利用卫星指导播种小麦英国一农学院利用接收到的来自美国军用卫星的信号，播种了１５英亩的冬小麦。在他们研制成的拖拉机上安装有全球定位系统设备，可以接收约２万公里高空轨道上２１颗卫星发出的信号。全球定位系统可告诉农民土壤肥沃程度及播种的多少，可使农民有针对... Sowing wheat using satellite guidance A British Academy of Agricultural Sciences sown 15 acres of winter wheat using signals received from U.S. military satellites. Installed on their tractor is a GPS-enabled device that receives signals from 21 satellites in orbit about 20,000 kilometers high. The GPS can tell farmers how fertile the soil is and how much sowing can give peasants a chance to ...