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• THE ANALYSIS OF REQUIREMENTS FOR RADIATION PARAMETERS OF RADIO EQUIPMENT IN UNMANNED AERIAL SYSTEMS

  B.М. Antipin, Е.М. Vinogradov, О.А. Simonina, S.L. Fedorov

  2023-12-11

  Abstract ▼

  Based on the analysis of domestic and foreign regulatory documents, the features of the use
  of the radio frequency spectrum in the Russian Federation for unmanned aircraft systems (UAS)
  are considered. The types of radio channels for communication between the UAS and the ground
  control station are considered and the frequency ranges allowed for use for communication with
  the UAS according to the regulatory framework of the Russian Federation are determined. Licensed
  ranges include 117.975–137 MHz; 5030–5091 MHz; 5850–6425 MHz, but it is possible to
  use unlicensed bands 137–174 MHz; 395–400 MHz; 430–460 MHz: 433.05–434.79 MHz;
  860–880 MHz; 902–928 MHz; 1100–1400 MHz; 2400–2483.5 MHz. It is shown that there is a
  problem of using unlicensed frequency ranges due to restrictions on the parameters of radio emission
  and ranges of mobile communication systems due to the lack of a regulatory framework.
  The regulatory framework defines the requirements for the radiation levels of radio-electronic
  means (RES) BASS in licensed ranges that should not exceed 100 MW. Currently, in the Russian
  Federation there are no regulatory requirements for the technical parameters of RES BAS for
  their radio channels in unlicensed ranges, but there are restrictions on short-range devices using
  these ranges. At the same time, there are a number of regulatory documents of other countries that
  determine the signal levels in flight control channels. The possibilities of using UAS for radio
  monitoring purposes are considered using the example of the trial operation of the Orlan-10 unmanned
  aerial vehicle (UAV), taking into account existing restrictions in the field of the regulatory
  framework. It is shown that there are a number of restrictions for their effective use for radio monitoring
  purposes: in the field of the regulatory framework, technical characteristics of antennas
  and the dependence of the results on the flight altitude. Limitations due to climatic factors are also
  an important factor. Moreover, it is precisely for hard-to-reach areas with difficult climatic conditions
  that this monitoring method is the most promising.

• ADVANCED HIGH-PERFORMANCE RECONFIGURABLE COMPUTERS WITH IMMERSION COOLING

  I.I. Levin, А. М. Fedorov, Y.I. Doronchenko, М. К. Raskladkin

  2021-02-25

  Abstract ▼

  The paper deals with prospects for the design of high-performance reconfigurable computing devices
  based on modern Xilinx UltraScale+ FPGAs. The aim of the research is the computational density
  up to 128 LSI FPGAs in one 3U 19’ product. Besides, it is necessary to provide the required powersupply and cooling of the system’s computing elements during execution of computationally expensive
  tasks. To provide the product’s required parameters in the given design package, we made the topology
  of our printed circuit boards and the design technology of their parts more complex. To cool the components
  of our computer system, we use the immersion technology. The distinction of the designed computer
  systems is wide capabilities of data exchange inside the block and among the blocks. It is crucial for
  tightly-coupled tasks, where the number of data transfers among functional devices is much higher than
  the number of such devices. As the main links between FPGAs, we use differential lines with multigigabit
  transceivers (MGT). The optical channels based system of data exchange among the blocks is
  provides the throughput over 2 Tbit/sec. We designed and produced a prototype of a computational
  module based on UltraScale+ FPGAs, and a prototype of a reconfigurable computational block. The
  computational block contains a general-purpose processor and all needed input-output interfaces. It is a
  stand-alone device. We used the new-generation computational module for implementation of several
  algorithms of various scientific and technical problems, and proved its wide applicability. We designed
  a modified immersion cooling subsystem, which dissipates total heat up to 20 kW. To achieve such level
  of heat dissipation, we implemented technical solutions concerning all components of the cooling system:
  the cooling agent, heat sinks, the pump, the heat-exchange unit. It is possible to unite several blocks
  into computer complexes with the performance up to tens of petaflops. Such complexes require a suitable
  engineering infrastructure.