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Adaptive modulation and coding method specific to remote sensing data transmission of low earth orbit satellite

An adaptive modulation, modulation and coding technology, applied in the direction of adjusting channel coding, digital transmission system, transmission system, etc., can solve the problems of antenna beam width, multi-path interference channel time-varying, not suitable for small mobile terminals, etc., to achieve stability Measure, simplify the effectiveness of your system

Active Publication Date: 2017-08-15
PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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Problems solved by technology

However, for the small mobile receiving end of the low-orbit remote sensing satellite, due to the wide antenna beam, it will introduce multipath interference and channel time-varying characteristics
Therefore, the existing remote sensing satellite data transmission ACM method is only suitable for ground fixed stations equipped with large-diameter antennas, and is not suitable for small mobile terminals.
[0008] In addition, since the data transmission payload of the low-orbit remote sensing satellite currently used only has the launch function, it is necessary to add a special SINR measurement station to realize the change of the modulation and coding method of the low-orbit remote sensing satellite through the remote control channel

Method used

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  • Adaptive modulation and coding method specific to remote sensing data transmission of low earth orbit satellite
  • Adaptive modulation and coding method specific to remote sensing data transmission of low earth orbit satellite
  • Adaptive modulation and coding method specific to remote sensing data transmission of low earth orbit satellite

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Embodiment Construction

[0045] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0046] The invention provides an adaptive modulation and encoding method for low-orbit satellite remote sensing data transmission.

[0047] The main idea is to:

[0048] Such as figure 2 As shown, the present invention solves the problem of low-orbit satellite remote sensing data transmission channel frequency selective fading and channel time variation by estimating and smoothing the SINR, and realizes the stable measurement of the channel state; and utilizes the predictability of the channel to perform SINR Prediction, to solve the problem of SINR estimated value expiration caused by the large delay of satellite-to-ground transmission. On the other hand, instead of setting up a special SINR measurement station, it is done jointly by the ground receiving end and the remote sensing satellite to simplify the system.

[0049] The specific steps are:

[...

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Abstract

The invention discloses an adaptive modulation and coding method specific to remote sensing data transmission of a low earth orbit satellite. On one hand, through estimation and smoothing of an SINR (Signal to Interference plus Noise Ratio), the problems of frequency selective fading and channel time varying in a remote sensing data transmission channel of the low earth orbit satellite are solved, and stable measurement of a channel state is realized; and the SINR is predicted by means of the predictability of the channel, so that the problem of expiration of an SINR estimated value due to large time delay in satellite-ground transmission is relieved. On the other hand, data transmission equipment of a remote sensing satellite has receiving and transmitting functions, so that an SINR measurement station does not need to be built, and SINR measurement can be finished directly by a ground receiving end through the prior art, thereby simplifying a system.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an adaptive modulation and encoding method for low-orbit satellite remote sensing data transmission. Background technique [0002] Adaptive modulation and coding makes the modulation and coding efficiency increase with the improvement of channel conditions. It has been maturely applied in satellite communication and ground mobile communication, and can be used for reference in the transmission of low-orbit satellite remote sensing data, so that the transmission rate increases with the elevation angle. And the corresponding increase, so as to make full use of the link power margin in the high elevation angle area in the low-orbit remote sensing satellite transit window. [0003] At present, the adaptive modulation and coding method for remote sensing satellite data transmission (Zhang Jiapeng, Huang Puming, Chen Hong. Analysis and Simulation of Remote Sensing Satellite Adapti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/336H04L25/02H04L1/00
CPCH04B17/336H04L1/0003H04L1/0009H04L25/0224H04B7/18513H04B7/18543
Inventor 丁丹赵阳王朋云廖育荣柴黎李云涛倪淑燕杨君姜明勇
Owner PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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