Then introduces main contrast examination and principles on three GPS RTK correct means: single point correction, multi- points correction parameter correction and searches precision of three correction means by the exami.

Due to the fact that local coordinate system is usually used in practice and coordinate and elevation in WGS-84 which are directly obtained when GPS technology is used to determine position of earth’s surface point, coordinate transformation or point correct is necessary in GPS-RTK surveying.

The analysis of BTEX gas standards by single-point calibration and multipoint calibration are compared.

In this paper,the single-calibration-ratio iteration calculating method is proposed to improve quantitative analysis method for determination of water in water-reducible paint by Gas Chromatography(GC)and some procedures in experiment are modified.

Application of spectrum correction theory in phase measurement for rotate machinery;

Study on the Application of Spectrum Correction in the Run-up and Shutdown Analysis for Rotary Machinery;

Study of Harmonic Spectrum Correction Precision in Electric Power Network;