Recently, at the construction site of Chaoyang terminal Shunyi section of Beijing Shenyang high speed railway, engineers and technicians from China Railway fifth survey and Design Institute Group Co., Ltd. (hereinafter referred to as “the fifth Railway Research Institute”) and Wuhan University used a Beidou inertial integrated navigation railway track geometry state measuring instrument (commonly known as Beidou inertial navigation car) to carry out multiple rounds of 49.6 km of double track ballasted track in the above section Precision measurement task. According to the high-speed railway track maintenance section of China Railway Beijing Bureau Group Co., Ltd., Beijing Shenyang high-speed railway is one of the main channels of China’s “eight vertical and eight horizontal” high-speed railway, and an important part of the Beijing Harbin Beijing Hong Kong Macao corridor. In order to improve the operation quality and efficiency, the construction units used advanced digital tamping methods in the construction of Chaoyang junction Shunyi section. < / P > < p > tamping is a kind of operation that uses tamping truck to adjust track and tamp ballast, so as to increase track smoothness and stability. The operation scheme of tamping truck needs to be determined by measurement and calculation in advance. In the early construction and maintenance of the railway, the technicians use the gauge to measure the track, which is inefficient; in the later stage, the total station instrument is used with the track measuring instrument, but only 200 meters can be measured in one hour. After using Beidou inertial navigation vehicle, it can measure 3 to 5 kilometers per hour, which greatly improves the operation efficiency and further improves the measurement accuracy. < / P > < p > “the Beidou inertial navigation vehicle can quickly and accurately obtain the three-dimensional position coordinates, attitude and gauge of the track, and realize the efficient measurement of multiple geometric parameters of the track.” Rao Xiong, technical director of comprehensive application demonstration project of Beidou railway industry of the fifth Railway Research Institute, said that compared with the precision measurement method of total station, the measurement efficiency of Beidou inertial navigation car has been increased by more than 20 times. According to the introduction, Beidou inertial navigation car can realize the measurement accuracy of railway track smoothness index in millimeter level and mileage level in centimeter level, which can meet the requirements of digital tamping for railway ballasted track. At the same time, the number of visible satellites of Beidou satellite navigation system is more, and the anti-jamming performance and reliability of the system in complex scenes are more advantageous. The release and download schedule of Microsoft Flight Simulation varies from region to region