A method for measuring track geometric parameters based on the combination of ins/gnss and total station

Abstract

The invention provides a track geometrical parameter measurement system and method based on INS / GNSS and total station instrument combined use. The system comprises a T-shaped vehicle body assembly, an INS / GNSS inertial sensor assembly / navigation satellite receiving antenna mobile station assembly, a navigation satellite receiving antenna base station assembly, a total station instrument assembly, a reflecting mirror assembly, a track gauge measuring assembly, a high-precision mileage metering assembly and a measurement system control computer assembly. According to the track geometrical parameter measurement system and method provided with the structure and based on INS / GNSS and total station instrument combined use, in a measurement interval, a total station instrument measurement method and an INS / GNSS measurement method are alternately used in all measurement segments. The total station instrument is used at the starting point and the terminal point of each measurement segment, and absolute geometrical parameter measured values of two points of a track are provided; an INS / GNSS is continuously used in each measurement segment, and relative geometrical parameter measured values between two points of each segment are provided; the measured values of the total station instrument and the measured values of the INS / GNSS are seamlessly connected; and the two-point absolute geometrical parameter measured values of the total station instrument serve as an integrity constraint of the INS / GNSS in each segment, and it is guaranteed that the INS / GNSS can meet the measurement precision requirement in the segment.

Description

technical field [0001] The invention relates to a track geometric parameter detection device and method thereof, in particular to a track geometric parameter measurement system and method based on the combined use of INS / GNSS and a total station. Background technique [0002] At present, the rail transit system generally adopts two conventional measurement methods in the process of track construction acceptance and routine maintenance and repair, the optical detection car of the total station track geometric parameters based on the optical measurement principle; the combined measurement technology based on the inertial measurement principle and the global navigation satellite system ( INS / GNSS) inertial detection car. The former looks at a certain number of track control network CPIII points through the total station. 60 meters, can be used to insert the optical measurement prism group.) Determine the station position of the total station, the total station determines the t...

AI Technical Summary

Problems solved by technology

) to determine the station position of the total station. The total station determines the track position coordinates and geometric parameters by measuring the optical prism on the trolley. The advantages of the optical detection trolley are: high precision, suitable for external geometric parameter measurement, and when the specified conditions are met It can meet the requirements of the lateral deviation of the line and the vertical deviation of the line; the disadvantage is: low efficiency, the measurement data is discrete (usually at an interval of 0.625m), and the measurement speed is 1.8km / working day, which is not suitable for the measurement of geometric parameters inside the track

The latter measures the geometric parameters of the track in real time through the INS / GNSS track trolley. The advantages of the INS / GNSS inertial detection trolley are: high efficiency, high continuity of measurement data, and a measurement speed of more than 5km / h, which is suitable for internal geometric parameter measurement. It is especially suitable for the measurement of geometric parameters of track smoothness. The disadvantage is that it cannot meet the requirements of millimeter-level accuracy for the measurement of external geometric parameters of the track. The long-term measurement accuracy depends on whether the GNSS is valid, the odometer accuracy is high or low, and the GNSS signal quality is poor or invalid. , the measurement accuracy decreases

The patent "uses a total station to measure a track measuring trolley or a specific section of the track (at a specific sleeper)", and its method is not optimal

Images