摘要
为了解决在多输入多输出声呐系统中,发射信号无法实现理想的正交问题,要求发射波形之间有尽可能低的互相关峰值电平和自相关旁瓣峰值电平。分析表明:传统的正交频分复用线性调频信号(OFDM-LFM)波形存在较高的ASPL。针对这个问题,采用信号分段设计的思想,提出2种新的波形结构设计方案,分别采用优化子脉冲调频带宽和调频时宽的设计方法,对每个发射阵元的LFM信号结构进行优化设计,在保证波形容易产生的基础上,增加发射信号自由度,仿真结果表明:与传统正交频分复用线性调频信号波形相比,2种方法所设计的波形具有更低的自相关旁瓣峰值电平和互相关峰值电平。
In the multiple-input multiple-output(MIMO)sonar system,realizing the ideal orthogonality of emission signals is difficult because it requires the lowest possible cross-correlation peak level(CPL)and autocorrelation side-lobe peak level(ASPL)simultaneously among transmitted waveforms.Analysis shows that high ASPL exists in the traditional orthogonal frequency division multiplexing linear frequency modulation(OFDM-LFM)waveform.Two new design plans for waveform structure,namely,optimizing subpulse frequency modulation bandwidth and frequency modulation time width,are proposed by adopting the idea of signal segmentation design to solve the aforementioned problem and optimize the LFM signal structure of each transmitting array element.Therefore,the degree of freedom of the transmitted signals is increased to ensure the easy generation of the waveform.Simulation results show that the waveforms designed in the two abovementioned methods have lower ASPL and CPL compared with the traditional OFDM-LFM waveform.
作者
刘伟烨
杨益新
刘雄厚
LIU Weiye;YANG Yixin;LIU Xionghou(School of Marine Science and Technology,Northwestern Polytechnical University,Xi’an 710072,China;Key Laboratory of Shaanxi Province Underwater Information Technology,Xi’an 710072,China;Key Laboratory of Near-ground Detection Technology,Wuxi 214035,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2023年第9期1510-1518,共9页
Journal of Harbin Engineering University
基金
国家重点研发计划(2016YFC1400200)
国家自然科学基金项目(51509204)
近地面探测技术重点实验室基金项目(6142414200102).
