THEMIS FDMO CDR Peer Review − FOT Activities 1June 1-2, 2004 FOT Activities Mark Lewis

THEMIS FDMO CDR Peer Review − FOT Activities 2June 1-2, 2004 FOT Activities Overview Lessons Learned Mission Operations Training Integration and Test Involvement

THEMIS FDMO CDR Peer Review − FOT Activities 3June 1-2, 2004 Lessons Learned Heritage at SSL Mission Operations at SSL –EUVE, FAST, RHESSI, CHIPS –FAST, RHESSI Already use ITOS –EUVE Used TDRSS (4 Members of FOT Herald Back to EUVE) Gather Lessons Learned from Existing Constellation Missions –Globalstar: Consulted with Operations Personnel and One of the GDS Designers –Iridium: Tour and Consultation Scheduled for June 3, 2004 –Cluster: Schedule Tour Take Advantage of Lessons Learned –THEMIS Ground System Design –THEMIS Mission and Science Operations Plans

THEMIS FDMO CDR Peer Review − FOT Activities 4June 1-2, 2004 Globalstar Lessons Learned Test Each Spacecraft Carefully Before Launch –Assembly Line Approach Led to Multiple Satellites with Improperly Wired Magnetometers Test Flight Software Patches Carefully Prior to Uplink –Automated Uplink Process Caused Multiple Spacecraft to Lose Attitude Control Before Process Could be Halted Employ Modern Automation Techniques –Save Operations Costs and Enhance Reliability Provide Diagnostic Tools –Flexible Tools Allow Engineers and Scientists to Compare Trends Between Different Spacecraft Ideas Which Turned out to be Not Useful –Plan for Contingencies on Routine Basis in Daily Pass Schedules –Plot Trends for Multiple Spacecraft on Top of Each Other –Allow Operators to Set Their Own Limits –Sophisticated Database to Track Anomalies Across Satellites

THEMIS FDMO CDR Peer Review − FOT Activities 5June 1-2, 2004 Mission Operations Mission Operations Phases Launch & Early Orbit Checkout –Probe and Instrument Checkout –Maneuver Operations for Initial Orbit Placement –Contingency Operations Normal Operations –Science Data Acquisition –Maneuver Operations for Orbit Optimization –Contingency Operations Mission Termination Operations –Maneuver Operations to Initiate Re-entry –Instrument Shutdown

THEMIS FDMO CDR Peer Review − FOT Activities 6June 1-2, 2004 Normal Operations Mission Planning During Normal Operations –Preparation of the Conjunction Season –Ground Station Contact Schedules –Build and Check ATS Loads (Checked by Two People) Probe Command and Control –Probe Health and Safety Monitoring –Recovery of Science and Engineering Data –Uplink ATS Twice per Week –Clock Adjust Operation –Instrument Configuration Attitude & Orbit Determination –Routinely Performed Multiple Times per Week Data Trending & Monitoring –Monitor Autonomously Created Trend Plots –Create Special Plots as Needed Maneuver Planning and Execution

THEMIS FDMO CDR Peer Review − FOT Activities 7June 1-2, 2004 Normal Operations Probe Health & Safety MOC Staffing During Launch & Early Orbit Operations –UCB Flight Operations Team Operating at SSL –24 Hour Staffing with Prime and Secondary Shifts –Critical Commanding During Prime Shift Only –Swales and UCB Engineering Team in MOC During Prime Shift Passes –Instrument Scientists in MOC During Instrument Commissioning –BEARS Monitors All VC0 and VC1 Data MOC Staffing During Normal Operations –THEMIS Follows FAST/RHESSI/CHIPS Model –Normal Operations Eventually Will Run with 8 x 5 Staffing –Lights-Out Operations During Off-hours Successfully Demonstrated –Transition to Autonomous Operations After First Tail Season –Attitude & Orbit Maneuvers Treated as Special Operations –BEARS Monitors All VC0 and VC1 Data

THEMIS FDMO CDR Peer Review − FOT Activities 8June 1-2, 2004 Normal Operations ATS Loads Build and Uplink Two ATS Loads per Week –Standard Operating Procedure for Building ATS Load Merge Products in MPS –SatTrack Orbit Products –Station Contacts –Clock Adjust Commands –Instrument Commands –Special Operations Commands Load Checked by Two People –Standard Operating Procedure for Checking Loads Do Not Uplink During Special Operations Passes

THEMIS FDMO CDR Peer Review − FOT Activities 9June 1-2, 2004 Normal Operations Maneuver ATS Loads Only One Maneuver Sequence per ATS Load Maneuver Operations Will Use ATS Pointer Skip Function :00:00 Start AOS RTS :00:10 Skip Pointer to Cmd :03:00 First Command of Maneuver Sequence 113 … :07:00 Last Command of Maneuver Sequence :10:00 Start LOS RTS Controller Skips Pointer Back To Maneuver Start When Ready –Good Two-Way Established –Health & Status Established –Attitude Determined to be Correct –Operations Manager Signals OK

THEMIS FDMO CDR Peer Review − FOT Activities 10June 1-2, 2004 Probe Clock Adjustment No Clock Adjustments During Science Collection or Other Special Operations (Maneuvers, Boom Deployment, etc) ITOS Compares Frame Transmit and Receive Times and Adjusts Clock Delta in Real-time During Pass Supports: ΔT = T frame received − T frame transmitted − T range delay ATS Loads May Include Commands to Periodically Adjust Clock Drift in Small Steps Requires Time Stamping of Telemetry Transfer Frames –On Probes and by All Ground Stations, Ideally with Accuracy of 1 ms Requires Range Information from SatTrack Gateway Server for Specified Time –Range Requested by ITOS for Time When Frame Received at Ground Station Scheme Combines Ground Controlled and ATS Controlled Options –Allows for Maintaining Probe Clocks Well Within Required Absolute Accuracy of ± 500 ms

THEMIS FDMO CDR Peer Review − FOT Activities 11June 1-2, 2004 Probe Clock Adjustment

THEMIS FDMO CDR Peer Review − FOT Activities 12June 1-2, 2004 Normal Operations Attitude Determination Real-time, Ground Based Attitude Determination –Slew Monitoring During Maneuvers for Fault Protection –Data Provided by Sun Sensor and Inertial Reference Units –Sensor Data Processed in Real-time by MSASS –MSASS Polls ITOS for Sensor Data –Processes Sensor Data –Returns Solution to ITOS as GND Telemetry –Cross-calibration of Sun Sensor with FGM Near Perigee Post-pass, Ground Based Attitude Determination –Required for Science Data Analysis –Data Provided by Sun Sensor and FGM –Determine Attitude Accurately for Selected Orbit Arcs and/or Back Orbits –Attitude Solution Obtained using MSASS –Heritage using MSASS for FAST Attitude Determination

THEMIS FDMO CDR Peer Review − FOT Activities 13June 1-2, 2004 Normal Operations Trend Analysis Daily Plots of Important Systems –Plots Created Autonomously and Placed on Web –See RHESSI State of Health Web Page as Example – Long Term Trend Plots –Produced Autonomously by BTAPS for Important Systems –Available on the Web –Produce Unique Plots Using BTAPS Web Interface –Available to FOT, Mission Scientists and Engineers FOT Will Analyze Trend Plots on a Daily Basis –Watch for Trends Which Indicate a Problem is Developing Before Limit Violations Occur –Consult With Experts on Trend Developments

THEMIS FDMO CDR Peer Review − FOT Activities 14June 1-2, 2004 Normal Operations Contingency Operations Anomaly May be Detected by FOT or BEARS –FOT Monitors Real-time Passes and Trend Data BEARS Monitors Every Pass and All Back Orbit Data –Pages FOT On Detection of Limit Violation –Paging Is Persistent With Anomaly Information Included in Page –Additional Information Available via BEARS Web Interface –Paging Persistent Until Acknowledged (Two-way Pagers, Web) On-Shift/On-Call Controller Evaluates Severity of Anomaly Controller Notifies Operations Manager –Open Anomaly Report –Operations Manager Calls in Instrument Specialists or Spacecraft Engineers as Needed –Operations Manager Notifies Project Manager, PI and Mission Director in a Timely Manner

THEMIS FDMO CDR Peer Review − FOT Activities 15June 1-2, 2004 Normal Operations Anomaly Resolution Flight Controllers Are Well Trained and Authorized to Respond Immediately to Anomalies When Necessary –With Short Passes, Controllers Must be Ready to Safe the Probe Quickly Before Seeking Outside Authorization –Anytime a Probe Is Not in Immediate Danger, Operations Manager Will Be Contacted Before Proceeding –Operations Manager Should Be Present During Anomaly Recovery Recovery Implemented Using Documented Contingency Procedure –New Contingency Procedures Developed and Implemented With System Experts on As Needed Basis –Lessons Learned Used to Update Existing Contingency Procedures Anomalies and Resolution Reported in Updates to THEMIS Team and in Weekly Report to Mission Director and Anomaly Database

THEMIS FDMO CDR Peer Review − FOT Activities 16June 1-2, 2004 Training FOT Training Experienced FOT –ITOS, MPS, TDRSS, GN, MSASS, SatTrack –EUVE, FAST, RHESSI, CHIPS Certification Training Checklist –Training Sessions with Subsystem Engineers –Power, Thermal, C&DH (BAU), ACS, RCS, Telecom –IDPU, Instruments –Study Subsystem User Guides –FlatSat Exercises (Anomaly Training, FSW Testing) –Demonstrate Proficiency with Ops Tasks –Building & Checking Loads –BEARS & BTAPS –Cross Training on Attitude & Orbit Determination –ITOS Setup, Operation, Page Building and Procedure Writing Written Certification Exam

THEMIS FDMO CDR Peer Review − FOT Activities 17June 1-2, 2004 I&T Involvement FOT Directly Involved in Integration & Testing FOT Will Sit Console During During Integration & Testing at Swales and Environmental Testing at GSFC –Two or More Members of FOT in Greenbelt Throughout Testing –Rotate FOT Personnel Between Berkeley and Greenbelt –Active Participation During I & T Provides FOT With Superior Knowledge of Probes and Preparation for On-orbit Anomalies ITOS Will be Used as Interface During Testing –Makes Operators Comfortable With On-Orbit Command & Control System –Same Pages and Procedures Can Be Used On-Orbit Console Operations During Testing –Monitor Probe Health & Status –Run Established ITOS Procedures –Send Discrete Commands When Directed by Subsystem Engineers –Record Results and Anomalies Special Operations Conducted Under Supervision of System Engineers –All Tests and Commanding Scheduled in Advance

THEMIS FDMO CDR Peer Review − FOT Activities 18June 1-2, 2004 I&T Involvement ITOS Pages & Procs FOT Will Produce ITOS Pages for Various Subsystems –Follow Standard Page Format FOT Will Produce ITOS Procedures –Typical Operations Activities –Write Procs in Cooperation With Engineers and Scientists Standard Operating Procedures Written Procedures For Nominal and Contingency Operations –Maintain Binder of Procedures Within Reach of Console –Many Procedures Developed or Updated During I&T Nominal Operations and Commands –Procedures Which Can be Run Without Supervision –ATS Loads, Clock Adjust, etc