envisat spacecraft and flight operations segment status
DESCRIPTION
ENVISAT Spacecraft and Flight Operations Segment Status. Andreas Rudolph Mission Operations Department ESOC / ESA. Presentation Overview. Spacecraft and Instrument Operations Summary since the Calibration Review Platform Status and Performances - PowerPoint PPT PresentationTRANSCRIPT
Page 1ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
ENVISAT Spacecraft and Flight Operations Segment
StatusAndreas Rudolph
Mission Operations DepartmentESOC / ESA
Page 2ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Presentation Overview Spacecraft and Instrument Operations Summary
since the Calibration Review Platform Status and Performances Flight Operations Segment Status and Performance Organisation at FOS and its Interfaces for Routine
Phase Conclusions
Page 3ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Spacecraft Operations Summary First routine Out-of-plane manoeuvre for inclination
correction performed in Sep-02 – combined with first attempt for activation of the P/L Module Computer software V38p1
Leonid meteor storm protection operations carried out on 18 & 19-Nov – satellite & instrument brought to lower mode of operations as a precaution for the meteor storm
Successful uplink of the PMC Flight Software version 38 p1 (including a new list of patches) as part of Leonid ops. V38p1 includes a proper memory scrubbing function and fixes
to all major problems encountered since launch (PLSOL problems, etc).
Page 4ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
P/L Module Availability
77.1% 81.0%
99.2% 100.0%92.3%
100.0%94.0%
0.00%
10.00%
20.00%
30.00%
40.00%
50.00%
60.00%
70.00%
80.00%
90.00%
100.00%
May June July August September October November
ENVISAT PLM PLANNED & UNPLANNED AVAILABILITY 2002
Page 5ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Instrument Operations Summary
The instrument operations since the calibration review went well overall
Several corrective patches have been applied successfully to ASAR (e.g. TR parity switch-downs in Wave mode, product
annotation error in Alternating Polarisation mode, …) DORIS/MWR (ICU counter overflow) SCIAMACHY (MCMD reception error, PMTC sign error)
The MIPAS sterling cooler vibration cancellation system has been disabled (without any significant performance degradation) to prevent unnecessary transitions to Refuse mode
Page 6ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Instrument Operations Summary - contd
For ASAR the activation of the last background mode, Global Monitoring, in Nov-2002 is causing occasional Refuse mode entries (spurious TR parity error detection) – a corrective patch for this problem is under development
For MERIS a few of the recent radiometric calibrations of Diffuser 1 have been lost due to a known ICU timing problem – a workaround / corrective patch is under discussion
The instruments have provided a high operational availability since the cal review
Page 7ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Instrument Availability May – Nov-2002 ENVISAT AATSR, ASAR, GOMOS & MERIS
INSTRUMENT AVAILABILITY 2002 - UNPLANNED
0.0%
10.0%
20.0%
30.0%
40.0%
50.0%
60.0%
70.0%
80.0%
90.0%
100.0%
May
June Ju
ly
Augus
t
Septe
mbe
r
Octob
er
Novem
ber
PE
RC
EN
T A
VA
ILA
BL
E
AATSR
ASAR
GOMOS
MERIS
Page 8ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Instrument Availability May – Nov-2002 – contd.
ENVISAT MIPAS, MWR, DORIS, RA-2 & SCIA INSTRUMENT AVAILABILITY 2002 - UNPLANNED
0.0%
10.0%
20.0%
30.0%
40.0%
50.0%
60.0%
70.0%
80.0%
90.0%
100.0%
May
June Ju
ly
Augus
t
Septe
mbe
r
Octob
er
Novem
ber
PE
RC
EN
T A
VA
ILA
BL
E
MIPAS
MWR
DORIS
RA-2
SCIA
Page 9ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Satellite Operations Outlook
On 17-Dec-2002 the next Out-Of-Plane manoeuvre is required for inclination control – this will lead to a short unavailability of the payload for nominal operations
Commissioning of the Artemis Ka-band link is planned for Mar-2003 following injection of Artemis to the Geo-stationary orbit. The planning and testing of this last satellite commissioning activity is in progress.
Page 10ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Platform Status and Performance
The performance of the Service Module has been excellent with 100% availability
All units are configured to the A-chain and perform nominally
The cat bed heaters are kept on permanently (without any degradation observed) to keep Hydrazine temperatures above 2 deg C – see FCV heater mat failure reported during the cal review
Page 11ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Service Module Single Event Upsets
0
400
800
1200
1600
2000
2002.060.00.43.19.049 2002.115.21.42.21.768 2002.179.08.17.42.459 2002.244.10.53.26.146 2002.309.21.45.45.836
SE
U C
ou
nte
r
Page 12ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Power Subsystem
210
220
230
240
250
2002
-064
11.
31.5
0.02
2002
-086
03.
25.2
8.90
2002
-111
00.
25.1
2.74
2002
-135
13.
37.4
3.68
2002
-162
17.
05.2
1.53
2002
-190
20.
45.3
7.40
2002
-219
18.
52.1
7.26
2002
-249
01.
28.1
7.08
2002
-278
01.
16.5
2.98
2002
-307
04.
29.4
0.84
2002
-336
04.
18.2
8.71
Am
p
6900
7000
7100
7200
7300
7400
Wa
tt
Predicted SA output Poly. (Actual SA output)
Solar array output shows good performance
The average battery DOD level is varying between 10% to 15% with the current instrument operations profile
Page 13ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Satellite Thermal Evolution - Batteries
-6
-5
-4
-3
-2
-1
0
1
2002-25617.49.55.08
2002-26511.31.47.04
2002-27405.08.51.00
2002-28219.12.02.96
2002-29111.16.34.92
2002-30006.36.18.88
2002-30900.01.54.84
2002-31719.12.34.79
2002-32606.19.46.76
De
gC
Min Battery Temperature Max Battery Temperature
Heating ON
ASAR in Heater
ASAR in Heater
Leonids PLM switch down
Page 14ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Satellite Attitude Control
The pointing of the satellite is very stable as already reported during the cal review
The AOCS H/W (gyros, star trackers, reaction wheels and magnetorquers) used in Stellar Modes work very wellSatellite
Axis Max Depointing
DOY 334-328 MERIS [ASAR]
Estimated Mispointings SPEC
X-axis 25 mdeg 20 mdeg [15 mdeg]
42 mdeg
Y-axis 20 mdeg 25 mdeg 42 mdeg Z-axis 15 mdeg 25 mdeg
[9 mdeg] 42 mdeg
Page 15ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Satellite Orbit Control Manoeuvres
Orbit control manoeuvres for +/- 1 km ground track control will be required throughout the mission: Out-Of-Plane Manoeuvres (OCMs) for inclination control:
approx. 3-4 / year - approx. 5 m/sec of V = approx. 23 kg Hydrazine
Fine Control Manoeuvres (SFCMs) for altitude control: one every 3 weeks - approx. 4 cm/sec of V per SFCM = approx. 3.6 kg / year
Number of SFCM’s will decrease until 2005/2006 and then rise again (solar cycle)
Hydrazine consumption: 37.2 out of 314 kg have been used to date No thruster controlled attitude acquisition modes or safe
mode entered since end of LEOP
Page 16ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Telemetry System
Telecommand System
S/C TM/TC Database
Flight Dynamics System
Mission Planning System
On-board S/W
Maintenance System
Spacecraft Simulator
Flight Operations Control Centre (FOCC)
TM/TC Archiving: SPEVAL & WWW SPEVAL
TM
TC
Exte
rnal S
erv
er
FOSExternal
InterfacesRawTM
Raw TC
Ground Stations
Kiruna
Svalbard
LEOP Network
Flight Operations Segment Systems
AOCS Cmd Checker
Page 17ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Flight Operations Segment Performance
The FOS components continue to provide very high availability: Systems critical for satellite control (Flight Control System,
OBSM, I/F to ground stations) have shown a quasi-100% availability
Mission Planning System and its interfaces to PDS, ESTEC and AO Providers work satisfactorily
Ground station performance (FOS part) for third quarter: ESA’s Kiruna station provided 99.9% availability Svalbard (S-band) service provided 97.2% availability
Flight Control Procedures work ok – new procedures added when required in response to anomaly investigations and resolution
Page 18ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Flight Operations Segment Status
Implementation of operational improvements and additional requirements continue: Automatic DORIS manoeuvre command generation by FOCC
under development Testing and validation of MPS for Artemis operations started Implementation of improved time correlation algorithms
completed On-board S/W maintenance system and facilities
have been used to develop and validate a total of 33 patches for many of the on-board processors
Both 15m prime and 13m back-up antenna in Kiruna commissioned
Page 19ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
FOCC Time Correlation Algorithms & Results
Improved time correlation algorithms products available since 9-Oct-2002 Uses TM received in Kiruna as main reference for correlation On-Board Time to UTC Independent verification against DORIS Atomic Time performed automatically
Step Length Evolution
3906249785.50
3906249786.00
3906249786.50
3906249787.00
3906249787.50
3906249788.00
3906249788.50
3906249789.00
3906249789.50
3906249790.00
10/6 10/16 10/26 11/5 11/15 11/25
Date
Ste
p L
en
gth
(p
s/O
BT
tic
k)
Asar in Heater
Asar in Heater
Leonids Sw itch OFF
Page 20ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Satellite Operations & FOS Organisation
ENVISAT MISSIONMANAGER
SPACECRAFTOPERATIONS
MANAGER
S/W MAINTENANCESERVICES
FLIGHT DYNAMICSSERVICES
GROUND FACILITYSERVICES
PAYLOAD DATASEGMENT
PI'sUser Community
INDUSTRYSUPPORT
AO CONTROLCENTRES: AATSR,
DORIS, SCIA
FLIGHT CONTROLTEAM
PAREPRESENTATIVE
PROJECTSUPPORT
Shaded Boxes under FOS responsibility
Page 21ENVISAT Validation Workshop - ESRIN – 9-13-Dec-2002
Conclusions
The satellite and its instruments are performing well operationally and are ready for the routine phase
Commissioning of the Artemis/Envisat Ka-band interface in-orbit is planned to be performed in Mar-2003
The Flight Operations Segment and the Flight Operations and Support Teams in Industry, ESTEC and ESOC are set-up for the routine phase – ready to continue!