[9] [9] INGENSAND H.The Evolution of Digital Leveling Techniques-Limitations and New Solutions[C]//Jubilee Seminar of Geodesy and Surveying in the Future.FIG Sweden:[s.n.],1999:15-17

[10] [10] Joseph E,Pavilidis T.Bar code waveform recognition using peak locations[J].IEEE Transaction on Pattern Analysis and Machine Intelligence,1994,16(6):630-640

[11] [11] ORFANIDIS S J.Introduce to Signal Processing[M].London,U.K:Prentice Hall International,1998:472-475