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RADIO SCIENCE EXPERIMENTS OF JOINT OBSERVATION OF YH-1 AND PHOBOS-GRUNT

The second Moscow Solar System Symposium (2M-S 3 ) Moons of planets, IKI, Moscow, Oct.9-14, 2011. RADIO SCIENCE EXPERIMENTS OF JOINT OBSERVATION OF YH-1 AND PHOBOS-GRUNT. Jinsong Ping, YH-1 VLBI team & RS team Shanghai Astronomical Observatory, CAS Nandan Rd. 80, 200030 Shanghai

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RADIO SCIENCE EXPERIMENTS OF JOINT OBSERVATION OF YH-1 AND PHOBOS-GRUNT

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  1. The second Moscow Solar System Symposium (2M-S3) Moons of planets, IKI, Moscow, Oct.9-14, 2011 RADIO SCIENCE EXPERIMENTS OF JOINT OBSERVATION OF YH-1 AND PHOBOS-GRUNT Jinsong Ping, YH-1 VLBI team & RS team Shanghai Astronomical Observatory, CAS Nandan Rd. 80, 200030 Shanghai pjs@shao.ac.cn

  2. Df. Planetary Radio Science (RS) Science to investigate planetary atmosphere and ionosphere, gravity, mass(GM), ring, ephemeris, solar wind, comets, gravitational wave and red shift…mainly by measuring the change of phase , amplitude, polarization of the radio signal from S/C to ground station, which includes: • Mass and gravity of planets and the moons； • Atmosphere: pressure, temperature, contents； • Ionosphere: electron density, corona, interplanetary media； • Testing experiments of general relativity; • Orbit and rotation of the planets and moons； • Unification of celestial reference frames; • Planetary surface by bi-static radar mode. Ref: Gavrik; Duev; Rosenblatt; Smirnov; Kosov; this meeting

  3. EXAMPLE01 Mars Gravity Model from MGS tracking data GGM2b Power Spectra of Mars Gravity Model Using DSN radio matrix data SHAO Solution GGM1

  4. EXAMPLE02 Chinese VLBI Network For S/C POD Tracking MARK5B & CVSR Receivers; S/X/Ka Coverage: EW34° SN18° Baseline length: 1115km to 3249km

  5. Planetary Gravity: Improving Lunar Gravity by CE-1 Missions CE-1 Tracking Data Coverage On CLTM-s01 topography model Lunar DEM is improved by ~20meter with VLBI + RR&R POD data LP100k SGM100h Gravity Error Spectral CEGM is 2 times better at low orders/degrees CEGM50c

  6. MEX Open-loop RO mexmrs_0022, mexmrs_0024, EXAMPLE03

  7. EXAMPLE04 a joint bi-static radar study by SHAO and JIVE

  8. Applications RS in Chinese Martian exploration project YH-1 • YH-1 will be YH-1 will be launched with Phobos-soil in November, 2011 • Mission: • YH-1 will explore Martian space environment by in situ measurement and occultation with Phobos-Soil. A free-fly orbiter… • Two-point measurement will provide deep inside view of Martian space environment. • Only 1-way open-loop tracking and OD for YH-1 S/C

  9. Scientific Objectives • 1 To study in details of Martian space magnetoshpere, ionosphere and the plasma distribution and its variations • - FGM, Plasma package, UHF receiver • 2 To study Martian ions escape mechanism • - Plasma package 3 To have a moderate survey of Martian surface topography and sandstorms – Visible light camera 4 To explore the Martian gravity field near equator - VLBI

  10. Introduction of the YH-1 mission situation Testing in 2008 & 2010:

  11. craning for measurement center of gravity vibration test

  12. Joint Russa-China Martion Missions: Phobos-Grunt & Yinghuo-1 (YH-1) after Zelenyi , this session

  13. 1-way Doppler and D-VLBI only are used for OD and POD of YH-1 X-band 8.4GHz CWs are used. YH-1 &PGSC same beam VLBI observation to cancel Earth atm&iono effects, will success the single S/C RS observation in the joint missions. Orbiter Phobos (Lander) MARS Earth Atm & Iono VLBI-1 VLBI-2

  14. Open Loop Tracking follow DLR-LP-1998 Simple & Easy • Onboard USO/clock is stable enough; • Advanced Software Radio Tech; • Save transferring time and resource

  15. USO Stability For FGSC & YH-1 YH-1 is using a pair of USOs with long-term stability of 7x10E-11, may be improved by 1 order; 1x10E-12 for short term stability, same as FGSC

  16. MEX OD ability test by new developed RSR of CVN4ch, VLBI recording, RSR, Doppler & Phase retrieving VLBI/CAS is powerful for deepspace S/C open-loop OD

  17. 北京中心火星探测定器轨软件研制进展及精度初步分析北京中心火星探测定器轨软件研制进展及精度初步分析 Based on OD and POD, the GM and low order/degree gravity for Mars and Phobos will be expected to be estimated and improved by the joint missions Mars gravity variation: Follow Konopliv, JPL/NASA

  18. Working mode of bi-static radar to study Martian and Phobos surface characteristics

  19. Planetary RO in Phobos-Grunt & YH-1 missions is possible to observe the day time and night time profiles of atm/iono at low latitude

  20. Also, following information of Phobos will be recovered by this joint mission: 1） Density by combining MEX figure with GM Inner structure…ice or empty ? Rotation/liberation (Main liberation with possible periods of ~24.6h, 12.3h, 7.55h, 3.78h, 184.3h, 92.2h, 38.2h, 19.1h need to measure.) Orbit & Orbit evolution

  21. Thank you

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