An Equivalent Transmit ADBF Technique for Phased-MIMO Radar

Abstract

The purpose of adaptive digital beam-forming (ADBF), is to obtain the biggest gain in the expected direction, at the same time suppress interfering signals automatically. For phased-multiple-input multiple-output (MIMO) radar applied to large array, the overall ADBF process suffers from heavy computing burden. This is because the signal processing is conducted on the virtual array. Therefore, an ADBF algorithm should consider not only high output signal-to-noise-plus-interference ratio (SINR), but how to reduce computational complexity. This paper presents an equivalent transmit ADBF process technique whose essence is to separate the overall ADBF into a digital beam-forming in receiver and a ADBF in equivalent transmitter. Theoretical analysis and simulations show that this method guarantees the high output SINR and greatly reduces the computational complexity.