Two-step Echo Integration Method for Accurate Estimation of Fish Abundance

Autor:	Masahiko Furusawa, Yoshimi Takao, Shinichiro Kawaguchi, Youichi Miyanohana
Rok vydání:	1992
Předmět:	Noise Nuclear magnetic resonance Accurate estimation Computer science Integrator Echo (computing) Two step Fish Hardware_ARITHMETICANDLOGICSTRUCTURES Aquatic Science Algorithm
Zdroj:	NIPPON SUISAN GAKKAISHI. 58:469-475
ISSN:	1349-998X 0021-5392
DOI:	10.2331/suisan.58.469
Popis:	The two-step echo integration method has been developed to improve the accuracy of the echo integration method which is the most important acoustic tool to estimate fish abundance. The conventional echo integration method is examined theoretically and practically to reveal the problems inherent in the method. It is shown that the errors caused by noise and unaimed scatterrers are apt to be large and selection of aimed fish echoes is difficult. These short-comings are resolved by appling the two-step echo integration method, which first integrates echoes in small cells and then integrates weighted results of the first integration in a large cell. An echo integrator has been developed to realize this method and the effectiveness of the method is confirmed through application to actual surveys.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::841b318ff3d5dc8349be192693f42670 https://doi.org/10.2331/suisan.58.469 Zobrazit plný text záznamu