基于合作靶标的分布式测量系统定向方法

大尺寸分布式测量系统基于多源观测交会原理,测量节点间的相对位姿关系决定了系统整体性能.工作空间测量定位系统是分布式测量系统的典型代表,其定向方法借助激光跟踪仪的靶球互换性构建几何约束条件,导致系统接收节点存在不可避免的对心误差,影响定向精度.本文研究了一种移动式合作靶标的分布式系统定向方法.通过设计集成多接收节点的合作...

Orientation method for distributed measurement systembased on cooperative target

The large-scale distributed measurement system is based on the principle of intersection of multi-source observation. Therelative position and pose relationship among the measurement nodes directly determines the overall performance of the system. Theworkspace Measurement Positioning System ( wMPS) is a typical representative of distributed measurement systems. Its orientationmethods rely on the interchangeability of target reflector of the laser tracker to construct geometric constraints, which results in inevitablecentering error existing at the receiving node of the system and affects the orientation accuracy. This paper studies a distributed systemorientation method based on mobile cooperative target. Through designing a cooperative target integrating multiple receiving nodes, thereis no need to accurately determine the structural relationship among the target receiving nodes, but to use the relative invariance of thespatial positions of the receiving nodes as rigid constraints to establish the relative position and pose relationship model of the base stationwith redundant optical plane intersection information. Combined with the initial value calculation model of resection orientation, theorientation result that is not affected by the interchangeable centering error of the receiving node is obtained. Finally, wMPS is used asthe experiment verification platform. The results show that this orientation method avoids the high-precision interchangeability of targetreflector, has good stability and effectively decreases the influence of the interchangeable centering error of the receiving node. Comparedwith traditional orientation method using standard ruler, the reference length measurement accuracy of this orientation method is improvedby about 40% .