Target radiation source positioning method based on TDOA

A positioning method and radiation source technology are applied in the field of radiation source positioning to achieve the effect of reducing the impact

Inactive Publication Date: 2020-05-08
HANGZHOU DIANZI UNIV
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Problems solved by technology

Use the gradient descent algorithm

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  • Target radiation source positioning method based on TDOA
  • Target radiation source positioning method based on TDOA
  • Target radiation source positioning method based on TDOA

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with drawings and embodiments.

[0019] Such as figure 1 As shown, the present invention proposes a TDOA-based target radiation source positioning method combined with a gradient descent algorithm for the positioning situation where non-line-of-sight errors may exist in the received time difference parameters, and the steps of the method are described in detail next .

[0020] Step 1: In a network of M sensors randomly distributed, obtain the time difference of arrival TDOA between the signal of the target radiation source arriving at the reference receiving station and arriving at multiple sensor receiving stations.

[0021] Time difference d between sensors i and j i,j Time difference of arrival d from sensor i to reference receiving station 1 i,1 and the arrival time difference d from sensor j to reference receiving station 1 j,1 The difference, expressed as:

[0022] d i,j = d i,1 -d j,1 i...

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Abstract

The invention discloses a target radiation source positioning method based on TDOA. According to the invention, a corresponding non-line-of-sight sensor vector is defined and the non-line-of-sight sensor vector is initialized according to received time difference parameters so as to correct original time difference parameters. And an intermediate variable is selected, a target radiation source TDOA pseudo-linear estimation model is constructed, and weighted least square estimation is applied to obtain position estimation of the target radiation source. And a result is corrected iteratively byusing a gradient descent algorithm. And finally, final target position estimation is provided by utilizing a relationship between the intermediate variable and a target position estimation coordinateand applying weighted least square estimation again. After introduction of a proper intermediate variable, a target radiation source TDOA measurement equation which is not easy to solve directly is converted into a pseudo-linear estimation model; meanwhile, a gradient descent algorithm is combined, so that the influence on the positioning performance due to possible non-line-of-sight errors is reduced. And finally, the final solution of the position coordinates is further optimized.

Description

technical field [0001] The invention relates to the technical field of radiation source positioning, in particular to a target radiation source positioning method based on time difference of arrival (TDOA). Background technique [0002] The location of the target source, in the country's military field, includes the positioning of radar, sonar, and navigation. We need to locate the enemy's target, so as to achieve the purpose of precisely striking enemy weapons and achieving military defense. In the field of our civilian life, including wireless communication, sensor network, Internet of Things, and various indoor and outdoor positioning, positioning services provide accurate services for our target objects, and they need to be used everywhere in this era of information communication. The positioning of the target source can be divided into active positioning of the target and passive positioning of the target according to whether the receiving station itself emits electroma...

Claims

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Application Information

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IPC IPC(8): G01S5/02G01S5/08
CPCG01S5/021G01S5/08
Inventor 颜成钢彭开来孙垚棋张继勇张勇东
Owner HANGZHOU DIANZI UNIV
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