Hybrid satellite navigation anti-interference method and device

Abstract

Provided is a hybrid satellite navigation anti-interference method comprising the following steps of: 1) performing low-noise amplification treatment on a signal received by an antenna array; 2) performing down-conversion treatment on the signal subjected to the low-noise amplification treatment; 3) performing analog-to-digital conversion sampling on an intermediate-frequency signal; 4) under a spatial domain normal constraint condition, performing time-domain steering vector constraint on the intermediate-frequency signal to be a carrier frequency point of a navigation signal with a widest bandwidth, and determining a space-time filtering parameter range; 5) performing two-dimensional space-time anti-interference filtering treatment on the intermediate-frequency hybrid navigation signal; 6) performing digital-to-analog conversion on a filtered data signal; and 7) performing up-conversion treatment on an analog signal and then outputting the analog signal to a navigation receiver. The method adjusts the time-domain steering vector constraint under a space-time normal constraint anti-interference mode so that navigation signals with different systems are located in different main lobes of a space-time filter in order to achieve multisystem-compatible navigation anti interference, and is widely used in cooperation with various hybrid satellite navigation apparatuses.

Description

technical field [0001] The invention relates to a hybrid satellite navigation anti-jamming method and device. Background technique [0002] With the deployment of satellite navigation systems around the world, receivers compatible with multiple navigation systems have become a research hotspot; because the satellite signals reaching user terminals are very weak, they are often submerged in noise and are easily affected by complex electromagnetic waves. Environmental interference and man-made interference, so receiver anti-jamming technology compatible with multi-satellite navigation systems has gradually become a key technology in receiver design. [0003] The current satellite navigation anti-jamming technology is often based on the array antenna anti-jamming technology, which is divided into single-dimensional domain and multi-dimensional domain; the single-dimensional array antenna anti-jamming technology is a pure air domain anti-jamming technology, which only relies on ...

AI Technical Summary

Problems solved by technology

[0005] For multi-system navigation anti-jamming, both the space-time normal constraint anti-jamming mode and the space-time unconstrained anti-jamming mode have certain technical defects; this is because for multi-system navigation signals, different navigation systems Navigation signal intervals are distributed in the entire signal envelope, rather than being located in the center of the entire signal envelope like a single system navigation signal, and the traditional space-time filtering technology will generate on the overall filter output spectrum due to the introduction of time domain filtering. Certain notch frequency points, so when using the space-time normal constraint anti-jamming mode for multiple systems, it is difficult to make the time-domain notch frequency points well avoid the frequency points of useful signals. If the overall bandwidth of the mixed navigation signal is located in the main lobe of the time-domain filter to avoid the frequency notch of the time-domain filter, the order of the space-time filter should be significantly reduced to cater to the wider Bandwidth, in this case, will lead to the decline of the frequency resolution of space-time filtering, and then affect the performance of space-time filtering; and for the space-time unconstrained anti-jamming mode, although the degree of notch in the time domain is not as good as the space-time normal constraint anti-jamming mode In the interference mode, it is severe, but the linear phase characteristic of the time-domain filter has a little gap compared with the normal constraint. Moreover, because the space-time unconstrained anti-jamming mode adopts the constraint condition that the gain of the main antenna is constant and makes the total The output power is the smallest, so when the main antenna fails, the system cannot guarantee the normal satellite receiving work, which will have a subversive impact on the system

[0006] Invention patent 201310275142.4 discloses a space-time adaptive filter processing method, which reduces the fluctuation of coefficients by smoothing the space-time adaptive filter coefficients, makes the data output by the space-time filter more stable, and improves the reliability of the system However, it is not suitable for the anti-jamming treatment of multi-system hybrid satellite navigation

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