Volume 40 Issue 3
May  2020
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CHEN Tingting, LIN Baojun, GONG Wenbin, CHANG Jiachao. Time Recovery Strategy of Navigation Satellite Based on Inter-satellite Link[J]. Journal of Space Science, 2020, 40(3): 419-424. doi: 10.11728/cjss2020.03.419
Citation: CHEN Tingting, LIN Baojun, GONG Wenbin, CHANG Jiachao. Time Recovery Strategy of Navigation Satellite Based on Inter-satellite Link[J]. Journal of Space Science, 2020, 40(3): 419-424. doi: 10.11728/cjss2020.03.419

Time Recovery Strategy of Navigation Satellite Based on Inter-satellite Link

doi: 10.11728/cjss2020.03.419
  • Received Date: 2019-04-11
  • Rev Recd Date: 2019-10-22
  • Publish Date: 2020-05-15
  • When the Beidou navigation satellite is on autonomous navigation, the satellite time-frequency system abnormality will cause the load time system to power off and restart, which is an intrackable problem. For this reason, a new strategy is proposed using ranging and data transmission functions of the Beidou inter-satellite link. Due to the stability and accuracy of the current on-board computer crystal oscillator, the method of using ten-second stability for predicting crystal frequency drift to calculate satellite time instead of the crystal oscillator is proposed to make sure the satellite clock is stable during the restart time of the load system. With this method, total error can satisfy the allowable range of inter-satellite link construction error. After the load system is restarted, the on-board computer gives the navigation task processor a standard time and total error is calculated through error analysis system, which can also meet inter-satellite link standard. The satellite clock error can be fixed through the inter-satellite link to re-synchronize the satellite time and ground time.

     

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