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You searched for subject:(Radar countermeasures). Showing records 1 – 3 of 3 total matches.

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University of Pretoria

1. [No author]. A comprehensive investigation of retrodirective cross-eye jamming .

Degree: 2010, University of Pretoria

Cross-eye jamming is an Electronic Attack (EA) technique that induces an angular error in the radar being jammed. The main benefit of cross-eye jamming is that it is effective against monopulse tracking radars, which are largely immune to other forms of jamming. The objective of this research is to gain a complete understanding of cross-eye jamming so that systems that might be developed in future can be properly specied. The main contribution of this work is a comprehensive mathematical and experimental study of retrodirective cross-eye jamming. The mathematical analysis considers all aspects of an isolated, single-loop, retrodirective cross-eye jamming engagement, thereby avoiding the approximations inherent in other cross-eye jamming analyses. Laboratory experiments that accurately represent reality by using the radar for both transmission and reception, and simulating a true retrodirective cross-eye jammer were performed to validate the theoretical analysis. Lastly, the relationship between the angular error induced in the radar being jammed and the matching required from a cross-eye jammer system is explored. The most important conclusion of this work is that the traditional analyses of cross- eye jamming are inaccurate for the conditions under which cross-eye jammers operate. These inaccuracies mean that the traditional analyses are overly conservative, particularly at short ranges and for high cross-eye gains, suggesting that practical cross-eye jammers can be realised more easily than is generally believed. Advisors/Committee Members: Odendaal, J.W. (Johann Wilhelm) (advisor), Joubert, Johan (advisor).

Subjects/Keywords: And radar; Jamming; Radar position measurement; Radar measurements; Radar antennas; Radar tracking; Monopulse radar; Radar countermeasures; Electronic countermeasures; Electronic warfare; UCTD

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

author], [. (2010). A comprehensive investigation of retrodirective cross-eye jamming . (Doctoral Dissertation). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-06122010-215639/

Chicago Manual of Style (16th Edition):

author], [No. “A comprehensive investigation of retrodirective cross-eye jamming .” 2010. Doctoral Dissertation, University of Pretoria. Accessed December 01, 2020. http://upetd.up.ac.za/thesis/available/etd-06122010-215639/.

MLA Handbook (7th Edition):

author], [No. “A comprehensive investigation of retrodirective cross-eye jamming .” 2010. Web. 01 Dec 2020.

Vancouver:

author] [. A comprehensive investigation of retrodirective cross-eye jamming . [Internet] [Doctoral dissertation]. University of Pretoria; 2010. [cited 2020 Dec 01]. Available from: http://upetd.up.ac.za/thesis/available/etd-06122010-215639/.

Council of Science Editors:

author] [. A comprehensive investigation of retrodirective cross-eye jamming . [Doctoral Dissertation]. University of Pretoria; 2010. Available from: http://upetd.up.ac.za/thesis/available/etd-06122010-215639/


University of Pretoria

2. Du Plessis, W.P. (Warren Paul). A comprehensive investigation of retrodirective cross-eye jamming.

Degree: Electrical, Electronic and Computer Engineering, 2010, University of Pretoria

Cross-eye jamming is an Electronic Attack (EA) technique that induces an angular error in the radar being jammed. The main benefit of cross-eye jamming is that it is effective against monopulse tracking radars, which are largely immune to other forms of jamming. The objective of this research is to gain a complete understanding of cross-eye jamming so that systems that might be developed in future can be properly specied. The main contribution of this work is a comprehensive mathematical and experimental study of retrodirective cross-eye jamming. The mathematical analysis considers all aspects of an isolated, single-loop, retrodirective cross-eye jamming engagement, thereby avoiding the approximations inherent in other cross-eye jamming analyses. Laboratory experiments that accurately represent reality by using the radar for both transmission and reception, and simulating a true retrodirective cross-eye jammer were performed to validate the theoretical analysis. Lastly, the relationship between the angular error induced in the radar being jammed and the matching required from a cross-eye jammer system is explored. The most important conclusion of this work is that the traditional analyses of cross- eye jamming are inaccurate for the conditions under which cross-eye jammers operate. These inaccuracies mean that the traditional analyses are overly conservative, particularly at short ranges and for high cross-eye gains, suggesting that practical cross-eye jammers can be realised more easily than is generally believed. Advisors/Committee Members: Odendaal, J.W. (Johann Wilhelm) (advisor), Joubert, Johan (advisor).

Subjects/Keywords: And radar; Jamming; Radar position measurement; Radar measurements; Radar antennas; Radar tracking; Monopulse radar; Radar countermeasures; Electronic countermeasures; Electronic warfare; UCTD

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Du Plessis, W. P. (. P. (2010). A comprehensive investigation of retrodirective cross-eye jamming. (Doctoral Dissertation). University of Pretoria. Retrieved from http://hdl.handle.net/2263/25480

Chicago Manual of Style (16th Edition):

Du Plessis, W P (Warren Paul). “A comprehensive investigation of retrodirective cross-eye jamming.” 2010. Doctoral Dissertation, University of Pretoria. Accessed December 01, 2020. http://hdl.handle.net/2263/25480.

MLA Handbook (7th Edition):

Du Plessis, W P (Warren Paul). “A comprehensive investigation of retrodirective cross-eye jamming.” 2010. Web. 01 Dec 2020.

Vancouver:

Du Plessis WP(P. A comprehensive investigation of retrodirective cross-eye jamming. [Internet] [Doctoral dissertation]. University of Pretoria; 2010. [cited 2020 Dec 01]. Available from: http://hdl.handle.net/2263/25480.

Council of Science Editors:

Du Plessis WP(P. A comprehensive investigation of retrodirective cross-eye jamming. [Doctoral Dissertation]. University of Pretoria; 2010. Available from: http://hdl.handle.net/2263/25480


Georgia Tech

3. Wortham, Cody. Space-Time Processing for Ground Surveillance Radar.

Degree: MS, Electrical and Computer Engineering, 2007, Georgia Tech

As the size of an adaptive antenna array grows, the system is able to resist interference signals of increasing bandwidth. This is a result of the transmit pattern gain increasing, which raises the target's return power, and a greater number of degrees of freedom. However, once the interference signal decorrelates completely from one channel to the next, increasing array size will cease to improve detection capability. The use of tapped delay-line processing to improve correlation between channels has been studied for smaller arrays with single element antennas, but previous analyses have not considereded larger systems that are partitioned into subarrays. This thesis quantifies the effect that subarrays have on performance, as measured by the interference bandwidth that can be handled, and explains how tapped delay-line processing can maintain the ability to detect targets in an environment with high bandwidth interference. The analysis begins by deriving equations to estimate the half-power bandwidth of an array with no taps. Then we find that a single delay with optimal spacing is sufficient to completely restore performance if the interference angle is known exactly. However, in practice, the tap spacing will never be optimal because this angle will not be known exactly, so further consideration is given to this non-ideal case and possible solutions for arbitrary interference scenarios are presented. Simulations indicate that systems with multiple taps have more tolerance to increasing interference bandwidth and unknown directions of arrival. Finally, the tradeoffs between ideal and practical configurations are explained and suggestions are given for the design of real-world systems. Advisors/Committee Members: Lanterman, Aaron (Committee Chair), Barnes, Christopher (Committee Member), Williams, Doug (Committee Member).

Subjects/Keywords: Adaptive; Radar; Surveillance; Array; STAP; Countermeasures; Space-time; Jamming; ECM; Tapped-delay; ECCM; Surveillance radar; Antenna arrays; Adaptive signal processing; Adaptive antennas Computer simulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Wortham, C. (2007). Space-Time Processing for Ground Surveillance Radar. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/14468

Chicago Manual of Style (16th Edition):

Wortham, Cody. “Space-Time Processing for Ground Surveillance Radar.” 2007. Masters Thesis, Georgia Tech. Accessed December 01, 2020. http://hdl.handle.net/1853/14468.

MLA Handbook (7th Edition):

Wortham, Cody. “Space-Time Processing for Ground Surveillance Radar.” 2007. Web. 01 Dec 2020.

Vancouver:

Wortham C. Space-Time Processing for Ground Surveillance Radar. [Internet] [Masters thesis]. Georgia Tech; 2007. [cited 2020 Dec 01]. Available from: http://hdl.handle.net/1853/14468.

Council of Science Editors:

Wortham C. Space-Time Processing for Ground Surveillance Radar. [Masters Thesis]. Georgia Tech; 2007. Available from: http://hdl.handle.net/1853/14468

.