http://hdl.handle.net/10204/453 Sun, 19 May 2013 06:56:44 GMT 2013-05-19T06:56:44Z http://hdl.handle.net/10204/6733 Title: Quality measures for HRR alignment based ISAR imaging algorithms Authors: Janse van Rensburg, V; Mishra, A; Nel, W Abstract: 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 the aim of 1) reviewing their benefits and shortcomings and 2) comparing their relative performance. Some quality measures may favour particular alignment techniques without adequately indicating improved alignment, so using multiple quality measures provide an added means of verifying the alignment quality achieved by any alignment technique. The sensitivity of the quality measures to slight misalignment of profiles and the effects of noise is also investigated. Description: IEEE Radar Conference 2013, Ottawa Canada, 29 April - 3 May 2013 Wed, 01 May 2013 00:00:00 GMT http://hdl.handle.net/10204/6733 2013-05-01T00:00:00Z http://hdl.handle.net/10204/6713 Title: Insights into factors contributing to the observability of a submarine at periscope depth by modern radar, Part 2: EM simulation of mast RCS in a realistic sea surface environment Authors: Smit, JC; Cilliers, JE Abstract: Recently, a set of high resolution radar measurements were undertaken in South Africa to gain insight into factors influencing the detectability of submarine masts deployed under realistic operational conditions. The measurements, processing results and some insights gained are described in. The current paper presents the results of a subsequent computational electromagnetic (CEM) simulation investigation of a simplified mast model in a realistic sea surface environment. The results illustrate some of the effects of the sea surface reflection interaction on the observed RCS of a submarine mast. Description: 2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), Cape Town 2-7 September 2012 Sat, 01 Sep 2012 00:00:00 GMT http://hdl.handle.net/10204/6713 2012-09-01T00:00:00Z http://hdl.handle.net/10204/6698 Title: Temporal logic motion planning in robotics Authors: Seotsanyana, M Abstract: Robotic computer systems have become increasingly ubiquitous in everyday life and this has led to a need to develop safe and reliable robot systems. Description: Copyright: 2012 CRC Press: Danvers, Massachusetts Wed, 01 Aug 2012 00:00:00 GMT http://hdl.handle.net/10204/6698 2012-08-01T00:00:00Z http://hdl.handle.net/10204/6696 Title: An advanced mutual-authentication algorithm using 3DES for smart card systems Authors: Tsague, HD; Nelwamondo, F; Msimang, N Abstract: One of the most commonly used two-factor user authentication mechanisms nowadays is based on smart card and personal identity number or password. A scheme of this type is usually known as, a smart card based password authentication. The core feature of such a scheme is to enforce two-factor authentication in the sense that, the client must have the smart card and know the card PIN number in order to gain access to the server. In this paper, we propose and advanced remote mutual authentication scheme between a smart card, a smart card reader and the backend server database to ensure system security integrity. Our scheme provides high security and mutual authentication at a reasonable computational cost. Furthermore, it restricts most of the current attack mechanisms. It is simple and can be adapted to any kind of lightweight devices. Description: 2nd International Conference on Cloud and Green Computing (CGC 2012), Xiangtan, Hunan, China, 1-3 November 2012. To be published in IEEE Xpolre. Thu, 01 Nov 2012 00:00:00 GMT http://hdl.handle.net/10204/6696 2012-11-01T00:00:00Z