In this letter, we propose a novel dual-frequency miniaturized periodic element for creating dual-band frequency selective surface (FSS) having closely spaced bands of operation. Using and its complementary structure, the dual-bandstop dual-bandpass FSSs can be simultaneously created without extra effort. The mechanism responsible two resonances new way to make these closer is revealed. Based on revelation, newly proposed simply quickly designed compact in size have spaced. Furthermore, FSS...

DOA (Direction of Arrival) estimation is a major problem in array signal processing applications. Recently, compressive sensing algorithms, including convex relaxation algorithms and greedy have been recognized as kind novel algorithm. However, the success these limited by RIP (Restricted Isometry Property) condition or mutual coherence measurement matrix. In problem, columns matrix are steering vectors corresponding to different DOAs. Thus, it violates condition. The situation gets worse...

The automatic dependent surveillance-broadcast (ADS-B) is a surveillance system for air traffic management where aircrafts asynchronously broadcast the position and other information on same frequency band. However, this simple transmission protocol will result in inevitable overlapping among multiple ADS-B signals. In paper, with inherent characteristics of signal, an algorithm proposed to separate First, nonconvex blind adaptive beamforming problem formulated constraints are different from...

The diagonal loading method is a simple and e-cient to improve the robustness of beamformers. However, how determine ideal level has not been adequately addressed. In this paper, it observed in simulation that peak main beam moved with when there exists Direction Arrival (DOA) estimation error. Based on observation, novel proposed, tradeofi between interference suppression capability by controlling location beam. As long as DOA error less than half width beam, proposed beamformer will...

Direction-of-arrival estimation in the presence of gain and phase errors is investigated from retrieval (PR) perspective. In order to remove influence errors, they are isolated by taking absolute values elements compensated covariance matrix. Finally, formulated nonconvex PR optimization problem solved utilizing feasible point pursuit algorithm. Simulation results demonstrate effectiveness proposed

In Global Navigation Satellite System (GNSS), a spoofing attack consists of forged signals which possibly cause the attacked receivers to deduce false position, clock, or both. contrast simplistic spoofing, induced captures victim tracking loops by gradually adjusting it’s parameters, e.g., code phase and power. Then victims smoothly deviates from correct position timing. Therefore, it is more difficult detect than one. this paper, utilizing dynamic nature such gradual adjustment process, an...

Passive source localization has wide applications in array signal processing.In the practical applications, observations collected by an may be "arbitrary"-field signals, i.e., which are either mixed near-field and far-field signals or multiple signals.With a cross array, two-stage separated steering vector-based algorithm is developed to localize "arbitrary"field narrowband sources spherical coordinates.The key points of this paper are: i) different physical vectors

Automatic Dependent Surveillance-Broadcast (ADS-B) is vulnerable to spoofing interference which will lead the failure of Air Traffic Management (ATM) systems. This paper proposed an effective approach detect and suppress based on a cross-antenna array without estimating direction arrival (DOA) received signal. Firstly, location target by antenna array. Then azimuth elevation according are obtained locations central element Secondly, signal from estimated suppressed projecting onto orthogonal...

Shape fitting, including straight line and ellipse plays an important role in the (cylinder-) shape control system of silicon single crystal growth, because lines image contain horizontal circle center diameter information. This information can be used as variables so that grown approximates to a perfect cylinder, thus high-quality source materials. In this paper, we develop new fitting algorithms. The key points are follows. We formulate two-dimensional (2-D) binary into single-snapshot...

The combination of relay system and orthogonal frequency division multiplexing (OFDM) modulation is a promising way to increase capacity coverage area. We consider several joint subcarrier matching power allocation schemes maximize channel capacity, where the strategy decode-and-forward. formulate optimally problem as an optimization problem, which prohibitive in terms complexity. By separating allocation, with low complexity are proposed. proposed scheme 1 close upper bound very 2 higher...

It is well known that some global navigation satellite system (GNSS) signals operate on the aeronautical radionavigation services (ARNS) frequency band, which also utilized by other service signals, such as pulsed from distance-measuring equipment (DME) system. Thus, high-power DME signal, interference, will significantly degrade performance of GNSS. Some algorithms, including time blanking, notch filtering, and hybrid have been proposed to suppress interference. However, when density pulse...

As a part of modernization GPS, L5 signal is set up for civil aviation exclusively, and takes exclusive frequency band. However, the DME (Distance Measurement Equipment) already working at same band, makes pulse interference on with high power, which will cause degradation SINR (Signal to Interference Noise Ratio) failure in tracking acquisition signal. On suppression, traditional methods bring loss useful satellite data. Thus performance GPS receiver suffer from serious degradation. In this...

The weakness of ADS-B signals makes it vulnerable to jamming. In order suppress jamming, the paper proposes an anti-jamming approach with low-complexity based on a cross-antenna array. First, down-sampling digital IF received by array, and estimating covariance matrix using down-sampled snapshots. Because different duration features DOAs between 1090ES larger eigenvalues estimated mainly consist Then array weight vector could be conducted power inversion algorithm obtained from first step....

Power minimisation approach is an effective interference suppression algorithm for satellite navigation systems. It forms automatically deep nulls in the direction‐of‐arrival (DOA) of interferences without prior information about DOAs signals and interferences. However, it cannot provide flat gains other directions. Thus, desired may be partly suppressed when they locate shallow nulls. By combining eigenvalue thresholding method l1‐norm constraint, a new proposed systems that would...

Global navigation satellite Systems (GNSS) are highly susceptible to various interferences because of their inherent vulnerability. In these interferences, induced spoofing is very difficult be detected it can gradually drag off the tracking points without unlocking loops attacked receiver and cause victim obtain a wrong position and/or time information. Furthermore, also generate data, including simulation data real evaluate detection suppression algorithms. Existing generation algorithms...

In this paper, a robust null broadening algorithm is proposed for high dynamic global positioning system (GPS) interference suppression. The new reconstructs subspace by additional discrete sources of interferences, which could broaden the width nulls and adapt to rapid change directions in environment. Also would form beam pattern utilizing diagonal loading technique, improves performance conventional beamformer snapshot deficient. simulation results show that feasibility algorithm.