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November 2, 2016
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December 31, 1967
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24936 S/188/61/000/004/002/003 Some peculiarities of USW-signal B111/B209 geneous, the fluctuations at the output of the receiver will differ from those in free space. This difference is determined by the conditions in the troposphere and by the reflection coefficient. Next, some results of experimental studies during 1959 - 60 (Ref. 8: Semenov, A. A., Karpeyev, G. A. , Radlotekhnika i elektronika, A, vyp. 2, 1959) are given provinK the fluctuational characteristics of the wave field to be patel-Ohaped when the structure of the mean field level is also patel-shaped. The studies lead to the conclusion that in certain cases, when refraction is enhanced, the amplitude fluctuations in the course of one meaguring process cannot be regarded as steady. The authors point out that the fluctuations with nonsteady characteristics reveal a definite seasonal course. A comparison of the temporal self-correlations of the fluctuations with the spatial correlations showed that an analysis of the temporal self-correlations only agrees satisfactorily with the theory of local isotropic turbulence when during the reception time T of two consecutive signals the inhomogeneities do not vary but.are transmitted with drift velocity only. Measurements of the coefficient of the spatial transverse correlations of the amplitude fluctuations of the received signal resulted in values that are ir agree- ment with those ascertained by time analysis. There are 4 figures and Card 3/4 24936 S/188/61/000/004/002/003 Some peculiarities of TJSW-signal ... B111/B209 14 Soviet-bloc references. ASSOCIATION: Kafedra rasVostraneniya radiovoln (Department of Radiowave Propagati( SUBMITTED: May 26, 1960 (initially) May 25, 1961 (after revision) Card 4/4 31984 s/142/61/oWoo4/005/018 E192/E382 AUTHORS: Karpeyev, G.A., Kubasov, P.Ye., Semenov, A.A. and TITLE: Possibility of employing the phase-meter method in the investigation of field fluctuations of radio waves propagating in a turbulent medium PERIODICAL: Izvestiya vysshikh uchebnykh zavedeniy, Radiotekhnika, v. 4, no. 4, ig6i, 425 - 431 TEXT: It is known that during propagation over routes near the ground the field at the receiver is determined by the average characteristics of the medium and the earth surface as well as their statistical characteristics (Ref. 2 - A.G. Arenberg - Propagation of decimetre and centimetre waves - izd-vo Sovetskoye radio, 1957). The presence of statistical processes leads to the amplitude- and phase-fluctuations of the waves and these fluctuations are random functions of time and space coordinates. It can be assumed for the purpose of analysis that at a point P of the space v the field (vector or scalar) can be expressed by: Card 1/6 S/1 4~2.1/96,%j/o o4 /oo4/005/01 8 Possibility of employing .... C-192/E382 -1 1 iY1 (P, t) _ > (P, t) E (p, t)e m E (p, t) :Lk m m where the sum extends over all the partial fields ~ m(P, t) which can be regarded as having arrived at the receiver along various trajectories; the field E(P, t) Is therefore a result of multi-ray propagation. A two-antenna interferometer, shown in Fig. 1, Is used as the receiver; it consists of: 1 - two antennae; 2 - feeder system and 3 - a squaro-detector. The voltage at the point C of the receiving system can be expressed by- 3"PM(Pl 1 t) E (r , t) G (t)E'(P,,t)e + c ,y_ I m m M i(PM(P29 t) Card 2/6 M 1-T9~-h 3/142/61/604/004/005/018 Possibility of employing E 19,-, / r,3 8 2 where G1M and G2m,.. are the gain coefficients of the two -antennae, Y (P, t) = Y'(P, t) + Y where 9 represents the inean M M Mp m value of the phase in the antenna aperture, YMP is the fixed phase-shift during transmission of the signal from point P to point C of the feeder system. The mathematical expectation U0(~) of the amplitude U(r, t) of the output signal of the square-detector (see Fig. 1) is found analytically and this expression is employed to determine the conditions during propagation of ultrashort waves over near- ground routes extending over tens of kilometres, Under the assumption that the fluctuations are small two cases(important in practicd are investigated: 1) the field at the receiver has only one component (m, n = 1) and 2) the field consists of two componentsE 0+ Es, such thatE0 has a constant phase and amplitude, while Es is a random components It is found that for Card 3/5 319~lt S/142/61/004/004/005/018 Possibility of employing E192/E382 the first case the expectation U 0(i) depends on the invariable field characteristics as well as the statistical characteristics of the medium. It is further shown that use of the phase-meter svstem accentuates the relative fluctuations of the output signal so that these can be measured and investigated comparatively easily. Secondly, the method makes possible measuring the space correlation characteristics of the field fluctuations. In the case of the field consisting of the two components E 0 and E. use of the method permits elimination of the constant field component, which facilitates measurement of the field fluctuations. The problem was investigated experimentally and it was found that in the direct-visibility zone the amplitude-phase fluctuations of the ultrashort waves were so small that there existed practical difficulties in effecting the measurements. Thus, for example, during 65 measurement periods conducted between Janun and March, 1957, in 33 cases the relative fluctuation a,-