手持农田面积测量终端研制

Handheld Terminal Design for Farmland Area Measurement

设计开发了一种支持多种GPS定位方式的手持嵌入式一体化农田作业面积测量终端,并针对地块面积、地块形状、GPS定位方式3个影响农田面积测量精度的因素进行了实验。结果表明:面积测量精度随地块面积增大而提高;不同形状的地块中,方形地块的面积测量精度最高,不规则地块面积测量精度的次之,条形地块的面积测量精度最差;当被测地块面积大于等于5 000 m^(2)时,任何GPS定位方式测量误差均小于3%,当被测地块在2 500 m^(2)左右时,GPS差分方式下的测量误差小于5%,可以满足实际应用要求。

An all-in-one handheld embedded terminal for farmland area measurement which supports a variety of GPS positioning modes is designed and developed. Experiments are carried out in terms of three factors affecting the accuracy of farmland area measurement:field area,field shape and GPS positioning mode. The results show that the accuracy of area measurement increases with the increase of field area. Among the fields with different shapes,square fields have the highest area measurement accuracy,followed by irregular fields and strip fields. When the measured field area is greater than or equal to 5 000 m^(2),the measurement error of each GPS positioning mode is less than 3%. When the measured field area is around 2 500m^(2),the measurement error of GPS differential mode is less than5%,which can meet the requirements of practical application.