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Proceedings Paper

Fundamental limits on range and velocity resolution for autodyne detection of two point target
Author(s): Jerzy Nowakowski
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Paper Abstract

Optical autodyne detection is a direct detection method for measuring relative Doppler frequency shifts induced by laser illuminated object. The method is of interest in laser radars for its relative simplicity and robustness. In this paper we discuss the estimation of ranges, relative velocity, and amplitudes for a two point target, when laser backscattered radiation is collected with a photon- bucket receiver, and registered by an incoherent autodyne detector. An analytical framework is developed to establish the fundamental limits on the resolution of such a system, and to obtain a quantitative understanding of the dependence of estimation accuracy on target separations, relative velocity, and on the number of photons available. The value of a priori knowledge for obtaining a desired estimation accuracy of a parameter of interest is discussed for selected cases. The analysis is carried out for Poisson photon statistics. The performance of various estimators is evaluated by utilizing the Cramér-Rao bound, for both signal and background shot noise limited conditions. The results presented have applications for mbust laser radars, and contribute to a better understanding of the perfonnance and potential of an autodyne detection system.

Paper Details

Date Published: 1 October 1990
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Proc. SPIE 1305, Signal and Data Processing of Small Targets 1990, (1 October 1990); doi: 10.1117/12.2321790
Show Author Affiliations
Jerzy Nowakowski, Riverside Research Institute (United States)


Published in SPIE Proceedings Vol. 1305:
Signal and Data Processing of Small Targets 1990
Oliver E. Drummond, Editor(s)

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