Method and device for timing synchronization of burst signals in satellite communication

Abstract

The invention provides a method and device for timing synchronization of burst signals in satellite communication. The method includes: performing sliding window calculation on a received burst signal to obtain a position of a maximum value in calculation results; performing position filtering on the acquired position of the maximum value to obtain a filtering position with a fraction bit; using an integer bit of the filtering position as an initial position to perform fetching on the burst signal; and using the fraction bit of the filtering position as a fraction position of an interpolation position, performing interpolation filtering on all sample value point data, and thus obtaining reconstruction data of each sample value point at an optimal sampling point. The method provided by the invention performs processing on the burst signal, including maximum value acquisition, position filtering, fetching and interpolation filtering, in the burst signal with a short unique word or without a unique word, can rapidly and accurately realize timing synchronization of a receiver and the burst signal and track a sampling frequency offset caused by instability of a timing device of a terminal and high-speed movement of the terminal, and the method provided by the invention is suitable for timing synchronization and timing tracking of receivers of various communication systems adopting a burst mode to transmit.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to a method and device for timing synchronization of burst signals in satellite communication. Background technique [0002] With the development of communication technology, TDMA (Time Division Multiple Access, Time Division Multiple Access) is also more and more widely used, such as GSM (Global System for Mobile Communication, Global System for Mobile Communication) in the second generation cellular system and Multiple access technology used in IS-136 (or D-AMPS or ADC) standard. [0003] Specifically, the TDMA burst communication system has two characteristics: first, the signal transmission adopts a burst structure (wherein, the burst structure is a message format in a time slot on a TDMA channel), and the network allocates different The above two characteristics of the TDMA burst communication system make it discontinuous for the user terminal to receive signals. In ord...

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Problems solved by technology

[0004] In practice, for the satellite mobile communication system using the TDMA burst communication mode, there are two problems: on the one hand, because the timing device (such as crystal oscillator) of the terminal itself is not completely unified with the timing device sent by the network side, this will cause the terminal There is a sampling phase deviation when sampling the received signal, and the best sample point cannot be collected; on the other hand, due to the instability of the timing device of the terminal itself, when the terminal is in high-speed motion (such as an aviation terminal), it will lead to the occurrence of sampling frequency deviation

[0006] The inventor found in the research that for the GMR-1 (GEO-Mobile Radio, near-geostationary orbit mobile wireless communication) system, there are bursts with very short unique words (such as NT3 bursts) and even bursts in the burst types. Bursts without unique words (such as DKAB bursts), which makes the traditional timing synchronization method using unique word correlation no longer applicable

Moreover, due to the characteristics of slow tracking speed and continuous signal reception in ordinary timing tracking loops, ordinary timing tracking loops are not suitable for TDMA systems with burst structures.

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