Multi-information-source direct positioning method based on unmanned aerial vehicle loading nested array

Abstract

The invention discloses a multi-information-source direct positioning method based on an unmanned aerial vehicle loading nested array, and the method comprises the steps: an unmanned aerial vehicle receiving a plurality of radiation source signals at different positions, and carrying out the sampling of the received signals; respectively calculating a received signal sampling covariance matrix ofeach position, and carrying out vectorization processing on the received signal sampling covariance matrix; fusing the vectorized observation signals to obtain processed virtual receiving signals; andconstructing a loss function of position estimation by adopting a direct correlation method, and obtaining a final radiation source position estimation result through grid search. According to the invention, secondary loss of position information can be effectively avoided, the positioning precision is improved, simultaneous positioning of multiple signal sources can be realized without additional information matching, the limitation of the degree of freedom of the array antenna can be broken through, and simultaneous positioning of multiple signal sources when the number of signal sources isgreater than the number of array elements is realized.

Description

technical field [0001] The invention relates to the technical field of passive positioning, in particular to a multi-source direct positioning method based on a nested array mounted on an unmanned aerial vehicle. Background technique [0002] For the radiation source positioning problem, most of the traditional ground investigation methods are based on ground mobile vehicles, combined with hand-held equipment, which not only requires a lot of manpower and material resources, but also is limited by the impact of complex environments and obstacles, with low positioning accuracy and long positioning time. Application is very limited. Compared with ground platforms, UAV-based aerial platforms have the advantages of being unaffected by the complex environment on the ground, having a wide observation range and strong flexibility. Therefore, research on the location of radiation sources based on UAVs has very important engineering application value. [0003] However, due to the e...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a multi-source direct positioning method based on the nested array loaded by the UAV. By organically combining the advantages of the array antenna with the high-precision direct positioning technology, the positioning of the traditional two-step positioning method is solved. The accuracy is limited and the problem of relying on additional information matching steps, and the existing direct positioning technology cannot realize the simultaneous positioning of multiple sources when the number of sources exceeds the number of array elements. Only one UAV can complete multi-signal positioning. Accurate positioning of the source has important engineering application value

Images