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• DEVELOPMENT AND RESEARCH OF THE EQUALIZER CONFIGURATION TO INCREASE NOISE IMMUNITY IN DECAMETER RADIO LINES

  А. I. Rybakov

  212-227

  2025-10-01

  Abstract ▼

  The problem of increasing the noise immunity of decameter radio lines (DRL) in modern domestic radio communication systems, including short-wave (SW) communication, remains significant and in demand, despite the existence of numerous classical studies. The decameter radio communication systems have been chosen as the object of our analysis. Specifically, the R-016 system, which is used as a prototype, faces limitations such as its frequency range, which affects its effectiveness in conditions of variable ionospheric characteristics that negatively impact the signal level. Signal processing issues in prototypes can lead to bit errors reaching a bit error rate (BER) of 10^-3, even in the absence of significant interference. The main objective of the study is to evaluate the impact of various factors, such as changing the length of the preamble and implementing adaptive filters, on the noise immunity of systems. The analysis of the results indicates that increasing the length of the preamble improves the noise immunity of decameter radio lines. The practical significance of the results is that they can be used to improve the noise immunity of existing DFM radio communication systems that operate in variable ionospheric conditions. This paper also discusses the scientific basis for selecting an equalizer configuration for decameter radio lines to increase communication range and improve noise immunity. The developed methods provide a scientific basis for selecting effective equalizer settings, which can lead to improved communication range. To test different equalizer configurations in a Rayleigh channel, Simulink simulation is used, which confirms the correctness of the selected parameters. Experimental validation of the decameter radio line model includes the study of various preamble lengths, and the analysis of signal-to-noise ratios (SNR) at the receiver input allows for the adaptation of these parameters. Thus, the research results show that increasing the preamble length has a positive impact on the system's noise immunity. The work focuses on the modeling and operation of DFM radio lines, and the obtained results have practical significance for the active adaptation of existing radio systems in a changing ionosphere

• METHOD FOR INFORMATION INTERACTION BETWEEN AN OPERATOR AND AN AUV EQUIPPED WITH A HYDROACOUSTIC COMMUNICATION CHANNEL FOR TARGET OBJECT IDENTIFICATION

  А.Y. Konoplin , А.P. Yurmanov , А. Y. Rodionov , R.P. Vasilenko , М.О. Panchuk

  2026-04-29

  Abstract ▼

  The execution of inspection and manipulation operations by autonomous unmanned underwater vehicles (AUVs) under operator supervision is limited by the low bandwidth of the hydroacoustic communication channel, which does not allow the transmission of video streams and high-quality photographic images in real time. At the same time, existing methods for automatic recognition of target objects by onboard machine vision systems of AUVs do not guarantee accurate determination of the object’s position and shape when defects are present on its surface (siltation, biofouling, mechanical damage). To address this problem, the paper formulates the task of developing a method that enables information interaction between the operator and the AUV via a low-bandwidth hydroacoustic communication channel. This interaction allows the operator to evaluate the quality of target object recognition and subsequently generate target designations for the vehicle and its onboard manipulator. The proposed method is based on an algorithm for identifying objects with defects, which employs a modified ICP point cloud registration approach with the exclusion of defective regions and characteristic features (CFs). The detected CFs and defect regions are transformed into a compact set of geometric primitives transmitted to the operator through the hydroacoustic communication channel with the AUV. Based on the received information, incoming telemetry from the AUV, and a reference three-dimensional model of the object, the graphical interface visualizes the scanned scene, allowing the operator to assess the recognition accuracy. Full-scale experimental tests of the method were conducted using a hydroacoustic modem manufactured by the Institute of Marine Technology Problems, Far Eastern Branch of the Russian Academy of Sciences (IMTP FEB RAS) and an onboard computer NVIDIA Jetson TX2. The information packet transmitted within
  1 minute contained the object type, its position, a defect map, and the coordinates of the characteristic features, with a data volume three orders of magnitude smaller than that required for transmitting the full point cloud of the scanned object. Based on the received information, the operator confirmed successful object identification even when up to 30% of the surface area was covered by defects. The practical significance of the proposed method lies in enabling the execution of critical missions under operator supervision in conditions of environmental uncertainty

• DEVELOPMENT OF A RELIABLE RTC COMMUNICATION METHOD BASED ON A GROUP DATA SEPARATION METHOD BASED ON A RESIDUAL CLASS SYSTEM

  Y.N. Kocherov, D.V. Samoilenko

  2021-04-04

  Abstract ▼

  The paper considers a reliable method of data transmission in commu-nication systems and
  control of robotic complexes. Due to the fact that a change in part of the encoded information
  transmitted through com-munication channels can lead to partial or complete loss of data and, as
  a consequence, lead to loss of control over the robotic complex. There-fore, it is necessary to apply methods of protecting data transmitted over radio channels. The proposed method is intended
  to ensure the protection of information in the communication channels of robotic complexes from
  the access of unauthorized users and to confirm the reliability of the information received.
  The article examines data protection methods designed to protect in-formation circulating in systems
  formed by several interacting agents. The approach under consideration is based on the
  methods of infor-mation protection and error-correcting coding based on the system of residual
  classes. The applied methods of error-correcting coding, based on the system of residual classes,
  are based on the idea of threshold data separation, in which the original information can be restored
  from parts of the original information. This is due to the fact that redundant modular
  arithmetic, or redundant system of residual classes, has unique properties with re-spect to error
  detection and correction. In addition, the system of resid-ual classes has such an advantage as low
  computational complexity of data separation algorithms. To increase the reliability of communication
  between robotic complex-es in multichannel communication systems, the paper proposes a
  meth-od for information protection and noise-resistant coding, based on a multistage threshold
  data separation. As a result of the work, a system of noise-resistant information trans-mission was
  obtained, which provides comprehensive protection for robotic systems.