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Multi-radiation source direct positioning method based on single unmanned aerial vehicle

A multi-radiation source and positioning method technology, applied in the field of multi-radiation source direct positioning, can solve the problems of limited positioning accuracy and resolution ability, and achieve the effect of facilitating engineering implementation and improving positioning accuracy

Pending Publication Date: 2022-04-19
ARMY ENG UNIV OF PLA
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of limited positioning accuracy and resolution ability in the traditional two-step positioning method, the present invention proposes a direct positioning method based on a single UAV with multiple radiation sources, using the method of space-time-frequency signal subspace fitting, which can effectively solve the problem of In the direct positioning of multiple radiation sources, it only relies on the limitation of airspace information to achieve simultaneous positioning of multiple targets

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  • Multi-radiation source direct positioning method based on single unmanned aerial vehicle
  • Multi-radiation source direct positioning method based on single unmanned aerial vehicle
  • Multi-radiation source direct positioning method based on single unmanned aerial vehicle

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Embodiment

[0091] Example: Setting area S=3500×5000m 2 There is an unmanned aerial vehicle equipped with a uniform linear array of M=5 elements, and there are Q=2 radiation sources in the far-field area of ​​the array. This drone starts from position [-1500, 3000] T (m) starting from west to east with v=[200, 0] T (m / s) moving at a uniform speed, reaching position [900, 3000] after K = 9 sensing time slots T (m). The two radiation sources are located at p 1 =[-1200, 0] T (m) and p 2 =[1000, 0] T (m), transmit center frequency f c =200(MHz), the initial phase is narrowband signal. In addition, other parameters are set as follows: c 1 =c 2 = 1.49445, w = 0.8, N g =40, N p =10, H=100, L=10, N c =1600, ε=1×e -5 , D=1000.

[0092] image 3 and Figure 4 are the root mean square error of positioning and the average relative error of positioning of each algorithm, respectively, which are named as two-step positioning, OWSSF, SF-OWSSF, STF-PSO-AP, and STF-RNN. Let the signal-...

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Abstract

The invention discloses a multi-radiation-source direct positioning method based on a single unmanned aerial vehicle, and the method comprises the steps: enabling the unmanned aerial vehicle to receive a plurality of radiation source signals in K sensing time slots along a certain flight path, and outputting an array response snapshot vector; performing space-time frequency expansion on the array response snapshot vector in each sensing time slot; calculating a covariance matrix of a space-time frequency array response snapshot vector in each sensing time slot, and extracting a signal subspace and a corresponding characteristic value thereof; introducing a target function by using a weighted signal subspace fitting thought; and designing an algorithm to find out a space coordinate position corresponding to the maximum objective function value, namely position estimation of the plurality of radiation sources. On the premise of keeping good positioning performance, the limitation that multiple radiation sources only depend on airspace information in direct positioning can be effectively eliminated, and simultaneous positioning of multiple targets is achieved by using a space-time frequency signal subspace fitting method; only one unmanned aerial vehicle carrying a small-sized uniform linear array is needed to complete the operation, the required data is small, the operation cost is low, and engineering realization is facilitated.

Description

technical field [0001] The invention belongs to the passive positioning field of wireless communication technology, in particular to a method for direct positioning of multiple radiation sources based on a single unmanned aerial vehicle. Background technique [0002] Location information provides a basic reference for applications such as navigation, communication, spectrum hole mining, resource selection and allocation. Space-based platforms based on satellite navigation systems such as GPS and Beidou can monitor and locate radiation sources through a wide coverage area. However, due to weak satellite signals in urban or indoor environments, space-based platform positioning errors tend to be large in such environments. Ground-based platforms based on active equipment such as radar, lidar, and sonar use high-power signals to locate radiation sources. However, traditional land-based platforms are vulnerable to malicious interference from other electronic devices when workin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/06
CPCG01S5/06
Inventor 丁国如李康焦雨涛徐以涛李京华
Owner ARMY ENG UNIV OF PLA
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