Accuracy of Bearing estimation FOR RADIO SOURCE WITH NONUniform
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 angleofarrival passive location system
consisting of mutually coherent circular antenna arrays implementing onestep
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
CramerRao Lower Bound for the case of Gaussian random radio emission. The
wellknown expression of angle estimator accuracy in the case of banduniform
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 timewindow 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 KeiserBessel can be useful in
the case of sparse arbitrary spectrum.
Keywords: passive locator, angleofarrival, circular antenna arrays,
onestep maximum likelihood estimation.
