Near-earth remote sensing satellite self-adaptive variable code modulation data transmission system and method

A technology of data transmission system and coding and modulation mode, which is applied in the field of near-earth remote sensing satellite adaptive variable coding and modulation data transmission system, can solve problems such as waste of link resources, and achieve the effect of improving efficiency

Active Publication Date: 2019-02-22
BEIJING INST OF SPACECRAFT SYST ENG
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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,

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  • Near-earth remote sensing satellite self-adaptive variable code modulation data transmission system and method
  • Near-earth remote sensing satellite self-adaptive variable code modulation data transmission system and method
  • Near-earth remote sensing satellite self-adaptive variable code modulation data transmission system and method

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Embodiment Construction

[0039] Technical solution of the present invention is: as figure 1 , within the limited data transmission time and channel bandwidth, while satisfying the transmission bit error rate requirements and link margin requirements, make full use of the change of the link margin due to the change of the satellite orbit position, by selecting Different modulation and coding methods are switched to obtain the maximum possible information throughput, and the ground system performs adaptive demodulation according to the modulation and coding protocol. In practical applications, the focus of system design is how the satellite combines its orbit and link information to select the optimal modulation and coding method, and to drive the switching between different methods through switching commands.

[0040] Considering that the variation of the system margin is mainly caused by space attenuation (determined by the distance between the satellite and the ground) and rain attenuation (determine...

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Abstract

The invention discloses a near-earth remote sensing satellite self-adaptive variable code modulation data transmission system and method, belonging to the field of satellite overall design. The invention provides a variable code modulation data transmission system and method based on a DVB-S2 protocol, which fully utilizes link resources for the near-earth remote sensing satellite data transmission, adopts a variable code modulation (VCM) system, fully utilizes the system link margin, and improves the satellite star-ground data transmission efficiency; and the optimal code modulation mode is selected by means of the DVB-S2 protocol under the condition of satisfying a bit error rate and the link margin, so that the amount of effective information transmitted per unit time is the largest. The near-earth remote sensing satellite self-adaptive variable code modulation data transmission method provided by the invention can maximize the adaptation to changing channel conditions and channel capacity due to orbital changes of the near-earth remote sensing satellite, and transmit more data information on a limited spectrum resource, which is very suitable for the data transmission of the near-earth remote sensing satellite to the ground.

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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Application Information

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IPC IPC(8): H04L1/00H04B7/185
CPCH04B7/18513H04L1/0003H04L1/0009
Inventor 张莎莎曹海翊张新伟刘希刚姚鑫雨毛一岚赵晨光元勇张雨任放邸剑锋靳凡
Owner BEIJING INST OF SPACECRAFT SYST ENG
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