Search Results
The search returned 1,243 publication(s) on its.ntia.gov.
Objective: To develop the concept for a system which will provide the Naval communication a capability for the selection of best operating frequencies for Navy HF circuits; and for predicting the time of onset, the intensity and duration of ionosphe...
This is the fourth in a series of bibliographies being prepared by the M & GA staff of the American Meteorological Society for the Boulder Laboratories of the National Bureau of Standards. The first three were: 1. Bibliography on Ionospheric Pro...
Central Radio Propagation Laboratory Ionospheric Predictions Based on Numerical Methods of Mapping (formerly CRPL-D series) is described. The Gallet-Jones method of numerical mapping, which is the basis of these predictions, is briefly described. Us...
The proposed experiments described in this report are designed to obtain information concerning the feasibility of tropospheric scatter transmission between an earth terminal and a satellite. These experiments are suggested in lieu of experiments ut...
Radio system parameters are combined with geophysical and ionospheric characteristics to predict the performance of high frequency sky-wave communication circuits through the use of electronic computers. A program is presented to compute Maximum Usa...
The measurements described in this report were sponsored by the U. S. Army Signal Research and Development Laboratory, Fort Monmouth, New Jersey. During the 1961–1962 school year the Midwest Program on Airborne Television Instruction, Inc. (MPATI) t...
Measurements of the effects of inserting a brick wall into a radio propagation path are reported. The technique used for measuring “insertion loss” at frequencies of 518 Mc/s and 1046 Mc/s is described. Distributions of the resulting data indicate t...
This report deals with the prediction of service volumes (i.e., service ranges in three dimensions) for VOR and TACAN air navigation facilities in the presence of noise and interfering stations. Propagation mechanisms applicable to the frequency ran...
This report provides information about research projects conducted at the National Bureau of Standards Department of Commerce Boulder Laboratories in FY 1961 by the Cryogenic Engineering Laboratory (CEL) and the Central Radio Propagation Laboratory (...
The radar for computing the signal-to-noise ratio of radar echoes from the sun is outlined in this report. The radial distribution of electron density in the corona, the coronal temperature, solar noise, galactic noise, and radar-system parameters a...
Comparison of published results of experimental antenna measurements, particularly gains, reveals apparent discrepancies of the order of one or more decibels. Experimental work at the National Bureau of Standards on scaled model antennas for long-ra...
A comparison is made at X-band frequencies of the theoretical and measured transmission and reflection coefficients for a parallel wire grid. The methods used are applicable to the measurement of these factors for various building materials.
Part I of this report describes a method for predicting the cumulative distribution with time of transmission loss at frequencies above 10 megacycles per second over paths of arbitrary length. The method makes use of available information about terr...
An attempt is made to list as completely as possible the papers and reports dealing with Arctic ionospheric radio propagation which have appeared since 1949. There are three categories into which these works fall: (a) papers in the “open” literature...
This is the sixth quarterly progress report on a study to obtain quantitative information on the additional attenuation suffered by radio waves traversing the auroral zone. For many years it has been known that ionospheric radio wave propagation in ...
Results of measurements of basin transmission loss over 400 and 600 miles paths are presented in the form of distributions of hourly medians for frequencies in the 100 to 1000 Mc range. The paths extend southeastward from the Front Range of the Colo...
A solution is presented in this paper, with all of the variable subject to error, for the general leased squares porblem of determining consistent estimates of the parameters of a functional relationship which is expected to fit exactly the average o...
A discussion is given of the transmission loss expected in free space with various types of antennas, followed by a description of theoretical prediction curves for the transmission loss expected in tropospheric propagation on over-land paths. The B...
This report describes tropospheric propagation measurements taken over the Cheyenne Mountain paths on frequencies between 92 and 1046 Mc during February, 1954. The results of the measurements are given in terms of cumulative distributions of hourly ...
The National Bureau of Standards has established extensive facilities for studies of tropospheric radio-wave propagation in the very-high frequency and ultra-high frequency portion of the frequency spectrum at Cheyenne Mountain, Colorado. These faci...