CN210864050U

CN210864050U - Time synchronization device of rubidium atomic clock and synchronization trigger

Info

Publication number: CN210864050U
Application number: CN201921450715.1U
Authority: CN
Inventors: 范百兴; 马一心; 杨振; 李丛
Original assignee: Information Engineering University of PLA Strategic Support Force
Current assignee: Information Engineering University of PLA Strategic Support Force
Priority date: 2019-09-02
Filing date: 2019-09-02
Publication date: 2020-06-26
Anticipated expiration: 2029-09-02

Abstract

The utility model relates to a time synchronizer and a synchronous trigger of a rubidium atomic clock, which comprises a GNSS receiver, a time interval counter and a processor; the input end of the GNSS receiver is connected with a GNSS time system, the first input end of the time interval counter is connected with the output end of the GNSS receiver, and the second input end of the time interval counter is connected with a rubidium atomic clock to be synchronized; the input end of the processor is connected with the output end of the time interval counter, and the output end of the processor is used for being connected with the rubidium atomic clock to be synchronized. Because the GNSS time system has better long-term stability and no accumulated error, the time synchronization is carried out on the rubidium atomic clock by taking the GNSS time system as a signal reference, the time accuracy of the rubidium atomic clock is improved, and the accuracy of a synchronous trigger signal can be effectively ensured by the synchronous trigger formed by the GNSS time system.

Description

Time synchronization device of rubidium atomic clock and synchronization trigger

Technical Field

The utility model relates to a time synchronizer and synchronous trigger of rubidium atomic clock.

Background

In the industries of aerospace, weapon manufacturing, large-scale engineering manufacturing and the like, high requirements are put forward on large-size dynamic measurement and measurement, and the method is mainly embodied in three aspects: firstly, the requirement on the measurement precision of the target position is further improved, and the precision is improved to the micron level from the traditional millimeter level and submillimeter level; secondly, converting two-dimensional and three-dimensional coordinates of a point location into attitude parameters (from one dimension to three dimensions) of a to-be-measured object relative to a coordinate system, namely realizing measurement of multiple degrees of freedom; and thirdly, obtaining static parameters of the measured target, and converting the static parameters into information such as real-time dynamic parameters, historical parameters and even future prediction parameters. The attitude of the target is dynamically measured by networking and combining a plurality of laser trackers, the measurement precision is high, the range is large, the current pose of the space target can be continuously measured and obtained in real time, and the influence of the environment is small; the networking combination of a plurality of laser trackers needs the same trigger time, the requirement on trigger pulse is high, a rubidium atomic clock is generally adopted for frequency division triggering, but the rubidium atomic clock has good short-term stability, the long-term stability is not enough, frequency drift can be generated along with time, and accumulated errors exist, so that the time synchronization correction of the rubidium atomic clock is needed regularly.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a time synchronizer and a synchronous trigger of rubidium atomic clock for realize the accurate time synchronization to the rubidium atomic clock.

In order to achieve the above object, the present invention provides a time synchronization device for rubidium atomic clock, which comprises a GNSS receiver, a time interval counter and a processor; the input end of the GNSS receiver is connected with a GNSS time system, the first input end of the time interval counter is connected with the output end of the GNSS receiver, and the second input end of the time interval counter is connected with a rubidium atomic clock to be synchronized; the input end of the processor is connected with the output end of the time interval counter, and the output end of the processor is used for being connected with the rubidium atomic clock to be synchronized.

The method has the advantages that the GNSS time system has good long-term stability and no accumulated error, and is used as a signal reference to perform time synchronization on the rubidium atomic clock, so that the time accuracy of the rubidium atomic clock is improved.

Furthermore, in order to better realize the adjustment of the rubidium atomic clock to be synchronized, the output end of the processor is connected with the rubidium atomic clock to be synchronized through a digital-to-analog converter and a filter.

The utility model provides a synchronous trigger, which comprises a rubidium atomic clock, a GNSS receiver, a time interval counter, a processor and a power interface; the input end of the GNSS receiver is used for connecting a GNSS time system, the first input end of the time interval counter is connected with the output end of the GNSS receiver, and the second input end of the time interval counter is connected with the output end of the rubidium atomic clock; the input end of the processor is connected with the output end of the time interval counter, and the output end of the processor is connected with the input end of the rubidium atomic clock; the power interface is connected with the rubidium atomic clock, the GNSS receiver, the time interval counter and the processor in a power supply mode.

The method has the advantages that the GNSS time system has good long-term stability and no accumulated error, and is used as a signal reference to carry out time synchronization on the rubidium atomic clock, so that the time accuracy of the rubidium atomic clock is improved, and the accuracy of a synchronous trigger signal can be effectively guaranteed by the aid of the synchronous trigger.

Further, in order to better realize synchronous adjustment of the rubidium atomic clock, the output end of the processor is connected with the rubidium atomic clock through a digital-to-analog converter and a filter.

Further, in order to provide multiple groups of signals synchronously triggered by the rubidium atomic clock, the synchronous trigger further comprises a frequency divider, and the rubidium atomic clock is connected with equipment to be triggered through the frequency divider.

Furthermore, in order to maintain the continuous power supply of the rubidium atomic clock and avoid the frequency offset caused by the shutdown and the startup, the synchronous trigger further comprises a battery module, and the battery module is in power supply connection with the rubidium atomic clock.

Further, in order to facilitate signal stability, overall protection and movement of the synchronous trigger, the synchronous trigger comprises a shell, and the rubidium atomic clock, the GNSS receiver, the time interval counter, the processor and the battery module are all arranged inside the shell.

Further, in order to better radiate the heat of the battery module, the shell is provided with radiating holes.

Drawings

Fig. 1 is a schematic structural diagram of a time synchronization device of a rubidium atomic clock according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiment of the device is as follows:

the utility model provides a time synchronizer of rubidium atomic clock, as shown in figure 1, comprising a GNSS receiver, a time interval counter and a processor; the input end of the GNSS receiver is used for connecting a GNSS time system, the first input end of the time interval counter is connected with the output end of the GNSS receiver, and the second input end of the time interval counter is connected with the rubidium atomic clock to be synchronized; the input end of the processor is connected with the output end of the time interval counter, and the output end of the processor is connected with the rubidium atomic clock to be synchronized through the digital-to-analog converter and the filter.

And (3) obtaining a 1pps pulse signal by utilizing a GNSS receiver as a reference standard, and simultaneously inputting the reference standard and the 1pps pulse signal generated by the rubidium atomic clock to be synchronized into a high-resolution time interval counter for measuring time interval errors. When measuring time interval errors, counting and counting pulse signals received by the GNSS receiver and pulse signals generated by the rubidium atomic clock respectively; for example, for a pulse signal received by a GNSS receiver, the rising edge of the first 1pps pulse is used as a door opening signal of a master door, the rising edge of the second 1pps pulse is used as a door closing signal, high-frequency counting pulses are used for filling between the two pulse rising edges, and the number of the filling pulses is accumulated by a counter. And converting the number of pulses of the pulse signal received by the GNSS receiver and the pulse signal generated by the rubidium atomic clock to obtain the time interval between the pulse signal received by the GNSS receiver and the pulse signal generated by the rubidium atomic clock.

And sending the time interval into a processor for processing, outputting a frequency control signal by a digital-to-analog converter (D/A) when the time interval exceeds a threshold value, and correcting the output frequency of the rubidium atomic clock after low-pass filtering.

After the rubidium atomic clock works for a period of time, the frequency is measured to be f1, at this time, the rubidium atomic clock is shut down for a period of time, after the rubidium atomic clock is started for a period of time again, the frequency f2 is measured, the frequency reproducibility is characterized by the relative frequency deviation between f2 and f1, and in consideration of the influence of the frequency reproducibility, the rubidium atomic clock is kept to be continuously powered after being synchronized, so that the frequency deviation caused by shutdown and startup is avoided.

Trigger embodiment:

the utility model provides a synchronous trigger, which comprises an aluminum alloy metal shell, wherein the shell is provided with a power interface, and a rubidium atomic clock, a GNSS receiver, a time interval counter and a processor are arranged inside the shell; the input end of the GNSS receiver is used for connecting a GNSS time system, the output end of the GNSS receiver is connected with the first input end of the time interval counter, and the output end of the rubidium atomic clock is connected with the second input end of the time interval counter; the input end of the processor is connected with the output end of the time interval counter, and the output end of the processor is connected with the input end of the rubidium atomic clock; the power interface is connected with the rubidium atomic clock, the GNSS receiver, the time interval counter and the processor in a power supply mode.

The synchronous trigger also comprises a frequency divider, the rubidium atomic clock is connected with a device to be triggered through the frequency divider, and the device to be triggered can be a plurality of laser trackers.

The synchronous trigger further comprises a battery module, and the battery module is connected with the rubidium atomic clock in a power supply mode. The rubidium atomic clock can be powered by an external power supply and also can be powered by a battery module of the synchronous trigger. The battery module can be detached and moved together with the rubidium atomic clock according to actual requirements. Because the battery module can generate heat in the power supply process, the battery module and the rubidium clock need to keep a certain distance, and a plurality of heat dissipation holes are formed in the shell for heat dissipation.

In this embodiment, the housing of the synchronization trigger is an aluminum alloy metal housing, as another embodiment, the housing may also be made of other materials, such as plastic, and of course, the synchronization trigger may not be provided with a housing.

Because the online connection with a plurality of trackers is needed to complete the networking, a plurality of trigger ports connected with the frequency divider are arranged on the shell, for example, 4 trigger ports, the output signal of the rubidium atomic clock can be divided into four by one, and the four trigger ports pass through four 5-pin LEMO trigger interfaces (the trigger interface is a standard trigger interface of a Leica AT930/960 series tracker, and other models can be additionally provided with conversion interfaces).

As other embodiments, an antenna interface, a USB interface, and the like need to be further disposed on the housing, where the antenna interface is convenient for the GNSS receiver to receive signals, and the USB interface is convenient for the synchronous trigger to communicate with the outside.

The present invention has been described with reference to specific embodiments, but the present invention is not limited to the described embodiments. The utility model discloses a basic thinking lies in realizing the accurate time synchronization to rubidium atomic clock through GNSS time system, does not do the restrictive requirement to specific control strategy, does not deviate from the utility model discloses a change, modification, replacement and the variant that go on the embodiment under the condition of principle and spirit still fall into the utility model discloses a within the scope of protection.

Claims

1. The time synchronization device of the rubidium atomic clock is characterized by comprising a GNSS receiver, a time interval counter and a processor; the input end of the GNSS receiver is connected with a GNSS time system, the first input end of the time interval counter is connected with the output end of the GNSS receiver, and the second input end of the time interval counter is connected with a rubidium atomic clock to be synchronized; the input end of the processor is connected with the output end of the time interval counter, and the output end of the processor is used for being connected with the rubidium atomic clock to be synchronized.

2. The time synchronization device of rubidium atomic clock as claimed in claim 1, wherein the output end of the processor is connected to the rubidium atomic clock to be synchronized through a digital-to-analog converter and a filter.

3. A synchronous trigger is characterized by comprising a rubidium atomic clock, a GNSS receiver, a time interval counter, a processor and a power interface; the input end of the GNSS receiver is used for connecting a GNSS time system, the first input end of the time interval counter is connected with the output end of the GNSS receiver, and the second input end of the time interval counter is connected with the output end of the rubidium atomic clock; the input end of the processor is connected with the output end of the time interval counter, and the output end of the processor is connected with the input end of the rubidium atomic clock; the power interface is connected with the rubidium atomic clock, the GNSS receiver, the time interval counter and the processor in a power supply mode.

4. The synchronous flip-flop according to claim 3, wherein an output of said processor is connected to said rubidium atomic clock via a digital-to-analog converter and a filter.

5. The synchronous flip-flop according to claim 4, further comprising a frequency divider through which said rubidium atomic clock is used to connect to a device to be triggered.

6. The synchronous trigger of claim 3, further comprising a battery module in electrical communication with the rubidium atomic clock.

7. The synchronized trigger of claim 6, wherein the synchronized trigger comprises a housing, and wherein the rubidium atomic clock, the GNSS receiver, the time interval counter, the processor, and the battery module are disposed within the housing.

8. The simultaneous trigger of claim 7, wherein said housing is provided with a heat dissipation aperture.