Oceanographic Variability and the Performance of Passive and Active Sonars in the Philippine Sea

The Philippine Sea is one of the most dynamic oceanographic environments in world; moreover, the seafloor is rough. These two factors lead to doppler and range (time) spreading of forward scattered signals. ONR supported an multi-year experiment, PhilSea_09/10/11, where a water column vertical array...

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Bibliographic Details
Main Authors: Baggeroer, Arthur B, Scheer, Edward K
Format: Report
Language:English
Subjects:
Acoustic Detection and Detectors
AMBIENT NOISE
AMBIGUITY
ARRAYS
AZIMUTH
CHANNELS
CONVOLUTION
DIRECTIONAL
DOPPLER SYSTEMS
DYNAMICS
ENVIRONMENTS
FORWARD SCATTERING
FUNCTIONS
MEASUREMENT
MOORING
NOISE
OCEAN BOTTOM
OCEANOGRAPHY
PHILIPPINE SEA
Physical and Dynamic Oceanography
SCATTERING
SIGNALS
SONAR
SOURCES
TOMOGRAPHY
TOWED ARRAYS
TOWED BODIES
VARIATIONS
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Summary:The Philippine Sea is one of the most dynamic oceanographic environments in world; moreover, the seafloor is rough. These two factors lead to doppler and range (time) spreading of forward scattered signals. ONR supported an multi-year experiment, PhilSea_09/10/11, where a water column vertical array (DVLA) by SIO, a towed array (FORA) MPL/SIO, SOFAR axis sources (T1 - T6) (SIO), J15 a moored and towed source (MIT & WHOI), and a SOFAR channel source (MP200) (U of Wash). All the sources and receivers were designed to operate in the 50 - 500 Hz band. The long term objective of the experiment is to characterize the short and long term variability of signal propagating in the Philippine Sea. A second long term goal is to measure the horizontal directivity of the ambient noise. The short term variability useful for charcterizing the performance of a sonar system can be specified by the scattering function. This function specifies the spreading terms of how a signal randomly redistibutes itself in a range (travel time)--doppler plane. This redistribution can be calculated as the two dimensional convolution of the signal ambiguity function and the scattering function in the range ? doppler plane. [1] The first objective is to measure the scattering function in the Philippine Sea using the assets provided by the PhilSea_09 experiment. The scattering function changes in response to long term varying oceanographic conditions such as done by tomographic measurements. The second objective is to estimate the azimuthal directional noise using the FORA array during the execution of the PhilSea_09 experiment.