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A Joint Estimation Method of Amplitude-Phase Error and Signal DoA of UAV Array

A technology of array amplitude and phase error and joint estimation, which can be used in radio wave direction/bias determination systems, direction-determining directional devices, radio wave measurement systems, etc. Achieve accurate positioning performance and high resolution

Active Publication Date: 2022-02-15
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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  • A Joint Estimation Method of Amplitude-Phase Error and Signal DoA of UAV Array
  • A Joint Estimation Method of Amplitude-Phase Error and Signal DoA of UAV Array
  • A Joint Estimation Method of Amplitude-Phase Error and Signal DoA of UAV Array

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Embodiment Construction

[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 a method for jointly estimating the amplitude phase error and signal DOA of an unmanned aerial vehicle. source signal; under the condition that the observation baseline remains unchanged, the array structure is changed through the movement of the UAV, and the source signal is collected again after each array structure change to obtain multiple source signals; for each collected Source signal, calculate its covariance matrix, obtain the corresponding noise subspace through eigenvalue decomposition; reconstruct the quadratic optimization problem through the noise subspace and direction vector, construct the cost function, and obtain the combined amplitude and phase error and DOA through spectral peak search estimate. The invention can realize joint estimation of DOA and array amplitude and phase errors, correct the amplitude and phase errors, and improve the accuracy of passive positioning.

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 Patents(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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