Overview

Although jamming of radar's has been in vogue for nearly 50 years there appears to be no comprehensive report on the subject matter. The purpose of this research is to fill this gap. The methodology consisted of analysis, simulation, and where feasible experimental demonstrations. Experimental equipment consisted of a digital noise generator whose output was used to modulate a high frequency carrier in various fashions. The modulated output was fed into a very sensitive super-heterodyne receiver whose Intermediate frequency (IF) bandwidth could be varied from tens of Hz to mega Hz range. The detected output was displayed on a sampling oscilloscope. The display was in turn digitized and stored to make hard copies for documentation purposes. There was enough flexibility in the equipment to make a wide variety of observations. Experiments showed that the victim receiver should have sufficient bandwidth to fully respond to the jamming signal. In the case of pure tone jamming, IF bandwidth requirements were minimal and any increase beyond the minimum did not improve jamming effectiveness. In case of pseudo random analog or digital noise, increasing the shift register sequence length and clock frequency made it more difficult for the receiver to recover the jamming waveform and identification. This implied inability to devise quick countermeasures. As follow-on to this research, more precise experiments involving FM by noise and random pulses are suggested. 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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