The relative positioning precision based on GPS carrier-phase measuring can achieve minimeter level. 研究了GPS高精度载波相位测量,及在航空动态定位中应用的理论、方法和技术。
A few kinds of foreign typical combat helicopter-borne minimeter wave fire-control radars are introduced, and their functions, specifications and key technologies are analysed. 本文介绍了国外几种典型的武装直升机载毫米波火控雷达,并对其功能、技术指标、关键技术进行了分析。
This paper deals briefly with the principle and method of drawing to evaluate the flatness error according to the minimal condition ( minimum zone) and introduces the method, steps and examples measuring flatness error by means of minimeter, level and autocollimator. 本文简要地论述了按最小条件评定平面度误差的作图原理和作图方法,介绍了用指示计、水平仪和自准直仪测量时求平面度误差的方法、步骤和应用实例。
The Development of Foreign Helicopter-borne Minimeter Wave Fire-control Radar Technology 国外直升机载毫米波火控雷达技术发展现状