slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission PowerPoint Presentation
Download Presentation
Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission

Loading in 2 Seconds...

play fullscreen
1 / 18

Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission - PowerPoint PPT Presentation


  • 153 Views
  • Uploaded on

Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission. Particles and Fields Operations Critical Design Review May 23 -25, 2011 Dave Mitchell SWEA Lead. The Particles and Fields Package. LPW- EUV. SWIA. LPW. SWEA. MAG. SEP (sunward FOV not shown). MAG. STATIC.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission' - gray-shields


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission

Particles and Fields Operations

Critical Design Review

May 23 -25, 2011

Dave Mitchell SWEA Lead

the particles and fields package
The Particles and Fields Package

LPW- EUV

SWIA

LPW

SWEA

MAG

SEP

(sunward FOV not shown)

MAG

STATIC

Solar Wind Ion Analyzer (SWIA) - SSL

Solar Wind Electron Analyzer (SWEA) – CESR / SSL

Langmuir Probe and Waves (LPW) – LASP / SSL

Plus Extreme Ultra-Violet (LPW-EUV) - LASP

Solar Energetic Particle Detector (SEP) - SSL

Magnetometer (MAG) – GSFC

Supra-Thermal and Thermal Ion Composition (STATIC) - SSL

app instruments
APP Instruments

+i is in the NGIMS Boresight Direction

+j is in the main IUVS Boresight Direction

+k defined to be a right-handed coordinate system

Inner Gimbal

SC +y

Outer Gimbal

i

k

  • Inner gimbal rotates about spacecraft body y axis
  • Outer gimbal rotates about APP j axis

STATIC

j

science phase day in the life
Science Phase: Day in the Life

LPW-EUV occultations

coverage of the mars environment
Coverage of the Mars Environment

Periapsis Pass

1000

sheath

600

pileup

ionosphere

300

exobase

deep dip

homopause

100

120

130

140

150

Minutes

S/C Slew

spacecraft pointing modes
Spacecraft Pointing Modes

Periapsis Modes

Sun-Velocity

+Z  Sun; +X  Nadir

Fly-Y

+/- Y  Ram; +X  Nadir

Aerostable

-Z  Ram; +X  Nadir

Side Segment Modes

Sun-Nadir (STATIC-Priority)

+Z  Sun; +X  Nadir

Sun-Inertial (IUVS-Priority)

+Z  Sun; +X  Semi-minor axis

Apoapsis Mode

Sun-Inertial

+Z  Sun; +X  Semi-major axis

Z

Y

X

app pointing modes static
APP Pointing Modes (STATIC)

Side Segments

Periapsis Segments

Sun

Ram

RAM-NADIR

SUN-NADIR

90O X 360O FOV

Nadir

Nadir

Ram

180°

STATIC Scans

RAM-HORIZONTAL

(Fly-Y Only)

Nadir

science orbit scenarios
Science Orbit Scenarios

From Design Reference Mission (MAVEN-SC-PLAN-0005)

No STATIC Sun-Nadir

impact of orbit scenarios on pfp
Impact of Orbit Scenarios on PFP
  • STATIC
    • Periapsis: Significant improvement since PDR (ram-nadir and ram-horizontal observations, APP scan every other orbit)
    • Mid-altitudes: Time sharing with IUVS, minimize use of scenarios 4 and 5 (CCR in system to reduce these from 14 weeks to ~2 weeks)
    • Apoapsis: Ride-along during IUVS disk mapping (same as PDR)
  • SWEA
    • Periapsis: high energy resolution not available in Fly-Y mode (~50% of orbits)  still meets Level 3 requirements
    • No issues at higher altitudes.
  • SWIA, SEP, MAG, LPW/EUV
    • No issues.
pf instrument operations
PF Instrument Operations

S/C Attitude

Inertial Point

Inertial Point

Sun-V Fly-Y

slew

slew

slew

slew

APP Mode

Sun-Nadir (STATIC priority)

Sun-Nadir (STATIC priority)

RAM-N RAM-H

Fixed

Fixed

M

M

H

L

L

LPW EUV

Solar Monitor

M

M

H

L

SEP

L

MAG

H

L

L

SWIA

Solar Wind and Magnetosheath Modes (internally triggered)

Iono Mode

SWEA

Solar Wind Mode

Solar Wind Mode

STATIC

C

C

Pickup Ions & Magnetosheath

RAM

Pickup Ions & Magnetosheath

5600

6200

500

500

5600

Spacecraft Altitude (km)

0

45

90

135

180

225

270

Time Since Apoapsis (min)

Key: H/M/L = high/medium/low data rates; C = ion conics and outflow

Standard Orbit

Sun/Nadir Point

Sun/Nadir Point

pf instrument operations1
PF Instrument Operations

Deep Dip Orbit

S/C Attitude

Inertial Point

Sun/Nadir Point

Sun/Nadir Point

Inertial Point

RAM

slew

slew

slew

slew

APP Mode

Sun-Nadir (STATIC priority)

Sun-Nadir (STATIC priority)

RAM Track

Fixed

Fixed

M

M

H

L

L

LPW EUV

Solar Monitor

M

M

H

L

SEP

L

MAG

H

L

L

SWIA

HV Off

Solar Wind / Magnetosheath Modes

Solar Wind / Magnetosheath Modes

SWEA

HV Off

Solar Wind Mode

Solar Wind Mode

STATIC

Pickup Ions & Magnetosheath

HV Off

C

Pickup Ions & Magnetosheath

C

5600

6200

500

500

5600

Spacecraft Altitude (km)

0

45

90

135

180

225

270

Time Since Apoapsis (min)

Key: H/M/L = high/medium/low data rates; C = ion conics and outflow, HV Off at pressure > 10-5 torr

pf commanding
PF Commanding

The SOC generates routine command scripts to run the PF instruments based on parameterized inputs from the PF team

orbit phased mode changes

altitude based rules

eclipse based rules

spacecraft orientation based rules

instrument safing commands

high voltage off during deep dips

close SEP attenuator when Sun in FOV

close EUV shutter when viewing the RAM direction at periapsis

The PF team generates non-interactive commands and sends to the SOC for upload

Regular commands to select Archive data for downlink

Occasional parameter change commands to adjust the instruments

pf archive data
PF Archive Data
  • PF instruments (except LPW) send uncompressed data to the PFDPU
    • Compression in PFDPU reduces this volume by factor of ~2
    • Standard data products  Survey Data
    • High resolution data products  Archive Data
  • Archive data
    • Stored in 8 GB flash memory within PFDPU
    • At ~30 kbps, memory can hold 2-3 weeks of Archive Data
    • About 10% of Archive data can be sent down in telemetry
  • Downlinks occur twice per week
    • Survey data (Quicklook) are reviewed after each downlink
    • Time ranges of interest are selected
    • Commands are generated to instruct PFDPU to place selected Archive data into telemetry at next available downlink
    • Commands sent to SOC for upload