Abstract

A four-channel parallel acquisition scheme combining partial matched filters and fast Fourier transforms (PMF-FFT) is proposed for the fast acquisition of the spread spectrum signals in satellite communication terminals installed into the offshore buoys with the high-dynamic movement, which is used tofinish data communication missions between the buoys and the satellite. Compared with traditional code phase FFT scheme, the new scheme reduces the maximum acquisition time to 26.5% and the maximum computation amount to 46.9%. It also improves about 4 times in the frequency resolution and 1.6 dB in the receiving sensitivity at the expense of computation complexity compared to PMF-FFT scheme. The parallel PMF-FFT scheme greatly reduces scallop loss, thus ensuring acquisition sensitivity. The parallel PMF-FFT scheme within the satellite communication terminal can ensure the fast and stable tracking of satellite signal by the violently moving antenna within 20 ms under level-4 sea state.

中文翻译：

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卫星通信扩频信号的快速捕获方案

摘要

提出了一种结合部分匹配滤波器和快速傅立叶变换（PMF-FFT）的四通道并行捕获方案，用于以高动态运动快速捕获安装在离岸浮标中的卫星通信终端中的扩频信号。完成浮标和卫星之间的数据通信任务。与传统的码相位FFT方案相比，新方案将最大采集时间减少到26.5％，将最大计算量减少到46.9％。与PMF-FFT方案相比，它的频率分辨率提高了约4倍，接收灵敏度提高了1.6 dB，但是却以计算复杂性为代价。并行PMF-FFT方案大大降低了扇贝损失，从而确保了采集灵敏度。