Jitter-Induced Clutter In Staring Sensors Arising From Background Spatial Radiance Gradients

Paul K. Mazaika

doi:10.1117/12.932664

Abstract

Jitter induced clutter leakage in a staring sensor depends on the spatial gradients of background radiance, the detector footprint, and the line-of-sight-jitter frequency characteristics. The clutter problem is very severe when there are sharp radiance gradients or edges in the scene. Clutter leakage models which describe the background by a spatial power spectrum underestimate clutter leakage because they lose the edge information. The model developed in this paper relates clutter leakage to background radiance gradients and the sensor characteristics. The distribution of clutter amplitudes is not Gaussian (even for Gaussian jitter and spatially Gaussian backgrounds); extreme values occur much more often than predicted by PSD analyses. These extreme values affect sensor threshold levels and the associated system data rates. An effective "jitter equivalent angle" is derived for the sensor which is independent of the background. Analysis of Skylab photos in the visible and near IR spectral regions indicates radiance gradients are approximately exponentially distributed and the RMS jitter clutter leakage is proportional to the footprint size raised to the 1.5 power.

Citation Download Citation

Paul K. Mazaika, Paul K. Mazaika, } "Jitter-Induced Clutter In Staring Sensors Arising From Background Spatial Radiance Gradients", Proc. SPIE 0304, Modern Utilization of Infrared Technology VII, (31 March 1982); doi: 10.1117/12.932664; https://doi.org/10.1117/12.932664

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