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         Accession Number
          005629653
         Author
          Lillard LN.  Evans HE II.  Spaulding JJ.
         Institution
          Ball Aerosp. & Technol. Corp., Fairborn, OH, USA.
         Title
          Minimum variance missile launch and impact estimation by
          fusing observations from multiple sensors.
         Source
          1997 IEEE Aerospace Conference. Proceedings (Cat.
          No.97CH36020). IEEE. Part vol.3, 1997, pp.309-20 vol.3. New
          York, NY, USA.
         Conference Information
          1997 IEEE Aerospace Conference. Snowmass at Aspen, CO, USA.
          IEEE Aerosp. & Electron. Syst. Soc. 1-8 Feb. 1997.
         Abstract
          Using minimum variance estimation techniques, we are
          developing a model-based, post-event missile trajectory and
          error analysis program called BOOSTR. The program's
          development has been motivated by a requirement to
          determine the errors in launch point estimates, and how
          these errors are affected by fusing data of various types
          from multiple sensors. BOOSTR's error analysis capabilities
          are being expanded to estimate errors in determining the
          missile's position at any point along the trajectory.
          Inputs to BOOSTR are any combination of range, azimuth,
          elevation, right ascension, declination, bistatic range, or
          bistatic range rate from any number of space-, air-, or
          ground-based sensors having random errors and biases. The
          program also requires models of the missile, atmosphere,
          and gravity to compute thrust, aerodynamic drag, and mass.
          BOOSTR iterates using minimum variance estimation equations
          to obtain best estimates of missile performance parameters,
          including launch time, launch latitude and longitude,
          launch height, launch azimuth, kick angle, burnout time,
          and sensor data biases. Not all parameters can necessarily
          be estimated; those which cannot must have a priori
          variances given to calculate their contribution to the
          errors. Output from BOOSTR includes a covariance matrix of
          the search variables which we transform into probability
          error ellipsoids for the position of the missile at any
          time from launch to impact. (21 References).
         Subject Headings
          Aerospace simulation.  Covariance matrices.  Error
          analysis.  Gaussian distribution.  Iterative methods.
          Least squares approximations.  Linearisation techniques.
          Military computing.  Missile guidance.  Modelling.
          Parameter estimation.  Position control.  Runge-Kutta
          methods.  Sensor fusion.  Target tracking.
         Key Phrase Identifiers
          minimum variance estimation techniques; missile launch and
          impact estimation; missile trajectory and error analysis;
          model-based post-event program; BOOSTR program; launch
          point estimates; multiple sensors; data fusing; bistatic
          range; random errors; thrust; aerodynamic drag; missile
          performance parameters; launch time; launch latitude;
          launch longitude; launch height; launch azimuth; kick
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          angle; optimal estimation; impact state vector; burnout
          time; trajectory simulation; nonlinear parameter
          estimation; sensor data biases; probability error
          ellipsoids; covariance matrix.
         Classification Codes
          Military control systems [C3375]; Aerospace engineering
          computing [C7460]; Aerospace control [C3360L]; Spatial
          variables control [C3120C]; Information theory [C1260];
          Digital signal processing [C5260]; Error analysis in
          numerical methods [C4110]; Interpolation and function
          approximation [C4130]; Military computing [C7150].
         Treatment
          Practical.  Theoretical or mathematical.  Experimental.
         Language
          English.
         ISBN
          0 7803 3741 7.
         Publication Type
          Conference Paper.
         Update Code
          199700.
         Copyright
          Copyright 1997, IEE.


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