| 黄晓砥,宫在晓.多普勒频移环境中水声通信伪随机码快速捕获方法[J].,2004,23(6):24-30 |
| 多普勒频移环境中水声通信伪随机码快速捕获方法 |
| A new PN code acquisition algorithm for underwater communication in high doppler environment |
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| 中文摘要: |
| 伪随机码应用于水声通信时,需解决接收信号在多普勒频移情况下的快速捕获问题。本文在全数字通讯系统的框架内,提出了基带信号相关检测的数字下移频算法,显著减小了计算量,并针对数字处理的灵活性,提出了多普勒频移的概率搜索策略,根据多普勒频移的分布概率来对其进行搜索,进一步减小多普勒频移搜索的计算量。 |
| 英文摘要: |
| It is inevitable that the spread spectrum system of underwater communication will face the difficulty of the PN code acquisition in high Doppler environment. A new approach, which can be used in Software Defined Radio, can reduce the amount of calculation. This approach consists of two parts. One is a new type of DDC (Digital Down Converter) which shifts the signal in the frequency domain and cuts short the length in frequency domain. The other is a probability strategy to reduce the amount of the Doppler shifts searching. |
| DOI：10.11684/j.issn.1000-310X.2004.06.006 |
| 中文关键词: 水声通信 多普勒频移 PN码 搜索策略 |
| 英文关键词: derwater communication Doppler shift PN code Search strategy |
| 基金项目:中国科学院声学研究所所长择优基金资助项目(S2004-08) |
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