VLF Receiver

GO-ABOVE (Geospace Observatory - Array for
Broadband Observations of VLF/ELF Emissions) is a set of ground-based VLF receivers operating from 100 Hz to 75 kHz. The ABOVE instruments monitor electromagnetic covering chorus and hiss emissions as well as U.S. Navy transmitters near 25 kHz. The
absolute timing accuracy is 10 ns, from GPS.

The instrument utilizes two VLF antennas, one aligned North-South, the other East-West.

GO-ABOVE（地球空间观测阵列——用于宽带观测甚低频/极低频辐射）是一套地面甚低频接收器，工作频率范围为100赫兹至75千赫兹。ABOVE仪器监测电磁覆盖的合唱声和嘶嘶声发射，以及位于25千赫兹附近的美国海军发射器。绝对时间精度为10纳秒，由全球定位系统提供。该仪器采用两个甚低频天线，一个南北方向对齐，另一个东西方向对齐。