Optimal virtual array length under position imperfections

Mannesson, Anders; Bernhardsson, Bo; Yaqoob, Muhammad Atif; Tufvesson, Fredrik

doi:10.1109/sam.2014.6882324

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…The simplest channel sounding systems rely on directional antennas placed in a bistatic geometry to transmit and receive a probe signal that is matched filtered to produce an estimate of the channel impulse response. The concept of synthesizing an aperture larger than the physical size of an antenna can be leveraged to yield improved angular resolution performance for channel sounders [113][114][115][116][117][118][119][120][121]. Furthermore, a higher measurement bandwidth than the instantaneous bandwidth of the signal can be synthesized to improve delay resolution.…”

Section: A Frequency Domain Sa Soundersmentioning

confidence: 99%

An Overview of Advances in Signal Processing Techniques for Classical and Quantum Wideband Synthetic Apertures

Vouras¹,

Mishra²,

Artusio‐Glimpse³

et al. 2022

Preprint

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Rapid developments in synthetic aperture (SA) systems, which generate a larger aperture with greater angular resolution than is inherently possible from the physical dimensions of a single sensor alone, are leading to novel research avenues in several signal processing applications. The SAs may either use a mechanical positioner to move an antenna through space or deploy a distributed network of sensors. With the advent of new hardware technologies, the SAs tend to be denser nowadays. The recent opening of higher frequency bands has led to wide SA bandwidths. In general, new techniques and setups are required to harness the potential of wide SAs in space and bandwidth. Herein, we provide a brief overview of emerging signal processing trends in such spatially and spectrally wideband SA systems. This guide is intended to aid newcomers in navigating the most critical issues in SA analysis and further supports the development of new theories in the field. In particular, we cover the theoretical framework and practical underpinnings of wideband SA radar, channel sounding, sonar, radiometry, and optical applications. Apart from the classical SA applications, we also discuss the quantum electric-field-sensing probes in SAs that are currently undergoing active research but remain at nascent stages of development.

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Section: A Frequency Domain Sa Soundersmentioning

confidence: 99%

An Overview of Advances in Signal Processing Techniques for Classical and Quantum Wideband Synthetic Apertures

Vouras¹,

Mishra²,

Artusio‐Glimpse³

et al. 2022

Preprint

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show abstract

“…Some of the recent results related to synthetic-aperture measurements include an approach [2] for multiple-in multiple-out (MIMO) radar. An investigation into the impact of position errors is given in [3], however this work does not leverage an optical camera system as described here.…”

Section: Introductionmentioning

confidence: 99%

Wideband Synthetic-Aperture Millimeter-Wave Spatial-Channel Reference System With Traceable Uncertainty Framework

Vouras

Jamroz

Weiss

et al. 2023

IEEE Open J. Veh. Technol.

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This paper describes a wideband synthetic-aperture system and the associated Fourier processing for generating high-resolution spatial and temporal estimates of the signal propagation environment in wireless communication channels at millimeter-wave frequencies. We describe how to configure the synthetic aperture system for high angular resolution by sampling the progression of signal phase across a large planar area in space. We also show how to synthesize discrete measurements of the channel frequency response taken sequentially over a wide bandwidth to create power delay profiles (PDPs) in specified angular directions with high delay resolution. We provide a rigorous uncertainty analysis that can be made metrologically traceable to fundamental physical standards. This uncertainty framework can propagate the errors inherent in the measured signals through to the final channel estimates and derived parameters such as root-mean-square delay or angular spread. We illustrate use of the system in conjunction with two different analysis tools to extract both narrowband and wideband parameter estimates from the synthetic aperture, allowing its use as a stand-alone channel sounder or as a tool for verifying the performance of wireless devices.

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“…In [1], a random 3-D antenna array is used for DoA estimation, where, a virtual antenna array is formed by moving a single receive antenna in 3-D and estimating the antenna position coordinates from inertial measurement unit (IMU) measurements. Furthermore, in [2], [3], the effect of IMU sensor noise on the allowable time-duration of the virtual antenna trajectory, and consequently, on DoA estimation is provided. It has been shown that the length of the virtual antenna arrays is limited by the growing standard deviation of the antenna position errors.…”

Section: Introductionmentioning

confidence: 99%

Source localization using virtual antenna arrays

Yaqoob

Mannesson

Butt

et al. 2015

2015 International Conference on Location and GNSS (ICL-GNSS)

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Abstract-Using antenna arrays for direction of arrival (DoA) estimation and source localization is a well-researched topic. In this paper, we analyze virtual antenna arrays for DoA estimation where the antenna array geometry is acquired using data from a low-cost inertial measurement unit (IMU). Performance evaluation of an unaided inertial navigation system with respect to individual IMU sensor noise parameters is provided using a state space based extended Kalman filter. Secondly, using Monte Carlo simulations, DoA estimation performance of random 3-D antenna arrays is evaluated by computing Cramér-Rao lower bound values for a single plane wave source located in the far field of the array. Results in the paper suggest that larger antenna arrays can provide significant gain in DoA estimation accuracy, but, noise in the rate gyroscope measurements proves to be a limiting factor when making virtual antenna arrays for DoA estimation and source localization using single antenna devices.

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Optimal virtual array length under position imperfections

Cited by 7 publications

References 10 publications

An Overview of Advances in Signal Processing Techniques for Classical and Quantum Wideband Synthetic Apertures

An Overview of Advances in Signal Processing Techniques for Classical and Quantum Wideband Synthetic Apertures

Wideband Synthetic-Aperture Millimeter-Wave Spatial-Channel Reference System With Traceable Uncertainty Framework

Source localization using virtual antenna arrays

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