Thursday, May 15

Satrack


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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