Beam pattern probability density function for multiple echo statistics

• Autorzy: Moszyński M.
• Konferencja: 17 th Symposium on Hydroacoustics (23-26.05.2000; Jurata; Polska)
• Języki publikacji: EN

Abstrakty

EN

When fish target strength is estimated indirectly from single beam echo peak values the inverse techniques of solving the "single-beam integral equation" are recently quite satisfactorily used. This approach needs prior knowledge of beam pattern PDF, as it represents the kernel of the integral equation and is usually estimated under assumption of uniform spatial distribution of fish. However, it may be shown that in some cases this assumption not necessarily must be valid. For instance, when the density of fish is increased one receives multiple echoes from one fish observed in successive transmissions. Moreover, in some situations uniform assumption works properly only for the cases of large number of samples. Taking into account this phenomenon the accuracy of solution may be improved by including fish counting statistics in calculating the beam pattern PDF.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2000
• Tom: Vol. 3
• Strony: 149--154
• Opis fizyczny: Bibliogr. 2 poz., rys.

Twórcy

autor

Moszyński M.

• Technical University of Gdańsk, ul. Narutowicza 11/12, 80-952 Gdańsk, Poland

Bibliografia

• 1. M. Moszyński, Main lobe approximation for the target strength inverse problem, In Procedings of the Fourtn European Conference on Underwater Acoustics, Rome, Italy, Vol (2), 939-944, 1998.
• 2. M. Moszyński, A. Stepnowski, The statistics of fish echo traces for beam pattem PDF calculation, In Procedings of the Fifth European Conference on Underwater Acoustics, Lyon, France, 2000.