Absfruct-Lattice structures are developed for the realization of M -input p-output discrete-time all-pass transfer matrices H(z), given in the form of a right matrix-fraction description (MFD): H(r) = N(z) D’ (z). The procedure is based on the generation of a sequence of all pass matrices of successively decreasing order, by matrix LBR two-pair extraction. Two cases are distinguished: the first...

This paper revisits the problem of mixed 2 filtering for polytopic discrete-time systems. Differing from previous results in the quadratic framework, the filter design makes full use of the parameter-dependent stability idea: Not only is the filter dependent of the parameters (which are assumed to reside in a polytope and be measurable online), but in addition, the Lyapunov matrices are differe...

the grace mission has provided scientific community time-variable gravity field solutions with high precision and on a global scale. the grace mission was launched on march 2003. this mission consists of two satellites that pursue each other in their orbit. distance between two satellites in orbit is measured continuously to an accuracy of better than 1 micron using kbr system placed in satelli...

‎in this paper‎, ‎the notion of the radical of a filter in‎ ‎residuated lattices is defined and several characterizations of‎ ‎the radical of a filter are given‎. ‎we show that if f is a‎ ‎positive implicative filter (or obstinate filter)‎, ‎then‎ ‎rad(f)=f‎. ‎we proved the extension theorem for radical of filters in residuated lattices‎. ‎also‎, ‎we study the radical‎ ‎of filters in linearly o...

Carrier-phase Di®erential GPS is an ideal sensor for formation °ying missions in low Earth orbit since it provides a direct measure of the relative positions and velocities of the vehicles in the °eet. This paper presents results for a relative navigation ̄lter that achieves centimeter-level precision using measurements from a customized GPS receiver. This work uses a precise, robust extended K...

Among the science investigations that are of interest in the NASA Space Science, Earth Science and Planetary Science disciplines are data for surface elevation information, atmosphere chemical composition, atmosphere dynamics and meteorology. A laser sensor architecture has been developed at ITT using both internal and IIP funds which is capable of addressing these science data needs. This arch...

in this paper, we proposed a novel structure for designing all optical filter based on photonic crystal structure. in designing the proposed filter, we simply employed a point defect localized between input and output waveguides as wavelength selecting part of the filter. the initial form of this filter is capable of selecting optical waves at =1560 nm, the transmission efficiency of the filte...

Geophysical processes which excite variations in the orientation of the Earth have an irregular nature therefore a stochastic approach to the description of Earth rotation seems to be the most appropriate. We describe here a simple stochastic model for the Chandler wobble, originally proposed by Jeereys (1940), then prove its advantage over the sinusoidal modeling by performing the goodness-of-...

Given that the supply of several rare earth elements (REEs) is sometimes limited, recycling REEs used in various advanced materials, such as Nd magnets, is important for realizing efficient use of REE resources. In the present work, the feasibility of using DNA for REE recovery and separation was examined, along with the identification of the binding site of REEs in DNA. In particular, a DNA-...

It is crucially important to estimate unknown parameters in process-based models by integrating observation and numerical simulation. For many applications earth system sciences, a parameter estimation method which allows temporally change required. In the present paper, an efficient practical time-varying of relatively low dimensional presented. newly proposed method, called Hybrid Offline Onl...