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A-INS precision measurement piecewise linear fitting method aiming at track irregularity inspection

A track irregularity, A-INS technology, applied in track, measuring instrument, track maintenance, etc., can solve data waste and other problems, achieve simple calculation, ensure accuracy and reliability, and ensure measurement accuracy

Active Publication Date: 2018-08-03
WUHAN UNIV +1
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  • Claims
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Problems solved by technology

Therefore, the coordinate sequence provided by INS / GNSS has a lot of redundant information, and if only simple linear interpolation is used, a lot of data will be wasted

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  • A-INS precision measurement piecewise linear fitting method aiming at track irregularity inspection
  • A-INS precision measurement piecewise linear fitting method aiming at track irregularity inspection
  • A-INS precision measurement piecewise linear fitting method aiming at track irregularity inspection

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specific Embodiment approach

[0039] The following will combine figure 1 , providing a specific embodiment of the present invention, the specific steps are as follows:

[0040] S100A-INS system integrated navigation and positioning.

[0041] This step further includes sub-steps:

[0042] S110 uses GNSS precise positioning to obtain GNSS precise positioning results.

[0043] GNSS (Global Navigation Satellite System) can provide an absolute position reference, and GNSS precise positioning can achieve centimeter-level absolute positioning accuracy. Generally, the coordinate system of GNSS precise positioning results is the earth-centered ground-fixed coordinate system WGS84, and the sampling frequency is generally 1HZ. For GNSS precise positioning, the GNSS precise positioning algorithm can use real-time carrier differential positioning (RTK) method or precise point positioning (PPP) method. Specifically, firstly, the GNSS satellite carrier, GNSS pseudo-range observations and ephemeris data are collected i...

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Abstract

The invention discloses an A-INS precision measurement piecewise linear fitting method aiming at track irregularity inspection. The A-INS precision measurement piecewise linear fitting method comprises the following steps: (S100) allowing an A-INS system or a track inspection trolley to move forward along tracks to obtain a position and attitude determination result in an earth-centered earth-fixed (ECEF) coordinate system and converting and projecting the position and attitude determination result to plane coordinates and an elevation in an engineering coordinate system; (S200) segmenting thetracks from a starting mileage point to obtain piecewise straight line segments with a length of 0.625 meter, and obtaining a plane coordinate fitting straight line equation, an elevation fitting straight line equation and an attitude fitting straight line equation of each piecewise straight line segment by linear fitting; (S300) obtaining plane coordinates, the elevation, and attitude angles ofa to-be-solved point by virtue of the plane coordinate fitting straight line equation, the elevation fitting straight line equation and the attitude fitting straight line equation so as to calculate track irregularity parameters. The A-INS precision measurement piecewise linear fitting method aiming at the track irregularity inspection can fully utilize high-sampling-rate data of a GNSS / INS system, and the data utilization rate is high. Although the calculation is simple, the precision and reliability of A-INS rail precision measurement can be ensured.

Description

technical field [0001] The invention belongs to the technical field of A-INS integrated navigation and track precision measurement, and in particular relates to an A-INS precision measurement segmented linear fitting method for track irregularity detection. Background technique [0002] In recent years, with the rapid development of my country's high-speed rail (hereinafter referred to as "high-speed rail") technology, high-speed rail has gradually become a convenient rail transit, gradually changing the way people travel. In order to ensure its safe operation, the construction of high-speed rail has extremely strict requirements on track smoothness. Because in the high-speed driving state, small track irregularities may also bring about a large wheel-rail force, which poses a safety hazard. In order to be able to quickly and efficiently measure the irregularity of the high-speed rail track, a high-precision track precision measurement method is required. [0003] The Chin...

Claims

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Application Information

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IPC IPC(8): E01B35/00
CPCE01B35/00
Inventor 章红平陈起金易凯胡楠楠
Owner WUHAN UNIV
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