Spacecraft tracking
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SPACECRAFT TRACKING. Lucia Plank. VLBI for space applications (1). Navigation Deep space navigation Routinely done (NASA, ESA) Sensitive perpendicular to line of sight Lunar missions SELENE, Chang‘e Frame ties Optical ↔ radio frequencies Kinematic ↔ dynamic ( ephemerides )

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SPACECRAFT TRACKING

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Spacecraft tracking

SPACECRAFT TRACKING

Lucia Plank


Vlbi for space applications 1

VLBI forspaceapplications (1)

  • Navigation

    • Deepspacenavigation

      • Routinelydone (NASA, ESA)

      • Sensitive perpendiculartoline

        ofsight

    • Lunar missions

      • SELENE, Chang‘e

  • Frame ties

    • Optical ↔radiofrequencies

    • Kinematic↔dynamic (ephemerides)

  • Localties

    • Co-location in space

      • GNSS, GRASP, MicroGEM,…

VieVS User Workshop 2011


Vlbi for space applications 2

VLBI forspaceapplications (2)

  • Differential VLBI (D-VLBI)

    • Quasar – spacecraft (SC)

      • Deepspacenavigation

      • DSN, ΔDOR

      • NASA, ESA

    • SC – SC

      • multi-frequencymethod

      • same beam method

      • e.g. SELENE (JAXA)

  • Satellite VLBI

    • Chang‘e-1

    • Tracking of GNSS satellites

    • Tracking ofothersatellites

VieVS User Workshop 2011


Vlbi for space applications 3

VLBI forspaceapplications (3)

  • Technical realizationisstronglymission-dependent.

    • Differential vs. Single

    • Signal structure

    • Phase vs. Group delay

    • Receivingsystem

      But:

  • Promising recent & futuremissions

    • Betteraccuracy, smallantennas,…

  • Technical development

    • VLBI transmittersaspayload

    • twin-telescopesoffernew

      observingmodes

  • Strong requestfor inter-

    techniqueties

    • Co-location in space

    • GRASP, GNSS, Micro-GEM,…

Possibleobservingmodewith 2 twintelescopes

VieVS User Workshop 2011


Spacecraft tracking

Spacecraft Trackingwith VieVS (1)

SPACECRAFT VLBI

  • curvedwave front

  • fast movingsources

  • time ofemission t0

GEODETIC VLBI

  • plane wave front

  • stablesources

VieVS User Workshop 2011


3 experiments

Spacecraft Trackingwith VieVS (2)

3 experiments:

Same beam differential VLBI datafrom Selene providedby NAOJ Mizusawa

1

2

  • Chang‘e-1 VLBItracking in single-mode providedby SHAO & BACC

3

Tracking of GNSS satelliteswith VLBI

  • in cooperationwith V. Tornatore

VieVS User Workshop 2011


Spacecraft tracking

1. SELENE

  • differential (D-) VLBI data

  • same beam, phasedelay

  • manyeffectsarethe same forτRSTARandτVSTAR

Δτ = τRSTAR – τVSTAR

VieVS User Workshop 2011


Spacecraft tracking

D-VLBI delay model

  • Fukushima & Sekido, 2006:

  • “A VLBI delay model forradiosourcesat finite distance“

  • Light time iteration

  • Pseudo directionvector

  • Correctionterm

VieVS User Workshop 2011


Spacecraft tracking

VLBI tracking “single”

  • Observe GLONASS satelliteswith VLBI

    • Tornatore et al., 2010

    • Single source VLBI

  • Delay model:

    • Klioner, 1991 (GCRS) for GNSS

    • Fukushima & SekidoforChang‘e

  • Simulationsperformed:

    • Vie_sim

      • Parameter:

      • Partial:

    • Vie_lsm:

      • e. g. effectofmeasurementerror on estimatedposition

  • VieVS User Workshop 2011


    Spacecraft tracking

    Summary and outlook

    • Wesuccessfullyused VieVS to model delaysofspace VLBI applications; weimplemented

      • Selene same beam dataprocessing

      • Chang‘e-1 VLBI trackingdataprocessing

      • Glonass GNSS observations

    • Vie_lsm was adaptedtoestimatespacecraftpositionsandcanbeusedforsimulations

    • TO DO:

    • Verifydelay model asrealized in VieVS

    • Continueworkwith real data

    • ImplementVieVS_SCto VieVS_1d

    VieVS User Workshop 2011


    Spacecraft tracking

    THE END

    Thank You for listening!

    [email protected]

    References:

    Kikuchi et al., 2009: Pico-second accuracy VLBI of the two sub-satellites of SELENE (KAGUYA) using multi-frequency and same-beam methods, Radio Sci. 44(RS2008).

    Klioner, 1991: General relativistic model of VLBI observables. In: Carter WE (eds) Proceedings of AGU Chapman conference on geodetic VLBI: monitoring of global change. NOAA Technical Report NOS 137 NGS 49, AGU, Washington DC, pp 188-202.

    Sekido & Fukushima, 2006: A VLBI delay model for radio sources at a finite distance, J. Of Geodesy, 80:137-149, DOI 10.1007/s00190-006-0035-y.

    Tornatore et al., 2010: Planning of an Experiment for VLBI Tracking of GNSS Satellites, D. Behrend and K. D. Baver (eds), IVS2010 GM Proceedings, VLBI2010: From Vision to Reality.


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