Direction finding method for communication between a multi-antenna radio station and an unmanned aerial vehicle based on maximum likelihood

Abstract

The invention discloses a direction finding method for communication between a multi-antenna radio station and an unmanned aerial vehicle based on maximum likelihood. The method comprises the following steps: calculating and storing an array flow pattern offline; processing signal echoes, and calculating a covariance matrix; initializing parameters and a parameter set; designing and constructing a projection matrix, and projecting the projection matrix to a signal subspace to search an optimal value; updating the search times; performing displacement judgment on the target steering vector; and updating the number of iterations. The problems that the number of array element antennas is small, the antenna beam main lobe is wide, and a super-resolution method can improve the multi-information-source resolution capability under the condition of existing equipment are solved. The super-resolution method is applied to existing equipment, has an optimization function about the azimuth pitching matching problem, and is suitable for multi-antenna communication signal direction finding.

Description

technical field [0001] The present invention relates to the technical field of radar signal processing, and relates to the direction finding problem of unmanned aerial vehicle communication signals, specifically a direction finding method based on maximum likelihood multi-antenna radio station and unmanned aerial vehicle communication, which is suitable for cooperative unmanned aerial vehicle targets high-precision azimuth estimation. Background technique [0002] UAV is an emerging industry at this stage. Compared with manned aircraft, it has the advantages of zero casualties and low cost, which makes it gradually become a focus of general attention from all walks of life. Radio science and technology are effectively applied to UAVs, providing strong technical support for UAVs. With the continuous progress and development of information processing and fusion technology, navigation and flight control technology, sensor technology, and data link communication technology at t...

AI Technical Summary

Problems solved by technology

[0004] The multi-antenna source angle measurement of radio stations has the following three characteristics: 1) The source angle measurement is performed by using a series of prefixes of the communication signal, which belongs to the category of array multi-snapshot angle measurement; 2) The number of array element antennas is small, and the digital The main lobe of the beam is very wide, the side lobe is high and fluctuates greatly, and the traditional beamforming method is no longer suitable for multi-source positioning; 3) The array is required to realize the direction finding of multiple source targets, and the height of the source can be determined by the height of the source. Obtained by the altimeter (that is, the pitch angle of the source can be considered known)

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