A method for measuring the transmission delay of 1pps signal at the end node of a time-frequency link

Abstract

The invention provides a method for measuring the transmission delay of a 1pps signal at the end node of a time-frequency link, which belongs to the technical field of time-frequency systems. The invention uses a test device with high-precision time keeping ability to collect the time difference between the 1pps signal of the terminal node and the 1pps signal of the central node, obtains the calculated value of the transmission delay through iterative calculation, and eliminates the accidental measurement error, and then calculates the target transmission delay value. , to measure the transmission delay of the 1pps signal at the end node of the time-frequency link relative to the 1pps signal at the central node. This method can provide accurate measurement of the time-frequency signal transmission delay of the end node of the master-slave time-frequency system with a transmission distance of 100 meters to 10 kilometers, and can effectively realize that the end node of the newly built time-frequency link is 1pps relative to the central node. Determination of the initial delay value of 1pps; through periodic measurement, the measurement of the delay drift value caused by factors such as external temperature changes and link aging can be realized, and then the model of the delay drift law can be improved.

Description

technical field [0001] The invention relates to the technical field of time-frequency systems, in particular to a method for measuring the transmission delay of a 1 pps signal at an end node of a time-frequency link. Background technique [0002] The master-slave time-frequency signal transmission technology is widely used in satellite navigation, aerospace measurement and control, radar networking, astronomical observation and many other fields. In these application fields, it is often necessary to transmit the 1pps signal from the central node to nodes hundreds of meters or even a few kilometers away. However, it is difficult to accurately measure the transmission delay of the 1pps signal of the end node relative to the 1pps signal of the central node. Therefore, it is necessary to accurately measure the transmission delay of the end node of 1pps relative to the central node of 1pps in time-frequency transmission. [0003] There are currently three commonly used methods th...

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Problems solved by technology

[0002] Master-slave time-frequency signal transmission technology is widely used in satellite navigation, aerospace measurement and control, radar networking, astronomical observation and many other fields. In these application fields, it is often necessary to transmit the 1pps signal of the central node to nodes hundreds of meters or even kilometers away , but it is difficult to accurately measure the transmission delay of the 1pps signal at the end node relative to the 1pps signal at the center node. Therefore, it is necessary to accurately measure the transmission delay of 1pps at the end node relative to 1pps at the center node in time-frequency transfer

[0003] There are currently three commonly used methods that can provide support for the measurement of 1pps signal transmission delay at the end node of the time-frequency link, but all of them have certain shortcomings: the satellite two-way time-frequency transfer method can provide nanosecond time-frequency signals as benchmark, but its cost is high, satellite lease and electromagnetic signal launch application procedures are complicated, and the project implementation is not convenient enough; the GNSS common-view frequency transfer method can provide a time-frequency signal of about 10 nanoseconds as a benchmark, but its accuracy index is insufficient; The optical fiber two-way time-frequency transfer method can provide sub-nanosecond time-frequency signals as a reference, but it is difficult to lay optical fibers as the distance increases, and the project implementation is not convenient enough

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