Global position system (GPS) interference suppression method based on multichannel one-way delay mutual correlation processing

Abstract

The invention relates to a global position system (GPS) interference suppression method based on multichannel one-way delay mutual correlation processing, which is realized by combining space projection and a conventional beam forming technology. Firstly, an interference orthogonal complement space projection array is utilized to restrain interference, and secondly, the conventional beam forming technology is utilized to enhance a satellite signal, i.e. an autocorrelation CLEAN algorithm is utilized for the data after projection to estimate the incoming direction of the satellite signal, and the estimated satellite signal direction is utilized to carry out conventional beam formation. The method comprises the following steps of: projecting the signals received by an array antenna to the interference orthogonal complement space; estimating the incoming direction of satellite signal by utilizing the autocorrelation CLEAN algorithm for the multichannel delay data after projection and the array data after projection; and forming the beam for the data after projection by utilizing the estimated direction of the satellite direction. The invention ensures zero decrement of the satellite signal, does not need an inertial navigation auxiliary unit, is simple to realize, enables the main lobe of an array directional diagram to aim at each satellite signal and is suitable for any arrays, and in addition, the estimation of the satellite signal direction is not limited by the array element number.

Description

technical field [0001] The invention relates to a GPS interference suppression method. In particular, it relates to a GPS interference suppression method based on multi-channel single-delay cross-correlation processing, which does not need an inertial navigation auxiliary unit, is simple to implement, and estimates satellite signal direction without being limited by the number of array elements. Background technique [0002] Global Positioning System (GPS for short) has been widely used in navigation, guidance, precision measurement and other aspects. However, because the received GPS signal is very weak, about 20dB lower than the receiver noise, it is easily affected by various intentional and unintentional interference signals. The existence of interference will cause the GPS receiver to lose lock, so that it cannot be located. Therefore, it is of great significance to study GPS anti-jamming technology. [0003] At present, interference suppression technology based on ad...

AI Technical Summary

Problems solved by technology

The anti-jamming algorithm based on the self-coherence characteristic of GPS C / A code only considers the existence of one GPS satellite signal. When multiple satellite signals exist at the same time, since the C / A code of each satellite signal has the same self-coherence characteristic, the The array pattern obtained by the method cannot form a main lobe in each GPS satellite signal direction

The GPS receiver must track at least 4 satellite signals to locate. The anti-jamming algorithm based on the self-coherence characteristics of the GPS C / A code cannot ensure that the main lobe of the array pattern is aligned with each satellite signal, and the satellite signal will be attenuated and cannot be captured. 4 satellites are tracked, so the positioning requirements cannot be achieved

The patent application with the application number 201010031382.6 discloses a technology of "Global Positioning System Interference Suppression Method Based on Self-Coherent MUSIC Algorithm". The performance of this technology is limited by the number of array elements. After a few hours, the performance of the technology disclosed in this patent application drops sharply

The patent application with the application number 201010100159.2 discloses a technology of "GPS interference suppression method based on single-channel single-delay cross-correlation processing". This technology can still estimate the satellite signal when the number of array elements is smaller than the number of satellites received by the antenna. direction, but this technology only uses the cross-correlation vector between the single-delay data of the reference array element after subspace projection and the projected data to estimate the direction of the satellite signal, and fails to make full use of the single-delay data of other array elements. When the array snapshot When the number is small, the satellite signal direction estimation error will increase

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