地球信息科学学报 ›› 2019, Vol. 21 ›› Issue (11): 1689-1698.doi: 10.12082/dqxxkx.2019.190263
收稿日期:
2019-05-30
修回日期:
2019-08-16
出版日期:
2019-10-25
发布日期:
2019-12-11
通讯作者:
卢万杰
E-mail:lwj285149763@163.com
作者简介:
卢万杰(1991-),男,河南焦作人,博士生,主要从事空间目标态势分析与服务研究。 E-mail: lwj285149763@163.com
基金资助:
LU Wanjie*(), XU Qing, LAN Chaozhen, ZHOU Yang
Received:
2019-05-30
Revised:
2019-08-16
Online:
2019-10-25
Published:
2019-12-11
Contact:
LU Wanjie
E-mail:lwj285149763@163.com
Supported by:
摘要:
卫星对地覆盖时间窗口的高效计算能够有效地保障遥感卫星数据信息资源的管理与应用。为解决现有卫星对地覆盖时间窗口计算方法无法提供同时保证精度、效率和实时性的在线服务的问题,提出了一种实时卫星对地覆盖时间窗口计算服务方法。在时间窗口的通用计算方法基础上,建立了地面区域的扩充四至范围,通过判断卫星星下点与地面区域的扩充四至范围的空间关系来决定是否需要计算卫星对地覆盖区域;在卫星对地覆盖区域与地面区域空间关系发生变化时,通过双重时间步长策略提高计算效率和精度;使用流计算框架构建算法的实时在线服务。实验结果表明,与商业软件采用的跟踪传播算法对比,本文方法与其计算结果差异较小,均小于1 s,说明本文方法能够保证较高的计算精度;与传统跟踪传播算法相比,本文方法耗时大幅减少,实现了超过8倍的加速比。本文方法同时保证了精度、效率和实时性,能够满足不同场景下卫星对地覆盖时间窗口的计算需求。
卢万杰, 徐青, 蓝朝桢, 周杨. 卫星对地覆盖时间窗口实时计算方法[J]. 地球信息科学学报, 2019, 21(11): 1689-1698.DOI:10.12082/dqxxkx.2019.190263
LU Wanjie, XU Qing, LAN Chaozhen, ZHOU Yang. A Real-Time Calculation Method for Satellite Ground Coverage Time Window[J]. Journal of Geo-information Science, 2019, 21(11): 1689-1698.DOI:10.12082/dqxxkx.2019.190263
表1
卫星对地覆盖区域时间窗口计算实验数据"
类别 | 参数 |
---|---|
TLE[ | |
起止时间 | 2018-07-01 00:00:00~2018-07-11 00:00:00 |
时间步长 | |
矩形模型[ | |
区域1(E, N) | (89.36° E, 31.30° N), (89.21° E, 27.35° N), (95.52° E, 27.15° N), (95.57° E, 30.96° N) |
区域2(W, N) | (110.60° W, 43.32° N), (104.75° W, 42.83° N), (104.15° W, 45.85° N), (104.45° W, 49.13° N), (109.68° W, 50.54° N), (110.18° W, 46.94° N) |
表2
卫星对地覆盖区域时间窗口计算结果对比"
区域 编号 | 窗口 编号 | 本文算法起始时刻 (UTC时间) | 本文算法终止时刻 (UTC时间) | STK预报起始时刻 (UTC时间) | STK预报终止时刻 (UTC时间) |
---|---|---|---|---|---|
区域1 | 1 | 2018-07-02T04:32:37.85 | 2018-07-02T04:33:43.06 | 2018-07-02T04:32:37.48 | 2018-07-02T04:33:43.06 |
2 | 2018-07-03T04:13:27.40 | 2018-07-03T04:14:30.61 | 2018-07-03T04:13:27.49 | 2018-07-03T04:14:30.34 | |
3 | 2018-07-04T16:00:01.65 | 2018-07-04T16:01:08.64 | 2018-07-04T16:00:01.95 | 2018-07-04T16:01:08.53 | |
4 | 2018-07-05T15:40:44.48 | 2018-07-05T15:41:49.93 | 2018-07-05T15:40:44.37 | 2018-07-05T15:41:50.25 | |
5 | 2018-07-07T04:31:06.46 | 2018-07-07T04:32:11.51 | 2018-07-07T04:31:06.04 | 2018-07-07T04:32:11.38 | |
6 | 2018-07-08T04:11:57.58 | 2018-07-08T04:12:58.69 | 2018-07-08T04:11:57.65 | 2018-07-08T04:12:58.53 | |
7 | 2018-07-09T15:58:29.07 | 2018-07-09T15:59:36.37 | 2018-07-09T15:58:29.43 | 2018-07-09T15:59:36.35 | |
8 | 2018-07-10T15:39:12.61 | 2018-07-10T15:40:16.78 | 2018-07-10T15:39:12.50 | 2018-07-10T15:40:17.00 | |
区域2 | 1 | 2018-07-04T05:01:11.99 | 2018-07-04T05:02:56.78 | 2018-07-04T05:01:12.51 | 2018-07-04T05:02:56.93 |
2 | 2018-07-04T18:01:37.08 | 2018-07-04T18:03:27.05 | 2018-07-04T18:01:36.58 | 2018-07-04T18:03:26.84 | |
3 | 2018-07-05T04:42:34.29 | 2018-07-05T04:43:44.11 | 2018-07-05T04:42:34.34 | 2018-07-05T04:43:44.55 | |
4 | 2018-07-05T17:43:28.43 | 2018-07-05T17:44:18.35 | 2018-07-05T17:43:28.51 | 2018-07-05T17:44:18.29 | |
5 | 2018-07-09T04:59:39.16 | 2018-07-09T05:01:37.93 | 2018-07-09T04:59:39.66 | 2018-07-09T05:01:37.90 | |
6 | 2018-07-09T18:00:06.08 | 2018-07-09T18:01:54.90 | 2018-07-09T18:00:05.57 | 2018-07-09T18:01:54.59 | |
7 | 2018-07-10T04:41:19.07 | 2018-07-10T04:42:09.37 | 2018-07-10T04:41:18.84 | 2018-07-10T04:42:09.65 |
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