Abstract
A compressive sensing based array processing method is proposed to lower the complexity, and computation load of array system and to maintain the robust antijam performance in global navigation satellite system (GNSS) receiver. Firstly, the spatial and temporal compressed matrices are multiplied with array signal, which results in a small size array system. Secondly, the 2-dimensional (2D) minimum variance distortionless response (MVDR) beamformer is employed in proposed system to mitigate the narrowband and wideband interference simultaneously. The iterative process is performed to find optimal spatial and temporal gain vector by MVDR approach, which enhances the steering gain of direction of arrival (DOA) of interest. Meanwhile, the null gain is set at DOA of interference. Finally, the simulated navigation signal is generated offline by the graphic user interface tool and employed in the proposed algorithm. The theoretical analysis results using the proposed algorithm are verified based on simulated results.
Highlights
The global navigation satellite system (GNSS) has been widely used in military, satellite attitude control mission, and civilian applications such as vehicle positioning and mobile navigation
+ V (k), where L depicts the number of light of sight (LOS) navigation satellite signal in the sky, ρl is signal power, Dl and Cl depict the navigation message bit and pseudo random noise (PRN) code of lth satellite with time delay τl, fl represents analog intermediate frequency (IF), and V(k) is interference term which consists of WB/NB interferences and Gaussian noise
Uniform rectangular array (URA) with half of wavelength spacing is utilized in the proposed system under no mutual coupling condition
Summary
The global navigation satellite system (GNSS) has been widely used in military, satellite attitude control mission, and civilian applications such as vehicle positioning and mobile navigation. The user can utilize a GNSS receiver to know the current location, including longitude, latitude, and time. The antenna array and pre- or postprocessing techniques are common methods to mitigate or cancel interferences. Only antenna array technique can obtain the best antijam performance (about 30 to 50 dB). The pre- or postprocessing techniques are widely used in current interior GNSS receiver design because of low cost and complexity. It is necessary to increase the number of antennas and time delay elements to obtain better antijam performance for antenna array processing [8]. The major challenges for a perfect GNSS receiver design include reducing the weight, complexity, and computation time in antenna array processing to maintain good acquisition performance and interference resistance
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