Rail subgrade settlement measuring method based on combination of camera shooting, satellite and inertia measurement

Abstract

The invention relates to a rail subgrade settlement measuring method based on combination of camera shooting, a satellite and inertia measurement. A vehicle platform is provided with a camera, a satellite positioning assembly, an inertia measurement assembly, a time synchronous system, a rail vehicle relative measurement system, a data processing special-purpose computer and the like. Satellite positioning differential base stations and camera shooting survey mark base stations are distributed along a rail to constitute a combination measurement system of camera shooting, the satellite and inertia measurement or a combination measurement system of camera shooting and inertia measurement or a combination measurement system of the satellite and inertia measurement, high-precision vehicle-mounted dynamic position, altitude and speed measurement references are built through deep integration of camera shooting, the satellite and inertia measurement, high-precision measurement of rail and subgrade measurement parameters is maintained for a long time according to the rail vehicle relative measurement system, and by comparison with rail design standard data, automatic, high-precision, long-time and continuous measurement of rail subgrade settlement and rail geometric parameters is achieved.

Description

technical field [0001] The invention relates to the field of rail traffic dynamic detection, in particular to a method for vehicle-mounted railroad subgrade settlement measurement. By installing camera / satellite / inertial measurement components on the vehicle-mounted platform, satellite positioning differential stations and camera control signs are arranged along the railroad track, and real-time dynamic Measure the position, attitude, and speed information of the vehicle-mounted platform, and use the relative measurement of the rail car body to obtain the three-dimensional position and geometric parameters of the rail space. By comparing with the standard data of the track design, the automatic, high-precision, and long-term measurement of the settlement of the rail subgrade and the geometric parameters of the rail is realized. , Continuous measurement. Background technique [0002] The vigorous construction and use of rail transit infrastructure has played an extremely impo...

AI Technical Summary

Problems solved by technology

At present, inertial measurement equipment is commonly used on rail inspection vehicles and comprehensive inspection vehicles in most countries in the world. However, due to the inherent defect of inertial measurement that errors accumulate over time, the current inertial measurement on rail inspection vehicles can only measure small local areas of the subgrade. short-wave changes in the range, but cannot sensitively detect slowly changing long-wave irregularities and subsidence, and cannot achieve long-distance, long-term, high-precision subgrade settlement measurement

Chinese patent document CN101913368B discloses a system and method for rapid and precise measurement and total element data acquisition of high-speed railways. The system consists of laser scanners, digital imaging equipment, GPS receivers, IMU inertial measurement devices, industrial computers and power supply devices. Acquire 3D point clouds and geodetic oriented digital images of high-speed railway tracks, subgrades and surrounding features, and use the control points of the track control network to perform joint adjustment calculations to improve the accuracy of high-speed railway movement measurement, but the system measurement speed is only per hour 40 kilometers

This kind of rail detection method and system has problems such as low dynamic measurement speed and too dense setting of ground control signs

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