光电经纬仪坐标系统一方法研究

Unified Methods of Photoelectric Theodolite Coordinate System

光电经纬仪是试飞测试中的重要设备,其正常工作的前提条件是完成坐标系统一。传统的坐标系转换方法依赖设备调平精度,在严苛的工作环境下,如在倾斜较大的路面上布设经纬仪,或者经纬仪的调平系统无法正常工作时,传统方法就无法进行有效的坐标系统一,且耗时长、成本高,应用灵活性不够,为了解决这些问题,研究了两种坐标系统一方法,分别为直接转换法和场地标定法,两种方法均可以不依赖设备调平精度,实现坐标系统一,且转换速度快、操作灵活。分别给出两种方法的具体实施步骤和坐标转换公式的推导过程。最终在试验中,使用光电经纬仪的GPS引导功能实现了对飞机超视距跟踪,完成了两种坐标系统一方法的验证。

Photoelectric theodolite plays an important role in the field of flight test.For the sake of reliable operation of the theodolite, unification of coordinate system is the primary requirement.Traditional method for the unification of coordinate systems depends on leveling accuracy of the theodolite.However, traditional method can’t achieve the unification of the coordinate systems under the harsh working environment, for example, when the platform inclines a little bit, or the leveling mechanism can’t work normally, and it’s not flexible enough with a long time-consuming and high cost.In order to solve the problems above, two methods for the unification of coordinate system are proposed: direct conversion method and site calibration method.Neither of the two methods depend on the leveling accuracy, and both methods can unify the coordinate systems flexibly and quickly.The specific implementation procedure of the two methods and the derivation process of coordinate transformation formula are given.In the final flight test, the over-horizon tracking of aircraft is realized by using the GPS guidance function of photoelectric theodolite, and the verification of the two unified methods of the coordinate system is completed.