Method for realizing interference resistance and multipath restraint of navigation receiver with array antenna

Abstract

The invention provides a method for realizing interference resistance and multipath restraint of a navigation receiver with an array antenna. According to the method, an interference resistance and multipath restraint two-stage treatment structure adopting a digital correlator as a boundary for division is provided according to the difference of the influence of interference and multipath signals to navigation receiver baseband processing; in the first-stage processing, before de-spreading, a space-time covariance matrix of array receiving data is estimated at first, and the interference resistance is realized by utilizing a subspace projection technique according to the characteristic that the interference signal power is far greater than navigation signal power and noise power; in the second-stage processing, before de-spreading, the spatial smooth de-correlation treatment is carried out at first, then, a generalized sidelobe cancellation technology based on Householder transformation is utilized to carry out beam formation to realize the multipath restraint. Theoretical analyses and simulation results show that the cascade treatment technology can effectively suppress strong interference, and remarkably reduce the influence of the multipath signals to navigation receiver pseudo code measurement.

Description

technical field [0001] The present invention relates to the field of terminal equipment development, specifically a method for improving the anti-interference performance and tracking accuracy of navigation terminal equipment, which can be used in the development of satellite navigation system receiving terminals using array antennas and other equipment. Background technique [0002] Array antennas have incomparable advantages over traditional antennas. For example, they can obtain high spatial diversity gain, and more importantly, they can effectively realize spatial filtering, and can greatly increase the amount of spatial information acquisition, providing space signal detection and estimation. Strong support. Digital beamforming technology is to use the antenna array to use the method of digital signal processing to make the best reception of the space signal. It has the ability to align the maximum gain direction of the antenna array beam with the desired signal, zero t...

AI Technical Summary

Problems solved by technology

The traditional single-antenna multipath suppression technology mainly reduces the impact of multipath on the code tracking loop by shortening the lead-lag code interval in the pseudo-code delay-locked loop, or directly uses the correlation value between the received signal and the local reference waveform as the code tracking identification output In the indoor environment where the multipath delay is small or the power of the multipath signal is greater than that of the direct signal, its suppression ability will be limited to a large extent.

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