Combined algorithm for interference suppression and signal acquisition in GNSS receivers

2017 ◽  
Vol 53 (4) ◽  
pp. 274-275 ◽  
Author(s):  
Feiqiang Chen ◽  
Junwei Nie ◽  
Shaojie Ni ◽  
Zhengrong Li ◽  
Feixue Wang
Keyword(s):  
Interference Suppression ◽  
Signal Acquisition ◽  
Gnss Receivers ◽  
Combined Algorithm

scholarly journals New Approach of High Sensitivity Techniques Using Collective Detection Method with Multiple GNSS Receivers

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3690 ◽  
Author(s):  
Maherizo Andrianarison ◽  
René Landry
Keyword(s):  
High Sensitivity ◽  
Optimization Method ◽  
Reference Station ◽  
Signal Acquisition ◽  
Knowing That ◽  
Collective Detection ◽  
Positioning Method ◽  
Gnss Receivers ◽  
Comparison Of The Results ◽  
Acquisition Method

The Collective Detection (CD) technique is a promising approach to meet the requirements for signal acquisition in GNSS-harsh environments. The CD approach has been proposed because of its potential to operate as both a direct positioning method and a high-sensitivity acquisition method. This paper is dedicated to the development of a new CD architecture for processing satellite signals in challenging environments. It proposes the best signal acquisition method used according to the reception conditions of the different receivers that can assist the user in difficulty. Knowing that the CD approach is beneficial in the case where the maximum of satellite signals can be combined, the proposed approach consists in choosing the best receiver(s) from several connected receivers to serve as a reference station, as smart cooperative navigation concept. New metrics of the CD with optimal weighting of visible satellites are exploited. Analysis of optimization method in order to use better satellites according to some defined parameters (elevation, C / N 0 , and GDOP) were carried out. Real GPS L1 C/A signals are exploited to analyze the efficiency of the proposed approach. A comparison of the results through the accumulation of some good satellites among all visible satellites have shown the effectiveness of this method.

scholarly journals A Two-Stage Interference Suppression Scheme Based on Antenna Array for GNSS Jamming and Spoofing

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3870 ◽  
Author(s):  
Zhang ◽  
Cui ◽  
Xu ◽  
Lu
Keyword(s):  
Antenna Arrays ◽  
Interference Suppression ◽  
Satellite System ◽  
Processing Technique ◽  
Subspace Projection ◽  
Music Algorithm ◽  
Two Stage ◽  
Noise Component ◽  
Music Signal ◽  
Gnss Receivers

Jamming and spoofing are the two main types of intentional interference for global navigation satellite system (GNSS) receivers. Due to the entirely different signal characteristics they have, a few techniques can deal with them simultaneously. This paper proposes a two-stage interference suppression scheme based on antenna arrays, which can detect and mitigate jamming and spoofing before the despreading of GNSS receivers. First, a subspace projection was adopted to eliminate the high-power jamming signals. The output signal is still a multi-dimensional vector so that the spatial processing technique can be used in the next stage. Then, the cyclostationarity of GNSS signals were fully excavated to reduce or even remove the noise component in the spatial correlation matrix. Thus, the signal subspace, including information of the power and the directions-of-arrival (DOAs) of the GNSS signals, can be obtained. Next, a novel cyclic correlation eigenvalue test (CCET) algorithm was proposed to detect the presence of a spoofing attack, and the cyclic music signal classification (Cyclic MUSIC) algorithm was employed to estimate the DOAs of all the navigation signals. Finally, this study employed a subspace projection again to eliminate the spoofing signals and provide a higher gain for authentic satellite signals through beamforming. All the operations were performed on the raw digital baseband signal so that they did not introduce additional computational complexity to the GNSS receiver. The simulation results show that the proposed scheme not only suppresses jamming and spoofing effectively but also maximizes the power of the authentic signals. Nonetheless, the estimated DOA of spoofing signals may be helpful for the interference source positioning in some applications.

Sign in / Sign up

Export Citation Format

Share Document