Design and implementation of variable coding and modulation for LEO high‐resolution Earth observation satellite

Summary As LEO (Low Earth Orbit) high‐resolution Earth observation satellite needs to transmit a large amount of remote sensing data from the satellite to the ground station, higher downlink capacity still poses a severe challenge to LEO. Therefore, variable coding and modulation (VCM) has become an...

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Bibliographic Details
Published in:International journal of satellite communications and networking Vol. 41; no. 4; pp. 303 - 314
Main Authors: Li, Li, Zheng, Xiaosong, He, Mingyi, Jin, Fan, Xie, Tianjiao, Cao, Haiyi
Format: Journal Article
Language:English
Published: Chichester Wiley Subscription Services, Inc 01.07.2023
Subjects:
Coding
Downlinking
Earth observations (from space)
FPGA
Gaofen‐7 satellite
Ground stations
LDPC codes
Low earth orbits
MAPSK modulator
Modulation
Remote observing
Remote sensing
Satellite observation
variable coding and modulation
ISSN:1542-0973, 1542-0981
Online Access:Get full text
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Summary:Summary As LEO (Low Earth Orbit) high‐resolution Earth observation satellite needs to transmit a large amount of remote sensing data from the satellite to the ground station, higher downlink capacity still poses a severe challenge to LEO. Therefore, variable coding and modulation (VCM) has become an important scheme to optimize the performance of satellite downlink. In this paper, the downlink VCM system of China Earth observation satellite is studied for the first time. By evaluating the free space loss of the satellite downlink path, a VCM‐based satellite downlink system is designed, and a DVB‐S2 BCH‐LDPC encoded variable bit rate high‐order MAPSK modulator is implemented. The maximum channel bit rate can reach 3.5 Gbps. Then, the experimental results of Gaofen‐7 satellite, which was launched in November 2019, are carried out which showed that our design method effectively meets the design requirements, and the performance is verified. In this paper, the downlink VCM system of China Earth observation satellite is studied for the first time. By evaluating the free space loss of the satellite downlink path, a VCM‐based satellite downlink system is designed, and a DVB‐S2 BCH‐LDPC encoded variable bit rate high‐order MAPSK modulator is implemented. The maximum channel bit rate can reach 3.5 Gbps. Then, the experimental results of Gaofen‐7 satellite, which was launched in November 2019, are carried out, which shown that our design method effectively meets the design requirements, and the performance is verified.
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ISSN:1542-0973
1542-0981
DOI:10.1002/sat.1465