MIMO Radar Array Antenna with Transmit-Receive Subarrays

Abstract

Unlike the PMIMO radar, the transmit-receive (Tx-Rx) subarrays MIMO (TRSM) radar uses overlaping subarrays in Tx and Rx array so that it simultaneously combines the main advantage of the phased array radar (PA) i.e., high directional coherent gain, and the main advantage of the MIMO radar i.e., high waveform diversity gain. This paper has derived the radar performance formula such that Tx-Rx gain and SINR. The approach aims to overcome the beam shape loss, increase the transmit-receive gain, minimize the maximum peak sidelobe levels, narrow the half power beamwidth, increase directivity, and increase signal-to-noise-plus-interference ratio (SINR). This radar's performance is compared to the PMIMO radar in various methods such as equal subarrays, unequal subarrays, and optimum partitioning, the PA radar, and the MIMO radar. The numerical simulation and evaluation results show that the proposed radar has several advantages such as lowest the peak sidelobe level, narrow the half power beamwidth, and high directivity, so it is very robust against interference effects. When compared to the OPPM radar, as representative of the best-performing radars, this radar has an average performance improvement of MPSLL, directivity, and HPBW which are 21.5 dB, 2 dB, and 0.45 deg, respectively.

Subarrays of phased-array antennas for multiple-input multiple-output radar applications

“…Meanwhile, if the position of the element in state O is small (like the scheme of 7 OES with 1 element in state O), NVAR will be one or more of NVAR in the MIMO radar. The OES-based PMIMO_Tx radars generally have a higher SINR [13] due to the large amount of OES elements, but have a higher of the directional gain, such as the PAR radars [22], [23]. Therefore, a compromise must be made between NVAR and the amount of OES, which is proportional to the angle resolution, angle accuracy, and the numeral of detected targets, to conform to the situations of the desired target of radar.…”

“…This guarantees a compromise between the two extreme configurations and supports the application of the proposed radar concept, which can simultaneously provide SNR, angle resolution, maximum amount of detected targets, and beam schemes. The use of SAs is a compromise between Tx-Rx gain, SINR, and maximum range, as described in [22] and [23].…”