Academic literature on the topic 'Float point error'

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Journal articles on the topic "Float point error"

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Jokinen, Altti, Shaojun Feng, Wolfgang Schuster, et al. "GLONASS Aided GPS Ambiguity Fixed Precise Point Positioning." Journal of Navigation 66, no. 3 (2013): 399–416. http://dx.doi.org/10.1017/s0373463313000052.

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The Precise Point Positioning (PPP) concept enables centimetre-level positioning accuracy by employing one Global Navigation Satellite System (GNSS) receiver. The main advantage of PPP over conventional Real Time Kinematic (cRTK) methods is that a local reference network infrastructure is not required. Only a global reference network with approximately 50 stations is needed because reference GNSS data is required for generating precise error correction products for PPP. However, the current implementation of PPP is not suitable for some applications due to the long time period (i.e. convergenc
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Zhu, Jiong, and Jian Cheng Kang. "The Ocean Temperature Reconstruction of Center Tropical Cyclone Based on Argo." Advanced Materials Research 864-867 (December 2013): 2171–74. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.2171.

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There is a correlation between sea surface temperature of the upper boundary waters and the intensity of typhoon. This paper analyzes the use of Argo float data and using inverse distance weighted interpolation method to calculate its internal regional sea surface temperature, when typhoon and other data were compared and error analysis. The results showed that: the method is reliable. When you select a point closer distance calculation and spatial distribution of Argo floats as closely as possible, the weight coefficients taken 2, known buoy number is 4-6, the relative error of calculated is
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Bingham, Frederick M., Severine Fournier, Susannah Brodnitz, Karly Ulfsax, and Hong Zhang. "Matchup Characteristics of Sea Surface Salinity Using a High-Resolution Ocean Model." Remote Sensing 13, no. 15 (2021): 2995. http://dx.doi.org/10.3390/rs13152995.

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Sea surface salinity (SSS) satellite measurements are validated using in situ observations usually made by surfacing Argo floats. Validation statistics are computed using matched values of SSS from satellites and floats. This study explores how the matchup process is done using a high-resolution numerical ocean model, the MITgcm. One year of model output is sampled as if the Aquarius and Soil Moisture Active Passive (SMAP) satellites flew over it and Argo floats popped up into it. Statistical measures of mismatch between satellite and float are computed, RMS difference (RMSD) and bias. The bia
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Chen, Wantong, and Zhenghui Shang. "Precision point positioning with additional baseline vector constraint." Journal of Applied Geodesy 14, no. 3 (2020): 303–15. http://dx.doi.org/10.1515/jag-2020-0006.

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AbstractTraditional precise point positioning (PPP) based on undifferenced ionosphere-free linear combination of observations has many advantages such as high accuracy and easy operation. PPP usually uses the Kalman Filter (KF) to estimate state vector. However, the positioning performance depends on the accuracy of the kinematic model and initial value. The inaccurate kinematic model or initial value will lead to filter performance degradation or even divergence. To overcome this problem, this paper proposes a PPP method with an additional baseline vector constraint, which uses the direction
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Xiong, Chunbao, Lina Yu, and Lewen Zhao. "Analysis on the Impacts of Slant Tropospheric Delays on Precise Point Positioning." Applied Sciences 9, no. 22 (2019): 4884. http://dx.doi.org/10.3390/app9224884.

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Tropospheric delay is one main factor affecting the accuracy of precise point positioning (PPP) ambiguity-float and fixed solutions. Investigations mainly focused on evaluating the contributions of tropospheric corrections to the accuracy and reliability of PPP solutions. The tropospheric corrections generally contained the zenith tropospheric delay (ZTD) and the horizontal gradients estimated from relative positioning or PPP. However, the estimated tropospheric delays can be partly absorbed by the carrier phase residuals if the stochastic model is not well-defined. Therefore, along with the Z
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Lu, Yangwei, Shengyue Ji, Rui Tu, Duojie Weng, Xiaochun Lu, and Wu Chen. "An Improved Long-Period Precise Time-Relative Positioning Method Based on RTS Data." Sensors 21, no. 1 (2020): 53. http://dx.doi.org/10.3390/s21010053.

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The high precision positioning can be easily achieved by using real-time kinematic (RTK) and precise point positioning (PPP) or their augmented techniques, such as network RTK (NRTK) and PPP-RTK, even if they also have their own shortfalls. A reference station and datalink are required for RTK or NRTK. Though the PPP technique can provide high accuracy position data, it needs an initialisation time of 10–30 min. The time-relative positioning method estimates the difference between positions at two epochs by means of a single receiver, which can overcome these issues within short period to some
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Yang, Yang, Xiaokui Yue, and Jianping Yuan. "GPS Based Reduced-Dynamic Orbit Determination for Low Earth Orbiters with Ambiguity Fixing." International Journal of Aerospace Engineering 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/723414.

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With the ever-increasing number of satellites in Low Earth Orbit (LEO) for scientific missions, the precise determination of the position and velocity of the satellite is a necessity. GPS (Global Positioning System) based reduced-dynamic orbit determination (RPOD) method is commonly used in the post processing with high precision. This paper presents a sequential RPOD strategy for LEO satellite in the framework of Extended Kalman Filter (EKF). Precise Point Positioning (PPP) technique is used to process the GPS observations, with carrier phase ambiguity resolution using Integer Phase Clocks (I
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Tian, Huanhuan, Yixiao Liu, Jiqin Zhou, Ying Wang, Jing Wang, and Weigong Zhang. "Attitude Angle Compensation for a Synchronous Acquisition Method Based on an MEMS Sensor." Sensors 19, no. 3 (2019): 483. http://dx.doi.org/10.3390/s19030483.

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As a new type of micro-electro-mechanical systems (MEMS) inertial sensor, the Quartz Vibrating Beam Accelerometer (QVBA) is widely used in intelligent sweeping robots, small aircraft, navigation systems, etc. For these applications, correcting and compensating the attitude angle with the result of acceleration plays an important role to improve the measurement accuracy. The synchronization error between the measurement of the accelerometer and gyroscope attitude angle has an adverse impact on the accuracy of the attitude angle. In this paper, a synchronous acquisition scheme of the acceleromet
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Tian, Zhiqiang, Jingyi Song, Chenyang Zhang, Xiaohui Tian, Zhong Shi, and Xiaofu Yu. "A Multiscale-Based Adjustable Convolutional Neural Network for Multiple Organ Segmentation." Wireless Communications and Mobile Computing 2020 (August 3, 2020): 1–13. http://dx.doi.org/10.1155/2020/9595687.

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Accurate segmentation ofs organs-at-risk (OARs) in computed tomography (CT) is the key to planning treatment in radiation therapy (RT). Manually delineating OARs over hundreds of images of a typical CT scan can be time-consuming and error-prone. Deep convolutional neural networks with specific structures like U-Net have been proven effective for medical image segmentation. In this work, we propose an end-to-end deep neural network for multiorgan segmentation with higher accuracy and lower complexity. Compared with several state-of-the-art methods, the proposed accuracy-complexity adjustment mo
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Moroz, Leonid V., Volodymyr V. Samotyy, and Oleh Y. Horyachyy. "Modified Fast Inverse Square Root and Square Root Approximation Algorithms: The Method of Switching Magic Constants." Computation 9, no. 2 (2021): 21. http://dx.doi.org/10.3390/computation9020021.

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Many low-cost platforms that support floating-point arithmetic, such as microcontrollers and field-programmable gate arrays, do not include fast hardware or software methods for calculating the square root and/or reciprocal square root. Typically, such functions are implemented using direct lookup tables or polynomial approximations, with a subsequent application of the Newton–Raphson method. Other, more complex solutions include high-radix digit-recurrence and bipartite or multipartite table-based methods. In contrast, this article proposes a simple modification of the fast inverse square roo
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Dissertations / Theses on the topic "Float point error"

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Gurecká, Hana. "Monitorování pracovního prostoru robotu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378012.

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The goal of theoretical part of the thesis is to sumarise basic procedures and algorithms for robotic workspace monitoring. The first chapter is focused on those procedures. Another important topic of thesis is problematics of floating point error in calculations accuracy. Representations of cones and conical surfaces are discussed in the last theoretical chapter. The practical part of the thesis is focused on implementation of cone AND truncated cone workspace monitoring algorithm in C++.
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Book chapters on the topic "Float point error"

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Hafien, Chedhli, Adnen Bourehla, and Mounir Bouzaiane. "Boundary Layer Theory: New Analytical Approximations with Error and Lambert Functions for Flat Plate without/with Suction." In Aerodynamics. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.88637.

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In this work, we investigated the problem of the boundary layer suction on a flat plate with null incidence and without pressure gradient. There is an analytical resolution using the Bianchini approximate integral method. This approximation has been achieved by Lambert or Error functions for boundary layer profiles with uniform suction, even in the case without suction. Based on these new laws, we brought out analytical expressions of several boundary layer features. This gives a necessary data to suction effect modeling for boundary layer control. To recommend our theoretical results, we numerically studied the boundary layer suction on a porous flat plate equipped with trailing edge flap deflected to 40°. We showed that this flap moves the stagnation point on the upper surface, resulting to avoid the formation of the laminar bulb of separation. Good agreement was obtained between the new analytical laws, the numerical results (CFD Fluent), and the literature results.
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Conference papers on the topic "Float point error"

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Deja, Mariusz. "Simulation Model for the Shape Error Estimation During Machining With Flat Lapping Kinematics." In ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34262.

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The selection of a finishing process for a particular application depends on part shape and size, ease of fixturing, requirements concerning the acceptable shape errors. Lapping is the basic flattening process which allows for achieving a high degree of flatness and parallelism of machined parts. It is still one of the most common processes to flatten the sliced silicon wafers. Grinding or wire-sawing induced waviness can be effectively removed or reduced by lapping. A required high degree of the tool flatness is not maintained permanently. The active surface of the tool used for machining wit
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Al-Ansary, Hany, Shaker Alaqel, Eldwin Djajadiwinata, and Abdullah Mohammed. "Optical Analysis of a New Point Focus Fresnel Concentrator." In ASME 2015 9th International Conference on Energy Sustainability collocated with the ASME 2015 Power Conference, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/es2015-49340.

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This study describes preliminary optical analysis performed regarding a new collector called the Point Focus Fresnel Concentrator (PFFC). This collector combines the concepts of the linear Fresnel collector and central receiver systems to form a new concept of a focal point Fresnel concentrator with a dual-axis sun tracking system. It concentrates direct solar radiation using a number of flat mirrors positioned over a rotating frame. The frame tracks the sun in the azimuth direction, while each row of mirrors tracks the sun in the elevation direction, thereby allowing sunlight to be concentrat
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Cheng, Tze-Yuan, Daxiang Deng, and Cila Herman. "Curvature Effect Quantificaiton for In-Vivo IR Thermography." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88105.

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Medical Infrared (IR) Imaging has become an important diagnostic tool over recent years. However, one underlying problem in medical diagnostics is associated with accurate quantification of body surface temperatures. This problem is caused by the artifacts induced by the curvature of objects, which leads to inaccurate temperature mapping and biased diagnostic results. Therefore, in our study, an experiment-based analysis is conducted to address the curvature effects toward the 3D temperature reconstruction of the IR thermography image. For quantification purposes, an isothermal copper plate wi
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Willis, David J., Jacob K. White, and Jaime Peraire. "A pFFT Accelerated BEM Linear Strength Potential Flow Solver." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-3115.

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In this paper the development of a linear shape function, Galerkin Boundary Element Method (BEM) for solving the direct potential flow integral equation around arbitrary 3-Dimensional bodies is described. The solution of the potential flow for both constant and linear shape functions over a triangulated body surface is examined. In order to facilitate a larger and more practical number of panels, an iterative GMRES [1] matrix solution method is coupled with a precorrected Fast Fourier Transform (pFFT) approximate matrix vector product (MVP)[2]. The pFFT algorithm is described and the differenc
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Jacobson, Douglas, Barry Fussell, and Robert Jerard. "Tool Runout Estimation Using Feed Force Spectral Components." In ASME 2006 International Manufacturing Science and Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/msec2006-21131.

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Cutter Runout is the eccentricity caused by a combination of imperfections in the cutting tool, tool holder, and spindle. While magnitudes of cutter runout are generally small (e.g 10 μm), the effect is noticeable in high tolerance finishing operations, and can cause significant variations in the force experienced on a multi tooth cutter. The goal of this research is to design and evaluate an indirect runout estimation method, using feed force components at the spindle and tooth passing frequency. The accuracy of the method is evaluated for a range of cutting conditions for 4 and 6 tooth helic
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Gokaltun, S., P. V. Skudarnov, C. X. Lin, and Hugh Thornburg. "Verification and Validation Studies for Laminar Hypersonic Flow Over a Blunted Cone and a Flat Plate." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98369.

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In this paper, verification and validation analysis for laminar hypersonic flow fields is presented. The simulations include a Mach 8 flow of calorically perfect gas over a spherically blunted cone and a Mach 14 flow over a flat plate. Numerical results were obtained using the finite volume method on structured grids. The verification of the numerical solutions was performed by calculating the Grid Convergence Index (GCI) for both test cases. A set of three different grids is used to calculate the discretization uncertainty, where each grid was generated by doubling the number of cells in each
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Ihn, Yong Seok, Sae Whan Park, and Ja Choon Koo. "Position Alignment of Micro Manipulator Using Root Mean Square Errors for Maskless Lithography System." In ASME 2013 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/isps2013-2943.

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A precision optical exposure process of lithography has become one of the essential processes to manufacture and develop micro electro mechanical system (MEMS) devices, flat panel display (FPD), and semiconductor. For a typical exposure process for the lithography, a photomask that is often very expensive is required to generate patterns[1]. So it is very inefficient not only in terms of cost but also the time due to the reliance on the photomasks in development. The alternative solution is the maskless lithography system, which does not use photomasks since the patterns are generated by using
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Jyrkama, M. I., M. D. Pandey, and M. Li. "Methodology for Identifying Blunt Flaws Using Ultrasonic In-Service Inspection Data." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-85138.

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This paper presents a methodology for identifying blunt flaws in piping using in-service data from ultrasonic inspection tools. The method is applicable to data obtained from predetermined inspection grids, or directly from bracelet or array type inspection tools. The flaw edge and size are identified by calculating the three-dimensional slope vector (i.e., magnitude and direction) of each point in the kriging interpolated wall thickness profile. The transition from a steeper slope to a relatively flat profile is then used by a search algorithm to determine the flaw edge. The method is applied
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Eça, Luís, Guilherme Vaz, Arjen Koop, Filipe Pereira, and Hugo Abreu. "Validation: What, Why and How." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54005.

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Offshore and Naval engineering have relied on physical models, i.e. experimental fluid dynamics (EFD), for several decades. Although the role of experiments in engineering is still unquestionable, some of the limitations of physical models, as for example domain size (blockage and scale effects), can be addressed using mathematical models, i.e. computational fluid dynamics (CFD). However, to gain confidence in the use of CFD it is fundamental to determine the modelling accuracy, i.e. to determine the difference between the “physical reality” and the selected mathematical model. The quantificat
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Lenzi, Giulio, Andrea Fioravanti, Giovanni Ferrara, and Lorenzo Ferrari. "Development of an Innovative Multi-Sensor Waveguide Probe With Improved Measurement Capabilities." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26425.

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Currently waveguide probes are widely used in several turbomachinery applications ranging from the analysis of flow instabilities to the investigation of thermoacoustic phenomena. There are many advantages to using a waveguide probe. For example, the same sensor can be adopted for different measurement points, thus reducing the total number of sensors or a cheaper sensor with a lower operating temperature capability can be used instead of a more expensive one in case of high temperature applications. Typically, a waveguide probe is made up of a transmitting duct which connects the measurement
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