Main Page
Deanship
The Dean
Dean's Word
Curriculum Vitae
Contact the Dean
Vision and Mission
Organizational Structure
Vice- Deanship
Vice- Dean
KAU Graduate Studies
Research Services & Courses
Research Services Unit
Important Research for Society
Deanship's Services
FAQs
Research
Staff Directory
Files
Favorite Websites
Deanship Access Map
Graduate Studies Awards
Deanship's Staff
Staff Directory
Files
Researches
Contact us
عربي
English
About
Admission
Academic
Research and Innovations
University Life
E-Services
Search
Deanship of Graduate Studies
Document Details
Document Type
:
Thesis
Document Title
:
ISAR IMAGING OF SMALL MARINE TARGETS USING JOINT TIME-FREQUENCY TRANSFORMS
مصاورة رادار الفوهة المُركبة العكسي للأهداف البحرية الصغيرة باستخدام التحويلات الزمنية-الترددية المشتركة
Subject
:
Faculty of Engineering - Department of Electrical and Computer Engineering
Document Language
:
Arabic
Abstract
:
Inverse Synthetic Aperture Radar (ISAR) imaging is the process of resolving a set of the target complex valued radar illuminations into a high resolution 2D target image. The target motion is composed of: translational and rotational motions. Rang Alignment is used to align successive received target echoes to limit the motion information of the target into only that of the rotational motion. If the rotation is with constant angular velocity, then the Fourier transform along the cross-range, Doppler, dimension will result in a high resolution image. However, small marine targets are characterized by their complex and unpredicted rotational motion which will degrade the Doppler resolution by introducing high order differential terms to the phase information of the target. Range Instantaneous Doppler (RID) imaging, rather than Range Doppler, is used to compensate these phase errors using Joint Time-Frequency Transforms (JTFTs). In this thesis, the Wavelet Fit algorithm is proposed as a range alignment algorithm and is perceived after detailed discussion of the aligning errors that induce when using envelope similarity range alignment methods. The Wavelet Fit algorithm is implemented on measured data and is compared with the Global Rang Alignment algorithm, and the correlation algorithm. The compared algorithms performed numerically close, where the Wavelet Fit algorithm had competitive performance and visual advantage. RID imaging is discussed after the introduction of JTFTs, beginning from the STFT, and ending by the S-distribution. The challenge of utilizing the S-distribution as an RID imaging technique is encountered by developing the Modified S-method (MS-method), which is discussed and applied on modeled; simulated; and measured data. The validity of the MS-method was indicated by outputting high-resolution images.
Supervisor
:
Dr. Ahmed Balamesh
Thesis Type
:
Master Thesis
Publishing Year
:
1434 AH
2013 AD
Added Date
:
Saturday, March 30, 2013
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
طارق محمد وزنـه
WAZNA, TARIQ MOHAMED
Researcher
Master
Files
File Name
Type
Description
35343.pdf
pdf
Back To Researches Page