VDES上行ID20信号帧头检测算法研究  

Research on frame header detection algorithm of VDES uplink ID20 signal

作　　者：刘紫珍 王建新[1] LIU Zizhen;WANG Jianxin(School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学电子工程与光电技术学院,江苏南京210094

出　　处：《电子设计工程》2024年第19期47-51,57,共6页Electronic Design Engineering

摘　　要：为了提高VDES上行ID20信号在低信噪比和大多普勒频偏情况下的信号检测概率,提出了一种基于频率信道化的分段相关帧头检测算法。利用频率信道化将频偏范围缩小,在每个子信道内结合本地序列分段相关、非相干积累和与恒虚警门限比较等过程对信号帧头进行检测。介绍了ID20信号模型,描述了基于频率信道化的分段相关帧头检测算法原理,理论推导了虚警率与门限因子的关系,并对算法的性能进行仿真。仿真结果表明,该算法可以抵抗4 000 Hz大频偏,并且信噪比得到了明显改善,当检测概率为0.9时,相比于VDES中常用的差分帧头检测算法的检测性能,信噪比可以提高6.3 dB。In order to improve the signal detection probability of VDES uplink ID20 signal in the case of low SNR and large Doppler frequency offset,a segmented correlation frame header detection algorithm based on frequency channelization is proposed.The frequency offset range is reduced by frequency channelization,and then the signal frame header is detected in each sub-channel by combining the processes of local sequence segment correlation,incoherent accumulation and comparison with CFAR threshold.This article introduces the ID20 signal model,describes the principle of segmented correlated frame header detection algorithm based on frequency channelization,theoretically derives the relationship between false alarm rate and threshold factor,and simulates the performance of the algorithm.The simulation results show that the algorithm can resist large frequency offset of 4000 Hz and significantly improve the SNR.When the detection probability is 0.9,the SNR can be improved by 6.3 dB compared to the detection performance of the commonly used differential frame header detection algorithm in VDES.

关 键 词：VDES 帧头检测 信道化 相关 恒虚警 

分 类 号：TN911[电子电信—通信与信息系统]