Multi-non-circular information source high-precision direct positioning method based on unmanned aerial vehicle

Abstract

The invention discloses a multi-non-circular information source high-precision direct positioning method based on an unmanned aerial vehicle, and belongs to the technical field of passive wireless positioning. Aiming at non-circular signals commonly used in a modern communication system, non-circular characteristics of the signals are utilized, non-circular phase information of the signals is considered when an algorithm model is established, a received signal matrix is expanded, and the purpose of increasing the degree of freedom is achieved; based on a data fusion idea in a direct positioning technology, data fusion of positions of a plurality of observation stations is considered, and high-precision positioning of a plurality of target sources can be realized by only one motion observation station; and a dimensionality reduction idea is introduced, so that the problem of high complexity caused by introduction of a non-circular phase is effectively solved. The method has the advantages that the problem of intermediate parameter and parameter matching of a traditional two-step method is avoided, the position information of a target source is directly obtained from the original receiving data layer, and the positioning precision is effectively improved; and the expansion of a received signal vector increases the degree of freedom of the algorithm and improves the resolution, and more information sources can be estimated at the same time.

Description

technical field [0001] The invention relates to the technical field of passive wireless positioning, in particular to an unmanned aerial vehicle-based multi-non-circular signal source high-precision direct positioning method. Background technique [0002] In the existing radiation source location methods, most of the radiation source signals are regarded as complex circular Gaussian signals, the signal model is too simple, and the characteristic information of the radiation source signal cannot be fully utilized, so the accuracy is low. Combining the signal characteristics when establishing the signal model, and designing the algorithm model in a targeted manner can improve the positioning accuracy of the algorithm. Non-circular signals are commonly used signal types in modern communication systems. Therefore, research on radiation source location methods for non-circular signal types is generally applicable and has very important practical significance. [0003] The tradit...

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Problems solved by technology

However, the existing direct positioning technology combined with signal characteristics is not universally applicable to signal types such as constant modulus signals and cyclostationary signals, and does not consider the problem of dimensionality reduction, and the algorithm complexity is high

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