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Author : R. H. Ott
Publisher :
ISBN 13 :
Total Pages : 146 pages
Book Rating : 4.3/5 (91 download)
Download or read book Ground Wave Propagation Over Irregular, Inhomogeneous Terrain written by R. H. Ott and published by . This book was released on 1979 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. H. Ott
Publisher :
ISBN 13 :
Total Pages : 137 pages
Book Rating : 4.:/5 (897 download)
Download or read book Ground Wave Propagation Over Irregular Inhomogeneous Terrain written by R. H. Ott and published by . This book was released on 1979 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. H. Ott
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (123 download)
Download or read book Ground Wave Propagation Over Irregular, Inhomogeneous Terrain :. written by R. H. Ott and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gordon J. Fulks
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (227 download)
Download or read book HF Ground Wave Propagation Over Smooth and Irregular Terrain written by Gordon J. Fulks and published by . This book was released on 1981 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report addresses several aspects of ground wave propagation. Included are discussions of the general characteristics of ground waves as well as specific formulas for predicting ground wave field strengths at arbitrary locations from a standard transmitter. These formulas, from the work of Bremmer, apply to either vertical or horizontal polarization, to a smooth spherical earth, and to a wide variety of soil types. A computer program to evaluate the formulas is presented and sample results are given. Although this report concentrates on HF frequencies, many of the results are applicable to a much wider range of frequencies. Atmospheric refraction, which may enhance ground wave propagation, is discussed. Formulas for predicting refraction effects based on atmospheric temperature and humidity as well as temperature and humidity gradients are presented. Propagation over inhomogeneous and irregular terrain is considered. Only limited aspects of such propagation are discussed with an emphasis on irregular terrain. Obstacle gain is covered in some detail. Because of the lack of experimental data for ground wave propagation over irregular terrain at HF frequencies, an experiment is recommended. (Author).
Author : R. H. Ott
Publisher :
ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.0/5 ( download)
Download or read book A New Method for Predicting HF Ground Wave Attenuation Over Inhomogeneous, Irregular Terrain written by R. H. Ott and published by . This book was released on 1971 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.:/5 (115 download)
Download or read book Measurements and Predictions of HF Ground Wave Radio Propagation Over Irregular, Inhomogeneous Terrain written by and published by . This book was released on 1984 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.:/5 (115 download)
Download or read book Measurements and Predictions of HF Ground Wave Radio Propagation Over Irregular, Inhomogeneous Terrain written by and published by . This book was released on 1984 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James Smith Finnie
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (62 download)
Download or read book Prediction of Ground-wave Radio Propagation Over Irregular Inhomogeneous Terrain written by James Smith Finnie and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. Ralph Johler
Publisher :
ISBN 13 :
Total Pages : 84 pages
Book Rating : 4.0/5 ( download)
Download or read book Loran-D Phase Corrections Over Inhomogeneous, Irregular Terrain written by J. Ralph Johler and published by . This book was released on 1967 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. Ralph Johler
Publisher :
ISBN 13 :
Total Pages : 64 pages
Book Rating : 4.0/5 ( download)
Download or read book Loran-C, D Phase Corrections Over Irregular, Inhomogeneous Terrain written by J. Ralph Johler and published by . This book was released on 1969 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kenneth Alva Norton
Publisher :
ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (88 download)
Download or read book Ground Wave Propagation Over Irregular Terrain at Frequencies Above 50 Mc written by Kenneth Alva Norton and published by . This book was released on 1949 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rayner K. Rosich
Publisher :
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.3/5 (129 download)
Download or read book Attenuation of High-frequency Ground Waves Over an Inhomogeneous Earth written by Rayner K. Rosich and published by . This book was released on 1970 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective of this study was to obtain theoretical estimates of the effect of inhomogeneities in the earth's surface upon ground-wave propagation along a particular set of land-sea paths.The results were obtained by numerically solving the integral equation [equation],where f* is the attenuation function for the inhomogeneous case, f is the Sommerfeld function, and g is obtained essentially from the spherical Green's function by a steepest-descent type integration. Sharp phase and amplitude changes in the attenuation function occur when crossing an "island" or inhomogeneity in the paths. The greater the difference in conductivity and dielectric constant between the island and the rest of the path, the greater are these changes. Also noted is the "recovery'' or "focusing" effect found in the amplitude and phase. The effect of moving the transmitting antenna across a coastline was also studied and the results were quite similar to the above. Computations were performed for three paths at frequencies of 10, 15, 20, and 25 MHz. The results are displayed in tabular and graphical form. This report is a revised and updated version of an earlier study (Rosich, 1968) which is now out of print.
Author : William A. Kissick
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.3/5 (91 download)
Download or read book Measurements of LF and MF Radio Propagation Over Irregular, Inhomogeneous Terrain written by William A. Kissick and published by . This book was released on 1979 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. Ralph Johler
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.0/5 ( download)
Download or read book Loran Radio Navigation Over Irregular, Inhomogeneous Ground with Effective Ground Impedance Maps written by J. Ralph Johler and published by . This book was released on 1971 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rama Janaswamy
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (827 download)
Download or read book Application of the Measured Equation of Invariance to Wave Propagation Over Irregular Inhomogeneous Terrain written by Rama Janaswamy and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of propagation of electromagnetic waves over irregular, inhomogeneous terrain is solved by a finite difference scheme. The method is fast and requires considerably less memory compared to the integral equation methods. The method requires a storage space of order 0(N) and an execution time of order 0(N2). Fields generated by a TEz line source are represented in an integral form in terms of the field over a fiat, constant impedance plane, and the field scattered by the terrain irregularities and inhomogeneities. Accurate expressions are provided for the incident field and the Green's function, whose evaluation is otherwise accomplished by the rather time-consuming Sommerfeld's integrals. Measured equation of invariance is used to terminate the mesh. The sparse matrix generated by the method is inverted using Ricatti transform. Numerical results are presented for the ground wave as well as the sky wave. Comparison is made for known geometries to establish the validity and limitations of the method.
Author : J. Ralph Johler
Publisher :
ISBN 13 :
Total Pages : 64 pages
Book Rating : 4.3/5 ( download)
Download or read book Loran-C, D Phase Corrections Over Irregular, Inhomogeneous Terrain written by J. Ralph Johler and published by . This book was released on 1969 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of irregular, inhomogeneous terrain on ground wave propagation are treated by simplified methods that use the framework of classical ground wave theory. Roughness is introduced in the form of a ground surface impedance. Then, the irregular, inhomogeneous terrain can be taken into account if surface roughness can be described compactly as an impedance. Although the propagated electromagnetic waves arise from vertical antennas as transverse magnetic or TM waves, the irregularities of the ground give rise to transverse electric or TE waves. Losses into the TE propagation mode are considered implicitly in the analysis method for this paper. The theoretical technique is readily reduced to a digital computer program which uses the classical theory approach. This computer program can be used on comparatively small computers especially since it does not require the excessive computation time of the exact methods. The computer program can also calculate the smooth ground phase corrections. A surface wave was excited theoretically at 100 kHz, which may affect the Loran-C, D phase measurements in the presence of certain types of irregular terrain. Such terrain can be characterized by a uniform distribution of bosses of radius near one tenth of a wave length distributed approximately one in every three square kilometers.
Author : Rama Janaswamy
Publisher :
ISBN 13 :
Total Pages : 61 pages
Book Rating : 4.:/5 (827 download)
Download or read book Application of the Measured Equation of Invariance to Wave Propagation Over Irregular Inhomogeneous Terrain written by Rama Janaswamy and published by . This book was released on 1993 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of propagation of electromagnetic waves over irregular, inhomogeneous terrain is solved by a finite difference scheme. The method is fast and requires considerably less memory compared to the integral equation methods. The method requires a storage space of order 0(N) and an execution time of order 0(N2). Fields generated by a TEz line source are represented in an integral form in terms of the field over a fiat, constant impedance plane, and the field scattered by the terrain irregularities and inhomogeneities. Accurate expressions are provided for the incident field and the Green's function, whose evaluation is otherwise accomplished by the rather time-consuming Sommerfeld's integrals. Measured equation of invariance is used to terminate the mesh. The sparse matrix generated by the method is inverted using Ricatti transform. Numerical results are presented for the ground wave as well as the sky wave. Comparison is made for known geometries to establish the validity and limitations of the method.
