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 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.

Deviations of Short Radio-Waves from the London-New York Great Circle Path

Nature ◽  
1938 ◽  
Vol 141 (3568) ◽  
pp. 510-511 ◽  
Author(s):  
C. B. FELDMAN
Keyword(s):  
New York ◽  
Great Circle ◽  
Radio Waves ◽  
Great Circle Path

The Vector Function for Distance Travelled in Great Circle Navigation

2006 ◽  
Vol 60 (1) ◽  
pp. 158-164 ◽  
Author(s):  
Wei-Kuo Tseng ◽  
Hsuan-Shih Lee
Keyword(s):  
Linear Combination ◽  
Vector Function ◽  
Personal Computer ◽  
Great Circle ◽  
Departure Point ◽  
Easy Method ◽  
Vector Algebra ◽  
Elementary Knowledge ◽  
Vector Basis ◽  
Great Circle Path

Traditionally, on a great circle, the latitude or longitude of a waypoint is found by inspection. In this paper, using an elementary knowledge of vector algebra including linear combination of vectors and vector basis, we provide an easy method for finding the equation of a great circle path as a parameterized curve. By use of this vector function of distance travelled, the latitude and longitude of waypoints can be found based on the distance from departure point along a great circle. The approach is intended to appeal to the navigator who is interested in the mathematics of navigation and who, nowadays, solves his navigation problems with a personal computer.

The Coriolis Effect

1953 ◽  
Vol 57 (514) ◽  
pp. 655-658
Author(s):  
Paul E. Wylie
Keyword(s):  
Great Circle ◽  
The Body ◽  
Coriolis Effect ◽  
Deflection Of The Vertical ◽  
Horizontal Acceleration ◽  
The Earth ◽  
Moving Body ◽  
Great Circle Path

The coriolis effect is a change in the motion of a body passing over the surface of the Earth due to the motion of the Earth itself. The effect may be manifested either as a horizontal acceleration, or, in the absence of the acceleration, as a deflection of the course. The acceleration, which appears in controlled courses such as those of aircraft, usually appears and is significant as a deflection of the vertical. This acceleration appears whenever a body, such as an aircraft, is forced to follow a great circle path over the Earth. The deflection of the course of a moving body appears alternatively whenever the body moves freely in its inertial path above the surface of the moving Earth.

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.

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