Array shape determination with a real-time model
A shape estimation scheme based on precomputed frequency-domain solutions of array motion is presented. The boundary conditions supporting each solution are discrete Fourier transform (OFT) components of sensor measurements, which are updated in real time. A prediction of array shape in the time domain is obtained by performing an inverse OFT on the set of frequency-domain solutions. Extensions to the method include the use of slope inputs instead of displacements as well as inclusion of an arbitrary number of inputs to minimize the effect of measurement error. A comparison of the results with data shows good agreement, and CPU time is an order of magnitude faster than real time on the VAX 8800 (with an update rate of 0.74 sec).
SourceIn: Low frequency active sonar (SACLANTCEN Conference Proceedings CP-42), vol. 2, 1993, pp. G/22-1 - G/22-7.
Ruffa, A. A.