RADIO SCIENCE EXPERIMENTS OF JOINT OBSERVATION OF YH-1 AND PHOBOS-GRUNT
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RADIO SCIENCE EXPERIMENTS OF JOINT OBSERVATION OF YH-1 AND PHOBOS-GRUNT
Jinsong Ping, YH-1 VLBI team & RS teamShanghai Astronomical Observatory, CAS
Nandan Rd. 80, 200030 [email protected]
The second Moscow Solar System Symposium (2M-S3)Moons of planets, IKI, Moscow, Oct.9-14, 2011
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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
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Power Spectra of Mars Gravity ModelUsing DSN radio matrix data
GGM1
GGM2b
SHAOSolution
Mars Gravity Model fromMGS tracking data
EXAMPLE01
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Chinese VLBI Network For S/C POD Tracking
Coverage:EW34° SN18°Baseline length:1115km to 3249km
MARK5B& CVSRReceivers;S/X/Ka
EXAMPLE02
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CE-1 Tracking Data CoverageOn CLTM-s01 topography model
Planetary Gravity: Improving Lunar Gravity by CE-1 Missions
Gravity Error Spectral
CEGM is 2 times better at low orders/degrees
LP100k
SGM100h
CEGM50c
Lunar DEM is improved by ~20meter with VLBI + RR&R POD data
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MEX Open-loop RO
mexmrs_0022, mexmrs_0024,
EXAMPLE03
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EXAMPLE04 a joint bi-static radar study by SHAO and JIVE
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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:1.YH-1 will explore Martian space environment by in situ measurement
and occultation with Phobos-Soil. A free-fly orbiter…2.Two-point measurement will provide deep inside view of Martian space
environment.3.Only 1-way open-loop tracking and OD for YH-1 S/C
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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
4 To explore the Martian gravity field near equator - VLBI
3 To have a moderate survey of Martian surface topography and sandstorms
– Visible light camera
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Main Technical Specification
Mass ~110kg
Body size 750mm×750mm×600mm
Power on orbit operation
Long term : 150WShort term : 200W
Orbit
Type : ellipse orbitInclination : 23 ~ 25°Apoapsis : 400 ~ 1000kmPeriapsis : 74000 ~ 80000km
Attitude control Zero momentum three axis stabilization
Electrical powerRegulated busSolar array, 4.674m2 ,triple junction GaAs cells Lithium ion batteries 30AH
TT&C X band , CCSDS standard
On-board computer 31750CPU
Thermal control Passive control
Reliability 0.65 ( EOL)Lifetime 1a
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Introduction of the YH-1 mission situation
Testing in 2008 & 2010:
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craning for measurement center of gravity vibration test
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Joint Russa-China Martion Missions:Phobos-Grunt & Yinghuo-1 (YH-1) after Zelenyi , this session
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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.
MARS
Orbiter
Phobos (Lander)
VLBI-2VLBI-1
1-way Doppler and D-VLBI only are used for OD and POD of YH-1 X-band 8.4GHz CWs are used.
Earth Atm & Iono
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Simple & Easy
•Onboard USO/clock is stable enough;•Advanced Software Radio Tech;•Save transferring time and resource
Open Loop Tracking follow DLR-LP-1998
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USO StabilityFor 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
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VLBI/CAS is powerful for deepspace S/C open-loop OD
MEX OD ability test by new developed RSR of CVN4ch, VLBI recording, RSR, Doppler & Phase retrieving
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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 andlow order/degree gravity for Marsand Phobos will be expected to be estimated and improved by the joint missions
Mars gravity variation:
Follow Konopliv, JPL/NASA
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Working mode of bi-static radar to study Martian and Phobos surface characteristics
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a
asym ptotes
r0
Earth
S /C
a
vE
vS
Venus (r)
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
Doppler Freq
Reflection and Altitude
S/C-Planet-SiteInformation
Abel Transfer
Atm. Model
Electron Profile Atm. Density Profile
Atm. Pressure Proflie
Temperture Proflie
大气组成
静流体平衡
状态方程
行星大气无线电掩星观测数据解析流程框图
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VLBI Experiment Objectivesin YH-1 & Phobos-Grunt mission
•To do OD and POD for YH-1 mission;
•To define more exactly Sun system’s parameters (Astronomical constant like GM and others, orbital parameters of Mars and Fobos);
•To study the Martian ionosphere using RS method;
•To study the Martian surface using bi-static radar method;
•To define more exactly limits of variation of universal gravitational constant;
•To define more exactly geometrical tie of dynamical coordinate system having original in Sun system mass centre of with coordinate system based on quasar angular coordinate measurements.
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Also, following information of Phobos will be recovered
by this joint mission:1 ) Density by combining MEX figure with GM
2) Inner structure…ice or empty ?
3) 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.)
4) Orbit & Orbit evolution
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Thank you