即插即用式光纤陀螺/全站仪组合仪器常数标定方法

Calibration method for instrument constant of plug-and-play FOG/total station

仪器常数标定是即插即用式光纤陀螺/全站仪组合定向技术的一个重要环节,其目的是标定出光纤陀螺敏感轴与全站仪水平度盘面平行时全站仪竖盘的读数。将全站仪与测试转台固连,并使全站仪竖轴与转台竖轴平行。利用测试转台的定速转动功能,在光纤陀螺敏感轴近似水平情况下,使转台带动光纤陀螺/全站仪组合装置分别做顺时针、逆时针定速转动,并每周采集陀螺输出数据偶数次。导出了计算光纤陀螺敏感轴与全站仪水平度盘面间夹角的公式,进而得到光纤陀螺敏感轴水平时的全站仪竖盘读数,并以此作为仪器常数。理论分析和实验测试均表明,利用市场上常见的测试转台,该参数标定精度可达5″以内。

The calibration of instrument constant is a key technical part of plug-and-play FOG/TS（total station）, which can get the reading of TS＇s vertical disk when the sensitive axis of FOG is parallel to the TS＇s levelness disk. The TS is fixedly connected with the test turntable and keep the vertical axis of TS parallel to the vertical axis of the test turntable. With the FOG sensitive axis being approximate level, the test turntable drive the combination of FOG and TS to rotate clockwise and counterclockwise in a constant velocity respectively and the output data of the FOG were collected even times every revolution. The formula for calculating the angle between the FOG sensitive axis and the TS horizontal disk was deduced. Then the position reading of the TS vertical disk with the FOG sensitive axis being horizontal was obtained, which was regarded as the instrument constant. Theoretical analysis and experimental tests show that the instrument constant can be accurately calibrated with precision being better than 5″ by using the usual turntable.