generate questions: The original idea of a Chinese satellite navigation system was conceived by Chen Fangyun and his colleagues in the 1980s. According to the China National Space Administration, the development of the system would be carried out in three steps:
Who first came up with the idea for a Chinese satellite navigation system? {sep_token} When did Chen Fangyun come up with the idea for a satellite navigation system? {sep_token} The China National Space Administration said the satellite navigation system would be developed in how many steps? {sep_token}