基于经验电离层模型的短波时差定位理论分析

doi:10.12305/j.issn.1001-506X.2023.07.01

Abstract

Abstract:

For shortwave, the signal from the radiation source to the receiving station has to be reflected by the ionosphere, so the shortwave time difference of arrival (TDOA) geolocation model includes ionospheric information. The ionosphere is equivalent to a uniform distribution model in traditional shortwave TDOA positioning, and the disturbance of ionospheric information has a great impact on the positioning accuracy. In this paper, the electron density information of the ionosphere is obtained by using the international reference ionosphere (IRI) model, the shortwave TDOA geolocation equation is established by using the numerical three-dimensional ray tracing method, and the Cramer-Rao lower bound (CRLB) of shortwave TDOA geolocation is derived. The simulation results show that the CRLB for shortwave TDOA geolocation is better during the day than at night, and there is no significant difference between high solar activity years and low solar activity years. Under the conditions of accurate acquisition of ionospheric information, variations of the ionosphere does not have a significant impact on the CRLB of shortwave TDOA geolocation.

Key words: international reference ionospheric (IRI) model, numerical three-dimensional ray tracing, shortwave time difference of arrival (TDOA) geolocation, Cramer-Rao lower bound (CRLB)

CLC Number:

TN011

Chen LI, Chen ZHOU, Junming WANG, Mingjie LYU, Wei QIAO. Theoretical analysis of shortwave TDOA geolocation based on empirical ionospheric model[J]. Systems Engineering and Electronics, 2023, 45(7): 1911-1919.

Figures/Tables 5

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References 40

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电离层背景	电离层反射高度/km						总样本数
电离层背景	220~240	240~260	260~280	280~300	300~320	320~340	总样本数
太阳高年白天	3 966	8	0	17	41	0	4 032
太阳高年夜晚	128	9	0	318	1 523	1 046	3 024
太阳低年白天	3 946	6	1	53	26	0	4 032
太阳低年夜晚	108	10	0	146	973	1 446	2 683

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Theoretical analysis of shortwave TDOA geolocation based on empirical ionospheric model

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