Estimating the angle of arrival (AOA) of a high frequency (HF) signal, 2- 2 MHz, is challenging, especially if the antenna array is installed on a platform with dimensions on the order of one wavelength. Accurate AOA estimates are necessary for search and rescue operations and geolocating RF emitters of interest. This research examines the performance of a direction finding (DF) system using structurally ntegrated (SI) antennas installed on an airborne platform which allows the aircraft structure to become the receiving ...
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Estimating the angle of arrival (AOA) of a high frequency (HF) signal, 2- 2 MHz, is challenging, especially if the antenna array is installed on a platform with dimensions on the order of one wavelength. Accurate AOA estimates are necessary for search and rescue operations and geolocating RF emitters of interest. This research examines the performance of a direction finding (DF) system using structurally ntegrated (SI) antennas installed on an airborne platform which allows the aircraft structure to become the receiving element. Two simulated DF systems are analyzed at 4 and 11 MHz. The relationship between the number of SI antennas used and the AOA accuracy is examined by simulating systems using 4, 8, and 16 antennas. Simulations are also performed using the SI array to synthesize the pattern of a 3-loop cube, or vector, antenna. The maximum likelihood algorithm is used to produce AOA estimates. An array of SI antennas, with a dedicated receiver channel for each antenna, produce more accurate AOA estimates at 11 MHz than at 4 MHz. The accuracy improves when more antennas are included, regardless of frequency. Synthesizing a pattern to perform AOA estimation is an unnecessary step resulting in a suboptimal array for HFDF purposes. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
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New. Trade paperback (US). Glued binding. 130 p. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.
