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Mars Odyssey PSG
Mission Status
Gaylon W. McSmith
Robert A. Mase
June 9, 2003
Mars Odyssey
Mission Status
Spacecraft operations are nominal
All Science payload suites are collecting data in a nominal fashion
April 7, 2003 marked the 2-year anniversary of Odyssey launch
On this date, we completed our 5000th mapping orbit
Mission Statistics (May 2003):
• Day 443 of the 917-day science mission (48% complete)
• Day 338 since GRS Boom Deploy (49% of one Mars-year)
• Total # Mapping Orbits: 5380 (6196 since MOI)
• 761 days past Launch (61% of mission complete)
• Launch: April 7, 2001
End of Primary Mission: August 24, 2004
Science Data Return:
• Total Science Data Returned to Date: ~155 Gbytes
• Planned Data Volume for 917-day Science Mission: 126.5 Gbytes
• DSN allocations better than planned, operations enhancements
Mars Odyssey
Propellant Budget
Total Fuel in the Tanks (Feb 2002):
Unusable
Total Fuel Available for Mapping (Feb 19, 2002):
Contingency
Safe Mode
Momentum Mgmt
Orbit Maintenance
Extended Science
PQ Orbit Raise
Unallocated
Total
Allocation*
8.2 kg
5.0 kg
11.5 kg
3.7 kg
1.9 kg
3.4 kg
10.1 kg
43.8 kg
Expected
Usage to Date
2.6 kg
1.6 kg
3.7 kg
1.2 kg
9.1 kg
Total Usable Propellant Remaining:
* Allocations for 1374-day mission
46.2 kg ± 3 kg
2.4 kg
43.8 kg
Actual Usage
(1 May 2003)
0.0 kg
0.2 kg
2.0 kg
0.0 kg
0.0 kg
0.0 kg
0.0 kg
2.2 kg
41.6 kg ± 3 kg
Mars Odyssey
Recent Spacecraft Activity
Recent Spacecraft Activity
Jan-Apr:
Jan 7:
Jan 15:
Jan 24:
Jan 27:
Feb 4:
Feb 4:
Feb 13:
Feb 22:
Apr 7:
Apr 10:
Apr 28:
Executed 14 NSP Demo Passes (18 Scheduled)
Activated the MARIE auto-download/erase block
Increased THEMIS APID30 packet buffer allocation
Uplinked Safe-Mode emergency desat parameters
Multi-Spacecraft DDOR demo pass (w/ MGS)
Solar Array gimbal cycle and reposition
110 kbps data rate at 70m stations
Updated DPT for small-packet issue
Multi-Spacecraft DDOR demo pass (w/ MGS)
Completed 5000th Mapping Orbit
Demonstration of 124 kbps data rate
Solar Array gimbal cycle
Mars Odyssey
Plans for Next Quarter
Plans for the next 3 months
• Continue UHF relay capability development and testing
• UHF testing with MER test-set at LMA (May 5-9)
• Complete UHF Stanford test plans
• Execute tests in June - Sep 2003
• Continue OTM planning for Sun-synchronous maneuver (Oct 2003)
• Plan for Demo tracks to prepare for Asset Contention Period (ACP)
• DEMOs with Parkes and New Norcia
• Arraying in an MSPA configuration
• 2-MSPA with uplink swaps
• Continue DDOR campaign to support MER (thru Nov 2003)
• Study phasing ODY orbit to support MER SOL-1 overflight
Mars Odyssey
Schedule
2003
Activity Name
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sept
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sept
Oct
Nov
Dec
Odyssey PSG
Quart erly Management Review
NSP Proj ect Int erface Demo
Update Project Risk List
UHF Block
Dev elopment /Testing
MER STE in Denv er f or Testing
with ODY STL
ODY UHF Test (with Stanford)
UHF ORT Testing
(wit h MER & Beagle2)
Propulsiv e Maneuv er (OTM)
DSN Capability Demos
(Arr ay, MSPA, Alternate Assets)
DDOR Campaign (MER support)
Beagl e 2 UHF Relay Support
MER- A UHF Relay Support
MER- B UHF Relay Support
Mars Odyssey
Network Simplification Project (NSP)
•
Transition to NSP is complete
• All stations are now transitioned to NSP or down for NSP upgrade
•
During Feb - April, up to 4 of 10 stations were down at once for upgrade
• ODY had less tracking, more MSPA than usual
• ODY impacted by stations not returning to service on schedule
• And by changing DEMO tracks
•
Future Capability Upgrades that will impact Odyssey
• All will require ODY demonstration tracks in the fall to prepare for the
Asset Contention Period (ACP)
• 2-MSPA with multiple uplink swaps
• Array capability with MSPA
• Alternate Assets - in case of spacecraft emergency during ACP
• Parkes and New Norcia, both in Australia
Mars Odyssey
UHF System Test with Stanford
•
•
•
•
Program desire to characterize ODY UHF system
• Discovered 6dB (forward) and 2dB (return) losses in cruise tests
• Can still meet MER requirements if system has not degraded
further
• Avoid last-minute surprises, time to re-plan if negative result
Major challenges have been addressed
• Instrument FOV constraints
Test in three phases
• Power-on test - does not involve Stanford - early June (completed)
• Nadir-point test (no attitude change) - late June
• Earth-point test - mid-August
Project continues to work implementation details
• Scope/goals of each test
• Test timeline and scheduling of Stanford antenna
• Identification of backup opportunities
Mars Odyssey
UHF System Test with Stanford
Likely Scenario for Earth-point test
•
•
•
•
Test tentatively scheduled for ~ 25 Aug 2003
Would perform one activity to point UHF at Earth
• Accommodates all S/C and instrument FOV constraints throughout
• ~10 minute slew to Earth-point attitude
• Dwell at Earth-point for ~20 minutes
• ~15 minute dogleg-slew to return to nadir-point
• Dogleg to avoid Mars in GRS cooler FOV during slew
Would dedicate an orbit to this activity
• May possibly be repeated a few days later
Will identify backup opportunity to perform test again a few weeks later
• Only re-test if necessary
Mars Odyssey
OTM for Extended Mission
Plan for the Extended Mission:
•
Perform an inclination-change maneuver to change the LST drift
•
Propellant Budget Allocation: 1.9 kg (~10 m/s of DV)
Design Constraints:
•
Sun-synch at the earliest LMST that would provide a solar beta angle
< -52.5˚ with 1.5˚ margin
•
Margin analysis performed by ACS (D. Shafter)
•
Any change/perturbation in orbit drift can be trended and
accommodated by an OTM in the future if necessary
•
To maintain Solar Beta Angle < -54.0˚ -> OTM ~Sept 23, 2003
Implementation
•
Flight team has gone through one iteration of OTM design
•
Attitude very close to nadir-point attitude
•
Issue: Telecom during the burn
•
If required: attitude change would negatively impact GRS
Mars Odyssey
5 PM Sun-Synchronous Orbit
All dates approximate
Mars Odyssey
MER and Beagle2 UHF Relay
Landing Dates
•
Beagle2:
•
MER-A:
•
MER-B:
Dec 25, 2003
Jan 4, 2004
Jan 25, 2004
Impacts to Odyssey
•
MER requested ODY orbit phasing to cover post-EDL deployments
•
Assessing ability to predict/control orbit phasing
•
Would likely alter the ground track repeat cycle
•
UHF relay data requires change to packet buffer allocations
•
Possibly in 2 stages, prior to relay, just prior to MER-B
•
DSN allocations actually improve
•
Nearly continuous downlink
•
Lots of MSPA, sharing of uplink within a pass
Backup Slides
UHF Relay
Packet Buffer Allocations
Mars Odyssey
Onboard Memory Allocations (Apr 2002)
•
Old Onboard Configuration (April 2002)
Odyssey On-board Memory Allocations
Code
18 MB
File System
10 MB
THEMIS Scratch
40 MB
THEMIS
GRS
MARIE
ODY Science
40 MB
Attitude Recon
ODY Health + Sys Margin
7.5 MB
THEMIS Engr
5
MARIE/GRS Engr
Total
40
Odyssey On-board Memory Allocations
Code
18 MB
File System
10 MB
THEMIS Scratch
40 MB
THEMIS
GRS
MARIE
1 MB
12.5 MB
4 MB
ODY Science
22.5 MB
Attitude Recon
7.5 MB
THEMIS Engr
5
MARIE/GRS Engr
Total
22.5
Relay
•
MB
includes margin
Original Proposal (April 2002)
ODY Health + Sys Margin
Relay
•
12.5 MB
128 MB
Instr. Internal Memory
1 GB (MMC)
0 MB
80 MB
1 MB
30 MB
4 MB
30 MB
128 MB
Instr. Internal Memory
1 GB (MMC)
0 MB
80 MB
MB
includes margin
Change GRS allocation from 30 MB to 12.5 MB allowed for 15 hours of data
collection on-board Odyssey (assuming 1500 b/s collection with 30% margin)
Mars Odyssey
Onboard Memory Allocations (Current)
•
Current Onboard Configuration
Odyssey On-board Memory Allocations
Code
18 MB
File System
10 MB
THEMIS Scratch
40 MB
ODY Science
47.1 MB
ODY Health + Sys Margin
7.5 MB
Relay
0 MB
122.6 MB
THEMIS
3.3
GRS
30
MARIE
8.8
Attitude Recon
5
THEMIS Engr
MARIE/GRS Engr
Total 47.1
• Current On Board
Configuration
•
•
MB
includes margin
Proposed (New)
Odyssey On-board Memory Allocations
Code
18 MB
File System
10 MB
THEMIS Scratch
40 MB
ODY Science
20.5 MB
ODY Health + Sys Margin
7.5 MB
Relay
32.5 MB
128.5 MB
•
Instr. Internal Memory
1 GB (MMC)
0 MB
80 MB
MB
MB
MB
THEMIS
2.6
GRS
8.5
MARIE
4.4
Attitude Recon
5
THEMIS Engr
MARIE/GRS Engr
Total 20.5
MB
MB
MB
Instr. Internal Memory
1 GB (MMC)
0 MB
80 MB
MB
includes margin
Change GRS allocation from 30 MB to 8.5 MB allows for 12 hours of
data collection on-board Odyssey (assuming 1500 b/s collection with
10% margin)
Current average data rate of 990 bps equivalent to ~18 hours on board
Mars Odyssey
Packet Buffer Changes
•
THEMIS Change from Original Baseline
– Packet buffer allocation increased at the beginning of mapping due to 2 min. data
latency issue
– Current allocation of 1500 packets (3.3 Mbytes) supports 110 kbps or 124 kbps
– Reduction to 1200 packets (2.6 Mbytes) supports 110 kbps
•
MARIE Change from Baseline
– MARIE Changed from 40 file equivalent (2000 packets, 4.4 Mbytes) to 80 file
equivalent (4000 packets, 8.8 Mbytes)
– Reduction in Frequency of MARIE Mode Changes Desired
– Auto-Download Block Supports 80 file equivalent packet buffer
– New 40 file Auto-Download Block Required
•
MER/Beagle Packet Buffer Allocation (32.5 Mbytes Proposed)
– 15 MBytes per MER supports 120 Mbits per pass (6820 packets)
– 2.3 Mbytes for Beagle-2 supports 18.8 Mbits per pass (1050 packets)
Mars Odyssey
2005 Average
Daily
Tracking
2005 - Odyssey
Tracking
Hours per DayPass
24
20
16
12
8
4
1
0