JAXA Supercomputer System Annual Report April 2018-March 2019

Report Number: R18ER0800

Subject Category: Space Technology

PDF available here

• Responsible Representative: Koichi Inoue, Space Technology Directorate I, Satellite Navigation Unit
• Contact Information: Hiroshi Takiguchi(takiguchi.hiroshi@jaxa.jp)
• Members: Hiroshi Takiguchi, Sho Miyoshi

Abstract

Satellite Navigation Unit has been generating the precise orbit and clock products of GNSS satellites by using MADOCA (Multi-GNSS Advanced Demonstration tool for Orbit and Clock Analysis), and been distributing to user via network routinely. On the JSS2, we aim to realize fast computation for the long-term data analysis and simulation.

Reference URL

Please refer to 'MADOCA Products'.

Reasons for using JSS2

To improve the MADOCA products accuracy, we need to do long-term data analysis. By using JSS2, we have been expecting the reduction of the data analysis time.

Achievements of the Year

We validated the orbit and clock determination products which generated by using MADOCA on the general-purpose PC routinely. By using the computing ability of JSS2, we could performed multiple processing with different settings and/or the analysis of long-term data in a short time. Especially, we confirmed that we could generate the Ultra-Rapid product in the permissible accuracy every single hour which usually generated every six hours on the general-purpose PC (Figure 1).

We also adjusted the data communication environment between JSS2 and our general-purpose PC, together with Supercomputer Division. That communication environment is necessary to perform the improvement of MADOCA on JSS2 and we confirmed it. By this adjustment, we obtained the ability of gathering the real-time data from the global GNSS stations and generating the real-time products on JSS2.

Fig.1: The evaluation results of the predicted part in the Ultra-Rapid products which generated every single hour with reference to the IGS Rapid products. From the top, Radial, Along and Cross components.

Publications

N/A

Usage of JSS2

Computational Information

• Process Parallelization Methods: N/A
• Thread Parallelization Methods: OpenMP
• Number of Processes: 1
• Elapsed Time per Case: 30 Minute(s)

Resources Used

Fraction of Usage in Total Resources*1(%): 0.06

Details

Please refer to System Configuration of JSS2 for the system configuration and major specifications of JSS2.

*1: Fraction of Usage in Total Resources: Weighted average of three resource types (Computing, File System, and Archiver).

*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.

JAXA Supercomputer System Annual Report April 2018-March 2019