Indirect fish target strength estimation using adaptive kernel

• Autorzy: Moszyński M.
• Języki publikacji: EN

Abstrakty

EN

The typical approach to the problem of indirect fish target strength estimation from data collected using single-beam system is based on inversion of probability density function (PDF) of measured fish echo level. Due to ill-conditioning of most inversion algorithms, small errors in input data, and inaccuracies in the assumed form of the kernel, may result in large errors at the output. Therefore, al! modern inversion algorithms use sophisticated techniques to achieve satisfying results, assuming fixed kernel in the inversion procedure. The paper presents different approach, which uses adaptive construction of the kernel, under assumption of non-negative constraints in the obtained estimate of fish target strength PDF. As a result, the more reliable beam pattern PDF is obtained which leads to unbiased and more accurate estimate offish target strength PDF, than in the conventional (fixed kernel) methods.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2001
• Tom: Vol. 4
• Strony: 177--180
• Opis fizyczny: Bibliogr. 5 poz., rys., tab.

Twórcy

autor

Moszyński M.

• Technical University of Gdańsk, Department of Remote Monitoring Systems, ul. Narutowicza 11112,80-952 Gdańsk, Poland

Bibliografia

• 1. Clay, C.S., Deconvolution of the fish scattering PDF from the echo PDF for a single transducer sonar. J. Acous. Soc. Am., 73: 1989-1994.
• 2. Ehrenberg, J.E., A review of target strength estimation techniques. Pp. 161-175 In Y.T. Chan, ed. Underwater Acoustic Data Processing. Kluwer Academic Publishers, 1989.
• 3. Hedgepeth, J.B., Gallucci, V.F., O'Sullivan F., Thorne, R.E., An expectation maximization and smoothing approach for indirect acoustic estimation 01' fish size and density. ICES J. Mar. Sci., 56: 36-50, 1989.
• 4. Parkinson, E.A., Rieman, B.E., Rudstam, L.G., A comparison of acoustic and trawl methods for estimating density and age structure in kokanee. Trans. Am. Fish. Soc., 123:841-854, 1994.
• 5. Stepnowski A., Moszyński M., Inverse problem solution techniques as applied to indirect in situ estimation of fish target strength, J. Acous. Soc. Am., vol. 107, No 5, pp. 2554- 2562, Fig. 1 l, Ref. 28.