White Papers

Telemetry Re-Radiation System

January 01, 2008

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Abstract

Enclosed  weapon  bays  on  modern  aircraft  interfere  with  prelaunch,  Flight  Termination  System verification during training test launches.  Range safety personnel need to verify the functionality of  the  flight  termination  system  prior  to  missile  launch.    The  missile  telemetry  RF  is  highly  attenuated when the aircraft missile bay doors are closed, limiting the range for which the aircraft can fly during training flights.

TTC  and  Lockheed  Martin  designed  a  system  to  provide  telemetry data for these aircraft.  The system re-radiates the telemetry from the missiles with the weapon bay doors closed.  This paper describes the design considerations for this flexible system that accommodates multiple weapon systems in multiple weapon bay configurations. 

Introduction

This paper discusses the system trade studies and implementation of a system that radiates the Flight Termination System (FTS) ground signal to the missile system in an enclosed weapons bay while re-radiating the telemetry Radio Frequency (RF) signals for a closed loop FTS system verification prior to launch.

Challenges

Designing a Re-Radiation (Re-Rad) system with the multiple weapon system presented the following challenges to the design and implementation team:

  • Multiple weapon systems at varying data rates and modulation schemes
  • Avoid increasing the data error rates not to affect the overall link margin
  • Antenna location for best reception with the varying missile arrangements
  • Combining up to four RF/Data streams for transmission

Download the white paper to read more.

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