Techniques are developed to estimate directional wave spectra from point measurements made by non-stationary wave sensors. Examples of data sources are: (1) several freely drifting small wave buoys potentially deployed from aircraft, and (2) one or more wave measuring Autonomous Underwater Vehicles (AUV's) moving in programmed paths. All sensors are time-coordinated and each sensor's horizontal position is adequately established using Global Positioning System (GPS) methods. Sensor paths are assumed to remain within a zone of wave pseudo-stationarity. Procedures for sensors that are moving relative to each other are based on time domain statistical procedures utilizing stepwise, ridge regression with random selection of candidate transfer functions over a frequency/direction search block. Simulated data are used to illustrate results for pressure sensors mounted on AUV's. The techniques are also applicable to fixed-position sensor arrays currently in use.
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