The character of the m sequence and the Costas loop have been discussed at the beginning of the paper . Then three parts were discribed in detail . First is the method of recognition and reconstruction of the m sequence, then how to display the frequence of the sequence is also concerned . As an quite important part, the implementation of the system is introduced in an sole chapter . All of those are important parts of the key preparatory research granted from national defence of Tenth Five-year plan . The ...