Correction of Gravitational Acceleration at High Altitude and Low Pressure and the Application in Weighing

Abstract

Earth gravity field data is the basic data and strategic data of a country. The accurate measurement of Earth gravity field is of great scientific significance to the fields of metrology, earthquake prevention and disaster reduction, surveying and mapping, geodynamics and so on. It is of great strategic significance to the fields of Marine science, resource exploration and national security. China has a vast territory and diverse landforms. From the southeast coast to the Qinghai-Tibet Plateau, the elevation difference is more than 5,000 meters, and the elevation difference in a small range is small, and the acceleration of gravity can also be ignored. However, when the altitude difference is large, the change of acceleration of gravity will have a great impact on high-precision measurement. The effect of gravity acceleration in low altitude area and Lhasa under high altitude and low-pressure environment on the weighing instrument is compared and analyzed, and the correction method of altitude on the weighing instrument is proposed.