英语翻译Inertial positioning system,in which an inertial platfor

英语翻译Inertial positioning system,in which an inertial platform has three mutually perpendicular axes,one of which is “up”,so that the system yields elevation as one of the outputs.Vertical accuracies from 15 to 50 cm in distances of 60 and 100 km,respectively,have been reported.The equipment cost is extremely high and applications are restricted to very large projects where terrain,weather,time,and access impose special constraints on traditional methods.