To improve detecting performance of gas concentration in coal-mine, a new linearization method of carrier catalytic gas sensor characteristics based on high-order polynomials was introduced. Firstly, the calibration d...
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This paper is concerned with the design and the synthesis of the impulsive positive observer (IPO) for positive linear continuous systems. The IPO can estimate the states for positive systems even when the measured ou...
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Bat algorithm is a novel swarm intelligent algorithm inspired by the echolocation behaviour of bats. Pulse rate of emission is one important parameter, which is adjusted in an exponential manner in the standard versio...
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In real applications,network resources are generally *** by the significance of optimizing network,the consensus centrality index is proposed to quantify how fast a leader could guide all the nodes in a network to rea...
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ISBN:
(纸本)9781479947249
In real applications,network resources are generally *** by the significance of optimizing network,the consensus centrality index is proposed to quantify how fast a leader could guide all the nodes in a network to reach the desired *** the basis of complex networks,the relation of the consensus centrality distribution and the degree distribution in several model and real networks is ***,the influence of network structure on consensus performance is *** the network becoming more heterogeneous or denser,the maximum consensus centrality *** faster convergence speed can be achieved if the node with the maximum consensus centrality is selected leader.
In order to further improve the overall disturbance rejection response when both input and output disturbances are taken into account, we present a design method based on the disturbance observer (DOB) control structu...
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A nuclear export signal (NES) is a sequence of amino acids, which is a protein localization signal, and contributes to regulate localization of cellular proteins. In recent peering works, activity of NESs were introdu...
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This paper deals with the robust adaptive fault-tolerant compensation control problem for steering subsystem of unmanned underwater vehicles(UUVs) with actuator time-varying faults, disturbances and parameter uncertai...
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ISBN:
(纸本)9781467374439
This paper deals with the robust adaptive fault-tolerant compensation control problem for steering subsystem of unmanned underwater vehicles(UUVs) with actuator time-varying faults, disturbances and parameter uncertainties. A sufficient condition for the existence of reduced-order sliding mode dynamics is derived in the case of actuator faults, and an explicit parametrization of the desired sliding surface is also given. Without the need for a fault detection and isolation(FDI) mechanism, an adaptive sliding mode controller is developed based on the online estimation of an eventual fault to maintain the sliding mode, where the gain of the nonlinear unit vector term is updated automatically to compensate the effects of actuator faults and exogenous disturbances. The simulation demonstrates the effectiveness of the proposed design method.
Different azimuth targets have different Doppler centroid and different time support domain in slide spotlight synthetic aperture radar. Thus, it is hard to weighting window on the echo in slide spotlight mode. This p...
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Different azimuth targets have different Doppler centroid and different time support domain in slide spotlight synthetic aperture radar. Thus, it is hard to weighting window on the echo in slide spotlight mode. This paper proposed an azimuth weighting method of slide spotlight SAR based on subaperture chirp scaling algorithm. Firstly, the subaperture number of the algorithm is discussed based on the shift of Doppler centroid and the pulse repetition frequency(PRF). Secondly, the range cell migration and the remove of the azimuth phase of each subaperture are processed by chirp scaling algorithm independently. At last, the data of each subaperture is combined together, and the azimuth weighting window is applied after an azimuth de-ramp process of the combined data. The computer simulations verify the validity of the proposed algorithm.
In this paper, the effect of the satellite yawing, pitching and rotating to the antenna beam pointing is analyzed. At the same time, how the antenna beam pointing error affecting the imaging quality is interpreted. Th...
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ISBN:
(纸本)9781510822023
In this paper, the effect of the satellite yawing, pitching and rotating to the antenna beam pointing is analyzed. At the same time, how the antenna beam pointing error affecting the imaging quality is interpreted. The most significant effect is that the pointing error will lead to paired echo in the SAR image and the paired echo may submerge the weak target. So in this paper we will present a method based on minimum entropy to compensate the beam pointing error and eliminate the paired echo. Finally, we present some simulation to verify the validity of the compensated method.
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