NASA Technical Reports Server (NTRS) : ILIAD pdf

NASA Technical Reports Server (NTRS) : ILIAD

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Description of the Book:

This report presents the results of a two-part project. The first part presents results of performance assessment tests on an Internet Library Information Assembly Data Base (ILIAD). It was found that ILLAD performed best when queries were short (one-to-three keywords), and were made up of rare, unambiguous words. In such cases as many as 64% of the typically 25 returned documents were found to be relevant. It was also found that a query format that was not so rigid with respect to spelling errors and punctuation marks would be more user-friendly. The second part of the report shows the design of a Kalman Filter for estimating motion parameters of a three dimensional object from sequences of noisy data derived from two-dimensional pictures. Given six measured deviation values represendng X, Y, Z, pitch, yaw, and roll, twelve parameters were estimated comprising the six deviations and their time rate of change.

Values for the state transiton matrix, the observation matrix, the system noise covariance matrix, and the observation noise covariance matrix were determined. A simple way of initilizing the error covariance matrix was pointed out

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 8/1/1996
• Year: 1996
• Book Topics/Themes: NASA Technical Reports Server (NTRS), INFORMATION SYSTEMS, PERFORMANCE TESTS, KALMAN FILTERS, DATA BASES, LIBRARIES, INTERNETS, THREE DIMENSIONAL BODIES, MATRICES (MATHEMATICS), RANDOM NOISE, ERROR ANALYSIS, Richardson, A. O

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