Improved Adaptive Hatch Filter Algorithm Based on Code-carrier Divergence

被引：0
|
作者：
Hu J. [1 ,2 ]
Zhang L. [1 ,2 ]
Zhu Y. [3 ]
Zhou L. [4 ]
机构：
[1] The 28th Research Institute, China Electronics Technology Group Corporation, Nanjing
[2] State Key Laboratory of Air Traffic Management System and Technology, Nanjing
[3] School of Mechanical Engineering, Nantong University, Nantong
[4] Department of Physics and Electronic Engineering, Yuncheng University, Yuncheng
来源：
Binggong Xuebao/Acta Armamentarii | 2021年 / 42卷 / 03期
关键词：
Code-carrier divergence; Ground-based augmentation system; Hatch filter; Ionospheric delay; Pseudorange measurement noise;
D O I：
10.3969/j.issn.1000-1093.2021.03.011
中图分类号：
学科分类号：
摘要：
The smoothing accuracy of carrier-phase smoothing pseudorange in single-frequency ground-based augmentation system (GBAS) is easily affected by the ionospheric delay and pseudorange measurement noises. The influence of code-carrier divergence of satellite signal on the smoothing accuracy of Hatch filter is analyzed, and an improved adaptive Hatch filter algorithm based on code-carrier divergence is proposed. The code-minus-carrier is computed using pseudorange and carrier-phase measurements, and its first-order linear model is established. The ionospheric delay rate is estimated by using the least square method. Given the estimated ionospheric delay rate, the pseudorange measurement noise can be separated. A function model between the root mean square of smoothed pseudorange and the ionospheric delay rate, the standard deviation of pseudorange measurement noise and the smoothing time of Hatch filter is established, from which the optimal smoothing time of Hatch filter can be calculated. The verification experiments were carried out by using GBAS prototype. The experimental results show that the adaptive Hatch filter is able to calculate the optimal smoothing time of filter based on the real-time ionospheric delay rate and the standard deviation of pseudorange measurement noise. Compared with the traditional fixed smoothing time algorithm, the maximum position accuracy of airborne differential positioning is improved by 53.19 percent by using the adaptive Hatch filter algorithm, which verifies the effectiveness of the proposed algorithm. © 2021, Editorial Board of Acta Armamentarii. All right reserved.
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页码：555 / 562
页数：7
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