Satellite navigation receiver anti-interference method and system based on switched antenna array

Abstract

The invention provides a satellite navigation receiver anti-interference method and system based on a switched antenna array. The method specifically includes the following steps that S1, the switchedantenna array receives GNSS and interferential complex baseband signals; S2, switching operation is carried out on the switched antenna array, and the GNSS and interferential complex baseband signalsare transformed into a baseband signal after switching; S3, the switched baseband signal is sampled and transformed into a digital signal; S4, the digital signal is multiplied by a modulated local carrier signal after weight modulation and relevance addition is carried out, the time of relevance addition is synchronized with that of switching operation in the step S2, and an output array after relevance addition is obtained; and S5, synthetic beam forming is achieved. According to the satellite navigation receiver anti-interference method and system based on the switched antenna array, influence of channel deviation and mutual coupling on the switched antenna array is reduced, compared with conventional antenna arrays, better interference suppression performance and lower hardware cost are achieved. The invention is applied to the field of navigation receiver development.

Description

technical field [0001] The invention relates to the field of navigation receiver development, in particular to an anti-jamming method and system for a satellite navigation receiver based on switching antenna arrays. Background technique [0002] The satellite signal received by the navigation receiver is weak, and it is easily affected by various interferences. The interference signal may even cause the normal receiver to completely lose its service capability. For example, in the Kosovo War in 1999, the NATO allied forces led by the United States adopted a large number of GPS precision-guided cruise missiles, and the hit rate was very high in the early stage of the war; The missile missed its target. Digital beamforming technology is a technology that uses digital signal processing methods to use antenna arrays to optimally receive space signals. It can align the maximum gain direction of the antenna array beam with the desired signal and the null trap with interference. I...

AI Technical Summary

Problems solved by technology

For traditional antenna arrays, the degree of freedom and miniaturization of the array are opposite to each other. Increasing the degree of freedom of the array requires increasing the scale of the array, while the miniaturization of the antenna array will lead to problems such as coupling between array elements and reduced aperture resolution.

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