A method and device for monitoring deformation of high-speed railway bridge piers based on GNSS dual antennas

Abstract

The invention discloses a high-speed train rail pier deformation monitoring method based on GNSS double antennas. Observed quantities of two antennas are used to enhance availability of GNSS satellites and improve geometric distribution of the GNSS satellites. In addition, the redundant observed quantity of the slave antenna can well weaken the multipath effect on the main antenna, and then the constraint condition of the geometrical relationship between the two antennas is utilized, so that the ambiguity resolving reliability is effectively improved and the ambiguity fixing success rate is increased. The invention further discloses a device of the high-speed train rail bridge pier deformation monitoring method based on GNSS double antennas, the GNSS base station is used for a differentialreference station in GNSS positioning, differential data are provided for monitoring station equipment, and broadcasting is carried out through communication equipment; the GNSS double-antenna monitoring device can receive GNSS reference station differential data and carry out differential positioning so as to calculate deformation parameters of the high-speed train rail bridge pier.

Description

technical field [0001] The invention relates to the technical field of high-speed rail pier deformation monitoring, in particular to a method and device for monitoring high-speed rail pier deformation based on GNSS dual antennas. Background technique [0002] my country's high-speed railway has achieved rapid development. By the end of 2018, the operating mileage of high-speed railway reached more than 29,000 km, accounting for more than 60% of the global high-speed railway operating mileage. It is estimated that by 2020, the scale of China's high-speed railway network will reach 30,000 km, covering more than 80% of large cities. With the rapid development of high-speed rail and express transportation, the requirements for operational safety have been further improved. my country's high-speed railway system has the characteristics of fast operation, small departure intervals, high traffic density, large passenger volume, and high punctuality rate. Once safety cannot be guar...

AI Technical Summary

Problems solved by technology

However, due to the special nature of the high-speed railway bridge piers, only part of the GNSS satellites can be received, resulting in a poor geometric distribution of the observation satellites, which reduces the availability of the GNSS satellites, and under adverse environmental conditions, the initialization time of the receiver with better performance also takes a few minutes It is difficult for a receiver with poor performance to complete the initialization after ten minutes or less

[0005] In summary, the current conventional RTK technology is affected by the occlusion of bridge piers, and the number of GNSS satellites received is small, which reduces the availability of GNSS satellites, and the geometric spatial distribution of GNSS satellites is poor, making RTK initialization time longer and ambiguity fixed rate lower

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