Accession Number : ADA138028

Title :   Scattering Experiments at the Ipswich Electromagnetic Measurements Facility: Calibration with Perfectly Conducting Spheres,


Personal Author(s) : McGahan,R V

PDF Url : ADA138028

Report Date : Aug 1983

Pagination or Media Count : 29

Abstract : A new electromagnetic scattering facility located at Ipswich, Massachusetts is described. A 20 x 20 x 40 ft anechoic chamber was evaluated as to wall reflection coefficient at 10, 35, 98, and 140 GHz. The frequency stability of the measurement equipment was evaluated and was determined not to be a limiting factor in making radar cross section measurements. The backscatter radar cross sections of 24 metal spheres were measured at 10 GHz and compared with theory. The spheres ranged in size from 0.218 to 8.00 inches in diameter, corresponding to a Ka range of 0.581 to 21.293. The measured radar cross sections differed from theory by less than 0.6 dB. Radar cross sections as low as -46 dBsm were measured. The calibrated facility will be used to measure canonical shapes for both metallic and non-metallic targets. The non-metallic results will be used for the Cruise Missle Surveillance Program. (Author)

Descriptors :   *Radar cross sections, *Radar targets, *Electromagnetic scattering, *Facilities, Measuring instruments, Spheres, Flat plate models, Calibration, Reflection, Stability, Surveillance, Electromagnetic properties, Rotation, Cruise missiles, Measurement, Electrical conductivity, Limitations, Frequency, Coefficients, D band, Shape, M band, Ka band, Nonmetals, X band, Backscattering, Massachusetts

Subject Categories : Test Facilities, Equipment and Methods
      Guided Missiles
      Active & Passive Radar Detection & Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE