STK SOLIS

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SOLIS provides a complete spacecraft simulation environment in STK.With SOLIS, developed by Advanced Solutions, Inc. (ASI), mission design engineers can:

• Configurespacecraftcomponentsincluding the sensor, actuator, power, communications, and payload models.

• Rapidlyevaluatesystemtrade-offsandensurethatspacecraftcapabilitiesandconstraintsareconsideredearlyinthelifecycle and are being maintained.

• Createandsavespacecrafttemplatesofoptimalconfigurationsforrapidassessmentofchanges.

• Automatically generate a validated attitude determination and control system configurationtargetedforflightavionics.

• Emulateflightsoftwareusingmissionsequence modeling, real-time commanding, and telemetry.

These capabilities are enabled by the SOLIS architecture, which embeds a desktop versionofASI’son-boardflightsoftware.Thismodularflightsoftwarearchitectureprovidesrapidspacecraftdevelopment,assembly,testand integration. It also provides autonomous on-board operations and enhances integrationandtestwithitshigh-fidelity“testlikeyoufly”capabilities.

Capabilities

Attitude disturbance modeling • Magnetic dipole torque

• Gravity gradient torque

• Solarpressureforceandtorque

• Aerodynamicpressureforceandtorque

Attitude determination modeling

• Sun vector sensors, sun angle sensors, horizon sensors, rate sensors, magnetometers, star trackers

• Perfectattitudedetermination,fixed-gainfilter,Kalmanfilter

Attitude control modeling • Reaction wheels,

magnetic torquers, thrusters

• Custom controllers

• Perfectcontrol,PIDcontrol, phase-plane control

Mode control / guidance• Orbit determination, ephemeris

propagation

• User-definedmodes

• Idle,RateDamp,Hold,SunAcq,Tracking

• Referenceobjects:InertialFixed,SC->Sun,SC->Nadir(detic/centric),SCVelocity,SCMagField,SC->TgtObject,cross(SC->TgtObject,SCVel),TrueNorth,TrueNorth@Tgt,TgtVelocity

• EigenSlew and RendezSlew

Power/thermal modeling• Distance-dependentsolarflux,centralbodyinfrared,albedo

• Finite element thermal. Absorptivity, emissivity, conductivity, shunt

• Solarpanelsize,efficiency,articulation,temperature dependency

• Batterycapacity,charge/ discharge regulation

• Dynamic spacecraft loads. Payload power, communications system power, reaction wheel power

• Payload/communications/datamodeling

• Off,On,Standby

• Define multiple payload modes. Power consumption, data collection

• Transmitters, receivers, transceivers.Datarates, overhead, power consumption

• Datarecordersize,currentstate

• Command/telemetryavailabilitywhenground stations are visible

Target planning The Target Planner enables you to rapidly generate mission sequences to carry out targetingoperations.AspartofafullyintegratedspacecraftmodelinSTK,theTargetPlannerincorporatesactualspacecraftalgorithms and dynamics to determine an optimal targeting plan. This ensures that only real and accurate constraints are used to develop your operations. The Target Planner istightlyintegratedwithSTKaccesstoprovide various target constraints.

STK SOLIS

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Spacecraft design applicationsWhendesigningaspacecraft,SOLIS can help you:

• Designmissionrequirements.

• Analyze various system concepts to determine which can meet mission requirements.

• Analyzeandrefineconceptualdesigns.

• Verifythefinaldesignofsubsystemmodelsand components.

• Provide independent validation and sensitivity/marginanalysis.

Spacecraft operationsSOLIS can be used as a training and analysistoolforgroundoperatorsandmission analysts.

Reporting and visualization of end-to-end spacecraft simulationAsthesatelliterunsthroughthesimulationofoperator commands, you can track it in the followingways:

• Analysis graphs.Forexample,adynamicgraphcanshowwhenthespacecraftstarts to rotate around until its solar panels facethesunandwhenthepanelsstarttogenerate power.

• Spacecraft status summary. Provides informationaboutthecurrentstateofthespacecraft,includingspacecraftmode,attitude data, power system state, and payload/communicationsystemstatus.

• 2D and 3D graphics windows. Provides a visualizationofthespacecraftoperations,including attitude and orbit properties.

Custom development • Generatesframeworkcodebasedonuser-definedXMLdescription

• Builds custom dlls that integrate with SOLIS

• Enablesdevelopmentofcustomcomponents and algorithms