基于手持式GPS接受机的林区坐标差分研究

Study on the coordination difference using portable GPS receiver in forest areas

本文研究我国林业应用较多的手持式GPS接收机用手坐标差的原理、技术和方法。文章建立了基于基准站两个历元之间的直线内插模型和三个历元的抛线内插模型 ,并编制相应的VB计算程序 ,通过麦哲伦GPS2 0 0实测验证 :对于 9874 5 4 1m2 地林面积 ,采用GPS单机定位 ,其相对误差为 19 0 0 % ,而采用直线内插、抛物线内插法差分定位其面积误差为 3 0 0 %和 1 91% ,其实测定精度为 :单机± 4 9m ,直线内插差分法±3 0m ;抛物线内插法差分± 2 8m。

This article mainly studied the principles,technique and methods of portable GPS receiver machine used in coordination difference,applied mostly in forestry unit in China.It established linear interpolation model based on two epochs and parabola interpolation model based on three epochs,and made corresponding VB computable programmer.The following was proved by the practically surverying of Magellan GPS200 that for the forestry area of 9?874 541?m 2 the relative error is 19 00% by the method of single GPS machine position,but the relative error are 3 00% and 1 91% by the method of linear interpolation and parabola interpolation differential position.However,the practically surveying positioning precision is as following:±4 9?m for single machine position,±3 0?m for the method of linear interpolation and ±2 8?m for the method of parabola interpolation.