Hardware Implementation of MUSIC Algorithm for Airborne Digital Direction Finding System

To solve the issue of high complexity and poor real time in conventional array direction finding system of multiple signal classification algorithms, a digital solution based on field programmable gate array (FPGA) is presented. The solution includes real time quadrate demodulation and pretreatment, coordinate rotation digital computing (CORDIC) algorithm in rotation mode to realize singular value decomposition in order to reduce computation, and finally achieves the real time array direction finding. Hardware simulation and tests show that the system works stably and can ensure the deviation is less than 0.5 degree with over 64 snapshots, which can be used in precise positioning and measurement.