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This paper presents the measurement of long-time equivalent magnetic field fluctuations. It was obtained with a low noise off-diagonal GMI magnetometer. Acquisitions are conducted with a dedicated acquisition system. The GMI sensor principle and associated noise sources are reminded. Furthermore, the noise model is extended to include the impact of the very low frequency drift of the associated GMI...
The application of the proposed mathematical tools, that can be used for signal processing self-generating transducers of physical quantities, are considered. Its operating mechanism is based on frequency modulation, when the frequency deviation depends on the intensity of exposure measurement parameter. It is shown that the action for leveling additive errors in the channel the signal generator is...
The small signal levels provided by the limited size and inertial mass of miniature, open-loop MEMS accelerometers provide a challenging problem to achieve low noise and high stability needed for navigation and other applications. The challenge is made more difficult when different applications need to operate at a wide range of different peak g-levels. This paper discusses the performance achieved...
This paper presents an estimation procedure for exploiting multipath signal propagation in shallow water to perform passive ranging. The scenario of interest is a pair of sensors receiving an underwater acoustic signal that has arrived via a bounce from the ocean floor. This approach also applies in other situations, for example, to multiple airborne sensors passively receiving emissions from an airborne...
With the rapid development of sensor technology, multiple sensors are often available in many engineering applications, such as space object tracking. How to effectively use multiple sensor information is the key to achieving accurate space object state information. In this paper, the information weighted consensus (IWC) strategy is deployed to solve the cooperative sensor tracking problem. In addition,...
Integration and exploitation of information collection across a distributed network of assets usually requires the establishment and maintenance of registration of coordinates across the nodes of the network. Here “registration” covers a range of possibilities, including clock synchronization and registration of frames of reference. The registration problem is posed in terms of network represented...
In this paper, we consider a special multi-source data clustering problem for which the data-points from the same source cannot be grouped into the same cluster, namely cannot link (CL) constraint, and the sizes of the generated clusters are subject to maximum thresholds. No prior information is given about the level of clutter (namely noisy data) or the number of clusters. Particularly, the clusters...
In order to improve the accuracy of INS/GPS integrated navigation system during GPS signals blockage, an effective and low-cost method is to design the corresponding linear or non-linear predictor to predict the position and velocity errors between INS and GPS during GPS blockage and then to correct the results of INS. Based on the distributed data fusion system, a novel hybrid prediction method that...
When tracking an extended object, traditional approaches exploit information only from measurements that are assumed to stem from the target, and discard observations assumed to have been generated elsewhere. However, the fact that these observations were received contains valuable information about where the target is not. This information, which is usually treated as clutter with little value, can...
The use of random matrices for tracking extended objects has received high attention in recent years. It is an efficient approach for tracking objects that give rise to more than one measurement per time step. In this paper, the concept of random matrices is used to track surface vessels using highresolution automotive radar sensors. Since the radar also receives a large number of clutter measurements...
This paper proposes a hybrid DM Electromagnetic Interference (EMI) input filter model for AC-DC converters. After briefly reviewing DM EMI noise model for AC-DC converters, a closed loop filter model is developed. Based on the closed loop model, the open loop characteristics required for active filter's stable operation is determined. The constraints and requirements for the efficient implementation...
A single-shunt current sensing technique is widely used in industrial system to reduce the cost and mounting space of current sensors in an inverter. In addition, a pulse shift control technique, which maintains the pulse duration and achieves reliable current detection, is used in a single-shunt current sensing system. In this paper, the RMS current on the DC-link capacitor with a pulse shift control...
A research approach of crack detection of rotating shafts based on acoustic emission (AE) signals and machine learning is proposed in this paper. The relationship between crack intensity and domain features are investigated, and the features which could well indicate the crack condition are selected for modelling and crack prediction. Multiple Linear Regression (MLR), Artificial Neural Networks (ANN)...
Radiation induced soft errors are a serious concern not only for memories but also logic circuits. Amongst the several proposed countermeasures, Bulk Built-in Current Sensors represent a promising approach with fast response times and reasonable costs in terms of area and power. However, these circuits, as well as similar sensors that measure substrate effects, are strongly susceptible to substrate...
A trace gas sensor platform based on quartz-enhanced photoacoustic spectroscopy using quartz tuning forks (QTFs) with resonant frequency of 38 kHz and 40 kHz were experimentally investigated and theoretically analyzed for the first time.
In order to obtain wood acoustic emission signal waveform. A multi channel acoustic emission signal acquisition system based on NI high-speed data acquisition equipment was constructed. At the same time, a signal wavelet extraction and processing platform based on Lab VIEW software was designed, which can be used to collect, separate, extract the acoustic emission signal, spectral analysis and other...
This paper introduces a novel low-power Ion-Sensitive Field Effect Transistor (ISFET) readout configuration compatible with standard CMOS technology that utilizes chopping technique to reduce the 1/f noise and the offset of the readout circuitry. In addition, the proposed scheme tackles the well-known non-idealities of the ISFET such as the trapped charge and the long-term drift by using a resetting...
This paper presents an open loop readout circuit technique for capacitive inertial sensors using a charge balanced and ratiometric approach. The charge balance is achieved through a delta-sigma loop allowing for direct analog-to-digital conversion at comparatively lower power. Techniques for achieving differential implementation, noise and offset cancellation are also discussed in lieu of the limitations...
Compressed sensing (CS) or compressive sampling deals with reconstruction of signals from limited observations/ measurements far below the Nyquist rate requirement. This is essential in many practical imaging system as sampling at Nyquist rate may not always be possible due to limited storage facility, slow sampling rate or the measurements are extremely expensive e.g. magnetic resonance imaging (MRI)...
In this paper we deal with (step and crease) edge preserving smoothing and normal estimation in low depth-resolution range images. As a result of short base distance stereo, compression or scene geometry, such range images consist of few discrete range values. We propose a method for smoothing such range images by interpolation while preserving boundary and crease edges, and estimating surface normals...
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