摘 要:文章提出了一种中频数字化的微波着陆系统接收机的设计方案,通过对 70 MHz MLS 中频信号直接带通采样数字化,采用 FPGA 可编程逻辑器件为核心的通用硬件,来实现 MLS 中频数字信号处理中的滤波、下变频、相位键控信号解调、幅度解调、峰值检测等功能;并且详细分析了该方案中所采用的几种关键技术的原理,给出了相位键控信号解调、幅度解调功能的软件仿真结果。
关键词:微波着陆系统;带通采样;数字下变频
DOI:10.19850/j.cnki.2096-4706.2021.11.015
中图分类号:TP274;V351.37 文献标识码:A 文章编号:2096-4706(2021)11-0056-05
An Intermediate Frequency Digital Design on MLS Navigation Receiver
LI Xin
(The 20th Research Institute of China Electronics Technology Group Corporation, Xi'an 710068, China)
Abstract: This paper proposes a design scheme for microwave landing system (MLS) receiver based on intermediate frequency (IF) digitization. Through the direct bandpass sampling digitization of 70 MHz MLS IF signal, and uses the general hardware with FPGA programmable logic device as the core to realize the following functions: filtering, down conversion, phase keying signal demodulation, amplitude demodulation and peak detection in MLS IF digital signal processing; and the principle of several key technologies used in this scheme are analyzed in detail, the software simulation results of phase keying signal demodulation and amplitude demodulation functions are given.
Keywords: microwave landing system; bandpass sampling; digital down conversion
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作者简介:李昕(1994—),男,汉族,陕西宝鸡人,助理工 程师,硕士研究生,研究方向:计算机。