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• REALIZATION OF METHODS FOR SYNCHRONIZATION OF DATA FLOWS IN DIGITAL SIGNAL PROCESSING SYSTEMS

  I.I. Levin , D.S. Buryakov

  119-134

  2025-07-24

  Abstract ▼

  In digital signal processing applications involving coherent processing of data from a phased antenna array, it is important to ensure the coordinated arrival of digitized data from antenna elements to processing units. As the number of data transmission channels in DSP complexes grows, the probability of errors in the data transmission channels increases significantly, which puts forward increased requirements to the assurance of the program complex of isochronous data transmission. The paper presents the results of the development and realization of methods that increase the assurance of isochronous data transmission. A combined method of isochronous data transmission is proposed, characterized by the use of service gaps in the transmission of operand arrays and dynamic compensation of delays in data channels. The most probable errors occurring during data transmission are singled out and methods of their parrying are proposed. A program complex realizing the combined method is described. Using the attributive model of dependability, the dependability of the program complex is analyzed. The analysis has shown that the use of the combined method will quadruple the number of data transmission channels in the DSP complex at a given level of dependability and fixed time of reliable operation in comparison with the basic method. With a significant increase in the number of data channels, there is a need to maintain a given level of dependability. In this regard, a modernized method of isochronous data transmission is proposed, in which the algorithms for checking data integrity, checking the acceptable range of delay mismatch in the data channels and the algorithm for switching the reference channels were improved. An evaluation of the implementation dependability of the modernized method showed its ability to provide twice the number of data channels compared to the combined method.

• SOME METHODS FOR DATA FLOW SYNCHRONIZATION IN DIGITAL SIGNAL PROCESSING SYSTEMS

  I.I. Levin, I.I. Levin, D. S. Buryakov

  2024-11-10

  Abstract ▼

  The paper proposes some methods of providing coherent data processing in radar and communication
  systems that include phased arrays. An approach is developed to collect digitized data from the antenna
  elements of phased array and transfer information between distributed nodes that perform digital
  signal processing. To ensure coherent data processing and transmission, it is proposed to use a reference
  clock frequency signal and a common machine time, which are generated in the central node and distributed
  through the channels with the same delay. All control actions in the processing nodes are based on
  these signals. For the transmission of digitized data from the antenna elements of the phased array in the
  work it is proposed to use the transmission by fragments of operands with information integrity control
  and time reference of the digitized data. The experiments conducted on a real directional pattern formation
  device confirmed the effectiveness of this method and its suitability for practical use. The development
  of digital signal processing systems with phased array is constantly moving forward, and new radar
  systems with high resolution and sufficient sensitivity are required. Usually, to increase the resolution, the
  number of antenna elements is increased. However, this leads to an increase in the size of the antenna and
  hence the length of the links. As the length of the link increases, differences in signal propagation paths
  may occur due to the variation in the characteristics of optical links and the influence of external factors
  on the signal as it is transmitted through longer links. This can lead to inhomogeneity in delays between
  synchronization channels and disruption of the coherent processing system. In this regard, a new method
  of dynamic compensation of delays in the channels of the common machine time system for correct operation
  with long communication lines is proposed in this paper