Fundamental limits on range and velocity resolution for autodyne detection of two point target

Jerzy Nowakowski

doi:10.1117/12.2321790

1 October 1990 Fundamental limits on range and velocity resolution for autodyne detection of two point target

Jerzy Nowakowski

Proceedings Volume 1305, Signal and Data Processing of Small Targets 1990; (1990) https://doi.org/10.1117/12.2321790
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

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.

Citation Download Citation

Jerzy Nowakowski "Fundamental limits on range and velocity resolution for autodyne detection of two point target", Proc. SPIE 1305, Signal and Data Processing of Small Targets 1990, (1 October 1990); https://doi.org/10.1117/12.2321790

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KEYWORDS

Doppler effect

Interference (communication)

Signal processing

Photons

Data processing

Target detection

Sensors

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