摘要:

AbstractA new BIBO‐type stability criterion is proven for linear systems described by partial differential operators with constant coefficients. The class of inputs contains functions which are step‐like in time and which decay appropriately in the space variables. On the basis of this result, a frequency domain synthesis procedure was developed leading to an ‘economic’ feedback loop (i.e. significant noise reduction achieved). The procedure is illustrated by means of an

ISSN:0890-6327    

DOI:10.1002/acs.4480040402

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractA new approach for algorithms of linearly constrained adaptive array processing is developed in this paper. The new algorithm is the product of an effort to provide a more efficient procedure for real‐time implementation of adaptive array processing. The essence of our approach is to improve the efficiency by utilizing a number of processors updating the same array element. A delay is introduced in the computation for each processor. The structure (delay and multiprocessors) of our algorithm requires all processors to operate asynchronously and in a pipeline manner so that the recursively computed data flow in a rhythmic fashion, passing through each processor periodically. The almost sure convergence of the algorithm is proved under the assumption of non‐stationary and correlated sign

ISSN:0890-6327    

DOI:10.1002/acs.4480040403

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractTo implement the Bayes estimation in a recursive manner means to cope with the need for storing a too large data statistic. We prove here that under certain assumptions, it is possible to construct a reduced description of posterior densities (a reduced statistic) which is closed with respect to the Bayes rule. Thus theoptimal Bayes inferencecan be realized in terms of transitions between equivalence classes of densities matching the respective values of the description. Next we attempt to design a specificapproximationof the recursive Bayes estimation by projecting the true posterior density orthogonally, along the appropriate equivalence class, onto a prespecified approximation family. We find that to ensure orthogonal projection globally, the approximation family must be of a mixture type and the description vector determined by the values of the Kullback‐Leibler distance between the ‘base’ densities of the mixture approximation family and the true density. A simple simulation example compares the Bayes‐closed approximation with some competitive

ISSN:0890-6327    

DOI:10.1002/acs.4480040404

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractConventional autopilots for remotely operated underwater vehicles (ROVs) are difficult to design because the vessels' dynamics are strongly coupled, significantly non‐linear and vary according to the operating configuration. In addition, the derivation of the open‐loop dynamics requires the use of expensive, specialized testing equipment and is prone to error. A solution is to implement adaptive controllers. Three such schemes are presented here: the first two use a robust control law based on a simplified model of the open‐loop dynamics and off‐ and on‐line identification, while the third is an implicit linear quadratic on‐line adaptive controller. These controllers are evaluated by examining their performance when controlling a comprehensive non‐linear ROV simulation. The navigational hardware needed to realize an adaptive ROV auotopilot is a

ISSN:0890-6327    

DOI:10.1002/acs.4480040405

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractThe paper describes new self‐tuning algorithms for two‐dimensional signal processing. Specifically, extended algorithms are developed for filtering, smoothing and prediction of two‐dimensional data fields. These algorithms provide a transfer function approach to the problems of smoothing and prediction in two‐dimensional space witharbitrarylag and lead. As such, the fully two‐dimensional self‐tuning smoother and predictor derived in this paper represent an important generalization of the previous work which concerned prediction and filtering with arbitrary lead/lag on the current line. The generalization is in two parts. The first concerns the formal extension of the theory. The second concerns the development of efficient algorithms for calculation of the extended predictors and filters, with special attention being paid to the approximations required in order to realize the

ISSN:0890-6327    

DOI:10.1002/acs.4480040406

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

ISSN:0890-6327    

DOI:10.1002/acs.4480040408

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

ISSN:0890-6327    

DOI:10.1002/acs.4480040410

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

ISSN:0890-6327    

DOI:10.1002/acs.4480040401

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY