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GNSS space-time interference mitigation and attitude determination in the presence of interference signals.

Daneshmand S, Jahromi AJ, Broumandan A, Lachapelle G - Sensors (Basel) (2015)

Bottom Line: The use of Space-Time Processing (STP) in Global Navigation Satellite System (GNSS) applications is gaining significant attention due to its effectiveness for both narrowband and wideband interference suppression.The next stage estimates array attitude parameters based on detecting and employing GNSS signals that are less distorted due to the projection process.Simulated interfering signals were then added to the digitized samples in software to verify the applicability of the proposed receiver structure and assess its performance for several interference scenarios.

View Article: PubMed Central - PubMed

Affiliation: PLAN Group, Department of Geomatics Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive, N.W., Calgary, AB T2N 1N4, Canada. sdaneshm@ucalgary.ca.

ABSTRACT
The use of Space-Time Processing (STP) in Global Navigation Satellite System (GNSS) applications is gaining significant attention due to its effectiveness for both narrowband and wideband interference suppression. However, the resulting distortion and bias on the cross correlation functions due to space-time filtering is a major limitation of this technique. Employing the steering vector of the GNSS signals in the filter structure can significantly reduce the distortion on cross correlation functions and lead to more accurate pseudorange measurements. This paper proposes a two-stage interference mitigation approach in which the first stage estimates an interference-free subspace before the acquisition and tracking phases and projects all received signals into this subspace. The next stage estimates array attitude parameters based on detecting and employing GNSS signals that are less distorted due to the projection process. Attitude parameters enable the receiver to estimate the steering vector of each satellite signal and use it in the novel distortionless STP filter to significantly reduce distortion and maximize Signal-to-Noise Ratio (SNR). GPS signals were collected using a six-element antenna array under open sky conditions to first calibrate the antenna array. Simulated interfering signals were then added to the digitized samples in software to verify the applicability of the proposed receiver structure and assess its performance for several interference scenarios.

No MeSH data available.


Related in: MedlinePlus

Structure of the proposed receiver.
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sensors-15-12180-f002: Structure of the proposed receiver.

Mentions: The proposed receiver structure incorporates two interference suppression modes namely blind and distortionless and is shown in Figure 2.


GNSS space-time interference mitigation and attitude determination in the presence of interference signals.

Daneshmand S, Jahromi AJ, Broumandan A, Lachapelle G - Sensors (Basel) (2015)

Structure of the proposed receiver.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507627&req=5

sensors-15-12180-f002: Structure of the proposed receiver.
Mentions: The proposed receiver structure incorporates two interference suppression modes namely blind and distortionless and is shown in Figure 2.

Bottom Line: The use of Space-Time Processing (STP) in Global Navigation Satellite System (GNSS) applications is gaining significant attention due to its effectiveness for both narrowband and wideband interference suppression.The next stage estimates array attitude parameters based on detecting and employing GNSS signals that are less distorted due to the projection process.Simulated interfering signals were then added to the digitized samples in software to verify the applicability of the proposed receiver structure and assess its performance for several interference scenarios.

View Article: PubMed Central - PubMed

Affiliation: PLAN Group, Department of Geomatics Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive, N.W., Calgary, AB T2N 1N4, Canada. sdaneshm@ucalgary.ca.

ABSTRACT
The use of Space-Time Processing (STP) in Global Navigation Satellite System (GNSS) applications is gaining significant attention due to its effectiveness for both narrowband and wideband interference suppression. However, the resulting distortion and bias on the cross correlation functions due to space-time filtering is a major limitation of this technique. Employing the steering vector of the GNSS signals in the filter structure can significantly reduce the distortion on cross correlation functions and lead to more accurate pseudorange measurements. This paper proposes a two-stage interference mitigation approach in which the first stage estimates an interference-free subspace before the acquisition and tracking phases and projects all received signals into this subspace. The next stage estimates array attitude parameters based on detecting and employing GNSS signals that are less distorted due to the projection process. Attitude parameters enable the receiver to estimate the steering vector of each satellite signal and use it in the novel distortionless STP filter to significantly reduce distortion and maximize Signal-to-Noise Ratio (SNR). GPS signals were collected using a six-element antenna array under open sky conditions to first calibrate the antenna array. Simulated interfering signals were then added to the digitized samples in software to verify the applicability of the proposed receiver structure and assess its performance for several interference scenarios.

No MeSH data available.


Related in: MedlinePlus