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PET EST STONES 
490 
2. HARDWARE 
In order to process SAR data, two processors are used. One is a super- 
computer, FACOM VP-200, and the other is a general purpose computer, FACOM 
4-380. The hardware configuration is shown in Fig.l. These processors are 
loosely coupled through the shared disks. The processing load is shared between 
these processors. FACOM M-380 ( FEP: Front End Processor ) , which has 16 MB 
main memory, performs scalar operations and FACOM VP-200 ( BEP : Back End 
Processor ) , which has 64 MB main memory, performs vector operations mainly. 
The disks are shared by two processors and the volume per disk is 1.7 GB. Two 
magnetic tape units are used to input SAR raw data and output SAR image data. 
The density of these units is 6250/1600 BPI. 
  
M-380 
MEM : 168 
  
  
  
  
  
  
  
AN m) DISK Ed 
6250/1600EPI 
T (ir) 1.7GB 1.7GB 
  
  
FIG. 1 HARDWARE CONFIGURATION 
(43 (5) 
FACOM VP-200,/VP-100 is the vector processor with maximum performance rate 
of 533 MFLOPS- 267 MFLOPS and large main memory of up to 256 4B//128 MB, 
respectively. The block diagram of VP-200,YP-100 is shown in Fig.Z.