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Flight trajectory prediction plays a crucial role in ensuring safe and efficient air traffic operation. In order to consider the implicit correlations between flight trajectory characteristics,the encoding and decoding operations of the prediction framework in the transformer model were enhanced. Firstly,the convolutional block was improved,and ordinary convolutions were applied to capture the correlations between neighboring time series trajectory characteristics,and dilated convolutions were added to capture correlations between non-neighboring time series trajectory characteristics. Secondly,multi-head self-attention was employed to perform calculation based on the spatiotemporal features of the flight trajectory combined with the importance of attention scores. Thirdly,probabilistic sparse method was designed to reduce the computational complexity of the multi-head self-attention and improve the model's computational efficiency. Finally,an experimental platform was established to verify the flight trajectory prediction framework. The results show that compared to the traditional transformer model and the other three neural network models,the improved transformer model shows a 14.4% improvement in time performance. By using root mean square error(RMSE) and mean absolute error(MAE) as evaluation metrics,the average prediction deviations of the improved transformer model for trajectory features such as longitude,latitude,and altitude are 0.027 and 0.021,respectively. These deviations are reduced by 0.072 and 0.063 compared to the traditional transformer model's average prediction deviations of 0.099 and 0.084. Sensitivity analysis on the lengths of prediction sequences indicates that the improved transformer model is more stable than the baseline models.
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针对现有的四维航迹预测未充分考虑序列航迹数据之间存在关联关系等问题,改进Transformer模型架构,完善四维航迹预测的编码和解码操作。首先,改进卷积模块,利用普通卷积捕捉相邻时序点的关联关系,通过扩张卷积捕捉邻近时序序列点之间的隐式相关性,从而覆盖更大的序列范围;其次,采用多头自注意力对航迹的时空间特征结合注意力分数的重要性进行调参计算,学习历史航迹数据的全局依赖关系;再次,通过引入概率稀疏方法,降低自注意力机制的计算复杂度,提高模型的计算效率;最后,搭建试验平台,预测对比航迹的经度、纬度和高度的时序特征。结果表明:改进Transformer模型与传统的Transformer模型等4种神经网络模型相比,时间性能提高14.4%;采用均方根误差(RMSE)和平均绝对误差(MAE)作为评价指标,改进Transformer模型对经度、纬度和高度等航迹特征预测的偏差的平均值分别为0.027和0.021;改进Transformer模型与传统Transformer模型的预测平均偏差0.099和0.084相比,分别减小0.072和0.063。对预测序列长度的敏感性分析得到,改进Transformer模型与基准模型相比,预测的稳定性更高。
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 |
刘 宏 (1985—),男,山西平遥人,博士,副教授,主要从事空中交通管理、智能交通优化、无人机空管安全运行等方面的研究。E-mail:mrliuhong@126.com。 |
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1 School of Air Traffic Management,Civil Aviation University of China,Tianjin 300300,China), AuthorCompanyExt(id=1167743080145887914, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, companyId=1167743080129110696, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1 中国民航大学 空中交通管理学院,天津 300300)]), AuthorCompany(id=1167743080200413867, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, xref=2, ext=[AuthorCompanyExt(id=1167743080204608172, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, companyId=1167743080200413867, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2 North Automatic Control Technology Institute,Taiyuan Shanxi 030006,China), AuthorCompanyExt(id=1167743080208802477, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, companyId=1167743080200413867, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2 北方自动控制技术研究所,山西 太原 030006)])], figs=[ArticleFig(id=1167743082209485520, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=EN, label=Fig.1, caption=
Framework of four-dimensional trajectory prediction system, figureFileSmall=kk9HlVgG+hK4ViaTGer1+g==, figureFileBig=pzO7wKbRE9SPE213lnB8rQ==, tableContent=null), ArticleFig(id=1167743082322731729, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=CN, label=图1, caption=
四维航迹预测系统框架, figureFileSmall=kk9HlVgG+hK4ViaTGer1+g==, figureFileBig=pzO7wKbRE9SPE213lnB8rQ==, tableContent=null), ArticleFig(id=1167743082423395026, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=EN, label=Fig.2, caption=
Schematic diagram of convolutional layer, figureFileSmall=gyEN0q32pGiYZa7qpth59g==, figureFileBig=SApTIpq+OxPFdtQBcmzFtg==, tableContent=null), ArticleFig(id=1167743082498892499, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=CN, label=图2, caption=
卷积层作用, figureFileSmall=gyEN0q32pGiYZa7qpth59g==, figureFileBig=SApTIpq+OxPFdtQBcmzFtg==, tableContent=null), ArticleFig(id=1167743082570195668, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=EN, label=Fig.3, caption=
Diagram of standard self-attention mechanism, figureFileSmall=9ZaJLbpxbAx0frh+YbMXdA==, figureFileBig=NT6MoOxM+xYVgZcS07CKcQ==, tableContent=null), ArticleFig(id=1167743082620527317, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=CN, label=图3, caption=
标准自注意力机制, figureFileSmall=9ZaJLbpxbAx0frh+YbMXdA==, figureFileBig=NT6MoOxM+xYVgZcS07CKcQ==, tableContent=null), ArticleFig(id=1167743082666664662, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=EN, label=Fig.4, caption=
Schematic diagram of multi-headed probability sparse self-attention, figureFileSmall=936EVxt4A6hrFCI5b81xbA==, figureFileBig=ubovkh4UFHDYmFDxlDeIYQ==, tableContent=null), ArticleFig(id=1167743082716996311, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=CN, label=图4, caption=
多头概率稀疏自注意力, figureFileSmall=936EVxt4A6hrFCI5b81xbA==, figureFileBig=ubovkh4UFHDYmFDxlDeIYQ==, tableContent=null), ArticleFig(id=1167743082779910872, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=EN, label=Fig.5, caption=
Masked data in decoder, figureFileSmall=diw0R/CnUoLW+8pZyeFJCg==, figureFileBig=FrvUSSV2z4x0DfD0xEcN+Q==, tableContent=null), ArticleFig(id=1167743082830242521, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=CN, label=图5, caption=
解码器中的数据掩码过程, figureFileSmall=diw0R/CnUoLW+8pZyeFJCg==, figureFileBig=FrvUSSV2z4x0DfD0xEcN+Q==, tableContent=null), ArticleFig(id=1167743082901545690, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=EN, label=Fig.6, caption=
3D-visualized latitude and longitude, figureFileSmall=VZHBsC3vb85Hmp4m9/Y76g==, figureFileBig=IUgx0PvS//X8ODsamZYx4w==, tableContent=null), ArticleFig(id=1167743082951877339, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=CN, label=图6, caption=
三维可视化, figureFileSmall=VZHBsC3vb85Hmp4m9/Y76g==, figureFileBig=IUgx0PvS//X8ODsamZYx4w==, tableContent=null), ArticleFig(id=1167743083027374812, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=EN, label=Fig.7, caption=
Visualization of predicted trajectories in three stages, figureFileSmall=gLM40UicMEiroGSJuN8/WQ==, figureFileBig=keq7tIFXuWHylhIoePRbNQ==, tableContent=null), ArticleFig(id=1167743083098677981, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=CN, label=图7, caption=
各飞行个阶段预测航迹可视化对比, figureFileSmall=gLM40UicMEiroGSJuN8/WQ==, figureFileBig=keq7tIFXuWHylhIoePRbNQ==, tableContent=null), ArticleFig(id=1167743083178369758, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=EN, label=Fig.8, caption=
Comparison diagram of various steps, figureFileSmall=N7orrjFjjFL9kelKlAxhgw==, figureFileBig=dmtgHUWD8ZnY9RNJkTgdbA==, tableContent=null), ArticleFig(id=1167743083253867231, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=CN, label=图8, caption=
不同步长对比, figureFileSmall=N7orrjFjjFL9kelKlAxhgw==, figureFileBig=dmtgHUWD8ZnY9RNJkTgdbA==, tableContent=null), ArticleFig(id=1167743083312587488, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=EN, label=Table 1, caption=
Preprocessing longitude
, figureFileSmall=null, figureFileBig=null, tableContent=
| 时间 | 原始数据 | 插值后 | 归一化后 |
| 2023-11-11 T7:51:08 | -118.409 8 | -118.409 8 | 0.005 203 874 |
| 2023-11-11 T7:51:13 | NA | -118.399 1 | 0.005 440 012 |
| 2023-11-11 T7:51:18 | NA | -118.407 | 0.005 265 667 |
| 2023-11-11 T7:51:23 | NA | -118.421 4 | 0.004 947 873 |
| 2023-11-11 T7:51:24 | -118.424 | NA | NA |
| 2023-11-11 T7:51:28 | NA | -118.431 3 | 0.004 729 39 |
| 2023-11-11 T7:51:33 | NA | -118.435 6 | 0.004 634 493 |
| 2023-11-11 T7:51:38 | NA | -118.437 5 | 0.004 592 562 |
| 2023-11-11 T7:51:40 | -118.4384 | NA | NA |
| 2023-11-11 T7:51:43 | NA | -118.440 3 | 0.004 530 769 |
| 2023-11-11 T7:51:48 | NA | -118.444 9 | 0.004 429 251 |
| 2023-11-11 T7:51:53 | NA | -118.450 6 | 0.004 303 458 |
| 2023-11-11 T7:51:56 | -118.454 1 | NA | NA |
| 2023-11-11 T7:51:58 | NA | -118.456 4 | 0.004 175 457 |
| 2023-11-11 T7:52:03 | NA | -118.462 1 | 0.004 049 664 |
| 2023-11-11 T7:52:08 | NA | -118.467 5 | 0.003 930 491 |
), ArticleFig(id=1167743083438416609, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=CN, label=表1, caption=
经度预处理
, figureFileSmall=null, figureFileBig=null, tableContent=
| 时间 | 原始数据 | 插值后 | 归一化后 |
| 2023-11-11 T7:51:08 | -118.409 8 | -118.409 8 | 0.005 203 874 |
| 2023-11-11 T7:51:13 | NA | -118.399 1 | 0.005 440 012 |
| 2023-11-11 T7:51:18 | NA | -118.407 | 0.005 265 667 |
| 2023-11-11 T7:51:23 | NA | -118.421 4 | 0.004 947 873 |
| 2023-11-11 T7:51:24 | -118.424 | NA | NA |
| 2023-11-11 T7:51:28 | NA | -118.431 3 | 0.004 729 39 |
| 2023-11-11 T7:51:33 | NA | -118.435 6 | 0.004 634 493 |
| 2023-11-11 T7:51:38 | NA | -118.437 5 | 0.004 592 562 |
| 2023-11-11 T7:51:40 | -118.4384 | NA | NA |
| 2023-11-11 T7:51:43 | NA | -118.440 3 | 0.004 530 769 |
| 2023-11-11 T7:51:48 | NA | -118.444 9 | 0.004 429 251 |
| 2023-11-11 T7:51:53 | NA | -118.450 6 | 0.004 303 458 |
| 2023-11-11 T7:51:56 | -118.454 1 | NA | NA |
| 2023-11-11 T7:51:58 | NA | -118.456 4 | 0.004 175 457 |
| 2023-11-11 T7:52:03 | NA | -118.462 1 | 0.004 049 664 |
| 2023-11-11 T7:52:08 | NA | -118.467 5 | 0.003 930 491 |
), ArticleFig(id=1167743083518108386, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=EN, label=Table 2, caption=
Model parameters
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| 参数 | 设置 |
| | 3 |
| l | 2 |
| d | 512 |
| 多头注意力的头数 | 8 |
| 训练周期 | 10 |
| 批量大小 | 128 |
| 优化器 | Adam |
| 学习率初值 | 0.001 |
| 激活函数 | GELU |
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模型参数
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| 参数 | 设置 |
| | 3 |
| l | 2 |
| d | 512 |
| 多头注意力的头数 | 8 |
| 训练周期 | 10 |
| 批量大小 | 128 |
| 优化器 | Adam |
| 学习率初值 | 0.001 |
| 激活函数 | GELU |
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Operating environment
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| 硬件环境 | 主频/GHz | 2.10 |
| 内存/G | 120 |
| 显存/GB | 24 |
| 软件环境 | 编程语言 | Python 3.8 |
| 基础框架 | PyTorch 2.0.0 |
), ArticleFig(id=1167743083706852069, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=CN, label=表3, caption=
运行环境
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| 硬件环境 | 主频/GHz | 2.10 |
| 内存/G | 120 |
| 显存/GB | 24 |
| 软件环境 | 编程语言 | Python 3.8 |
| 基础框架 | PyTorch 2.0.0 |
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Comparison of running speed
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| 组别 | 模型 | 每epoch (平均)时间/s | 整体时间/s |
| 第1组 | F1 | 15.28 | 152.814 |
| F | 13.08 | 130.886 |
| 第2组 | F1 | 35.73 | 357.36 |
| F | 30.16 | 301.68 |
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运行速度对比
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| 组别 | 模型 | 每epoch (平均)时间/s | 整体时间/s |
| 第1组 | F1 | 15.28 | 152.814 |
| F | 13.08 | 130.886 |
| 第2组 | F1 | 35.73 | 357.36 |
| F | 30.16 | 301.68 |
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Prediction data comparison with benchmark models
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| 模型 | MAE | RMSE |
| 纬度 | 经度 | 高度 | 平均 | 纬度 | 经度 | 高度 | 平均 |
| F1 | 0.044 | 0.092 | 0.116 | 0.084 | 0.05 | 0.113 | 0.136 | 0.099 |
| F2 | 0.028 | 0.032 | 0.047 | 0.035 | 0.035 | 0.041 | 0.055 | 0.043 3 |
| F3 | 0.034 | 0.058 | 0.062 | 0.047 | 0.042 | 0.075 | 0.077 | 0.0656 |
| F4 | 0.026 | 0.018 | 0.026 | 0.023 | 0.034 5 | 0.032 | 0.028 | 0.032 |
| F | 0.018 | 0.027 | 0.015 | 0.021 | 0.029 | 0.030 | 0.020 | 0.027 |
), ArticleFig(id=1167743083979481833, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=CN, label=表5, caption=
基准模型预测数据对比
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| 模型 | MAE | RMSE |
| 纬度 | 经度 | 高度 | 平均 | 纬度 | 经度 | 高度 | 平均 |
| F1 | 0.044 | 0.092 | 0.116 | 0.084 | 0.05 | 0.113 | 0.136 | 0.099 |
| F2 | 0.028 | 0.032 | 0.047 | 0.035 | 0.035 | 0.041 | 0.055 | 0.043 3 |
| F3 | 0.034 | 0.058 | 0.062 | 0.047 | 0.042 | 0.075 | 0.077 | 0.0656 |
| F4 | 0.026 | 0.018 | 0.026 | 0.023 | 0.034 5 | 0.032 | 0.028 | 0.032 |
| F | 0.018 | 0.027 | 0.015 | 0.021 | 0.029 | 0.030 | 0.020 | 0.027 |
), ArticleFig(id=1167743084046590698, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=EN, label=Table 6, caption=
Prediction data comparison with benchmark models in three stages(length of prediction series is 1)
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| 阶段 | 起始爬升阶段 | 巡航阶段 | 进近下降阶段 | |
| 模型 | 纬度 | 经度 | 高度 | 平均 | 纬度 | 经度 | 高度 | 平均 | 纬度 | 经度 | 高度 | 平均 |
| F1 | RMSE | 0.132 | 0.015 | 0.091 | 0.079 | 0.051 | 0.108 | 0.145 | 0.101 | 0.027 | 0.120 | 0.030 | 0.059 |
| MAE | 0.125 | 0.013 | 0.086 | 0.074 | 0.034 | 0.125 | 0.050 | 0.069 | 0.034 | 0.125 | 0.149 | 0.102 |
| F2 | RMSE | 0.146 | 0.031 | 0.119 | 0.098 | 0.078 | 0.155 | 0.097 | 0.33 | 0.015 | 0.116 | 0.11 | 0.08 |
| MAE | 0.128 | 0.026 | 0.114 | 0.089 | 0.155 | 0.096 | 0.038 | 0.096 | 0.013 | 0.113 | 0.108 | 0.078 |
| F3 | RMSE | 0.014 | 0.045 | 0.118 | 0.059 | 0.066 | 0.072 | 0.052 | 0.063 | 0.040 | 0.048 | 0.045 | 0.044 |
| MAE | 0.012 | 0.030 | 0.100 | 0.047 | 0.038 | 0.065 | 0.064 | 0.055 | 0.038 | 0.038 | 0.037 | 0.038 |
| F4 | RMSE | 0.029 | 0.005 | 0.031 | 0.022 | 0.029 | 0.024 | 0.030 | 0.028 | 0.072 | 0.06 | 0.027 | 0.053 |
| MAE | 0.027 | 0.010 | 0.029 | 0.022 | 0.022 | 0.015 | 0.030 | 0.027 | 0.071 | 0.059 | 0.026 | 0.052 |
| F | RMSE | 0.071 | 0.014 | 0.024 | 0.036 | 0.020 | 0.038 | 0.021 | 0.026 | 0.016 | 0.060 | 0.019 | 0.031 |
| MAE | 0.055 | 0.01 | 0.019 | 0.028 | 0.015 | 0.029 | 0.018 | 0.020 | 0.018 | 0.048 | 0.010 | 0.025 |
), ArticleFig(id=1167743084130476779, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=CN, label=表6, caption=
不同阶段基准模型预测数据对比(预测序列长度为1)
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| 阶段 | 起始爬升阶段 | 巡航阶段 | 进近下降阶段 | |
| 模型 | 纬度 | 经度 | 高度 | 平均 | 纬度 | 经度 | 高度 | 平均 | 纬度 | 经度 | 高度 | 平均 |
| F1 | RMSE | 0.132 | 0.015 | 0.091 | 0.079 | 0.051 | 0.108 | 0.145 | 0.101 | 0.027 | 0.120 | 0.030 | 0.059 |
| MAE | 0.125 | 0.013 | 0.086 | 0.074 | 0.034 | 0.125 | 0.050 | 0.069 | 0.034 | 0.125 | 0.149 | 0.102 |
| F2 | RMSE | 0.146 | 0.031 | 0.119 | 0.098 | 0.078 | 0.155 | 0.097 | 0.33 | 0.015 | 0.116 | 0.11 | 0.08 |
| MAE | 0.128 | 0.026 | 0.114 | 0.089 | 0.155 | 0.096 | 0.038 | 0.096 | 0.013 | 0.113 | 0.108 | 0.078 |
| F3 | RMSE | 0.014 | 0.045 | 0.118 | 0.059 | 0.066 | 0.072 | 0.052 | 0.063 | 0.040 | 0.048 | 0.045 | 0.044 |
| MAE | 0.012 | 0.030 | 0.100 | 0.047 | 0.038 | 0.065 | 0.064 | 0.055 | 0.038 | 0.038 | 0.037 | 0.038 |
| F4 | RMSE | 0.029 | 0.005 | 0.031 | 0.022 | 0.029 | 0.024 | 0.030 | 0.028 | 0.072 | 0.06 | 0.027 | 0.053 |
| MAE | 0.027 | 0.010 | 0.029 | 0.022 | 0.022 | 0.015 | 0.030 | 0.027 | 0.071 | 0.059 | 0.026 | 0.052 |
| F | RMSE | 0.071 | 0.014 | 0.024 | 0.036 | 0.020 | 0.038 | 0.021 | 0.026 | 0.016 | 0.060 | 0.019 | 0.031 |
| MAE | 0.055 | 0.01 | 0.019 | 0.028 | 0.015 | 0.029 | 0.018 | 0.020 | 0.018 | 0.048 | 0.010 | 0.025 |
), ArticleFig(id=1167743084193391340, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1149733274077016699, language=EN, label=Table 7, caption=
Deviation difference with benchmark models under various steps("-" indicates increase)
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| 模型 | 1 | 16 | 32 | 48 | 64 | 80 | 96 |
| F2 | 0.159 3 | 0.041 6 | 0.006 1 | 0.040 4 | -0.005 | 0.005 9 | 0.01 |
| F3 | 0.067 6 | 0.934 1 | 0.916 7 | 0.974 4 | 0.943 5 | 0.963 3 | 0.949 9 |
| F4 | 0.008 3 | 0.922 2 | 0.899 0 | 0.946 9 | 0.911 1 | 0.93 | 1.792 5 |
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不同步长预测航迹特征的总体偏差变化(“-”为增大)
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| 模型 | 1 | 16 | 32 | 48 | 64 | 80 | 96 |
| F2 | 0.159 3 | 0.041 6 | 0.006 1 | 0.040 4 | -0.005 | 0.005 9 | 0.01 |
| F3 | 0.067 6 | 0.934 1 | 0.916 7 | 0.974 4 | 0.943 5 | 0.963 3 | 0.949 9 |
| F4 | 0.008 3 | 0.922 2 | 0.899 0 | 0.946 9 | 0.911 1 | 0.93 | 1.792 5 |
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