An Experimental Investigation of a Neyman-Pearson Detector for a Multichannel Active Sonar Operating in a Reverberant Environment.
Abstract
This report describes a study in which several aspects of the discrete time Neyman-Pearson detector are investigated using experimental acoustic data. The problem considered is that of detecting a known signal from an active sonar operating a reverberant environment. The noise background consists of sonar returns obtained by directing a transmitter and receiver toward the wind driven surface of a freshwater lake. Data for the known signal consist of echoes from a styrofoam sphere. Both signal and reverberation returns are digitized outputs from four elements of a linear receiving array. Two types of sonar transmissions employed are 1.0 msec pulsed continuous wave (cw) signal at a carrier frequency of 80 kHz and a 1.0 msec pulsed linear frequency modulated (LFM) signal with a 10 kHz sweep centered at 80 kHz. Signal-plus-noise events are created by adding digital samples from the styrofoam ball echoes to samples from the reverberation returns at specified signal-to-noise ratios. The reverberation process is assumed to be Gaussian with a known covariance matrix. For the experimental detector evaluation, this matrix is computed by averaging over an ensemble of approximately 100 reverberation events. This matrix is used in the Neyman-Pearson detector to process these same 100 returns. The performance obtained experimentally in this fashion is compared to that predicted from theoretical considerations based on the Gaussian assumption and the covariance matrix. Finally, the performance of the Neyman-Pearson detector is shown for these data to provide the following improvement over a simple matched filter.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 03, 1981
- Accession Number
- ADA100507
Entities
People
- Arthur J. Estes
Organizations
- University of Texas at Austin