Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for testing phase and frequency change before and after switching primary and secondary clocks of navigation satellite

A navigation satellite and frequency change technology, which is applied in the field of time-frequency performance testing of satellite clocks, can solve the problems of frequency change errors, very high frequency jump accuracy requirements, and failure to meet test needs, etc., to eliminate measurement value jitter and suppress measurement noise effect

Active Publication Date: 2013-12-04
BEIJING INST OF SPACECRAFT SYST ENG
View PDF3 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for testing phase and frequency change before and after switching primary and secondary clocks of navigation satellite
  • Method for testing phase and frequency change before and after switching primary and secondary clocks of navigation satellite
  • Method for testing phase and frequency change before and after switching primary and secondary clocks of navigation satellite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] Such as 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 ;...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

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 ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com