边界元方法分析收发分置Benchmark潜艇低频目标强度

Analyzing the target strength of Benchmark submarine by boundary element method at low and middle frequencies

收发分置的潜艇目标强度对于双基地声呐和多基地声呐的探测性能具有重要的意义。采用快速多极边界元方法分析了收发分置情况下刚硬边界Benchmark潜艇低频目标强度。结果表明,潜艇的目标强度随频率、发射角和接收角的变化而变化。频率越高,潜艇的目标强度变化越复杂。此外,当入射方向和散射方向关于正横方向对称时,潜艇的目标强度取得极大值,并且在正向散射处亦出现极大值。进一步分析了潜艇收发分置目标强度对探测的影响。结果表明,目标潜艇在不同的情况下目标强度不同,在文中的计算频率处,分置角较大时目标强度更有可能取得较大值。

The bistatic target strength of a submarine is an important parameter of the bistatic sonar and the multistatic sonar. The bistatic target strength of the Benchmark submarine is then analyzed by using fast multipole boundary ele- ment method at low and middle frequencies. The results indicate that the target strength of the submarine varies with frequency, incident angle and receiving angle, and varies more complicatedly at higher frequencies. It is also concluded that the target strength of the submarine reaches maximum when the incident and scattering directions are symmetrical with respect to the abeam direction. The target strength also reaches maximum at the point of forward scattering. In addition, the detection probability is also analyzed. The results indicate that the detection probability varies with the situation of the submarine. It is also concluded that the bistatic sonar achieves better detection probability when the bistatic angle is larger.