Ground experiments and performance evaluation of the Low-Frequency Radio Spectrometer onboard the lander of Chang’e-4 mission

The Low-Frequency Radio Spectrometer (LFRS) is a scientific payload onboard the Chang’e-4 lunar lander launched in December 2018. The LFRS provides in-situ measurements of the low-frequency radio phenomena on the far-side of theMoon for the first time in human history. To evaluate the performance of the LFRS, a series of ground experiments are conducted using an engineering model of the LFRS. It is not easy to perform the experiments because the Electro Magnetic Interference (EMI) from the Chang’e- 4 lunar lander itself and the environment is very intense. The results after EMI mitigation show that the sensitivity of the LFRS may be 10 −18 W m −2 Hz −1 .