hubble space telescope engineering telemetry
DESCRIPTION
Hubble Space Telescope Engineering Telemetry. Tom Wheeler Chris Long. Agenda. Telemetry Flow. Onboard Telemetry Systems Tom Wheeler. How is SI Engineering Data Acquired Onboard HST?. SI C&DH (Science Instrument Control and Data Handling) Hardware Description. - PowerPoint PPT PresentationTRANSCRIPT
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Hubble Space TelescopeHubble Space Telescope
EngineeringEngineeringTelemetryTelemetry
Hubble Space TelescopeHubble Space Telescope
EngineeringEngineeringTelemetryTelemetry
Tom WheelerTom WheelerChris LongChris Long
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AgendaAgenda
Onboard Telemetry Systems (Tom)Onboard Telemetry Systems (Tom) Hardware DescriptionHardware Description Data Acquisition and HandlingData Acquisition and Handling Limit CheckingLimit Checking Science Data HeadersScience Data Headers
Ground Systems & Archives (Chris)Ground Systems & Archives (Chris) Data CharacteristicsData Characteristics UtilizationUtilization Data AccessData Access Improvements (SMOV)Improvements (SMOV)
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Telemetry FlowTelemetry Flow
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Onboard Telemetry SystemsOnboard Telemetry SystemsTom WheelerTom Wheeler
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How is SI Engineering Data Acquired Onboard HST?
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SI C&DH (Science Instrument Control and Data Handling) Hardware Description
Control Unit/Science
Data Formatter
NASA Standard Spacecraft Computer-1
Support Systems Module
Remote Interface
Units
Power Control Unit
Multiplexed Data Bus
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SI C&DH2
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RIU (Remote Interface Unit) Hardware Description
RIU’s are the common communication interface to the SIs (located within the SIs).
RIU’s are implemented in redundant pairs, with seven pairs on HST: – one pair for each of the five SI’s plus a pair the SI C&DH
• WFPC-2 has an additional RIU used for the AFMs.
– another pair was installed during SM-3B for the Cooling System– only one of each pair is fully active at a time
Each RIU provides:– 8 lines for serial digital commands – 64 lines for discrete commands – 64 lines for sampling serial digital, analog, and bi-level telemetry
points– EUs (Expander Units), that piggy-back onto a RIU, add additional
64 telemetry inputs and are used on some SIs
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Engineering Data HandlingThe SI C&DH has two telemetry collection
modes.– Fixed Format (NSSC-1 is safed) are:
• AF, FF, HF, PF, TF, XF, YF, ZF, C, D, E (rarely used except for Safe modes)
– Normal Format (NSSC-I is operating) are:• AN, FN, HN, PN, TN, XN, YN, ZN
Spacecraft Telemetry Distribution: Total 64 Words/minor frame– 10 words each for SI = 50 words – 14 words for SI C&DH – Same for every operational format (regardless of 4
or 32K rates)
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Science Data Handling
The CU/SDF collects science data from all five SIs for transmission to the SSR (in SSM) or processing within the NSSC1.
Also collects memory dumps from the NSSC1 for transmission to the ground via the SSM.
Output Rates:– 1Mb (used for all current/future SIs science data)– 32K (not used currently)– 4K (ESB Dumps and SI Memory logs)
Ability to add RS (Reed-Solomon, an error correcting code) or PN (Pseudorandom Noise) encoding to data.
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SI Interfaces
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Acquisition of Engineering Data from SIsThe are 3 type of Engineering data collections
– Normal Engineering Data (NED) - digital serial data to RIU– RIU direct - analog, bi-level– Special Engineering Data (SED) - digital serial data to RIU
Normal Engineering Data (NED) – Consists of key instrument parameters (analog and digital) giving visibility
into instrument state and operations– Analog engineering data is sampled directly from A/D Electronics (includes
temperatures, voltages, etc.) located in:• SES A/D electronics (all new SIs)• CEBs (ACS, STIS, and WFC3 CCD) A/D electronics• DEB (WFC3 IR) A/D electronics
– Mechanism status and position information is collected– MIE (ACS & STIS, DIB for COS) status is collected – NED collection task runs every 2.0 sec. except 0.5 sec. for NICMOS – Collected data is stored in current value table for subsequent transmission
to the SI C&DH and is used by the CS’s limit checking task– A circular A/D data buffer maintains approximately 2 minutes of data
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RIU Direct Data Telemetry – Analog and digital telemetry collected directly by the RIU. SI need not be
operating.– Used to monitor key telemetry while SI in SAFE mode but is also used
during normal ops.
Special Engineering Data Telemetry– 28 (used to be 35) bytes sent to the NSSC-1 every minor frame (0.5
seconds)– Contains information used by the NSSC-1
• Safing requests, suspend requests, executive status buffer messages, checksum indicator, minor frame count, flight software state (boot/operate), slew requests and reason for last reset.
Acquisition of Engineering Data from SIs
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Limits Monitoring
Two Types of limit monitoring• NSSC Executive (Safing Application Processor)
– Once a minute
– Only monitors RIU direct telemetry points
– 3 strikes and you’re out will cause suspend/safing
• SI Control Section Limit Checking– Done at the same rate as NED
– Done in Boot and in Operate
– Out of limits may cause suspend/safing (depends upon action in FSW)
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Standard Header Packet• The Standard Header Packet (SHP) is a fixed format data log generated by the NSSC-1
sent out prior to an instrument science data dump. The format of the SHP is shown in below. See DM-03D Rev M for BL9.0 for a complete description.
– Uplinked programmatic information for data identification– Portions of each SI Current Value Table– Copies of the most recent PIT tables– Unique log for each SI, provided by that SI’s application processor
Data Word Number Contents
1 Observation Number (least significant 8 bits of the 16-bit word), Requesting SI Source ID (most significant 8 bits of the 16-bit word)
2-130 ACS Portion of the Current Value Table (CVT)
131-259 NICMOS Portion of the CVT
260-388 STIS Portion of the CVT
389-517 COS Portion of the CVT
518-646 WFC3 Portion of the CVT
647-775 SI C&DH Portion of the CVT
776-795 SSM PIT
796-855 Forward Linked Data
856-877 ACS Unique Data
878-899 NICMOS Unique Data
900-921 STIS Unique Data
922-943 COS Unique Data
944-965 WFC3 Unique Data
Standard Header Packet Format
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SI Internal Science Data Headers• The SI internal science header is a fixed format data log generated by the CS
and sent out as the first line (965 words) in an instrument science data dump. A complete description of the internal science header is contained in the DM-06 for each SI. An ACS example is shown below:
– 1-255 (255 words) contain exposure specific information, e.g., programmatic numbers, instrument configuration, TDF responses, detector information. Some keywords found in science data’s FITS header are derived from this data.
– 256-605 (350 words) Eng. snapshot 1– 606-955 (350 words) Eng. snapshot 2
• For most science data files, the 1st snapshot is taken prior to the exposure start and the 2nd is taken just after the exposure completes. The one exception is when one exposure extends over multiple science data dumps, i.e., time-tag exposures. In this case, the first dump contains the 1st snapshot before the exposure starts and 2nd prior to the start of the dump. Subsequent dumps will only have the 2nd snapshot populated.
These two snapshots form the .SPT file
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Other Lesser Known Telemetry
• NSSC-1 Executive Status Buffer Messages– Reports when an error or out of limits violation occurs with the
SIs or SI C&DH. This log is always downlinked.
• SI Instrument Error Logs– Reports when an error or out-of-limits violation occurs within an
SI. This log is sometimes sent to the ground.
• Engineering Reports– Reports status and errors within the SI C&DH. Always
downlinked in Normal mode.
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Data Transmission • Engineering telemetry and science data are passed from
the SIC&DH to the SSM (Support Systems Module) for transmission to TDRSS or are recorded on the SSR (Solid State Recorder) for later transmission.
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Ground Processing/Storage Ground Processing/Storage Chris LongChris Long
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DownlinkDownlink
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Telemetry PipelineTelemetry Pipeline
Data WarehouseData Warehouse100% Mission
Data WarehouseData Warehouse100% Mission
Central StoreCentral StoreScience Inst. FOF
Central StoreCentral StoreScience Inst. FOF
Local ArchiveLocal Archive100% SI Monitors
Local ArchiveLocal Archive100% SI Monitors
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Data Quality (Gaps)Data Quality (Gaps)
• Real-time: Viewable with gaps.Real-time: Viewable with gaps.• Recent: All-points w/gaps.Recent: All-points w/gaps.• Historical: Change only, no gaps.Historical: Change only, no gaps.
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Data UtilizationData Utilization
AnalysisAnalysis• Random data extraction and manipulation.Random data extraction and manipulation.
TrackingTracking• Following evolutions in real-time.Following evolutions in real-time.• May include rapid turnaround plotting.May include rapid turnaround plotting.
MonitoringMonitoring• Regular products of systems of known interest.Regular products of systems of known interest.
TrendingTrending• Periodic long-term visualization Periodic long-term visualization
– Unrecognized performance variation.Unrecognized performance variation.• Consumable statistics.Consumable statistics.
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Archive AccessArchive Access
CCS Data WarehouseCCS Data Warehouse• Official HST engineering archive.Official HST engineering archive.• Requires software and HSTnet/CCS accounts.Requires software and HSTnet/CCS accounts.
• ITAR and support issues.ITAR and support issues.
Local SI Data Archive Local SI Data Archive • Engineers maintain SI monitor archive.Engineers maintain SI monitor archive.• No access limitations.No access limitations.
• But, no tools…But, no tools…
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Directory of MonitorsDirectory of Monitors
No Such Thing. Monitors Listed As:No Such Thing. Monitors Listed As:
SpacecraftSpacecraft• 1000’s maintained by systems engineers.1000’s maintained by systems engineers.
ObservatoryObservatory
• MSIDMSID U169U169• Mnemonic:Mnemonic: USCADCLKUSCADCLK
FOCFOC 205205 COSTARCOSTAR 157157 ACSACS 823823FOSFOS 200200 WFPC2WFPC2 255255 COSCOSGHRSGHRS 315315 NICMOSNICMOS 479479 WFC3WFC3HSPHSP 208208 STISSTIS 607607WFPCWFPC 217217 NCSNCS 790790
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Products (but no standards)Products (but no standards)
ContentContent• All-points or change-only.All-points or change-only.• Merging recorded data into ongoing analysis..Merging recorded data into ongoing analysis..
TimeTime• MJD, UTC, Day of Year.MJD, UTC, Day of Year.
Output FileOutput File• Delimited/interleaved/multiple independent files.Delimited/interleaved/multiple independent files.
ProductsProducts• Flat file, preload Excel, statistics, or plots.Flat file, preload Excel, statistics, or plots.
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Telemetry ATMTelemetry ATM
Directory
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Forward PlanForward Plan
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ImprovementsImprovements Telemetry directoryTelemetry directory Post productsPost products Extraction interfaceExtraction interface Visualization interfaceVisualization interface
SMOVSMOV Proactive monitor programProactive monitor program
Improved analysis toolsImproved analysis tools
ImprovementsImprovements Telemetry directoryTelemetry directory Post productsPost products Extraction interfaceExtraction interface Visualization interfaceVisualization interface
SMOVSMOV Proactive monitor programProactive monitor program
Improved analysis toolsImproved analysis tools
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Engineering Support Questions?Engineering Support Questions?