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THEMIS IDPU FSW V4 Introduction Part IV Triggers June 20, 2006

THEMIS IDPU FSW V4 Introduction Part IV Triggers June 20, 2006. Agenda. Part IV Triggers REQUIREMENTS SPECIFICATIONS ORBIT EVENTS FUNCTIONAL DEFINITIONS FUNCTIONS ION VELOCITY E-FIELD B-FIELD AKR FILTERS ION DENSITY PRESSURE DEVELOPMENT PLAN. Requirements. Basics

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THEMIS IDPU FSW V4 Introduction Part IV Triggers June 20, 2006

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  1. THEMIS • IDPU FSW V4 • Introduction • Part IV • Triggers • June 20, 2006

  2. Agenda • Part IV Triggers • REQUIREMENTS • SPECIFICATIONS • ORBIT EVENTS • FUNCTIONAL DEFINITIONS • FUNCTIONS • ION VELOCITY • E-FIELD • B-FIELD • AKR • FILTERS • ION DENSITY • PRESSURE • DEVELOPMENT PLAN

  3. Requirements • Basics • Capable of Running on 8085 concurrent with Spin Fits, High Speed Telemetry • RAW Data input from Sensors in Real Time • Produce Results Fast Enough to be Useful (< 1 spin) • Calculation Should Produce 8-bit 0-255 value for Burst Evaluation • Calculations Should Not Always Produce Max (255) or Min (000) • Calculations Should not Trigger on Junk Events (e.g. eclipse entry, etc) • Trigger Packet will provide data on ALL trigger functions useful in commissioning period • Test Requirements • Test on the Instruments on the Ground, Only Verify in Orbit • Computer simulations do not have required fidelity • Maintain a Functional Instrument (Spare) or ETU on ground for testing modifications • Use the Spare Probe for Verifying triggers in orbit • Coordination of trigger modifications will have to be improved • New trigger development and test will take several weeks depending upon complexity.

  4. Specification • Recent Activities • Historically, THM_FSW_003_CTM contained the Filter Formulae • FSW Versions thru 4.0 were built to this specification • New Formulae were suggested for E-Field, B-Field and ESA triggers • FSW Version 4.00e was developed and tested in May • THM_FSW_223_SCI described the implementation of these triggers (5/27) • Email traffic suggested the triggers needed redefinition • Drop-dead date of 5/31/06 established but missed. • Tech Memo 6/2/06 (Bonnell) to nail down the discussions • MSE (Taylor) request to team to sign the 6/2/06 Tech Memo. No response • Emergency meeting on Triggers 6/14/06 produced updated Tech Memo and a new request to sign it. No response. • Continued Email traffic on Scale Factors and formulae • This meeting on Triggers 6/20/06. • Status & Recommendation • Flight Software V4.01 is ready except for Triggers • We Should Have Functionality in V4.01 that is not in V4.00 (currently in Probes) • Without a signed specification today, FSW V4.01 will include no triggers • It is not clear if a V4.02 is practical before launch.

  5. P2 ORBIT EVENTS TAIL SEASON w/ ECLIPSE 42:00: PASS START /IDPURAWHEX 1084 ;ENABLE BURST XMIT /ITMENABLE F ;PLAY ALL SEGMENTS WAIT 1 /ITMPLAY ;ENGAGE 30:00: SLOW SURVEY MODE /IDPURAWHEX 1005 ;TRIGGER DISABLE /IDPURAWHEX 1003 ;WBURST DISABLE /IDPURAWHEX 1002 ;PBURST DISABLE /IDPURAWHEX 1001 ;SLOW SURVEY /IDPURAWHEX B80F ;COMPRESS ALL 42:30: PASS END /IDPURAWHEX 1004 ;DISABLE BURST XMIT /ITMENABLE 0 ;STOP FIFO ACTIVITY 47:00 MAG CAL ON 25:00: ECLIPSE EXIT /ISCRIPTEXEC 91 34:00: 100% COMPRESSED 00:00 01:00 MAG CAL OFF 23:00: ECLIPSE ENTRY /ISCRIPTEXEC 90 18:00: FAST SURVEY, BURSTING MODE /IDPURAWHEX 1081 ;FAST SURVEY MODE /IDPURAWHEX 1082 ;PBURST ENABLE /IDPURAWHEX 1083 ;WBURST ENABLE /IDPURAWHEX 1085 ;TRIGGER ENABLE Orbit Period : 48 hours Fast Survey : 12 hours Compression: 4 hours

  6. DEFINITIONS • POS(x) = x, if x>0, and 0 if x<=0.  This is used to implement an "onset" filter that has high value when things are increasing, but minimal value when they are decreasing. • IIR4() filter is defined as follows: Fn = (3*Fn-1 + Xn ) / 4. • LIMIT12() is used for values to be filtered. If a filter-input value is larger than 12 bits, it is limited to 12 bits. This protects the filter from taking on large values it cannot reasonably recover from. • All formulae should target 12-bit results internally. The filter will carry 12-bits and the ultimate trigger value will be the upper 8 bits of the 12-bit value. This allows the filter to finally settle on the input value. • SCALE is TBD scale factor to bring relevant range of trigger qty into 8-bit range; TBR values for SCALE are included if they are currently known.  All the SCALE factors for a given set of trigger functions would live in a table of some sort (SCI table?).

  7. ION VELOCITY • Function: VXYPurpose: PB trigger.Region/Probe/Rationale: Tail/P1,P2/Boundary Layer Tail/P3,4,5/Tail/Current disruptionData Source: Moments packet. • Calculation Period: 1/Spin • Algorithm: • q = LIMIT12[ SCALE_VXY*sqrt( NVX_IESA2 + NVY_IESA2)/N_IESA ] • VXY = POS( q - IIR4(q)) /16 • Note1: SCALE_VXY is a FLOAT value such that q is 12-bit. • Note2: If N_IESA is zero, the calculation is not attempted and VXY is not updated.

  8. E-FIELD • Function: EYPurpose: PB trigger.Region/Probe/Rationale: Tail/P3,4,5/Convective flowsData Source: Spin Fit E-Field. • Calculation Period: 1/Spin • Algorithm: • q = LIMIT12 [ C_E * 2SCALE_EY] • EY = POS( q - IIR4( q)) /16 • Note1 : C_E is sin() coefficient from E-field spin fit, and has a range of [-1, +1], corresponding to the +/- 300 mV/m range of the EDC channels. • Note2 : The objective is to have a 10 mV/m jump correspond to ~ 100 for EY. • Note3 : The default 2SCALE_EY is 65536.

  9. B-FIELD • Function: BZPurpose: PB trigger.Region/Probe/Rationale: Tail/P3,4,5/Dipolarization, noise; Dayside/all/Noise in Cavities, HFAsData Source: Spin Averaged B-field. • Calculation Period: 1/Spin • Algorithm: • q = LIMIT12[ SCALE_BZ*ABS(SpinAverage(FGMx)) / 2RANGEX ] • BZ = ABS( q - IIR4(q)) /16 • Note1: FGMx is the spin axis magnetic input, a 16-bit value. • Note2 : The objective is to have a 20 nT jump correspond to ~100 for Bz • Note3: SCALE_BZ is an 8-bit unsigned value (default 8) • Note4: RANGEX is a 4-bit code used to amplify the signal into the Spin Fitter. It is used here to correct for gain changes in the range.

  10. AKR • Function: AKRPurpose: PB trigger.Region/Probe/Rationale: Tail/all/Auroral onsetData Source: APID 451, HFavg field. • Calculation Period: 1/Sec • Algorithm: • q = LIMIT12[ SCALE_AKR*Hfavg ] • AKR = POS( q - IIR4( q)) /16 • Note1: SCALE_AKR is 8-bit unsigned value (Default 16); • Note2: 12-bit limit applied to the 8x8 bit calculation

  11. FILTERS • Function: FBPurpose: WB trigger.Region/Probe/Rationale: Tail/all/substorm waves; Radbelt/all/storm waves; Dayside/all/mpause, shock, upstream wavesData Source: IFILTER1, IFILTER2 (from DFB). • Calculation Period: 1/Sec • Algorithm:q = LIMIT12[ SCALE_FB1*IFILTER1 + SCALE_FB2*IFILTER2 ] • FB = POS( q - IIR4( q)) /16 • Note1: SCALE_FB1 and SCALE_FB2 used to bring units and relative amplitudes of the two selected filter bank channels onto an equal (or unequal) footing; both are 8-bit unsigned values (Default 8); • Note2: 12-bit limit applied to the sum of 2 8x8 bit calculations • Note that IFILTER1 and IFILTER2 can be set to point to any of the elements of the FilterBank data; ie. both in FB1; one in FB1 and one in FB2; both in FB2.  This freedom can be exploited to make a trigger function that is sensitive to two different sorts of wave phenomena in the E-field or B-field data, for example.

  12. ION DENSITY • Function: NIPurpose: PB trigger.Region/Probe/Rationale: Dayside/all/HFAs and cavitiesData Source: Moments packet. • Calculation Period: 1/Spin • Algorithm:q = LIMIT12[ SCALE_NI*N_IESA ] • NI = abs( q - IIR4( q)) /16 • Note1 : SCALE_NI is a FLOAT used to reduce N_IESA to 12-bitsNote2: 12-bit limit applied to the integer value q.

  13. PRESSURE • Function: SST_PRESPurpose: PB trigger (WB trigger for RadBelt science).Region/Probe/Rationale: Tail/P1,2/Boundary Layer Beams; Radbelts/all/Substorm injection, particle acceleration; Dayside/P1/Upstream eventsData Source: Moments packet. • Calculation Period: 1/Spin • Algorithm:q1 = SCALE_SSTF1[ log2( MXX_ISST ) + log2(SST_ATTEN) ]q2 = SCALE_SSTF2[ log2( MXX_ESST) + log2(SST_ATTEN) ]SST_FLUX = POS(q1-IIR4(q1)) + POS(q2-IIR4(q2)) • Note1: log2(SST_ATTEN) = correction factors for SST OPEN = 0, CLOSED=7; • Note2: SCALE_SSTF1 and SCALE_SSTF2 used to put electon and ion fluxes on equal (or unequal) footing. • Note3: When attenuator state switches, filters will be reset to the current value. This will make SST_FLUX zero in that spin, but keep the system from having a glitch. • Note4: Expected input values for Mxx_ISST and ESST are 32-bit positive values.

  14. PLAN • Problem: Dwindling Development Capabilities • Flight Instruments all on Probes • Probe Environmental Tests Require Team at JPL • Probe GSE Does Not Support Trigger Input Signals • SST/ESA Reformatting (Revision 5) Needs to be Tested • Formulae are Complex Enough – Could Cause On-Orbit Resets in Limiting Cases • Work to be Done • ETC Rev 5 Integration and Test on ETU • Update CTM to Include New Packet Lengths to support Rev 5 • Update Change Requests to Record SCR-52 • Generate Test Sets for the New Functions in TEST_SCR52 • New Packet Lengths and Displays on the GSE to support Rev 5 • FSW Trigger Module Numeric Properties and Performance Estimates • FSW Trigger Module Integration and Test on ETU with Simulated Data • FSW Version 4.01 Regression Test on ETU • FSW Version 4.01 Orbit Simulations (Long Duration Tests) on ETU • FSW Version 4.01 Installation on Probe 2 • Post PCA Vibration Date is 7/21/06 • Instrument CPT on Probe 2 • FSW Version 4.01 Installation on Probes 1,3,4,5 • Post TV Date is 8/11/06 PSR

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