating the slave station local time stamp information and calculating the time difference between the two stations; the slave station PID module is used for receiving the time difference between the two stations and generating a slave station frequency control signal; and the slave station crystal oscillator is used for receiving the slave station frequency control signal and adjusting the output frequency of the slave station crystal oscillator.
In the embodiment of the present invention, the master station time code transceiver module modulates the master station time interval on an optical carrier by using a B code format, and transmits the modulated optical carrier to the slave station.
Further, the master station second pulse generation module is also used for automatically adjusting the phase of the master station 1PPS electrical signal; and the slave station pulse per second generating module is also used for automatically adjusting the phase of the slave station 1PPS electric signal.
It should be noted that the master station locks an external frequency standard signal input from the outside through an internal crystal oscillator, so as to synchronize the master station frequency standard signal with the external frequency standard signal; and the slave station realizes the time synchronization of the slave station and the master station through the time difference of the two stations, and the closer the time difference of the two stations is to 0, the higher the synchronization precision of the slave station and the master station is.
It should be noted that the master wavelength division multiplexer is connected to the slave wavelength division multiplexer through an optical fiber link.
The time base synchronization principle of the master station and the slave station is as follows: firstly, the master station device inputs an external frequency mark as a time base reference to control the frequency of an internal crystal oscillator, then generates a master station 1PPS electrical signal, the 1PPS signal is divided into two paths, one path is used for modulating the intensity of emitted laser to generate a 1PPS optical signal, and the other path is used as an input signal of a Time Interval Counter (TIC) in the device to measure the time interval delta T between the input signal and a 1PPS optical signal receiving end signalmaster. The optical transmitting and receiving are connected with a wavelength division multiplexer in the equipment through an optical fiber circulator, and the wavelength division multiplexer is connected with an optical fiber link between the master and slave station equipment. The other input end of the wavelength division multiplexer is an optical time code receiving and transmitting moduleAnd the block modulates the time stamp information of the local end and the time interval result measured by the local end on an optical carrier by adopting a B code format and transmits the time stamp information and the time interval result to the opposite side station through other optical channels.
Due to the adoption of the undifferentiated design, the working principle of the slave station equipment is similar to that of the master station. The difference is that the slave station Time Interval Counter (TIC) obtains the local end time interval Δ T on the measurementslaveThen, the result is sent to an optical time code transceiver module, then, the optical time code transceiver module sends the local timestamp information, the time interval measurement information and the time interval measurement result transmitted by the main station to a feedback control unit, and the time difference between the two stations is obtained by processing according to a two-way time frequency transmission principle
And according to the time difference between the two stations, the internal crystal oscillator is fed back and controlled, so that the time synchronization of the master station and the slave station is ensured.
The embodiment of the invention provides a pulse-per-second time signal synchronizing device, which transmits time stamp information and a one-way ratio time result of master station equipment to slave stations through other optical channels by using a wavelength division multiplexing technology, and the slave stations integrate the test results and information to control crystal oscillator frequency, thereby finally realizing time synchronization of the master station and the slave stations. The time signal synchronization device in the embodiment of the invention has the advantages of simple equipment, symmetrical structural design, easy realization of standardization in engineering and high synchronization precision.
Fig. 3 is a flow chart of a method for synchronizing a pulse-per-second time signal, which can be used in the 1 st or 2 nd embodiment of the present invention, and specifically includes the following steps:
and 101, receiving an external frequency standard signal from a master station, generating a master station frequency standard signal and a master station 1PPS electrical signal, generating and sending a master station 1PPS optical signal, and receiving and converting a slave station 1PPS optical signal into a slave station 1PPS return signal.
In step 101, the master station crystal oscillator maintains synchronization with the external frequency standard signal under the control of the master station PID module.
And 102, calculating the time interval of the master station 1PPS electrical signal and the time interval of the slave station 1PPS return signal from the master station to obtain the master station time interval and corresponding master station local timestamp information, and sending the master station local timestamp information to the slave station.
In step 102, the master TIC is configured to receive the master 1PPS electrical signals and the slave 1PPS electrical signals, and calculate the master time interval.
In step 102, the master station transmits the master time interval to the slave station via a master wavelength division multiplexer.
And 103, generating slave station 1PPS electrical signals and slave station 1PPS optical signals by the slave station, receiving the master station 1PPS optical signals, converting the slave station 1PPS optical signals into master station 1PPS return signals, and calculating the time intervals of the slave station 1PPS electrical signals and the master station 1PPS return signals to obtain the slave station time intervals and the corresponding slave station local timestamp information.
And 104, calculating the time difference between the two stations to be half of the difference between the time interval of the master station and the time interval of the slave station, and adjusting the output frequency of the crystal oscillator of the slave station according to the time difference between the two stations.
In step 104, the master local timestamp information corresponding to the master time interval and the slave local timestamp information corresponding to the slave time interval have a system delay.
Fig. 4 is a flow chart of an embodiment of a method for synchronizing a pulse-per-second time signal including coarse synchronization, including the steps of:
and step 201, respectively realizing phase coarse synchronization on the master station 1PPS electrical signal and the slave station 1PPS electrical signal.
In step 201, before the high-precision time synchronization is realized, the time intervals of the 1PPS signals respectively generated by the internal crystal oscillators of the master and slave station devices are usually greater than the period of the internal sampling clock, so that the time coarse synchronization needs to be completed first, and this step is also an automatic processing process of the pulse-per-second generation module in the device. And (3) completing one-time slave station 1PPS phase adjustment by adopting a mode of injecting a control word into a pulse per second generating module in the slave station equipment, so that the time interval between a local pulse and a master station transmitted pulse is smaller than a sampling clock period, and then executing high-precision time synchronization.
And 202, receiving the external frequency standard signal from the master station, generating a master station 1PPS electrical signal, generating and sending a master station 1PPS optical signal, receiving a slave station 1PPS optical signal and converting the slave station 1PPS optical signal into a slave station 1PPS return signal.
And 203, calculating the time interval of the master station 1PPS electrical signal and the time interval of the slave station 1PPS return signal from the master station to obtain the master station time interval and the corresponding master station local timestamp information, and sending the master station local timestamp information to the slave station.
And 204, generating slave station 1PPS electrical signals and slave station 1PPS optical signals by the slave station, receiving the master station 1PPS optical signals, converting the slave station 1PPS optical signals into master station 1PPS return signals, and calculating the time intervals of the slave station 1PPS electrical signals and the master station 1PPS return signals to obtain the slave station time intervals and the corresponding slave station local timestamp information.
And step 205, calculating the time difference between the two stations to be half of the difference between the time interval between the master station and the time interval between the slave stations, and adjusting the output frequency of the crystal oscillator of the slave station according to the time difference between the two stations.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (8)
1. A pulse-per-second time signal synchronizing device for realizing time synchronization between a slave station and a master station,
the master station is used for transmitting the data to the mobile terminal,
receiving an external frequency standard signal, generating a master station frequency standard signal and a master station 1PPS electrical signal, converting the master station frequency standard signal and the master station 1PPS optical signal into master station 1PPS optical signals, and transmitting the master station 1PPS optical signals;
receiving slave station 1PPS optical signals, outputting slave station 1PPS return signals through photoelectric conversion, and calculating time intervals of the master station 1PPS electrical signals and the slave station 1PPS return signals to obtain master station time intervals;
sending the master station time interval and master station local timestamp information corresponding to the master station time interval to the slave station;
the slave station has the same structure as the master station and is used for,
generating a slave station frequency scale signal and the slave station 1PPS electrical signal, converting the slave station frequency scale signal into a slave station 1PPS optical signal and sending the slave station 1PPS optical signal to the master station;
receiving the master station 1PPS optical signal, outputting a master station 1PPS return signal through photoelectric conversion, and calculating the time intervals of the slave station 1PPS electrical signal and the master station 1PPS return signal to obtain the slave station time interval and the corresponding slave station local timestamp information;
receiving the master station time interval and master station local timestamp information;
calculating the time difference between the two stations to be half of the difference between the time interval of the master station and the time interval of the slave station, and adjusting the output frequency of the crystal oscillator of the slave station according to the time difference between the two stations;
and the master local timestamp information corresponding to the master time interval and the slave local timestamp information corresponding to the slave time interval are delayed by a system.
2. The chronograph signal synchronizing device of claim 1,
the master station comprises: the system comprises a master station PID module, a master station crystal oscillator, a master station second pulse generation module, a master station laser emission module, a master station optical fiber circulator, a master station laser receiving module, a master station wavelength division multiplexer, a master station time interval counter and a master station time code receiving and transmitting module;
the master station PID module is used for receiving the external frequency standard signal and generating a master station frequency control signal;
the master station crystal oscillator is used for receiving the master station frequency control signal and generating a master station frequency scale signal;
the master station second pulse generation module is used for generating master station 1PPS electrical signals according to the master station frequency scale signals, one path of the master station second pulse generation module is sent to the master station time interval counter, and the other path of the master station second pulse generation module is converted into optical signals through the master station laser emission module and outputs the master station 1PPS optical signals;
the PPS optical signals of the master station 1 are transmitted to the slave station through the master station optical fiber circulator and the master station wavelength division multiplexer;
the master station wavelength division multiplexer is further used for receiving the slave station 1PPS optical signals transmitted by the slave stations and transmitting the PPS optical signals to the master station laser receiving module through the master station optical fiber circulator;
the master station laser receiving module is used for converting the slave station 1PPS optical signal into an electric signal and outputting the slave station 1PPS return signal;
the master station time interval counter is used for receiving the master station 1PPS electrical signal and the slave station 1PPS feedback signal, calculating a time interval and obtaining the master station time interval;
the master station time code transceiver module is used for receiving the master station time interval, generating the master station local timestamp information, modulating the master station time interval and the master station local timestamp information, transmitting the modulated master station local timestamp information to the master station wavelength division multiplexer, and transmitting the modulated master station local timestamp information to the slave station;
the secondary station, comprising: the system comprises a slave station PID module, a slave station crystal oscillator, a slave station second pulse generation module, a slave station laser emission module, a slave station optical fiber circulator, a slave station laser receiving module, a slave station wavelength division multiplexer, a slave station time interval counter and a slave station time code receiving and sending module;
the slave station crystal oscillator is used for generating a slave station frequency scale signal;
the slave station second pulse generating module is used for generating a slave station 1PPS (pulse per second) electric signal according to the slave station frequency scale signal, one path of the slave station second pulse generating module is sent to the slave station time interval counter, and the other path of the slave station second pulse generating module is converted into an optical signal through the slave station laser transmitting module to output the slave station 1PPS optical signal;
the PPS optical signals of the slave station 1 are transmitted to the master station through the slave station optical fiber circulator and the slave station wavelength division multiplexer;
the slave station wavelength division multiplexer is further used for receiving the master station 1PPS optical signal transmitted by the master station and transmitting the PPS optical signal to the slave station laser receiving module through the slave station optical fiber circulator;
the slave station laser receiving module is used for converting the master station 1PPS optical signal into an electric signal and outputting a master station 1PPS return signal;
the slave station time interval counter is used for receiving the slave station 1PPS electrical signal and the master station 1PPS return signal, calculating a time interval and obtaining the slave station time interval;
the slave station time code transceiving module is used for receiving the slave station time interval, generating the slave station local time stamp information and calculating the time difference between the two stations;
the slave station PID module is used for receiving the time difference between the two stations and generating a slave station frequency control signal;
and the slave station crystal oscillator is used for receiving the slave station frequency control signal and adjusting the output frequency of the slave station 1PPS crystal oscillator.
3. The PPS time signal synchronizer according to any one of claims 1 through 2, wherein the master station and the slave station are switched by a switch.
4. The chronograph signal synchronizing device according to claim 2,
the master station second pulse generation module is also used for automatically adjusting the phase of the master station 1PPS electrical signal;
and the slave station pulse per second generating module is also used for automatically adjusting the phase of the slave station 1PPS electric signal.
5. The chronograph signal synchronizing device according to claim 2,
and the master station time code transceiver module modulates the master station time interval and the master station local timestamp information on an optical carrier by adopting a B code format and sends the information to the slave station.
6. The pulse-per-second time signal synchronizing device according to claim 2, wherein the master wavelength division multiplexer and the slave wavelength division multiplexer are connected by an optical fiber link.
7. A pulse-per-second time signal synchronization method for the device of any one of claims 1 to 6, comprising the steps of:
receiving an external frequency standard signal from a master station, generating a master station frequency standard signal and a master station 1PPS electrical signal, generating and sending a master station 1PPS optical signal, receiving a slave station 1PPS optical signal and converting the slave station 1PPS optical signal into a slave station 1PPS return signal;
calculating the time interval of the master station 1PPS electrical signal and the time interval of the slave station 1PPS return signal from the master station to obtain the master station time interval and the corresponding master station local timestamp information, and sending the master station local timestamp information to the slave station;
generating a slave station frequency scale signal, a slave station 1PPS electrical signal, a slave station 1PPS optical signal, receiving the master station 1PPS optical signal, converting the master station 1PPS optical signal into a master station 1PPS return signal, and calculating the time intervals of the slave station 1PPS electrical signal and the master station 1PPS return signal to obtain the slave station time interval and corresponding slave station local timestamp information;
and calculating the time difference between the two stations to be half of the difference between the time interval of the master station and the time interval of the slave station, and adjusting the output frequency of the crystal oscillator of the slave station according to the time difference between the two stations, wherein the local timestamp information of the master station corresponding to the time interval of the master station and the local timestamp information of the slave station corresponding to the time interval of the slave station have system delay.
8. The pulse-per-second time signal synchronization method of claim 7, wherein before step, the method further comprises:
and respectively realizing phase coarse synchronization on the master station 1PPS electrical signals and the slave station 1PPS electrical signals.
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