GPS (Global Positioning System) interference inhibition method based on single-channel multi-delay cross-correlation treatment

Abstract

The invention provides a GPS (Global Positioning System) interference inhibition method based on single-channel multi-delay cross-correlation treatment, which is realized by combining subspace projection and a conventional wave beam forming technology. In the method, firstly, interference is inhibited by utilizing an interference orthogonal complement space projection matrix; and secondly, satellite signals are strengthened by utilizing the conventional wave beam forming technology, i.e. as for data after projection, the satellite signal direction is estimated by an autocorrelation CLEAN algorithm, and the estimated satellite signal direction is utilized to carry out conventional wave beam forming. The method comprises the following steps of projecting signals received by an array antennato an interference orthogonal complement space; as for a cross-correlation matrix of the projected single-channel multi-delay data and the projected array data, estimating the satellite signal direction by the autocorrelation CLEAN algorithm; and carrying out wave beam forming on the projected data by utilizing the estimated satellite signal direction. The invention realizes interference inhibition and ensures non attenuation of satellite signals by fully utilizing data information without needing an inertia navigation auxiliary unit and has the advantages of simple realization and higher estimation accuracy. The satellite signal direction is not limited by the array number.

Description

technical field [0001] The invention relates to the field of satellite navigation anti-jamming. In particular, it relates to a GPS interference suppression method based on single-channel multi-delay cross-correlation processing without inertial navigation system and without attenuation of satellite signals. 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 adaptive antenna array is an effective GPS anti-jamming method. In GPS anti-jamming, common...

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 does not make full use of the time-domain multi-delay repetition of GPS C / A code signals. characteristics, when the number of snapshots is small, the estimation error will increase

Images