Overlapped Phased Array Antenna for Avalanche Radar

Tanha, Mandana Ardeshir; Brennan, Paul V.; Ash, Matthew; Köhler, Anselm; McElwaine, J. N.

doi:10.1109/tap.2017.2712183

Cited by 15 publications

(1 citation statement)

References 24 publications

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“…Content may change prior to final publication. studies have reduced the grating-lobe interference [20]- [22]. They can also be applied to sidelobe suppression.…”

Section: Introductionmentioning

confidence: 99%

Antenna Element Space Interference Cancelling Radar for Angle Estimations of Multiple Targets

et al. 2021

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This paper focuses on estimating the angle and size of different-sized targets using a radar system that estimates the angles of trucks, vehicles, bicycles, and pedestrians. The problem is that the presence of a sidelobe from the larger target degrades the accuracy of estimating the angle and size of the smaller target in multiple target detection. In this paper, a novel scheme, called antenna element space interference cancelling (AIC), is proposed for reducing the influence of the sidelobe. The performance of the proposed AIC radar system was evaluated through both computer simulations and experiments. The simulation results show that the proposed AIC radar system can estimate the angles of smaller targets within a 1-degree error, and the size estimation error is 1 dB. The experimental results also show that the proposed AIC radar is effective in detecting smaller targets that cannot be detected with traditional methods due to the sidelobes of larger targets.

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“…Content may change prior to final publication. studies have reduced the grating-lobe interference [20]- [22]. They can also be applied to sidelobe suppression.…”

Section: Introductionmentioning

confidence: 99%

Antenna Element Space Interference Cancelling Radar for Angle Estimations of Multiple Targets

et al. 2021

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GEODAR Data and the Flow Regimes of Snow Avalanches

Köhler

McElwaine

Sovilla³

2018

JGR Earth Surface

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GEOphysical flow dynamics using pulsed Doppler radAR (GEODAR), a custom radar system, images avalanches over the entire slope with high spatial and temporal resolution at the experimental test site Vallée de la Sionne in Switzerland. Between winter seasons 2009/2010 and 2014/2015, data have been acquired from 77 avalanches. These data sets describe a wide variety of avalanches, which we classify in terms of seven flow regimes and combinations thereof. These flow regimes expand on previous classifications, with four identifiable dense flow regimes (where interaction between granules and with the flow bed dominates dynamics) and two different dilute flow regimes (where interaction between snow particles and the air becomes dominant). There is a further regime identified where snow balls simply roll down the mountain. A cold dense regime and a warm shear regime behave like noncohesive granular flows with velocity shear throughout the flow. A sliding slab regime and a warm plug regime occur when cohesion dominates and causes the flow units to act as solid‐like objects sliding on a thin shear zone. An intermittent regime connects the cold dense regime with the suspension regime and is characterized by highly fluctuating density and surging activity. GEODAR enables localization of these flow regimes and transitions between them in time and space. We discuss flow regime transitions in terms of snow properties, topography, speed, and size of the avalanches. This paper also serves as a reference for the data set which is made publicly available and should prove to be an invaluable resource for the development of physically based avalanche models.

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Review and comparison of different limited scan phased array antenna architectures

Singhal

Hasan

2021

Circuit Theory & Apps

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Phased array antenna or beamformer plays key role in many emerging wireless applications, be it industrial such as 5G wireless communication and RADAR technology or commercial such as autonomous driving, imaging, and so on. Depending upon the application and design constraints such as power, area, and hardware cost, there are many architectures available in the open literature for designing a beamformer. The power consumption and the hardware cost become the two major limiting factors while choosing the specific phased array antenna for commercial applications. In order to reduce the hardware cost, designers try to limit the scanning range of the beamformer by reducing the number of control elements generally the phase shifters. These beamformers are called limited scan phased array antenna (LSPAA). These are proving to be useful in many commercial applications due to their reduced design cost. In this paper, we provide a detailed review of the various architectures present in literature for LSPAA design and a comparison between several of them with respect to scanning range, sidelobe level (SLL), and so on. In addition, a figure-of-merit is also proposed for comparison between the different architectures.

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Overlapped Phased Array Antenna for Avalanche Radar

Cited by 15 publications

References 24 publications

Antenna Element Space Interference Cancelling Radar for Angle Estimations of Multiple Targets

Antenna Element Space Interference Cancelling Radar for Angle Estimations of Multiple Targets

GEODAR Data and the Flow Regimes of Snow Avalanches

Review and comparison of different limited scan phased array antenna architectures

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