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An adaptive dynamic surface control(DSC) strategy, combined with RBF neural network technology, is presented for the altitude subsystem of hypersonic flight vehicles. A performance function has been used, so that the altitude tracking error enters a pre-set range. Through the use of minimal learning techniques, the computational burden is drastically reduced. It has been proved that the closed-loop...
The electromagnetic scattering from the composite model of a three-dimensional (3-D) dielectric object located above a two-dimensional (2-D) dielectric rough surface is analyzed in this work. The 3DMLUV has been successfully applied in the scattering of PEC targets, however, when the object or rough surface become dielectric, the coupling between dielectric object and dielectric rough surface will...
In this paper, PO solution of electromagnetic scattering of anisotropic coating target under point source excitation has been derived. Firstly, According to the tangent plane approximation in the PO field, the high frequency scattering problems of point source excitation infinite plane model coated anisotropic medium can be solved specifically. Secondly, we can expand any scattering wave field including...
The high-frequency scattering of an electrically large target can be well approximated as a sum of response from individual scattering centers. The scattering center model can provide a concise and physically relevant description of the target radar signature. We use the attribute scattering center model to represent the targets' high frequency back scattering. In this model, the backscattered field...
An adaptive dynamic surface control scheme is proposed for a class of longitudinal dynamics of a hypersonic flight vehicle with unknown input nonlinearity, which comprises dead-zones and sector nonlinearities. The dynamic inversion velocity controller and the dynamic surface attitude controller are proposed, the difficulty caused by the input nonlinear has been overcome. The uncertain nonlinear functions...
Dynamic surface control scheme combined with a nonlinear disturbance observer technique is investigated for application to a class of generic hypersonic fight vehicles (HFVs) with parametric uncertainties and external disturbance. The proposed scheme possesses the following significant advantages: 1) A nonlinear disturbance observer-based approach enhances the system's disturbance attenuation ability...
In this paper, we present a parallel implementation of the Multilevel Characteristic Basis Function Method (MLCBFM) for the analysis of the scattering from electrically large rough surfaces. The Multilevel Characteristic Basis Function method is a natural extension of the conventional mono-level CBFM, which addresses the issues of high computation burden and memory requirement associated with this...
This paper outlines the research status and the key technique of flexible amphibious aircraft. And the dynamic model, control methods and multi-mode switching control are also introduced. As well as a design concept is proposed for the amphibious flexible aircraft witch can perform tasks under two both certain environment in the air and underwater. Finally some of the problems and difficulties in...
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