High Resolution FDMA MIMO Radar

Abstract

Traditional multiple input multiple output radars, which transmit orthogonal coded waveforms, suffer from rangeazimuth resolution trade-off. In this work, we adopt a frequency division multiple access (FDMA) approach that breaks this conflict. We combine narrow individual bandwidth for high azimuth resolution and large overall total bandwidth for high range resolution. We process all channels jointly to overcome the FDMA range resolution limitation to a single bandwidth, and address range-azimuth coupling using a random array configuration.

Integrated Sensing and Communications: Towards Dual-functional Wireless Networks for 6G and Beyond

“…Triggered by MIMO communication techniques, collocated MIMO radar was proposed ten years later at the 2004 IEEE Radar Conference by the MIT Lincoln Lab [18]. In MIMO radar, each antenna transmits individual waveforms instead of phase-shifted counterparts of a benchmark waveform [19]. This leads to enlarged virtual aperture, which improves the flexibility and the sensing performance compared to phasedarray radars.…”

“…where ∆D, ∆θ, and ∆f D stand for the range resolution, angular resolution, and Doppler resolution of the radar, and D max and P RF denote the maximum detectable range and the pulse repetition frequency (PRF), respectively. The capacity in (19) is simply a noiseless measure on how many point targets can be distinguished by the radar system. Consider an N t -antenna pulsed radar whose antenna array is uniformly and linearly placed.…”

“…It can be seen that the resolution of a radar is determined by its physical limit, or the maximum available amount of temporal, spectral, and spatial resources. This being the case, it is still not straightforward to see how the capacity in (19) trades off with the fundamental communication metrics, as it is specifically restricted to the identifiability of targets.…”

Optimisation of practically constrained waveforms for Rician target detection with multiple‐input‐multiple‐output radar

“…Different from the phased array radar, colocated MIMO radar can transmit arbitrary waveforms to gain extra degrees of freedom so as to achieve better detection and estimation performance [4][5][6]. MIMO radar has a lot of advantages, such as in fading mitigation [7], resolution enhancement [8][9][10][11], higher target localisation accuracy [12][13][14] and improved interference and jamming suppression capability [15]. In addition, MIMO radar has excellent performance in multiple target detection [16,17], parameter estimation [18][19][20], parameter identifiability [4] and target tracking [21][22][23] as well.…”

Super Directional Antenna—3D Phased Array Antenna Based on Directional Elements

“…The CST results for a 4 × 4 Yagi-Uda element array with a distance of λ between adjacent elements showed the achievement of a narrow azimuth and elevation beam width and, consequently, high directivity improvement-including coupling-in comparison to standard dipole arrays. Better performances could certainly be reached in separated radar architecture [15]-utilizing MIMO radar techniques [16] by spacing the element grid to an equivalent 2λ to significantly reduce the coupling to neglected values of less than −30 dB. Consequently, the high AP achieved increased the detection ranges, with a significantly lower RF intensity for each element-or, alternatively, achieved the same performance with a lower number of elements, according to the radar equation [17].…”