In this paper, we investigate the problem of joint design transmit and receive beamforming weight vectors for multiple-input multiple-output (MIMO) radar systems in presence signal-dependent interference, which is distinct from its existing counterparts focusing on temporal codes waveforms spatial-temporal filter. The formulated as output signal-to-interference-plus-noise ratio (SINR) maximization subject to a similarity constraint weight, such that good beampattern can be guaranteed. Due...

In this paper, a procedure for the null broadening algorithm design with respect to nonstationary interference is proposed. contrast previous works, we first impose nulls toward regions of based on reconstruction interference-plus-noise covariance matrix. Additionally, in order provide restriction shape beam pattern, similarity constraint enforced at stage. Then, adaptive weight vector can be computed via maximizing new signal-to-interference-plus-noise ratio (SINR) criterion subject...

Hybrid digital/analog architecture and low-resolution analog-to-digital/digital-to-analog converters (ADCs /DACs) are two low-cost implementations for large-scale millimeter wave (mmWave) systems. In this paper, we investigate the problem of constant-envelope transmit beamforming multiple-input multiple-output (MIMO) radar system, where array adopts a hybrid with small number RF chains receive fully digital ADCs. We derive relative entropy between probability density functions associated...

Radio frequency-based (RF-based) detection methods are currently the main means of countering drones. However, these prevalent approaches frequently exhibit deficiencies in effectively addressing noise and interference, making them potentially unsuitable for application realistic urban environments. This paper proposes a generalized RF signal-enhanced framework that explicitly addresses interference. We decompose signal into three components uniformly integrate proposed decomposition. To...

In this article, we consider the uniform circular arrays (UCAs) with number of antenna elements insufficient to apply traditional beamspace-based algorithms, which are labeled as sparse UCAs. For such UCAs, propose a new hybrid approach for 2D direction-of-arrival (DOA) estimation in presence mutual coupling. Using manifold decomposition technique, present two formulations steering vector coupling Then, introduce adaptations modified array rank reduction algorithm. This leads an algorithm...

Tapered impedance loading is studied to suppress edge scattering from a rectangular metallic plate. Associated with the pattern multiplication theorem, simple approach this problem proposed assuming current distribution of target broken into an array overlapping triangles. This tapered realised by geometric variations based on frequency-selective surfaces concepts. Electromagnetic back-scattering as-prepared plate analysed for both horizontal polarisation and vertical polarisation, compared...

A novel adaptive beamforming algorithm against large direction-of-arrival (DOA) mismatch without using optimization toolboxes is proposed. In contrast to previous works, this new beamformer employs two reconstructed matrices, the interference-plus-noise covariance matrix and desired signal-plus-noise matrix, instead of their real sample respectively. These matrices are used obtain an orthogonal subspace, which interference subspace contains signal subspace. Without estimating steering...

A new method based on the matrices reconstruction is proposed to deal with coherent signals in presence of unknown mutual coupling. By using a novel expression spatial covariance matrix coupling, interference‐plus‐noise and desired signal can be reconstructed via estimating autocorrelation envelope coupling an iteration process. Based criterion maximum output signal‐to‐interference‐plus‐noise ratio, subspace orthogonal interference then found out by these matrices. Therefore, noise let...

This paper investigates the problem of spectrally compatible waveform design for multiple-in multiple-out (MIMO) radar transmit beampattern formation, subject to peak-to-average-power ratio (PAR) and similarity constraints. Since formulated optimization minimizing Integrate Sidelobe Level (ISL) energy stop-band frequencies is NP-hard, an auxiliary variable first introduced modify non-convex into a bi-quasiconvex problem, then approximated alternating directions method multipliers (A-ADMM)...

Based on the beamspace transform and rank reduction theory (RARE), a fast direction of arrival (DOA) estimation algorithm in presence an unknown mutual coupling is proposed for uniform circular arrays (UCAs). Via relying symmetry expanding into limited number phase modes, azimuth estimates are able to be obtained without exact knowledge coupling. Then, by using special structure matrix characteristic coe-cients, elimination spurious estimations coe-cients handled simultaneously. The...

In a sky-wave radar, the strong ocean clutter may cover up echo signal of slow-speed targets. This letter proposed knowledge-aided suppression method for radar. The uses radar carrier frequency and pulse repetition interval as prior knowledge to reconstruct clutter. reconstructed is combined with ionosphere phase perturbation model. resulting included in optimal filter design. simulation results show that output signal-to-clutter plus noise ratio this 2.507 dB larger than methods by others.

This paper presents a new array response control algorithm named complex-coefficient weight vector orthogonal decomposition (C <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> -WORD), and its application to robust sidelobe synthesis in the presence of steering mismatch. The proposed C -WORD is modified version existing WORD approach. We extend by allowing complex-valued combining coefficient -WORD, then determine optimal maximizing white...

The performances of most previous beamformers degrade dramatically when the desired signal (DS) high signal-to-noise ratio (SNR) is present in training data with direction-of-arrival (DOA) mismatch. In this paper, two new robust adaptive are presented to achieve robustness over a large range SNR. basic ideas based on interference-plus-noise covariance matrix reconstruction and different steering vector estimation methods. Compared method, they have good performance while less computational...

In this paper, we investigate the problem of transmit beam-pattern design for MIMO radar with one-bit DACs. Based on Fast Fourier Transform (FFT), propose an alternating minimization (AM) method to minimize weighted squared-error (WSE) between designed beampattern and a given one. particular, approximation approach achieve high-quality solution constraint. Finally, numerical simulations demonstrate that effectiveness proposed method.

Ionospheric phase decontamination is the key factor to improve target detection capability of skywave radar. In this paper, a new ionospheric algorithm proposed based on sparse reconstruction. We transform problem estimating contamination into optimization problem, then solve it rapidly by iterative method get modulation frequency caused contamination. Compared with existing algorithms, in paper has following advantages: 1. higher accuracy obtained under situation both fast fluctuation and...

A reduced-dimensional MUSIC (RD-MUSIC) algorithm is proposed to reduce the computation of blind joint direction-of-arrival (DOA), polarization and mutual coupling parameters estimation based on spatially spread sensitive uniform linear array (ULA). This works in two steps. In first step, DOA parameter are separated from through matrix transformation, which then estimated by RD-MUSIC algorithm. second coefficients via eigen-decomposition with modulus constraint. Simulation results show...

This paper focuses on the problem of coexistence between a colocated multiple-in multiple-out (MIMO) radar and down-link communication systems. We propose an iterative algorithm to minimize Cramer-Rao Bound (CRB) direction arrival (DOA) target, accounting for energy similarity constraints. More Specifically, at each iteration this algorithm, waveform is obtained with aid alternating method multipliers (ADMM) then weights are by exploiting block successive upper-bound minimization (BSUM)....

To reduce the large computation of joint direction-of-arrival (DOA) and polarization parameters estimation based on electromagnetic vector sensor array, a reduced-dimensional MUSIC algorithm with modulus constraint (MC-RDMUSIC) is proposed. The MC-RDMUSIC estimates DOA in two separate steps. In step one, parameter separated from estimated by algorithm; two, cost function constructed according to condition are obtained closed-form formulas. Compared traditional algorithm, avoids spectrum peak...

In the presence of direction arrival (DOA) mismatch, performance generalized sidelobe canceller (GSC) may suffer severe degradation due to gain loss desired signal in main array and cancellation. this paper, one effective GSC algorithm is proposed improve robustness against DOA mismatch signal. Firstly, two subspaces, which contain signal's actual steering vectors auxiliary arrays, can be obtained by using range information angle come from. By rotating these arrays estimated based on maximum...