MIMO Phased-Array for SMTI Radar

Abstract

Waveform diversity techniques for radar have gained considerable interest over the past several years. Novel radar waveforms have been proposed to improve detection performance and metric accuracy (i.e., angle estimation performance). This paper explores the potential for using a waveform diversity technique known as Multiple Input, Multiple Output (MIMO) radar to improve the detection performance of slow moving surface targets from a moving radar platform. The MIMO radar system achieves superior performance by transmitting unique uncorrelated waveforms from each antenna subaperture as opposed to the traditional approach of transmitting a single coherent waveform across the entire aperture. The results show that the radar system minimum detectable velocity (MDV) can be reduced by exploiting the ability of a MIMO system to effectively increase the radar antenna aperture.

A Flexible Phased-MIMO Array Antenna with Transmit Beamforming

“…Like the general phased-MIMO array discussed in the literature [18][19][20][21], we divide the transmit array into multiple (K) subarrays which can be disjoint or overlapped, as shown in Figure 1. Each transmit subarray can be composed of any number of elements ranging from 1 to M. However, unlike the general phased-MIMO array discussed in the literature, in this paper all elements in each subarray are used to coherently emit the signal s k (t) at a distinct carrier frequency.…”

“…While MIMO array has many benefits over conventional phased-arrays, the former misses the directional gain. Intermediates between the two extremes were considered by jointly exploiting the benefits of the phased-array and MIMO array [18][19][20][21]. An idea by dividing the transmit array into multiple disjoint subapertures was introduced in [18].…”

“…Intermediates between the two extremes were considered by jointly exploiting the benefits of the phased-array and MIMO array [18][19][20][21]. An idea by dividing the transmit array into multiple disjoint subapertures was introduced in [18]. Closeform expressions to achieve wide transmit beampattern were further developed [20].…”

Joint Transmitting Subarray Partition and Beamforming for Active Jamming Suppression in Phased‐MIMO Radar

“…Considering the above‐mentioned drawbacks of conventional MIMO radar, a brand‐new radar technique that exploits both the merits of MIMO radar (for instance the waveform diversity) and phased‐array radar (for instance the coherent processing) is proposed (Bergin et al., 2008). In order to enable such a radar function integration, the transmitting array of radar system is partitioned into several subarrays, and each subarray is applied to coherently transmit a waveform that is orthogonal to the waveforms transmitted by other subarrays.…”

“…There are few opening literatures related to phased‐MIMO radar. The idea of dividing the aperture of transmitting array with collocated antennas into multiple subapertures is first introduced in (Bergin et al., 2008). Later, the beampattern characteristics and SINR gain of phased‐MIMO radar with overlapping subarray are particularly analyzed in (Hassanien & Vorobyov, 2010a, 2010b; H. Li & Himed, 2010; Deligiannis et al., 2015).…”