面向臨近空間的直擴信號快速同步技術(shù)研究
[Abstract]:Spread spectrum technology has been widely used in aerospace and other related communication fields, among which the synchronization technology of spread spectrum signals is the key of spread spectrum communication system. The synchronization of spread spectrum signals mainly includes two processing processes: acquisition and tracking. In the measurement and control communication in the adjacent space, because of the high moving speed of the carrier, the received signal has a very large Doppler frequency offset, so the acquisition of the spread spectrum signal must complete the acquisition of the carrier and its pseudo-code phase at the same time. The multipath effect and low signal-to-noise ratio (SNR) caused by low elevation environment also greatly increase the difficulty of acquisition and tracking. In this paper, the synchronization technology of burst transmission and spread spectrum communication in the near space environment is studied. Firstly, the principle and characteristics of the direct spread spectrum system are briefly introduced. At the same time, the principle of pseudorandom sequence in spread spectrum communication is discussed. Then, the fast acquisition algorithm based on FFT and the phase-locked tracking loop are studied and analyzed in high dynamic environment. Finally, the acquisition and tracking module of burst transmission system is designed. On the premise of determining the transmission frame structure, the performance and complexity of several fast acquisition algorithms discussed before are analyzed, and the appropriate algorithm and corresponding parameters are selected. The reliable transmission with high dynamic and low signal-to-noise ratio is realized, and the simulation of the designed synchronization module in different channel environment is carried out.
【學位授予單位】:西安電子科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TN914.42
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