CAJ | 학술논문

为解决信号级声纳仿真系统的水声传输信道宽带信号波形预报问题,采用射线模型的基本原理,推导了基于射线的宽带水声信道响应函数.并在Pekeris环境条件下,分析比较了基于BELLHOP射线模型的时域宽带模型与基于BDRM模型的频域宽带模型波形预报结果.结果表明,水声信道具有典型的时域数字滤波器特征,其本质是对脉冲信号进行延迟、加权和求和,这种延迟求和会导致系统频域幅度响应函数呈现“梳状滤波器”形状.在一定条件下,射线模型与简正波模型具有同等计算精度,由于射线模型通过一次计算就能得到所有本征声线的幅度和延迟,相对于简正波模型来说,计算效率更高.同时利用射线模型,能够方便地选择接收特定角度出射的本征声线.
위해결신호급성납방진계통적수성전수신도관대신호파형예보문제,채용사선모형적기본원리,추도료기우사선적관대수성신도향응함수.병재Pekeris배경조건하,분석비교료기우BELLHOP사선모형적시역관대모형여기우BDRM모형적빈역관대모형파형예보결과.결과표명,수성신도구유전형적시역수자려파기특정,기본질시대맥충신호진행연지、가권화구화,저충연지구화회도치계통빈역폭도향응함수정현“소상려파기”형상.재일정조건하,사선모형여간정파모형구유동등계산정도,유우사선모형통과일차계산취능득도소유본정성선적폭도화연지,상대우간정파모형래설,계산효솔경고.동시이용사선모형,능구방편지선택접수특정각도출사적본정성선.
To solve the problem of broadband signal waveform prediction under underwater acoustic transmission channel for signal-level sonar simulation system, through the analysis of the basic principle of ray model, and de-duced broadband underwater acoustic channel response function based on ray model. In the pekeris environment conditions, waveform prediction results were analyzed and compared which on the basis of time-domain BELLHOP broadband ray model and frequency-domain BDRM broadband normal mode model. The results showed that un-derwater acoustic channel had typical time-domain digital filter characteristics, its essence was the pulse signals were delayed, weighted andsummarized, this led to the system frequency domain amplitude response function ap-peared “comb filter” shape. Under certain conditions, ray model and normal mode model had the same accuracy. Compared with normal mode model, the ray model was more efficient, because just one calculation was needed for all the eigenrays amplitude and delay. Using ray model can conveniently choose a particular grazing angle eigen-rays.