Celestial Mechanical ExperimentCelestial Mechanical Experiment in Phobos Soil project. in Phobos Soil project.Ultra stable occilator on S/C boardUltra stable occilator on S/C board

Linkin V., Kosov A., Gotlib V., Zotov V., Korogod V., Skulachev

D., Strukov I.

IKI RAN

Scintific ImplicationScintific Implication

Phobos, Mars EfemeridsPhobos internal structureAsteroid Masses Time variability of gravitational

constantTest of General relativityConnection VLBI and dinamical

coordinats

Requirments for MesurimentsRequirments for Mesuriments

Phobos

Eccurecy:

Distance ~ 5m, Doppler velocity ~0.1mm/s,

VLBI ~ 10m (on Phobos)

S/C

Earth

D, D’, VLBI

Peculiarity of ExperimentPeculiarity of Experiment

Mmars >> Mphob >> MS/C, Dmars >> D phob

Nongravitational forses for Phobos are negligible for orbit determination.

It is possibal to integrate equation of motion during long time

VLBIVLBIVLBIVLBI

D

D

B B

resolution

VLBIVLBIVLBIVLBI不同的到达时间

原子钟

原子钟

互相关 ,信号检测

可观测 :振幅相位延迟延迟率

VLBI 结构图

VeryLongBaselineInterferometry ： ADCs 、 independent local oscillator

VeryLongBaselineInterferometry ： ADCs 、 independent local oscillator From 1960sFrom 1960s

Delta VLBI

DOR/DOD/VLBI Delay observables:

several ns

RUSSIA VLBI RUSSIA VLBI networknetwork

Deep Space VLBI Deep Space VLBI SystemSystem

SHANGHAISHANGHAI

BEIJINGBEIJING

KUNMINGKUNMING

JIVEJIVEUMQIJIVEJIVEUMQI

RUSSIA-01RUSSIA-01

VLBI CenterVLBI Center

Intelnet

Intelnet

RUSSIA-02RUSSIA-02

RUSSIA-03RUSSIA-03

FGSC VLBI FrequencyFGSC VLBI Frequency

CW: 84000MHz

tone: +/- 20MHz

1Watt

History of this ExperimentHistory of this Experiment

Project «Phobos» 1988, DAS Participants: IKI, IPM, MGU(GAISH), JPL(US), SA (Fr) Mesuriments: D,D’,Libration, VLBI

Wanted Participants for this Experiment for Phobos Soil Project

IKI, IPM, MGU (GAISH), JIVE (EU), JPL (US)