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We consider a range estimation algorithm based on the time-of-arrival differences between multipath replicas of a signal transmitted by an anchor node of known location to a silent node that needs to localize itself. We consider the geometry of the problem in the simplified case of a constant sound speed profile (SSP), and argue that the more realistic case of a non-constant SSP can be still tackled...
The author has introduced a generic method for photogrammetric survey using a multi-rotor unmanned aerial vehicle (UAV) for mapping a simulated model and slope area. The objective of this study is to assess the capabilities of UAV for slope mapping. This study only concentrates on multi-rotor UAV, which is known as Hexacopter. Several ground control points (GCP) and checked point (CP) were established...
With emerging synchronized phasor measurement technology, estimating dynamic state in real time (post fault) for the grid operation become feasible. However, PMU measurements undergo random errors and bad data unavoidably caused by the sensor errors, disturbances, etc. The traditional centralized state estimation methods for power system static state are not applicable for the electro-mechanical transient...
In this paper, we propose an algorithm for estimating the carrier frequency offset (CFO) in OFDM-based multi-cell networks. In 3GPP-LTE single-cell systems, the CFO can be estimated by applying the Schmidl algorithm. However, multi-cell interference (MCI) is induced in multi-cell environments; as a result the MCI degrades estimate accuracy. One solution to mitigate MCI may be via properly designing...
This paper presents an error-resilient wavelet-based ECG processor under voltage overscaling (VOS). A novel predictor based on weighted-average bilateral estimation (WBE) is proposed and used for algorithmic noise tolerance (ANT) that compensates the VOS-incurred errors. A two-stage ANT mechanism using heterogeneous error-detection techniques is developed, which enhances the robustness of ANT. This...
Channel mismatches of time-interleaved analog-to-digital converters (TIADC) would result in significant decline of dynamic performance, especially in signal-to-noise and distortion ratio (SNDR) and spurious-free dynamic range (SFDR). However, as one kind of the channel mismatches, nonlinearity mismatch has not been widely investigated. In this paper, we analyze the characteristics of nonlinearity...
Fuel injection rate shaping is one path towards cleaner and more efficient diesel engines. Piezoelectrically actuated fuel injectors meet this requirement, but can exhibit improved model-based estimation performance when their internal parameters are estimated on line. To this end, this paper presents an online parameter estimation strategy for a piezoelectric fuel injector that results in improved...
In this paper, reducing the linearization error of Kalman filters family for nonlinear simultaneous localization and mapping (SLAM) problem is investigated and two new methods are presented to reduce the linearization error. Inaccuracy of the formula used to calculate the slope of linear approximation of observation function (Hk) leads to severe linearization error in Kalman filters family. These...
This paper presents an analytical method for one to compute the centroid of the overlapping area of two intersecting circles with arbitrary orientation. We also extend the solution to estimate the centroid of the overlapping area of three intersecting circles. Furthermore, based on the analytical solution of centroid computing, we propose a cell-based localization technique, namely Centroid Based...
In this paper, we propose a novel range-free localization algorithm able to reduce errors due to mapping the hops into distance units. Using the proposed algorithm, the mean hop size h̄s is locally derived at each regular or position-unaware node, thereby avoiding its broadcast by anchors (i.e., a few nodes aware of their exact position) as usually required in current state-of-the-art solutions and,...
This paper introduces a new joint probability density function (JPDF) for estimating delay-power distribution. Linear and logarithmic skewness factors have been used for estimating the accurate JPDF. Both proposed models are compared to bivariate normal model for NAND2, NAND3, NOR2, NOR3 circuits and ISCAS85-C432We verified the accuracy of our proposed model using Nangate 45nm standard cell library...
The estimation of the fundamental matrix is an important problem in epipolar geometry. Many estimation methods have been proposed before, including the eight-point algorithm, Simple Evolutionary Agent (SEA) and RANSAC. In this paper, we investigate the evolutionary agent-based algorithm for fundamental matrix estimation, and present a new algorithm that improves the existing evolutionary algorithm...
This paper focuses on the construction confidence intervals and confidence limits of products' reliability based on the distribution-based model, a widely applied degradation model. The model is briefly reviewed in the first place with a focus on the sources of uncertainties associated with it. By simulating the propagation of these uncertainties, a simulation-based approach for the constructions...
A positioning approach based on through-wall propagation model is proposed to mitigate the non-line of sight (NLOS) error and improve the performance of Ultra-Wideband (UWB) through-wall localization. In NLOS conditions, there exist biases in the range differences determined by time difference of arrival (TDOA) measurements. The error due to wall effect, which is dominant error in position estimation,...
Due to the decentralized nature of structured P2P systems, there is no a direct way for a single node of getting aggregate statistics about the whole network, such as its current size. In this paper we focus on the problem of estimating the size of one of the most popular structured P2P networks, Chord, using a sampling-based approach. With this approach, a node calculates an estimate of the network...
Range-free localization schemes are much promising in wireless sensor networks because they can estimate the location of a sensor node without power-consuming and expensive devices for measuring distance or angle information. Among range-free schemes, multi-hop schemes can localize sensor nodes with a few beacon nodes through the multi-hop connection between nodes. Since the localization accuracy...
The use of robotics in distributed monitoring applications requires wireless sensors that are deployed efficiently with an awareness of the information gain, communication constraints, resource allocation and coordination, and energy utilization. In this paper, we address the estimation of a parameterized spatial field distribution with a group of mobile robots sampling adaptively and using a statistically-aware...
In this paper, a simple microphone array is proposed to estimate the direction and distance of a sound source in 2D space. The microphone array consists of three elements and these microphones are arranged in cross form. Based on the geometrical relationship and the estimated time delays between each pair of microphones, a method is proposed to directly get the direction and distance of the sound...
Previous work about cooperative localization in cellular networks usually consider a centralized processor (CP) is available for location estimation. This paper consider cooperative localization in a distributed base station (BS) scenario, where there is no CP, and the distributed BSs are responsible for location estimation. In this scenario, Global Positioning System (GPS) enable mobile terminals...
Many applications that use sensor data from a wireless sensor network (WSN) require corresponding node position information as well. Additionally, some routing protocols use position to determine viable routes. Several localization algorithms have been proposed which can be categorized as: range-based and range-free algorithms. In this paper, we propose a Modified Gram Schmidt DV-Hop algorithm (MGDV-Hop)...
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