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An experiment was conducted to investigate the effects of image size (range), image polarity, and modulation transfer function (MTF) on discrimination of warship targets with an electro-optical sensor. The imagery, which consisted of static warship silhouettes, was presented to subjects on a TV monitor in a controlled, laboratory environment. Image size was varied so that the target image lengths took on values of 15, 20, and 30% of the display width. MTF was varied over a relatively small range, with the best curve yielding a response of 0.5 at a spatial frequency of 15 cycles per display width and the poorest curve yielding only 0.23 at the same spatial frequency. Changes in image size caused the strongest effect, with performance at the largest image size averaging 57% higher than for the smallest image size. Correct identifications averaged 40% higher with the best MTF curve than with the worst. Performance against light targets on a gray background averaged 15% higher than for dark targets on the same background.

The MAGIC computer simulation generates target description data consisting of item-by-item listings of the target's component s and airspaces encountered by a large number of parallel rays emanating from any desired attack angle. A combinatorial geometry technique, which defines the locations and shapes of the various physical regions in terms of the intersections and unions of the volumes contained in a set of simple bodies, is used to represent complex target structures. A grid cell pattern is superimposed over the surface of the target and parallel rays are fired from each grid cell. Volume II, Part II contains : Section III: Simulation Model, Subroutine QRTIC through Subroutine TESTG; and List of Symbols and Abbreviations; Section IV: Source Listing., Produced for the Joint Technical Coordinating Group for Munitions Effectiveness. See also ADA567888 and ADA567889.

The MAGIC computer simulation generates target description data consisting of item-by-item listings of the target's components and airspaces encountered by a large number of parallel rays emanating from any desired attack angle. A combinatorial geometry technique, which defines the locations and shapes of the various physical regions in terms of the intersections and unions of the volumes contained in a set of simple bodies, is used to represent complex target structures. A grid ceil pattern is superimposed over the surface of the target and parallel rays are fired from each grid cell. Volume II, Part I contains: Section I: Introduction; Section II: Mathematical Model; Section III: Simulation Model, MAIN Program through Subroutine TOR., Produced for the Joint Technical Coordinating Group for Munitions Effectiveness. See also ADA567888 and ADA567890.

The MAGIC computer simulation generates target description data consisting of item-by-item listings of the target's components and airspaces encountered by a large number of parallel rays emanating from any desired attack angle. A combinatorial geometry technique, which defines the locations and shapes of the various physical regions in terms of the intersections and unions of the volumes contained in a set of simple bodies, is used to represent complex target structures. A grid cell pattern is superimposed over the surface of the target and parallel rays are randomly located in each grid cell. This User Manual contains: (1) A detailed description of the input variables required to execute the program (2) A description of the output (3) A sample problem., Produced for the Joint Technical Coordinating Group for Munitions Effectiveness. See also ADA567889 and ADA567890.

Recent over-the-horizon (0TH) surveillance exercises conducted by the Naval Research Laboratory in cooperation with air and surface units of the U.S. Fleet have permitted the opportunity for detection and characterization of the rotor modulations of the SH-3D helicopter. The uniqueness of the radar signature of the SH-3D rotor blade affords adequate discrimination in an environment of multiple conventional aircraft. Such echoes have been obtained from the SH-3D at line-of-sight ranges and at approximately 870 and 2070 nautical miles from the radar. Though no extensive detection statistic has yet been accumulated, use of a ship's own helicopter for locating the ship's position within the 0TH-sensor envelope has been tentatively demonstrated, as disclosed in this report.