Abstract
The origin of the missile can be traced
back to the roman war machine the catapult. The guided missile was born when
Werner Von Siemens suggested a guide torpedo for submarines in the late 19th
century. From these beginnings the present day trident and tomahawk are guided
from the skies using the GPS signals. This seminar deals with the measurement
concept that tests the missile accuracy. SATRACK receives, rebroadcast, records
and tracks the satellite signals sent by the GPS signals.
Satrack Concept
Guidance
system evaluation concept of very early weapons systems depended on the impact
scoring techniques. This means that the missile was shot and the accuracy was
formulated on the scoring or the target destruction. This evaluation method was
unacceptable for evaluating the more precise requirements of the latest
systems.
Portable Ground Equipment
This hardware is used
for the post flight processing and tracking of the satellite signals. The
SATRACK facility processes the raw data into a time series of range and Doppler
measurements for each satellite, and the Kalman filter, which incorporates
various corrections and generates a navigation solution for the missile. The
system has undergone a lot of redesign and development as the requirements
evolved with new type of translators and receivers. The latest system processes
the wideband L1/L2 signals dual frequency P-code as required by wide band
translators. The system hardware is based on Analog Device SHARC processor.
Most of the custom GPS processing hardware is based on field programmable gate
arrays [FPGA]. Each board has the ability to track up to eight channels.
Introduction
According to the
dictionary guidance is the ‘process of guiding the path of an object towards a
given point, which in general may be moving’. The process of guidance is based
on the position and velocity if the target relative to the guided object. The
present day ballistic missiles are all guided using the global positioning
system or GPS.GPS uses satellites as instruments for sending signals to the
missile during flight and to guide it to the target. SATRACK is a system that
was developed to provide an evaluation methodology for the guidance system of
the ballistic missiles. This was developed as a comprehensive test and evaluation
program to validate the integrated weapons system design for nuclear powered
submarines launched ballistic missiles.this is based on the tracking signals
received at the missile from the GPS satellites.
Conclusion
SATRACK is a
significant contributor to the successful development of and operational
success of the trident weapons system. It provides a unique monitoring function
that is critical to the maintenance of strategic weapons systems. The
development and research leading up to this technology has been instrumental in
bringing out the latest in GPS receiver, translators, data recorders
etc.several special test have been conducted with various combinations of inertial
systems, GPS receivers, translators as well as RF/antenna designs.
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