Accession Number : ADA115080

Title :   DCS/ACC Pacific EW Survivability Study. Section III. Engineering Calculations.


PDF Url : ADA115080

Report Date : 27 Jul 1981

Pagination or Media Count : 89

Abstract : LOS, tropo, diffraction, and satellite links all experience signal variations as a function of time and RF signal patch length, commonly referred to as fading. Fading occurs when microwave signals arrive simultaneously at a receiving antenna over more than one path and result from the fact that at certain times these signals will be out of phase, cancelling each other. Fading is caused by a combination of climatic and terrain factors; therefore, it is difficult to predict the frequency and depth of fades that can occur over a given path. The discussions which follow delineate the methods used to predict the probability of a fade and the fade outage statistics which have a bearing on the performance of a particular link. The methods are derived for LOS, tropo, diffraction, and satellite links. In addition, failure thresholds for these types of links are discussed, which permit the calculation of required processing gain (antijam) for ECCM applications. Sample calculations are also provided for typical LOS, tropo, and satellite links.

Descriptors :   *Radiofrequency, *Microwaves, *Signal processing, *Gain, *Predictions, Engineering, Probability, Diffraction, Variations, Radio links, Computations, Survival(General), Electronic counter countermeasures, Terrain, Climate, Statistics, Failure

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE