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- 2016
用于磁罗盘罗差校正的基于Sampson距离的椭圆拟合法
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Abstract:
磁罗盘被广泛应用于民用和军事领域进行导航。磁罗盘使用过程中易受环境干扰磁场影响, 使输出的航向精度降低。为保证磁罗盘正常工作, 必须在应用环境中对磁罗盘进行罗差校正, 这也是提高磁罗盘航向输出精度的关键方法。该文通过分析应用环境中干扰磁场对磁罗盘输出的影响, 基于椭圆假设, 采用基于Sampson距离的椭圆拟合算法对磁罗盘原始测量值进行拟合。基于拟合结果对磁罗盘原始测量值进行校正, 从而实现对环境干扰磁场的补偿以提高磁罗盘航向输出精度。采用该方法对KVH公司制造的C100二维磁罗盘进行多位置转台实验, 校正后磁罗盘输出航向误差均值由1.51°减小到0.25°, 验证了该方法的有效性和实用性。
Abstract：Magnetic compasses are widely used in civil and military navigation applications but they are susceptible to magnetic disturbances in the environment. Thus, the compasses must be calibrated for the magnetic effects in the environment after installation. The calibration also improves the compass accuracy. An analysis of the effects of magnetic disturbances showed that the ellipse output assumption in the Sampson-distance based ellipse fitting method could be used to fit raw magnetic compass measurements. Then, the fitting coefficients are used to calibrate the compass readings to compensate for the environmental disturbances to improve the heading accuracy. A multi-position turntable experiment was used to calibrate a C100 two-dimensional magnetic compass fabricated by KVH. After calibration, the mean heading error was reduced from 1.5° to 0.25°, which illustrates the validity and practicality of this method.
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