Blind robust STAP beam forming method and device for GNSS receiver

Abstract

The invention relates to the technical field of satellite navigation signal anti-interference, and discloses a blind robust STAP beam forming method and device for a GNSS receiver. According to the method, the direction of arrival of the GNSS signal does not need to be known in advance, the uncertainty level of DOA estimation of the expected signal is reduced by reconstructing the covariance matrix of the expected signal, the posterior probability density function of the DOA of the expected signal is approximated by using the previous DOA estimation result, then the steering vector is formed, and the direction of arrival of the GNSS signal is obtained. The steering vector is a weighted sum separated from steering vectors of different DOAs determined by an approximate posterior probability density function, then applying the steering vector to TDL coefficient constraint, and finally forming an STAP beam according to the solved optimal TDL coefficient. According to the invention, the approximate linear phase of the TDL can be obtained, the beam main lobe gain is provided in the estimation direction, and the measurement error in a receiver is effectively eliminated while a better output carrier-to-noise ratio is ensured.

Description

technical field [0001] The invention relates to the technical field of anti-interference of satellite navigation signals, in particular to a method and device for blind and robust STAP beam forming of a GNSS receiver. Background technique [0002] GNSS (Global Navigation Satellite System) services are used worldwide, but their performance is susceptible to interfering signals. In order to make the GNSS receiver work in the presence of interfering signals, an adaptive antenna array is usually used to eliminate the interfering signals by forming nulls in the interference direction. Furthermore, using a priori knowledge of the DOA (angle of arrival) of the GNSS signal, the adaptive array can form a main lobe in a specific direction to improve the quality of the received satellite signal. This type of filter is called an SOP (spatial processing only) filter, but the number of anti-jamming filters is limited by the number of antenna elements. [0003] In the related art, STAP (...

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Problems solved by technology

[0006] The invention provides a blind robust STAP beamforming method and device for a GNSS receiver, which solves the technical problem of how to effectively eliminate the observation error of the STAP algorithm while ensuring an optimal output carrier-to-noise ratio

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