Based on real time clock of GPS system,and by means of absolute time-marker,real time data acquisition between different sites was performed in the form of wireless.

As to the conservation of motion of center of mass, the method of absolute coordinate system is generally used in the teaching meterials of theoretic mechanics.

In this paper,absolute coordinates are used to define the position of each body,the kinematic joints between bodies and forces acting on or between bodies.

Spectral Radiance Absolute Calibration System for Satellite;

Absolute Calibration of Scatterometers in Near Field Region;

The camera working principle , calibration purpose, and content, nude chip detection, and the process of the relative and absolute calibration in the Laboratory are introduced.

Roderick matrix is used in absolute calibration of the system to w.

In order to improve the accuracy of observations and make further research,the in-situ relative calibration and absolute calibration of the 4-component borehole strainmeter at Guza station were made.