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Browsing by Subject "ISAR"

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Design and use of a mobile, x-band, high range resolution, radar research facility

Author: De Witt, JJ ; Alahmadi, MS ; Alzamil, A Date: Oct 2012 High range resolution (HRR) radar measurements can provide important feature information when performing non-cooperative target recognition. This paper presents a joint development of a mobile, X-band, HRR research radar facility, by the ... 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
Investigation of hopped frequency waveforms for range and velocity measurements of radar targets

Author: Kathree, U ; Nel, Willem AJ ; Van Rensburg, VJ ; Mishra, AK Date: Oct 2015 In the field of radar, High Range Resolution (HRR) profiles are often used to improve target tracking accuracy in range and to allow the radar system to produce an image of an object using techniques such as inverse synthetic aperture radar ... 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
Joint inference of dominant scatterer locations and motion parameters of an extended target in high range-resolution radar

Author: De Freitas, A ; De Villiers, Johan P ; Nel, Willem AJ Date: Jun 2015 A target of interest measured by a high range resolution radar may be modelled by multiple dominant points of reflections referred to as dominant scatterers. In this study a non-linear state space setting is used to model the states and ... Read more
Quality measures for HRR alignment based ISAR imaging algorithms

Author: Janse van Rensburg, V ; Mishra, A ; Nel, Willem AJ Date: May 2013 Some Inverse Synthetic Aperture Radar (ISAR) algorithms form the image in a two-step process of range alignment and phase conjugation. This paper discusses a comprehensive set of measures used to quantify the quality of range alignment, with ... 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
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
Using image quality measures and features to choose good images for classification of ISAR imagery

Author: Steyn, JM ; Nel, Willem AJ Date: Oct 2014 Most research efforts in ISAR focus on techniques to form the image via autofocus or on classification (assuming that the ISAR imagery is already generated). An important step between image formation and classification is to determine which ... Read more
Verification of the CADRCS RCS tool for NCTR work

Author: Botha, L Date: Mar 2007 This paper looks at the suitability of using the CADRCS RCS prediction tool for research into a class of NCTR work where the radar will give a high resolution output of the target, either a High Range Resolution (HRR) plot or Inverse Synthetic ... Read more

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Browsing by Subject "ISAR"

Browsing by Subject "ISAR"

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