Systems Engineering and Electronics ›› 2025, Vol. 47 ›› Issue (7): 2119-2126.doi: 10.12305/j.issn.1001-506X.2025.07.05

• Electronic Technology • Previous Articles    

Refraction correction of TDOA technique for over-the-horizon propagation mechanism

Qinglin ZHU1, Fang SUN1,*, Shanfeng YAO2, Xinxin OUYANG2, Hongguang WANG1, Jie HAN1, Xiang DONG1, Shoubao ZHANG1, Zhenwei ZHAO1   

  1. 1. China Research Institute of Radiowave Propagation, Qingdao 266107, China
    2. National Key Laboratory of Science and Technology on Blind Signal Processing, Chengdu 610041, China
  • Received:2024-05-13 Online:2025-07-16 Published:2025-07-22
  • Contact: Fang SUN

Abstract:

In response to the significant increase of atmospheric refraction error caused by two types of over-the-horizon propagation mechanisms: atmospheric duct and tropospheric scattering, which seriously affect the long-distance target positioning accuracy of the three station passive time difference positioning system, a refraction correction of time difference of arrival(TDOA) method for the over-the-horizon propagation mechanism is proposed. The method uses ray tracing technology to accurately calculate the ray trajectory parameters on the signal propagation path in the influence of atmospheric duct and tropospheric scattering environment, the measured time delay difference error from refraction is corrected with CHAN algorithm, and the geometric dilution accuracy calculation principle is used to evaluate the accuracy of the correction result. The evaluation results fully verify the effectiveness and accuracy of the correction technology and the method can significantly improve the positioning accuracy of over-the-horizon targets for the TDOA system.

Key words: time difference of arrival (TDOA), atmospheric duct, tropospheric scattering, refraction correction, ray tracing, geometric dilution of precision (GDOP)

CLC Number: 

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