甚低频接收机的开发与应用Development and application of VLF receiver
刘卿,顾旭东,倪彬彬
摘要(Abstract)：
甚低频(VLF)信号被广泛应用于地球空间环境地基监测、全球航海通信与导航等领域。该系统在传统甚低频接收天线的基础上,进行了天线小型化的改进,通过阻抗匹配,改善了系统灵敏度。该系统包括磁环天线,低噪声模拟前端,数据采集与传输模块以及同步模块。磁环天线采用罗德施瓦茨公司生产的HZ-10型磁环天线。模拟前端分为基于差分结构的低噪放大器和巴特沃斯滤波器两部分,在带宽1~50 kHz内增益高达80 d B。数据采集和传输模块采用基于FPGA和USB 2.0总线的方法。在武汉(30.54°N,114.37°E)测得宽带甚低频波谱结果初步验证了该地基甚低频接收系统的有效性和可行性。对人工甚低频MSK调制信号进行幅度解调处理,得到其幅值的日变化曲线图。
关键词(KeyWords)： 空间探测;磁环天线;甚低频接收机;阻抗匹配;数据处理;幅值日变化
基金项目(Foundation): 武汉大学电子信息学院“985工程”学科建设项目(2042014kf0251);; 国家自然科学基金资助项目(41204120);国家自然科学基金资助项目(41304127)~~
作者(Author): 刘卿,顾旭东,倪彬彬
DOI: 10.16652/j.issn.1004-373x.2018.14.001
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