Search Results
The search returned 1,237 publication(s) on its.ntia.gov.
It is well known that the amplitude-probability distribution (APD) function of atmospheric radio noise can be closely represented by a curve that one can select from a family of curves by specifying the ratio of rms to average voltage, usually expres...
A bibliography is presented on the subject of electromagnetic wave propagation over line-of-sight paths through the troposphere at frequencies above 10 GHz. The references are divided into three main categories covering the areas of propagation throu...
The correlation of the man-made radio noise envelope voltage from two receiving systems was measured as a function of the antenna configuration of the systems. Combinations of vertical omnidirectional antennas and half-wave dipole antennas in corner...
This report presents a compilation and discussion of Hawaiʻi's telecommunications resources and requirements, and of the domestic satellite system applications in FCC Docket No. 16495. This information should be useful in the analysis and planning of...
The general problem is formulated to determine the optimum receiver structure and performance of a single-link operating in an electromagnetic environment of man-made interference consisting of J (≥ 1) other communication links, at or near the same ...
An analysis is presented of air-ground radio wave propagation measurements, which were performed using an airborne transmission source at approximately 6,400 m above msl. Receiving antennas were slightly within and beyond line-of-sight of the airbor...
Telecommunication technology and its applications are rapidly expanding in the new or developing nations, many of which are located in tropical climates; so a knowledge of the behavior of refractivity gradients, directly related to establishing and m...
This report summarizes measurements of tropospheric transmission loss and its long-term variability for nearly 800 paths in various parts of the world. The measurements were made at frequencies from 40 MHz to 10 GHz over distances which range from 1...
This is the fourth part of a four-part report containing tabulations and graphs of transmission loss data resulting from propagation experiments in the 230 - to 9200-MHz frequency range conducted over irregular terrain in Colorado. This part present...
During May and June of 1968, OT/ITS conducted a man-made radio noise survey of San Antonio, Texas. The results of part of this survey of residential urban man-made radio noise are given, along with the correlations of the measured values of noise pow...
Recently there has been increasing concern with the role high frequency (HF) communications will play in the telemetry subsystems for the National Data Buoy Systems (NDBS). This concern has been brought about by the rapidly changing state-of-the-art...
This report documents a digital computer program for computing the propagation of LF and VLF radio waves using the wave hop theory. It supersedes NBS Report 8889. The documentation includes a description of the physical model, detailed mathematical ...
This report documents the initial phase of work done on a study of telecommunications in Alaska in response to the impending sale of the federally owned Alaska Communication System to a commercial operator, RCA Alaska Communications, Inc. The study ...
A binary code that satisfies requirements for the Decision Information Distribution System (DIDS) is generated. Requirements for the code, procedure for generating such a code, and resulting code are described. Comparison with the theoretical bounds ...
This report tabulate s population data for the area surrounding 322 selected radio and television stations in the continental United States. Specifically, the population within 10, 20, 30, 40, 50, 60, and 70 miles is estimated. Associated rankings an...
A fixed-beam, bistatic CW experiment designed to measure the temporal statistics of the volume reflectivity produced by hydrometeors at several selected altitudes, scattering angles and at two frequencies (3.6 and 7.8 GHz) is described. Surface rain ...
The determination of an optimum receiving system for a given class of signals or how satisfactorily a given receiving system will operate requires information on the interference environment in which the system must operate. The important interferenc...
The subject computer programs are described and the FORTRAN source decks are Listed. The physical problem solved by the computer program is described. It allows an anisotropic ionospheric model, and variations in the model along the propagation path....
A computer based simulation model (Hatfield and Adams, 1970) was used to analyze the coverage obtained in the Command and Control and Arctic areas when transmitting CW and FAX from the U.S. Coast Guard’s Otis AFB, Cape Cod, Massachusetts facility. T...
The three sites selected by USCS as a result of Part 1 have been simulated in combination with the seven existing radio stations. The HF (4–22 MHz) predicted performance for all such combinations has been computed for the worst case propagation cond...