TAILIEUCHUNG - Báo cáo sinh học: " Research Article Minimum Variance Signal Selection for Aorta Radius Estimation Using Radar"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài:Research Article Minimum Variance Signal Selection for Aorta Radius Estimation Using Radar | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 682037 13 pages doi 2010 682037 Research Article Minimum Variance Signal Selection for Aorta Radius Estimation Using Radar Lars Erik Solberg 1 Svein-Erik Hamran 2 3 Tor Berger 2 and Ilangko Balasingham1 4 1 Interventional Centre Oslo University Hospital and Interventional Centre Institute of Clinical Medicine University of Oslo Sognsvannsveien 20 0027 Oslo Norway 2Forsvarets forskningsinstitutt Postboks 25 2027 Kjeller Norway 3 Department of Geosciences University of Oslo . Box 1047 Blindern 0316 Oslo Norway 4Department of Electronics and Telecommunications Norwegian University of Science and Technology NTNU 7491 Trondheim Norway Correspondence should be addressed to Lars Erik Solberg Received 9 March 2010 Accepted 7 June 2010 Academic Editor Christophoros Nikou Copyright 2010 Lars Erik Solberg et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. This paper studies the optimum signal choice for the estimation of the aortic blood pressure via aorta radius using a monostatic radar configuration. The method involves developing the Cramer-Rao lower bound CRLB for a simplified model. The CRLB for model parameters are compared with simulation results using a grid-based approach for estimation. The CRLBs are within the 99 confidence intervals for all chosen parameter values. The CRLBs show an optimal region within an ellipsoid centered at 1 GHz center frequency and GHz bandwidth with axes of GHz and 1 GHz respectively. Calculations show that emitted signal energy to received noise spectral density should exceed 1012 for a precision of approximately mm for a large range of model parameters. This implies a minimum average power of MW. These values are .

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