scholarly journals Application the SBAS/EGNOS Corrections in UAV Positioning

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 739
Author(s):  
Kamil Krasuski ◽  
Damian Wierzbicki
Keyword(s):  
Standard Deviation ◽  
Single Point ◽  
Gps Receiver ◽  
Weighted Mean ◽  
Mean Values ◽  
Navigation Data ◽  
Aerial Vehicle ◽  
Weighted Model ◽  
The Mean ◽  
Better Than

The paper presents a new concept of determining the resultant position of a UAV (Unmanned Aerial Vehicle) based on individual SBAS (Satellite-Based Augmentation System) determinations from all available EGNOS (European Geostationary Navigation Overlay Service) satellites for the SPP (Single Point Positioning) code method. To achieve this, the authors propose a weighted mean model to integrate EGNOS data. The weighted model was based on the inverse of the square of the mean position error along the component axes of the BLh ellipsoidal frame. The calculations included navigation data from the EGNOS S123, S126, S136 satellites. In turn, the resultant UAV position model was determined using the Scilab v.6.0.0 software. Based on the proposed computational strategy, the mean values of the UAV BLh coordinates’ standard deviation were better than 0.2 m (e.g., 0.0000018° = 0.01″ in angular measurement). Additionally, the numerical solution used made it possible to increase the UAV’s position accuracy by about 29% for Latitude, 46% for Longitude and 72% for ellipsoidal height compared to the standard SPP positioning in the GPS receiver. It is also worth noting that the standard deviation of the UAV position calculated from the weighted mean model improved by about 21 ÷ 50% compared to the arithmetic mean model’s solution. It can be concluded that the proposed research method allows for a significant improvement in the accuracy of UAV positioning with the use of EGNOS augmentation systems.

scholarly journals On The Estimation of Means and Variances In The Case Of Unequal Components

1975 ◽  
Vol 8 (3) ◽  
pp. 323-335 ◽  
Author(s):  
Esa Hovinen
Keyword(s):  
Standard Deviation ◽  
The Other ◽  
Insurance Companies ◽  
Loss Ratio ◽  
Weighted Mean ◽  
The Mean ◽  
Image Position ◽  
Statistical Work ◽  
Better Than

In practical statistical work one frequently meets certain problems. For instance, we may have the following data about loss ratios in certain insurance companies and corresponding, numbers of insurance in force:I assume further that we have no reason to believe that the companies, their loss ratios and their structure of insurances in force differ in any other way than by the size of companies. The problem is how to get quick estimates of mean losses and their variances in different companies?A straitforward way to estimate the mean loss ratio would be to compute the usual mean of numbers pi, (Σpi/6) = 14; its standard deviation is 6,5. As this procedure of the “first statistician” seems to be too simple and naive, a “more cautious” statistician would compute the weighted mean loss ratioThe “more cautious” statistician would arque that his result is much better than the other result 14. But what would be the variance of the estimate 7,1, and what is the variance in the different companies?

The analysis of temperature fluctuations by pulse-counting techniques

1959 ◽  
Vol 6 (2) ◽  
pp. 261-271 ◽  
Author(s):  
A. A. Townsend
Keyword(s):  
Time Derivative ◽  
Temperature Fluctuations ◽  
Mean Value ◽  
Time Intervals ◽  
Mean Values ◽  
Average Value ◽  
Electrical Pulses ◽  
The Mean ◽  
The Stability ◽  
Better Than

To determine experimentally the mean value of a randomly fluctuating quantity, it may be necessary to measure the average value over a considerable interval of time. This problem arose in a recent study of the temperature fluctuations over a heated horizontal plate, and a system was used that depended on the counting of electrical pulses generated at a rate proportional to the quantity being measured. The advantage of this technique is that mean values may be measured over time intervals of almost unlimited length with little added difficulty for the experimenter. Circuits are described which measure: (a) the mean square of a fluctuating quantity and of its time-derivative, (b) the statistical distribution of the fluctuations, (c) the mean frequency of the fluctuation assuming a particular value, and (d) the mean product of two fluctuating quantities. Over the range of use, the stability and linearity of the calibrations is better than 1%, more than sufficient for work on natural convection. In its present form, the equipment responds uniformly to all frequencies below 100 c/s, but it would not be difficult to extend this range of response to higher frequencies.

Contents of Some Heavy Metals in Norwegian Rivers

1978 ◽  
Vol 9 (3-4) ◽  
pp. 197-206 ◽  
Author(s):  
K. Lenvik ◽  
E. Steinnes ◽  
A.C. Pappas
Keyword(s):  
Heavy Metals ◽  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Sedimentary Rocks ◽  
Drainage Basins ◽  
Weighted Mean ◽  
Concentration Data ◽  
Mean Values ◽  
The World ◽  
The Mean

Concentration data for the elements arsenic, cadmium, cobalt, molybdenum, zinc, and uranium in eleven Norwegian rivers, determined by neutron activation analysis, are presented. The mean values of the various rivers show the following range for the elements studied (μg/1): As, <0.02-1.05. Cd, <0.06-0.43. Co, 0.09-0.46. Mo, <0.10-1.62, Zn, <2-53. U, 0.041-0.58. The weighted mean values in this work are similar to the estimated world averages for rivers in the case of Co and Zn. For As, Mo, and U, the present values are lower than the world averages by a factor of 3 or more. This may be due to lower abundance of sedimentary rocks and deposits in Norway compared with the drainage basins of some of the major rivers in the world.

scholarly journals Fourth ventricle computed tomography indexes: standardisation and characteristics in neurocysticercosis

2002 ◽  
Vol 60 (2A) ◽  
pp. 211-218 ◽  
Author(s):  
Svetlana Agapejev
Keyword(s):  
Computed Tomography ◽  
Standard Deviation ◽  
Fourth Ventricle ◽  
Control Group ◽  
Mean Values ◽  
Lateral Ventricles ◽  
The Mean ◽  
Ventricular Shunting

OBJECTIVES: to propose standardisation of fourth ventricle dimensions and to study its characteristics in neurocysticercosis. METHOD: a control group (CG) constituted by 114 individuals with normal CT, and 80 patients with neurocysticercosis composed the group with neurocysticercosis (GN). Measures of the inner cranial diameter (Cr), fronto-polar distance between both lateral ventricles (FP), antero-posterior (AP) and latero-lateral (LL) fourth ventricle width based the standardisation of six indexes. RESULTS: AP/Cr, AP/LL and AP/FP were the more discriminative indexes, presenting in CG the mean values of 0.063, 0.267 and 0.582, respectively. The indexes in GN had values statistically higher than in CG. From GN, 51patients had increased indexes values above 2 standard deviation of the CG mean. AP/Ll was > or = 1 in 95% of patients with ventricular shunting and in 88% with depression. It also occurred in 73% patients with satisfactory follow-up and in everybody who died. CONCLUSION: AP/Cr, AP/LL and AP/FP may represent fourth ventricle dimensions.

Mean alveolar gases and alveolar-arterial gradients in pulmonary patients

1979 ◽  
Vol 46 (3) ◽  
pp. 534-540 ◽  
Author(s):  
U. C. Luft ◽  
J. A. Loeppky ◽  
E. M. Mostyn
Keyword(s):  
Steady State ◽  
Mass Spectrometer ◽  
Dead Space ◽  
Best Approximation ◽  
The Other ◽  
Mean Values ◽  
The Best Approximation ◽  
The Mean ◽  
End Tidal ◽  
Better Than

In view of uncertainties about the best way to estimate mean alveolar gases in patients with ventilation-perfusion inequalities, three different methods were evaluated on 54 patients. 1) O2 and CO2 were recorded by mass spectrometer on an O2 (x)-CO2 (y) diagram. The coordinates at the intersect of the expiratory record with the mixed expired R line (RE) ives the mean alveolar values (PAo2 and PAco2. 2)pa'co2 was calculated with the Bohr equation using a predicted anatomic dead space and PA'o2 was derived with the alveolar equation. 3) End-tidal (ET) P02 were averaged over 1 min at rest in steady state. Mean RET calculated from 3 was identical with RE. Mean values for PAco2, PA'CO2. and PETco2 differed by less that 1 Torr, but the variance was least with the end-tidal method. There was a highly significant correlation between delta aAPco2 using PETco2 and VD/VT, better than with either of the other methods. The end-tidal measurement appears to give the best approximation of mean alveolar gas in pulmonary patients.

scholarly journals Comparison of Four Radiographic Angular Measures of Lumbar Lordosis

2018 ◽  
Vol 09 (03) ◽  
pp. 298-304 ◽  
Author(s):  
Francis Osita Okpala
Keyword(s):  
Standard Deviation ◽  
Lumbar Lordosis ◽  
Joint Angle ◽  
Mean Values ◽  
Normal Individuals ◽  
Wide Range ◽  
Normal Mean ◽  
The Mean ◽  
Range Of Values

ABSTRACT Background: Several attempts (radiographic and nonradiographic) have been made to measure the lumbar lordosis (LL), but the results differ substantially as investigators have used different parameters. Radiography is the gold standard, and the methods include lumbosacral angle (LSA), lumbosacral joint angle (LSJA), Cobb angle, and tangential radiologic assessment of LL (TRALL) angle. The traditional method, the Cobb technique, has a wide range of normal mean values, with a large standard deviation. Using a more reliable radiographic angle will hopefully simply and standardize LL measurement in the diagnosis, treatment, and follow-up of patients. Aim: To compare in normal individuals with fully developed LL the LSA, LSJA, TRALL, and Cobb angles, by determining (a) if any correlation exists between them and (b) the most reliable measures of LL, based on, least (i) number of measurement lines, (ii) range of values, (iii) mean, (iv) standard deviation, and (v) variance. Materials and Methods: The four angles were retrospectively measured in each supine lateral lumbosacral radiograph of 100 males and 100 females, aged 15 years and above. Data were analyzed with IBM SPSS Statistics 23.0 (NY, USA); P < 0.05 was considered statistically significant. Results: No correlation existed between the mean values of the four angles, and in each angle, there was no male-versus-female correlation. LSJA had the best reliability criteria for LL measurement. Conclusion: The mean LSA, LSJA, TRALL, and Cobb angles have no significant Pearson's correlation, and of the four angular measures of LL, LSJA was the most reliable.

Statistical Analysis of Homogeneous Systems of Polar Coordinates

1975 ◽  
Vol 26 ◽  
pp. 469
Author(s):  
E. Proverbio ◽  
S. Uras
Keyword(s):  
Statistical Analysis ◽  
Standard Deviation ◽  
Polar Coordinates ◽  
Mean Values ◽  
Homogeneous Systems ◽  
The Mean

AbstractIn 1972, Proverbio and Quesada compiled a list of seven homogeneous systems of polar coordinates expressed in tenths of years adopted by different authors. In the paper, the authors try to determine the internal correlation of the different systems of coordinates so as to represent the precision of each series for different frequency ranges. The analysis of the standard deviation of the raw residuals of the differences between the coordinates of each series and the mean values from the smoothed curve of the residuals provided further information about the accuracy of the same series of polar coordinates.

Statistical analysis of wind resource and energy potential assessment of Quaidabad site, Sindh Pakistan

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zahid Hussain Hulio ◽  
Gm Yousufzai ◽  
Wei Jiang
Keyword(s):  
Standard Deviation ◽  
Wind Speed ◽  
Energy Density ◽  
Wind Shear ◽  
Economic Assessment ◽  
Energy Potential ◽  
Content Type ◽  
Mean Values ◽  
The Mean ◽  
Wind Resource

Purpose Pakistan is an energy starving country that needs continuous supply of energy to keep up its economic speed. The aim of this paper is to assess the wind resource and energy potential of Quaidabad site for minimizing the dependence on fuels and improving the environment. Design/methodology/approach The Quaidabad site wind shear coefficient and turbulence intensity factor are investigated. The two-parameter k and c Weibull distribution function is used to analyze the wind speed of site. The standard deviation of the site is also assessed for a period of a year. The wind power density and energy density are assessed for a period of a year. The economic assessment of energy/kWh is investigated for selection of appropriate wind turbine. Findings The mean wind shear coefficient was observed to be 0.2719, 0.2191 and 0.1698 at 20, 40 and 60 m, respectively, for a period of a year. The mean wind speed is found to be 2.961, 3.563, 3.907 and 4.099 m/s at 20, 40, 60 and 80 m, respectively. The mean values of k parameters were observed to be 1.563, 2.092, 2.434 and 2.576 at 20, 40, 60 and 80 m, respectively, for a period of a year. The mean values of c m/s parameter were found to be 3.341, 4.020, 4.408 and 4.625 m/s at 20, 40, 60 and 80 m, respectively, for a period of a year. The major portion of values of standard deviation was found to be in between 0.1 and 2.00 at 20, 40, 60 and 80 m. The wind power density (W/m2) sum total values were observed to be 351, 597, 792 and 923 W/m2 at 20, 40, 60 and 80 m, respectively, for a period of a year. The mean coefficient of variation was found to be 0.161, 0.130, 0.115 and 0.105 at 20, 40, 60 and 80 m, respectively. The sum total energy density was observed to be 1,157, 2,156, 2,970 and 3,778 kWh/m2 at 20, 40, 60 and 80 m, respectively. The economic assessment is showing that wind turbine E has the minimum cost US$0.049/kWh. Originality/value The Quaidabad site is suitable for installing the utility wind turbines for energy generation at the lowest cost.

Variability of resting respiratory drive and timing in healthy subjects

1988 ◽  
Vol 65 (1) ◽  
pp. 309-317 ◽  
Author(s):  
M. J. Tobin ◽  
M. J. Mador ◽  
S. M. Guenther ◽  
R. F. Lodato ◽  
M. A. Sackner
Keyword(s):  
Standard Deviation ◽  
Healthy Subjects ◽  
Breathing Pattern ◽  
Respiratory Drive ◽  
Inspiratory Time ◽  
Mean Values ◽  
Coefficients Of Variation ◽  
The Mean ◽  
Older Subjects ◽  
Young Subjects

Studies of breathing pattern have focused primarily on changes in the mean values of the breathing pattern components, whereas there has been minimal investigation of breath-to-breath variability, which should provide information on the constancy with which respiration is controlled. In this study we examined the variability of breathing pattern both on a breath-to-breath and day-to-day basis by calculating the coefficient of variation (i.e., the standard deviation expressed as a percentage of the mean). By examining breath-to-breath data, we found that the coefficients of variation of tidal volume (VT) and fractional inspiratory time (TI/TT, an index of timing) obtained with an inductive plethysmograph and spirometer were within 1% of each other. Examination of breath-to-breath variability in breathing pattern over a 15-min period in 65 subjects revealed large coefficients of variation, indicating the need to base calculations on a relatively large number of breaths. Less breath-to-breath variability was observed in respiratory frequency [f, 20.8 +/- 11.5% (SD)] and TI/TT (17.9 +/- 6.5%) than in VT (33 +/- 14.9%) and mean inspiratory flow (VT/TI, an index of drive; 31.6 +/- 12.6%; P less than 0.0001). Older subjects (60-81 yr) displayed greater breath-to-breath variability than young subjects (21-50 yr). Use of a mouthpiece did not affect the degree of variability.(ABSTRACT TRUNCATED AT 250 WORDS)

scholarly journals In-vivo singlet oxygen threshold doses for PDT

2015 ◽  
Vol 4 (1) ◽  
Author(s):  
Timothy C. Zhu ◽  
Michele M. Kim ◽  
Xing Liang ◽  
Jarod C. Finlay ◽  
Theresa M. Busch
Keyword(s):  
Standard Deviation ◽  
Singlet Oxygen ◽  
Experimental Results ◽  
Mean Values ◽  
Threshold Doses ◽  
The Mean

AbstractObjective:Dosimetry of singlet oxygen (Material and methods:AnResults:The mean values (standard deviation) of theConclusions:The experimental results of [

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