Kostanovskyi V. Methodology for improving the efficiency of maintenance of active phased antenna arrays of multifunctional radar stations

The work is devoted to the development of the methodology for improving the efficiency of maintenance of active phased array antennas (APAA) of radar stations. In this paper, mathematical models of reliability and efficiency of operation of active phased array antennas according to the criteria of technical use and economic efficiency are developed and improved. Mathematical models of reliability of electrical products describing sudden and gradual failures are improved in the work. Reliability models of maintenance – free APAA with k – level structural scheme of reliability at sudden and gradual failures of antenna array modules are developed and investigated. Accounting for gradual failures of antenna array modules can increase the reliability of APAA from 30 % to 80 %. Mathematical models of reliability of serviced APAA are developed. Improved methods for determining the required number of spare antenna array modules to provide APAA maintenance. Developed and researched models of optimal maintenance of radars with APAA, the use of which allows to reduce from 15 % to 35 % of the operating costs at the stage of warranty service. Strategies for maintenance and operation of APAA radar based on operating time and actual condition are determined, models and methods for implementation of these strategies at the stage of post-warranty service are developed.