Time slot synchronous system and method of GEO satellite mobile communication based on 3G under high dynamic environment

A technology of satellite mobile communication and high dynamic environment, applied in transmission systems, radio transmission systems, electrical components, etc., can solve the problem that the algorithm is difficult to directly apply satellite mobile communication, etc., to achieve high speed, high precision and save hardware resources. Effect

Active Publication Date: 2010-11-17
SPACE STAR TECH CO LTD
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Problems solved by technology

Therefore, it is difficult to directly apply these algorithms

Method used

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  • Time slot synchronous system and method of GEO satellite mobile communication based on 3G under high dynamic environment
  • Time slot synchronous system and method of GEO satellite mobile communication based on 3G under high dynamic environment
  • Time slot synchronous system and method of GEO satellite mobile communication based on 3G under high dynamic environment

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Embodiment Construction

[0050] Specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0051] Such as Figure 5 Shown is a detailed block diagram of the present invention. The antenna and the preamplifier and downconverter in the radio frequency circuit module are connected in series to receive the downlink signal of the satellite, and then sent to the A / D conversion module for sampling processing; The orthogonal carrier is multiplied in the quadrature down-conversion module to complete the quadrature down-conversion process, that is, the correlation demodulation, and then sent to the low-pass filter module. The low-pass filter module adopts the structure of two low-pass filters when it is realized. Perform low-pass filtering on the quadrature and in-phase signals respectively; the generated two baseband signals are respectively sent to the carrier tracking module and two matched filter modules; the two matched filter m...

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Abstract

The invention relates to time slot synchronous system and method of GEO (geographic) satellite mobile communication based on 3G under a high dynamic environment. The time slot synchronous system comprises an antenna, a radio frequency circuit module, an A/D (Analogue to Digital) conversion module, an orthogonal down-conversion module, a low pass filter module and a numerical controlled oscillator module. The time slot synchronous system is characterized by comprising a matched filtering module, an FFT (Fast Fourier Transform) module and a carrier tracking module, wherein the key folded matched filtering module in the matched filtering module is designed based on equal capture velocity to save the hardware resources greatly. The FFT module and the carrier tracking module are combined so that the capture velocity to the carrier frequency is greater and more accurate. At the same time, by adopting the invention, time slot synchronization to a GEO satellite down-link channel can be realized under the high dynamic environment that Doppler frequency shift is 40KHz.

Description

technical field [0001] The invention relates to satellite mobile communication time slot synchronization technology, in particular to a 3G-based GEO satellite mobile communication time slot synchronization system and method in a high dynamic environment. Background technique [0002] The satellite mobile communication system refers to a communication system that uses satellites to provide mobile communication services. Its typical feature is to use satellites as relay stations to provide mobile services to users. [0003] Satellite mobile communication based on the third generation mobile communication system (3G) adopts CDMA spread spectrum mode. When the Doppler frequency shift reaches 40kHz, the mobile communication system works in a high dynamic environment. The carrier of the signal received by the terminal in a highly dynamic environment has a large Doppler frequency shift, and the Doppler frequency shift can be as high as tens of kilohertz when the aircraft flies at ...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B7/185
Inventor 徐峰邹光南
Owner SPACE STAR TECH CO LTD
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