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Xu K.,Tianjin Navigation Instruments Research Institute | Li L.,Tianjin Navigation Instruments Research Institute | Sun Y.,Tianjin Navigation Instruments Research Institute | Weng J.,Tianjin Navigation Instruments Research Institute | And 3 more authors.
Zhongguo Guanxing Jishu Xuebao/Journal of Chinese Inertial Technology | Year: 2013

Inertial platform coordinate system needs to be aligned with ship coordinate system during installing inertial platform into the ship, and this can be realized by calibrating the inertial platform. When a ship is built on an inclined berth, the measurement error of leveling instrument due to the tilt angle of building berth has great influence on calibration results. An error will be produced by the placement of the leveling instrument, especially in the measurement of ship's roll. When the tilt angle is 3°, a leveling instrument with side length of 100 mm will produce an azimuth measurement error of 0.1° in measuring the roll (i.e. a leveling instrument will produce a displacement of 0.17 mm at one end), and this will bring a measurement error of 18.8″, which is intolerable for the calibration of high-precision inertial platform. In this paper, various errors caused by the placement of leveling instrument are analyzed and summarized for a ship under different postures. The measurement errors due to the inclination of mounting surface are tested by means of dual-freedom electronic leveling instrument, high-precision turntable and TM5100A auto-collimation theodolite. The experimental results agree with the calculation results.


Xu K.,Tianjin Navigation Instruments Research Institute | Jia L.-M.,Tianjin Navigation Instruments Research Institute | Zhang Q.,Tianjin Navigation Instruments Research Institute | Zhang B.,Tianjin Navigation Instruments Research Institute | And 3 more authors.
Zhongguo Guanxing Jishu Xuebao/Journal of Chinese Inertial Technology | Year: 2015

Inertial platform coordinate system needs to be aligned with ship coordinate system during installing an inertial platform into a ship, and this can be realized by calibrating the inertial platform. When a ship is built on an inclined berth, the measurement error of leveling instrument due to the tilt angle of ship-building berth has great influence on the calibration results. In particular, the improper placement of the leveling instrument would become an error source in the measurement of ship's roll. To solve this problem, an optical benchmark is set on the electronic level gauges, then a high-precision auto-collimation theodolite, i.e. TM5100A, is used to implement azimuth alignments for these gauges on benchmark platform and inertial platform to ensure the consistency of the azimuth measurements. Experimental results indicate that the azimuth alignment error is 2″, and the measurement error of level measurement is less than 0.1″, showing that the level measurement precision of inertial platform is improved. © 2015, Editorial Department of Journal of Chinese Inertial Technology. All right reserved.

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