A 3D Passive Positioning Method with Dual Base Stations Considering the Earth's Curvature

A passive positioning and earth curvature technology, applied in radio wave measurement system, radio wave reflection/re-radiation, instruments, etc., can solve the problem of not considering the influence of three-dimensional tracking of the earth curvature target

Active Publication Date: 2021-10-22
HANGZHOU DIANZI UNIV
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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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  • A 3D Passive Positioning Method with Dual Base Stations Considering the Earth's Curvature
  • A 3D Passive Positioning Method with Dual Base Stations Considering the Earth's Curvature
  • A 3D Passive Positioning Method with Dual Base Stations Considering the Earth's Curvature

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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 the 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 ECEF, 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 of the target movem...

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Abstract

The invention discloses a dual base station three-dimensional passive positioning method considering the curvature of the earth. The present invention first establishes the motion equation of the target and the external radiation source in the earth-centered earth-fixed coordinate system (ECEF) under the consideration of the curvature of the earth, and then establishes a likelihood function according to the measured distance and angle information of the dual base stations, through genetic The algorithm solves the extreme value of the likelihood function and takes it as the initial motion state of the target. In addition, considering that the calculation time of the genetic algorithm increases with the increase of the amount of data, in order to take into account the requirements of real-time and accuracy, the present invention only selects the measured values ​​of the first fifteen moments to establish the likelihood function, and calculates the likelihood function in the genetic algorithm. After the initial state of the target is obtained from the solution of the likelihood function, the probabilistic data association algorithm (PDA) combined with the extended Kalman filter (EKF) is used to predict and update the target state.

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 Patents(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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