Abstract
Hybrid Multiple-Input-Multiple-Output(MIMO) phased array radar, or Phased MIMO radar, is recognized for its capacity to provide trade-off between transmit coherent gain and waveform diversity gain. Such trade-off can be flexibly implemented by changing subarray partition schemes of the system, which in turn enhances system performance. In this paper, a center-spanned subarray configuration is proposed with detailed steps to develop: First, the center element of the whole transmit array is chosen. Next, the surrounding region of center element is determined as the center subarray for subsequent spanning. Finally, the subarray partition is implemented through spanning subarrays around the center subarray. Both theoretical derivations and simulation results reveal that the hybrid MIMO phased array radar with the proposed center-spanned subarray configuration has lower sidelobe beampattern and higher Signal to Interference Noise Ratio(SINR) than that of equally or unequally overlapped subarray partitions.
Highlights
MIMORadar has received enduring attention from researchers on new radar systems due to its capacity of providing diversity to enhance system performance [1], [2]
We assume the target to be located at 0◦, and two interference sources are at −30◦ and −10◦
In this paper, a center spanned subarray configuration for Phased MIMO radar is proposed, which is generated by determining the index for the center of the array, developing the center subarray and spanning array elements from its two edges
Summary
Radar has received enduring attention from researchers on new radar systems due to its capacity of providing diversity to enhance system performance [1], [2]. Such diversity appears as spatial diversity in statistical MIMO Radar, which reduces Radar Cross Section (RCS) scintillation and improves detection of target echoes [3]. Colocated MIMO Radar are often compared with its phased array counterparts on whether the performance of one is superior to the other. MIMO radar achieves virtual aperture expansion and detects more targets via diversity gain brought by different waveforms, while phased array radar provides directional beam through coherent processing gain [5].
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