Seamless switching method for master and slave satellite clocks of navigation satellite

A navigation satellite and seamless switching technology, which is applied in the design and development of spaceborne satellite clocks, can solve problems such as interruption of the use of satellite navigation signals, and achieve the effect of solving the interruption of available continuity, ensuring consistency, and ensuring continuity

Active Publication Date: 2012-07-18
BEIJING INST OF SPACECRAFT SYST ENG
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  • Application Information

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Problems solved by technology

[0005] The problem solved by the technology of the present invention is: to overcome the problem that the use of satellite navigation signals is interrupted due to the clock difference caused

Method used

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  • Seamless switching method for master and slave satellite clocks of navigation satellite
  • Seamless switching method for master and slave satellite clocks of navigation satellite
  • Seamless switching method for master and slave satellite clocks of navigation satellite

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Embodiment Construction

[0033] Such as figure 1 Shown is the flowchart of the method of the present invention. The main steps are as follows:

[0034] (1) Two sets of clock generators are set inside the satellite clock of the navigation satellite, wherein clock generator 1 and clock generator 2 take atomic clock 1 and atomic clock 2 as reference respectively, and the nominal frequencies of the output signals of the two atomic clocks are the same;

[0035] (2) Both clock generator 1 and clock generator 2 generate signals F10 and F20 respectively through direct digital frequency synthesis; the difference from traditional direct digital frequency synthesis is that a phase accumulator and a sinusoidal look-up table are added A first-level phase calibrator is used for phase synchronization between the standby clock and the master clock. The input digit of the phase calibrator is Lbit, and the full scale is the nominal period of F10 or F20, set as T F , then the resolution is:

[0036] ...

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Abstract

The invention discloses a seamless switching method for master and slave satellite clocks of a navigation satellite. The method comprises the following steps of: performing dual mixer time difference measurement on master and slave satellite clock signals, keeping values of a phase difference counter in a memory according to a certain frequency, and performing frequency difference processing, phase difference processing and second pulse synchronous processing on data in the memory in a time division mode under sequential logic control. In the frequency difference processing time period, synchronization of master and slave clock signal frequencies is finished. In the phase difference processing period, synchronization of master and slave clock signal phases is finished. In the second pulsesynchronous processing period, the second pulse initial change edge generated by the slave clock is synchronized with the second pulse initial change edge of the main clock. Both the master and slaveclocks generate satellite clock frequency signals and second pulse signals; and when the master and slave clocks are switched, the outputs of the satellite clock frequency signals and the second pulse signals are simultaneously switched. When the master and slave working clocks are switched by adopting the method, the master and slave satellite clock difference is low, the second pulse signals are continuous, and the requirement for continuous use of navigation signals is not affected during master and slave switching of the satellite clocks.

Description

technical field [0001] The invention relates to a method for switching main and standby satellite clocks, which can be used in the design and development of satellite clocks carried by satellites. Background technique [0002] The satellite navigation system can send high-precision, all-day and all-weather navigation, positioning and timing information, and is an indispensable and important space infrastructure for today's national economy and national defense construction. In the military field, the satellite navigation system is the key support to realize the precise navigation and positioning of the weapon platform and the long-range precision strike of the guided weapon. Major countries in the world attach great importance to the construction and development of satellite navigation systems. The United States and Russia have successively built global satellite navigation systems GPS and GLONASS. The European Union is currently constructing the GALILEO (Galileo) system. m...

Claims

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Application Information

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IPC IPC(8): G01S19/03
Inventor 崔小准米红刘家兴董海青李懿陈忠贵
Owner BEIJING INST OF SPACECRAFT SYST ENG
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