Accession Number : ADA517994


Title :   Generalized FFT Beamsteering


Descriptive Note : Journal article


Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC RADAR DIV


Personal Author(s) : Coleman, J. O.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA517994


Report Date : 2008


Pagination or Media Count : 4


Abstract : A receive antenna's beam, the direction of maximum gain or sensitivity, need not be rigidly oriented to the physical antenna. An array antenna, hundreds or thousands of small antenna elements laid out along a line or, more usefully, on a 2D lattice, offers an electronically controlled, agile beam or even multiple beams associated with multiple antenna outputs, a technology that can enable a military radar to precisely track many objects in flight simultaneously. The classic approach to efficiently realizing many simultaneous beams uses fast Fourier transforms (FFTs) for computational efficiency but severely restricts choices of system parameters. Generalized FFT beamsteering as described here loosens those restrictions to give system designers a larger tradeoff space and therefore opportunities for cost savings and performance gains, particularly for large digital radar arrays.


Descriptors :   *ANTENNA ARRAYS , *BEAM STEERING , *BEAM FORMING , *FAST FOURIER TRANSFORMS , PHYSICAL PROPERTIES , MILITARY EQUIPMENT , EFFICIENCY , RADAR , GRATINGS(SPECTRA) , GAIN , ANTENNAS , INFLIGHT , RADAR ANTENNAS , SAVINGS , DISCRETE FOURIER TRANSFORMS , MULTIPLE BEAMS(RADIATION) , ANTENNA LOBES , PARAMETERS , COMPUTATIONS , ANTENNA COMPONENTS , OUTPUT , DIGITAL SYSTEMS


Subject Categories : ELECTRICAL AND ELECTRONIC EQUIPMENT
      NUMERICAL MATHEMATICS
      COMPUTER PROGRAMMING AND SOFTWARE
      ACTIVE AND PASSIVE RADAR DETECTION & EQUIPMENT
      ELECTRICITY AND MAGNETISM
      RADIOFREQUENCY WAVE PROPAGATION


Distribution Statement : APPROVED FOR PUBLIC RELEASE