Near-Earth Remote Sensing Satellite Adaptive Variable Coding Modulation Data Transmission System and Method

Abstract

The invention relates to a near-earth remote sensing satellite adaptive variable coding modulation data transmission system and method, belonging to the field of overall satellite design. The present invention provides a variable coding modulation data transmission system and method based on the DVB-S2 protocol, which fully utilizes the link resources of near-earth remote sensing satellite data transmission, adopts a variable coding modulation (VCM) system, and fully utilizes the system link Margin to improve satellite-to-ground data transmission efficiency; use DVB‑S2 protocol to select the optimal coding and modulation method under the condition of satisfying bit error rate and link margin, so as to maximize the amount of effective information transmitted per unit time . The method proposed by the present invention can adapt to the maximum extent to the constantly changing channel conditions and channel capacity brought about by the orbital change of near-earth remote sensing satellites, transmit more data information on limited spectrum resources, and is very suitable for near-earth remote sensing satellites. Remote sensing satellite to ground data transmission.

Description

technical field [0001] The invention relates to a near-earth remote sensing satellite adaptive variable coding modulation data transmission system and method, and belongs to the field of overall satellite design. Background technique [0002] In recent years, with the development of remote sensing technology in China, the technological leaps and space applications of various types of payloads have laid a foundation for the realization of remote sensing satellite earth observation tasks. In high-resolution earth observation missions, satellite payloads will generate massive observation data, which need to be transmitted back to the ground station through the satellite-ground data transmission link. Most of the low-orbit remote sensing satellites that perform earth observation missions adopt sun-synchronous orbits, usually only about 15 laps per day, and the transit time of each lap is also very short, only about 7-10 minutes, which determines that they can be used for The ti...

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Problems solved by technology

Therefore, although the CCM transmission system is simple to implement, when the channel condition changes from bad to good, data transmission is still carried out according to the worst channel condition, which greatly wastes precious link resources.

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