基于星体标定的光电跟踪系统测角精度评定

Angle accuracy assessment of photo-electric tracking system based on star calibration

测角精度是光电跟踪系统中一项最重要的技术指标,通常是以校准塔和方位标为基准进行单项误差标定再综合,其过程繁锁、周期长。介绍一种基于星体标定的精度评价方法,建立了系统误差模型,分析了该方法的标定精度。以光电经纬仪为评价目标,研究了精度评定系统组成结构、试验条件、试验和数据处理方法。试验结果表明该方法具有标定过程简单、快速,标定精度高等优点,其标定误差小于3″。

The measurement accuracy of angle is the most important specification of photo-electronic tracking system. Generally, the calibration tower and azimuth mark are taken as the reference to calibrate the single errors and then synthesize them to the total. However, this method is time-consuming and operation-complicated. A new method based on star calibration was proposed in this paper. The fundamental principle and calibration method were introduced in detail, system error model was established, and calibration accuracy of the new method was analyzed. In addition, taking the photo-electric theodolite as assessment objective, the composition of accuracy assessment system, and the method of the assessment experiment and data processing were studied. The experiment result shows that the new method has benefits of time-saving, operation-simple and high accuracy. The angle calibrated error is less than 3＂.