In order to quickly and accurately calculate the vehicular earthwork in water resources and hydro-electric project

based on the ultrasonic distance measurement

a new way of calculation is proposed

using ultrasonic sensors array.The system construction and principles are introduced

and the available algorithms is analysed.The system uses DSP as the controller

adds stepping motor

temperature monitor and so on that the accuracy is improved.It works fast and effectively with a high performance/cost ratio.