摘要
手持式GPS的标称精度为10～15m，但在实际应用中其单点定位精度在无SA政策时仅为15～30m，因此在一定程度上限制了它的应用。本文通过实验研究其定位稳定性，绝对定位精度，得知手持式GPS定位误差主要以系统误差和粗差为主。粗差主要来源于观测条件，如卫星通视条件欠佳等，而系统误差主要来源于GPS定位卫星和定位信号的大气延迟等，由于偶然误差具有n趋近无穷大，期望值趋近于零的特性，因此根据均值模拟修正法，对观测误差进行识别和改正，最终可以获得8m左右的手持式GPS定位精度。
The PDA GPS standard precision is 10-15m, but in practical application its location precision of simple point without SA policy is only 15-30m. Therefore it is limited in the application on scientific research. This article discusses its location stability, absolute location precision through experiment, knowing the position error of the PDA GPS mainly is system error and error. The observation condition is the root of error, such as satellite intervisibility condition unsatisfactory; the atmospheric detention of the GPS localization satellite and localization signal is the root of system error. The accidental error＇s character is that when the n is infinite it goes on forever, its expectation value close 0, therefore based on the method of average value simulation correction, the observation error would be recognized and corrected. Finally we may obtain about 8m location precision of the PDA GPS.
出处
《工程地球物理学报》
2006年第6期478-483,共6页
Chinese Journal of Engineering Geophysics
