Satellite Navigation Anti-jamming Steering Vector Automatic Correction System

Abstract

The invention discloses a satellite navigation anti-jamming steering vector automatic correction system. Using the invention, the on-site automatic correction of the steering vector can be realized without setting an external calibration source. The invention is realized by the following technical scheme: The module down-converts the received N-channel array antenna RF signals into N-channel intermediate frequency digital signal column vectors, and divides them into two channels, one is sent to the DBF processing module for weighting processing, and the other is sent to the steering vector correction processing module. When the steering vector correction processing module sends a correction control command to the satellite navigation digital receiver and the DBF processing module, the satellite navigation digital receiver and the DBF processing module cooperate with the steering vector correction processing module to perform steering vector correction processing, and the reconstructed kth satellite The satellite's local reference signal and N channels of intermediate frequency digital signals are subjected to correlation despreading processing, and the array steering vector error complex vector in the direction of the kth satellite is calculated and the target steering vector is corrected.

Description

technical field [0001] The invention relates to the field of satellite navigation anti-jamming signal processing, in particular to a satellite navigation anti-jamming steering vector automatic correction system. Background technique [0002] In the Global Navigation Satellite System (GNSS), the navigation signal reaching the ground is extremely weak. For example, the minimum guaranteed level of the navigation signal transmitted by the Beidou satellite to the output end of the receiver antenna is -163dBW. Due to the weakness of the navigation signal, the electromagnetic signal received by the receiver is very easy to encounter various active or passive interference in the process of its propagation, resulting in the decrease of the receiver sensitivity or even the inability to locate, which seriously affects the performance of the navigation system. Therefore, satellite navigation Anti-jamming technology has received extensive attention. [0003] At present, in addition to u...

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Problems solved by technology

[0007] In 2014, Qiao Chenglin et al. proposed a real-time calibration algorithm for steering vectors in the document Robust Beamforming Algorithm Based on Real-time Calibration of Steering Vectors. According to the principle that the real desired signal is orthogonal to the noise subspace, a cost function is established to realize the real-time correction of the steering vector. This system is obviously not suitable for satellite navigation signals, because the actual satellite navigation signals are completely submerged in noise, and the steering vector cannot be calibrated according to the subspace projection theory

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