A fast adaptive recursive filtering algorithm is proposed. The algorithm is based on the minimization of the cumulative error squares cost function iteratively using the steepest descent gradient technique. This algorithm exhibits a higher convergence rate and less sensitivity to the dispersions of the input± output observations than the well-known LMS algorithm. Moreover, the proposed algorithm requires only the same computational complexity as the LMS algorithm.
A proposal of an adaptive closed loop system for tracking the aircraft during the approach and landing maneuver is presented. The aircraft path is measured by the MLS integrated with the GPS systems. However, the measured path is combined with additional noise or interference signals that degrade the system performance. Then, the aircraft path should be estimated from noisy observations. In this paper, an adaptive filtering algorithm is applied rather than the Kalman filter to obtain an optimal estimate of the aircraft path to control the aircraft actuators. The adaptive filter coefficients are updated according to the least mean square adaptation algorithm. The performance of the proposed scheme is evaluated through the computer simulation during the lateral and longitudinal aircraft motion. It is concluded that the proposed scheme exhibits high convergence and tracking rates. Also, the proposed scheme produces small fluctuations during the aircraft tracking of an assigned reference path.
The interference cancellation using adaptive antenna arrays is the objective of this paper. A proposal for an adaptive antenna array is prcseiited in this paper where the number of antenna sensors is minimized. The performances of both the proposed scheme and the ordinary one are compared through computer simulations. The effects ofthe number of array elements, and interference to signal ratio (ISR) on the performance of the adaptive interference canceller is evaluated. It is found that the proposed scheme of the adaptive antenna array exhibits better performance than the ordinary adaptive antenna array.
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