Position Estimation of Optical Point Targets Using STARING Detector Arrays.

摘要

The problem of estimating the position of an optical point target by using a staring detector array is analyzed. Based on assumptions that the target's point-spread-function (PSF) is Gaussian, the detector response is uniform over the detector surface, and the signal and noise at the output of each detector are both Poisson-distributed, the Cramer-Rao lower bound (CRB) on the precision of intensity/position estimation is obtained, Using the CRB as a performance indicator, the following factors which influence the estimation performance of an isolated target are examined: target's intra-pixel position, signal-to-noise ratio, size of the detector relative to the PSF, size of the detector array, and dead space of the array. The CRB analysis is then extended to address the CSO (closely spaced objects) resolution issue. The degradation of the estimation performance due to the CSO interference is determined as a function of the separation and the separation orientation. Keywords: Optical point target; Starting detector array; CRB analysis. Reprints. (JHD)