船用卫星导航设备对复合计程仪校正的探讨

Calibration of Combined Speed Log Using Shipborne Satellite Navigation Equipment

复合计程仪是舰船上的关键导航设备之一，其测速精度必须经过测速场跑迭标方法进行修正。一般来说，通过测速场进行校正过的复合计程仪是满足使用要求的，但复合计程仪每年到测速场进行校正，不但耗费工费时，还受天气、海流、海况的限制，有很多弊端。如何利用船用设备对复合计程仪进行有效的校正是本文所讨论的议题，通过对测速方法、航程计算公式、测速时间的分析，得出船用GPS接收机完全胜任复合计程仪校正工作的结论。

The combined speed log is one of the shipbome key navigation equipment. The accuracy of velocity measurement of the combined speed log can normally meet the requirements only if it is calibrated by using the method of multiple targets chasing on speed testing site. Calibrating annually the combined speed log on speed testing site costs in huge human power and time. In addition, the accuracy of velocity measurement of it is under the influence of weather, current and sea states. How to calibrate effectively the combined speed logby the use of shipborne equipment is discussed. The researches on the velocity measurement method, the range calculation equations and the analysis of spending time in velocity measurement are made to draw the conclusion that the application of GPS receiver to the calibration of the combined speed log is perfectly feasible.