Wideband beam patterns from sparse arrays

Conference · Fri Jan 12 00:00:00 EST 1990

OSTI ID:7107218

Anderson, F ^[1]; Fullerton, L ^[2]; Christensen, W; Kortegaard, B ^[3]

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1. Anderson (Forrest), Bernalillo, NM (USA)
2. Time Domain Systems, Huntsville, AL (USA)
3. Los Alamos National Lab., NM (USA)

Transient radiated fields due to impulsively excited apertures and aperture response due to incident impulsive waves has been the subject of considerable research in acoustics over the last decade. This research is also of importance to wideband radar. Medical ultrasound steered phased arrays use transmitted pulses consisting of from 1 to 3 cycles of a damped sinusoid, which is similar to certain radar systems. As will be shown, planar arrays using ultra-wide band pulses may be formed with very sparsely spaced elements. This makes feasible very high resolution, economical, and relatively simple, steered beam phased arrays. The resolution may be increased simply by moving the array elements further apart. Grating lobes due to aliasing are not formed when the elements are sparsely spaced. In a very sparse wide band array, element spacing effects the form, or signal shape in time, rather than the peak amplitude of the sidelobe structure. The number of elements in the aperture determines the peak sidelobe level which, in theory, may be decreased without limit. 13 refs., 7 figs.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7107218
• Report Number(s): LA-UR-90-472; CONF-900397-1; ON: DE90007532
• Resource Relation: Conference: 1. Los Alamos symposium on ultra-wideband radar, Los Alamos, NM (USA), 5-8 Mar 1990
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
RADAR
RADIOWAVE RADIATION
DIFFRACTION
ANGULAR DISTRIBUTION
APERTURES
SPATIAL RESOLUTION
COHERENT SCATTERING
DISTRIBUTION
ELECTROMAGNETIC RADIATION
MEASURING INSTRUMENTS
OPENINGS
RADIATIONS
RANGE FINDERS
RESOLUTION
SCATTERING
440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments
657002 - Theoretical & Mathematical Physics- Classical & Quantum Mechanics