Analysis of Data from the . . .
ثبت نشده
چکیده
This report describes the analysis of results of a Lincoln Laboratory experiment which consisted of a series of bistatic scatter and radar measurements of the scattering cross section per unit volume of rain and thin turbulent layers. Results of tbe experiment are presented as average and rms values of the ~ of the bistatic scatter cross section as calculated using the radar data to the cross section as measured with the bistatic scatter system. The goal of the experiment was to test the precision of the approximate description of scattering due to rai; and thin turbulent layers used in interference prediction. The experiment utilized a i 43-km scatter path from Avon, Connecticut, to the Westford Comnmnicatiom Terminal that was operated at 7.74 GHz during the summer of 1968 and at 4.515 GHz during the summer and fall of i 970. Simultaneous radar observations were made with tbe MiIIstone Hill i .295-GHz radar in West ford, Massachusetts. Scatter measurements were made using scattering angles that ranged from 2 " to i80 ". The measurements showed that the approximate descriptions of scattering due to rain and thin turbulent layers adequately describe the scattering process within the maximum calibration uncertainties of both the bistatic scatter system and the radar. Tbe average ratios of calculated-to-measured cross section for scattering by rain were +1.2 dB at 4. 5i 5 GHz during the summer of i 970 and-i.6 dB at 7.74 GHz during the summer of 1968. The average ratio of calculated-to-measured cross section for scattering by snow was +2. i dB measured during the fall of 197o. The average ratio for turbulent scatter was-0.8 dB measured during the fall of 1970. The maximum errors in the estimation of the ratio due to calibration uncertainty were 2.7 dB for the i 970 measurements and 3.7 dB for the i968 measurements.
منابع مشابه
A Common Weight Multi-criteria Decision analysis-data Envelopment Analysis Approach with Assurance Region for Weight Derivation from Pairwise Comparison Matrices
Deriving weights from a pairwise comparison matrix (PCM) is a subject for which a wide range of methods have ever been presented. This paper proposes a common weight multi criteria decision analysis-data envelopment analysis (MCDA-DEA) approach with assurance region for weight derivation from a PCM. The proposed model has several merits over the competing approaches and removes the drawbacks of...
متن کاملA Study on the Financial Performance of Companies Using Data Envelopment Analysis Model and Zemijsky's Model and a Comparison of their Results
Recent bankruptcy of big companies all over the world and fluctuations in Iran's stock market require that some methods be developed for the evaluation of companies' financial potential. Different models are used for the prediction of bankruptcy and the evaluation of organizational financial situation. Environmental changes and increasing competition among agencies led to companies' and organiz...
متن کاملData Envelopment Analysis from simulation on the Lattice QCD using CCR model
One of the most serious principles in production theory in economic is the principle of "efficiency". Simply put, efficiency can be defined as the demand that the desired goals (outputs) are achieved with the minimum use of the available resources (inputs). In order to, distinguish the relative efficiency of organizational units with multiple inputs to produce multiple outputs, "Data Envelopmen...
متن کاملCombined Data Envelopment Analysis and Analytical Hierarchy Process Methods to obtain the Favorable Weights from Pairwise Comparison Matrix
متن کامل
Estimation of Flow Zone Indicator Distribution by Using Seismic Data: A Case Study from a Central Iranian Oilfield
Flow unit characterization plays an important role in heterogeneity analysis and reservoir simulation studies. Usually, a correct description of the lateral variations of reservoir is associated with uncertainties. From this point of view, the well data alone does not cover reservoir properties. Because of large well distances, it is difficult to build the model of a heterogenic reservoir, but ...
متن کاملMulti-Objective Model for Fair Pricing of Electricity Using the Parameters from the Iran Electricity Market Big Data Analysis
Assessment of the electricity market shows that, electricity market data can be considered "big data". this data has been analyzed by both conventional and modern data mining methods. The predicted variables of supply and demand are considered to be the input of a defined multi-objective for predicting electricity price, which is the result of the defined model. This shows the advantage of appl...
متن کامل