| 大气波导对无源定位差分时延精度的影响 |
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| 引用本文： | 董翔,慈颖,盛午刚,孙方,朱庆林.大气波导对无源定位差分时延精度的影响[J].电波科学学报,2020,35(6):847-855. |
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| 作者姓名： | 董翔 慈颖 盛午刚 孙方 朱庆林 |
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| 作者单位： | 1.武汉大学电子信息学院, 武汉 430000 |
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| 基金项目： | 国家自然科学基金61901424 |
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| 摘 要： | 利用泰勒级数近似的射线追踪算法，针对1 000 km范围内的超视距目标时差定位系统进行传播路径仿真建模，计算分析了不同波导环境下的差分时延误差和多径相对时延，评估了时差定位系统对大气波导超视距目标的时延差精度.计算结果表明，由于大气折射环境随距离的变化，无源定位系统的差分时延误差会随着通信距离的增大而增大.当系统通信距离达到近1 000 km时，较强的表面波导环境可使差分时延误差达到近30 ns，多径相对时延可达近20 ns；蒸发波导可使时延误差达近40 ns，多径相对时延同样可达近20 ns.通过对实际波导环境超视距链路时延效应的定量分析，为无源时差定位系统的工作性能和参数设计提供了环境保障和技术支撑.
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| 关 键 词： | 大气波导 差分时延 无源定位 多径时延 超视距 |
| 收稿时间： | 2020-09-14 |
Impact of atmospheric duct on time difference precision of passive location system |
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| Affiliation: | 1.School of Electronic Information, Wuhan University, Wuhan 430000, China2.China Research Institute of Radiowave Propagation, Qingdao 266107, China3.Beijing Institute of Tracking and Communication Technology, Beijing 100000, China4.Xichang Satellite Launch Center, Xichang 615000, China |
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| Abstract: | Based on the ray tracing algorithm of Taylor series approximation, the propagation path simulation model of over-the-horizon target time difference of arrival (TDOA) location system within 1 000 km is carried out. The differential time delay error and multipath relative delay under different atmospheric duct environments are calculated and analyzed, and the delay difference accuracy of TDOA positioning system aimed to over the horizon target is evaluated. The results show that the differential time delay error of passive location system increases with the increase of communication distance due to the variation of atmospheric refraction environment with distance. When the communication distance of the system is close to 1 000 km, the differential time delay error can reach nearly 30 ns and the relative multi-path delay can reach nearly 20 ns under the strong surface duct environment, while the time delay difference at 1 000 km communication distance can reach nearly 40 ns and the relative multi-path delay can also reach nearly 20 ns under evaporation duct. Through the quantitative analysis of the time delay of the over-the-horizon link caused by atmospheric duct, the environmental protection and technical support is provided for the performance and parameter design of the passive TDOA location system. |
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