The History and Development of The Low-Frequency Radio Observation

The very low frequency radio wave (<40MHz) is an important radio frequency range of modern astronomical observation. The extremely low frequency detection can carry out important research about solar outburst, star formation, galaxy evolution and the early universe etc. But for signal with frequency less than 10-20MHz, because of the Earth's ionosphere reflection or serious distortion effects and low frequency radio interference sources on earth, it is unable to research on such band. The far-side of the moon is a unique platform for low-frequency radio observation, which is an ideal environment compare to the Earth. In this paper, we present an overview of the typical low frequency radio telescopes around the world since the birth of radio astronomy. We give a retrospective summary on the scientific significance and development status of low frequency radio astronomy, and introduce in detail about the parametric and technical points of these low frequency telescopes. We also introduce CE-4's low frequency radio spectrometer which will be the important instrument for low frequency radio observation in few years.