Thesis-1992-Sun.pdf (4.8 MB)
Performance study of high resolution algorithms in sonar signal processing
thesis
posted on 2012-10-08, 13:55 authored by Chao SunIn the last two decades or so there has been great interest in the problem of estimating signal
parameters from the measurements at sensor array outputs. The most important parameters
are probably the directions-of-arrival (DOAs) at the array from radiating sources in the
observed spatial field. This thesis is devoted to the study of algorithms and techniques which
have been suggested from different points of view for the same direction estimation problem.
Several classes of algorithms are examined which include the conventional beamforming
methods, eigenstructure based algorithms, subspace rotation methods, decompositions
techniques, and the more recently proposed weighted subspace fitting methods.
The research in this thesis contains three main aspects addressing theoretical analyses,
computer simulations, and practical experiments respectively. A set of simulation programs
has been developed to evaluate the performance in various scenarios, and Monte Carlo tests
have been carried out to support theoretical analyses. The simulation work was carried out
on an IBM PC, and the computer language used was MATLAB (Matrix Laboratory), a
package especially developed for matrix computations. A sonar system available in the sonar research group at Loughborough University of
Technology (LUT) was modified and used to collect real data for off-line processing so as
to demonstrate the algorithm performance in real experimental environments. Two scenarios
were examined when the system worked in passive and active modes respectively. In the
passive working mode, two emitters were employed to give uncorrelated or strongly
correlated signals by using the same or different working frequencies. When working in the
active mode, a single sensor was placed on the top of the receiving array which received
reflections from two targets in the distance. The data was captured and then saved on floppy
disks from the measurement system and processed on PCs.
A large number of results are presented, analysed, and summarized in the thesis, including·
both computer simulations and practical measurements. This provides a fundamental ground
for further work in this and related areas.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Publisher
© Chao SunPublication date
1992Notes
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.Language
- en