Long-term autonomous time-keeping of navigation constellations based on sparse sampling LSTM algorithm

IF 9 1区 地球科学 Q1 ENGINEERING, AEROSPACE
Shitao Yang, Xiao Yi, Richang Dong, Yifan Wu, Tao Shuai, Jun Zhang, Qianyi Ren, Wenbin Gong
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引用次数: 0

Abstract

The system time of the four major navigation satellite systems is mainly maintained by multiple high-performance atomic clocks at ground stations. This operational mode relies heavily on the support of ground stations. To enhance the high-precision autonomous timing capability of next-generation navigation satellites, it is necessary to autonomously generate a comprehensive space-based time scale on orbit and make long-term, high-precision predictions for the clock error of this time scale. In order to solve these two problems, this paper proposed a two-level satellite timing system, and used multiple time-keeping node satellites to generate a more stable space-based time scale. Then this paper used the sparse sampling Long Short-Term Memory (LSTM) algorithm to improve the accuracy of clock error long-term prediction on space-based time scale. After simulation, at sampling times of 300 s, 8.64 × 104 s, and 1 × 106 s, the frequency stabilities of the spaceborne timescale reach 1.35 × 10–15, 3.37 × 10–16, and 2.81 × 10–16, respectively. When applying the improved clock error prediction algorithm, the ten-day prediction error is 3.16 × 10–10 s. Compared with those of the continuous sampling LSTM, Kalman filter, polynomial and quadratic polynomial models, the corresponding prediction accuracies are 1.72, 1.56, 1.83 and 1.36 times greater, respectively.
基于稀疏采样 LSTM 算法的导航星座长期自主计时
四大导航卫星系统的系统时间主要由地面站的多个高性能原子钟维持。这种运行模式严重依赖地面站的支持。为了提高下一代导航卫星的高精度自主授时能力,有必要自主生成一个全面的天基在轨时间尺度,并对该时间尺度的时钟误差进行长期、高精度的预测。为了解决这两个问题,本文提出了两级卫星授时系统,利用多颗授时节点卫星生成更稳定的天基时标。然后,本文采用稀疏采样长短期记忆(LSTM)算法来提高天基时标时钟误差长期预测的精度。经过仿真,在采样时间为 300 s、8.64 × 104 s 和 1 × 106 s 时,天基时标频率稳定度分别达到 1.35 × 10-15、3.37 × 10-16 和 2.81 × 10-16。与连续采样 LSTM、卡尔曼滤波、多项式和二次多项式模型相比,相应的预测精度分别提高了 1.72、1.56、1.83 和 1.36 倍。
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来源期刊
CiteScore
19.40
自引率
6.20%
发文量
25
审稿时长
12 weeks
期刊介绍: Satellite Navigation is dedicated to presenting innovative ideas, new findings, and advancements in the theoretical techniques and applications of satellite navigation. The journal actively invites original articles, reviews, and commentaries to contribute to the exploration and dissemination of knowledge in this field.
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