Simple gain probability functions for large reflector antennas of JPL/NASA

Abstract

81 8-354-2674 Abstract - Simple models for the patterns as well as their cumulative gain probability and probability density functions of the JPUNASA Deep Space Network (DSN) antennas are developed. These a~ needed for the study and evaluation of interference from unwanted sources such as the emerging terrestrial system, High Density Fixed Service (HDFS), with the Ka-band receiving antenna systems in Goldstone Station of the JPLNASA Deep Space Network. Several different models for the high gain ground antennas of the JPUNASA Deep Space Network @SN) are considered. The model definitions are then used to evaluate cumulative probability functions and probability density functions for the gain values at a receiving antenna randomly located anywhere in the far field of the model antenna. Both two-dimensional models which simulate the pattern in a plane cut through the boresight of the antenna and the range of the angle from boresight to *180 degrees and three- dimensional ones in which the pattem is given anywhere in the half-space above the ground, with the range of angle from zero at boresight to 90 degrees are considered. In both cases, regular as well as smooth interpolated models have been developed. The gain value as seen by a receiver at a random location and exposed to the radiation from a transmitting antenna with a given gain profile, can be thought of as a uniformly distributed random variable. Formulas are derived and various plots are presented for the gain models and their associated cumulative probability functions and probability density functions.