Target positioning method based on 3D ray-tracing algorithm

A three-dimensional ray and tracking algorithm technology, applied in the direction of using re-radiation, radio wave measurement system, radio wave reflection/re-radiation, etc., can solve the problem of low availability of parameters, difficult to calculate parameters, and accurate calculation. It can improve the reliability and accuracy of problems such as reliability and the fact that it is not in line with the actual situation.

Active Publication Date: 2012-07-04
BEIHANG UNIV
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Problems solved by technology

In addition, the use of two-dimensional display and calculation method, the availability of the calculated parameters is not high (such as the angle of arrival of rays, etc.)
Therefore, the existing technology is not high in calculation accuracy and in line with the actual situation, and it is difficult to further apply the calculated parameters.

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  • Target positioning method based on 3D ray-tracing algorithm
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Embodiment Construction

[0028] See figure 1 , the present invention is a kind of target localization method based on three-dimensional ray tracing algorithm, and the concrete steps of this method are as follows:

[0029] Step 1: Construct the ionospheric electron concentration distribution according to the International Reference Ionosphere (IRI) model.

[0030] The ionospheric electron concentration value predicted by the IRI model changes with time, geographic location and altitude. When using it, you need to input the predicted time, and the predicted geographic location and altitude value will get the electron concentration value at the corresponding height. It can also refer to the input prediction. Time and Geographical Location Obtain the change of electron concentration over the geographical location with altitude. If the geographical location is selected in Beijing (39.9°N, 116.3°E), and the predicted time is 12:00 noon on August 1, 2011, then it can The distribution of ionospheric electron...

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Abstract

A target positioning method based on the 3D ray-tracing algorithm includes six steps: firstly, building an ionosphere electron concentration distribution as per an international reference ionosphere model; secondly, confirming space distribution of refraction indexes; thirdly, setting parameters of the 3D ray-tracing algorithm as per radar receiving signal parameters; fourthly, performing 3D ray-tracing calculation as per the setting in step 3, so as to obtain the relationship between the ray group path value and the geographical position; fifthly, processing the data obtained from step 4, so as to obtain the corresponding relation between the time delay and the geographical position; and sixthly, comparing the time delay of a receiving signal with the time delay obtained in the step 5 through calculation, so as to obtain the geographical position corresponding to the time delay of the receiving signal, and further obtain the position of the target. The method adopts the international reference ionosphere (IRI) model to build the propagation environment, simulates the electric wave propagation through adopting the 3D ray-tracing technology, can obtain the data more in conformity with the actual condition, and can be used for guiding the application of short wave detection.

Description

(1) Technical field [0001] The invention relates to a target positioning method based on a three-dimensional ray tracing algorithm, which belongs to the technical field of short-wave detection. (2) Background technology [0002] In the application of short-wave detection, due to the influence of random changes in ionospheric electron density distribution, the reflection height and trajectory of radio waves also change accordingly, so there is no effective algorithm in target positioning at present. [0003] Using ray tracing technology to calculate the target position, as long as the model used can be as close to reality as possible, it can match the actual situation to a relatively accurate degree. Ray tracing technology refers to the approximation of electromagnetic waves as rays in the case of high frequency, and the calculation of electromagnetic wave trajectories according to the environmental conditions where the rays propagate. Therefore, using this technique, all ra...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/06G01S13/48
Inventor 阎照文王刚曹晋于文璐
Owner BEIHANG UNIV
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