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Low-orbit satellite low-signal-to-noise-ratio high-dynamic burst signal carrier synchronization method

A low signal-to-noise ratio, burst signal technology, applied in the direction of radio transmission systems, electrical components, transmission systems, etc., can solve the problems of reduced transmission frame efficiency and increased time delay, and achieve moderate computational complexity, improved accuracy, and improved Effect of Frequency Estimation Accuracy

Inactive Publication Date: 2020-09-22
中国星网网络应用有限公司
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Problems solved by technology

However, under the condition of high dynamics and low signal-to-noise ratio of low-orbit satellites, it is difficult for the phase-locked loop to achieve fast synchronization in a short period of time, and a large number of carrier synchronization symbols need to be added to the burst frame header, resulting in a decrease in transmission frame efficiency and an increase in delay

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  • Low-orbit satellite low-signal-to-noise-ratio high-dynamic burst signal carrier synchronization method
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  • Low-orbit satellite low-signal-to-noise-ratio high-dynamic burst signal carrier synchronization method

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[0038] Embodiments of the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and therefore are only examples, rather than limiting the protection scope of the present invention.

[0039] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application shall have the usual meanings understood by those skilled in the art to which the present invention belongs.

[0040]Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodimen...

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Abstract

The invention relates to the technical field of space-air-ground-sea integrated communication, in particular to a low-orbit satellite low-signal-to-noise-ratio high-dynamic burst signal carrier synchronization method. According to the method, burst signal Doppler frequency offset, Doppler frequency offset change rate and carrier phase parameter estimation and correction are realized step by step by adopting a forward structure. The parameter estimation precision of Doppler frequency offset and frequency offset change rate is improved by combining FFT with a quadratic inner difference algorithm; and the phase parameter estimation value of the outburst signal is obtained by using a linear interpolation mode, the estimation precision can obtain higher carrier synchronization under the conditions of high dynamic and low signal-to-noise ratio of a low-orbit satellite, the operation complexity is moderate, and the requirement of engineering application can be met.

Description

technical field [0001] The invention relates to the technical field of air-space-ground-sea integrated communication, in particular to a carrier synchronization method for a low-SNR high-dynamic burst signal of a low-orbit satellite. Background technique [0002] Seizing the commanding heights of aerospace information competition and developing related emerging industries has become another strategic opportunity for developed countries. Our country's economy, politics and military are in the period closest to the center of the world stage in a complex international environment. [0003] As an important part of the space-space-ground-sea integrated information network, low-orbit satellite communication has the advantages of wide coverage and flexible access. However, in low-orbit satellite communication, the low-orbit satellite has a very high speed relative to the ground terminal, and there will be a considerable Doppler frequency shift between the received signal frequency...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185
CPCH04B7/1851H04B7/18519H04B7/18582
Inventor 谷林海
Owner 中国星网网络应用有限公司
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