车载光测设备测角误差影响因素的分析

为了实现车载光测设备的高精度测量,从车载平台变形、自主定位、定向三方面分析了影响车载光测设备测角误差的因素。车载平台向下平移对俯仰角测角误差造成的影响随着距离的增加而减小,旋转变形中偏向角对方位角测角误差的影响较小,两者可以忽略不计。自主定位由于垂线偏差的存在,理论上对方位角测角误差的影响最大为6.557″,俯仰角测角误差的影响最大为2.827″。自主定向对方位角测角误差的影响最大为2.06″,俯仰角则没有影响。分析数据结果表明:自主定位、定向对车载光测设备的测角误差影响较大,车载平台变形中绕X、Z轴旋转变形影响较大,其他变形的影响可忽略。上述分析仿真为进一步提高车载光测设备的测角精度提供了理论依据。

Analysis on influencing factors of angular measurement error for vehicular optical measurement

In order to achieve the high-precision measurement for vehicular optical measurement,the influencing factors of the angular measurement error for vehicular optical measurement from three aspects including vehicle platform deformation,autonomous position and orientation are analyzed.The influence of the angular measurement by the deformation of translation and the heading angle of rotation is very small; both of them can be negligible.The most influence of azimuth angular measurement error is 6.557″ and deflection angular measurement error is 2.827″in theory due to the vertical deflection.The most influence of azimuth angular measurement error is 2.06″ due to the autonomous orientation; the elevation angle is not affected.The analysis data result shows that the influence of angular measurement error for vehicular optical measurement is big by autonomous position and orientation and the rotation of X,Z axis,the other can be ignored.It provides the theoretic basis for improving angular measurement precision of vehicular optical measurement through analysis and emulation.