KEYWORDS: Sensors, Temperature metrology, Data modeling, Missiles, Infrared imaging, Computer simulations, 3D modeling, Solar radiation models, Cameras, Infrared radiation
GSIM is a simulator of infrared missile seekers. It simulates a missile flight scenario in a 3D environment from launch to arrival at the target. The radiation from objects and background is calculated using weather parameters, e. g. solar radiation and air temperature. After adding atmospheric transmission and sensor properties, the resulting seeker image is created. The primary output from GSIM is a sequence of images, generated by the seeker during the flight. In April 2005 helicopter trials were performed, where missile-like image sequences were recorded. The helicopter followed a slant path towards a number of ground vehicles, standing in a field. The recorded data has been used for evaluation of GSIM. At the evaluation, modelled temperature on background and targets was compared with radiometrically measured temperature. Simulations in GSIM were made of a selection of the recorded sequences. The difference between modelled and measured temperature is about 1 - 2 K, for both targets and background. When comparing the simulated and the original sequence, the visual impression is that there is an apparent similarity between the images. Long distance images show the strongest resemblance to reality, due to the limited level of detail in the background model.
A simulator (GSIM) for missile seekers that can be used as a general tool in missile seeker performance analysis has been developed. The simulator contains all the subsystems of a typical missile system and can simulate a missile flight scenario from launch, via target acquisition and tracking, to arrival at the target. GSIM has a fully graphical user interface and runs under Matlab on a regular modern PC. Due to a modular approach, the simulator can easily be upgraded and adapted to different prerequisites. It contains a choice of targets against sky, sea or ground backgrounds. Weather conditions, visibility, and time-of-day are taken into account when seeker images are generated. The effects of detector noise and dome heating are also modeled. The results can be presented as movies from the flight, showing both the seeker image as well as trajectories for the missile and target.
KEYWORDS: Sensors, Infrared search and track, Target detection, Signal to noise ratio, Atmospheric modeling, Global Positioning System, Point spread functions, Modeling, Sensor performance, Systems modeling
A method for calculation of the target range of an airborne IRST has been verified with data from flight trials. The calculation method includes modelling of sensor performance, atmospheric transmission and infrared radiation from target and background. The flight trials were performed with the IR-OTIS system mounted on a Saab JA37 Viggen fighter aircraft, and a similar aircraft serving as target. Detection range was measured at various flight altitudes, for front and rear aspect. The correspondence between measured and predicted range is very good, with a deviation of less than 10 %.
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