Subarrays of Phased-Array Antennas for MIMO Radar Applications

Syahfrizal Tahcfulloh


Subarray-MIMO (SMIMO) radar is MIMO radar with elements in the form of subarrays that act as phased-arrays (PA) so that it simultaneously combines the main advantage of the PA radar, i.e. high directional gain to increase target range and the main advantage of the MIMO radar, i.e. high diversity gain to increase the maximum number of detectable targets. Various configurations for the number of antenna elements in the transmit-receive subarrays such as the number of elements being uniform and/or variable, and overlapping and non-overlapping determine significantly the performance of the radar such as virtual arrays, maximum number of target detections, accuracy and resolution of the target angle. The effectiveness of the performance is also compared against the PA, the MIMO, and the phased-MIMO (PMIMO) radars. SMIMO radar provides high flexibility for radar applications that is able to adapt to various conditions of the target to be detected and its environment. For example, for Tx-Rx with the number of antenna elements, i.e. K = L = 8, the range of the number of detectable targets for the PA, the MIMO, the PMIMO-Tx, and the PMIMO-Tx-Rx radars is: 4, (7, 32 ), (5 , 16), and (3, 8), respectively.


Angular Resolution, MIMO Radar, Number of Detectable Targets, Phased-Array, Subarray, Virtual Array


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