I.V. Golikov - Head of Sector, JSK NIIP. E-mail: igorniip@gmail.com К.N. Senkov - Engineer, JSK NIIP. E-mail: senkovkn@gmail.com

X-band active phased array radar circular scan (AESA-CS) has an 88 transceiver-transmitting channels and look like cylinder formed Linear Single Slot Emitters (LSSE) in the amount of 88 units. Inside the cylinder from LSSE located 11 transceiver-transmitting modules (TTM) where each TTM has 8 channels. Cylindrical AESA allows circular scan and has the advantage that form of directivity pattern (DP) and gain rate practically unchanged at any position of the beam as the movement of the beam at azimuth plane is carried out by switching movement of the active zone, in contrast of flat phased array radar, where movement of beam is carried phase method and has negative feature of widening of the beam and the fall of the gain rate while scanning. Radiant Systems designed in the form of slot lines on a standing wave with waveguide powering. Radiant line is a rectangular waveguide filled with dielectric with longitudinal resonance slots. A multichannel transceiver-transmitting module provides amplification of the emitted and received pulses and control of the phase distribution during transmission and also provides control of the amplitude-phase distribution at the receiving of two beams. TTM module consists of two quad-channeled lines. Channel line includes microstrip valve, control device, microwave submodule, installed in each channel and submodule output power amplifier. APAR-CS has two beams, the first beam is realized by the combined directional pattern for transmission and receive. The second beam exists only at the reception, and implements a difference directivity pattern, however, at this APAR output can be generated other directivity patterns (compensation, with total different from the first beam amplitude distribution, the total in the deflected beam from the first direction). For this antenna system are calculated some characteristics: energy potential of the transfer rate 41000 watts; the active gain an ap-pointment is not less than 40 dBi; power consumption of the antenna system does not exceed 150 watts; weight and size characteristics: diameter 480 mm, height 350 mm, weight 27 kg. The antenna works with the time division mode of reception-transfer in accordance with the diagram. Start pulse transmitter (SPT) and impulse blocking receiver (IBR) are critical and define the mode of operation of the transmitting and receiving channel respectively. Controlling the work realized by modulating the power output of the power amplifier for transmission and low-noise amplifier (LNA) at the reception according to the set parameters, data strobe and beam control module (BCM) data on the active channels. Based on the feature of the method used scanning - by moving the switching active zone channels involved in forming the directivity pattern for circular aperture of the antenna system was developed and implemented the following algorithm for the channels. All channels are divided into three zones: «hot» zone - channels involved in the current work cycle of the antenna; «warm» zone - channels that will be involved at the next work cycle of the antenna; «cold» zone - channels that wouldn-t be involved at the current and next work cycle of the antenna. At the «cold» zone all power supply are turned off, at the «warm» zone power supply applies to the board of modulators, located in each channel, which is responsible for power management of microwave devices, in the «hot» zone is served all necessary power supply for microwave devices and performed modulation of supply voltages of the output of the power amplifier and low noise amplifier. This algorithm of power management and channel work allows to save more than 30% of power consumption and heat dissipation, and also increase the average efficiency of the channels. Presented APAR has a wide range of applications and opportunities, thanks to low weight and size parameters can be based on various objects and solve a number of tasks, such as: traffic control; obstacle detection and collision avoidance; detection and tracking targets.

 

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