| 摘要: |
| 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。 |
| 关键词: 射线模型 宽带传播模型 波形预报 |
| DOI： |
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| 基金项目:国家重点基础研究发展计划(973 计划) |
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| Broadband waveform prediction based on BELLHOP model |
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| Abstract: |
| 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 deduced 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 underwater 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 appeared “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 eigenrays. |
| Key words: ray model broadband propagation model waveform prediction |
