Probability of direction indications for two unresolved signals
Abstract
A directionfinding (DF) antenna (or an antenna array) with a beam shape which is aproximated by a cosine or a sine function is analyzed. The analysis applies to both peaktype and notchtype DF patterns for signals arriving from two fixed directions separated by less than the antenna beamwidths. It is shown that the statistical distribution of the direction indications depends on the signal parameters and also on the shape of the antenna radiation pattern. A probability density function is found for the direction indications for two unresolved cochannel signals present under Rayleigh fading conditions. Direction finding situations are simulated computer programs and comparisons are made beween the analytical and the simulation results.
 Publication:

IEE Proceedings F: Communications Radar and Signal Processing
 Pub Date:
 April 1985
 Bibcode:
 1985IPCRS.132...90A
 Keywords:

 Antenna Arrays;
 Direction Finding;
 Probability Theory;
 Radio Antennas;
 Radio Direction Finders;
 Signal Detection;
 Antenna Radiation Patterns;
 Computerized Simulation;
 Probability Density Functions;
 Rayleigh Distribution;
 Signal Fading;
 Systems Simulation;
 Communications and Radar