Radio communication channel characteristics estimation in the marine environment

Abstract

The results of data processing obtained in the course of full-scale experiments on the transmission of a short-wave radio signal in the marine environment using special ball antennas are presented. The capacity of the radio communication channel in the modulation frequency band is estimated. Statistical estimates of signals and noises are obtained, which make it possible to calculate decision-making thresholds based on the theory of statistical radio engineering. It is concluded that it is possible to create a two-way voice radio communication channel between mobile underwater objects. Keywords: underwater radio communication, radio communication channel capacity, ball antennas, generalized electrodynamics.

The principle of organizing an underwater radio communication channel using spherical antennas

“…The boundary condition (22) indicates the fundamental possibility of organizing a communication channel for a ground radio station operating on conventional transverse waves with the mobile underwater object whose antenna is capable of receiving longitudinal waves. This conclusion was indirectly confirmed by analyzing the signals recorded with the help of the underwater spherical antenna in the course of the experiments described in the articles [1,2]. In the power density spectrum of the received signal the narrow-band harmonics were found, the presence of which cannot be explained, for example, by multiple frequencies " of the tone call".…”

“…In the experiments described in the articles [1,2] the spherical antennas with a diameter of 60 mm made of copper were used. They were loaded on kapron halyards into the sea to a depth of 6 to 10 m. An amplitudemodulated or frequency-modulated non-stationary electric potential φ(t) with a carrier frequency of 27 MHz was created on the transmitting antenna, and the receiving spher-ical antenna recorded this signal.…”

“…However, in the atmosphere and in outer space radio communication using transverse waves works much more efficiently. Using longitudinal waves you can solve the problem of radio communication with mobile underwater objects [1,2], and also it can be used to transmit radio signal in mine workings [22].…”

“…In [3] a method for calculating the inductance of the spiral coil and resonant frequencies of the spherical antenna is given, taking into account its electric capacitance. It was used in the design, manufacture and setting of antennas, which were used in the experiments described in the articles [1,2]. Note that the resonant setting of the spherical antenna with spiral coil is complex process.…”

“…The papers [1,2 ]present the results of full-scale experiments on the transmission of short-wave (HF) radio signal in the marine environment within half a kilometer using special spherical antennas. The carrying capacity of the radio communication channel is estimated, its spectral and energy characteristics are obtained.…”