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The paper presents an approach to calibration of inertial measurement units (IMU) for space application based on hemispherical resonator gyroscopes without accelerometers on a two-axis calibration turntable. The conventional sensor instrumental errors include bias and scale factor, temperature variations of the factors above and misalignment of sensitive axes. Also, additional quantities associated...
The complexity of transportation systems often dictates detailed representation of time-dependent demand and supply interaction through Dynamic Traffic Assignment (DTA). These complex models involve a large number of global parameters (behavior and congestion features) and main inputs (demand and supply characteristics) that require to be calibrated off-line, while stream of data coming from the field...
This paper presents a SAR ADC that is much smaller and faster than the recently reported precision (16-bit and beyond) SAR ADCs [1, 2, 3]. In addition, it features low input capacitance and an efficient on-chip foreground calibration algorithm to fix bit weight errors. Several other enabling techniques are also used, including signal independent reference switching using reservoir capacitors to improve...
Pulse oximetry is one of the most commonly employed monitoring modalities in critical care setting. Conventional pulse oximeters, use two leds and a photodiode to estimate the percentage of oxyhemoglobin and deoxyhemoglobin, assuming that those are the only light absorbers in the blood. Nevertheless, the presence of other types of dyshemoglobin may invalidate their calibration. In this study, we employed...
A 10-bit 2GS/s time-interleaved SAR ADC with low-complexity background timing skew calibration is presented. 10% of the area is utilized for the interleaving mismatch estimation and correction. The ADC achieves −64dB mismatch spur and 50.1dB SNDR at Nyquist rate, with 10.4mW power consumption and 0.014mm2 area in 16nm.
We consider some principal problems on precise attitude determination of the maneuvering land-survey satellites placed on the orbit altitudes from 600 up to 1000 km. We present onboard discrete algorithms for signal processing, calibration and alignment of astroinertial attitude determination system which is a part of the strapdown inertial navigation system.
We consider some principal problems on precise attitude determination of the free-flying robots and maneuvering land-survey mini-satellites operated on the orbit altitudes from 550 up to 1000 km. We present onboard discrete algorithms for signal processing, calibration, alignment and verification of an astroinertial attitude determination system which is a part of the strapdown inertial navigation...
New technologies in the fields of relative navigation and control strategies are required and ground-based testbeds can be successfully used to develop and validate these required advancements both in hardware and software. Several design aspects have to be taken into account when reproducing on the ground a reduced-gravity environment typical of satellites on orbit. This paper describes the design...
It is of practical interest to automatically calibrate the multiple sensors in autonomous vehicles. In this paper, we deal with an interesting case when used low-resolution Lidar and present a practical approach to extrinsic calibration between monocular camera and Lidar with sparse 3D measurements. We formulate the problem as directly minimizing the feature error evaluated between frames following...
Depth information affects greatly the accuracy of image measurement, 3D reconstruction and image recognition. In general, the methods of obtaining depth information are from 3D laser scanners, structured light, and depth cameras. The traditional method using binocular camera to obtain the depth information of images is based on the disparity between the left and right views, but it also brings some...
We tackle the multi-view image rectification problem by exploiting inter- and intra-disparity constraints. The inter-disparity consistency constraint encourages uniform disparity values for all pairs of neighboring frames, e.g., a 3D point should give the same disparity value for all pairs of stereo images. In addition, the intra-disparity consistency constraint keeps the original shape of the image...
This paper proposes an information addition system onto books by using projector-camera system. Recently, e-books have become widespread. E-books have features that traditional books do not have, such as sharing added comments and highlights with other readers. On the other hand, some users still prefer paper books. Thus, in this paper, we aim to realize adding and sharing comments/highlights in paper...
This paper presents a technique to estimate the time skew in time-interleaved ADCs. The proposed method estimates all of the time skew parameters jointly based on observations from a bank of correlators. The proposed method works for an arbitrary number of sub-ADCs. For implementation of the correlator bank, we propose the use of Mitchell's logarithmic multiplier and a hardware reuse mechanism, thereby...
The adoption of the digital/time converter (DTC) circuit has improved the performance of ΔΣ fractional-N phase-locked loops (PLLs). Accurate cancellation of ΔΣ quantization error via the DTC requires an automatic calibration made by an LMS loop. A high-order ΔΣ speeds up calibration convergence and improves PLL spectral purity, though at the price of larger quantization error and wider DTC range....
Real-time user positioning and navigation services are widely used daily by millions of people. The challenge is that common global positioning systems fail in indoor environment or in scenes with a limited sky view. In the paper, the indoor navigation framework based on the Bluetooth beacons is proposed. Such system allows user to obtain the position in GPS denied environment on a real-time basis...
We have investigated the possibility of studding different materials and configurations of system depending on the distance between the sample and the antenna using absorber. Particular attention was paid to calibrating the system prior to commencement of measurements.
In this paper, we present an effective and accurate gaze estimation method based on two-eye model of a subject with the tolerance of free head movement from a Kinect sensor. To accurately and efficiently determine the point of gaze, i) we employ two-eye model to improve the estimation accuracy; ii) we propose an improved convolution-based means of gradients method to localize the iris center in 3D...
In this paper, we present an efficient method to accelerate the depth estimation for the RGB-D camera. Our approach can obtain more depth information and extend the measurement range in two steps. First, we estimate the depth of positions that are too far away and irrelevant to any objects or plans using the color camera and a gyroscope. To adapt to any situations and angels, we use a virtual plane...
Calibration of color and infra-red cameras is the fundamental step in almost every 2D or 3D image processing applications and pre-processing of images and videos. This article presents a novel method for estimation of 19 parameters of RGB and depth camera calibration in Kinect sensor, simultaneously. The proposed algorithm is based on applying shuffled frog leaping algorithm (SFLA) for deep optimization...
In this paper, we present a real-time instantaneous phase estimation technique for the calibration of swept source optical coherence tomography (SS-OCT) systems. The proposed algorithm is able to accurately estimate both the amplitude and phase content of a swept source signal. The results are robust in the presence of substantial noise. Furthermore, the resulting phase profile is readily unwrapped,...
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