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    • THREE-CHANNEL DIGITAL RADIO VECTOR FIELD SENSOR: DESCRIPTION AND DEMONSTRATION

    Roger Karlssony,Walter Puccio,Jan Bergman,Tobia D. Carozzi,Bo Thide

    msra（2004）

    Swedish Institute of Space Physics

    Cited 23|Views2
    Abstract
    This paper presents a three-channel digital Radio Vector Field Sensor (RVFS), which imple- ments digital quadrature down-conversion. Either the electric vector wave field is measured with three orthogonal dipole antennas or the magnetic vector wave field with three orthogonal loop antennas. Three identical parallel channels with anti-aliasing filters limit the input fre- quency band to between 0 and 10 MHz and 14 bits Analogue-to-Digital Converters samples the three signals at 25 Msamp/s. By increasing the cut-off frequency of the anti-aliasing filters, the sampling frequency can be increased up to 50 Msamp/s. Digital quadrature mixers reduce the amount of data and output baseband I and Q with 16 bits resolution. The data is streamed up to 10 Mbit/s to the user over a local area network and the user commands the RVFS with a graphical user interface running on a Linux computer connected to the internet. The RVFS is an implementation of the Information Dense Antenna and since this RVFS mea- sures the full three-dimensional wave field, applications such as polarisation measurements and direction-finding are possible. The RVFS can also function as a radio receiver of long-, medium-, and shortwave radio stations. An important and interesting application is as receiver for LOIS, the LOFAR Outrigger In Scandinavia. Space-borne applications involves electric and magnetic field instruments on board the International Space Station, electric and/or mag- netic field instruments on board the Swedish nano satellite Nanospace-1. International projects like the Solar Imaging Radio Array have also shown interest.
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    【要点】：本文介绍了一种三通道数字无线电矢量场传感器（RVFS），通过数字正交下变频技术实现电场或磁场三维波场的测量，具有在极化测量和方向寻找等应用中的潜力。
    

    【方法】：采用三个正交偶极子天线或三个正交环形天线分别测量电场或磁场，通过三个并行通道中的抗混叠滤波器限制输入频率在0至10 MHz之间，并使用14位模数转换器以25 Msamp/s的速率采样信号，数字正交混频器降低数据量并输出16位分辨率的基带I和Q信号。
    

    【实验】：实验中，数据以10 Mbit/s的速率通过局域网传输至用户，用户通过运行在连接互联网的Linux计算机上的图形用户界面控制RVFS。该传感器可用于接收长、中、短波无线电信号，并已在国际空间站和瑞典纳米卫星Nanospace-1上的电场和磁场仪器中有所应用，同时得到了国际项目如Solar Imaging Radio Array的关注。数据集名称未在文本中提及。