Low Frequency Radio Spectrometer onboard the Chang'e-4 Mission

China plans to send the Chang'e-4 lunar probe to land in the south pole region of the far side of the moon in 2018. Chang'e-4 is consisted of three parts -lunar lander, lunar rover and relay satellite. The relay satellite nicknamed QUEQIAO was launched to the halo orbit of the Earth-Moon Lagrange Point L2 at 21:25 UTC ,May 20, 2018，and the Chang'e-4 lunar lander and rover will arrive to the Aitken Basin of the south pole region about six months later.

The LFRS (Low Frequency Radio Spectrometer) is a scientific payload on Chang'e-4 lunar lander by Chinese. LFRS shown as Fig.1 consists of three 5m long antenna, one 20cm correct antenna, low noise amplifiers, an electronic box, and the cables. The main characteristics of LFRS are shown in Table 1.

The primary motivation for LFRS is to learn about the universe through VLF spectral window which is the only part of the electromagnetic spectrum yet to be completely explored. Moon can be utilized as a shield against unwanted radiations from the earth. By taking advantage of the unique environment, LFRS is to explore and to study radio emission from the Sun and lunar surface at very low frequency (100KHz 40MHz).