离散压缩采样结构下的宽带LFM信号识别及参数估计  

Recognition and parameter estimation of wideband LFM signal based on MWC discrete compressive sampling structure

作　　者：陈涛[1] 王思超 郭立民[1] CHEN Tao;WANG Sichao;GUO Limin(College of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2018年第8期1415-1421,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(61571146);中央高校基本科研业务费专项资金项目(HEUCFP201769);武器装备预研基金项目(61404150103)

摘　　要：针对传统均匀信道化宽带数字接收机处理宽带信号时产生的跨信道问题,以及传统宽带数字接收机带宽过大而产生的系统灵敏度降低的问题,提出了一种基于调制宽带转换器(modulated wideband converter,MWC)离散压缩采样结构的新型宽带数字接收机,该接收机可对跨信道的宽带线性调频(linear frequency modulated,LFM)信号进行脉内识别和参数估计。接收机利用周期性伪随机序列将宽带信号混频至基带和其他子带内,基带内信号包含所接收信号的全部信息。利用接收机的多路结构对带宽较窄的基带信号接收和处理提高了系统灵敏度并解决了跨信道问题。仿真实验表明,该新型宽带数字接收机可有效地对宽带LFM信号进行脉内识别,并对其初始频率和调频斜率具有良好的估计性能。To solve the problem of cross-channel signal caused by a uniform channelized wideband digital receiver and the problem of significant decline in the system sensitivity on an increase of the bandwidth of traditional wideband digital receivers,a new wideband digital receiver based on modulated wideband converter(MWC)discrete compressive sampling structure is proposed.The proposed digital receiver can identify a wideband linear frequency modulated(LFM)signal that crosses channel and estimate its parameters.In this new digital receiver,the wideband signal is mixed into a baseband and other sub-bands by a pseudo-random sequence.The baseband signal contains all the information of the received signal.Receiving and processing the narrow baseband signals by the multiplex structure of the receiver can increase the system sensitivity and solve the problem of cross-band signal in the channelized wideband digital receivers.The simulation results show that this new receiver can effectively identify the wideband LFM signal and effectively estimate the initial frequency and FM slope.

关 键 词：宽带数字接收机 跨信道信号 调制宽带转换器 线性调频信号 信号识别 参数估计 

分 类 号：TN911.23[电子电信—通信与信息系统]