Double-base-station three-dimensional passive positioning method considering curvature of the earth

A passive positioning and earth curvature technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc. Effect

Active Publication Date: 2019-12-20
HANGZHOU DIANZI UNIV
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AI Technical Summary

Problems solved by technology

[0004] Some of the above methods do not consider the influence of the curvature of the earth on the three-dimensional tracking of the target

Method used

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  • Double-base-station three-dimensional passive positioning method considering curvature of the earth

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Embodiment Construction

[0017] Considering the influence of the curvature of the earth, the present invention proposes a dual-base station three-dimensional passive positioning method considering the curvature of the earth for the dual-base station external radiation source radar network. The initial position is obtained by establishing a likelihood function and then using probability data association (PDA) to predict and update to achieve accurate three-dimensional tracking of the target. Concrete flowchart of the present invention can refer to description accompanying drawing image 3 .

[0018] The method specifically includes the following steps:

[0019] Step 1: First establish the motion state of the target in the ECEF coordinate system, namely:

[0020]

[0021] where x t ,y t ,z t Respectively, the motion state of the target at the X, Y, and Z positions in the ECEF coordinate system, x 0 ,y 0 ,z 0 is the initial position of the target in the ECEF coordinate system, v is the speed o...

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Abstract

The invention discloses a double-base-station three-dimensional passive positioning method considering the curvature of the earth. The method comprises the following steps of firstly establishing a motion equation of a target and an external radiation source under an earth-centered earth-fixed coordinate system (ECEF) under the condition of considering the curvature of the earth, and then establishing a likelihood function according to measured double-base-station distance and angle information, solving an extreme value of the likelihood function through a genetic algorithm, and serving the extreme value as an initial motion state of the target. In addition, considering that the calculation time of the genetic algorithm is increased along with the increase of the data volume, the likelihood function is established by only selecting measurement values of the first fifteen moments in order to give consideration to requirements of real-time performance and accuracy; after the genetic algorithm obtains a target initial state by solving a solution of the likelihood function, the probability data association algorithm (PDA) is combined with the extended Kalman filter (EKF) to predict andupdate a target state at the later moment.

Description

technical field [0001] The invention belongs to the field of radar data processing, and in particular relates to a dual base station three-dimensional passive positioning method considering the curvature of the earth. Background technique [0002] The passive co-location system (PCL) uses a third-party signal transmitting station (FM radio, mobile phone base station, etc.) as the external radiation source / opportunistic radiation source, and performs signal coherent processing through the direct wave of the external radiation source and the echo reflected / scattered by the target , to achieve target passive positioning. The system has low cost, strong anti-interference ability, and good stealth / anti-stealth effect. It is an important means of air defense early warning and has important strategic significance for military defense and airspace security. For the schematic diagram of the dual base station system, please refer to the figure 1 , in the figure Tx represents the ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/66
CPCG01S13/66
Inventor 郭云飞袁继成薛安克彭冬亮左燕
Owner HANGZHOU DIANZI UNIV
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