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MDP / DHU - DR Usage vs downlinks -

MDP / DHU - DR Usage vs downlinks -. Keiichi MATSUZAKI (ISAS). Data Flow from Telescope to Ground. Software guard for total volume in certain period is possible. Buffer. 12Mbps. SOT. SOT. 1400kbps (2000). ~2.4Gbits /downlink (4Mbps). 64Mbits. Bit Comp. + Image Comp. 3Mbps.

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MDP / DHU - DR Usage vs downlinks -

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  1. MDP / DHU - DR Usage vs downlinks - Keiichi MATSUZAKI (ISAS)

  2. Data Flow from Telescope to Ground Software guard for total volume in certain period is possible Buffer 12Mbps SOT SOT 1400kbps (2000) ~2.4Gbits /downlink (4Mbps) 64Mbits Bit Comp. + Image Comp. 3Mbps DR XRT XRT 300kbps (0) >5Gbits 64Mbits 2Mbps EIS EIS 300kbps (0) 64Mbits MDP DHU Earth

  3. Pre-flare (mode trigger) bufferfor XRT Normal (FIFO 16Mbit) Ring-1 12PFI Ring-2 18PFI Ring-3 28PFI Quiet mode Flare mode PFI < 256x256 (for larger image # of image decrease)

  4. Data Recorder • Simple ring buffers (size > 8.0 Gbits) • One partition for SOT, XRT & EIS (+MDP) • One partition for S/C • No priority control • Stop or overwrite @ full (selectable) • Simultaneous Recording & Downlink • One partition for downlink Record (Write Pointer) Play back (Read Pointe)r

  5. Down link • 4Mbps(X-band) • Bottle neck for total amount of data • 32kbps(S-band) - For S/C • 150 minutes of down-link / day • 4 KSC + 12 Polar stations / day • 2.4Gbits/downlink, ave. recording rate 400kbps

  6. SOT 1400Mbits (70%) FG 1100Mbits (55%) SP 300Mbits (15%) XRT 300Mbits (15%) Partial Frame 225Mbits (11.25%) Full Frame 75Mbits (3.75%) EIS 300Mbits (15%) Example ofSharing of Telemetry (per downlink) • Ratio can be modified in Weekly Observation Meeting depending on campaign

  7. Example 1Constant Rate with Clean up of DR Play back 250kbps = 8 pass/day 1Rev. 2Rev.

  8. Example 2Burst Rate with Clean up of DR Play back 2000kbps Total 20min Stop Obs. Stop Obs. Stop

  9. Daily Allocation for Chief Observer 2003/2/4 10:00:00 2.5 2003/2/4 12:00:00 2.5 2003/2/4 14:00:00 2.5 2003/2/4 10:00:00 3.2 2003/2/4 12:00:00 3.2 2003/2/4 14:00:00 3.2 Downlink start time Allocated Volume for Planning Limit Set by MDP for telemetry guard Format is TBD

  10. Example 3Mixed Case, Empty out of DR

  11. Example 4Average Rate ~ day • Margin for uncertainty • Flare event • Compression Result 2000kbps合計20分 DR size = 8.0G bits 休止 観測 休止 観測 休止

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