Dynamic satellite communication system signal tracking method and device

A satellite communication system and signal tracking technology, applied in the field of satellite communication, can solve problems such as high-order loop easy to lose lock, frequency mismatch between transmitter and receiver, carrier synchronization algorithm is difficult to function, etc., to improve bit error rate performance, solve adverse effects

Active Publication Date: 2021-01-22
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Different from traditional satellite communication systems, high-mobility terminals will generate time-varying Doppler frequency offsets with a large range and rapid changes, resulting in a frequency mismatch between the transmitter and receiver, which seriously weakens the bit error rate performance of the communication system
Traditional Doppler frequency offset estimation and tracking methods based on pilot distribution are difficult to accurately estimate rapidly changing time-varying Doppler signals
In addition, the link resources of the satellite are limited. In the environment of high dynamic and low noise ratio, the high-order loop is easy to lose the lock, and the stable tracking of the high dynamic signal cannot be completed.
At the same time, considering that the limited spectrum resources of satellites are difficult to support a large amount of pilot overhead, it is difficult for the traditional carrier synchronization algorithm based on pilot distribution to play a role
[0005] For the above problems, no effective solution has been proposed

Method used

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  • Dynamic satellite communication system signal tracking method and device
  • Dynamic satellite communication system signal tracking method and device
  • Dynamic satellite communication system signal tracking method and device

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Embodiment 1

[0032] According to an embodiment of the present invention, an embodiment of a dynamic satellite communication system signal tracking method is provided. It should be noted that the steps shown in the flow chart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0033] figure 1 It is a flow chart of a dynamic satellite communication system signal tracking method according to an embodiment of the present invention, which is applied to a mobile terminal, such as figure 1 As shown, the method includes the following steps:

[0034] Step S102, acquiring the target signal sent by the satellite, wherein the target signal is a signal obtained after preprocessing the source data, and the preprocessing includes: physical layer framing processin...

Embodiment 2

[0072] Figure 7 It is a flow chart of a dynamic satellite communication system signal tracking method according to an embodiment of the present invention, which is applied to satellites, such as Figure 7 As shown, the method includes the following steps:

[0073] Step S202, acquiring information source data;

[0074]Step S204, preprocessing the source data to obtain a target signal, wherein the preprocessing includes: physical layer framing processing, encoding processing, spreading and scrambling processing, superimposed periodic pilot processing, and symbol mapping processing , filter processing and up-conversion processing;

[0075] Step S206, sending the target signal to the mobile terminal, so that the mobile terminal can track the target signal.

[0076] In the embodiment of the present invention, the satellite uses the superimposed pilot method to directly superimpose the pilot sequence on the scrambled spread spectrum sequence, and the mobile terminal uses the pil...

Embodiment 3

[0080] The embodiment of the present invention also provides a dynamic satellite communication system signal tracking device, the dynamic satellite communication system signal tracking device is used to implement the dynamic satellite communication system signal tracking provided in the first and second embodiments of the present invention Method, the following is a specific introduction of the dynamic satellite communication system signal tracking device provided by the embodiment of the present invention.

[0081] Such as Figure 9 as shown, Figure 9 It is a schematic diagram of the above-mentioned dynamic satellite communication system signal tracking device, and the dynamic satellite communication system signal tracking device includes: a satellite 10 and a mobile terminal 20 .

[0082] The satellite 10 is used to obtain source data; preprocess the source data to obtain a target signal, wherein the preprocessing includes: physical layer framing processing, encoding proce...

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PUM

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Abstract

The invention provides a dynamic satellite communication system signal tracking method and device, and relates to the technical field of satellite communication, and the method comprises the steps: obtaining a target signal transmitted by a satellite, and enabling the target signal to be a signal obtained after the preprocessing of information source data; calculating a Doppler frequency offset value of the target signal, and compensating the target signal by using the Doppler frequency offset value to obtain a compensated target signal; calculating a code loop phase difference and a trackingfrequency change error of the compensated target signal by using a third-order tracking loop, and synchronizing the compensated target signal by using the code loop phase difference and the tracking frequency change error to obtain a synchronization signal; sequentially performing descrambling processing, de-interleaving processing and decoding processing on the synchronization signal so as to track the satellite. Therefore, the technical problem of the influence of the Doppler effect on satellite communication in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a signal tracking method and device for a dynamic satellite communication system. Background technique [0002] With the development of 6G technology, satellite communication has been introduced into the 6G communication system. Satellite communication can play an important role in 6G. One of its uses is to provide communication services to users around the world, especially those remote areas that cannot be reached by 6G infrastructure. The satellite communication system plays an important role in the 6G air-space-ground integrated communication system, which can not only enhance the reliability of 6G services, but also expand the scope of 6G services. [0003] However, most current satellite communication systems are mainly designed for low-speed terminals, and it is difficult for traditional satellite communication systems to provide reliable services for high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B1/7075H04B1/7085H04B1/709
CPCH04L27/2656H04L27/2695H04B1/70755H04B1/7085H04B1/709
Inventor 匡麟玲姜春晓王佳蔚
Owner TSINGHUA UNIV
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