Small synthetic aperture radar satellite

JAXA Supercomputer System Annual Report April 2017-March 2018

Report Number: R17ECMP07

Subject Category: Competitive Funding

Responsible Representative: Takahiro Yamada, Institute of Space and Astronautical Science, Division of Spacecraft Engineering
Contact Information: Tomoya Fukami fukami.tomoya@ac.jaxa.jp
Members: Tomoya Fukami, Hirobumi Saito, Kengo Ando, Pyne Budhaditya, Prilando Rizki Akbar

Abstract

We are goint to develop synthetic aperture radar system that can be onboard on a 100kg class satellite and to verify it on ground. Conventionally radar observations have required large or medium satellite with 500-1000kg mass. Our research and development may change earth observation drastically.

Reference URL

Please refer to ‘Impulsing Paradigm Change through Disruptive Technologies Program ImPACT: R&D Programs‘.

Reasons for using JSS2

We utilize super-computer for design of slot array antennas dedicated for small synthetic aperture radar. Design of slot array antenna requires a super-computer that is provided with high speed and large memory.

Achievements of the Year

We performed simulation for 4 panels antenna and antenna network feeder system for antenna panels array. Here the, we simplified the simulation of network feeder system for 7 antenna panels array with 3.5 antenna panels array simulation. The simulation results are shown in Fig.1. In this simulation, in-phase and uniform excitation to the parallel-plate antenna are expected. Furthermore, the simulation results which are showing performance of each antenna panels is shown in Fig.2.

Fig.1: Tournament feeder network design for 7 antenna panels array.

Fig.2: Antenna Panels simulation results.

Publications

■ Peer-reviewed papers

1) B. Pyne, P.R. Akbar, V. Ravindra, H. Saito, J. Hirokawa, T. Fukami, “Slot-Array Antenna Feeder Network for Space-borne X-band Synthetic Aperture Radar”, submitted to the Proceedings of IEEE Transactions on Antennas and Propagation, under review as of March 12, 2018.

■ Presentations

1) B. Pyne, V. Ravindra, P.R. Akbar, H. Saito, J. Hirokawa, “Performance Analysis of Edge-feed Rectangular Parallel Plate Slot-array Antenna Panel for Compact Space-borne X-band SAR System”, Proceedings of the International Conference on Electromagnetics in Advanced Applications (ICEAA) – IEEE Topical Conference on Antennas and Propagation in Wireless Communications (APWC), Verona, September 2017, pp. 407-410.

■ URLs for the Research Results on the Web

1) http://www.isas.jaxa.jp/topics/001134.html

Usage of JSS2

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: Intel MKL
Number of Processes: 2 – 80
Elapsed Time per Case: 12.00 hours

Resources Used

Fraction of Usage in Total Resources*1(%): 0.46

Details

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

Computational Resources
System Name	Amount of Core Time (core x hours)	Fraction of Usage*2(%)
SORA-MA	153.80	0.00
SORA-PP	443,619.62	5.55
SORA-LM	92,167.94	47.46
SORA-TPP	175.00	0.02

File System Resources
File System Name	Storage Assigned (GiB)	Fraction of Usage*2(%)
/home	991.82	0.69
/data	22,842.42	0.42
/ltmp	11,718.76	0.88

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	16.11	0.69

*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.