 |
 |
| Pressurized Module |
|
| Image Processing Unit: IPU |
|
|
 General Description
IPU (PFM) |
The Image Processing Unit (IPU) receives image data from various experiment equipment in Kibo, encodes those data, then transfers the encoded data to Kibo system lines. The IPU also records experiment image data on tape in VTR systems when real-time data downlink is not available. The main functions of the IPU are to have various interfaces with Kibo systems and experiment equipment, to receive and decode five channels of independent motion video signals simultaneously, and to record video signals on the tape with five digital VTRs continuously (up to 120 min. each).
Specifications
| Dimensions |
|
1/4 DR, W482 x H621 x D660mm |
| Interface |
|
1553B, RS422, Video signal, Ethernet, HRDL |
| In/out data |
|
In |
NTSC video, Telemetry, Operation
Commands, Digital Still Image |
|
|
Out |
H&S Data, Control Commands,
Encoded data (MPEG2) |
| Image Processing |
|
MPEG2, 5ch multiplex, 1ch Decoding |
| Data Storage |
|
Digital VTR (x6), Removable HD |
| Crew I/F |
|
Operation Panel, 12.1 inch LCD |
Main
Subsystem
| Digital video |
6 videos, DVCpro (upper compatible with DVC) up to
120 minutes/each video |
| Compression Board |
-2 channels MPEG2 encode in one board. (IPU has three boards.)
-MPEG2 Main Profile at Main Level (MP@ML) 704x480-pixel
-MPEG2 Main Profile at Low Level (MP@LL) 352x240-pixel
-Transaction rate 2-15Mbps (0.5Mbps step)
-GOP length 1-127pictures (selectable) |
| selectable with command |
GOP length 1-16
IP Distance 0-2 |
| LCD |
12.1inch color TFT monitor (1024x768,XVGA); Touch
Panel |
| Hard Disk Drive |
18Gbytes (for data stowage) |
Operation
-IPU can be normally operated with ground
commands.
-The only crew task in normal operation is to exchange the video tapes.
-There are two paths for downlink from IPU(ISS) to ground. One path is
via US relay satellite. The other is via Japanese data relay satellite.
(See right figure)
-IPU provides one FDDI channel to downlink which enables downlink operation
up to five NTSC video sources.
-During downlink of the video data, IPU can also record those data on
video tape.
-MPEG2 parameters are variable at IPU so that the downlink video data
can apply to both quick-look purpose and analysis purpose. ( See "Main
Subsystem" for more detail information.)
|
 |
FAQ
| Q; Why does JAXA develop IPU? |
A; The most critical path at International
Space Station is the limitation of the downlink data channel for
users. Using IPU, users can downlink up to five video data channels
with through FDDI channel, using the compression function of the
video data. |
| |
| Q; If I like to use IPU, what should I
do? |
A; If you are planning to use JAXA multiuser
facilities( GHF, SPCF and FPEF),
only you have to do is to check that you would like to use IPU in
your proposal.
If you are not planning to use JAXA multiuser facilities, please contact us. |
Last Updated : February 9, 2005
|
