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Ann. Geophys., 14, 1480-1486, 1996
www.ann-geophys.net/14/1480/1996/
© European Geosciences Union 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
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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