利用FFT的DVOR空间辐射场性能参数监视  

DVOR Space Radiation Field Performance Parameter Monitoring Using FFT

作　　者：倪育德 孟康 NI Yude;MENG Kang

机构地区：[1]中国民航大学电子信息与自动化学院,天津300300

出　　处：《现代导航》2023年第1期20-30,共11页Modern Navigation

基　　金：国家重点研发计划(2022YFB3904304)。

摘　　要：多普勒甚高频全向信标(DVOR)是民用航空重要的测向导航系统,快速准确完成其空间辐射场性能参数的监视是保障DVOR安全运行的前提。在给出利用快速傅里叶变换(FFT)提取DVOR空间辐射场性能参数及监视流程的基础上,详细阐述了利用FFT提取相应性能参数的解算过程,提出了利用FFT检测DVOR调频副载波“缺口”的方法,并给出了相应理论基础。仿真实验表明,利用FFT能快速高精度地提取相应性能参数。通过改变无“缺口”时调频副载波的振幅进行多次实验,验证了所提“缺口”检测方法的可行性,并获得判决“缺口”的基本准则,即当调频副载波在10080 Hz处的幅值比无“缺口”时的调频副载波幅度下降5.1 d BV时,便可判断调频副载波出现“缺口”。DVOR is an important direction-finding navigation system for civil aviation.Quickly and accurately monitoring the performance parameters of its space radiation field is the premise to ensure the safe operation of DVOR.Based on the extraction of DVOR space radiation field performance parameters and monitoring process using FFT,the solution process of using FFT to extract corresponding performance parameters is described in detail,a method of detecting the“notch”of DVOR FM-subcarrier by FFT is proposed,and gives the corresponding theoretical basis.The simulation experiments show that the corresponding performance parameters can be extracted quickly and accurately by using FFT;by changing the amplitude of the FM-subcarrier when there is no“notch”,the feasibility of the proposed“notch”detection method is verified,and obtain the basic criteria for the“notch”of judgment,the basic principle of“notch”,that is,when the amplitude of the FM-subcarrier at 10080 Hz is 5.1 dBV lower than that of the FM-subcarrier without the“notch”,it can be judged that the FM-subcarrier has a“notch”.

关 键 词：DVOR 辐射场 FFT 监视 

分 类 号：TN967.1[电子电信—信号与信息处理]