Accession Number : ADP006880

Title :   Optimum Antenna Spacing for Diversity in Meteor Burst Communications Systems,

Corporate Author : ROYAL AEROSPACE ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)

Personal Author(s) : Cannon, Paul S. ; Shula, Anil K. ; Lester, Mark

Report Date : JUN 1991

Pagination or Media Count : 13

Abstract : Temperate latitude meteor burst (MB) space diversity measurements, using cross correlation analysis of 37 MHz signals scattered over an 800 km path, are reported. Signals of duration >0.75 s, received on antennas separated by 5 Lambda, 10 Lambda and 20 lambda, are investigated using 6 days of data collected over a 9-day period during February 1990. Signal decorrelation is shown to be achieved by an antenna separation of 5 Lambda and there is no apparent variation in average cross correlation coefficient, for antenna separations between 5 Lambda and 20 Lambda for any of the signal categories examined. We discuss in some detail previous diversity studies by Bartholome 1 and Ladd 2.

Descriptors :   *ANTENNAS, *RADIO COUNTERMEASURES, *COMMUNICATION AND RADIO SYSTEMS, COEFFICIENTS, CORRELATION, CROSS CORRELATION, DAY, LATITUDE, MEASUREMENT, PATHS, SEPARATION, SIGNALS, VARIATIONS, SIGNAL PROCESSING, IONIZATION TRAILS, RADIO WAVES, ELECTROMAGNETIC WAVE PROPAGATION, NOISE(RADIO), REPRINTS, SYMPOSIA.

Subject Categories : Radio Communications
      Radio Countermeasures
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE