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<p>In this thesis, a data fusion problem when a number of different types of sensors  are deployed in the vicinity of a ballistic missile launch is studied. An objective of this  thesis is to calculate a scoring function for each sensor track, and the track file with the  best (optimum) track score can then be used for guiding an interceptor to the threat within  the boost phase. Seven active ground-based radars, two space-based passive infrared  sensors and two active light detection and ranging (LIDAR) sensors are used to track the  ballistic missile in the boost phase. Each space-based platform carries one passive  infrared sensor and one LIDAR. For the threat scenario, an IMPULSE intercontinental  ballistic missile model is used to create the trajectory of a generic ballistic threat. The  IMPULSE model is developed by the National Air and Space Intelligence Center to  provide an accurate representation of ballistic missiles. Each sensor provides a track of  the missile in the boost phase by using a multiple hypotheses tracking algorithm with an  extended Kalman filter. The calculation of the track scoring function is to identify the  sensor with the best track file. A track score is calculated for each sensor based on the  kinematics of the missile flight parameters and the signal-to-noise ratio at the sensor. By  using likelihood ratios, the optimum track file of the threat can then be determined and  the corresponding track file can be transmitted to the battle manager control in order to  lead the interceptor vehicle against the threat using the track file with the best score.  Using the optimum track file scoring signal processing techniques developed in this  thesis, the best track file can be sent to the interceptor to destroy the ballistic threat. This  leads to a faster response management where the threat can be destroyed inside the  territory of the country which launched the threat before any countermeasures are  deployed.
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<br>Subjects: Electrical engineering; Guided missiles; Tracking; Optical radar</div>
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Patsikas, Dimitrios</div>
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