Coding control method for low-orbit constellation satellite-ground directional distribution link

Abstract

The invention discloses a coding control method for a low-orbit constellation satellite-ground directional distribution link. The coding control method is used for narrow beam directional distributionbased on a phased-array antenna, and comprises the following steps: determining antenna gain, determining spatial free propagation attenuation, determining atmospheric attenuation, determining a symbol signal-to-noise ratio of a received signal, dividing a distribution area, and determining a coding modulation mode of the distribution area. According to the coding control method for the low-orbitconstellation satellite-ground directional distribution link, the channel characteristics of the directional distribution link are fully analyzed; the quantization relation among the distribution direction, the coding gain and the channel transmission capacity is established, the distribution area is divided based on the distribution area of the information, and the corresponding coding modulation mode is determined, so that the channel transmission capacity can be remarkably improved, a feedback link does not need to be constructed, the system complexity is low, and the method is easy to implement.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to an encoding control method for low-orbit constellation satellite-ground directional distribution links. Background technique [0002] With the continuous development of aerospace technology and the vigorous rise of commercial aerospace, more and more low-orbit constellations have been put into use, such as: "Oneweb", "Starlink", "Hongyan", "Jilin No. Low-orbit constellations, low-orbit constellations are mainly used to provide users with services such as image, video, communication and navigation enhancement, and the construction of information distribution links between the space-based platform of low-orbit satellites and users is the primary guarantee for the realization of service capabilities; At present, the information distribution methods of space-based platforms to users mainly include narrow-beam directional distribution and wide-beam wide-area broadcasti...

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Problems solved by technology

In traditional satellite-to-ground communications, adaptive coding is usually used to improve spectrum utilization efficiency and channel capacity in response to changes in transmission channels; for example, see "Space Electronics Technology" magazine, No. 1, 2014, pages 20-23 The disclosed author is Yang Xinquan, and the technical literature titled "Research on Spaceborne High-speed Adaptive Transmission Technology" discloses a spaceborne adaptive transmission method. The channel status is sent back to the satellite-borne transmitter in real time, and the satellite-borne transmitter adjusts the coding and modulation methods of the transmitted signal in real time according to the channel status; although this scheme can make full use of the changes in the propagation distance of low-orbit satellites in the satellite-ground link. The channel margin increases the total amount of data transmission, but this method needs to build a feedback link to transmit the channel status back and forth, requiring both ends of the satellite and the ground to have the function of sending and receiving, which increases the complexity of the system, and the feedback link will also increase additional energy loss

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