Accession Number:

ADP006190

Title:

Pattern Recognition Techniques Applied to the NASA-ACTS Order-Wire Problem,

Descriptive Note:

Corporate Author:

NATIONAL TELECOMMUNICATIONS AND INFORMATION ADMINISTRATION BOULDER CO INST FO R TELECOMMUNICATION SCIENCES

Personal Author(s):

Report Date:

1989-09-01

Pagination or Media Count:

11.0

Abstract:

The National Aeronautics and Space Administration NASA is planning to launch an Advanced Communication Technology Satellite ACTS. This satellite will use several methods to adaptively mitigate the effects of fading due to rain in its 20- and 30-GHz links. A decision algorithm is needed to control the implementation of these mitigating techniques. The use of a learning pattern recognition algorithm as the solution to this problem is explored here. The algorithm is applied to data simulating fading on a slant path through the atmosphere at 20 and 28.8 GHz. The data were scaled from data measured on a 1-km path at 28.8 GHz in Hilo, Hawaii. The sole cause of fading in the data was attenuation due to rainfall on the path. The results indicate, at least for the test data, that the use of the most recently measured value of the received signal level RSL, is adequate for predicting the future RSL and can be used to decide when the mitigating techniques should be used. More complicated algorithms based on linear combinations of previous RSL samples do not perform significantly better than the simple previous value approach.

Subject Categories:

  • Radiofrequency Wave Propagation
  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE