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Upload a scanned PDF file and convert the PDF file to editable Word file. ... (OCR): Optical character recognition (OCR) is the conversion of images into text. The most-used method today for calculating rain attenuation was developed by the International Telecommunications Union Radio Section (ITU-R) However, there are other methods, such as the Crane method (used mainly in the United States) and methods more suitable for specific radio climates, such as wet tropical and equatorial areas There are differences between the two most popular models, the ITU terrestrial and Crane models, which produce slightly different estimates of the long-term fade probability Variability is inherent in the estimation of path fading because empirical equations have been derived from measurement points around the world over limited periods of time Rain attenuation, which is the dominant fading mechanism for millimeter wave paths, is based on nature, which can vary from location to location and from year to year An underestimate of the required margin to compensate for a given probability of rain outage results in a system that does not meet link availability requirements It is obvious that the uncertainty of either model or, alternatively, the short-term expectation of fade, is quite large The uncertainty, as measured by the estimated attenuation standard deviation, is greater than 30 percent and tends to overshadow arguments about the accuracy of the methods The uncertainty is a result of variations from year to year and location to location Location to location within a rain zone, we also find a high estimated attenuation standard deviation In addition, worst-month predictions forecast much higher fade depths than the basic annual predictions Microwave link design is sometimes a balancing act between contradicting requirements If availability guarantees are accepted in system contracts, cost incentives may have to be paid for under designing a system and not meeting those guarantees On the other hand, overestimations of the required margin may result in the overdesign of systems, which results in unnecessary system costs The Crane models (after Robert K Crane) are popular for spaceEarth links but also have terrestrial models There are three versions of the Crane models The global Crane model was developed in 1980 In 1982, the two-component Crane model was developed, which used a path-integrated technique A volume cell contribution and a debris contribution for a path were computed separately and added to provide a link calculation As a refinement of the two-component model, the revised two-component model was introduced in 1989, which includes spatial correlation and statistical variations of rain within a cell All these models are described in Crane s book8 A rain event consists of small volume cells of intense rain rate within much larger debris regions with a lower rain rate The dimensions of. online pdf to word converter apk: Convert PDF to Word online . Free PDF to DOC converter - iLovePDF free online pdf to editable word converter for large files Convert PDF to Word | Online .doc converter
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Convert your PDF file into editable word documents with the best PDF to Word converter. Preserve the PDF files' fonts, paragraphs, lists, tables, and columns in ... these areas are inversely related to rain rate Volume cells are quite small, generally less than 50 km2, with the average volume cell area of about 30 km2 over the range of rain rates 20 to 40 mm/hr, which is often of interest as design targets for microwave systems This could be represented as a rectangle of about 16 3 km in size (rain cells are usually not circular) Calculation by the ITU model is straightforward by scaling the 001 percent rain rate and by using an effective path-length reduction factor to account for the cellular nature of heavy rainfall Mean cumulative distributions of rainfall zones are defined geographically in ITU-R Recommendation P8379 The latest revision is P837-5 (2007), with the new maps generated using the ECMWF (European Centre for Medium-Range Weather Forecast) ERA-40 reanalysis database This database is a new product generated by ECMWF using improved assimilation and forecast procedures and covering a longer time period with improved spatial resolution In addition, the regression coefficients used in the prediction of rainfall rate have been optimized Rainfall rate statistics with a 1-min integration time are required for the prediction of rain attenuation in terrestrial and satellite links Data of long-term measurements of rainfall rate may be available from local sources but only with higher integration times This recommendation provides a method for the conversion of rainfall rate statistics with a higher integration time to rainfall rate statistics with a 1-min integration time The Crane rainfall zones are defined differently from the ITU zones, with more defined zones in the US than the ITU zones Currently, the ITU-R provides Recommendation ITU-R P530-xx for calculating the average annual, 1-min averaged, rain fade distribution experienced by a terrestrial link The prediction method refers to Recommendation ITUR P837 for calculating the average annual, 1-min averaged, rain rate distribution and to Recommendation ITU-R P838 for the specific attenuation-rain rate relationship Recommendation ITU-R P530-xx also provides some guidance for extending these models for the performance of a simple link to predict the performance of more complex links such as multihop links and links utilizing diversity The ITU has recommended a calculation method for terrestrial systems, ITU-R P530-xx, and for space-to Earth-links, ITU-R P618 These models take into account a distance reduction factor to account for the cellular nature of storms and have improved since the original CCIR version. pdf to word converter for mac online OCR will activate if you upload a scanned document. Wait for the converter to finish and download your Word file.
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Use this form to upload a scanned PDF file and convert the PDF file to editable Word file. The layout will be kept in output Word file. 2. Select a Word format, click "Convert Now!" Requires presence of interrogator to work Larger size and weight Costs more Limited battery life (2 to 7 years) Battery sensitive to harsh environment At the time of writing this book, the latest revision of this model was ITU-R-P530-12 In most cases, the Crane models predict higher rain attenuation; in other words, they are more conservative than the ITU model More detailed information on attenuation due to hydrometeors other than rain is given in ITU-R Recommendation P840 . convert pdf to word to edit text free online PDF to DOC – Convert PDF to Word Online
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