Three-dimensional Multiple Signal Classification (3D-MUSIC) for Super-resolution FMCW Radar Detection

Zhao, Ermao; Zhang, Fangzheng; Zhang, Daocheng; Pan, Shilong

doi:10.1109/ieee-iws.2019.8804015

Cited by 13 publications

(7 citation statements)

References 5 publications

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“…Using this result in (37) LEMMA 4) As the noise part is straightforward, we consider only the signal part, i.e., the noiseless case. When the training sequence is as in (26), the received vector is ISI-free and y q (t + iN c T ) can be written as y q (t+iN c T ) = σ s G H [q]H q (t)F[q]e i . Then Ȳq (t) = y q (t)y q (t + N c T ) • • • y q (t + N c (N RF t − 1)T ) is equal to σ s G H [q]H q (t)F[q].…”

Section: Discussionmentioning

confidence: 99%

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Robust Gridless Estimation of Angles and Delays for Full-Dimensional Wideband mmWave Channels

Yang

Lin

2023

IEEE Open J. Signal Process.

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In this paper, we consider robust channel estimation for a millimeter wave (mmWave) massive MIMO system with uniform planar arrays (UPA). For many gridless angle estimation methods of mmWave channels, the channel gains needs to be time-invariant during training. We propose a gridless method that is applicable to time-invariant and time-varying channels, and the proposed method is robust to channel variations. This is done by employing time-varying precoders and combiners that are banded block Toeplitz (BBT) matrices. The advantage of time-varying BBT precoders is two-fold. First, with time-varying BBT precoding we can fabricate time-varying channels. Thus the channel can be estimated as if it is a time-varying channel whether the actual channel is time-varying or not. We will show that, thanks to fabricated time variation in the channel, a small training overhead can be used. Secondly, BBT precoding and combining preserve the shift invariance property of the received data matrix. Due to the preservation of shift invariance property, we can employ most existing direction finding methods for estimating the angles and delays, including low complexity gridless subspace based algorithms. Simulation results are given to show that the proposed time-varying BBT precoding provides robust and accurate channel estimates with a low complexity.

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Section: Discussionmentioning

confidence: 99%

“…Theorem 2. Suppose we design the training sequence as in (26) and use BBT precoder and combiner with prototypes as in (13). Then, Y (wb) in ( 33) is equivalent to the received matrix of a time-varying channel with path gain vector d [q] for q = 0, 1, • • • , K − 1.…”

Section: Transmissionmentioning

confidence: 99%

Robust Gridless Estimation of Angles and Delays for Full-Dimensional Wideband mmWave Channels

Yang

Lin

2023

IEEE Open J. Signal Process.

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“…The main weakness of the THz image compared to the X-ray and optical ones is the lower resolution. Nevertheless, due to the great advances of THz technology, recently the enhancement of the THz image resolution has been given a great focus by researchers either by improving the THz imaging techniques [16]- [19] or developing super resolution algorithms [20]- [24].…”

Section: Introductionmentioning

confidence: 99%

Defect Detection in Bi-directional Glass Fabric Reinforced Thermoplastics Based on 3D THz Imaging

Souliman¹

2022

Preprint

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Non-homogeneous, bi-directional glass fabric reinforced thermoplastic (GFRT) composites are used in the automobile industry to produce economic, environmentally friendly and recyclable vehicles. Despite the fact that GFRT materials have superior mechanical characteristics and lower manufacturing cost compared with traditional materials, they are prone to significant deformation and defect emergence during the forming/manufacturing of parts from prefabricated laminates. Some defects, especially hidden ones like delamination and consolidation defects, can significantly reduce the mechanical properties of the final parts. It is essential to use 3D non-destructive testing (NDT) technology to detect and identify such hidden defects. This research investigates the ability of 3D THz imaging to detect hidden defects (i.e., delamination and consolidation) in GFRT composite materials. Frequency modulated continuous wave (FMCW) technique is used to generate 3D-THz cross-sectional images. Non-defective and defective samples with a thickness of 1.5 mm have been measured with two 3D THz imaging systems operating in the frequency range from 238 to 316 GHz and from 499 to 733 GHz. In addition, a simulation of the reflected FMCW spectrum is presented to analyze the measurements and intercompare the performance of the two imaging systems. A systematic analysis in a large sample set demonstrates that a delamination defect with a thickness of 125 µm as well as a consolidation defect with a difference in thickness less than 0.4 mm can be successfully detected by the 700-GHz imaging system.

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“…Moreover, there are blind areas of front-looking detecting when the DBS and SAR technologies are adopted, which greatly limits the application in some fields [16]- [19]. In addition to the DBS and SAR systems, some super-resolution direction of arrival (DOA) solutions, such as multiple signal classification (MUSIC) and improved root MUSIC algorithms are proposed to increase the angular resolution, but a certain scale of array elements and enough signalnoise-ratio (SNR) are required to implement these technologies [20]- [21]. Overall, considering the cost performance, especially of the civil radar products, the traditional RARs are still primary choice for front-looking imaging application [22], and improve the angular resolution of RARs with a limited aperture size has always been an attractive research topic.…”

Section: Introductionmentioning

confidence: 99%

An E-Band Beam Sharpening Antenna Based on Monopulse Comparator

Teng

Wang

2021

IEEE Access

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An E-band antenna module and corresponding beam sharpening method is proposed to achieve high azimuth resolution for front-looking real aperture radar application. To achieve high angular resolution with a small antenna aperture size, a solution involving real beam and super-resolution is investigated. A monopulse antenna is developed to produce two coprime channels, which are essential for the subsequent beam sharpening in digital domain. A dual-aperture horn antenna and a monopulse comparator that make up the monopulse antenna are designed respectively, and the experimental prototypes are fabricated and tested. Experimental results show the antenna module can operate in the 75 to 80 GHz band, more than 20 dBi gain and 12 half power azimuth beamwidth can be maintained in the sum-patterns, and the null-depths are lower than -20 dB in the difference-patterns. Based on the measured sum and difference patterns, an azimuth super-resolution processing based on two-channel deconvolution is implemented. The simulation results show the sharpening ratio can achieve 12 dB with 0 dB signal-noiseratio and truncated half power beamwidth. Theoretically, the azimuth super-resolution of 0.8° can be achieved with 20 mm aperture size. The corresponding achievements are valuable in the follow-up E-band civil front-looking imaging system.INDEX TERMS E-band antenna, monopulse comparator, high angular resolution, super-resolution.

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Three-dimensional Multiple Signal Classification (3D-MUSIC) for Super-resolution FMCW Radar Detection

Cited by 13 publications

References 5 publications

Robust Gridless Estimation of Angles and Delays for Full-Dimensional Wideband mmWave Channels

Robust Gridless Estimation of Angles and Delays for Full-Dimensional Wideband mmWave Channels

Defect Detection in Bi-directional Glass Fabric Reinforced Thermoplastics Based on 3D THz Imaging

An E-Band Beam Sharpening Antenna Based on Monopulse Comparator

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