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This paper is concerned with the problem of attitude estimation for a wrist-worn motion sensor equipped with a 3-axis gyroscope and a 3-axis accelerometer. In the absence of motion and the with the arm in its natural resting state, the attitude is unobservable because the accelerometer's measurement of the gravity vector alone can not distinguish between configurations of the motion sensor obtained...
This paper presents theory, application, and comparisons of the feedback particle filter (FPF) algorithm for the problem of attitude estimation. The paper builds upon our recent work on the exact FPF solution of the continuous-time nonlinear filtering problem on matrix Lie groups. In this paper, the details of the FPF algorithm are presented for the problem of attitude estimation - a nonlinear filtering...
PM2.5 concentration can have significant impacts on solar irradiation and thus on photovoltaic (PV) power output. This paper presents a method to model impacts of PM2.5 concentration on PV power. A non-parametric kernel density estimation is used to fit the probability distribution of PM2.5 concentration. An incremental relation between the increase of PM2.5 concentration and the decrease of solar...
As IC technology advances, leakage current induced static power has become the major obstacle for chip to achieve high performance. Fast estimation of full-chip static power is difficult because static power depends nonlinearly on temperature. In this paper, we propose a new fast full-chip static power estimation method. The new method uses Taylor expansion based approximation to linearize the nonlinear...
This paper is concerned with the problem of continuous-time nonlinear filtering of stochastic processes evolving on a compact and connected matrix Lie group without boundary, e.g. SO(n), in the presence of real-valued noisy observations. This problem is important to numerous applications in attitude estimation, visual tracking and robotic localization. The main contribution of this paper is to derive...
For the high-speed and light Autonomous Underwater Vehicle (AUV), it is moving freely, and the speed and attitude are in dynamic movement. And for the micro electromechanical system (MEMS) technology based low-cost strapdown inertial navigation system (SINS), over too large bias drift errors not only made the system functions nonlinear, but also made the estimation for misalignment angle converge...
Light field photography provides a revolutionary possibility to reconstruct well-focused iris region from a 4D light-field image. However, such a “shoot and refocus” scheme is time-consuming in practice because it commonly needs to render an image sequence for finding the optimally refocused frame. This paper presents an efficient auto-refocusing iris imaging solution for lenselet-based light-field...
In Single Frequency Networks, the effect of intersymbol interference (ISI) and inter-carrier interference (ICI) is great due to the delay spread of wireless channels is much longer than a cyclic prefix (CP) .The performance of OFDM systems is degenerating seriously. This paper discusses a receiver design based on the implementation of a Decision Feed-back Equalizer (DFE). The proposed DFE receiver...
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