Maximum likelihood estimate of target angles for a conical scan tracking system in the presence of speckle
Abstract
The equation for the maximum likelihood estimate of target angle is derived for a conical scan tracking system when the target produces speckle and Gaussian noise is present. Operation with a direct detection receiver is assumed with the average photon flux large enough so that the discrete nature of photoelectric events may be ignored. For large average SNRs, the estimate is shown to be unbiased and the variance of the estimate limited by both the average SNR and the number of degrees of freedom of the detected field.
 Publication:

Applied Optics
 Pub Date:
 January 1977
 DOI:
 10.1364/AO.16.000184
 Bibcode:
 1977ApOpt..16..184L
 Keywords:

 Conical Scanning;
 Elevation Angle;
 Maximum Likelihood Estimates;
 Radar Scanning;
 Speckle Patterns;
 Tracking Radar;
 Degrees Of Freedom;
 Position Errors;
 Signal Processing;
 Signal To Noise Ratios;
 Target Acquisition;
 Communications and Radar;
 LIDAR;
 TRACKING;
 SCANNERS