A Beamforming Anti-jamming Method Based on Vector Tracking Loop

Abstract

The invention relates to the field of vector tracking loops of an array antenna and a receiver of a global positioning system, in particular to a beam forming anti-interference method based on a vector tracking loop. The beam forming anti-interference method provides local reference signals for a beam forming device based on an array antenna and ensures normal work of the vector tracking loop. The beam forming anti-interference method includes the steps that the array antenna receives signals; carrier waves in the satellite signals are stripped off; the optimal weight of an array is solved; pseudorange measurement values of all current tracking channels are calculated to obtain the position of a carrier; the vector tracking loop is built. All interferences irrelevant to the satellite signals can be restrained, and the beam forming mode in the method belongs to one of blind beam forming. The vector tracking loop can easily track the satellite signals with the interferences restrained, is not prone to losing lock and therefore guarantees robustness of the receiver of the global positioning system in an interference environment.

Description

technical field [0001] The present invention relates to the field of vector tracking loops for array antennas and global positioning system receivers, in particular to a vector tracking loop based on providing local reference signals for beamformers based on array antennas and ensuring the normal operation of vector tracking loops beamforming anti-jamming method. Background technique [0002] The signal power of the GPS satellite signal when it reaches the earth's surface is about -160dBW, so GPS is extremely vulnerable to interference signals. The GPS signal can obtain a processing gain of 43dB by relying on its spread-spectrum system. However, with the improvement of man-made jamming technology and the reduction of the cost of jamming equipment, the anti-jamming of satellite signals only relying on its spread-spectrum system can no longer meet the needs of users. In addition, existing GPS signals are transmitted on well-known frequencies with well-known modulation charact...

AI Technical Summary

Problems solved by technology

The MVDR method needs to know the spatial angle of the desired signal. In practice, due to the weak power of the GPS signal, the angle at which it arrives at the array antenna is not easy to estimate

The MMSE method does not need to know the direction of arrival of the satellite signal, but needs to know the local reference signal of the satellite signal

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