CN211628026U - Remote time service system of observation instrument - Google Patents
Remote time service system of observation instrument Download PDFInfo
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- CN211628026U CN211628026U CN202020493935.9U CN202020493935U CN211628026U CN 211628026 U CN211628026 U CN 211628026U CN 202020493935 U CN202020493935 U CN 202020493935U CN 211628026 U CN211628026 U CN 211628026U
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Abstract
One or more embodiments of the present disclosure provide a remote time service system for a scope, including: the time service information receiving and processing device is used for receiving the time service information of the time service source, carrying out electro-optical conversion on the time service information and obtaining optical time service information; the time service information at least comprises a time service signal and a pulse per second signal, and the optical time service information at least comprises an optical time service signal and an optical pulse per second signal; and the time service information processing and forwarding device is used for receiving the light time service information and forwarding the light time service information to at least one observation instrument. The remote time service system can provide synchronous time service for at least one observation instrument far away from a time service source.
Description
Technical Field
One or more embodiments of the present disclosure relate to the technical field of observation instruments, and in particular, to a remote time service system for an observation instrument.
Background
At present, some observation instruments need a time service source to provide a time service signal, and an antenna of the time service source or the time service source generally needs to be installed in a place where satellite signals can be received on the outdoor ground. Some observation instruments are special in installation position, often too far away from a time service source, and have difficulty in receiving time service information.
In the technical field of earthquake observation, some earthquake observation instruments need to be installed in special environments, for example, the earthquake observation instrument used for monitoring the vibration state in a mine is installed in a mine roadway and is generally dozens of kilometers away from a ground working area; the earthquake observation instruments are used for monitoring the vibration state in the tunnel and are arranged at different depths of the tunnel, and the distance from the tunnel opening is from dozens of meters to kilometers; the earthquake observation instruments used for monitoring the vibration state of the bottom of the dam are arranged at the bottom of the dam and are about hundreds of meters away from the top of the dam, … … and the like, and the installation positions of the earthquake observation instruments are far away from the ground and are difficult to receive time service signals of time service sources.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of one or more embodiments of the present disclosure is to provide a time service system for a surveying instrument, which can provide a time service signal for a surveying instrument installed at a distance from the ground.
In view of the above, one or more embodiments of the present disclosure provide a remote time service system for a scope, including:
the time service information receiving and processing device is used for receiving the time service information of a time service source, and performing electro-optical conversion on the time service information to obtain optical time service information; the time service information at least comprises a time service signal and a pulse per second signal, and the optical time service information at least comprises an optical time service signal and an optical pulse per second signal;
and the time service information processing and forwarding device is used for receiving the optical time service information and forwarding the optical time service information to at least one observation instrument.
Optionally, the time service information receiving and processing device includes:
the serial interface unit is used for receiving the time service signal and transmitting the time service signal to the first photoelectric conversion unit;
and the first photoelectric conversion unit is used for performing electro-optical conversion on the time service signal to obtain the optical time service signal, and transmitting the optical time service signal to the time service information processing and forwarding device.
Optionally, the time service information receiving and processing device further includes:
the first processing unit is used for receiving the pulse per second signal, modulating the pulse per second signal to obtain a modulated pulse per second signal, and transmitting the modulated pulse per second signal to the first photoelectric conversion unit;
and the first photoelectric conversion unit is used for performing electro-optical conversion on the modulated pulse per second signal to obtain the optical pulse per second signal, and transmitting the optical pulse per second signal to the time service information processing and forwarding device.
Optionally, the time service information receiving and processing device further includes:
the driving unit is used for amplifying the modulated pulse-per-second signal and transmitting the amplified pulse-per-second signal to the first photoelectric conversion unit;
the first photoelectric conversion unit is used for performing electro-optical conversion on the amplified pulse-per-second signal to obtain an amplified optical pulse-per-second signal, and transmitting the amplified optical pulse-per-second signal to the time service information processing and forwarding device.
Optionally, the first processing unit includes:
and the modulation circuit is used for modulating the pulse per second signal to obtain a modulated pulse per second signal, the modulated pulse per second signal is a pulse per second square wave signal with a preset frequency, and the square wave corresponding to the whole second time in the pulse per second signal has a preset duty ratio.
Optionally, the time service information processing and forwarding device includes:
the second photoelectric conversion unit is used for receiving the optical time service information, performing photoelectric conversion on the optical time service information, performing electro-optical conversion on the optical time service information to obtain converted optical time service information, and transmitting the converted optical time service information to the optical signal forwarding unit;
and the optical signal forwarding unit is used for forwarding the converted optical time service information to at least one observation instrument.
Optionally, the time service information processing and forwarding device further includes:
an optical signal shaping unit, configured to shape the converted optical time service information to obtain shaped optical time service information, and transmit the shaped optical time service information to the optical signal forwarding unit;
and the optical signal forwarding unit is used for forwarding the shaped optical time service information to at least one observation instrument.
Optionally, the time service information processing and forwarding unit includes:
the second photoelectric conversion unit is used for receiving the optical time service information and performing photoelectric conversion on the optical time service information to obtain the time service information;
and the electric signal forwarding unit is used for forwarding the time service information to at least one observation instrument.
Optionally, the time service information processing and forwarding unit further includes:
the second processing unit is used for demodulating the pulse per second signal to obtain a demodulated pulse per second signal;
and the electric signal forwarding unit is used for forwarding the time service signal and the demodulated pulse-per-second signal to at least one observation instrument.
Optionally, the time service information processing and forwarding unit further includes:
the electric signal shaping unit is used for shaping the time service information to obtain shaped time service information; the shaped time service information comprises a shaped time service signal and a pulse per second signal;
the second processing unit is used for demodulating the shaped pulse-per-second signal to obtain a demodulated pulse-per-second signal;
and the electric signal forwarding unit is used for forwarding the shaped time service signal and the demodulated pulse per second signal to at least one observation instrument.
From the above, it can be seen that the remote timing system of the observation instrument provided by one or more embodiments of the present specification includes: the time service information receiving and processing device is used for receiving the time service information of the time service source, carrying out electro-optical conversion on the time service information and obtaining optical time service information; the time service information at least comprises a time service signal and a pulse per second signal, and the optical time service information at least comprises an optical time service signal and an optical pulse per second signal; and the time service information processing and forwarding device is used for receiving the light time service information and forwarding the light time service information to at least one observation instrument. The remote time service system can provide synchronous time service for at least one observation instrument far away from a time service source.
Drawings
In order to more clearly illustrate one or more embodiments or prior art solutions of the present specification, the drawings that are needed in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only one or more embodiments of the present specification, and that other drawings may be obtained by those skilled in the art without inventive effort from these drawings.
FIG. 1 is a block diagram of a remote time service system according to one or more embodiments of the present disclosure;
fig. 2 is a block diagram illustrating a time service information receiving and processing device according to one or more embodiments of the present disclosure;
fig. 3 is a block diagram illustrating a structure of a time service information processing and forwarding device according to one or more embodiments of the present disclosure;
FIG. 4 is a waveform diagram of a pulse-per-second square wave signal according to one or more embodiments of the present disclosure;
FIG. 5 is a block diagram of a modulation circuit according to one or more embodiments of the present disclosure;
FIG. 6 is a block diagram of a system deployment architecture for one or more embodiments of the present description.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
It is to be noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present specification should have the ordinary meaning as understood by those of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in one or more embodiments of the specification is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
As shown in fig. 1, one or more embodiments of the present disclosure provide a remote timing system for a scope, including:
a time service information receiving and processing device 10 for receiving the time service information from the time service source 30, and performing electro-optical conversion on the time service information to obtain optical time service information; the optical time service information at least comprises an optical time service signal and an optical pulse-per-second signal;
and a time service information processing and forwarding device 20, configured to receive the optical time service information and forward the optical time service information to at least one observation instrument 40.
In this embodiment, the remote time service system of the observation instrument includes a time service information receiving and processing device 10 and a time service information processing and forwarding device 20, wherein the time service information receiving and processing device 10 is configured to receive time service information from a time service source 30, convert the time service information into optical time service information, transmit the optical time service information to the time service information processing and forwarding device 20, and forward the optical time service information to at least one observation instrument 40 by the time service information processing and forwarding device 20. The time service system of the embodiment can realize the long-distance transmission of the time service information of the time service source, thereby providing the time service information for the observation instrument which is far away from the ground.
In some embodiments, the time service information receiving and processing device 10 is disposed near the time service source 30 or the antenna of the time service source 30, the signal output terminal of the time service source 30 is connected to the signal input terminal of the time service information receiving and processing device 10, and the time service information receiving and processing device 10 can receive the time service information of the time service source 30. The time service information output by the time service source 30 at least includes information such as a time service signal, a pulse per second signal, a position signal and the like; correspondingly, the optical time service information after the electro-optical conversion at least comprises information such as an optical time service signal, an optical pulse per second signal, an optical position signal and the like. Optionally, the time service source 30 may be a GPS time service module, a big dipper time service module, or another module having a time service function.
The time information receiving and processing device 10 and the time information processing and transmitting device 20 are connected by an optical fiber. The time information receiving and processing device 10 converts the received time information into optical time information in an optical format, and transmits the optical time information to the time information processing and transmitting device 20 via an optical fiber.
The time service information processing and forwarding device 20 is disposed at a position close to the observation instrument 40, and an output end of the time service information processing and forwarding device 20 is connected to at least one observation instrument 40 to forward the optical time service information to at least one observation instrument 40, so as to provide time service information for the observation instrument 40. Since the transmission distance of the optical fiber is long, the time information of the time service source 30 can be obtained by the time service system even if the observation instrument 40 is installed at a special position far from the ground.
As shown in fig. 2, in one or more embodiments of the present disclosure, a time service information receiving and processing device 10 includes:
the serial interface unit 12 is configured to receive a time signal and transmit the time signal to the first photoelectric conversion unit 11;
the first photoelectric conversion unit 11 is configured to perform an electro-optical conversion on the time signal to obtain an optical time signal, and transmit the optical time signal to the time information processing and forwarding device 20.
In this embodiment, the time service information at least includes a time service signal and a pulse per second signal. The receiving process of the time service signal is that a time service signal output end of the time service source 30 is connected with a signal input end of the serial interface unit 12, and a signal output end of the serial interface unit 12 is connected with an electrical signal input end of the first photoelectric conversion unit 11; the time signal output from the time source 30 is transmitted to the serial interface unit 12, the serial interface unit 12 transmits the time signal to the first photoelectric conversion unit 11, the first photoelectric conversion unit 11 performs electro-optical conversion on the received electric time signal to obtain an optical time signal, and then the optical time signal is transmitted to the time information processing and forwarding device 20 through an optical fiber.
In some embodiments, the time signal output end of the time source 30 is an asynchronous serial port, the serial interface unit 12 is an RS485 serial port, the asynchronous serial time signal output by the asynchronous serial port of the time source 30 is converted into a differential time signal by using the RS485 serial port, and the differential time signal is transmitted to the first photoelectric conversion unit 11 for electro-optical conversion, so as to obtain an optical time signal in an optical form, thereby achieving long-distance and high-speed transmission of the time signal.
In some embodiments, the time service information receiving and processing device 10 further includes:
the first processing unit 13 is configured to receive the pulse per second signal, modulate the pulse per second signal to obtain a modulated pulse per second signal, and transmit the modulated pulse per second signal to the first photoelectric conversion unit 11;
the first photoelectric conversion unit 11 is configured to perform electro-optical conversion on the modulated pulse-per-second signal to obtain an optical pulse-per-second signal, and transmit the optical pulse-per-second signal to the time service information processing and forwarding device 20.
In this embodiment, the receiving process of the pulse per second signal is that the pulse per second signal output end of the time service source 30 is connected to the signal input end of the first processing unit 13, and the signal output end of the first processing unit 13 is connected to the electrical signal input end of the first photoelectric conversion unit 11; the first processing unit 13 receives the second pulse signal of the time service source 30, modulates the second pulse signal to obtain a modulated second pulse signal, transmits the modulated second pulse signal to the first photoelectric conversion unit 11, and the first photoelectric conversion unit 11 performs electro-optical conversion on the modulated second pulse signal to obtain an optical second pulse signal in an optical form, and then transmits the optical second pulse signal to the time service information processing and forwarding device 20. In this embodiment, after the pulse per second signal is received, the pulse per second signal and the time service signal may be used to realize synchronous time service subsequently.
In some embodiments, the first processing unit 13 comprises:
the modulation circuit is used for modulating the pulse per second signal to obtain a modulated pulse per second signal; in some embodiments, the modulated pulse-per-second signal is a pulse-per-second square wave signal having a predetermined frequency, and the square wave of the pulse-per-second square wave signal corresponding to the second-integer time has a predetermined duty ratio.
In some embodiments, the modulation circuit is a circuit capable of generating a predetermined square wave signal, and the second pulse square wave signal is generated by the circuit to have a predetermined frequency based on the second pulse signal, and the square wave corresponding to the second time in the second pulse signal has a predetermined duty ratio. For example, as shown in fig. 4, a modulation circuit is used to generate a pulse-per-second square wave signal with a frequency of 1KHz, in the pulse-per-second square wave signal, the duty ratio of the square wave corresponding to the second time in the pulse-per-second signal is a first duty ratio, and the duty ratio of the square wave corresponding to the second time is a second duty ratio, the first duty ratio is different from the second duty ratio, optionally, the first duty ratio may be set to 80%, and the second duty ratio is set to 50%. In this embodiment, the pulse-per-second signal is modulated, subjected to the electro-optical conversion, and transmitted through the optical fiber, so that the frequency band limitation of the photoelectric conversion unit and the frequency characteristic influence of the optical fiber transmission signal can be reduced, and the signal transmission reliability can be improved.
As shown in fig. 5, in some implementations, the modulation circuit includes a crystal oscillator, a counter, a timer, and a PWM signal generator, a signal output end of the crystal oscillator is connected to a signal input end of the counter, a pulse-per-second signal end of the time service source is connected to a signal input end of the counter, the counter freely counts according to an output signal of the crystal oscillator, when the pulse-per-second signal is received, the counting is interrupted to obtain a count value, and a frequency of the crystal oscillator is calculated according to the count value. If the frequency of the crystal oscillator is f and the count difference between two consecutive Pulse Per Second (PPS) signals is N, the accurate frequency fm of the crystal oscillator can be measured as:
if the counting difference N is less than or equal to half of the frequency f, then fm is f + N;
if the count difference N is greater than half the frequency f, fm equals N.
The signal output end of the counter is connected with the signal input end of the timer, and the accurate frequency fm of the crystal oscillator measured by the counter is transmitted to the timer and is used as a timer parameter for generating a pulse-per-second square wave signal; the timer calculates the first clock number of the square wave with the first duty ratio K1 and the second clock number of the square wave with the second duty ratio according to the timer parameter;
the number of the first clocks is as follows: (K1 × fm)/f 1;
the second clock number is: (K2 × fm)/f1
Where f1 is the frequency of the generated pulse-per-second square wave signal. If a 1KHz pulse-per-second square wave signal is generated, the first duty ratio of the square wave at the time of whole second is 80%, and the second duty ratio of the square wave at the time of non-whole second is 50%, then:
the number of the first clocks is as follows: (0.8 × fm)/1000;
the second clock number is: (0.5 x fm)/1000
The output signal end of the timer is connected with the signal input end of the PWM signal generator, the first clock number and the second clock number obtained by calculation of the timer are transmitted to the PWM signal generator, and the PWM signal generator generates pulse-per-second square wave signals with preset frequency according to the first clock number and the second clock number. Optionally, in order to obtain a high-precision pulse-per-second square wave signal, a high-frequency crystal oscillator may be used, for example, a frequency oscillator with a frequency of 20MHz is selected, and the resolution may reach 50 ns.
In some implementation manners, the first processing unit 13 may be implemented based on a single chip, and a counter, a timer, and a PWM signal generator in the modulation circuit may all be implemented by using corresponding functional circuits in the single chip.
In some embodiments, the time service information receiving and processing device 10 further includes:
a driving unit 14, configured to amplify the modulated pulse-per-second signal, and transmit the amplified pulse-per-second signal to the first photoelectric conversion unit 11;
and the first photoelectric conversion unit 11 is configured to perform electro-optical conversion on the amplified pulse-per-second signal to obtain an amplified optical pulse-per-second signal, and transmit the amplified optical pulse-per-second signal to the time service information processing and forwarding device.
In this embodiment, the signal output terminal of the first processing unit 13 is connected to the first photoelectric conversion unit 11 through the driving unit 14. The modulated pulse per second signal obtained by the processing of the first processing unit 13 is amplified by the driving unit 14, subjected to electro-optical conversion by the first photoelectric conversion unit 11, and transmitted through an optical fiber.
The above one or more embodiments explain the structure and function of the time service information receiving and processing device 10 of the present specification, and the time service information receiving and processing device 10 can receive time service information from a time service source, transmit optical time service information to the time service information processing and transmitting device 20 after electro-optical conversion, receive the optical time service information by the time service information transmitting device 20, and further transmit the optical time service information to at least one observation instrument 40. The following explains the structure and function of the time service information processing and forwarding apparatus 20.
As shown in fig. 3, a time service information processing and forwarding apparatus 20 according to one or more embodiments of the present specification includes:
a second photoelectric conversion unit 21, configured to receive the optical time service information, perform photoelectric conversion on the optical time service information, perform electro-optical conversion again to obtain converted optical time service information, and transmit the converted optical time service information to the optical signal forwarding unit 23;
and the optical signal forwarding unit 23 is configured to forward the converted optical time service information to at least one observation instrument 40.
In this embodiment, the optical signal output end of the first photoelectric conversion unit 11 is connected to the optical signal input end of the second optical conversion unit 21, the optical signal output end of the second optical conversion unit 21 is connected to the optical signal input end of the optical signal forwarding unit 23, and the optical signal forwarding unit 23 is connected to the optical signal transmission interface of the observation instrument through an optical fiber. The optical time service information output by the first photoelectric conversion unit 11 is transmitted to the second photoelectric conversion unit 21 through an optical fiber, the second photoelectric conversion unit 21 receives the optical time service information, performs photoelectric conversion on the optical time service information to obtain electric time service information, performs electro-optical conversion on the electric time service information to obtain optical time service information, and transmits the converted optical time service information to an observation instrument equipped with an optical signal transmission interface through an optical signal conversion unit 23.
In order to facilitate the flexible design and implementation of the circuit interface, the optical signal communication debugging and judgment is added to the time service information and forwarding device 20 to facilitate the system networking debugging, and therefore, it is necessary to perform the photoelectric conversion on the received optical time service information, then perform the electro-optical conversion, and output the converted optical time service information. During the signal conversion process, the signal distortion degree and the time delay degree can be tested, and when a fault occurs, whether the optical transmission is in fault or the forwarding process is in fault can be determined. Although two conversions are needed, the power consumption is low, and the scheme is reasonable. If the optical receiver is used for directly receiving and outputting the optical time service information, the optical receiver needs to be additionally configured, so that the cost is increased, and the power consumption is increased.
In this embodiment, the time service information processing and forwarding device 20 further includes:
an optical signal shaping unit 22, configured to shape the converted optical time service information to obtain shaped optical time service information, and transmit the shaped optical time service information to an optical signal forwarding unit 23;
and the optical signal forwarding unit 23 is configured to forward the shaped optical time service information to at least one observation instrument 40.
In this embodiment, the optical signal output terminal of the second photoelectric conversion unit 21 is connected to the signal input terminal of the optical signal shaping unit 22, and the signal output terminal of the optical signal shaping unit 22 is connected to the optical signal forwarding unit 23. The second photoelectric conversion unit 21 receives the optical time service information, performs photoelectric and electro-optical conversion on the optical time service information to obtain converted optical time service information, the input optical signal shaping unit 22 performs shaping processing, and the shaped optical time service information is forwarded to at least one observation instrument through the optical signal forwarding unit 23. By means of signal shaping, signal interference can be reduced, and accuracy of optical time service information is improved.
In some embodiments, the optical signal forwarding unit 23 is at least one optical signal transmission circuit, and the at least one optical signal transmission circuit is connected to an optical signal transmission interface of at least one observation instrument, so that the observation instrument can receive optical time service information from the time service system. And after receiving the light time service information, the observation instrument processes the light time service information to obtain a time service signal and a pulse per second signal, thereby realizing time synchronization.
In the present embodiment, for an observation instrument that is far away from the time service information processing and forwarding device 20 (for example, a distance greater than 1 km), the optical signal forwarding unit 23 of the time service information processing and forwarding device 20 is connected to the optical signal transmission interface of the observation instrument via an optical fiber, and provides the observation instrument with optical time service information.
In this embodiment, for an observation instrument that is close to the time information processing and transmitting device 20, long-distance transmission of optical signals is not required, and time information can be received by connection via a signal line. The time service information processing and forwarding unit 20 includes:
a second photoelectric conversion unit 21, configured to receive the light time service information, perform photoelectric conversion on the light time service information, and obtain time service information;
and the electric signal forwarding unit 26 is used for forwarding the time service information to at least one observation instrument.
In this embodiment, the electrical signal output end of the second photoelectric conversion unit 21 is connected to the electrical signal forwarding unit 26, and the electrical signal forwarding unit 26 is connected to the electrical signal transmission interface of the observation instrument through a signal line. The second photoelectric conversion unit 21 receives the optical time service information, performs photoelectric conversion on the optical time service information to obtain time service information in an electrical form, and transmits the time service information to the observation instrument equipped with the electrical signal transmission interface through the electrical signal forwarding unit 26 to provide time service information for the observation instrument that is close to the time service information processing and forwarding device 20.
In the present embodiment, if the time service information receiving and processing device 10 modulates the second pulse signal, and the time service information processing and transmitting unit 20 needs to demodulate the modulated second pulse signal, the time service information processing and transmitting unit 20 further includes:
the second processing unit 25 is configured to demodulate the pulse per second signal to obtain a demodulated pulse per second signal;
and the electric signal forwarding unit 26 is used for forwarding the time service signal and the demodulated pulse per second signal to at least one observation instrument.
In this embodiment, the electrical signal output terminal of the second photoelectric conversion unit 21 is connected to the signal input terminal of the second processing unit 25, and the signal output terminal of the second processing unit 25 is connected to the electrical signal forwarding unit 26. The second photoelectric conversion unit 21 receives the optical time service information, performs photoelectric conversion on the optical time service information to obtain time service information, demodulates the pulse-per-second signal in the time service information to obtain a demodulated pulse-per-second signal, and transmits the time service signal and the demodulated pulse-per-second signal to the observation instrument equipped with the electrical signal transmission interface through the electrical signal forwarding unit 26.
In some embodiments, the second processing unit 25 comprises:
and the demodulation circuit is used for demodulating the pulse per second signal to obtain a demodulated pulse per second signal. It is easy to understand that the demodulation process of the pulse per second signal corresponds to the modulation processing method, that is, the modulation circuit of the time service information receiving and processing unit 10 performs the modulation process on the pulse per second signal, and the demodulation circuit performs the corresponding demodulation process on the modulated pulse per second signal to recover the original pulse per second signal. In some embodiments, the demodulation circuit demodulates the pulse-per-second signal from the pulse-per-second square wave signal with a predetermined frequency according to a predetermined duty cycle, for example, determines the square wave signal with a first duty cycle from the pulse-per-second square wave signal with a frequency of 1KHz, thereby determining the time of the whole second and implementing demodulation processing of the pulse-per-second signal; optionally, if the first duty ratio is 80%, the position of the pulse-per-second signal may be determined by detecting a falling edge of the square wave signal with the duty ratio of 80%, and the local pulse-per-second signal may be generated according to the determined pulse-per-second signal.
In this embodiment, the time service information processing and forwarding unit 20 further includes:
an electric signal shaping unit 24, configured to shape the time service information to obtain shaped time service information; the shaped time service information comprises a shaped time service signal and a pulse per second signal;
a second processing unit 25, configured to demodulate the shaped pulse-per-second signal to obtain a demodulated pulse-per-second signal;
and the electric signal forwarding unit 26 is used for forwarding the shaped time service signal and the demodulated pulse per second signal to at least one observation instrument.
In this embodiment, the electrical signal output end of the second photoelectric conversion unit 21 is connected to the signal input end of the electrical signal shaping unit 24, the signal output end of the electrical signal shaping unit 24 is connected to the signal input end of the second processing unit 25, and the signal output end of the second processing unit 25 is connected to the electrical signal forwarding unit 26. The second photoelectric conversion unit 21 receives the optical time service information, performs photoelectric conversion on the optical time service information to obtain the time service information, transmits the time service information to the electrical signal shaping unit 24 for shaping, transmits the shaped time service information to the second processing unit 25, demodulates the shaped pulse-per-second signal by the second processing unit 25, and transmits the shaped time service signal and the demodulated pulse-per-second signal to the observation instrument equipped with the electrical signal transmission interface through the electrical signal forwarding unit 26 after demodulation. By means of signal shaping, signal interference can be reduced, and accuracy of time service information is improved.
In some embodiments, the electrical signal forwarding unit 26 is at least one electrical signal transmission circuit, and the at least one electrical signal transmission circuit is connected to an electrical signal transmission interface of at least one observation instrument, so that the observation instrument can receive time service information from the time service system. And after receiving the time service signal, the observation instrument processes the time service signal to obtain the time service signal and a pulse per second signal, thereby realizing time synchronization.
In some embodiments, the observation instrument is an instrument that needs time service information, such as a seismic observation instrument, a surveying and mapping instrument, and the embodiment is not particularly limited.
As shown in fig. 6, in an application scenario, a plurality of seismic observation instruments installed at the bottom of a dam, a plurality of seismic observation instruments in a mine tunnel, or a plurality of seismic observation instruments in a tunnel may be respectively constructed into a distributed seismic observation system, and each seismic observation instrument in the distributed seismic observation system needs to satisfy synchronous time service. The remote time service system of the embodiment is utilized, the time service information receiving and processing device is arranged near a distance time service source, the time service information processing and forwarding device is arranged near an earthquake observation instrument, the time service information processing and forwarding device is connected with the time service information processing and forwarding device through an optical fiber, the earthquake observation instrument with the distance time service information processing and forwarding device within a first range is connected with the time service information processing and forwarding device through a signal wire to obtain time service information, and the earthquake observation instrument with the distance time service information and processing device outside the first range is connected with the time service information processing and forwarding device through the optical fiber to obtain optical time service information. Therefore, synchronous time service can be realized for at least one earthquake observation instrument far away from the time service source.
Optionally, the optical fiber may be a single mode optical fiber, and the time service information receiving and processing device 10 and the time service information processing and forwarding device 20 are connected by the single mode optical fiber, so that ultra-long distance transmission of optical time service information can be realized, time service information can be provided for at least one observation instrument far away from the time service source 30, and synchronous time service information can be provided for each observation instrument in the distributed observation instrument system far away from the time service source 30. In some embodiments, the transmission distance of the optical time service information can reach 40 kilometers.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the spirit of the present disclosure, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present description as described above, which are not provided in detail for the sake of brevity.
In addition, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown in the provided figures, for simplicity of illustration and discussion, and so as not to obscure one or more embodiments of the disclosure. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the understanding of one or more embodiments of the present description, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the one or more embodiments of the present description are to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that one or more embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.
It is intended that the one or more embodiments of the present specification embrace all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of one or more embodiments of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (10)
1. A remote time service system for a scope, comprising:
the time service information receiving and processing device is used for receiving the time service information of a time service source, and performing electro-optical conversion on the time service information to obtain optical time service information; the time service information at least comprises a time service signal and a pulse per second signal, and the optical time service information at least comprises an optical time service signal and an optical pulse per second signal;
and the time service information processing and forwarding device is used for receiving the optical time service information and forwarding the optical time service information to at least one observation instrument.
2. The system according to claim 1, wherein the time service information receiving and processing device comprises:
the serial interface unit is used for receiving the time service signal and transmitting the time service signal to the first photoelectric conversion unit;
and the first photoelectric conversion unit is used for performing electro-optical conversion on the time service signal to obtain the optical time service signal, and transmitting the optical time service signal to the time service information processing and forwarding device.
3. The system according to claim 2, wherein the time service information receiving and processing device further comprises:
the first processing unit is used for receiving the pulse per second signal, modulating the pulse per second signal to obtain a modulated pulse per second signal, and transmitting the modulated pulse per second signal to the first photoelectric conversion unit;
and the first photoelectric conversion unit is used for performing electro-optical conversion on the modulated pulse per second signal to obtain the optical pulse per second signal, and transmitting the optical pulse per second signal to the time service information processing and forwarding device.
4. The system according to claim 3, wherein the time service information receiving and processing device further comprises:
the driving unit is used for amplifying the modulated pulse-per-second signal and transmitting the amplified pulse-per-second signal to the first photoelectric conversion unit;
the first photoelectric conversion unit is used for performing electro-optical conversion on the amplified pulse-per-second signal to obtain an amplified optical pulse-per-second signal, and transmitting the amplified optical pulse-per-second signal to the time service information processing and forwarding device.
5. The system according to claim 3 or 4, wherein the first processing unit comprises:
and the modulation circuit is used for modulating the pulse per second signal to obtain a modulated pulse per second signal, the modulated pulse per second signal is a pulse per second square wave signal with a preset frequency, and the square wave corresponding to the whole second time in the pulse per second signal has a preset duty ratio.
6. The system according to claim 1, wherein the time service information processing and forwarding device comprises:
the second photoelectric conversion unit is used for receiving the optical time service information, performing photoelectric conversion on the optical time service information, performing electro-optical conversion on the optical time service information to obtain converted optical time service information, and transmitting the converted optical time service information to the optical signal forwarding unit;
and the optical signal forwarding unit is used for forwarding the converted optical time service information to at least one observation instrument.
7. The system according to claim 6, wherein said time service information processing and forwarding device further comprises:
an optical signal shaping unit, configured to shape the converted optical time service information to obtain shaped optical time service information, and transmit the shaped optical time service information to the optical signal forwarding unit;
and the optical signal forwarding unit is used for forwarding the shaped optical time service information to at least one observation instrument.
8. The system of claim 1, wherein the time service information processing and forwarding unit comprises:
the second photoelectric conversion unit is used for receiving the optical time service information and performing photoelectric conversion on the optical time service information to obtain the time service information;
and the electric signal forwarding unit is used for forwarding the time service information to at least one observation instrument.
9. The system of claim 8, wherein the time service information processing and forwarding unit further comprises:
the second processing unit is used for demodulating the pulse per second signal to obtain a demodulated pulse per second signal;
and the electric signal forwarding unit is used for forwarding the time service signal and the demodulated pulse-per-second signal to at least one observation instrument.
10. The system of claim 8, wherein the time service information processing and forwarding unit further comprises:
the electric signal shaping unit is used for shaping the time service information to obtain shaped time service information; the shaped time service information comprises a shaped time service signal and a pulse per second signal;
the second processing unit is used for demodulating the shaped pulse-per-second signal to obtain a demodulated pulse-per-second signal;
and the electric signal forwarding unit is used for forwarding the shaped time service signal and the demodulated pulse per second signal to at least one observation instrument.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020493935.9U CN211628026U (en) | 2020-04-07 | 2020-04-07 | Remote time service system of observation instrument |
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| CN202020493935.9U CN211628026U (en) | 2020-04-07 | 2020-04-07 | Remote time service system of observation instrument |
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