Abstract
This paper proposes a notional radar concept, named hybrid distributed multi-input multi-output (MIMO) radar, which brings together the distributed MIMO radar concept and the phased-array (PA) radar one. In particular, the hybrid distributed MIMO radar is composed of K sub-arrays which are randomly distributed with wide separations. Each sub-array consists of Q all-digital colocated antenna elements with T/R modules separated by half-wavelength inter-element spacing. In the transmitting end, each sub-array operating as a PA radar, is driven by an independent waveform that is orthogonal with waveforms transmitted by other sub-arrays. In the receiving end, the reflected signals are received by all elements in the whole array and jointly processed. The hybrid distributed MIMO radar is a promising technique, due to its capability of providing spatial diversity gains and high resolutions. In this paper, as the first stage of studying the target detection and localization problem for hybrid distributed MIMO radar, we present its signal model, and then develop the optimal detection theory and ambiguity function. Finally, sufficient numerical examples are provided to verify the effectiveness of the proposed radar system.
Highlights
As a new array radar paradigm, the multi-input multi-output (MIMO) radar has been focused by the radar community in the last two decades [1]–[5]
These conclusions of the hybrid distributed MIMO radar are coincident with the results presented in [26], [27]
The distributed MIMO radar can be seen as plenty of independent radar systems
Summary
As a new array radar paradigm, the multi-input multi-output (MIMO) radar has been focused by the radar community in the last two decades [1]–[5]. Q. Zhang et al.: Optimal Detection and AF of Hybrid Distributed MIMO Radar transmits a single waveform using multiple antennas, and can exploit coherent processing gain and flexible beamforming abilities. It is worth noting that aforementioned studies, including the HMPAR, phased-MIMO, TB-based MIMO and hybrid phased-MIMO radars, are associated with the colocated MIMO radar These hybrid concepts mainly focus on the signal design to achieve flexible transmit beampatterns. The sub-arrays are spaced with their phase centers separated by 500 wavelengths This radar concept can be seen as a simplified hybrid distributed MIMO radar. We develop the signal model of the proposed hybrid distributed MIMO radar considering its unique system configuration and using the spatial Swerling-I target model [40].
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