Time domain modal beamforming for a near vertical acoustic array
Crocker, Steven Edward
Miller, James H.
MetadataShow full item record
Ocean acoustic tomography permits the mapping of various properties of a body of water through indirect means. The technique utilizes travel time variations for an acoustic signal to determine the structure of the ocean medium via inverse mathematical methods. The scale of any tomography experiment is fundamentally limited by the signal to noise ratio at the receiver/ Through the use of a near vertical acoustics array, normal mode modeling of the local environment and a modal beamformer, array gains are possible which greatly extend the maximum separation between source and receiver. Additionally, the technique provides temporal resolution of the model components of the arriving signal. A time domain modal beamformer for a near vertical acoustic array has been developed. It has realized a nominal array gain of 6 dB for the Heard Island Experiment vertical array deployed off California. The primary obstacle to the technique remains inadequate array geometry description.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Detection and classification of low probability of intercept radar signals using parallel filter arrays and higher order statistics Taboada, Fernando L. (Monterey, California. Naval Postgraduate School, 2002-09);The term Low Probability of Intercept (LPI) is that property of an emitter that because of its low power, wide bandwidth, frequency variability, or other design attributes, makes it difficult to be detected or identified ...
Chiang, Chung-Jung. (Monterey, California. Naval Postgraduate School, 1992-09);Estimating the frequencies of signals in a noisy environment has numerous applications in digital signal processing. In December 1980, Golub and Van Loan proposed a spectral estimator called the Total Least Squares (TLS) ...
Garner, William G. (1959);A stable K-band signal generator which uses an ammonia beam maser as a reference is described. The signal generator has a stability of one part in 10⁷ over periods of one hour or more and one part in 10⁸ for shorter ...