SOME METHODS FOR DATA FLOW SYNCHRONIZATION IN DIGITAL SIGNAL PROCESSING SYSTEMS

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