A two-stage blind adaptive anti-jamming algorithm for global positioning systems (GPS) is proposed in this study. The new cancels interferences by projecting the array received signals on orthogonal complement space of interferences. Then utilises CLEAN method to estimate direction arrivals GPS according period repetitive feature coarse/acquisition (C/A) code and form multi-beam, where each beam can point one signal. Test data simulation results show effectiveness algorithm.

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...

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...

Due to the extremely low power, GPS signal can be easily affected by interferences. In this paper, from point of adaptive array processing, we review existing spatial and space-time interference sup- pression methods which attempt mitigate interferences before receiver performs correlation. These comprise self-coherence restoral technique based on nature signal, minimum mean square error, power minimization technique, multipath mitigation using vertical etc. Also summarize their performance...

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....

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.

In this paper, a blind adaptive beamforming algorithm for Global Positioning System (GPS) is proposed, which combines the cyclic (CAB) with subspace technique. Compared CAB algorithm, new can generate high gain toward satellite direction and form nulls in directions of jammers by constraining both weight vector control to orthogonal space steering vectors jammers. The proposed has advantages such as no requirement any knowledge transmitted signals locations, fast convergence speed, low...

The signal multipath effect is one of the main reasons which lead to positioning error in Global Positioning System (GPS). Although differential technology can improve accuracy, GPS system still can't eliminate caused by signals, reference stations and users being different geographical environment. In light model, this paper presents a time delay estimation algorithm based on separation theory. Firstly, Doppler frequency estimated when unknown. Then, we use get information with addition,...

1 Jie Li, 2 Renbiao Wu, 3 Wenyi Wang, 4 Dan Lu 1, First Author College of Electronic and Information Engineering, Tianjin University, Tianjin, China, themilkyway79@126.com *2,Corresponding Key Lab for Advanced Signal Processing, Civil Aviation University China Affiliation, rbwu@cauc.edu.cn 3,4 wenyi_wang@126.com

Global Positioning System (GPS) has found wide application in many areas. However, due to the low power of received signal, GPS is susceptible a variety interferences and multipath. In this paper, two stage anti-jamming processor based on adaptive arrays proposed. Firstly, array signals are projected onto orthogonal subspace corresponding interference suppress interferences. Then free further processed by conventional data-independent beamforming enhance direct-path signal mitigate multipath...

Smart jammer is one of the most threat interferences for GPS receiver, so a smart suppression algorithm proposed in this paper, which combines spatial amplitude and phase estimation(APES) method high resolution coherent subspace estimation method. The new can resolve problem that APES unable to cancel multiple interferences, also provide accurate signal estimate. Simulation results show feasible

Space time adaptive processing (STAP) can be used to remove hostile jammers interfering for Global Positioning System (GPS) receivers, especially in the presence of jammer multipath. However, STAP filter bring distortion GPS signal because it does not have a uniform frequency response across operating band, which would dramatically reduce accuracy users' position. Based on homomorphic filtering new method is proposed compensate caused by filter. Finally, simulation results show effective.

1 Jie Li, 2 Renbiao Wu, 3 Dan Lu, 4 Wenyi Wang 1, First Author College of Electronic and Information Engineering, Tianjin University, Tianjin, China, themilkyway79@126.com *2,Corresponding Key Lab for Advanced Signal Processing, Civil Aviation University China Affiliation, rbwu@cauc.edu.cn 3,4 wenyi_wang@126.com

In this paper, a novel adaptive anti-jamming algorithm for Global Positioning System (GPS) is proposed, which uses the characteristics of GPS signal. Firstly, interference suppressed by projecting received signal onto orthogonal subspace. Then, interferencefree processed cyclic beamforming (CAB) in order to enhance Additionally, we make brief analysis conjugate correlation (CCC) matrix under finite snapshots. And estimation CCC introduce Hankel approximation method helps improve performance...

In Global positioning system (GPS), adaptive beamforming is an effective method for enhancing the desired signal and suppressing interferences simultaneously. The direction-ofarrival (DOA) of signal, however, as a priori information, required. Due to very lower signal-to-noise ratio GPS DOA estimation challenge problem. this paper, preprocess presented which Toeplitz approximates cross-correlation (CC) matrix. matrix approximation recovers structure, approximated used obtain more accuracy...