likelihood ratio functional
angular coordinates estimation accuracy
spatial signal coherence
The theoretical studies were conducted to assess the influence of air refraction index fluctuations upon the potential accuracy of direction finding for optoelectronic assets (OEA) in accord with coherent properties of a probing signal and the radar beam’s angular fluctuations magnitude . It was determined that the greater the variance of radar beam’s angular fluctuations with respect to OEA and the greater the displacement of the true OEA position to the edge of radar’s field of view, the lower the relative variance of OEA direction estimation. In the absence of radar beam’s angular fluctuations an increase in the air refraction index fluctuations brings about an increase in the relative estimation variance. Besides, given the great magnitude of radar beam’s angular fluctuations, an increase in the air turbulence intensity causes an increase in the estimation accuracy. The higher the latter, the worse the spatial coherence of probing radiation. These regularities permit defining the probing radiation parameters which provide the minimum error scatter for OEA direction finding.