Transcript Section 2 - Charter / Planned Response

Space
Technology
5
“Tomorrow’s Technology Today”
GSFC
Section 19.0
Combined Ground System
Irene Bibyk
Ground System Manager
ST5 PDR June 19-20, 2001
Agenda
GSFC
• Introduction
• Mission Operation Center Integration
• Ground Data System - ASIST
• Ground Station/Network
– Flight Dynamics
• ST5 Technology Demonstration - SatTrack
• Risk Mitigation
ST5 PDR June 19-20, 2001
19-2
Space
Technology
5
“Tomorrow’s Technology Today”
GSFC
Introduction
ST5 PDR June 19-20, 2001
19-3
ST5 PDR June 19-20, 2001
Final FPD
Draft FPD
Fin FOP
Final DMR
Draft FOP
Final OCD
Review OCD
9/03
6/03
3/03
12/02
9/02
6/02
3/02
12/01
9/01
6/01
12/15/03
MRR
FOR
MOR
CDR
PDR
SIM GROUP 1
Launch
Network Test-3
Compat. Test-4
Launch Dress Rehearsal
SIM GROUP 2
Network Test-1
Compat. Test-2
Msn Readiness Test-7& 8
Compat. Test-30
Msn Readiness Test-9 & 10
Tech. Aliveness Test-3
SIM GROUP 3
Network Test-2
Msn Readiness Test-6
Msn Readiness Test-3
Msn Readiness Test-4
Msn Readiness TeST5
Compat. Test-1
Tech. Aliveness Test-2
Msn Readiness Test-2
Msn Readiness Test-1
Tech. Aliveness Test-1
GSFC
Combined Ground System & Operations
19-4
GSFC
Documentation
• Operations Concept Document - Preliminary complete
– Flight Operations Plan
– Flight Procedures Document
– Launch & Early Orbit Handbook
• Detailed Mission Requirements Document - Preliminary
complete
– ASIST ICD - Heritage from MAP & EO-1
– FD ICD
• SatTrack Requirements Document - Complete
– SatTrack Statement of Work - Complete
– SatTrack ICD
• Ground Station Requirements Document - Complete
– Ground Station Statement of Work - Preliminary complete
– Ground Station RF ICD
ST5 PDR June 19-20, 2001
19-5
Major Milestones
GSFC
FY02
Q1
FY03
Date
FY01
Q3
Milestone
Ap Ma Jun Jul Au Se Oc No De Ja Fe Ma Ap Ma Jun Jul Au Se Oc No De Ja Fe Ma Ap Ma Jun Jul Au Se
ASIST / FEDS
W/Ss
FEDS
FSW
Q4
HDS
C&DH
Q2
FlatSat
C&DH
Q3
Q4
s/c1
FSWFlatSat
Q1
Q2
Q3
Q4
s/c2&3
s/c1
s/c2&3
MOC Int & MRT
MRT1 (FlatSat Tests)
SIM#1
First Test w/MOC
MRT2 (S/C 1 Test)
SIM#2 (S/C 1 Env)
GroundSeg Tests
MRT3 (Constellation Test)
SIM#3 (S/C 2 & 3 Env)
MRR (Jul'03)
Ground Station
Selection (Jul'01)
Peer Review -Design
Gnd RF ICD
Antenna Upgrades & Compat H/W Dev
Upgrade Certification
RF Compat Test
Ground Network MRT
SatTrack
Contract Award
S/W Del#1 (OD Tool)
SatTrack (w/MRT1)
S/W Del#2 (Auto Sched Tool)
SatTrack MRT
ST5 PDR June 19-20, 2001
19-6
Space
Technology
5
“Tomorrow’s Technology Today”
GSFC
Mission Operation Center
Integration
ST5 PDR June 19-20, 2001
19-7
Requirements/Approach
GSFC
• The GDS shall provide interface support for the Autonomous
Network Scheduling and Orbit Determination S/W
(MRD 30401000)
– ASIST shall interface with SatTrack via a TCP/IP socket for ascii file
transfer
• The mission shall be capable of supporting “lights out”
operations (MRD 30500000)
– Standard GSFC automation approach with ASIST and SERS, except for
the addition of the ST5 tech demo of SatTrack
• Approach
– In-house mission operations center will be co-located with one of the
existing MOCs in Bldg. 14, such as MAP, TRACE or EO-1
• Heritage system in an existing facility will reduce risk and save money by taking
advantage of security perimeter, redundant utilities and communications. (Note:
FOT and systems are not planned to be shared)
– FOT training and control center checkout to occur during I&T
ST5 PDR June 19-20, 2001
19-8
Data Flow Diagram
GSFC
GPS
- Ranging
- Data transfer
- Science event
GSFC-site
ST5 Experimenter
Operations Center
ST5 Mission Operations Center
EARTH
- Uplink/Downlink on X-Band
- Two way Doppler Tracking
RealTime System
Offline System
RTADS (L&EO)
-Near RealTime Attitude
Determination for Launch
& Early Orbit
- Maneuver Planning
RTADS (Nominal)
- Sun sensor
- Magnetometer
N
I
S
N
Ground
Station
T
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a
c
k
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g
O
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b
i
t
P
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e
d
- Attitude
Recorder Data/VC#
ASIST
- Telemetry Monitoring
Real time Data/VC#
- Command Load & Uplink
- Data Storage
Commands/VC#
- Limit Checking
Data
- Events Monitor
- Automated STOL
Proc Exec
MMFD/Nom Ops
-Bldg 28
- Orbit Predict
- Predicted Orbit
- Exp Planning
- Instrument Eval
- Experiment Data
Processing
Magnetometer
(ASIST Assoc)
A
t
t
i
t
u
d
e
Telemetry
Commands
Mission Planning
System
Planning Aids
Auto-STOL Proc/Status
NASA
Integrated
Services
Network
O
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b
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T
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a
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k
i
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VMOC Data
Server
ST5 PDR June 19-20, 2001
Skytel
Paging
Service
JPL CCNT
Ground System
SatTrack/Tech Demo
- Automated
Ground Station
Scheduling and
- Orbit
Determination
PAGE FOT
19-9
Mission Readiness Test Flow
GSFC
Three Series of Tests (FlatSat, S/C No.1, Constellation)
Jan’03 - Apr’03
May’03 - Jul’03
S/C No.2 & No.3
Integration & Test
Aug’02 - Oct’02
S/C No.1
Integration & Test
May’02 - Oct’02
FlatSat Test Series
- Basic Timing Test
-MOC Set-up Test
- Tlm & Cmd Processing Test
- Tech Data Validation Test
-Cmd Management Test
S/C No.2 & No.3
Environmental Tests
Nov’02 - Mar’03
S/C No.1
Enviromental Tests
Apr’03 - Jun’03
Nov’02 - Mar’03
S/C No.1 Test Series
- Basic Timing Test No.2
Tech Aliveness Test No.2
- PTP Validation Test
- RF Compatibility Test(Pre-TV)
- Basic Timing Test No.2 (in TV)
- RF Compatibility Test (Post-TV)
Constellation Test Series
- RF Compatibility Tests (No.2&No.3 - Pre-TV)
- Technology Aliveness Test No.3
- Comprehensive Timing Test No.3
- FINAL End - to - End Test
(Cmd & Tlm Test)
Apr’03 - Jun’03
Ground Segment Test Series
Aug’02
Feb’03
Simulation No.1
(FlatSat)
Simulation No.2
S/C 1 (Env)
with FlatSat and/or S/C No.1
- TT&C Ground Station Tests
Mission Planning & Scheduling Tests
- SatTrack Lights-out Test
Comprehensive Ground Station Test
- Mission Science Data Processing Test
ST5 PDR June 19-20, 2001
Jul’03
Simulation No.3
S/C 2 & 3 (Env)
19-10
Status
GSFC
• High level integrated schedule with I&T
developed
• H/W and S/W purchases (ASIST/FEDS)
• I&T, Ops, subsystem staffing for I&T, Mission
Readiness Tests and Mission Operations in work
ST5 PDR June 19-20, 2001
19-11
Space
Technology
5
“Tomorrow’s Technology Today”
GSFC
Ground Data System-ASIST
ST5 PDR June 19-20, 2001
19-12
Requirements
GSFC
• The Mission shall validate the ability to take measurements
and to handle the downlink and ground data processing of
multiple data streams from multiple S/C (MRD 20300000)
– New ASIST capability where the FEDS will contain multiple ingest cards and
data streams will be sorted by S/C ID
– Existing data interface protocols will be used with SERS, FD, MPSS, and new
technologies (SatTrack and CCNT)
• The facility shall have the ability to connect with the vehicle(s)
at both baseband (i.e. Hard-Line) and RF (MRD10303080 supporting)
– Heritage connection where the FEDS shall have the ability to connect to the
vehicles during I&T
• CCSDS recommendations shall apply to space/ground com
channels and to basic space/ground services provided to
instruments by the S/C (MRD 10303050)
– CCSDS applications are heritage systems
ST5 PDR June 19-20, 2001
19-13
Requirements/Approach
GSFC
• Time correlation between the S/C clock & Coordinated
Universal Time (UTC) shall be known to within 5 msec
(3 sigma) (MRD 20500000 - supporting)
– Heritage from EO-1 for Return Data Delay (RDD) time correlation
– Ground station will append the time each VC0 CADU was received at the
ground station to the internet protocol data unit (IPDU) header and the FEDS
will read both S/C time and ground station time tag to determine S/C to UTC
time difference
• Approach: Heritage systems from IMAGE, EO-1 and MAP; ST5
FSW re-using MAP FSW; ST5 C&DH re-using MAP processor
ST5 PDR June 19-20, 2001
19-14
I&T and Operations Command & Telemetry Flows
GSFC
CCNT
Workstations
ASIST
Science
Workstations
I & T Only
S/C Data System
Bit Sync
ASIST
Primary
Workstation
I & T GSE
ASIST
Associate
Workstations
X- to S- Down
Converter
S-Band
Rcvr
I/F Box
Diplexer
FEDS
R/T
Buffer
(S/W)
Frame
Sync (S/W)
(CRC, RS)
Time Code
Card
Digital
History
Data
Storage (DHDS)
S/C Test
Connection
RF
Data
HDS
CLK
X-Band
Xponder
PCI Serial I/O
ACB2
Packet
Distribution
System
C & DH
TSS2000
Modulator
BPSK
S- to X- Up
Converter
S/C 1
Cmd Processor
S/C 2
Gnd Stat I/F
NISN
Ground
Station
S/C 3
TCPIP
Ops Only
ST5 PDR June 19-20, 2001
19-15
GSFC
Status
• ASIST Workstation deliveries to FSW and GNC
(for HDS) completed
• FEDS (Front End Data System) in development
for C&DH
– Timing card will be included
• FEDS and ASIST deliveries to FlatSat and FSW
in first quarter FY02
• Testing multiple ingest cards in FEDS
• ASIST Build 9.1 (some updates with multiple
data streams)
• Working data management and verification of
crosslink data from CCNT
ST5 PDR June 19-20, 2001
19-16
Space
Technology
5
“Tomorrow’s Technology Today”
GSFC
Ground Station/Network
19-17
ST5 PDR June 19-20, 2001
Requirements
GSFC
• The ground segment shall provide one 20-minute
contact window per S/C every orbit below 5 Re
altitude (MRD 10801000)
– For nominal operations, ground stations being required to provide
30 minutes of visibility for simultaneous data command, telemetry,
and tracking,
• Extra time added for link acquisition and margin
– Stations must be compatible with new ST5 technology transponder;
sweep, acquire and lock as listed in the ground station requirements
specification
– Data recovery goal for ground station is 90% (space to ground), in
support of technology and science validation requirements minimum
of 70% of on-orbit generated data constellation in total shall be
received by the ground (MRD 10800000 - supporting)
ST5 PDR June 19-20, 2001
19-18
Requirements
GSFC
• The ground station network shall provide X-band
command uplink capability, in at least 1 station
(MRD 10104041)
– 2 stations are highly desirable for more coverage with orbit
uncertainties and as a back-up station
– Nominal operations may be capable to work with a less-thanonce-per-orbit uplink command window (i.e., every 2nd/3rd
pass)
• Time correlation (update S/C clock), tracking and operational
scenarios will determine the uplink contact frequency
• The system uplink data rate shall be 1 Kbps.
(MRD 10303061 - supporting)
– New X-band equipment required, but data rate is not
challenging
ST5 PDR June 19-20, 2001
19-19
Requirements
GSFC
• The S/C shall have 2, ground selectable, downlink data rates: 1
Kbps (2 Ksps) and 100 Kbps (200 Ksps)
(MRD
10303063 - supporting)
– The S/C shall be capable of supporting the high rate downlink to a
communications range of 5 Re. (MRD 10303065 - supporting)
– The S/C shall be able to support the low data rate downlink at any point in
the orbit (MRD 10303066 - supporting)
• The ground station shall be capable of performing Doppler
tracking in support of orbit determination (MRD 10301020)
– The system radiometric Doppler tracking accuracy shall be sufficient to
support ground antenna pointing at distances of 2 to 5 Re. (MRD 10301011 supporting)
• Ground station oscillator must be stable enough to support
– The system shall be capable of supporting the mission using only oneway Doppler measurements from the S/C (10301012 - supporting)
• Transponder oscillator will determine performance
ST5 PDR June 19-20, 2001
19-20
Orbit Scenario
GSFC
Nominal Operations Total contact time required per orbit: ~90 mins (1.5 hrs) Range limited between 2 - 5 Re for simultaneous:
- Recorder downlink at 100 kbps (range limiting factor)
- Real-time downlink at 1 kbps
- Command uplink at 1 kbps
- Two-way Doppler tracking
Apogee @ ~5:15
5 Re @ ~7:08
L&EO: No time specs, need schedule flexibility
Any Point in Orbit for simultaneous:
- Real-time downlink at 1 kbps
- Command uplink at 1 kbps
- Two-way Doppler tracking
2hrs&24mins
144mins
5 Re
@ ~3:22
2 Re @ ~9:32
Perigee @
~10:31
2 Re
@ ~0:58
Perigee @
~0:00
ST5 PDR June 19-20, 2001
Notes (for s/c illustration):
All attitude and orientations not to scale
S/C and antenna beam not to scale
S/C distances not to scale
19-21
Orbit Analysis - Preliminary
GSFC
Assumptions: Apogee at ascending node, perigee at descending node, Epoch December, Antenna spinning
86-40ºoff boresight, inclination of 25 º, eclipse not included
L&EO
ST-5 Coverage Summary Table 14 Day Pass Stats (mins)
Req: Flexibility
Unconstrained Range from Station
to ensure H&S C/O---->
Antenna Pointing Ecliptic North
Antenna Pointing Ecliptic South
Kiruna
Fairbanks
Horsham
Madrid
Goldstone
South Florida
Hawaii
Canberra
Nominal
Operations
Req: 180 mins/day ---->
Kiruna
Fairbanks
Horsham
Madrid
Goldstone
South Florida
Hawaii
Canberra
Maximum
Minimum
584.6
608.7
452.6
360.8
343.1
326.7
300.8
0.0
111.2
76.6
22.1
0.1
10.6
0.8
0.6
0.0
Average Min/Day
293.4
289.5
172.6
145.8
133.5
129.7
104.4
0.0
398.2
413.5
308.1
302.0
276.6
222.4
164.0
0.0
Maximum
Minimum
Average
0.0
0.0
0.0
0.0
0.0
57.2
174.0
525.4
0.0
0.0
0.0
0.0
0.0
31.0
26.3
0.8
0.0
0.0
0.0
0.0
0.0
41.3
105.2
203.9
Min/Day
0.0
0.0
0.0
0.0
0.0
8.8
52.6
407.7
Constrained 1-5 R e Range from Station
Antenna Pointing Ecliptic North
Maximum
Minimum
132.7
135.3
139.0
124.0
121.0
131.0
141.7
0.0
81.3
3.6
2.6
5.6
5.4
3.6
0.5
0.0
Average Min/Day
113.9
97.3
55.6
58.0
59.9
72.2
94.4
0.0
122.0
118.1
91.3
107.7
89.8
77.3
87.7
0.0
ST5 PDR June 19-20, 2001
Antenna Pointing Ecliptic South
Maximum
Minimum
Average
0.0
0.0
0.0
0.0
0.0
55.1
127.5
148.3
0.0
0.0
0.0
0.0
0.0
26.6
26.3
3.9
0.0
0.0
0.0
0.0
0.0
36.3
84.7
68.4
Min/Day
0.0
0.0
0.0
0.0
0.0
7.8
42.3
102.6
19-22
Requirements
GSFC
• Ground station-received AGC levels in addition to autotracking antenna angles shall be provided (MRD 10104024)
– Ground stations to provide data each pass in support of transponder
performance validation
• Information is currently available today - no changes
• Time correlation between the S/C clock and UTC shall be
known to within 5 msec (3 sigma) (MRD 20500000 - supporting)
– Telemetry received by the ground network shall be time tagged to an
accuracy of at least 1 msec (3 sigma) of UTC (20504000)
• With today’s GPS H/W at the ground stations, this can be accomplished easily
ST5 PDR June 19-20, 2001
19-23
Approach
GSFC
• Modify an existing station network to support ST5
– Many existing stations have S-band transmitter with an X-band
receiver and the receiver is compatible with ST5 transponder
– DSN only station network with X-band transmitter and receiver
(not planning to use DSN for ST5 Operations)
ST5 PDR June 19-20, 2001
19-24
Status
GSFC
• Requirements document (ST5-495-052) completed
• SOW (ST5-495-064) and Task Order in process
• Preliminary visibility analysis completed
• Major Milestones
– Ground station (commercial or government) on board - August 2001
– Ground Station ICD - December 2001
– RF Compatibility tests - November 2002
– MRT- Operational Readiness - May 2003
ST5 PDR June 19-20, 2001
19-25
Space
Technology
5
“Tomorrow’s Technology Today”
GSFC
Flight Dynamics
ST5 PDR June 19-20, 2001
19-26
Approach
GSFC
• Pre-launch-develop and verify tracking method
– Pre-launch support for 2-way Doppler tracking requirement definition
and verification
– Post launch, MMFD located in Bldg 28 (GSFC) is prime for OD support
at launch and during nominal mission operations
• Orbit determination within 10 km for ground antenna
pointing
– An 11-m ground antenna at a distance of 2 Re from S/C, orbit position
knowledge of 24Km (3 sigma) or a deviation of no more than 8Km
(1 sigma)
• Maneuver support during launch and early orbit
– Attitude and orbit determination
• Attitude and orbit product generation
– Products required throughout operations
ST5 PDR June 19-20, 2001
19-27
Space
Technology
GSFC
5
“Tomorrow’s Technology Today”
Autonomous Network Scheduling
and Orbit Determination S/W
Requirements
ST5 PDR June 19-20, 2001
19-28
Technology Demonstration
GSFC
• Technology Provider - Bester Tracking Systems, Inc.
• Technology Description
– Future Ground Operations Automation for Constellations Enabling Technology
• S/W tool to perform autonomously
• Ground station scheduling and orbit determination
• Experience
– 1st revision to be used on HESSI
• HESSI uses GSFC’s ITOS ground system
• Technology Readiness Level
=> Currently: 4 (SatTrack)
=> Currently: 2 (New tools)
=> Phase D: 7
– Ground station schedule conflict resolution
• Station view periods, dynamic link margin, S/C emergencies, time constrains
– Flight Dynamics Requirements
• Includes comprehensive products such as orbit determination, mission planning
products, state vectors, real-time graphic & alphanumeric displays
ST5 PDR June 19-20, 2001
19-29
Requirements
GSFC
• The system shall validate the Autonomous Network
Scheduling and Orbit Determination S/W (MRD 10108000)
– In addition to actual assets for the mission (i.e. 3 S/C and 2 ground
stations), a set of virtual assets (i.e. both S/C and ground stations)
shall be simulated and supplied to the Autonomous Network
Scheduling and Orbit Determination S/W for processing
(MRD 10108020)
– Flight validation of the Autonomous Network Scheduling and Orbit
Determination S/W shall be accomplished through comparison of
the generated output with standard orbit determination S/W and
manual ground resource scheduling techniques (MRD 10108010)
– Anomalous operation of the Autonomous Network Scheduling and
Orbit Determination S/W shall not degrade the operation of the S/C
(MRD 10108040)
ST5 PDR June 19-20, 2001
19-30
ST5 Mission Operations Scenario of 3 real and 97 virtual satellites
GSFC
ST5 PDR June 19-20, 2001
19-31
GSFC
Data Flow for SatTrack Validation
Multi-Mission
Flight Dynamics
Ground Station(s)
Tracking Data
Orbit Determination
Mission Planning
Product Generation
Schedules
Commands
Telemetry
ASIST/FEDS
SatTrack
Commanding
Telemetry Monitoring
Data Storage
Automated STOL
Procedure Initiation
Status feedback
Orbit Determination
Mission Planning Product
Generation
Command Loads
Ground Station Scheduling
Mission Planning /
Scheduling System
Mission Planning
Load Generation
Mission Planning Products
Ground Station
Scheduling
ST5 PDR June 19-20, 2001
19-32
GSFC
SatTrack S/W Technology
• Used for efficient management and Autonomous
Operation of a Satellite Constellation
– Autonomous scheduling of ground station contacts
• Calculate station access based on number of constraints (line-of-sight,
geometry, link margin)
– Calculate priorities to resolve conflicts based on various input
parameters
• data volumes, station capability & availability, science requirements, S/C
emergencies, operator overrides, etc.
– Autonomous Orbit Determination
• Derive updated state vectors from angle & range rate measurements
• Verify & archive new state vectors
• Generate mission planning products with new state vectors
ST5 PDR June 19-20, 2001
19-33
GSFC
SatTrack Status
• Status
– Requirements document (ST5-495-046) completed
– SOW (ST5-495-045) completed, waiting for proposal
• Major Milestones
– S/W delivery 1 (Orbit Determination Tool)-July 2002
– S/W delivery 2 (Automated Scheduling Tool)-February 2003
– Mission Readiness Test-April 2003
ST5 PDR June 19-20, 2001
19-34
Space
Technology
5
“Tomorrow’s Technology Today”
GSFC
Risk Mitigation
ST5 PDR June 19-20, 2001
19-35
GSFC
Risk Mitigation
• Risk: No ground stations are currently compatible with ST5
transponder which lead to uncertainties with costs and
schedule for upgrades
– Mitigation: CSOC has identified potential vendors with a fixed-price cost
estimate
• Risk: Actual launch scenario not fully defined resulting in
ground system uncertainty
– Mitigation: Concerned about ground station visibility to meet requirements for
L&EO, tracking, health & safety, and data recovery
– Preliminary analysis has identified visibility against typical launch scenario
• Risk: Staffing in the timeframe prior & during S/C No.2 &
No.3 flow
– Mitigation: Relying on subsystem personnel to supplement Mission
Operations activities
– Relying on an existing GSFC MOC facility with most interfaces for Mission
Operations in place
ST5 PDR June 19-20, 2001
19-36