Transmit/received beamforming for MIMO log-frequency diverse array radar

Frequency diverse array (FDA) radar with logarithmic offset has been proposed recently to avoid the periodicity of FDA radar beam pattern by applying a non-uniform frequency offset. The resultant system called Log-FDA produces exactly one maxima at the location of desired target. In this paper, we have proposed the multiple input multiple output frequency diverse array radar with logarithmic offset (MIMO-log-FDA). FDA transmit array is divided into multiple subarrays, each using a logarithmic offset and unique waveform across its antenna elements. The beams produced by multiple subarray are focused on the target of interest to get a better information about the target. Non-uniform offset allows a single maxima for each beam, resulting in improved signal information at the receiver. Transmit/received beampatterns, signal to interference plus noise ratio (SINR) and detection probability of proposed radar are compared with FDA and log-FDA radar. Simulation and results verify the effectiveness of proposed scheme.