Morphological analysis of non-great-circle propagation of decameter radio waves over northern paths

2019 ◽  
Author(s):  
Vera A. Ivanova ◽  
Alexey Podlesnyi ◽  
Andrey A. Naumenko ◽  
Ivan D. Tkachev
Keyword(s):  
Morphological Analysis ◽  
Great Circle ◽  
Radio Waves ◽  
Decameter Radio

Deviation of decameter radio waves from the great circle path at high latitudes

1991 ◽  
Vol 34 (2) ◽  
pp. 102-105
Author(s):  
N. F. Blagoveshchenskaya ◽  
A. N. Baranets ◽  
T. D. Borisova ◽  
V. A. Bubnov
Keyword(s):  
Great Circle ◽  
High Latitudes ◽  
Radio Waves ◽  
Decameter Radio ◽  
Great Circle Path

scholarly journals NCREASING IMMUNITY OF DECAMETER RADIO CHANNEL TRANSMISSIONS UNDER UNINTENDED INTERFERENCE

T-Comm ◽  
2021 ◽  
Vol 15 (6) ◽  
pp. 4-9
Author(s):  
Sergey V. Dvornikov ◽  
◽  
Evgeniy V. Markov ◽  
Adjan A. Manoshi ◽  
◽  
...  
Keyword(s):  
Fading Channels ◽  
Rayleigh Fading ◽  
Noise Immunity ◽  
Radio Channel ◽  
Radio Waves ◽  
Radio Communication ◽  
Radio Channels ◽  
Shift Keying ◽  
Decameter Radio ◽  
Significant Length

The transmission of messages is a complex process, which is largely determined by the properties of the radio channel used. Decameter radio channels are the most difficult for organizing communication, since the ionospheric propagation of radio waves is associated with their significant attenuation, due to the significant length of the paths, as well as the presence of Rayleigh fading in the channel. However, the possibility of transmitting information over long distances without serious resource costs stimulates further research to improve the reliability of decameter radio communication. In this paper, we investigate the possibility of increasing the noise immunity of frequency-shift keying transmissions of decameter radio channels in conditions of unintentional interference due to the use of broadband signals. An analytical expression of the dependence of the probability of a bit error on the level of the ratio of the peak signal power to the peak interference power is considered; a graph of this dependence is presented. It is shown that the plot is consistent with the overall noise immunity estimate for Rayleigh fading channels using double FSK signals. The rationality of methods for obtaining the required reception quality in decameter radio channels is analyzed. It is shown that the most rational direction for increasing the noise immunity of FM-2 transmissions in decameter radio channels with Rayleigh fading in conditions of unintended interference is the use of broadband signals. In this case, for expansion, it is advisable to choose a value kf = 7, which makes it possible to increase the noise immunity by 9 dB. The conclusions are illustrated by graphs.

scholarly journals Forecasting characteristics of propagation of decameter radio waves using the global ionosphere and plasmasphere model

2015 ◽  
Vol 1 (3) ◽  
pp. 49-54 ◽  
Author(s):  
Сергей Пономарчук ◽  
Sergey Ponomarchuk ◽  
Галина Котович ◽  
Galina Kotovich ◽  
Елена Романова ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Radio Wave ◽  
Normal Wave ◽  
Middle Latitude ◽  
Radio Wave Propagation ◽  
Radio Waves ◽  
Radio Communication ◽  
Iri Model ◽  
Decameter Radio ◽  
Minimum Number

We present the forecast results of maximal usable frequencies for mid-latitude paths on the base of complex We present the results of forecasting maximum usable frequencies (MUF) on middle-latitude paths on the basis of complex algorithm including modules of the ionosphere and plasmasphere global model (IPGM) and the model of radio wave propagation. The computation of propagation characteristics for decameter radio waves is carried out within the framework of normal wave technique. IPGM developed in ISTP SB RAS enables to compute electron concentration profiles and effective frequency of collisions using minimum number of input data and taking into account physical processes in the Earth’s upper atmosphere. To estimate the efficiency of using IPGM in long-term forecast of radio wave propagation we computed MUF for radio communication in various heliogeophysical conditions. To obtain precision characteristics of MUF forecast we used experimental data of oblique sounding on Magadan–Irkutsk, Khabarovsk–Irkutsk, Norilsk–Irkutsk paths. The paths are equipped with modern ionosphere diagnostic hardware for oblique sounding by continuous chirp signal. We also compared results of MUF forecast using IPGM with computations carried out according IRI model.

scholarly journals On the rotation of the plane of polarization of long radio waves

1934 ◽  
Vol 145 (854) ◽  
pp. 145-158 ◽  
Keyword(s):  
Great Circle ◽  
Long Waves ◽  
Radio Waves ◽  
Magnetic Poles ◽  
Great Circle Path ◽  
Space Wave

The propagation of long waves at great distances has been studied in great detail by Austin, by Round, Eckersley, Tremellen, and Lunnon, by Espenschied, Anderson, and Bailey, and by Yokoyama and Nakai. Thus the propagational characteristics of long waves, considered merely as channels of communication, are well known. There have remained, however, a number of unexplained directional effects of which one might quote as an example the difficulty, noticed by Round, Eckersley, Tremellen, and Lunnon, of receiving signals whose great circle path traversed the earth’s magnetic poles. Pronounced directional effects at short distances have been reported by Naismith. He found that the intensity of the space wave from GKB, Northolt, was approximately twice as great at Manchester as at Exeter although both receiving points are at the same distance from the transmitter. At Manchester the receiver was north of the sender, while at Exeter the direction was west.

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