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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 12
Ann. Geophys., 14, 1480–1486, 1996
© European Geosciences Union 1996

Special issue: VIIIe EISCAT

Ann. Geophys., 14, 1480–1486, 1996
© European Geosciences Union 1996

  31 Dec 1996

31 Dec 1996

Errors due to random noise in velocity measurement using incoherent-scatter radar

P. J. S. Williams1, A. Etemadi2, I. W. McCrea3, and H. Todd4 P. J. S. Williams et al.
  • 1Adran Ffiseg, Prifysgol Cymru Aberystwyth, SY23 3BZ, Wales
  • 2Blackett Laboratory, Imperial College, London SW1, England
  • 3Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, England
  • 4University of Fiji, Fiji

Abstract. The random-noise errors involved in measuring the Doppler shift of an 'incoherent-scatter' spectrum are predicted theoretically for all values of Te/Ti from 1.0 to 3.0. After correction has been made for the effects of convolution during transmission and reception and the additional errors introduced by subtracting the average of the background gates, the rms errors can be expressed by a simple semi-empirical formula. The observed errors are determined from a comparison of simultaneous EISCAT measurements using an identical pulse code on several adjacent frequencies. The plot of observed versus predicted error has a slope of 0.991 and a correlation coefficient of 99.3%. The prediction also agrees well with the mean of the error distribution reported by the standard EISCAT analysis programme.

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