基于分段FFT的抑制载波调相信号载波捕获方法研究  

Research on Carrier Acquisition Method of Suppressed Carrier Phase Modulation Signal Based on Segmented FFT

作　　者：冯晓文[1] 李庆坤[1] 逯继业 李春祎 FENG Xiaowen;LI Qingkun;LU Jiye;LI Chunyi(The 54th Research Institute of CETC,Shijiazhuang 050081,China;Unit 63713,PLA,Xinzhou 036301,China;College of Intelligent Manufacturing,Hebei Vocational University of Industry and Technology,Shijiazhuang 050000,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]中国人民解放军63713部队,山西忻州036301 [3]河北工业职业技术大学智能制造学院,河北石家庄050000

出　　处：《无线电工程》2022年第1期108-113,共6页Radio Engineering

基　　金：国防基础科研计划项目(JCKY2020210B025)。

摘　　要：针对在低码速率大频偏范围条件下抑制载波调相信号载波捕获困难的问题,提出了一种改进的基于分段FFT载波捕获方法。该方法根据抑制载波调相信号的载波提取特点,采取了分段并行FFT分析、两级滤波、相干累积和非相干累积的改进措施,以适应低码速率大频偏范围的载波捕获。对改进的基于分段FFT的抑制载波调相信号载波捕获方法进行了仿真。仿真结果表明,改进的方法具有较好的抗噪性能,在低信噪比条件下能够较好地完成载波捕获。Considering the difficulty in carrier acquisition of suppressed carrier phase modulation signal under low code rate and large Doppler frequency range, an improved carrier acqusition method based on segmented FFT is proposed.According to the carrier extraction characteristics of suppressed carrier phase modulation signal, this method adopts improvement measures such as segmented parallel FFT analysis, two-stage filtering, coherent accumulation and non-coherent accumulation to adapt to the carrier acquisition with low code rate and large Doppler frequency range.The improved method is simulated, and the simulation results show that it has better anti-noise performance and can realize carrier acquisition better under low signal-to-noise ratio.

关 键 词：抑制载波 分段FFT 载波捕获 消调制处理 

分 类 号：TN911.3[电子电信—通信与信息系统]