Accession Number : AD0444070


Title :   CW RADAR FOR MEASURING HEAD-ON RADAR CROSS SECTION OF FREE-FLIGHT PROJECTILES. 1. ANTENNA FOR SIMULTANEOUS 35 AND 70GC OPERATION


Descriptive Note : Contract technical note


Corporate Author : GM DEFENSE RESEARCH LABS SANTA BARBARA CA


Personal Author(s) : Robillard, P E ; Blore, W E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/444070.pdf


Report Date : Jul 1964


Pagination or Media Count : 21


Abstract : A multiplex antenna was designed for the 35 Gc and 70 Gc radars. This antenna system was installed on the physics range ot obtain simultaneous measurements of the nose-on radar cross section of hypersonic projectiles. The 35 Gc and 70 Gc CW Doppler radars were used alternately on the physics range to measure the nose-on radar cross section of projectiles. The absorption effect previously reported was measured with this instrumentation. Due to the high cost of firings, simultaneous operation of the two radars would be desirable. In addition, simultaneous observation of radar absorption at two frequencies would provide a more precise comparison than if observations were made on two separate firings. To measure nose-on radar cross section, the axis of the radar antenna beam must coincide with the flight axis of the projectile. To operate two radars simultaneously means that the two radar beams must be coaxial. Since CW systems were being used and are to be preferred for a variety of reasons, time sharing techniques were not considered. Therefore an antenna system had to be devised which would orient two CW beams coaxially with a minimum of interaction between the two systems.


Descriptors :   *HYPERVELOCITY PROJECTILES , *RADAR ANTENNAS , *RADAR CROSS SECTIONS , ABSORPTION , ANTENNA RADIATION PATTERNS , DOPPLER RADAR , EXTREMELY HIGH FREQUENCY , HORN ANTENNAS , MEASUREMENT , MULTIPLEXING , RADAR REFLECTIONS


Subject Categories : Guns


Distribution Statement : APPROVED FOR PUBLIC RELEASE