Study on the Location Precision of PDA GPS
Liu Hong · Anhui nongye kexue · 2006
GPS navigate had many advantages in real-time,automatic,all-weather, high precision,high efficiency,multi-functional,easy and simple.In recent years it was widely used in the survey and draw of forestry high grading highway. Its precision was generall]y in 5～10?m and the SA(Selective Availability) policy was implemented by U.S.government,which made the precision of most single unit being at the level of 100?m.And this precision was far from solving the orientation problem of forest zone under most conditions.The positioning precision of holding GPS still lacked systematic research in practice.It is significant to develop the hold formula GPS in precision and so on.The stability of GPS, especially for receive model and orienting mode was probed into in the determination of the suitable localization,observation time and properties of error included in observed value.Compared with stand appearance(southern ET),in GPS's position,the systematic error that occupied to be absolutely leading status was discovered and it was an important to improve the positioning precision of holding type GPS to correct the systematic error.