Multi-station high-precision time-frequency synchronization method
A time-frequency, high-precision technology, applied in the direction of synchronization device, multiplex communication, time-division multiplex system, etc., to achieve the effect of simple system, simple synchronization scheme, and high-precision measurement
Active Publication Date: 2019-06-28
10TH RES INST OF CETC
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[0004] The purpose of the present invention is to provide a multi-station high-precision time-frequency synchronization method with a simple synchronization scheme and high time-frequency synchronization accuracy in view of the deficiencies in the prior art. Visible, based on the microwave link to achieve high-precision time and frequency synchronization between the stations of the entire system
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[0013] refer to Figure 1-Figure 2 . In the example described below, its operating principle of the multi-station high-precision time-frequency synchronization method of the present invention is: first, between each station, realize the relative distance high-precision measurement between the stations based on the relative positioning method by receiving satellite navigation signals; secondly, the main The station uses the weather meter to measure the surrounding temperature, humidity and air pressure to realize accurate estimation of the atmospheric delay of the transmission path. The master station uses its own rubidium clock as a reference clock, and the spread spectrum ranging signal generation module generates the spread spectrum ranging signal , through the transmitting radio frequency front end, transmit to the secondary station 1 through the antenna (visible to the main station); the secondary station 1 receiving antenna receives the ranging signal, and sends it to the...
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The invention discloses a multistation high-precision time frequency synchronization method. Through application of the method, the multistation high-precision time frequency synchronization problem under the condition that a master station and partial secondary stations are invisible can be effectively solved. The technical scheme of the method is realized by the following steps that the master station takes a rubidium clock as reference clock, generates a spread spectrum distance measurement signal and transmits the distance measurement signal to a first secondary station; the first secondary station receives the distance measurement signal, finishes capturing and tracking and directly sends a code frequency control word output by a code loop filter to a direct digital synthesizer DDS, and the DDS carries out phase discrimination on an output sinusoidal wave signal and an output value of a constant temperature crystal oscillator of the first secondary station, thereby realizing frequency synchronization of the reference clocks of two stations, and adjusts 1PPS based on time delay measurement; and the first secondary station generates the spread spectrum distance measurement signal based on the synchronized reference clock and transmits the distance measurement signal to a second secondary station, and the second secondary station realizes the time frequency synchronization of the reference clocks of two stations through utilization of the method the same as that employed by the first secondary station, and so on, the high-precision time frequency synchronization among the stations of a whole network is realized.
Description
technical field [0001] The invention relates to a multi-station high-precision time-frequency synchronization method, which can be applied to technical fields such as ground-based regional navigation and radar arrays. Background technique [0002] With the continuous increase in the demand for collaborative work between stations, there are higher requirements for high-precision time synchronization between multiple stations in multi-node systems such as ground-based navigation and radar arrays. At present, the time synchronization methods between stations mainly include the common view method of navigation satellites and the two-way time-frequency transfer based on communication satellites. Among them, the navigation satellite common view method requires two stations to receive navigation satellite signals at the same time to achieve high-precision time synchronization between stations. Due to the different transmission paths of the two stations, the additional time delay er...
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IPC IPC(8): H04J3/06H04W56/00
CPCH04J3/0638H04W56/001
Inventor 杨峻巍
Owner 10TH RES INST OF CETC