Airborne laser scanning system error calibration method

An airborne laser scanning and system error technology, which is applied in the radio wave measurement system, satellite radio beacon positioning system, and optical devices, can solve the problems of inconsistency in the number of points and difficulty in finding them, so as to reduce operating time and improve Effects of automation and improvement of work efficiency

Active Publication Date: 2019-06-21
WUHAN GEOSUN NAVIGATION TECH CO LTD
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Problems solved by technology

However, due to the uncertainty of the laser scanning system, even if the same scene is scanned twice, the obtained scanning points will not be in one-to-one corr...

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  • Airborne laser scanning system error calibration method

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Embodiment Construction

[0043] The following describes the technical solutions in the embodiments of the present invention clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0044] An error calibration method for an airborne laser scanning system, including an error calibration step,

[0045] S1, the cycle slip detection and repair of GNSS data are implemented as follows. GNSS data includes airborne data and ground reference station data. Before using these data to complete positioning, first perform cycle slip detection and repair on the carrier phase observation value. Ensure the integrity of the data; use the ambiguity-assisted bridging method for cycle slip detection and repair. Assuming that the ambiguity of the previous epoch makes the positioning reach a small variance, then the group of ambiguities also meets the next epoch, so it can be based on the next epoch. Whether the meta-positioning va...

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Abstract

The invention belongs to the technical field of airborne laser scanning geometric positioning, and particularly discloses an airborne laser scanning system error calibration method. The method in thescheme comprises steps: error calibration is carried out, cycle slip detection and repair of GNSS data are carried out, the GNSS data comprise airborne data and ground reference station data, and theintegrity of the data is ensured; a ambiguity-assisted bridging method is adopted for cycle slip detection and repair, assuming that the previous epoch ambiguity makes the positioning reach a smallervariance, the ambiguity of the group also meets a latter epoch, the cycle slip is judged according to whether the next epoch positioning variance is close to zero, the GNSS data are differentially processed, GNSS double-difference observation equation integer ambiguity is determined, and a calibration mathematical model is established. Independent control field layout is not needed, the method issimple and easy to operate, the automation of system error calibration can be improved, the working time is reduced, and the working efficiency is improved.

Description

Technical field [0001] The invention relates to the technical field of airborne laser scanning geometric positioning, in particular to an error calibration method of an airborne laser scanning system. Background technique [0002] Laser scanning measurement technology is an important technical means for spatial data acquisition, and it is also a research hotspot in recent years. When it is mounted on a mobile platform, it can quickly obtain high-precision three-dimensional geographic coordinate data, which is the most advanced three-dimensional geographic data. One of the means of obtaining. The airborne laser scanning system integrates a laser scanner, a GNSS positioning system, and an inertial measurement device IMU. The three-dimensional position and three attitudes (pitch angle, roll angle, navigation angle) information of the mobile platform can be determined through the combination of GNSS / IMU, and Combined with the body coordinates obtained by the laser scanner, the unifi...

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Application Information

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IPC IPC(8): G01S7/497G01S19/43G01B11/24G01S17/06
Inventor 孙红星付建红张涛黎雄胡云帆胡亮亮锁应博李石平
Owner WUHAN GEOSUN NAVIGATION TECH CO LTD
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