Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Your search returned 104 results.

Chriss A. Hammerschmidt; Robert T. Johnk, "Site Specific Propagation Model Development," 2019 IEEE International Symposium on Electromagnetic Compatibility, Signal & Power Integrity (EMC+SIPI), New Orleans, LA, July 2019, pp. 457-462

Propagation models are used to inform scientists and engineers on how radio propagation through an environment will affect the radio signal received on the other end of the link. Many propagation models have been developed: some are curve-fitting mod...

Anna E. Paulson, "Precision Geolocation of Propagation Data Using GPS and Data Fusion," 2019 IEEE International Symposium on Electromagnetic Compatibility, Signal & Power Integrity (EMC+SIPI), New Orleans, LA, July 2019, pp. 469-474

Geopositioning uncertainty degrades the usefulness of the data collected while conducting propagation measurements in the field. Researchers currently have access to highly detailed terrain, propagation, and locational data sets, but these data are u...

Chriss A. Hammerschmidt; Robert T. Johnk; Paul M. McKenna; Christopher R. Anderson, "Best Practices for Radio Propagation Measurements," NTIA Technical Memo TM-19-535, November 2018

This report describes a set of best practices for the preparation and verification of radio propagation measurement systems. We discuss advantages and disadvantages of various channel sounders, the common components used in these systems, and measure...

Chriss A. Hammerschmidt; Robert T. Johnk, "Extracting Clutter Metrics From Mobile Propagation Measurements in the 1755-1780 MHz Band," Proceedings of the 2016 IEEE Military Communications Conference, Baltimore, MD, November 1–3, 2016

This paper discusses mobile propagation measurement campaigns in San Diego, CA; Denver, CO; and Washington, D.C. These measurements were made to inform possible clutter models in the 1755-1780 MHz band. This band was recently auctioned and will now b...

Nicholas DeMinco; Robert Johnk; Paul M. McKenna; Chriss A. Hammerschmidt; J. Wayde Allen, "Free-Field Measurements of the Electrical Properties of Soil Using the Surface Wave Propagation Between Two Monopole Antennas," NTIA Technical Report TR-12-484, January 2012

This report describes one of three free-field radio frequency (RF) measurement systems that are currently being developed by engineers at the Institute for Telecommunication Sciences (NTIA/ITS). The objective is to provide estimates of the electrical...

Robert T. Johnk; John D. Ewan; Paul M. McKenna; Ronald L. Carey; Nicholas DeMinco, "Time–Domain Propagation Measurements of the NASA Space-Power Facility," NTIA Technical Report TR-10-471, September 2010

This report describes a recent measurement effort conducted by the Institute for Telecommunication Sciences at a chamber located at the NASA Space Power Facility (SPF) in Sandusky, Ohio. The report describes the chamber and the measurement system, an...

Robert T. Johnk; Peter Papazian; Paul M. McKenna; Nicholas DeMinco; Geoffrey A. Sanders; Heather E. Ottke, "A Mobile Propagation Measurement System," 2009 IEEE International Symposium on Electromagnetic Compatibility, Austin, TX, 17-21 Aug. 2009

This paper describes a mobile-to-mobile propagation measurement system that is currently being developed at the Institute for Telecommunication Sciences under the sponsorship of the Office of Spectrum Measurement. This system uses a fixed transmitter...

Nicholas DeMinco, "Propagation Loss Prediction Considerations for Close-In Distances and Low-Antenna Height Applications," NTIA Technical Report TR-07-449, July 2007

An investigation of different propagation modeling methods to meet the special requirements of a short-range propagation model with low antenna heights was performed, and has resulted in the development of approaches to be taken to accurately model r...

Peter B. Papazian; Michael G. Cotton, "Relative propagation impairments between 430 MHz and 5750 MHz for mobile communication systems in urban environments," NTIA Technical Report TR-04-407, December 2003

Radiowave propagation measurements made in an urban area of Denver, Colorado, are described. Wideband, impulse response measurements were made at 4 carrier frequencies from 420 MHz to 5750 MHz. Basic transmission loss slope and delay spread statistic...

Michael G. Cotton; Edward F. Kuester; Christopher L. Holloway, "An investigation into the geometric optics approximation for indoor propagation models," Radio Science, Vol. 37, No. 4, pp. 1-17, Jul.–Aug. 2002 doi: 10.1029/2000RS002508

In this study we investigated the geometric optics (GO) approximation to the fields of an infinitesimal electric dipole above a half plane for geometries typical of wireless indoor communications. This inspection was motivated by efforts to establish...

Peter B. Papazian; Perry F. Wilson; Michael G. Cotton; Yeh Lo, "Flexible Interoperable Transceiver (FIT) Program Test Range I: Radio Propagation Measurements at 440, 1360 and 1920 MHz Edwards Air Force Base, CA," NTIA Technical Report TR-00-380, October 2000

Radiowave propagation measurements at Edwards Air Force Base, CA are described. These measurements were made as part of the Flexible Interoperable Transceiver (FIT) Program. The objective of the measurements is to define communication link requiremen...

Peter B. Papazian; Perry F. Wilson; Michael G. Cotton; Yeh Lo, "Flexible Interoperable Transceiver (FIT) Program Test Range II: Radio Propagation Measurements at 440, 1360 and 1920 MHz, Ft. Hood, Texas," NTIA Technical Report TR-00-381, October 2000

Radiowave propagation measurements at Ft. Hood, Texas are described. These measurements were made as part of the Flexible Interoperable Transceiver (FIT) Program. The objective of the measurements is to define communication link requirements at 440, ...

This paper discusses the basic aspects of radio-wave propagation and antenna modeling in the medium frequency (MF) band. This band covers the frequencies of 300 to 3000 kHz. More specifically, we are concerned with the ground wave and the sky wave in...

Christopher L. Holloway; Michael G. Cotton; Paul M. McKenna, "A simplified model for predicting the power delay profile characteristics of an indoor radio propagation channel," NTIA Technical Report TR-98-353, August 1998

Multipath channels in indoor wireless communication systems exhibit a characteristic power delay profile, which can be a detriment to system performance. In this paper, we present a simplified model for calculating the decay rate of the power delay p...

Roger A. Dalke; George A. Hufford; Ronald L. Ketchum, "Radio propagation considerations for local multipoint distribution systems," NTIA Technical Report TR-96-331, August 1996

A local multipoint distribution system will essentially broadcast television signals (and perhaps more) to subscribers in small cells. It has been proposed to put such systems in the frequency band from 27.5 to 29.5 GHz where the wave length is only ...

Christopher L. Holloway; Patrick L. Perini; Ronald Delyser; Kenneth C. Allen, "A study of the electromagnetic properties of concrete block walls for short path propagation modeling," NTIA Technical Report TR-96-326, October 1995

For short propagation paths, correctly representing reflections of electromagnetic energy from surfaces is critical for accurate signal level predictions. In this paper, the method of homogenization is used to determine the effective material propert...

Hans J. Liebe; George A. Hufford; Michael G. Cotton, "Propagation Modeling of Moist Air and Suspended Water/Ice Particles at Frequencies Below 1000 GHz," AGARD Conference Proceedings 542: Atmospheric Propagation Effects through Natural and Man–Made Obscurants for Visible to MM–Wave Radiation, Presented at the Electromagnetic Wave Propagation Panel Symposium, held in Palma de Mallorca, Spain, 17th–20th May 1993

Propagation characteristics of the atmosphere are modeled for the frequency range from 1 to 1000 GHz (1 THz) by the modular millimeter–wave propagation model MPM. Refractivity spectra of the main natural absorbers (i.e., oxygen, water–vapor, suspende...

Jeffery Wepman; J. Randy Hoffman; Lynette H. Loew; Vincent S. Lawrence, "Comparison of wideband propagation in the 902-928 and 1850-1990 MHz bands in various macrocellular environments," NTIA Technical Report TR-93-299, September 1993

Impulse response measurements were taken simultaneously in both the 902-928 and 1850-1990 MHz bands using a wideband measurement system consisting of a fixed transmitter and a mobile receiver. Four different macrocells representing typical semi-rural...

Peter B. Papazian; Yeh Lo; Elizabeth E. Pol; Michael P. Roadifer; Thomas G. Hoople; Robert J. Achatz, "Wideband propagation measurements for wireless indoor communication," NTIA Technical Report TR-93-292, January 1993

Wideband impulse response measurements were made to characterize proposed radio data channels in three indoor environments. The measurement system employed a 1.5 GHz carrier which was biphase shift key (BPSK) modulated using a 100 Mb/s pseudo-random ...

Peter B. Papazian; David L. Jones; Richard H. Espeland, "Wideband propagation measurements at 30.3 GHz through a pecan orchard in Texas," NTIA Technical Report TR-92-287, September 1992

Wideband propagation measurements were made in a pecan orchard in Texas during April and August of 1990 to examine the propagation characteristics of millimeter–wave signals through vegetation. Measurements were made on tree obstructed paths with and...

Nancy A. Kuester, "Fading Allowance for Lower Decile SNR Calculations for HF Propagation Models," NTIA Technical Memo TM-92-153, January 1992

George A. Hufford; Francis K. Steele, "Tabulations of propagation data over irregular terrain in the 75- to 8400-MHz frequency range Part 5: Virginia," NTIA Technical Report TR-91-282, December 1991

This is a supplementary fifth part to a series of reports containing tabulations and graphs of transmission loss data resulting from propagation experiments which have emphasized the UHF frequency band. The first four reports described data taken in ...

Kenneth C. Allen, "A Model of Millimeter–Wave Propagation for Personal Communication Networks in Urban Settings," NTIA Technical Report TR-91-275, April 1991

Rapid development of personal, portable, radio communications is expected during this decade. A primary example of this is the emergence of personal communication networks (PCN). These networks are similar to today's cellular telephone technology. Ho...

Long–Term Performance and Propagation Measurements on Single and Tandem Digital Microwave Transmission Links Volume I: Analysis of Measurement Data

James A. Hoffmeyer; Timothy J. Riley, "Long–Term Performance and Propagation Measurements on Single and Tandem Digital Microwave Transmission Links, Volume II: Appendixes," NTIA Technical Report TR-90-265-2, June 1990

Long–Term Performance and Propagation Measurements on Single and Tandem Digital Microwave Transmission Links Volume II: Appendixes

Long–Term Performance and Propagation Measurements on Single and Tandem Digital Microwave Transmission Links Volume III: Twelve–Month Network and Link–Characterization Results

George A. Hufford; Hans J. Liebe, "Millimeter–Wave Propagation in the Mesosphere," NTIA Technical Report TR-89-249, September 1989

At heights between 30 and 100 km above Earth, the oxygen absorption lines near 60 GHz together with the geomagnetic field cause the atmosphere to become an anisotropic medium. This report discusses why this is so and how to compute the consequent eff...

William E. Frazier, "Handbook of Radio Wave Propagation Loss. Part 2 (100–20,000 MHz)," NTIA Handbook HB-89-242, April 1989

This handbook is intended to provide estimates of radio wave propagation loss between transmitting and receiving antennas of various heights and transmission frequencies above the assumed smooth–earth surface calculated using the NLAMBDA computer mod...

E. J. Violette; R. H. Espeland; Kenneth C. Allen, "Millimeter–Wave Propagation Characteristics and Channel Performance for Urban–Suburban Environments," NTIA Technical Report TR-88-239, December 1988

Measurements were performed in an urban–suburban environment with narrowband and wideband rf probes, which include millimeter–wave frequencies, in order to study propagation characteristics for street level paths. The primary objective of this report...

John Lemmon; Timothy J. Riley, "Propagation and Performance Measurements Over the Berlink–Bocksberg Digital Troposcatter Communications Link," NTIA Technical Report TR-88-232, March 1988

This report discusses propagation and performance measurements that were opbtained over a digital troposcatter communication link between Bocksber, West Germany and West Berlin. The measurements were unusual because three gerneral types of data were ...

George A. Hufford, "A General Theory of Radio Propagation Through a Stratified Atmosphere," NTIA Technical Report TR-87-219, July 1987

When wave propagation through a stratified atmosphere is formulated in operator theoretic terms, it becomes evident that the problem does not follow the guide of the usual examples of mathematical physics. Nevertheless, such a formulation is useful t...

Jerry D. Hopponen; Hans J. Liebe, "A Computational Model for the Simulation of Millimeter–Wave Propagation Through the Clear Atmosphere," NTIA Technical Report TR-86-204, October 1986

Prediction of propagation effects (i.e., path attenuation, phase delay, ray bending and medium noise) over the 1 to 300 GHz frequency range through the clear, nonturbulent atmosphere is accomplished by combining a spectroscopic data base with a compu...

Evan J. Dutton, "Effects of Drop–Size Distribution and Climate on Millimeter–Wave Propagation Through Rain," NTIA Technical Report TR-86-201, August 1986

The distribution of raindrop sizes in a given volume of air remains an unknown aspect of critical importance to the prediction of rain attenuation at millimeter–wave frequencies. Thus, in this report, the search continues for a methodology of predict...

E. J. Violette; R. H. Espeland; Gregory R. Hand, "Millimeter–Wave Urban and Suburban Propagation Measurements Using Narrow and Wide Bandwidth Channel Probes," NTIA Technical Report TR-85-184, November 1985

Measurements reported are part of a study of propagation characteristics for millimeter–wave communication links operating in an urban#8211;suburban environment. Absorption data were collected for signals propagated through some common building mater...

Hans J. Liebe, "An updated model for millimeter wave propagation in moist air," Radio Science, Volume 20, Number 5, Pages 1069- 1089, September- October 1985

A practical atmospheric Millimeter-Wave Propagation Model (MPM) is formulated that predicts attenuation. delay, and noise properties of moist air for frequencies up to 1000 GHz. Input variables are height distributions (0-30 km) of pressure, temperat...

Hans J. Liebe; Kenneth C. Allen; Gregory R. Hand; Richard H. Espeland; E. J. Violette, "Millimeter–Wave Propagation in Moist Air: Model Versus Path Data," NTIA Technical Report TR-85-171, March 1985

A practical atmospheric millimeter-wave propagation model (MPM) is updated and tested with experimental data from horizontal, line–of–sight links when there is no precipitation. The MPM computer program predicts attenuation and delay properties of mo...

William E. Frazier, "Handbook of Radio Wave Propagation Loss (100-10,000 MHz)," NTIA Handbook HB-84-165, December 1984

This handbook is intended to assist in manual analysis techniques that must be used when an automated analysis is not possible. It provides estimates of radio wave propagation loss between transmitting and receiving antennas above the assumed smooth-...

Evan J. Dutton; Francis K. Steele, "Some Further Aspects of the Influence of Raindrop–Size Distributions on Millimeter–Wave Propagation," NTIA Technical Report TR-84-169, December 1984

In the presence of rain, millimeter–wave propagation is acutely sensitive to the distribution of raindrop sizes along a given propagation link. This report analyzes the variability of rain attenuation prediction at microwave/millimeter wave frequenci...

Jean E. Adams; J. C. Carroll; E. A. Costa; Donald R. Ebaugh Jr.; John R. Godwin; Eldon J. Haakinson; Donald H. Layton; Darren L. Smith, "Measurements and Predictions of HF Ground Wave Radio Propagation Over Irregular, Inhomogeneous Terrain," NTIA Technical Report TR-84-151, July 1984

Measurements of radio propagation path loss were made over four paths in the 3 to 30 MHz band. The paths were of lengths up to 45 km in the Boulder, CO, area. They ranged from smooth to mountainous terrain, from open areas with few or no man-made str...

Hans J. Liebe, "An Atmospheric Millimeter Wave Propagation Model," NTIA Technical Report TR-83-137, December 1983

The neutral atmosphere is characterized for the frequency range from 1 to 300 GHz as a nonturbulent propagation medium. Attenuation and propagation delay effects are predicted from meteorological data sets: pressure, temperature, humidity, suspended ...

G. D. Gierhart; M. E. Johnson, "The IF-77 Electromagnetic Wave Propagation Model," NTIA Sponsor Report DOT/FAA/ES-83/3, September 1983

This report provides a description of the computational details in the IF-77 (ITS-FAA-1977) radio wave propagation model. The IF-77 model is useful in estimating service coverage for radio systems operating in the 0.1 to 20 GHz frequency range. It is...

E. J. Violette; Richard H. Espeland; Kenneth C. Allen, "A Diagnostic Probe to Investigate Propagation at Millimeter Wavelengths," NTIA Technical Report TR-83-128, August 1983

A diagnostic probe used to fully describe the propagation characteristics of a millimeter wave channel by nearly simultaneous recording of an impulse response, frequency spectra, amplitude response, and bit error rate is discussed. A 30.3 GHz carrier...

Frank G. Stewart; Leslie A. Berry; Charles M. Rush; Vaughn Agy, "An Air–to–Ground HF Propagation Prediction Model for Fast Multicircuit Computation," NTIA Technical Report TR-83-131, August 1983

A radio propagation prediction computer code has been developed to permit rapid simulation of HF air–to–ground telecommunication circuits. This prediction program provides estimates of both skywave and groundwave HF propagation parameters. The skywav...

D. A. Hill, "HF Ground Wave Propagation Over Forested and Built-up Terrain," NTIA Technical Report TR-82-114, December 1982

An integral equation method is presented for computing the vertically polarized field strength over irregular terrain which is covered with forest, buildings, or snow. The terrain cover is modeled as an equivalent slab, and a general computer code, W...

Lewis E. Vogler, "Comparisons of Observed Propagation Loss with Predictions from Multiple Knife-Edge Attenuation," NTIA Technical Report TR-82-108, November 1982

Comparisons of theoretical attenuation based on multiple knifeedge diffraction with measured values of median propagation loss are presented for a number of different propagation paths. In general the knife-edge predictions tend to overestimate recei...

The burning of an Atlas-Centaur rocket in the ionospheric F–region was used to determine the extent of HF propagation anomalies associated with the resultant drop in ionospheric electron content. This "ionospheric hole" grew to encompass the control ...

Evan J. Dutton; Francis K. Steele, "Bibliography and Synopsis of Literature Concerned with Microwave and Millimeter Wave Propagation Effects," NTIA Technical Report TR-82-107, September 1982

This report presents an extensive bibliography, categorized by effect, of radio propagation through the atmosphere, for the frequency region of 10 to 300 GHz. Preceding the bibliographic presentation is an article-by-article synopsis of that literatu...

Eldon J. Haakinson; E. J. Violette; George A. Hufford, "Propagation Effects on an Intervisibility Measurement System Operating in the SHF Band," NTIA Technical Report TR-80-35, February 1980

A study was conducted to determine the limiting propagation effects on the performance of a microwave system that could be used to detect the optical visibility between two vehicles, separated by up to 10 km, in irregular, obstructed terrain. The stu...

M. E. Johnson; G. D. Gierhart, "Comparison of Measured Data with IF-77 Propagation Model Predictions," NTIA Sponsor Report FAA-RD-79-9, August 1979

his report provides extensive comparisons of measured propagation data with predictions made by the IF-77 (ITS-FAA-77) and other propagation models. Although IF-77 was developed for aeronautical applications, it can be used for some point-to-point pr...

R. H. Ott; Lewis E. Vogler; George A. Hufford, "Ground Wave Propagation Over Irregular, Inhomogeneous Terrain: Comparisons of Calculations and Measurements," NTIA Technical Report TR-79-20, May 1979

An algorithm (PROGRAM WAGNER) that evaluates HF ground–wave attenuation over irregular, inhomogeneous terrain is used to compare calculated field strengths with observed measurements for 9 actual paths and frequencies ranging from 120 kHz to 50 MHz. ...

William A. Kissick; Eldon J. Haakinson; G. H. Stonehocker, "Measurements of LF and MF Radio Propagation over Irregular, Inhomogeneous Terrain," NTIA Technical Report TR-78-12, November 1978

Measurements of radio propagation path loss and local ground conductivity were made over four paths in the 100 to 2000 kHz band. The paths were of lengths up to 50 km and were chosen to represent both extreme and typical topography and conductivity c...

M. E. Johnson; G. D. Gierhart, "Aerospace Propagation Prediction Capabilities Associated with the IF-77 Model," Conference Proceedings: Operational Modelling of the Aerospace Propagation Environment, North Atlantic Treaty Organization (NATO), Advisory Group for Aerospace Research and Development (AGARD), Neuilly-sur-Seine (France), November 1978, Vol. 2, No. 238

The United States Department of Commerce (DOC) has been active in radio wave propagation research and prediction for several decades, and has provided the Federal Aviation Administration (FAA) with many propagation predictions relevant to the coverag...

Anita G. Longley, "Radio Propagation in Urban Areas," NTIA Technical Report OT-78-144, April 1978

This report reviews much of the earlier work on radio propagation in urban areas, including a good deal of data from measurement programs, careful studies of multipath propagation, and techniques to reduce multipath fading. A number of investigators ...

M. E. Johnson; G. D. Gierhart, "Applications Guide for Propagation and Interference Analysis Computer Programs (0.1 to 20 GHz)," NTIA Sponsor Report FAA-RD-77-60, March 1978

This report covers ten computer programs useful in estimating the service coverage of radio systems operating in the frequency band from 0.1 to 20 GHz. These programs may be used to obtain a wide variety of computer-generated microfilm plots such as ...

H. T. Dougherty; B. A. Hart, "Anomalous Propagation and Interference Fields," NTIA Technical Report OT-76-107, December 1976

This report presents some estimates of the enhanced fields deduced from the presently available theory and observational data. The fields of interest are the enhanced fields that are encountered in the presence of the stratified atmosphere, the ducti...

Ernest K. Smith, "World Maps of Sporadic E (foEs > 7 MHz) for Use in Prediction of VHF Oblique-Incidence Propagation," NTIA Special Publication OT-SP-76-10, June 1976

Anita G. Longley; George A. Hufford, "Sensor Path Loss Measurements Analysis and Comparison with Propagation Models," NTIA Technical Report OT-75-74, October 1975

The data from a large measurement program at VHF and UHF are carefully evaluated , summarized and compared with values predicted from models of radio propagation over irregular terrain. Particular problems of low antennas and the effects of vegetatio...

George A. Hufford, "Radio propagation to the offshore extended area," NTIA Technical Memo OT TM 75 196, April 1975

The extended offshore test range proposed for the Pacific Missile Range will use high altitude aircraft to relay signals for tracking, telemetry, and control. This report treats the reliability of the radio propagation paths between these relays and ...

Evan J. Dutton; Charles J. Chilton, "Modeling propagation effects for an advanced phased-array radar system," NTIA Technical Memo OT TM 75 195, March 1975

A theoretical expression for the received signal by a radar is reduced to a utilitarian form by the introduction of feasible first order approximations, and specifying where other common assumptions are made, with concern expressed for the need for e...

R. H. Ott; James R. Wait, "A first approach to the propagation of lateral waves in an inhomogeneous jungle," NTIA Technical Memo OT TM 73 154, November 1974

Estimates for the effects on a lateral wave of a clearing in a foliage layer are considered. A first-order solution to the integral equation for the mixed-path problem is derived and two examples are considered. They show that a m.id-path clearing ha...

HF radio propagation predictions are calculated for Voice of America circuits using the OT/ITS prediction program. Some of the parameter s given are maximum usable frequency (MUF), the optimum traffic fre­quency (FOT), the lowest useful frequency (LU...

VOLUME I: HF radio propagation predictions are calculated for Voice of America circuits using the OT/ITS prediction program. Some of the parameters given are maximum usable frequency, the optimum traffic frequency, the lowest useful frequency, availa...

H. T. Dougherty, "Propagation assessment for FACSFAC links San Clemente Is./Pt. Lorna and North Is./ Imperial Beach," NTIA Technical Memo OT TM 74 164, May 1974

This report reviews the available documentation for two links of the FACSFAC microwave system and the findings of on-site inspections. It is recommended that the present maintenance program be supplemented by additional performance monitoring. This s...

HF radio propagation predictions are calculated for 35 circuits from the Voice of America transmitting facility at Tinang, P. I. and 30 circuits from their facility at Kava1a, Greece, using the OT/ITS prediction program. The program selects the optim...

HF radio propagation predictions are calculated for 35 circuits from the Voice of America transmitting facility at Tinang, P. I. and 30 circuits from their facility at Kavala, Greece, using the OT/ITS prediction program. The program selects the optim...

HF radio propagation predictions are calculated for Voice of America circuits using the OT/ITS prediction program. Some of the parameters given are maximum usable frequency, the optimum traffic frequency, the lowest useful frequency, available signal...

HF radio propagation predictions are calculated for Voice of America circuits using the OT/ITS prediction program. Some of the parameters given are maximum usable frequency, the optimum traffic frequency, the lowest useful frequency, available signal...

HF radio propagation predictions are calculated for 35 circuits from the Voice of America transmitting facility at Tinang, P. I. and 30 circuits from their facility at Kava1a, Greece, using the OT/ITS prediction program. The program selects the optim...

VOLUME I: HF radio propagation predictions are calculated for Voice of America circuits using the OT/ITS prediction program. Some of the parameters given are maximum usable frequency, the optimum traffic frequency, the lowest useful frequency, availa...

HF radio propagation predictions are calculated for Voice of America circuits using the OT/ITS prediction program. Some of the parameters given are maximum usable frequency (MUF), the optimum traffic fre­quency (FOT), the lowest useful frequency (LUF...

HF radio propagation predictions are calculated for Voice of America circuits using the OT/ITS prediction program. Some of the parameters given are maximum usable frequency (MUF), the· optimum traffic fre­quency (FOT), the lowest useful frequency (LU...

HF radio propagation predictions are calculated for circuits from the Voice of America transmitting facility at Tinang, P. I. and 25 circuits from their facility at Kavala, Greece, using the OT/ITS prediction pro­gram. The program selects the optimum...

HF radio propagation predictions are calculated for 35 circuits from the Voice of America transmitting facility at Tinang, p. I. and 30 circuits from their facility at Kavala, Greece, using the OT/ITS prediction pro­gram. The program selects the opti...

G. D. Gierhart; Albrecht P. Barsis; M. E. Johnson; Evelyn M. Gray; F. M. Capps, "Analysis of Air-ground Radio Wave Propagation Measurements at 800 MHz," NTIA Technical Report OT/TRER 21, November 1971

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 airborn...

P. L. McQuate; John M. Harman; M. E. McClanahan, "Tabulations of Propagation Data over Irregular Terrain in the 230 to 9200 MHz Frequency Range Part 4: Receiver Site in Grove of Trees," NTIA Technical Report OT/TRER 19, July 1971

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 presents...

Leslie A. Berry; J. E. Herman, "A Wave Hop Propagation Program for an Anisotropic Ionosphere," NTIA Technical Report OT/ITS RR 11, April 1971

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 f...

Leslie A. Berry; R. Michael Jones, "A time-varying electron density model for LF/VLF propagation calculations,," NTIA Technical Memo OT ITSTM 3, October 1970

Published measured profiles of the lower ionosphere are used as the basis of an analytic model of the D-region electron density which varies with the sun’s zenith angle. The model is the sum of an exponential layer and a daytime Chapman-like C-layer....

M. E. McClanahan; Albrecht P. Barsis, "Tabulations of Propagation Data Over Irregular Terrain in the 230- to 9200-MHz Frequency Range Part 3: North Table Mountain-Golden," NTIA Technical Report ERL 65-ITS 58-3, July 1970

This is the third 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 describes...

Anita G. Longley; R. K. Reasoner, "Comparison of Propagation Measurements with Predicted Values in the 20 to 10,000 MHz Range," NTIA Technical Report ERL 148-ITS 97, January 1970

Predictions of tropospheric transmission loss over irregular terrain using the computer methods described by Longley and Rice (1968) are compared with measurements, to determine their limits of applicability and define the boundary conditions for the...

A computer program. for calculating ground wave propagation in an ionized atmosphere is documented and listed. The conductivity of the atmosphere can vary in an arbitrary way with altitude. The notion of continuous stratification of the profile has b...

F. George Kimmett; Larry G. Hause; P. L. McQuate, "UHF propagation measurements from elevated to buried antennas," NTIA Technical Memo ER LTM ITS 210, December 1969

This report describes many of the UHF propagation characteristics between aircraft or satellites and buried antennas. A vertical monopole was used as a reference antenna, and the propagation characteristics of an annular slot and other antennas, omni...

Larry G. Hause; F. George Kimmett; John M. Harman, "UHF Radio Propagation Data for Low Antenna Heights Volume I," NTIA Technical Report ERL 134 ITS 93-1, November 1969

This report is a presentation in two volumes of measurement techniques, data, comparisons, and conclusions obtained from a UHF propagation measurement program at 230 and 415.9 MHz. Antenna heights were 3 m or less above ground. Vertical polarization ...

Larry G. Hause; F. George Kimmett; John M. Harman, "UHF Radio Propagation Data for Low Antenna Heights Volume II," NTIA Technical Report ERL 134 ITS 93-2, November 1969

This report is a presentation in two volumes of measurement techniques, data, comparisons, and conclusions obtained from a UHF propagation measurement program at 230 and 415.9 MHz. Antenna heights were 3 m or less above ground. Vertical polarization ...

G. D. Gierhart; M. E. Johnson, "Effects of security fences on VHF/UHF propagation," NTIA Technical Memo ERLTM ITS 196, August 1969

A method of estimating the basic transmission loss, Lb, for VHF/UHF links that have low or buried antennas surrounded by security fences is presented, Estimates of Lb obtained are compared with experimental data.

P. L. McQuate, "Propagation measure­ments on two line-of-sight paths in Germany," NTIA Technical Memo ERL TM ITS 192, August 1969

Received signal level recording on two long line-of-sight paths with a common terminal showed that a relatively steep path elevation angle will not eliminate occasional deep fading. Most of the deeper fading occurred during periods of weak winds when...

George A. Hufford, "UHF Propagation from Buried Antennas," NTIA Technical Memo ERLTM-ITS 191, July 1969

This paper poses, and attempts to answer, some of the questions involved when a UHF antenna is buried in the ground. A description of the basic theory is given, together with illustrative calculations for many situations of interest. Graphs are prese...

John R. Juroshek, "Analysis of a propagation channel for a digital communication system," NTIA Technical Memo ERL TM ITS 218, January 1969

A hypothetical aircraft-to-ground communication channel is examined for frequencies in the 2 -30 MHz band, and in the 200 -400 band. The channel is characterized by its correlation function and scatter function. Particular attention is given to the e...

P. L. McQuate; John M. Harman; M. E. Johnson; Albrecht P. Barsis, "Tabulations of Propagation Data Over Irregular Terrain in the 230 to 9200 MHz Frequency Range Part 2: Fritz Peak Receiver Site," NTIA Technical Report ERL 65-ITS 58-2, December 1968

This is the second 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 describes...

P. L. McQuate; John M. Harman; Albrecht P. Barsis, "Tabulations of Propagation Data over Irregular Terrain in the 230 to 9200 MHz Frequency Range Part 1: Gunbarrel Hill Receiver Site," NTIA Technical Report ERL 65-ITS 58, March 1968

This four-part report contains tabulations and graphs of transmission loss data resulting from propagation experiments in the 230 to 9200 MHz range conducted over irregular terrain in Colorado. Each part of the report deals with data obtained at a si...

M. E. Johnson; Martin J. Miles; P. L. McQuate; Albrecht P. Barsis, "Tabulations of VHF Propagation Data Obtained Over Irregular Terrain at 20, 50, and 100 MHz Part 3: Ohio Data," NTIA Technical Report IER 38-ITSA 38-3, December 1967

This report contains tabulations of transmission loss data resulting from propagation experiments at 20, 50, and 100 MHz conducted over irregular and partly wooded terrain in northeastern Ohio. Raw data from measurements described in this report is a...

R. K. Salaman; Larry G. Hause, "Communications Task ­a study of propagation and noise for advanced ICBM weapons systems, Vol. IV Test Plan (Appendix 6)," NTIA Technical Memo RL TM ITS 110, December 1967

This final report contains the results of an extensive study program, the development of a method for evaluating candidate communication systems, and the design of a test plan to supplement the information from the study program and provide realistic...

R. E. Skerjanec, "An interim report on nanosecond pulse propagation over line-of-sight paths," NTIA Technical Memo IER TM ITSA 92, October 1967

During October and November 1966, propagation measurements were made on two-line-of-sight paths between the islands of Maui and Hawaii, utilizing paths of a nominal I-ns width at a carrier frequency of approxi­mately 9 GHz. Prime objective was to det...

M. E. Johnson; Martin J. Miles; P. L. McQuate; Albrecht P. Barsis, "Tabulations of VHF Propagation Data Obtained Over Irregular Terrain at 20, 50, and 100 MHz Part 2: Colorado Mountain Data," NTIA Technical Report IER 38-ITSA 38-2, August 1967

This report contains tabulations of transmission loss data resulting from propagation experiments at 20, 50, and 100 MHz conducted over irregular terrain in the Colorado Mountains primarily east of the Continental Divide.Raw data from measurements de...

M. E. Johnson; Martin J. Miles; P. L. McQuate; Albrecht P. Barsis, "Tabulations of VHF Propagation Data Obtained Over Irregular Terrain at 20, 50, and 100 MHz," NTIA Technical Report IER 38-ITSA 38, May 1967

This report contains tabulations of transmission loss data resulting from propagation experiments at 20, 50, and 100 MHz conducted over irregular terrain in the Colorado high plains east of the Continental Divide.Raw data from measurements described ...

Leslie A. Berry, "Radio Propagation over a Gaussian Shaped Hill," NTIA Technical Memo IER TM ITSA 41, February 1967

The propagation factor for wave propagation over an impedance surface containing irregularities large compared to a wavelength is the solution of a certain integral equation. The equation is solved numerically for the special case of a two-dimension...

John S. Nicolis; Carolen Moncure, "Calculation of electrical length variations and focusing-defocusing due to tropospheric layers in microwave propagation," NTIA Technical Memo IER TM ITSA 39, January 1967

Numerical results concerning the disturbances caused by a typical category of slightly subrefractive or superrefractive thick tropospheric layers in line-of-sight propagation as well as the importance of total reflection from such layers. These refle...

Albrecht P. Barsis, "Long-Distance Tropospheric Propagation Data over Cheyenne Mountain Paths," NTIA Technical Report NBS Report 5072, May 1957

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...

Albrecht P. Barsis; Richard C. Kirby, "Long Distance Tropospheric Propagation Measurements between North Africa and Spain," NTIA Technical Report NBS Report 5067, December 1956

The Radio Propagation Engineering Division of the National Bureau of Standards undertook a study of propagation conditions in the VHF and UHF band over a 200 mile path between Morocco and Southern Spain. The study provides estimates of power requirem...

Richard C. Kirby, "The Extreme Range of Regular Propagation of VHF Radio Waves by Ionospheric Scattering," NTIA Technical Report NBS Report 3554, June 1955

Initial results through December 1954 are reported from a continuing investigation of the extreme distance range of regular VHF propagation by scattering in the lower ionosphere. Signal strength observed at 36/Mc/s over an experimental path from New...

Albrecht P. Barsis; B. R. Bean; K. O. Hornberg, "Cheyenne Mountain Tropospheric Propagation Data February - March 1954," NTIA Technical Report NBS Report 3536, May 1955

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 ...

Albrecht P. Barsis; B. R. Bean; J. W. Herbstreit; K. O. Hornberg; Kenneth A. Norton, "Propagation of Radio Waves over Land at 1046 Mc (Report for the Air Navigation Development Board)," NBS Report 2494, May 1953

The Air Navigation Development Board asked the Central Radio Propagation Laboratory to investigate radio wave propagation in the 960-1600- Mc frequency banned. A primary focus was assessment of the reliability of air-to-grounds communications or ra...

G. R. Chambers; J. W. Herbstreit; Kenneth A. Norton, "Preliminary Report on Propagation Measurements from 92-1046 Mc at Cheyenne Mountain, Colorado," NTIA Technical Report NBS Report 1826, July 1952

A description is given of the facilities provided by the National Bureau of Standards on Cheyenne Mountain in Colorado and in its vicinity which are used for the measurement of the transmission loss on radio transmission circuits operated in the freq...

George A. Hufford, "An Integral Equation Approach to the Problem of Wave Propagation over an Irregular Surface," NTIA Technical Report CRPL-6-2, February 1951

In this paper there is derived an approximate formulation of the problem of a scalar wave propagated over an irregular bounding surface. This formulation takes the form of a one-dimensional Volterra integral equation, which can, or so it appears, be...

Central Radio Propagation Laboratory, "Basic Radio Propagation Predictions for June 1947 Three Months In Advance," NTIA Technical Report CRPL-D-31, March 1947

Basic Radio Propagation Predictions are prepared by the staff of the Central Radio Propagation Laboratory of the National Bureau of Standards under the direction of J. Howard Dellinger, Chief, and Newbern Smith, Assistant Chief. The monthly reports o...