A time-frequency transfer method between ground stations suitable for pseudolite augmentation system
A technology for enhancing systems and pseudolites, applied in the field of time-frequency transfer between ground stations, which can solve the problems of satellite dependence and low time synchronization accuracy, and achieve the effect of enhancing performance
Active Publication Date: 2021-10-29
中国人民解放军61081部队 +9
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[0007] The embodiment of the present invention aims at the problem that the time synchronization accuracy of the existing ground stations is not high and relies heavily on satellites, and proposes a time-frequency transfer method between ground stations suitable for pseudolite enhancement systems, using long-distance and large-capacity optical fiber communication and optical The network adopts the inter-station time comparison method based on optical fiber time transfer to perform time synchronization between ground stations, which effectively improves the time synchronization accuracy and navigation performance, and is especially suitable for time-frequency transfer in long-distance or complex urban environments
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[0041] This embodiment provides a time-frequency transfer method between ground stations suitable for a pseudolite augmentation system. figure 1 Shown is a schematic flow chart of the time-frequency transfer method between ground stations. Such as figure 1 As shown, the method for time-frequency transmission between ground stations uses optical fiber for time-frequency transmission, specifically, including the following steps:
[0042] Step S1, realizing time-frequency synchronization between the master station and the slave station through single-point-to-single-point optical fiber;
[0043] In step S2, the time-frequency synchronization between the slave station and the slave station is realized in a single-point-to-multipoint manner.
[0044] The pseudolite augmentation system includes a time-frequency reference station, a master station, at least one slave station, and at least one substation.
[0045] figure 2 Shown is the schematic diagram of the time-frequency sync...
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The embodiment of the present invention provides a time-frequency transfer method between ground stations suitable for pseudolite augmentation system, which is used to solve the problem of low time synchronization accuracy between ground stations and the strong dependence of high-precision time-frequency transfer on satellites in the prior art . The time-frequency transmission method between ground stations of the pseudolite enhancement system uses optical fiber for time-frequency transmission, and first realizes time-frequency synchronization between the master station and the slave station through a single-point-to-single-point optical fiber mode, and the master station receives the time-frequency reference station signal as To transfer the reference, the master station and the slave station optical fibers establish six fiber channels for wavelength division multiplexing to realize the round-trip transmission of time-frequency signals and data information, and then realize the time-frequency synchronization between the slave station and the sub-station through single-point to multi-point mode. The present invention utilizes long-distance and large-capacity optical fiber communication and optical network, adopts inter-station time comparison based on optical fiber time transfer, performs time synchronization between ground stations, effectively improves time synchronization accuracy, improves navigation performance, and is especially suitable for long-distance or complex urban areas environment for time synchronization.
Description
technical field [0001] The invention belongs to the field of radio navigation and positioning, and in particular relates to a time-frequency transmission method between ground stations suitable for a pseudolite augmentation system. Background technique [0002] A pseudolite is a navigation signal generator arranged on the ground, usually combined with the Global Positioning System (GPS) or Beidou satellite navigation system, etc., to enhance navigation performance and positioning accuracy through ground-based pseudolite. In the satellite navigation system, the time synchronization accuracy between stations is one of the bottlenecks restricting the performance of the system; similarly, in the ground-based pseudolite augmentation system, the time synchronization accuracy between the ground stations is also one of the key parameters restricting the navigation performance of the ground system . [0003] At present, high-precision inter-station time synchronization is mainly rea...
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IPC IPC(8): H04J3/06H04B10/25
CPCH04J3/0638
Inventor 周建华赵金贤刘勇张之学汤廷松焦诚张锋王兵浩王茂磊
Owner 中国人民解放军61081部队