Accuracy of Bearing estimation FOR RADIO SOURCE WITH NON-Uniform
SPectrum Structure in Analyzed BandWiDth of Passive Location System
T. Ya.
Shevgunov 1, A. V. Dubrovin 2
1
– Moscow Aviation Institute (National Research University)
2
–ZAO
“RADIY
TN”
The paper is received
on January 14, 2014
Abstract.
This paper deals with the angle-of-arrival passive location system
consisting of mutually coherent circular antenna arrays implementing one-step
maximum likelihood based estimation procedure. The question raised in the
present paper is accuracy degradation due to the arbitrary positions of
spectral components in the locator receiver bandwidth in comparison with
Cramer-Rao Lower Bound for the case of Gaussian random radio emission. The
well-known expression of angle estimator accuracy in the case of band-uniform
spectrum is compared to the results obtained by the numerical statistical modeling;
this allows one to evaluate the deterioration of the accuracy due to arbitrary
positioned spectral components. The numerical modeling also provides the
discussion for preliminary time-window filtration of the received signals in
order to increase the accuracy of angle estimator. Thus it was shown that the
common used windows such as Hann, Bartlett and Keiser-Bessel can be useful in
the case of sparse arbitrary spectrum.
Keywords: passive locator, angle-of-arrival, circular antenna arrays,
one-step maximum likelihood estimation.