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Browsing by Author "Abdul Gaffar, MY"

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Analysis of high resolution land clutter using an X-band radar

Author: Melebari, A ; Abdul Gaffar, MY ; Strydom, JJ Date: Oct 2015 In modern radar systems with high range resolution, the statistical properties of clutter have a significant effect on the performance of the radar. Analyzing the radar returns from various clutter terrains is essential when aiming to optimize ... Read more
Comparison of square law, linear and bessel detectors for CA and OS CFAR algorithms

Author: Melebari, A ; Mishra, AK ; Abdul Gaffar, MY Date: Oct 2015 A major challenge in radar detection is to optimize both the detection performance and computation cost. In Constant False Alarm Rate (CFAR) algorithms, different detectors can be implemented like linear, square law or Bessel detectors. These ... Read more
Detecting 3-D rotational motion and extracting target information from the principal component analysis of scatterer range histories

Author: Nel, Willem AJ ; Stanton, D ; Abdul Gaffar, MY Date: Oct 2009 ISAR imagery of ships are complicated by the 3-D motion of the target, which causes blurring in the imagery. A technique is proposed which could help detect such motion and prove useful to both analyse the 3-D motion as well as possibly help ... Read more
The effect of windowing on the performance of the CA-CFAR and OS-CFAR algorithms

Author: Melebari, A ; Melebari, A ; Alomar, W ; Abdul Gaffar, MY ; De Wind, R ; Cilliers, Jacques E Date: Oct 2015 A major challenge in radar design is to not overflow the processor with false detections. This paper investigates the performance of Constant False Alarm Rate (CFAR) algorithms on maintaining a fixed false alarm rate when windowing is used ... Read more
Investigating the effect of a targets time-varying doppler generating axis of rotation on isar image distortion

Author: Abdul Gaffar, MY ; Nel, Willem AJ Date: Oct 2007 ISAR imaging has potential in assisting with the classification of non-cooperative targets. Blurred ISAR imagery may however lead to misleading classification results. Much research has been done to understand some of the causes of distortion ... Read more
Investigation of 3-D RCS Image formation of ships using ISAR

Author: Lord, RT ; Nel, Willem AJ ; Abdul Gaffar, MY Date: May 2006 Conventional Inverse Synthetic Aperture Radar (ISAR) utilises the rotational motion of a target such as a ship or an aircraft to obtain a 2-D image of the target’s radar cross section (RCS) profile from a coherent radar system. This concept ... Read more
ISAR imaging using the instantaneous range instantaneous Doppler method

Author: Wazna, TM ; Balamesh, AS ; Abdul Gaffar, MY Date: Oct 2015 In Inverse Synthetic Aperture Radar (ISAR) imaging, the Range Instantaneous Doppler (RID) method is used to compensate for the nonuniform rotational motion of the target that degrades the Doppler resolution of the ISAR image. The Instantaneous ... Read more
Probability of helicopter blade flash interception in search radar

Author: Berndt, Robert J ; Nel, Willem AJ ; Abdul Gaffar, MY ; O’Hagan, D Date: Dec 2021 Helicopter main rotor blade flashes in radar measurements are an oft-used feature for target classification. While focus is often placed on being able to detect them, little attention has been given to what is required to ensure that they are ... Read more
Quaternion-based transformation for extraction of image-generating Doppler for ISAR

Author: Abdul Gaffar, MY ; Nel, Willem AJ ; Inggs, MR Date: Oct 2008 Inverse synthetic aperture radar (ISAR) is an imaging technique that is dependent on an object’s rotational motion over a coherent processing interval. Maritime vessels and aircraft possess 3-D rotational motion, whereas it is only their ISAR ... Read more
Selecting suitable coherent processing time window lengths for ground-based ISAR imaging of cooperative sea vessels

Author: Abdul Gaffar, MY ; Nel, Willem AJ ; Inggs, MR Date: Sep 2009 Inverse synthetic aperture radar (ISAR) imaging of sea vessels is a challenging task because their 3-D rotational motion over the coherent processing interval (CPI) often leads to blurred images. The selection of the duration of the CPI, also ... Read more
Synthetic range profiling, ISAR imaging of sea vessels and feature extraction, using a multimode radar to classify targets: initial results from field trials

Author: Abdul Gaffar, MY ; Nel, Willem AJ ; Naicker, K ; Steyn, J ; Alanazi, T ; Alzamil, A Date: Apr 2011 This paper describes the design and working principles of an experimental multimode radar with a stepped-frequency Synthetic Range Profiling (SRP) and Inverse Synthetic Aperture Radar (ISAR) capability for the purpose of operator-based ... Read more
A time domain phase-gradient based ISAR autofocus algorithm

Author: Nel, Willem AJ ; Giusti, E ; Martorella, M ; Abdul Gaffar, MY Date: Oct 2011 Autofocus is a well known required step in ISAR (and SAR) processing to compensate translational motion. This research proposes a time domain autofocus algorithm and discusses its relation to the well known phase gradient autofocus (PGA) ... Read more
Towards Inverse Synthetic Aperture Radar (ISAR) for small sea vessels

Author: Abdul Gaffar, MY Date: Dec 2006 Power point presentation on Inverse Synthetic Aperture Radar (ISAR) Read more

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Browsing by Author "Abdul Gaffar, MY"

Browsing by Author "Abdul Gaffar, MY"

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