Time service system time comparison accuracy real-time measurement device and method

Abstract

The invention discloses a time service system time comparison accuracy real-time measurement device and method. The time service system time comparison accuracy under different baseline conditions can be measured in real time. The equipment delay of navigation signal receiving equipment, a navigation signal receiving equipment antenna, an antenna cable and time service system, a time service system antenna and an antenna cable requires to be accurately calibrated before starting of measurement and the phase center of the antenna is accurately calibrated. Real-time solving of the clock difference data can be realized by the original observation data outputted by the navigation signal receiving equipment and the clock difference data outputted by time interval measurement equipment and other information so that the problems of no clock difference truth value and measurement real-time performance under different baseline conditions can be solved, and real-time measurement of the time service system time comparison accuracy under different baseline conditions can be realized.

Description

technical field [0001] The invention relates to the field of satellite positioning and navigation technology and time-frequency measurement, in particular to a real-time measurement device and method for time comparison accuracy of a time service system. Background technique [0002] A unified time reference is the premise and guarantee for multi-user collaborative work. The timing system traces the internal clock to the satellite clock by receiving space navigation signals, and provides clock services to different access users. The consistency of the access user time reference is determined by the timing The performance of the system is determined. [0003] The clock signal output by the time service system to the user generally includes a second pulse signal. For multiple time service systems in the same place, the time comparison accuracy between multiple time service systems can be directly measured through time interval measurement equipment. For multiple time service s...

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Problems solved by technology

[0005] The transport clock method refers to using a high-stable clock source as a reference, and sequentially transporting the clock source to the timing system to be tested. The high-stable clock source has high requirements on the transportation conditions and environment, and the stability of the clock source depends on the continuous transportation process. It is difficult to get an effective guarantee, so this method is less feasible

[0006] The common view method refers to observing the same satellite at the same observation time, and then completing the time comparison between users through data exchange. The minimum interval of the time comparison results output by this method is 16 minutes and the output results are obtained by smoothing the median value, and the real-time performance is poor. , cannot fully reflect the state of the clock, but it has certain reference significance for the measurement of the time comparison accuracy of the timing system

[0007] The optical fiber method refers to using optical fiber as the time comparison signal transmission medium to complete the two-way time comparison. This method is affected by the laying of optical fiber links and cannot fully meet the measurement of the time comparison accuracy of the timing system at any position.

[0008] The two-way method refers to transmitting the time comparison signal through the geosynchronous orbit satellite to complete the two-way time comparison. This method is affected by the resources of the geosynchronous orbit satellite and cannot fully meet the measurement of the time comparison accuracy of the time service system at any position.

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