Estimation of uncertainty in spatial straightness measurement according to next generation of GPS standard system

Next generation of Geometrical Product Specifications (GPS) is the foundation of the technology standards and metrology specifications. Estimation of uncertainty in measurement according to next generation of GPS may improve the reliability of the measurement. A method to estimate the uncertainty in spatial straightness measurement is proposed according to the requirements of next generation of GPS standard system. Based on the transparent box model given in next generation of GPS, the calculation method of uncertainty in spatial straightness measurement is deduced. And the decision rule based on the compliance uncertainty is adopted to decide whether the axis can be accepted or not. The experiment indicates that this method may assure the integrity of the verification result and improve the reliability of measurement.