SN Beams SN Beams Display ToolDisplay Tool

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Launch Acquisition DataLaunch Acquisition Data

During a launch, the FDF supplies During a launch, the FDF supplies acquisition data to WSC, based on vectors acquisition data to WSC, based on vectors derived from the nominal launch derived from the nominal launch trajectory.trajectory.

WSC then commands the TDRS antennas WSC then commands the TDRS antennas to point to the orbiter, and then transmits to point to the orbiter, and then transmits Tracking Data Messages (TDMs) to the Tracking Data Messages (TDMs) to the FDF that indicate . . .FDF that indicate . . . Where the TDRS antennas are pointing (for Where the TDRS antennas are pointing (for

TDRS-8,9, and 10)TDRS-8,9, and 10) Where the TDRS antennas have been Where the TDRS antennas have been

commanded to point (for TDRS-1 through 7)commanded to point (for TDRS-1 through 7)7/13/20107/13/2010 22Jason LaingJason Laing

Launch Acquisition DataLaunch Acquisition Data

Challenges:Challenges: Involves software at the FDF, WSC, and on Involves software at the FDF, WSC, and on

board the TDRS.board the TDRS. The software and algorithms can differ The software and algorithms can differ

depending on which TDRS is supporting the depending on which TDRS is supporting the event.event.

Communication links between the FDF, Communication links between the FDF, WSC, TDRS.WSC, TDRS.

Problems/discrepancies at any step Problems/discrepancies at any step could result in an off-pointing TDRS.could result in an off-pointing TDRS.

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Tracking Data MonitoringTracking Data Monitoring

Traditionally, the TDMs have been Traditionally, the TDMs have been monitored in the FDF with a text display, monitored in the FDF with a text display, known as the TDRS Beam Angle (TBA) known as the TDRS Beam Angle (TBA) display.display. Monitors the difference between the Monitors the difference between the computedcomputed

angles and the angles and the observedobserved angles of the TDRS. angles of the TDRS. Computed: based on the nominal ephemeris, shows Computed: based on the nominal ephemeris, shows

the angle of the antenna if it were pointing at the the angle of the antenna if it were pointing at the ideal trajectory.ideal trajectory.

Observed: based on the tracking data messages, Observed: based on the tracking data messages, shows exactly where the TDRS is pointing (or where it shows exactly where the TDRS is pointing (or where it has been commanded to point).has been commanded to point).

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TDRSS Ephemerides

TDRS BEAM ANGLES 134/19:27:22 SAT NAME ATLAS V ATLAS VSIC/VIC 3332/02 3332/02 TDRS NAME TDRS-7 TDRS-5 SIC/VIC 1306/01 1304/01 MODE TWO-WAY TWO-WAY RETURN LINK SSA2 SSA2 ORIENT/BEAM VAL/VAL VAL/VAL TIME 134/19:12:50 134/19:27:06 AZIMUTH (C) 3.1369 -2.4947 ELEVATION (C) -5.1042 -6.1802 AZIMUTH (O) 3.1423 -2.4879 ELEVATION (O) -5.1022 -6.1730 AZIMUTH (O-C) .0054 .0068 ELEVATION (O-C) .0020 .0072 SPATIAL BEAM (O-C) .0057 .0099 YAW (O) .3323 .3268 ROLL (O) .0357 359.9918 PITCH (O) 359.9753 .0027

Tracking DataMessages (TDMs)

Observed Angles(from TDMs)

Computed Angles(from Ephem)

O-C Beam Angles

Spatial Beam Angles

Spacecraft Ephemerides

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SN Beams DisplaySN Beams Display

The SN Beams display presents a graphical The SN Beams display presents a graphical representation of the observed and computed representation of the observed and computed angles.angles. Computed angles are displayed as a green beam.Computed angles are displayed as a green beam. Observed angles, from the actual TDMs, are Observed angles, from the actual TDMs, are

displayed as a white beam.displayed as a white beam. Provides a quick display of . . .Provides a quick display of . . .

Where the TDRS is pointing.Where the TDRS is pointing. Where the TDRS Where the TDRS shouldshould be pointing. be pointing. How close the orbiter is to the edge of the 3-dB How close the orbiter is to the edge of the 3-dB

beam width.beam width. The general geometry of the situation.The general geometry of the situation.

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Satellite Tool Kit (STK)

TDRSS EphemeridesTracking Data

Messages (TDMs) Spacecraft Ephemerides

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Questions - CommentsQuestions - Comments

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AcronymsAcronyms

ADGADG Acquisition Data GeneratorAcquisition Data Generator AFSCNAFSCN Air Force Satellite Control NetworkAir Force Satellite Control Network AOAAOA abort once aroundabort once around ATOATO abort to orbitabort to orbit DoDDoD Department of DefenseDepartment of Defense ECALECAL East Coast abort landingEast Coast abort landing EMCCEMCC Emergency Mission Control CenterEmergency Mission Control Center ERER Eastern RangeEastern Range ERBSERBS Earth Radiation Budget SatelliteEarth Radiation Budget Satellite EUVEEUVE Extreme Ultra-Violet ExplorerExtreme Ultra-Violet Explorer FDFFDF Flight Dynamics FacilityFlight Dynamics Facility FDOFDO Flight Dynamics OfficerFlight Dynamics Officer GNGN Ground NetworkGround Network GTDSGTDS Goddard Trajectory Determination Goddard Trajectory Determination

SystemSystem HSTHST Hubble Space TelescopeHubble Space Telescope JSCJSC Johnson Space CenterJohnson Space Center KSCKSC Kennedy Space CenterKennedy Space Center MECOMECO main engine cutoffmain engine cutoff MILMIL Merritt IslandMerritt Island MTDEMTDE Metric Tracking Data EvaluationMetric Tracking Data Evaluation NDND Network Director Network Director

NICNIC Network Integration CenterNetwork Integration Center NOMNOM Network Operations ManagerNetwork Operations Manager ODOD orbit determinationorbit determination OMSOMS Orbital Maneuvering SystemOrbital Maneuvering System PAOPAO Public Affairs OfficePublic Affairs Office PMRPMR Pacific Missile RangePacific Missile Range RTLSRTLS return to launch sitereturn to launch site SLFSLF Shuttle Landing FacilityShuttle Landing Facility SMMSMM STDN Mission ManagerSTDN Mission Manager SNSN Space NetworkSpace Network STDNSTDN Spaceflight Tracking and Data NetworkSpaceflight Tracking and Data Network STGTSTGT Second TDRSS Ground TerminalSecond TDRSS Ground Terminal STSSTS Space Transportation SystemSpace Transportation System TALTAL transoceanic abort landingtransoceanic abort landing TBATBA TDRS Beam AngleTDRS Beam Angle TDRSTDRS Tracking and Data Relay SatelliteTracking and Data Relay Satellite TDRSSTDRSS Tracking and Data Relay Satellite Tracking and Data Relay Satellite

SystemSystem UARSUARS Upper Atmosphere Research SatelliteUpper Atmosphere Research Satellite WSCWSC White Sands ComplexWhite Sands Complex WSGTWSGT White Sands Ground TerminalWhite Sands Ground Terminal WRWR Western RangeWestern Range

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