Method for improving anti-jamming performance of satellite navigation array antenna

Abstract

The invention provides a method for improving the anti-jamming performance of a satellite navigation array antenna, and aims to provide an anti-jamming method which can effectively suppress strong jamming and enhance the output signal-to-noise ratio of the antenna. The invention is realized by the following technical scheme: in a created array signal receiving model, each channel is sequentially subjected to a frequency conversion channel, A / D analog-digital conversion and data preprocessing time delay to obtain continuous space-time two-dimensional snapshot data, a plurality of virtual arrays are formed by data replication, each virtual array corresponds to an independent space-time two-dimensional anti-jamming module, each of the anti-jamming modules selects a different array element as the main array element and takes signals received by a channel of the array element as reference data, the space-time joint adaptive anti-jamming based on the power inversion is realized, the outputs of the anti-jamming modules are directly added by a secondary beam combining module, and finally the synthesized digital intermediate frequency signal is subjected to D / A digital-analog conversion and an up-conversion module to output an analog signal to a satellite navigation receiver at the back end.

Description

technical field [0001] The invention relates to the signal processing research field of satellite navigation antennas, in particular to a satellite navigation array antenna self-adaptive anti-jamming technology, which is suitable for satellite navigation array anti-jamming antennas. Background technique [0002] With the development of science and technology, various modes of satellite navigation systems are used more and more widely. The received signal power of the global positioning system GPS is very low, and it is often subject to various intentional or unintentional interferences in an increasingly complex electromagnetic environment. These interferences make satellite navigation receivers unable to effectively receive signals transmitted by multiple satellites to perform positioning calculations, posing a serious threat to the availability, continuity and integrity of satellite navigation. [0003] At present, adaptive array has become a key technology of the new gene...

AI Technical Summary

Problems solved by technology

However, the existing satellite navigation array antennas all fix one antenna element as the main element, and the performance of this element will directly affect the anti-interference ability of the entire antenna. In extreme cases, failure of this element will lead to failure of the entire antenna , the robustness is poor; at the same time, due to the influence of various physical processing factors (such as the actual antenna array position, filter difference, etc.), fixed main array elements may cause antenna pattern distortion, making the output signal noise after anti-jamming It is relatively low, which eventually leads to the fact that the anti-jamming performance of the array antenna cannot meet the actual use requirements of the satellite navigation receiver

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