摘要
仪表着陆系统(instrument land ingsystem,ILS)是目前应用较为广泛的飞机精密进近和着陆引导系统,ILS信号监视仪是检测ILS设备发出的信号是否准确的一种仪器。目前使用的ILS信号监视仪主要采用模拟滤波器、检波电路对信号进行处理,仪器的体积较大、精度较低、测量结果易受环境影响。本文设计了一种新型的ILS监视仪,FPGA与DSP作为信号处理平台,测量响应时间约为2.2ms,提高了仪器的实时性,并缩减了仪器的体积,满足了仪器的便携式的要求。通过快速傅里叶变换求取信号的幅值,并采用离散频谱多点卷积校正算法来校正运算结果,通过仿真确定了校正运算的最佳的窗函数和卷积长度,使仪器测量精度误差小于3‰,与目前应用的ILS信号监视仪相比,测量精度提高了约1‰。
The instrument landing system used wider is a system of precision approach and landing aircraft guidance.ILS signal Monitor can test the accuracy of the signal which issued by ILS.The main products used currently are designed by analog circuit.The signal is treated through the detection circuit,high-end analog filters.Low accuracy and bulky.A new type of ILS signal monitor is designed in this paper.Hardware circuit combined with FPGA and DSP processor,computing speed is fast,measured response time 2.2 ms,to improve the instrument real-time.And a substantial reduction in the size of the instrument meets the requirements of portable equipment.FFT is used to analyze the signal spectrum.Signal amplitude is calculated by frequency domain.The result of operation is corrected by discrete spectrum correction algorithm.Through the simulation,the optional length of windows function and the convolution are obtained.Measurement accuracy error is less than 3‰.Compared with the current device,the measurement accuracy about 1‰improved.
出处
《电子测量与仪器学报》
CSCD
2010年第9期872-877,共6页
Journal of Electronic Measurement and Instrumentation
关键词
仪表着陆系统(ILS)
幅度调制
调制度差
频谱分析
幅值修正
instrument landing system
amplitude modulation
modulation depth
frequency analysis
amplitude of the amendment
