摘要
本文提出了一种副载频调幅波的数字化解调方法,采用超外差相干接收体制,利用数字下变频和分时复用技术降低解调系统使用硬件资源,并完成了Matlab仿真验证。仿真结果表明数字化解调方法的正确性和有效性,最后在单片低成本可编程逻辑器件上完成了工程设计和实现。基于数字化解调方法的解调系统具有抗干扰能力强、系统构成简单的特点,有利于设备的小型化,且在各种工作环境下的性能保持稳定和可靠。
A digital demodulation method of sub-carrier amplitude-modulated signal is proposed in this paper,and super heterodyne coherent receiving system,digital down converter and time-shared multiplex technology are used to decrease the hardware resource.Matlab simulation is accomplished,and the simulation results demonstrate the correction and validity of digital demodulation method.Finally,the design is realized in a low cost FPGA.The demodulation system based on digital demodulation method is strong in anti-interference.The simple composition is convenient for the miniaturization of device,and its performance is stable and reliable in different work environment.
出处
《空天防御》
2018年第3期26-30,共5页
Air & Space Defense
关键词
副载频
调幅
解调
数字化
sub-carrier
amplitude modulation
demodulation
digital
