Abstract
Interference suppression techniques have been intensively studied in nearly two decades due to their importance for maintaining the integrity and functionality of global navigation satellite system (GNSS). However, the interference suppression method applicable for the complex receiving environment in which there are multitype interfering signals has not been considered in most of the researches. To deal with this problem better, a cascaded multitype interferences suppression method using sparse representation and array processing is proposed. In the first stage, according to the sparsity of the narrowband and modulated wideband interference signals, a novel parallel multichannel signal interference suppression method based on matching pursuit (MP) algorithm and a design strategy for the overcomplete dictionary are proposed to mitigate the interferences with sparse features. Then, the minimum power distortionless response (MPDR) beamformer is employed in the second stage to suppress the residuary interferences (such as Gaussian noise interferences). Compared with existing algorithms, the proposed method can not only effectively suppress the interference arriving from the same direction with the desired signal and increase the Degree of Freedom (DoF) of the array antenna, but also introduce no distortion into the navigation signal. The effectiveness of the proposed method is illustrated by theoretical analysis and several simulation results.
Highlights
The global navigation satellite system (GNSS) has been widely used in military and civilian applications; the problems caused by the vulnerability of satellite navigation signals are increasingly serious
Signal sparse decomposition based on matching pursuit (MP) has better performance with the increase of the number of atoms in the overcomplete dictionary, the improvement of the performance for such ways is at the cost of the increase of complexity
In order to reduce the amount of computation while maintaining the accuracy, we propose a design strategy of the hierarchical adaptive overcomplete dictionary
Summary
The global navigation satellite system (GNSS) has been widely used in military and civilian applications; the problems caused by the vulnerability of satellite navigation signals are increasingly serious. Interference suppression techniques are necessary to ensure the reliability, accuracy, and continuity of GNSS services. According to the characteristics of the GNSS, there are two ways to improve the capability of radio frequency (RF) interference suppression [1]. We can improve the design of navigation satellites to enhance the interference suppression performance of GNSS, such as increasing the signal transmission power, optimizing the structure of the signal; but these methods are too complex, and the cost of time and materials is too huge. We can improve antijamming performance of GNSS receivers. These methods are gaining significant attention due to its effectiveness for interference from multiple, strong interferers plus multipath suppression
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