P.L. Batov - Head of the Special Design Office, JSC «Almaz-Antey». E-mail: drozhzhina@mail.ru N.V. Drozhzhina - Head of Sector, JSC «Almaz-Antey». E-mail: drozhzhina@mail.ru

Computational algorithm for control codes in active phased antenna array (APAA) was designed. APAA is structurally divided to 128 subarray blocks (SB). Every SB consists of 8 transmit-receive modules (TRM). There are processing unit and long term storage (LTS) in every TRM. TRM make all work calculations. There are active elements in APAA microwave channels in SB and TRM. Beam synthesizer is cascade waveguide power divider. Thereby every microwave channel consists of parts with active elements or without them. Electrical lengths and corresponding amplitude and phase corrections of microwave channel parts with active elements depend on frequency and current channel temperature. In case of controlled attenuator and phase changer amplitude and phase corrections also depend on their setup tolerances. Thereby in computing of amplitude and phase distribution for required beam forming and electronic scanning it is necessary to use previously measured amplitude and phase corrections for parts of microwave channels with active elements and without them. It is also necessary to use ready-made amplitude and phase corrections providing required beam shape. Amplitude and phase corrections for parts of microwave channels with active elements are measured during fabrication stage. There is no necessity to rewrite them during APAA life cycle. Another corrections require periodically measures and can change. All amplitude and phase corrections are stored in TRM LTS. Input information for amplitude and phase distribution calculating is current frequency data, SB channels temperature data and beam direction. APAA TRM processing units make calculations synchronously and simultaneously. Distributed in APAA computing system allows to raise control reliability, because even in case of many TRM failures APAA control and beam forming are not interrupting. Control system also has on-stream check and can deactivate of defective channels if it is necessary.

 

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