工作空间测量定位系统定向参数修正方法

Correction method for orientation parameters of workspace measurement positioning system

为保证工作空间测量定位系统的现场测量精度,需要在发射站姿态受到温度、震动等环境因素影响时对其定向参数进行修正。提出了一种以固定接收器为基准的定向参数修正方法,通过在工作空间内稳定参考点处安装的冗余接收器监控发射站工作状态并对定向参数进行实时在线修正,采用光平面参数描述的发射站几何模型推导了接收器坐标测量方程。在此基础上,以参考点坐标为已知条件,建立了基于共面约束的定向参数修正量优化方程,给出了平差解算方法。实验结果表明,当采用6个接收器进行修正时,系统坐标测量偏差在0.15 mm以内,满足现场大尺寸坐标测量的精度要求,有效提高了系统的可靠性、实用性。

In order to ensure the field measuring accuracy of workspace measurement positioning system, the transmitter＇s orientation parameters should be corrected accordingly when its posture is altered by environmental factors such as temperature and vibration. Utilizing fixed receivers as references, a correction method for orientation parameters was proposed. Redundant receivers were installed on stable reference points in workspace to monitor the operation status of transmitters and perform real-time online correction on orientation parameters. Coordinate measurement equations of receivers were derived from transmitter＇s geometrical model described by optical plane parameters. On that basis, optimal equations for orientation parameter correction following coplanarity constraints were established while taking reference points＇ coordinates as known condition. The adjustment algorithm was given at the same time. Experimental results indicate that when 6 receivers are used for correction, system coordinate measuring deviation is within 0.15 mm, which meets the accuracy requirement of large scale coordinate measurement. The correction method shows effective improvement of the system reliability and applicability.