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• W3158016705 abstract "Hyperbolic functions are widely used to write solutions to ordinary differential equations and partial differential equations. These functions are nonlinear in parameters, which makes it difficult to estimate the parameters of these functions. In the paper, two-step algorithms for estimating the parameters of hyperbolic sine and cosine (sinh and cosh) in the presence of measurement errors are proposed. At the first step, the hyperbolic function is transformed into a linear difference equation (autoregression) of the second order. Estimation in the presence of noise of observation of autoregression parameters using ordinary least square (OLS) gives biased estimates. Modifications of the two-stage estimation algorithm based on the use of the method of total least squares (TLS) and the method of extended instrumental variables (EIV), hyperbolic sine and cosine in the presence of errors in measurements are proposed. Numerical experiments have shown that the accuracy of the parameter estimation using the proposed modifications is higher than the accuracy of the estimate obtained using the ordinary least squares method (OLS)." @default.
• W3158016705 created "2021-05-10" @default.
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• W3158016705 date "2021-04-01" @default.
• W3158016705 modified "2023-10-01" @default.
• W3158016705 title "Estimation of Parameters of Hyperbolic Functions with Additive Noise" @default.
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• W3158016705 doi "https://doi.org/10.4028/www.scientific.net/ast.105.302" @default.
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