| Anti-jamming and high-precision are two important guarantees to ensure the positioning stability and accuracy of GNSS global satellite navigation system.They are two important indexes of high-performance satellite navigation receiver.How to meet these two indexes at the same time is the hotspot and difficulty of receiver design.The existing anti-jamming terminal mostly adopts the anti-jamming mode of antenna array,and the application of anti-jamming algorithm in antenna array will bring deviation to the measured value of receiver,which makes the high-precision positioning performance of receiver seriously deteriorated.Therefore,it has important theoretical significance and engineering application value to study the influence of anti-jamming terminal of anti-jamming antenna array on the measurement value of navigation receiver and its suppression technology.In this paper,the influence of anti-jamming signal processing of anti-jamming terminal anti-jamming antenna array on navigation measurement value and suppression technology are systematically studied.The main work and innovation achievements of this paper are summarized as follows:1.The traditional anti-jamming terminal will bring deviation to the navigation measurement value it receives,which hinders the anti-jamming terminal to achieve high-precision positioning.In this paper,a model of error transfer between the measurement deviation of anti-jamming terminal and precise single point positioning is established.By comparing the experimental results of the anti-jamming terminal in non-jamming environment,single broadband jamming environment,single sweep jamming environment and three broadband jamming environment with that of the general omnidirectional antenna in non-jamming environment,it is found that the anti-jamming terminal gives precise single antenna array to the anti-jamming terminal.The positioning error caused by point positioning can reach 3.8m,which can even make the positioning result unable to converge in the three interference environment,seriously reducing the positioning performance of anti-interference terminal in high-precision positioning.Therefore,it is very important to suppress the measurement error introduced by anti-interference terminal.2.The analysis model of measurement error of anti-jamming terminal is established under the ideal channel condition.In order to analyze the measurement deviation introduced by the anti-jamming algorithm,an analysis model of the measurement deviation of the anti-jamming terminal is established based on the basic theory of correlation function and channel response.The model provides a theoretical support for the specific analysis of the influence of signal direction and interference parameters on the measurement deviation.Combined with theory and simulation,the influence of signal direction,interference direction,interference power and interference type on measurement deviation is analyzed.In a specific scenario,the influence of the signal direction on the code phase deviation is about 1 m,and the influence on the carrier phase deviation is about 160 degrees.The interference direction has a maximum influence of 9 meters on the code phase deviation and200 degrees on the carrier phase deviation.The interference power has no obvious effect on the code phase deviation,and the maximum effect on the carrier phase deviation is about 10 degrees.The interference type has no obvious effect on the phase deviation of the code,but the maximum effect on the carrier phase deviation is about 10 degrees.3.In order to solve the problem of suppression of measurement deviation introduced by anti-jamming terminal anti-jamming processing,this paper provides a new idea for designing an unbiased anti-jamming algorithm,and specifically proposes an unbiased anti-jamming algorithm based on a special symmetrical formation.This algorithm can not only perform anti-interference processing without knowing any prior information,and maintain the interference suppression performance of the traditional PI algorithm.While inheriting the superiority of the PI anti-interference algorithm,it can effectively suppress the introduction of the traditional PI algorithm.The measured deviation can be obtained through simulation analysis.The algorithm proposed in this paper can basically achieve no deviation in code phase and carrier phase,the code phase deviation is 0.01 m,and the carrier phase deviation is within 0.2 degrees,which largely suppresses the code phase deviation and Carrier phase deviation.Moreover,the array non-strict symmetry condition and weight non-strict conjugate condition have no significant effect on the measurement deviation suppression performance of the algorithm proposed in this paper.Although the algorithm proposed in this paper has a good performance in the measurement deviation suppression,it will lose three quarters of degrees of freedom.However,compared with other unbiased algorithms with ”two-step” filtering structure,the algorithm proposed in this paper can simultaneously process all satellite signals with only one set of weights,reducing system complexity and greatly improving signal processing.s speed. |
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