[1] [1] LEICA G A．A self-compensation rotating construction laser and method for measure a tile of an axis of rotation of a construction laser：US．PCT/EP2009/ 0588 07［P］．2009-07-10.

[2] [2] YE X M , LIU J N. Carrier code phase method for digital electronic level［J］.Geomatics and Information Science of Wuhan University,2007,32(2): 180-183.(in Chinese)

[3] [3] YAN Z L,WANG J J, CHAI H J. Influence of water level fluctuation on phreatic line in silty soil model slope［J］. Engineering Geology,2010,113(5): 90-98.

[4] [4] QIU B M, WANG J W. Design of embedded stabilized platform for aerial photography ［J］.Chinese Journal of Scientific Instrument,2009,30(9): 1982-1984.(in Chinese)

[5] [5] TONG G ,WANG T ,WU ZH Y, et al..Application of high accuracy inclinometer to deformation measurement for vehicular platform［J］. Opt. Precision Eng., 2010,18(6): 1347-1352.(in Chinese)

[6] [6] CHEN X J, LI D, BAI Y, et al..Application of type-II fuzzy neural network to adaptive double axis motion control system［J］.Opt. Precision Eng.,2011,19(7): 1643-1650.(in Chinese)

[7] [7] LINESH J,SUDEESH K,RADHAKRISHNAN P,et al.．Liquid level sensor using etched silica fiber［J］. Microwave and Optical Technology Letters,2010,52(4): 883-886.

[8] [8] SOSNA, CHRISTOPH B, RAINER L, et al.. A temperature compensation circuit for thermal flow sensors operated in constant-temperature-difference mode［J］.Transactions on Instrumentation and Measurement, 2010,59(6): 1715-1721.

[9] [9] LI J R, GAO H B, WANG ZH Q, et al.. Real-time compensative leveling in photoelectric measuring equipment ［J］. Opt. Precision Eng., 2010,18(7): 1543-1546.(in Chinese)

[10] [10] JIANG W W, GAO G Y, FENG D Y, et al.. Automatic-leveling system for base-plane of large-size photoelectric equipment ［J］. Opt. Precision Eng., 2009,17(5): 1039-1044.(in Chinese)

[11] [11] CHEN M SH,JIN G ,AN Y, et al.. Design of angular momentum wheel in SGCMG using adaptive compensation PI control ［J］. Opt. Precision Eng., 2011,19(5): 1075-1080.(in Chinese)

[13] [13] HU G Y,HE P A,YUN J P, et al.. Error analysis and auto test in laser roating level［J］. Optic & Optoelectronic Technology,2005，3(8): 58-60. (in Chinese)