Into the third dimension: development of phased array doppler sonar

摘要

With the advent of internally recording instruments in the t960's, the process of ocean investigation through "time series analysis" began in earnest. A single time (or space) series represents a one-dimensional picture of the four-dimensionalworld, a solitary light flickering in the darkness. With the advent of satellite remote sensing and Doppler sonar in the 1970's, two-dimensional images became available. While the gains resulting from this advance (and the associated field of imageprocessing) have been enormous, two-dimensional data represent a "tunnel-vision" view of reality. In situations where variability is non-homogeneous/non-stationary or strongly anisotropic, there is motivation to develop three-dimensional sensing systems.