Novel Multiple Phase Centre Reflector Antenna for GMTI Radar

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Authors
  1. Damini, A.
  2. Balaji, B.
  3. Shafai, L.
  4. Haslam, G.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
Adaptive cancellation of stationary clutter for a ground moving target indicator (GMTI) radar requires antenna sensing using multiple apertures. In essence, simultaneous independent observations of the target plus clutter are required. Conventionally, multiple antenna apertures can be achieved through the use of physically separated antennas, or antennas which can be controlled so that subsections are used to receive. Herein, the use of reflector antennas to effect multiple phase centers is described. Multiple feedhorns pointed laterally from the focal point of the reflector are first reviewed, with capabilities and limitations discussed. A new technique for achieving multiple phase centers with a reflector antenna is then introduced. This techniques is based on the excitation and combination of TE and/or TM modes from a single antenna feedhorn. It is shown that by proper combination of multiple Te modes from a single feedhorn, radiation patterns with separate phase centers can be produced from the same reflector. TE and TM modes can also be combined to effect the same, but this is omitted for brevity. The characteristics of the resulting radiation pattern are analysed with a view towards maximizing the separation of the antenna phase centers while maintaining symmetry between the patterns and minimizing the reduction in gain and constant phase beamwidth with respect to the reflector's conventional radiation pattern.
Keywords
GMTI (Ground Moving Target Indicator);Clutter cancellation
Report Number
DRDC-OTTAWA-SL-2003-078 — Scientific Literature
Date of publication
01 Jun 2004
Number of Pages
6
DSTKIM No
CA024499
CANDIS No
522078
Format(s):
Hardcopy;Document Image stored on Optical Disk

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