Maximum Number of Beams in Multibeam Sonars.
Abstract
The Nyquist sampling theorem is used to derive the maximum number of preformed beams required to adequately sample a signal field with a given line array so that the angle of signal arrival can be determined. Consider a single frequency plane wave incident upon a line array. After forming an infinite number of beams (or scanning) a plot of beam output power versus steered angle is obtained. The target bearing is the angle at which this plot is a maximum. By Nyquist sampling the plot of output power versus bearing, the plot is reconstructed from a finite number of beams. This number of beams is minimum in the sense that fewer beams result in a signal error while more beams are redundant. The Rayleigh resolvability criteria for multiple detections is investigated and compared with the previous result.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 16, 1969
- Accession Number
- ADA072569
Entities
People
- Henry Ayoub
Organizations
- Navy Underwater Sound Laboratory