GNSS vector receiver anti-interference method based on despread respread algorithm

Abstract

The present invention provides a GNSS vector receiver anti-interference method based on the despread respread algorithm. The method comprises: performing projection of digital intermediate-frequency signals received by an array antenna to an interference orthogonal complement space, sending data after interference suppression into a receiver, giving out a receiver state vector and a tracking loop parameter initial value after the location solution is completed through a scalar tracking loop; performing predication of the receiver state vector and the tracking loop parameter, employing the predicated and obtained tracking loop parameter to construct reference signals, and performing coherent accumulation of the receiving signals and the reference signals to solve a weight vector; performing weighting of the receiving signals, and obtaining a correlated result after interference suppression; and sending a correlated result into a discriminator to perform updating and correction of the receiver state vector and the tracking loop parameter, etc. The GNSS vector receiver anti-interference method based on the despread respread algorithm can improve the location performance of a receiver while generating high gain, has the capabilities of suppression resistance and interference resistance, does not need to know satellite signals and interference direction information, is not sensitive to array manifold errors, and is good in robustness.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation anti-jamming, in particular to a GNSS (Global Navigation Satellite System) vector receiver anti-jamming method based on de-respreading algorithm. Background technique [0002] Anti-jamming research based on vector receivers is currently divided into two categories: signal processing and vector tracking loop simple cascade and deep combination. In 2012, the PLAN group proposed to detect deceptive jamming according to the change of The vector tracking loop can bridge the characteristics of the blocked real signal to ensure that the receiver cannot track the interference signal. In 2012, DLR tightly coupled the eigenbeam forming technology with the vector tracking loop to improve the stability of the vector receiver; in 2016, the multi-beam vector receiver was used to detect deceptive interference, but the method was more complicated; in 2015 Researchers at the University of Illinois in...

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Problems solved by technology

In 2012, DLR tightly coupled the eigenbeam forming technology with the vector tracking loop to improve the stability of the vector receiver; in 2016, the multi-beam vector receiver was used to detect deceptive interference, but the method was more complicated; in 2015 Researchers at the University of Illinois in the United States use the auxiliary position information of multiple vector receivers to detect deceptive interference, but this method requires multiple receivers and the communication protocol between the receivers needs to be guaranteed

In 2014, Li Qiang et al. of Harbin Engineering University proposed a method of using the signal predicted by the vector tracking loop as the reference signal in the cross-SCORE algorithm to form a weight vector to suppress interference. In 2016, Xu Mingshan et al. combined blind beamforming technology with vector The tracking loop is combined to improve the robustness of the vector tracking loop, but the performance of the above two methods will decrease in the complex interference environment of the vector tracking loop

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