Anti-interference method and system for receiving signal of array antenna

Abstract

The invention discloses an anti-interference method and a system for receiving signals of an array antenna. The method comprises the following steps: determining a transition relationship between thefirst covariance matrix and the second covariance matrix, wherein the first covariance matrix is a covariance matrix of the actual signal received by the array element in the array antenna, wherein the second covariance matrix is a covariance matrix of the signal received by the array element in the array antenna when the variation of the interference signal is assumed to be subject to the triangular probability distribution; calculating the weight vector of each array element in the array antenna by adopting a power inversion algorithm according to the transition relationship between the first covariance matrix and the second covariance matrix; obtaining signals received by each array element in the array antenna; processing the signals received by each array element by using the weight vector of each array element to obtain the signal after removing the interference. The anti-interference method and system for receiving signals of an array antenna can suppress the interference signalreceived by the receiver under the condition of high-frequency vibration or high-speed motion.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method and system for removing interference from signals received by an array antenna. Background technique [0002] The global satellite navigation system has been widely used because of its high navigation accuracy and the advantages of not accumulating errors over time. However, when the satellite navigation signal reaches the GNSS receiver, the power is 20dB lower than the environmental background noise, so it is extremely vulnerable to strong interference signals. . At this time, the GNSS receiver will not be able to capture satellite navigation signals normally, which will inevitably lead to the failure of the receiver to search for satellite positioning. [0003] Therefore, array antennas are commonly used at the receiver end to suppress strong interference signals. In engineering, the linear constrained minimum power criterion is often used to adaptively generate null...

AI Technical Summary

Problems solved by technology

However, when the carrier of the GNSS receiver is in the state of high-frequency vibration or high-speed motion, the direction of the interference signal will change rapidly in a short period of time, and the above algorithm may not be able to converge, resulting in the interference signal not being effectively suppressed in time

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