Aerothermal effects on the infrared seeker staring sensor performance of high supersonic missiles
Leite, Clelio Dinis Ferreira
Cooper, Alfred W.
Davis, D. Scott
Platzer, Max F.
MetadataShow full item record
The present work investigates the aerothermal effects on the electro-optical performance of a conceptual infrared seeker missile at Mach 4 at small angles of attack. Two window dome configurations are studied: an optical hemisphere and ellipsoidal shape window attached to a 3:1 ogive nose. A three dimensional thin-layer compressible flow solver is used to compute the flow field in front of the window and the window aerodynamic heating. A solution adaptive-grid scheme is applied to accurately compute the flow field and capture the bow shock. Noise-Equivalent-Temperature-Difference degradation due to 'background' noise of the hot window is derived and computed for 3 levels of array non-uniformity for a range of mean dome temperatures covering the whole supersonic regime. Acquisition range for a staring sensor is estimated for several maritime scenarios modeled by LOWTRAN code. Background photon flux distribution on an array generated by the hot dome is computed using radiation transfer methods using the dome temperature field obtained by computational fluid dynamic methods. It is found that array non-uniformity has a strong influence on the seeker performance. This study indicates that the non-uniformity of the dome temperature has significant influence on the array fixed pattern noise induced by dome emission and so in the seeker detection and tracking ability.
Showing items related by title, author, creator and subject.
Improvement of miss distance of missiles with imaging seekers by utilizing dynamic image processing. Francisco, Rui Manuel Alves (Monterey, California: Naval Postgraduate School, 1993-03);This theses deals with improving the miss distance of a missile, with imaging seeker(s), by utilizing dynamic image processing. In an encounter with a missile, a target tries to avoid the missile by performing a evasive ...
Chan, Joseph K. (1987-12);The tracking accuracy of a missile target seeker depends on many variables. For a target seeker using a gimbaled platform, an important variable is the friction induced by the preloaded bearings, and by the short wires ...
Moreira-Paredes, Ramiro. (Monterey, California. Naval Postgraduate School, 1993-06);This thesis studies a new data weighting function, which consists of a complex valued window known as the linear complex valued FM chirp window. This type of window, when used with the Fourier transform, produces a magnitude ...