The preparation of thin aource book was a Joint effort of a number of dedicated people, and reflects the technical judgement, of many persons, most of whom have been given due credit, it is hoped. Certain sources have been relied on so heavily that their authors must be given special recoguition.The foremost of these contributors is Ronald A. Ericknon, Navl Weapons Center, China Lake, California. Vot only is his work quoted extensively throughout the book, but also his detailed and expert review of the major chapters of the book wau invaluable in r harpening and focusing the maerial.
This study investigated the effect of sun angle and ground texture on tank target acquisition using a 1:1000 terrain table to simulate a pop-up maneuver. Using a three-by-two repeated measures design, three groups of ten subjects each were tested at one of th~ee simulated sun angles (0, 90, and 180 degrees) and at two terrain textures (hilly and flat). Starting at a maximum simulated slant range of 8500 feet, slant range was reduced by 500 foot steps during successive 30-second trials until a correct target detection occurred. Although the main effects of sun angle and terrain texture on slant range and total search time were not significant, a highly reliable interaction between these variables was found. For the hilly portion of the terrain table, the 90-degree sun angle group had a significantly shorter slant range and required significantly more search time than the zero or 180-degree sun angle groups. This result is attributed to the interaction of large amounts and depths of shadows in hilly terrain and the difficulty of acquiring a tank target when its shadow is located at the side of the tank.
Studies were performed t o determine t h e e f f e c t s of scene r o t a t i o n on t a r g e t a c q u i s i t i o n performance. Video t a p e s of simulated s t r a i g h t approaches t o s u r f a c e v e h i c u l a r t a r g e t s were made a t constant o f f s e t , a l t i t u d e , and speed using a t e r r a i n t a b l e (600:l) and a gimbal mounted TV camera. Detection and (separate) r e c o g n i t i o n tests were then made under load (button-pushing) and no-load conditions. t h e r o t a t e d ( r o l l -p i t c h ) and non-rotated (yaw-pi tch gimbal order) Conditions o r between t h e load/ no-load conditions. and e r r o r s c o r e s f o r gimbal o r d e r b u t again not between load/no-load conditions. t h a t t h e sensor l i n e of s i g h t should be s t a b i l i z e d o r d e r o l l e d i f maximum r e c o g n i t i o n performance is t o b e r e a l i z e d using a i r b o r n e e l e c t r o -o p t i c a l systems in ground t a r g e t a c q u i s i t i o n .No d i f f e r e n c e s i n d e t e c t i o n s l a n t range and erroneous d e t e c t i o n s were found between S t a t i s t i c a l l y s i g n i f i c a n t d i f f e r e n c e s were found between t h e r e c o g n i t i o n ranges It was concluded
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