Method for testing phase and frequency change before and after switching primary and secondary clocks of navigation satellite
A technology of navigation satellites, master and backup clocks, applied in the field of time-frequency performance testing of satellite clocks, can solve problems such as frequency variation error, frequency hopping accuracy requirements are very high, and cannot meet the test needs, etc., to eliminate measurement value jitter, suppress Measuring the effect of noise
Active Publication Date: 2015-04-22
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology
Because both the main clock and the backup clock of the satellite clock have frequency drift, and the navigation system has very high requirements on the frequency jump accuracy before and after the switch of the satellite clock master and backup clock, and the drift rate within the measurement time is enough to affect the measurement results, resulting in There may be a large error between the change of the mean value and the frequency change before and after frequency switching
Therefore, the traditional time-frequency measurement method can no longer meet the current satellite research and development needs for testing the phase and frequency changes before and after switching the main and standby clocks of navigation satellites.
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[0021] like figure 1 Shown is the flowchart of the method of the present invention. The main steps are as follows:
[0022] (1) Use a high-precision atomic frequency standard as the frequency reference of the phase test equipment, such as the active hydrogen atomic clock SOHM-4, MHM2010 (product of Symmetricom), etc., and use the phase measurement equipment to output the satellite clock (main clock or backup clock) The phase measurement of the signal is carried out, and the phase measurement equipment usually adopts the short-term stability tester Picotime of Stanford Company. It is required that the frequency accuracy of the high-precision atomic frequency standard is an order of magnitude higher than that of the satellite clock, and the frequency stability of the high-precision atomic frequency standard is more than three times better than that of the satellite clock. The phase measurement data acquisition equipment collects the phase measurement value once per second ;
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Disclosed is a method for testing phase and frequency change before and after switching primary and secondary clocks of a navigation satellite. Phases of output signals of satellite clocks are measured by a phase measuring device, phase measuring data are acquired at equal time intervals, phase measuring data before and after output of on-off switching action of the satellite clocks are recorded for a long time, on-off switching time is recorded, phase testing data before and after switching are respectively subjected to curve-fitting by the least square method, and change quantities of the phases and frequency are calculated according to fitted values corresponding to the switching time before and after switching. By the method, the influence of frequency drift of the satellite clocks and measuring instruments on testing results can be reduced, and measuring precision is high.
Description
technical field [0001] The invention relates to a method for testing the time-frequency performance of a satellite clock carried on a navigation satellite. 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. At present, our country has completed the ...
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IPC IPC(8): G01S19/23
Inventor 崔小准王璐毕少筠米红李懿刘崇华刘天雄
Owner BEIJING INST OF SPACECRAFT SYST ENG