Faculty Advisor

Bitar, Stephen John

Faculty Advisor

Looft, Fred J.

Project Center

Goddard Space Flight Center


The purpose of this project was to update an existing ST5 Simulink Radio Frequency (RF) Communications model to provide more accurate line of sight predictions for long term mission planning. The ST5 satellite consists of two omni directional antennas mounted in opposition to each other resulting in an area of overlapping antenna patterns. The composite RF transmission pattern exhibits a marked zone of destructive phase interference. This area is referred to as the Zone of Interference (ZOI) which results in insufficient link margins for reception. The modified RF model calculates the link margin taking into account the radiative pattern as a function of satellite attitude and a new orbit propagator will be utilized which is capable of maintaining accuracy for up to three months to aid in long-term mission planning. Finally, the output of the Simulink model provides black out dates and times for long term planning.


Worcester Polytechnic Institute

Date Accepted

October 2004


Electrical and Computer Engineering


Electrical Engineering

Project Type

Major Qualifying Project



Advisor Department

Electrical and Computer Engineering