摘要
将最小移频键控(MSK)信号分解成包含"空号"和"传号"两个频率两电平正交调幅(2QAM)信号,推导了MSK信号的"空号"频率和"传号"频率分别通过甚低频发射天线固定调谐系统和动态调谐系统的功率谱表达式,计算了不同码元速率情况下甚低频发射天线固定调谐系统和动态调谐系统的匹配系数和天线有效带宽。计算结果表明:动态调谐方法可改善天线的匹配性能,增加天线系统的有效带宽,从而可提高甚低频发射天线容许的通信速率。
Minimum shift keying（MSK）signal can be divided into 2QAM consisting of both space and mark signal.The expression of the space and mark signal power spectrum were derived when a MSK signal passed through a fixed tuning system and a dynamic tuning system.The antenna matching coefficient and effective bandwidth were calculated respectively for two tuning systems in the state of different symbol rates.The result indicates that the dynamic tuning system can improve the matching performance and effective antenna bandwidth significantly and thus raise the symbol rate of the MSK signal passing through the VLF transmitting antenna.
出处
《海军工程大学学报》
CAS
北大核心
2010年第5期98-102,共5页
Journal of Naval University of Engineering
关键词
天线
甚低频
调谐系统
MSK
功率谱
antenna
very low frequency
tuning system
MSK
power spectrum
