Robust Adaptive Transmit Beamforming under the Constraint of Low Peak-to-Average Ratio

Li, Hongtao; Ding, Zhoupeng; Tian, Sirui; Jin, Songpo

doi:10.3390/s22197278

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…Thus, we aim to minimize the PSL on the ground side while preserving the array response in the SOI direction. Then, the corresponding TBF problem can be formulated as the following min-max optimization problem [35],…”

Section: Transmit Beam Controlmentioning

confidence: 99%

A Software-Defined Radar for Low-Altitude Slow-Moving Small Targets Detection Using Transmit Beam Control

et al. 2023

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Low-altitude slow-moving small (LSS) targets are defined as flying at altitudes less than 1000 m with speeds less than 55 m/s and a radar crossing-section (RCS) less than 2 m2. The detection performance of ground-based radar using the LSS target detection technique can be significantly deteriorated by the diversity of LSS targets, background clutter, and the occurrence of false alarms caused by multipath interference. To address the LSS target detection problem, we have devised a novel two-dimensional electronic scanning active phased array radar system that is implemented in the software-defined radar architecture and propose a transmit beam control algorithm based on the low peak-to-average ratio (PAPR). Meanwhile, we devised a flexible arbitrary radar waveform generator to adapt to complex environmental situations. Field experiment results effectively demonstrate that our radar can be used to detect LSS targets. Moreover, an ablation experiment was conducted to verify the role played by transmit beam control and adaptive waveform optimization and generation in improving the system performance.

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Section: Transmit Beam Controlmentioning

confidence: 99%

A Software-Defined Radar for Low-Altitude Slow-Moving Small Targets Detection Using Transmit Beam Control

et al. 2023

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“…They have been successfully applied to various fields such as radar [1], wireless communication [2], satellite navigation [3], radio astronomy [4], speech enhancement [5], and seismic exploration [6]. Array patterns with low sidelobes are very important in these applications to cope with unwanted interferences [7][8][9]. One of the most widely used methods to synthesize patterns with low sidelobes is amplitude weighting (also called amplitude taper).…”

Section: Introductionmentioning

confidence: 99%

Fast Low-Sidelobe Pattern Synthesis Using the Symmetry of Array Geometry

Zhang,

Liu,

Zhou

et al. 2024

Sensors

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Array pattern synthesis with low sidelobe levels is widely used in practice. An effective way to incorporate sensor patterns in the design procedure is to use numerical optimization methods. However, the dimension of the optimization variables is very high for large-scale arrays, leading to high computational complexity. Fortunately, sensor arrays used in practice usually have symmetric structures that can be utilized to accelerate the optimization algorithms. This paper studies a fast pattern synthesis method by using the symmetry of array geometry. In this method, the problem of amplitude weighting is formulated as a second-order cone programming (SOCP) problem, in which the dynamic range of the weighting coefficients can also be taken into account. Then, by utilizing the symmetric property of array geometry, the dimension of the optimization problem as well as the number of constraints can be reduced significantly. As a consequence, the computational efficiency is greatly improved. Numerical experiments show that, for a uniform rectangular array (URA) with 1024 sensors, the computational efficiency is improved by a factor of 158, while for a uniform hexagonal array (UHA) with 1261 sensors, the improvement factor is 284.

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“…However, this TBF method is not yet suitable for RAB. In [30], Li imposed a PAPR constraint on transmit weights so as to avoid excessive energy attenuation and reduce the ripple of transmit weights. It has strong robustness to the steering vector mismatch.…”

Section: Introductionmentioning

confidence: 99%

Robust Low-Sidelobe Transmit Beamforming under Peak-to-Average-Power Ratio Constraint

Cai

Chu

Ding

et al. 2023

Sensors

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Transmit beamforming (TBF) provides the capability of focusing illuminating power in the desired directions while reducing the emitting power in undesired directions. It is significantly important in low-altitude and slow-speed small (LSS) radar, which usually suffers from heavy clutter and rapidly changing interference on the near-ground side. Due to nonideal factors such as an inaccurate target direction and array gain-phase error, the robustness of TBF is also necessary to consider in practical applications. In this paper, we provide a robust TBF method that enables sidelobe control in preset regions and possesses high transmit efficiency in virtue of the peak-to-average-power ratio (PAPR) constraint on transmit weights. To achieve robustness, a norm upper bound is introduced to limit the fluctuation of transmit weights, and the steering vector mismatch is also considered by using a spherical uncertainty set surrounding the nominal steering vector. As the proposed robust TBF is nonconvex because of the nonconvexity of both the objective function and constraints, we translate it into a series of convex subproblems via several kinds of convex relaxation schemes. In particular, based on the special structure of the objective function and constraints, the translation of the nonconvex problem into a tractable SOCP problem is realized by using the combination of the triangle inequality and Cauchy–Schwartz inequality. Numerical results demonstrate the improvement in the efficiency and robustness of the proposed TBF method in comparison with traditional TBF methods.

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Robust Adaptive Transmit Beamforming under the Constraint of Low Peak-to-Average Ratio

Cited by 5 publications

References 24 publications

A Software-Defined Radar for Low-Altitude Slow-Moving Small Targets Detection Using Transmit Beam Control

A Software-Defined Radar for Low-Altitude Slow-Moving Small Targets Detection Using Transmit Beam Control

Fast Low-Sidelobe Pattern Synthesis Using the Symmetry of Array Geometry

Robust Low-Sidelobe Transmit Beamforming under Peak-to-Average-Power Ratio Constraint

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