一种适用于跳频通信系统的多维信号检测方法  

A Multidimensional Signal Detection Method for Frequency Hopping Communication System

作　　者：刘会红[1] 陈敬乔[1] 潘申富[1] 姚舒予 LIU Huihong;CHEN Jingqiao;PAN Shenfu;YAO Shuyu(The 54th Research Institute of CETC,Shijiazhuang 050081,China;School of Physical Science and Technology,Guangxi University,Nanning 530004,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]广西大学物理科学与工程技术学院,广西南宁530004

出　　处：《无线电工程》2023年第8期1869-1874,共6页Radio Engineering

摘　　要：跳频信号中心频率的伪随机跳变,使跳频信号的检测比常规非跳频信号要困难很多。针对跳频通信系统中的自动对星问题,提出了适用于跳频通信系统的检测算法,解决了跳频同步前由于信号时断时续导致的自动对星难题。采用时域分析、频域分析、带宽检测和功率检测等多维域分析方法,对跳频信号进行了不同维度的累积和分析,达到了对跳频信号精确捕获的目标,并通过多跳平均完成功率估计。Matlab仿真结果表明,在5 dB时信号检测概率大于80%,10 dB时信号检测概率大于98%;检测概率变化带来的功率波动小于0.1 dB,满足低信噪比工作需求;功率估计精度高,波动在0.5 dB左右,估计误差小于2.6%,可为天线跟踪提供可靠的功率估计值。提出的方法运算量适中,门限易于选择,能适应低信噪比环境,且具有稳定可靠、检测准确度高和功率估计精度高的优良性能,可应用于工程实践中。Due to the pseudo random jump in the center frequency of frequency hopping signals,the detection of frequency hopping signals is much more difficult than conventional non frequency hopping signals.A detection algorithm suitable for frequency hopping communication systems is proposed to address the problem of automatic star alignment in frequency hopping communication systems,which solves the problem of automatic star alignment caused by intermittent signals before frequency hopping synchronization.By using multidimensional domain analysis methods such as time-domain analysis,frequency-domain analysis,bandwidth detection,and power detection,the frequency hopping signal is accumulated and analyzed in different dimensions,achieving the goal of accurately capturing the frequency hopping signal and completing power estimation through multi hop averaging.The Matlab simulation results show that the signal detection probability is greater than 80%at 5 dB,and greater than 98%at 10 dB.The power fluctuation caused by the change in detection probability is less than 0.1 dB,meeting the requirements of low signal-to-noise ratio operation.The power estimation accuracy is high,with fluctuations of around 0.5 dB and an estimation error of less than 2.6%,which can provide reliable power estimation values for antenna tracking.The proposed method has moderate computational complexity,easy threshold selection;can adapt to low signal-to-noise ratio environments.It has excellent performance such as stability and reliability,high detection accuracy,and high power estimation accuracy;can be applied in engineering practice.

关 键 词：卫星通信 跳频 对星 信号检测 多维域 捕获 功率估计 

分 类 号：TN929[电子电信—通信与信息系统]