【作者】 卜广东；

【导师】 蒋立辉；

【作者基本信息】 中国民航大学 ， 通信与信息系统， 2009， 硕士

【摘要】 DVOR(多普勒甚高频全向信标)是当今民航最为常用的通信导航设备之一,可以给民航飞行器提供角度信息。监控器是DVOR导航系统的重要组成部分之一,其接收DVOR导航系统发射的电磁信号、解调信号并与正确值相比较,从而判定DVOR导航系统的工作状态是否正常。在系统分析DVOR导航系统及监控器原理的基础上,针对DVOR导航系统的典型产品DVOR4000,提出了DVOR监控器的数字化改进方案。在传统方案中,参数提取过程中所涉及的滤波器、FM解调以及莫尔斯码识别均由模拟电路完成。新的方案采用数字电路代替原方案中的模拟电路,完成对信号的分析,获得需要监控的参数。新方案主要涉及的数字信号处理方法有DFT算法、FM正交解调算法、FIR数字滤波器和改进的Goertzel算法。本文对方案所涉及的各种算法进行详细的分析,对数字化改进方案信号流程进行了详细的推理。采用SystemView和VC++软件实现了数字方案的软件仿真,软件SystemView完成对方案数字电路的仿真,VC++编写数字方案的可视界面。最后利用DSP芯片TMS320C5409完成了数字方案的硬件实验。更多还原

【Abstract】 DVOR (Doppler VHF omni-directional Range) is one of the equipments most commonly used in today’s civil aviation communications and navigation. It provides the perspective information for the aircraft. As the important part of the DVOR navigation system, the monitor receives the electromagnetic signals transmitted by the DVOR system, thereby determining the working state of the DVOR navigation system.At the basis of analysis for the principle of DVOR navigation system and monitor, an improved digital method is arised aim at the DVOR4000 which is one of the most representative products of DVOR system. In the traditional method, the filter, FM demodulator as well as the Morse code identification in the parameter extraction process are completed by the analog circuit. In stead of analog circuit ,the new method completes the parameter extraction process with the digital technique. The digital signal processing technique mainly involved in the new method inclue DFT algorithm ,FM quadrature demodulation algorithm ,FIR digital filter and the improved Goertzel algorithm.A detailed analysis is carried out for a variety of algorithms involved in the method, and a detailed consequence is done for the signal flow of the improved digital method.The new method is simulated by the SystemView and VC++. The SystemView simulates the digital circuit of the new method and the VC++ prepare the visual interface programs of the new method. At last, the hardware experiment is completed on the DSP chip TMS320C5409.更多还原