File:A comparison of high-latitude ionosphere propagation predicitions from AMBCOM with measured data (IA acomparisonofhig1094543734).pdf
Original file (1,275 × 1,650 pixels, file size: 3.65 MB, MIME type: application/pdf, 111 pages)
Captions
Summary[edit]
A comparison of high-latitude ionosphere propagation predicitions from AMBCOM with measured data ( ) | ||
---|---|---|
Author |
Wilson, David J. |
|
Title |
A comparison of high-latitude ionosphere propagation predicitions from AMBCOM with measured data |
|
Publisher |
Monterey, California. Naval Postgraduate School |
|
Description |
This thesis examines the performance of SRI's Ambient Communications (AMBCOM) model for high latitude propagation prediction. It is one in a series of studies, conducted at the Naval Postgraduate School, to establish the relative merits of several computer-based propagation prediction models using a standard set of measured data. AMBCOM modeled the propagation path between a transmitter located in the polar cap region and several midlatitude receiver sites. Model predictions were matched to measured data obtained during two high- latitude communication experiments (campaigns). The absolute difference between model signal-to-noise ratio (SNR) and measured SNR was considered as error. Error statistics were accumulated to show the distribution of the error by campaign and frequency. The percentage, by frequency, of matched AMBCOM predictions in reference to total predictions for a given frequency was considered a measure of AMBCOM performance. AMBCOM exhibited small absolute values of average error, i.e., 7-11 dB, and high percentages of matched records. The average error was typically distributed between -20 and +20 dB. Unfortunately, these are only relative measures of model performance. The site antenna and environmental data used to model high latitude campaigns were estimated not measured, and some variation in AMBCOM results may be attributable to poor estimates. The measured data were not designed specifically for model validation, and further comparisons are needed with new measured data. Subjects: high latitude; ionosphere; AMBCOM; propagation modeling |
|
Language | English | |
Publication date |
March 1991 publication_date QS:P577,+1991-03-00T00:00:00Z/10 |
|
Current location |
IA Collections: navalpostgraduateschoollibrary; fedlink |
|
Accession number |
acomparisonofhig1094543734 |
|
Source | ||
Permission (Reusing this file) |
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted. |
Licensing[edit]
Public domainPublic domainfalsefalse |
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
|
||
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 06:48, 8 July 2020 | 1,275 × 1,650, 111 pages (3.65 MB) | Fæ (talk | contribs) | FEDLINK - United States Federal Collection acomparisonofhig1094543734 (User talk:Fæ/IA books#Fork8) (batch 1990-1992 #2803) |
You cannot overwrite this file.
File usage on Commons
The following page uses this file:
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Short title | A comparison of high-latitude ionosphere propagation predicitions from AMBCOM with measured data |
---|---|
Author | Wilson, David J. |
File change date and time | 00:51, 20 December 2013 |
Date and time of digitizing | 00:51, 20 December 2013 |
Date metadata was last modified | 00:51, 20 December 2013 |
Software used | Wilson, David J. |
Conversion program | |
Encrypted | no |
Page size |
|
Version of PDF format | 1.4 |