短码元长度长波ASK信号的一种混沌检测方法  

A Chaotic Detection Method for Long Wave Ask Signal with Short Length Code Based on Duffing Oscillator

作　　者：吴前龙 芮国胜 刘林芳 WU Qianlong;RUI Guosheng;LIU Linfang(Signal and Information Processing Provincial Key Laboratory in Shandong,NavalAeronautical University,Yantai 264001)

机构地区：[1]海军航空大学信号与信息处理山东省重点实验室

出　　处：《舰船电子工程》2019年第6期164-168,共5页Ship Electronic Engineering

摘　　要：在对潜通信中,由于混沌振子对于时频积(时间与角频率的乘积)存在下限要求以及天线驻波比曲线的特点,在保证无码间串扰的条件之下,可能会导致部分带宽的信号无法被其检测的问题。在此背景下,针对此类短码元长度长波ASK信号提出了一种检测方法,该方法利用"嫁接"的方法生成待测序列,并且利用"嫁接"序列与原始载波信息之间在混沌振子相变过程上的联系,构造出新的混沌判决依据,实现降低阵列计算量从而降低接收机故障率的目的。仿真实验证明该方法能够在保持混沌振子检测性能的条件下检测传统混沌振子无法检测的ASK信号,且新的判据有更小的计算量。Considering the lower limit of signal TF(the product of time and the angular frequency) in chaotic detection and the characteristic of standing-wave ratio,some signals in some bandwidth may be not able to be detected in the submarine communication if the process should be with no inter-symbol interference.Aiming at the long wave ASK signal with short length code,a "graft" method is put forward to build up to-be-detected sequence. After that,a new chaotic judgment basis is built up based on the relationship between "graft" sequence and original carrier in the process of chaotic oscillator phase change in order to reduce the calculation amount of chaotic array and reduce the failure rate of the receiver.The simulation results show that this method can detect the ASK signal that can't be detected by the traditional chaotic oscillators.Additionally,this method keeps good detection ability and owns lower calculation amount of judgment basis.

关 键 词：短码元长度 DUFFING振子 待测序列 判决依据 

分 类 号：TN911.6[电子电信—通信与信息系统]