SN Beams Display Tool 7/13/20101Jason Laing

Launch Acquisition Data During a launch, the FDF supplies acquisition data to WSC, based on vectors derived from the nominal launch trajectory. During a launch, the FDF supplies acquisition data to WSC, based on vectors derived from the nominal launch trajectory. WSC then commands the TDRS antennas to point to the orbiter, and then transmits Tracking Data Messages (TDMs) to the FDF that indicate... WSC then commands the TDRS antennas to point to the orbiter, and then transmits Tracking Data Messages (TDMs) to the FDF that indicate... Where the TDRS antennas are pointing (for TDRS-8,9, and 10) Where the TDRS antennas are pointing (for TDRS-8,9, and 10) Where the TDRS antennas have been commanded to point (for TDRS-1 through 7) Where the TDRS antennas have been commanded to point (for TDRS-1 through 7) 7/13/20102Jason Laing

Launch Acquisition Data Challenges: Challenges: Involves software at the FDF, WSC, and on board the TDRS. Involves software at the FDF, WSC, and on board the TDRS. The software and algorithms can differ depending on which TDRS is supporting the event. The software and algorithms can differ depending on which TDRS is supporting the event. Communication links between the FDF, WSC, TDRS. Communication links between the FDF, WSC, TDRS. Problems/discrepancies at any step could result in an off-pointing TDRS. Problems/discrepancies at any step could result in an off-pointing TDRS. 7/13/20103Jason Laing

Tracking Data Monitoring Traditionally, the TDMs have been monitored in the FDF with a text display, known as the TDRS Beam Angle (TBA) display. Traditionally, the TDMs have been monitored in the FDF with a text display, known as the TDRS Beam Angle (TBA) display. Monitors the difference between the computed angles and the observed angles of the TDRS. Monitors the difference between the computed angles and the observed angles of the TDRS. Computed: based on the nominal ephemeris, shows the angle of the antenna if it were pointing at the ideal trajectory. Computed: based on the nominal ephemeris, shows the angle of the antenna if it were pointing at the ideal trajectory. Observed: based on the tracking data messages, shows exactly where the TDRS is pointing (or where it has been commanded to point). Observed: based on the tracking data messages, shows exactly where the TDRS is pointing (or where it has been commanded to point). 7/13/20104Jason Laing

TDRSS Ephemerides TDRS BEAM ANGLES 134/19:27:22 SAT NAME ATLAS V ATLAS V SIC/VIC 3332/ /02 TDRS NAME TDRS-7 TDRS-5 SIC/VIC 1306/ /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) ELEVATION (C) AZIMUTH (O) ELEVATION (O) AZIMUTH (O-C) ELEVATION (O-C) SPATIAL BEAM (O-C) YAW (O) ROLL (O) PITCH (O) Tracking Data Messages (TDMs) Observed Angles (from TDMs) Computed Angles (from Ephem) O-C Beam Angles Spatial Beam Angles Spacecraft Ephemerides 7/13/20105Jason Laing

SN Beams Display The SN Beams display presents a graphical representation of the observed and computed angles. The SN Beams display presents a graphical representation of the observed and computed angles. Computed angles are displayed as a green beam. Computed angles are displayed as a green beam. Observed angles, from the actual TDMs, are displayed as a white beam. Observed angles, from the actual TDMs, are 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 should be pointing. Where the TDRS should be pointing. How close the orbiter is to the edge of the 3-dB beam width. How close the orbiter is to the edge of the 3-dB beam width. The general geometry of the situation. The general geometry of the situation. 7/13/20106Jason Laing

Satellite Tool Kit (STK) TDRSS Ephemerides Tracking Data Messages (TDMs) Spacecraft Ephemerides 7/13/20107Jason Laing

7/13/ Questions - Comments ? Jason Laing

7/13/ Acronyms ADGAcquisition Data Generator ADGAcquisition Data Generator AFSCNAir Force Satellite Control Network AFSCNAir Force Satellite Control Network AOAabort once around AOAabort once around ATOabort to orbit ATOabort to orbit DoDDepartment of Defense DoDDepartment of Defense ECALEast Coast abort landing ECALEast Coast abort landing EMCCEmergency Mission Control Center EMCCEmergency Mission Control Center EREastern Range EREastern Range ERBSEarth Radiation Budget Satellite ERBSEarth Radiation Budget Satellite EUVEExtreme Ultra-Violet Explorer EUVEExtreme Ultra-Violet Explorer FDFFlight Dynamics Facility FDFFlight Dynamics Facility FDOFlight Dynamics Officer FDOFlight Dynamics Officer GNGround Network GNGround Network GTDSGoddard Trajectory Determination System GTDSGoddard Trajectory Determination System HSTHubble Space Telescope HSTHubble Space Telescope JSCJohnson Space Center JSCJohnson Space Center KSCKennedy Space Center KSCKennedy Space Center MECOmain engine cutoff MECOmain engine cutoff MILMerritt Island MILMerritt Island MTDEMetric Tracking Data Evaluation MTDEMetric Tracking Data Evaluation NDNetwork Director NDNetwork Director NICNetwork Integration Center NICNetwork Integration Center NOMNetwork Operations Manager NOMNetwork Operations Manager ODorbit determination ODorbit determination OMSOrbital Maneuvering System OMSOrbital Maneuvering System PAOPublic Affairs Office PAOPublic Affairs Office PMRPacific Missile Range PMRPacific Missile Range RTLSreturn to launch site RTLSreturn to launch site SLFShuttle Landing Facility SLFShuttle Landing Facility SMMSTDN Mission Manager SMMSTDN Mission Manager SNSpace Network SNSpace Network STDNSpaceflight Tracking and Data Network STDNSpaceflight Tracking and Data Network STGTSecond TDRSS Ground Terminal STGTSecond TDRSS Ground Terminal STSSpace Transportation System STSSpace Transportation System TALtransoceanic abort landing TALtransoceanic abort landing TBATDRS Beam Angle TBATDRS Beam Angle TDRSTracking and Data Relay Satellite TDRSTracking and Data Relay Satellite TDRSSTracking and Data Relay Satellite System TDRSSTracking and Data Relay Satellite System UARSUpper Atmosphere Research Satellite UARSUpper Atmosphere Research Satellite WSCWhite Sands Complex WSCWhite Sands Complex WSGTWhite Sands Ground Terminal WSGTWhite Sands Ground Terminal WRWestern Range WRWestern Range Jason Laing