Research And Implementation Of Space-time Adaptive Anti-jamming Algorithm

In recent years, satellite navigation systems are widely used in civil and military fields, the problem has cropped up due to the satellite navigation signal is very weak, particularly vulnerable to intentional or unintentional interference from all sides, including the suppression of jamming and deception jamming. In order to ensure the safety of the satellite working environment, reliable, anti-jamming technology has becoming an urgent research needs. And improving the anti-jamming capability of the receiver by using effective anti-jamming technology also has great significance.Broadband interference and narrowband interference are mainly studied in this paper, as well as a series of anti-jamming technology for receiver: the space domain adaptive filtering technology, time domain adaptive filtering technology and space-time adaptive filtering technology. While the spatial, temporal adaptive interference suppression effect is poor, and limited to a few specific interference suppression, and space-time adaptive algorithm not only compensated freedom of the problem of inadequate for space adaptive algorithm,but also make up for the time-domain adaptive interference suppression effect on the broadband issue of poor results. Following aspects were presented in the paper:Firstly, a research of basic principles and guidelines of airspace adaptive algorithm, and the derivation and simulation of power inversion algorithm based on Linearly Constrained Minimum Variance optimization criteria are given.Secondly, the principle of time-domain adaptive interference algorithm was mainly studied, the deriving process and convergence performance analysis of the algorithm, a introduction of time-domain least mean square algorithm, the frequency domain adaptive anti-jamming algorithms was extended according to insufficient time domain least mean square algorithm, their spectral characteristics before and after interference suppression and the convergence characteristics of the time domain algorithm were showed via the simulation.Once again, the study of the principle, structure model, a Per-satellite Constraint and multi-constraint algorithm theory of space-time Adaptive adaptive algorithm was completed, it is investigated that the single-constrainted algorithm was applied on the centered circular array and the no centered circular array. Matlab simulation results show that the space-time adaptive anti-jamming algorithm has a superior ability to suppress jamming compared to space domain adaptive filtering. Finally, the implementation of space-time adaptive filtering algorithms was introduced in detail.