Estimation of the Two-Dimensional Spectrum of the Space-Time Noise Field for a Sparse Line Array.
Abstract
For a line array immersed in a stationary homogeneous noise field composed of plane waves of differing speeds and angles of arrival, standard beamforming is not useful for estimating the noise spectrum directionality. However, the two-dimensional spectrum of the received noise field enables resolution in temporal-frequency and in spatial-frequency and can thereby indicate the temporal-frequency content and the apparent speed along the line array of plane wave arrivals. The interrelationships and attributes of the space-time correlation, the cross-spectrum, and the two-dimensional spectrum are presented and interpreted via simple examples. A program for estimation of the two-dimensional spectrum for a sparse line array and examples of its use and interpretation are given. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 22, 1973
- Accession Number
- AD0767641
Entities
People
- Albert H. Nuttall
- Ernest M. Montavon
- G. Clifford Carter
Organizations
- Naval Underwater Systems Center