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Unmanned aerial vehicle array amplitude-phase error and signal DOA joint estimation method

A technology of array amplitude and phase error and joint estimation, which is applied to radio wave direction/deviation determination systems, radio wave measurement systems, direction-determining directional devices, etc. Achieve accurate positioning performance and high resolution

Active Publication Date: 2021-12-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, in practical applications, no matter the factors of the device itself or the actual environmental factors may cause errors in the array
When using the ideal array flow pattern for actual DOA estimation, it is inevitable to get direction finding results with large errors, or the direction finding results are invalid at all

Method used

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  • Unmanned aerial vehicle array amplitude-phase error and signal DOA joint estimation method
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  • Unmanned aerial vehicle array amplitude-phase error and signal DOA joint estimation method

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[0055] The present invention is described in further detail now in conjunction with accompanying drawing.

[0056]It should be noted that terms such as "upper", "lower", "left", "right", "front", and "rear" quoted in the invention are only for clarity of description, not for Limiting the practicable scope of the present invention, and the change or adjustment of the relative relationship shall also be regarded as the practicable scope of the present invention without substantive changes in the technical content.

[0057] For ease of description, the meanings of the symbols in this embodiment are as follows: expressed expectations, Represents the conjugate transpose operation, represents a transpose operation, represented by the vector The diagonal matrix formed by the elements in .

[0058] figure 1 It is a flow chart of the method for jointly estimating the amplitude-phase error of the UAV array and the signal DOA of the present invention. In this method, multiple...

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Abstract

The invention discloses an unmanned aerial vehicle array amplitude-phase error and signal DOA joint estimation method, which comprises the following steps of: carrying a single antenna array element on each unmanned aerial vehicle, and forming a receiving array by an unmanned aerial vehicle group consisting of a plurality of unmanned aerial vehicles to receive an information source signal; under the condition that the observation base line is not changed, changing the array structure through the movement of the unmanned aerial vehicles, and collecting the information source signal again after the array structure is changed every time to obtain a plurality of information source signals; for each collected information source signal, calculating a covariance matrix of the collected signal source signal, and obtaining a corresponding noise subspace through eigenvalue decomposition; and reconstructing a quadratic optimization problem through the noise subspace and a direction vector, constructing a cost function, and obtaining amplitude-phase error and DOA joint estimation through spectral peak search. According to the method, DOA and array amplitude-phase error joint estimation can be realized, the amplitude-phase error is corrected, and the accuracy of passive positioning is improved.

Description

technical field [0001] The present invention relates to the technical field of array signal processing, in particular to a joint estimation method of Direction of Arrival (DOA) and amplitude-phase error based on UAV swarm array. Background technique [0002] As an important branch of modern signal processing, array signal processing is a technical field that has developed rapidly in recent decades, and has been widely used in military and civilian fields such as radar, sonar, and wireless communications. Direction of Arrival estimation is one of the key technologies of array signal processing technology, and its main purpose is to estimate the position of space signal source. The DOA estimation technology develops rapidly, and the relevant theories and technologies are still being perfected. [0003] The ubiquity of array errors is an important reason for the difficulty of applying spatial spectrum estimation technology to practical engineering. In general, almost all DOA ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14G01S3/02
CPCG01S3/143G01S3/023G01S3/74G01S3/46
Inventor 李建峰张淇婷晋本周张小飞吴启晖
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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