Frequency stability control and compensation method for automatically keeping time in complex environment

A technology with stable frequency and complex environment, applied in the direction of stable frequency mechanism, stable frequency mechanism, mechanically driven clock, etc., to achieve the effect of improving product reliability, ensuring accuracy and credibility

Inactive Publication Date: 2011-11-23
BEIJING INST OF ELECTRONICS SYST ENG
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of the accuracy of punctuality and time service in a complex environment, the present invention proposes a frequency stabilization control and compensation method for autonomous timekeeping in a complex environment

Method used

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  • Frequency stability control and compensation method for automatically keeping time in complex environment
  • Frequency stability control and compensation method for automatically keeping time in complex environment

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Experimental program
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specific Embodiment approach 1

[0009] Specific implementation mode one: the steps of this implementation mode are as follows:

[0010] Step 1: First, the ground timing instrument receives GPS, GLONASS, Beidou satellite signals and B-code signals, obtains external standard time, and selects one of the time signals as the reference time source; secondly, uses a 10MHz constant temperature crystal oscillator as the internal clock of the ground timing instrument The frequency source, through the frequency division circuit to generate 1PPS second pulse for clock counting as the internal time; then use the 1PPS signal demodulated by satellite time as a reference to calibrate the clock rate, and save the calibration parameters;

[0011] Step 2: Use the reference time source to synchronize the internal time, and obtain the initial time information, and then generate the clock face time information through the internal clock count;

[0012] Step 3: After successful time synchronization, use the constant temperature c...

specific Embodiment approach 2

[0013] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in the time synchronization stage, how to select one as the reference time source from the time sources of GPS, GLONASS, Beidou satellite signal and B code signal, and the deviation of the reference time source Determines the systematic deviation of the output time of the ground time service instrument;

[0014] Due to possible uncertain factors in the signal source, transmission, and decoding process, the demodulated time signal is not always valid. In order to ensure the accuracy and reliability of the output time of the ground time service instrument, the availability of the reference time source should be strictly judged when performing time synchronization.

[0015] Step 1 selects one of the time signals from GPS, GLONASS, Beidou satellite signal and B code signal as the reference time source, and the method for judging the reference time source is as follows:

[00...

specific Embodiment approach 3

[0039] Specific implementation mode three: this implementation mode combines figure 1 Note that the difference between this embodiment and the specific embodiment 1 or 2 is that in the process of keeping time, the clock circuit accumulates the travel time through pulses. If there is strong external interference, it may cause the travel time to be fast or slow, and the time jumps suddenly. The error of the output time may exceed the limit. In the case of a complex environment, such a small probability event may occur if you are punctual for a long time. A single clock cannot judge itself.

[0040] Then in step 3, the constant temperature crystal oscillator of the ground timing instrument adopts three constant temperature crystal oscillators for self-timekeeping to form three clocks, which work independently and in parallel, and compare the time. If the data are consistent, reset the counting frequency divider to zero and proceed to the next step. Phase comparison. If not, re...

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Abstract

The invention provides a frequency stability control and compensation method for automatically keeping time in a complex environment, relates to a high-precision time-keeping technology and solves the problem of low precision of time keeping and time serving in the complex environment. The method comprises the following steps of: firstly, receiving an external signal by a ground time serving instrument, acquiring external standard time, selecting a time signal as a reference time source, then adopting a 10 MHz constant-temperature crystal vibrator as a frequency source of an internal clock, generating 1 pulse per second (PPS) pulse by a frequency dividing circuit to allow the clock to count, using the count as the internal time, calibrating the clock rate by utilizing a 1PPS signal demodulated by satellite time as the reference, and saving a calibration parameter; secondly, synchronizing the internal time by utilizing the reference time source, acquiring initial time information, and generating clock time information by internal clock counting; and finally, after successfully synchronizing the time, automatically keeping time through the constant-temperature crystal vibrator to enter the time keeping state, correcting the clock rate by using the calibration parameter, and outputting the final time. The method is suitable for keeping time in the complex environment.

Description

technical field [0001] The invention relates to a high-precision timekeeping technology. Background technique [0002] The main function of the ground timing instrument is to provide accurate and reliable standard time and frequency signals, but to maintain continuous and stable clock signal output in harsh and complex environments, to enter a stable state in a short time, to provide highly reliable time and frequency signals, and Achieving the specified punctual accuracy requirements is a very critical requirement. Therefore, the key technology of the clock in this project is clarified-high-precision timekeeping technology in complex environment. Contents of the invention [0003] In order to solve the problem of the precision of punctuality and time service in a complex environment, the present invention proposes a frequency stabilization control and compensation method for autonomous timekeeping in a complex environment. [0004] Step 1: First, the ground timing instr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04B17/22G04B17/20
Inventor 孙进赵明程鹏邓昕才王凯杨永健
Owner BEIJING INST OF ELECTRONICS SYST ENG
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