E-O Sensor Signal Recognition Simulation: Computer Code SPOT I

摘要

This report describes a preliminary version of an engineering-type predictive users' code developed to simulate the radiative energy (signal) reaching an electro-optical sensor operating within the atmosphere. The computer code, designated SPOT, allows for the definition of a point monodirectional receiver located within a plane parallel atmosphere. Sunlight, moonlight, and ther thermal radiation emitted by the atmosphere and the ground surface characterize the natural radiative environment. In addition, SPOT allows for the definition of a plane reflective/emissive target arbitrarily oriented at a specified distance from the sensor along the sensor's line of-sight. Primary components of the radiative environment are treated in this version of the code. In particular, this includes; direct sunlight (or moonlight), controlled atmospheric emission, and uncollided target (or ground) emission. Data bases for the extraterrestrial spectral irradiance, along with the compilation of various aerosol phase matrices are used in order to provide adequate computational details. In addition, the LOWTRAN 4 atmospheric transmittance/radiance code is utilized as an integral part of the program. Various computational options provide the user with a sufficient degree of flexibility in order to perform spectral analyses of sensors operating within a variety of atmospheric conditions. (Author)