Wideband cancellation of interference in a GPS receive array

Fante, Ronald L.; Vaccaro, J.J.

doi:10.1109/7.845241

Cited by 299 publications

(164 citation statements)

References 9 publications

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“…4(b) that reasonable isolation between the individual elements is achieved, which maintains above 18 dB across the BDS B3 band. It implies that it would have almost no effect on the performance of adaptive antennas adopting the space-time adaptive processing (STAP) algorithms [12]. Figure 5 shows the simulated and measured RHCP and left-handed CP (LHCP) gains in the broadside directions (θ = 0 • ) for the individual antenna elements.…”

Section: Resultsmentioning

confidence: 99%

Compact Four-Element Antenna Array Design for Beidou Navigation Satellite System Applications

Li¹,

Shi²,

Jian-ying³

et al. 2015

PIER Letters

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Abstract-In this letter, a compact four-element microstrip patch antenna array for BeiDou navigation satellite system (BDS) operation at the B3 (1268 MHz) band is proposed. High permittivity dielectric substrate and slit-loaded microstrip patch are used to reduce the antenna element size down to 40 mm × 40 mm which implies an aperture size of only λ 0 /6 × λ 0 /6 at the B3 band. The right-handed circularly polarized (RHCP) radiation is achieved by connecting two coaxial probes to a 0 • -90 • stripline hybrid. Four identical antenna elements are distributed with the same polarity and an inter-element separation of 80 mm (λ 0 /3 at the B3 band). The overall size of the antenna array, including the stripline feeding network and supporting ground plane, is only 140 mm × 140 mm × 5.5 mm. A prototype was fabricated and measured to verify the design concept. Simulated and measured results will be presented and discussed, showing that the proposed BDS antenna array is suitable for BDS applications.

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Section: Resultsmentioning

confidence: 99%

Compact Four-Element Antenna Array Design for Beidou Navigation Satellite System Applications

Li¹,

Shi²,

Jian-ying³

et al. 2015

PIER Letters

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show abstract

“…Our MVDR beamformer is considered for the pre-correlation stage of an antenna array spread spectrum (SS) system and is vulnerable to strong interference signals due to its weak received desired signal. The main benefit of using antenna array based adaptive beamforming in SS system is the extra degree of freedom in spatial and temporal domain for mitigation of interference while maintaining a main antenna beam to the desired signal [23,24]. However, this approach increases hardware and computational processing complexity.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Beamforming Algorithms for Cancellation of Multiple Interference Signals

Ong¹

2015

PIER M

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Abstract-This paper proposes a fast Minimum-Variance-Distortionless-Response (MVDR) beamforming algorithm for an antenna array for cancellation of multiple interference signals. The proposed algorithm uses Sample-Average Estimate (SAE) of the data covariance matrix and reduces its computational effort by applying the Matrix-Inversion-Lemma (MIL) to its covariance Matrix Inversion (MI) operation. The proposed algorithm is compared to two SAE-based algorithms: the Sample Matrix Inversion (SMI) algorithm that requires an MI operation and the Auxiliary Vector (AV) algorithm that does not need an MI operation. A non-SAE based algorithm using the Least Mean Square (LMS) method is also included for comparison. Simulation results show that the proposed algorithm converges slower than the SMI scheme but outperforms the AV and LMS schemes during the transient phase. Once convergence is achieved, the proposed algorithm converges to a better Mean Square Error than the rest of the algorithms evaluated.

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“…Spatial filters have the ability to modify its reception pattern, i.e., different amplification rates for signals from different directions of arrival (DOA). Based on the assumption that jamming signals and satellite signal have different DOA, adaptive nulling antenna can emphasize the desired GPS satellite signal and reject jamming signals [21]. The technique is effective for both narrow-and broad-band jamming signals.…”

Section: Gps Signal Structure and Existing Antijamming Methodsmentioning

confidence: 99%

“…The solution may be to combine this algorithm with spatial filtering methods such as those described in [21,22]. Another possibility is to integrate Kalman or particle filtering in the algorithm for estimating the phase/code delay.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Empirical Mode Decomposition and Blind Source Separation Methods for Antijamming with GPS Signals

Kamath

Lai

Zhu

et al.

2006 IEEE/ION Position, Location, and Navigation Symposium

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-The spread-spectrum structure of GPS signals provides inherent jamming tolerance for GPS receivers. In a hostile environment where jamming sites may be close to GPS users, a larger JSR is possible. How to achieve the desired accuracy for GPS-based systems in the presence of strong jamming is an important but outstanding problem. Here we propose to use the empirical-mode decomposition (EMD) method, originally developed for analyzing nonlinear and nonstationary signals, for antijamming. Given a jammed, noisy GPS signal, the EMD method identifies the innate undulations belonging to different time scales and sifts them out to yield a small number of intrinsic modes. We find that the EMD method typically works well when the jamming is stationary in that the GPS signal and jamming components are typically contained in different intrinsic modes. However, when the jamming is nonstationary, the GPS signal and jamming are spread over all the intrinsic modes. Our solution is to use the blind-source separation (BSS) method operating on the set of intrinsic modes from EMD. Simulations indicated that this combined EMD/BSS methodology works reasonably well for extracting the GPS signal in the presence of nonstationary jamming for JSR up 45dB.

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Wideband cancellation of interference in a GPS receive array

Cited by 299 publications

References 9 publications

Compact Four-Element Antenna Array Design for Beidou Navigation Satellite System Applications

Compact Four-Element Antenna Array Design for Beidou Navigation Satellite System Applications

Adaptive Beamforming Algorithms for Cancellation of Multiple Interference Signals

Empirical Mode Decomposition and Blind Source Separation Methods for Antijamming with GPS Signals

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