窄带调频系统抗噪声性能改进研究  

Research on Improving the Anti-jam Performance of Narrowband Frequency Modulation System

作　　者：房印闯 田瑞丽[2] 钟圣 Fang Yinchuang;Tian Ruili;Zhong Sheng(Hebei Office of National Defense Mobilization,Shijiazhuang 050021,China;China Unicom Hebei Branch,Shijiazhuang 050011,China;Communication Petty Officer Academy Army Engineering University of PLA,Chongqing 400035,China)

机构地区：[1]河北省国防动员办公室,河北石家庄050021 [2]中国联合网络通信有限公司河北省分公司,河北石家庄050011 [3]陆军工程大学通信士官学校,重庆400035

出　　处：《廊坊师范学院学报（自然科学版）》2024年第3期80-82,共3页Journal of Langfang Normal University(Natural Science Edition)

摘　　要：通过对窄带调频系统抗噪声性能的研究,得到一种改进型相干解调数学模型。该模型采用两次相干解调的方式,通过引入上、下两条解调支路,实现了噪声的相互抵消。此外,RC滤波器的加入可有效阻隔直流分量。改进后的系统在输出信噪比和解调增益方面都有了显著的提高。As a nonlinear modulation scheme,NBFM is commonly utilized in short-range mobile communication scenarios due to its limited immunity to noise interference.An improved coherent demodulation model is obtained by studying the anti-jam performance of NBFM system.The model uses twice coherent demodulation,and the upper and lower demodulation branches are introduced to achieve the mutual cancellation of noise.In addition,the addition of the RC filter can effectively block the DC component.The output signal to noise ratio and demodulation gain of the improved system are significantly improved.

关 键 词：窄带调频 相干解调 抗噪声性能 滤波器 

分 类 号：O451[理学—无线电物理]