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Passive synthetic aperture-based multi-unmanned aerial vehicle cooperative direct positioning method

A multi-drone, synthetic aperture technology, applied in positioning, radio wave measurement systems, instruments, etc., can solve the problems of information loss, affecting positioning performance, increasing positioning error and processing time, etc., to improve positioning accuracy and improve Discrimination ability, effect of avoiding data association problems

Pending Publication Date: 2022-06-17
PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU
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AI Technical Summary

Problems solved by technology

According to information theory, certain uncertainties will be introduced in the processing link from the original data to the final estimation result, which will lead to information loss and affect the positioning performance. Especially when there are multiple targets, data association or human intervention is required. Will further increase positioning error and processing time

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  • Passive synthetic aperture-based multi-unmanned aerial vehicle cooperative direct positioning method
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  • Passive synthetic aperture-based multi-unmanned aerial vehicle cooperative direct positioning method

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Embodiment Construction

[0061] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments:

[0062] like figure 1 As shown in the figure, a passive synthetic aperture-based cooperative direct positioning method for multiple UAVs disclosed in the present invention requires an array antenna to be installed on each UAV, and each UAV transmits the observation frequency domain data to the central station. The subspace orthogonality of the signal at each frequency point directly (jointly) estimates the position parameters of multiple targets in the signal data domain.

[0063] like figure 2 As shown in the figure, a method for cooperative direct positioning of multiple UAVs based on passive synthetic aperture includes the following steps:

[0064] Step 1: Do time synchronization for the M-channel array antenna receiving systems of L UAVs, and according to the Nyquist sampling theorem to T s The radio signal data radiated by Q targets is ...

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Abstract

The invention discloses a passive synthetic aperture-based multi-unmanned aerial vehicle cooperative direct positioning method. The method comprises the following steps of: establishing an array signal time domain model related to arrival signal complex envelope, carrier phase and Doppler frequency offset based on a plurality of unmanned aerial vehicle array receiving models; each unmanned aerial vehicle arranges array signal time domain data according to a time sequence to form an expanded array signal time domain model based on a passive synthetic aperture thought, and converts the expanded array signal time domain model into frequency domain data by using a radix-2-FFT algorithm; the central station forms frequency domain data into a multi-machine frequency domain observation vector, establishes a mathematical optimization model for joint estimation of a target position vector and a propagation coefficient according to a subspace orthogonal criterion, extracts an information matrix only containing a target position, and performs grid search of multiple regions by taking a minimum characteristic value of the minimum information matrix as a target; and accurate positioning of multiple targets is realized. According to the method, the multi-target positioning precision and the multi-target resolution capability can be remarkably improved, and the problem of data association in the multi-target positioning process can be avoided.

Description

technical field [0001] The invention belongs to the technical field of radio positioning, and in particular, for a multi-target positioning scenario based on multiple moving drones, a method for cooperative direct positioning of multiple drones based on passive synthetic aperture is proposed. Background technique [0002] As we all know, radio signal reconnaissance and positioning are of great significance for target discovery and situational awareness, among which space-based and space-based reconnaissance and positioning systems have played an irreplaceable benefit. With the unmanned development of avionics, unmanned reconnaissance aircraft will become an important supplement and enhancement means for reconnaissance satellites and manned reconnaissance aircraft. Compared with reconnaissance satellites, it has the characteristics of low cost and flexible reconnaissance area control; compared with manned reconnaissance aircraft, it has the ability to continue reconnaissance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02
CPCG01S5/0246
Inventor 尹洁昕王鼎陈灿李建阳杨宾陈田田李冰张莉郑娜娥赵华
Owner PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU
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