GPS在定位和面积量测中的误差分析

以河南农业大学校区为研究区域,通过手持GPS仪探讨了不同观测时长、不同观测时间以及不同区域面积对GPS精密度和稳定性的影响。结果表明:不同观测时长对GPS定位的坐标没有影响;不同观测时段中,定位时长为60 s和120 s的稳定度相差不大,而实时定位的稳定度比120 s的稳定度高3倍以上;当地块面积在3 600 m2以下时,GPS测量结果的变化幅度较大,呈不稳定状态,当地块面积在3 600 m2以上时,GPS测量结果的变化幅度逐渐变小,呈现面积越大、误差越小、精度越高的趋势。

Error Analysis of GPS in Positioning and Area Measurement

Taking the campus of Henan Agricultural University as the research area, the influence of different observation duration, different observation time and different areaon the GPS precision and stability was discussed through the handheld GPS instrument.The results showed that the coordinates of GPS positioning were not affected by the different observations duration; in different observation time interval, there was no big difference between 60 seconds and 120 seconds of positioning duration, but the stability of real-time positioning of 60 seconds was 3 times higher than that of 120 seconds; when the plot area was below 3600 m2, the change of GPS measurement result was larger, and it was not stable, when the plot area was more than 3 600 m2, the change range of GPS measurement results was gradually smaller, the larger the area, the smaller the error and the higher the accuracy.