Diseño y construcción de un sistema digital avanzado de comunicaciones en HF.

Abstract

HP communications (3-30 MHz) have not been object of research during the 60s and lOs. Scientific community was devoted to satellite systems, due to its higher efficiency and betier channel performance. At te begñxning of te 80's, progress lii anti-satellite activity made military forces understand that satellite systems could be put out of service by un enemy action in a very easy way. As a result of that, current NATO interests seem to be a bybrid HF/satellite Li ibis article, a new Advanced Digital HF Communications System is presented. It communication system, uses Spread Spectrum techniques, sbowing robustness against multipath interference and low probability of in Física de la Tierra 363 2000, 12, 363-389 J. M. Andájar y J. L. Pijoan Diseño y construcción de un sistema digital avanzado... terception. The system is based on a DSP-platform able to implemení any kind of communication scheme and it has also been designed to measure sorne interesting channel parameíers, such as time delay spread and Doppler bandwidth.