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Abstract

Abstract
In this paper we propose a blackboard approach to the coordination stage of a practical Mission Management System which is composed of three hierarchic levels: The organization level takes place off-line and produces a coherent set of subplanes permitting to achieve the mission goals in a desirable fashion. The resulting plan will be considered as a reference basis for future actions once the mission has started. As the mission develops, a blackboard based coordinating structure (in the intermediate hierarchic level) will adopt the adequate mission achievement and safety oriented behaviors as a response to continuously monitored mission state and detected internal and external events. The lowest level of the hierarchy consists in the execution units which perform the required behaviors.

Abstract
This paper examines a modified version of the instantaneous power spectrum (IPS). The short duration periodogram and the pseudo Wigner–Ville distribution (PWD) have been used extensively to display the time-varying spectral information. Disadvantages of the periodogram are its inherently poor resolution due to the requirement of matching the resolution width to the spectral dynamics of the signal. Potential problems associated with PWD are spectral cross terms and an inability to resolve spectral components at the endpoints of the analysis segment. A modified version of IPS is shown to be less sensitive to these types of problems. In addition, IPS can work with real valued signals sampled at the traditional Nyquist rate. © 1990 IEEE

Abstract