Chinese Space Science and Technology ›› 2020, Vol. 40 ›› Issue (5): 18-25.doi: 10.16708/j.cnki.1000-758X.2020.0054

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Research on the application efficiency of variable coding modulation in remote sensing satellite

ZHANG Shasha,CAO Haiyi,ZHANG Xinwei,YAO Xingyu,ZHENG Xiaosong,ZHANG Yu   

  1. 1.Institute of Remote Sensing Satellite, China Academy of Space Technology, Beijing100094, China
    2.Xi′an Academy of Space Electronic Information Technology, Xi′an710071, China
  • Online:2020-10-25 Published:2020-09-30

Abstract: With the increasing amount of LEO remote sensing satellite observation data,the ability of data transmission has become a  factor to restrict the efficiency of satellite. Variable coding modulation (VCM) can be used to make full use of the system link margin, based on the dynamic evaluation of the satellite-ground data transmission channel conditions. And on the premise of ensuring the bit error rate and link margin, the optimal coding and modulation mode switching under the current channel conditions are carried out adaptively, so as to improve the satellite data transmission efficiency. Using this method, the efficiency of log link was simulated and analyzed. Compared with the constant coding modulation (CCM) with the same symbol rate, the transmission efficiency was increased by 42.1% on average, which can provide a reference for the design of data transmission channel of remote sending satellite.

Key words: remote sensing satellites, data transmission, variable coding modulation, link margin, efficiency