Multi-information-source high-precision direct positioning method based on unmanned aerial vehicle mobile monitoring

Abstract

The invention relates to a multi-information-source high-precision direct positioning method based on unmanned aerial vehicle mobile monitoring. The method comprises the steps: receiving a plurality of radiation source signals at L different positions by an unmanned aerial vehicle and sampling the received signals; respectively calculating a received signal covariance matrix of each position, andcarrying out eigenvalue decomposition on the received signal covariance matrix; determining the optimal weight of each observation position based on the eigenvalue obtained by eigenvalue decompositionand the corresponding eigenvector; and establishing a loss function by utilizing orthogonality of the steering vector and the noise subspace, performing weighted fusion on projection results of the noise subspace from the steering vector to the L observation positions, and obtaining a radiation source position estimation result through searching. According to the method, the problems that a traditional two-step positioning method is limited in positioning precision and depends on an additional information matching step can be solved, radiation source position information is directly extractedfrom an original data layer, observation information of multiple positions is optimally fused, high-precision and accurate positioning is completed, and the method has important engineering application value.

Description

technical field [0001] The invention relates to the technical field of passive positioning, in particular to a multi-source high-precision direct positioning method based on UAV mobile monitoring. Background technique [0002] For radiation source positioning platforms, most of them are based on ground monitoring stations combined with ground mobile vehicles and handheld devices, which are greatly affected by the complex environment on the ground, with low positioning accuracy and long positioning time, which are very limited in practical applications. The UAV-based aerial platform has the advantages of less clutter interference, wide observation area, and strong mobility, which can effectively improve the efficiency and success rate of radiation source positioning. Therefore, it is very important to study UAV-based radiation source positioning. practical significance. [0003] Due to the existence of intermediate parameter estimation steps in the traditional two-step posit...

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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention provides a multi-source high-precision direct positioning method based on UAV mobile monitoring, which can solve the problem that the traditional two-step positioning method has limited positioning accuracy and relies on additional information matching steps. Directly extract the location information of the radiation source from the original data layer, optimally integrate the observation information of multiple locations, and complete high-precision and precise positioning, which has important engineering application value

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