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机动式空馈相控阵弹道精密测量雷达结构精度分析
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摘要
本文所涉及的弹道精密测量雷达是我国第一部可用于实战和靶场测量的采用透镜式空馈体制的车载机动式大型相控阵雷达,该雷达具有很高的测量精度、良好的机动性,对系统结构也提出了很高的精度要求。作为雷达测量精度重要组成部分的系统结构精度,既对测量精度有着重大影响,其本身又极易受各种误差的影响,因此必须对系统结构精度进行合理地分析与设计。
     本文对该雷达系统结构精度进行了分析,对主要误差——天线平台变形进行了仿真分析。文中找出了影响系统结构精度的所有误差源,并采用极值法和统计法等方法进行了误差分配,提出系统的各组成部分的精度设计指标;文中还阐述了用于平台结构变形分析的有限元法基本原理和建模方法,建立了平台的有限元模型,利用I-deas软件进行了平台结构变形仿真分析,得到平台在各工况下的变形趋势,找出了设计方案的薄弱点,并据此修改了设计方案,提高了设计准确性,缩短了研制周期。
     该雷达的研制成功填补了国内空馈相控阵体制雷达的空白,对今后我国同类产品的研制具有显著的指导意义。本文对雷达结构精度的分析和对平台的有限元分析方法,可供其他雷达进行结构精度设计与分析时参考。
A accurate trajectory survey radar, which is referred by this paper, is the first type of large mobile Optical-feed Phase Array trajectory survey radar in China. This radar can be used in battle and shooting range measure, and it has very high accuracy of survey and good flexibility. So the radar put forward a very high request to the accuracy of the system structure. The precision of the radar's system structure, which is one important part of the radar's survey accuracy, has the great effect on the survey accuracy, and it can be affected by many kinds of errors. So the precision of the radar's system structure must be analyzed and designed reasonably.
     This paper analyzes the radar's system structure precision and does the computer simulation to analyze the distortions of the antenna platform that is the primary error of the radar's system structure. In this paper, all the error sources, which influence the system structure accuracy, are found out, and all the errors of the system structure are distributed by the methods of extremum principle and statistic. Based on these jobs, the accuracy design targets that must be performed by each part of the radar's structure system are pointed out.
     Aim at the platform of the antenna, this paper elaborates the basic principle and the finite element calculation modeling method which be used for the analyses to the platform structure distortion, and sets up the finite element calculation model of antenna platform. Then by using the finite element software—I-deas, the trends of the platform structure distortion under each work condition is obtained, the weakness of the design is found out, and design is modified according to these analysis.
     The successful development of this radar will fill up the local blank of the Optical-feed Phase Array radar field in China. It has an obvious instruction function to the same kind of the radar that will be developed in the future in China. The method of analysis to the radar's structure accuracy and the finite element analysis for the platform that is described in this paper can be used for the reference to other mobile radar when their system structure will be designed and analyzed.
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