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A Timing Synchronization Method for General Satellite High-Speed ​​Data Transmission Signals

A signal timing, high-speed technology, applied in the field of satellite communications, can solve the problems of complex synchronization methods and lack of versatility, and achieve the effects of shortening the loop capture time, increasing the flexibility of use, and reducing timing jitter

Inactive Publication Date: 2018-09-25
INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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Problems solved by technology

[0008] The synchronization control method disclosed in this patent document adopts the method of combining auxiliary ranging and self-ranging, which can realize the rapid initial acquisition timing of the system. However, the ranging timing error value needs to be continuously adjusted, and various types of satellite communication service stations need to According to the timing error information, the transmission timing value of the station is constantly adjusted. The realization of the synchronization method is quite complicated, and it is limited to a specific signal modulation system, which lacks versatility

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  • A Timing Synchronization Method for General Satellite High-Speed ​​Data Transmission Signals
  • A Timing Synchronization Method for General Satellite High-Speed ​​Data Transmission Signals
  • A Timing Synchronization Method for General Satellite High-Speed ​​Data Transmission Signals

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[0044] see figure 1 and figure 2 , a general satellite high-speed data transmission signal timing synchronization method, comprising the following steps:

[0045] a. High-speed sampling: Band-pass sampling is performed on the intermediate frequency input signal r(t) using formula 1:

[0046] fs=4×D×Rs (Formula 1);

[0047] Among them, fs is the sampling rate, D is the extraction multiple, Rs is the symbol rate, sampling according to the band-pass sampling theorem, to ensure that the sampled signal spectrum does not alias;

[0048] b. Signal demodulation: perform digital down-conversion and multi-stage filter extraction on the intermediate frequency sampling signal r(mTs), move the signal spectrum to the baseband, and at the same time reduce the sampling rate by D times to 4 times the symbol rate, and use formula 2 to obtain fs ', output baseband signals I(nTs') and Q(nTs');

[0049] fs'=4×Rs (formula 2);

[0050] Among them, fs' is the sampling rate after extraction, and...

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Abstract

The invention discloses a universal satellite high-speed data transmission signal timing synchronization method, belonging to the technical field of satellite communications. The method comprises following steps of high-speed sampling, signal demodulation, timing error estimation, timing extraction, loop filtering, timing correlation and gating, sampling frequency controlling and sampling frequency synthesization. Due to adoption of an envelope square timing error estimation algorithm and effective A / D sampling frequency controlling, a closed loop timing synchronization loop is formed finally. According to the method, synchronization is simple, timing synchronization of multiple modulation systems like MPSK, MQAM, MAPSK and so on can be realized, so that the method has good universality and greatly improves the use flexibility.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a timing synchronization method for general satellite high-speed digital transmission signals based on closed-loop sampling frequency control. Background technique [0002] In recent years, with the rapid development of applications such as remote sensing satellites, data relay satellites, and military reconnaissance satellites, massive data files have been formed on satellites, which need to be transmitted to the ground for reception through downlink high-speed data transmission links. At present, satellite high-speed digital transmission signals mainly adopt high-order modulation systems to save signal bandwidth, mainly including multi-phase shift keying MPSK, multi-quadrature amplitude modulation MQAM, multi-amplitude phase keying MAPSK and other modulation methods, and the transmission code rate has reached Hundreds of Mbps, even more than Gbps. For ground re...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/185
CPCH04B7/18578H04B7/18589
Inventor 陈大海杨大龙邝文金数波张莉莉
Owner INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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