| 海洋声速起伏对声传播及定位精度影响分析 |
| Influence Analysis of Sound Velocity Fluctuation in the Oceans on Acoustic Propagation and Positioning Precision |
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| DOI： |
| 中文关键词: 声速起伏 本征声线 无源定位 传播时间 精度分析 |
| 英文关键词:acoustic velocity fluctuation eigenrays passive localization propagation time precision analysis |
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| 中文摘要: |
| 海洋中声速起伏导致水声信道发生变化，进而引起声线到达结构的变化，对水声传播及定位精度产生一定影响。为讨论这一效应，基于TDOA体制建立了考虑声线弯曲的水下目标无源定位模型，分析了声速起伏对水下声传播路径及传播时间的影响，进而研究了声速起伏对水下无源定位测量精度影响程度。结果表明：当水平传播距离较大时，声速剖面起伏对声传播路径及传播时间的影响更为显著；以典型四元阵为例，若基线长度为20 km，接收阵位于水下5 km处，在不考虑其它随机误差影响下，海洋声速起伏造成的声源定位误差量级在0.5 m以内。分析结果有助于更好地利用环境特征优化无源定位测量方案，可为高精度水下无源定位系统设计及精度评估提供依据。 |
| 英文摘要: |
| The acoustic velocity fluctuation in the oceans leads to the changes of underwater acoustic channel, which change the arrival structure of soundlines and influence the acoustic propagation and the positioning accuracy. To discuss this effect, the underwater passive location model considering the sound ray bending is built based on TDOA system, the infuence of sound velocity fluctuation on underwater sound propagation path and propagation time is analyzed, and besides, the influence of acoustic velocity fluctuation on underwater passive localization accuracy is studied. The results show that the infuence of sound velocity fluctuation on underwater sound propagation path and propagation time is more significant when the horizontal propagation distance is large; take the four element array for example, if the length of baseline is 20km, the depth of receiving arrays is 5km, the influence of acoustic velocity fluctuation on positioning precision is less than 0.5m. The analysis results are helpful to optimize the passive location measurement scheme with environmental characteristics and provide basis for the design and precision evaluation of underwater passive positioning system. |
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