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Technology for power output control of APAR RTM

Keywords:

P.A. Tushnov – Head of Department, Main Technologist, PJSC «Radiofizika». E-mail: tushnovp@mail.ru V.S. Berdyev – Ph. D. (Eng.), Head of Department, PJSC «Radiofizika». E-mail: v_ber@mail.ru


Problems of design and production of modern active phased array radar (APAR) are associated with the creation of high-performance receive-transmit modules (RTM), whose parameters are largely determined by the characteristics of APAR as a whole. In case of several thousands to tens of thousands microwave channels energetic characteristics of APAR are almost entirely determined by those of RTM. The process of RTM creation involves achieving of high performance characteristics while taking into account limits in cost forming, selecting of electronic components and applied technology level. Therefore, it is crucial to use advance approaches and technological solutions to ensure high efficiency both in the production and operation of RTM. A method to achieve required potential capacity of active phased array radar (APAR) was proposed while minimizing costs for energy consumption, costs of providing thermal stabilization for heat-producing elements of receive-transmit modules (RTM) and simultaneously reducing weight and size and cost characteristics of APAR. We considered aspects influencing the APAR power output and destabilizing factors such as variation of electronic component parameters, change in frequency of a given band, technological errors, temperature variation, etc. Possible applications of technology for power output control (TPOC) of RTM was considered to facilitate control over APAR directional pattern and beamwidth as well as to create contoured beam patterns and to calibrate APAR by use of the controlled formation of the amplitude distribution over the aperture in accordance with the desired law. We highlighted ways to compensate impacts of destabilizing factors by using a method for stabilization of the power output of RTM as a special case of TPOC. The assessment of APAR energy efficiency improvement when using a method of stabilization of the power output of RTM is given. Application of TPOC of RTM channels has a number of advantages. In the process of APAR production and setting TPOC leads to higher technological effectiveness and possibility of series production of RTM as it is technologically easier to start mass production and ensure repeatability while eliminating power limitation setting and ad-justment of each particular module and channel. TPOC can also improve the accuracy of measurements performed during APAR cali-bration; it facilitates the calibration process, leads to a decrease in time of the calibration process that is important for maintenance-free products for which calibration is provided as a standard procedure during the operation of the product. It allows to perform APAR calibration in special screened rooms at low power levels, which contributes to a significant reduction in personnel exposure to microwave radiation. In order to achieve high performance characteristics of APAR the use of TPOC can facilitate the directional pattern control, increase efficiency ratio of the coverage while creating antennas with contoured beam patterns, improve electromagnetic compatibility of the radar and the neighboring in-line radioelectronic facilities by reducing the average radiated power. TPOC provides stable output power at temperature drops, improves weight and size and cost characteristics of APAR, contributes to the survivability of the radar in case of failure of some RTM by facilitating the process of amplitude distribution reconfiguration, provides stable output power throughout the entire life cycle of the product in case of deterioration of individual RTM over time.
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