Quantities analysis of human information using GPS receiver and DLW method

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GPS is funded by and controlled by the U.S.Department of Defense (DOD). While there are many thousands of civil users of GPS world-wide, the system was designed for and is operated by the U.S. military. GPS provides specially coded satellite signals that can be processed in a GPS receiver, enabling the receiver to compute position, velocity and time.Four GPS satellite signals are used to compute positions in three dimensions and the time offset in the receiver clock. We already have been studied to use this Global Positioning System in applying to Physical Activity. Estimation of moving distance is to get accuracyusing handy GPS receiver And with Doubly Labeled Water method. Human movement activity was analyzed. Validation against the precise and near continuous respiratory gas exchange has demonstrated that the method is accurate(1〜3%)and has a precision of 4% to 7%, depending isotope dose, length of elimination period, and frequency of sampling(two-point vs. multipoint). The method is based on a number assumptions that must be taken into account depending on the application of human activity. There is still some debate on refinement of the kinetic model. And we can consider the DLW method the gold standard for assessing energy expenditure.