6 October 2011 Time-correlated single-photon counting laser radar in turbulence
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Abstract
A time-correlated single-photon counting (TCSPC) laser radar system can be used for range profiling of objects with high time resolution and dynamic range. A system setup is described and daytime outdoor measurements over distances up to 1 km are presented. The system has 114 ps full width half maximum system response, indicating a Rayleigh criterion resolution of two surfaces separated by 17 mm and much better with more advanced signal processing methods. The high dynamic range and time resolution allows measurement of distances between different optical surfaces in objects such as optical sights. The system thus has a potential use to classify objects and remove false alarms in an optics detection system. Effects of atmospheric turbulence and background radiation in daytime conditions are analyzed. A method for determining the scintillation index in noisy data using the temporal autocorrelation is described. System performance calculations based on measured data indicate that the performance necessary to detect characteristic features of optical sights and other retroreflecting objects may be found in reasonable dwell times well below 100 ms.
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Markus Henriksson, Markus Henriksson, Lars Sjöqvist, Lars Sjöqvist, "Time-correlated single-photon counting laser radar in turbulence", Proc. SPIE 8187, Technologies for Optical Countermeasures VIII, 81870N (6 October 2011); doi: 10.1117/12.898032; https://doi.org/10.1117/12.898032
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