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  • Research Article
  • Open Access

Minimum Variance Signal Selection for Aorta Radius Estimation Using Radar

  • 1Email author,
  • 2, 3,
  • 2 and
  • 1, 4
EURASIP Journal on Advances in Signal Processing20102010:682037

https://doi.org/10.1155/2010/682037

  • Received: 9 March 2010
  • Accepted: 7 June 2010
  • Published:

Abstract

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 Cramér-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 1.25 GHz bandwidth with axes of 0.5 GHz and 1 GHz, respectively. Calculations show that emitted signal energy to received noise spectral density should exceed for a precision of approximately 0.1 mm for a large range of model parameters. This implies a minimum average power of 0.4  . These values are based on optimistic assumptions. Reflections, improved propagation model, true receiver noise, and parameter ranges should be considered in a practical implementation.

Keywords

  • Radar
  • Optimal Region
  • Publisher Note
  • Aortic Blood
  • Optimum Signal

Publisher note

To access the full article, please see PDF.

Authors’ Affiliations

(1)
Interventional Centre, Oslo University Hospital and Interventional Centre, Institute of Clinical Medicine, University of Oslo, Sognsvannsveien 20, 0027 Oslo, Norway
(2)
Forsvarets forskningsinstitutt, Postboks 25, 2027 Kjeller, Norway
(3)
Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, 0316 Oslo, Norway
(4)
Department of Electronics and Telecommunications, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway

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