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基于光电经纬仪的飞机着陆下滑引导监视系统设计

2017-10-17张兴国

现代电子技术 2017年20期

摘 要: 基于飞机着陆下滑引导监视系统设计需求,针对现有光电经纬仪通信的缺陷,通过分析系统通信物理链路,突破了光电经纬仪之间通信转换协议设计、查表法CRC码校验快速计算、实测数据滤波模型构建等关键技术,以软件技术代替硬件板卡信号处理,实现了稳定可靠且成本低廉的飞机着陆下滑引导监视系统,实验部分验证了该方法的有效性。目前,该系统已成功应用到某型飞机灯光着陆系统试飞中。

关键词: 光电经纬仪; 数据链路层通信协议; 循环冗余码校验; 扩展卡尔曼滤波

中图分类号: TN948.64?34 文献标识码: A 文章编号: 1004?373X(2017)20?0132?04

Abstract: Based on the design demand of guidance and monitoring system for aircraft landing, the key technologies such as protocol design for communication conversion between photoelectric theodolites, rapid computation of CRC codes using table checking method, and filtering model construction for measured data were realized after analyzing physical link of system communication in view of the communication defects of the available photoelectric theodolite. The hardware board is substituted with software technology for signal processing, implementing a reliable and low?cost guidance and monitoring system for aircraft landing. In the experiment, the reliability of the system is verified. Currently, the system has been successfully applied to the trial flight of a certain model aircraft lighting landing system.

Keywords: photoelectric theodolite; DDCMP; CRC; EKF

根据型号任务要求,需要将两台光电经纬仪测量的飞机下滑的轨迹数据实时送到指挥显控台上,为决策指挥提供参考。采用硬件板卡实现DDCMP数据通信开发成本高,且开发周期长,为此开发设计了经纬仪实时数据转发平臺。此平台包括硬件平台和软件平台两部分[1]。硬件平台实现了数据通信的物理链路,软件平台实现了数据的实时接收、处理、显示及转发监控显控台的功能。

1 系统组成及信号流程

1.1 系统硬件平台

中心站计算机实时接收两台经纬仪的数据,然后分别对两条数据流按各自的通信格式进行解包,再进行数据滤波、坐标转换,然后打包成DDCMP格式的数据,通过串口、光端机发送到灯光着陆系统的智能通信处理机(ICP),再通过ICP的硬件板卡解码,最后送到监控台[2]。系统信号流程如图1所示。

1.2 软件功能模块及信号流程

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