Annular apertures for angular tracking

The estimation of the angular position of a target based on its image is considered when the image is formed with a telescope possessing an annular pupil and is sensed with a four-quadrant noncoherent detector. The Cramér-Rao lower bound on the estimation error is calculated as a function of the lin...

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Veröffentlicht in:Applied Optics 1977-09, Vol.16 (9), p.2438-2440
Hauptverfasser: Elbaum, M, Greenebaum, M
Format: Artikel
Sprache:eng
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Zusammenfassung:The estimation of the angular position of a target based on its image is considered when the image is formed with a telescope possessing an annular pupil and is sensed with a four-quadrant noncoherent detector. The Cramér-Rao lower bound on the estimation error is calculated as a function of the linear obscuration ratio for unresolved targets in the shot-noise limit. The ratio influences the error both via the shape of the telescope point spread function (PSF) and via the SNR. The error increase associated with the PSF becomes significant for greater, similar 0.5.
ISSN:1559-128X
0003-6935
1539-4522
DOI:10.1364/AO.16.002438