GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
ISOC CDR, 4 August 2004
GLAST Large Area Telescope:
Instrument Science Operations
Center
CDR
Section 5
Software Architecture
Steve Culp
SLAC
sculp@slac.stanford.edu
650-926-8987
Document: LAT-PR-04500
Section 5
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GLAST LAT Project
ISOC CDR, 4 August 2004
Agenda





Requirements Mapped to Software
Software Architecture
Development and Testing Schedule
Staffing Level (ROM)
Demo
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GLAST LAT Project
ISOC CDR, 4 August 2004
Requirements Mapped to Software
–
–
–
–
Reviewed all ISOC level III requirements
Identified which required software
Identified existing tools which satisfied all or part of reqt
Identified where new development needed
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GLAST LAT Project
ISOC CDR, 4 August 2004
Requirements breakdown

Each requirement was identified as:
1. Procedural (non-software)
42
2. Existing software (commercial or other well-established
software -- i.e. implementation Done!)
277
3. Under development by SAS
(mostly done, refer to SAS for status)
39
4. To be developed by others (I&T, FSW, ITOS)
21
5. Remaining new development
88
total

467
Some requirements map to multiple categories or SW tools, so
total exceeds total number of level IIIs (379)
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GLAST LAT Project
ISOC CDR, 4 August 2004
1. Procedural
(no SW development)
Name
# Level 3 Reqts
% of Reqts
N/A
19
4.1%
Ops Procedures
12
2.6%
SCS
11
2.4%
42
9.0%
(e.g. facility reqts)
(SLAC Computer Services)
Total
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GLAST LAT Project
ISOC CDR, 4 August 2004
2. Existing software
Name
Description
# Level 3
Reqts
% of
Reqts
ITOS
satellite C&T package
215
46.0%
GSFC
ATNS
Anomaly Tracking and
Notification System
32
6.9%
FASAT (commercial) or
RXTE SOF Process Mgr (RXTE)
secure file transfer
15
3.2%
FastCopy (commercial),
DTS (HEASARC)
CVS
file config mgmt tool
5
1.1%
Open Source
STK
Satellite Tool Kit
4
0.9%
commercial
LAT documentation
management tool
4
0.9%
existing SLAC LAT tool
NTP
synchronize computers
1
0.2%
Open Source
email
electronic mail
1
0.2%
Open Source
277
59.3%
FastCopy / DTS
LATDocs
Total
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Source
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GLAST LAT Project
ISOC CDR, 4 August 2004
3. Under Development by SAS
Name
Description
# Level 3
Reqts
% of
Reqts
GINO
pipeline manager
21
4.5%
DATACHKTOOL
check quality of science data
telemetry
6
1.3%
SASTOOL1
generate level 1 science data
products
6
1.3%
SASTOOL2
generate level 2 science data
products
4
0.9%
SASAUTO
manage automatic generation of
level 1 & 2 data products
2
0.4%
39
8.4%
Total
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GLAST LAT Project
ISOC CDR, 4 August 2004
4. To be developed by others
Tool Name
Description
# Level 3
Reqts
% of
Reqts
Source
ELOG
electronic log book
8
1.7%
I&T Online
(mostly done)
DIAGTOOL
diagnostic access
7
1.5%
FSW
ITOS
Enhancements
minor changes to ITOS to
meet specific reqts
3
0.6%
GSFC
IRFTOOL
generate instrument
response function
2
0.4%
SVAC
DBCAL
create database of LAT
calibration data
1
0.2%
SVAC
21
4.5%
Total
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GLAST LAT Project
ISOC CDR, 4 August 2004
5. Remaining to be developed
Tool Name
Description
# Level 3
Reqts
% of
Reqts
Comments
PLOTTOOL
plotting
28
6.0%
combination of existing tools (e.g.
ROOT, HippoDraw, JAS, IDL) & new
dev
TRENDTOOL
trending
16
3.4%
combination of IDL, DTAS (used by
MOC), and/or TAPS (GSFC)
PLANTOOL
mission planning
6
1.3%
generate timeline and commands
for LAT operation
CONSTRAINT
TOOL
check command sequences
against constraints
12
2.6%
DB
database definition and
implementation
10
2.1%
DBIN
ingest ISOC data
7
1.5%
WEBTOOL
provide web access to data
products
9
1.9%
88
18.8%
Total
Document: LAT-PR-04500
partially done by SAS, I&T, FSW coordinating dev with SAS, I&T,
FSW, SCS
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GLAST LAT Project
ISOC CDR, 4 August 2004
Software Architecture
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GLAST LAT Project
ISOC CDR, 4 August 2004
Primary Software Data Flows
LAT ISOC
MOC
Level 0 Data,
Integrated Observ. Timeline,
As-Flown Timeline,
Flight Dynamics Products,
Anomaly Reports,
PDB updates,
LAT/GBM Sci Alerts,
LAT/GBM/SC Problem Alerts
Level 0
Sci Data
Receive
& Archive
Science
Data Analysis
Pipeline
Level 0
Hkpg Data
Science Plan
LAT Science Activity Timeline,
LAT Instrument Commands,
LAT Instrument Loads
Mission
Planning
Receive
& Archive
Commands
to Verify
Anomaly
Tracking &
Notification
System
Alerts, Logs,
Process status,
File status
Document: LAT-PR-04500
Archive
& Send
GSSC
CHS
monitoring
& trending
Integrated Observ. Timeline,
As-Flown Timeline,
Flight Dynamics Products
GSSC
Level 1&2
Sci Data
Products
Level 1&2 Sci Data Products,
LAT Science Activity Timeline,
LAT Instrument Commands,
LAT Instrument Loads
LAT Test Bed
Contingency:
LAT Instrument Commands,
LAT Instrument Loads
Archive
& Send
MOC
Tested
OK
All data into ISOC,
and products out
Database
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Web
Access
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GLAST LAT Project
ISOC CDR, 4 August 2004
Automatic Telemetry Processing
LAT ISOC
Science Data Analysis Pipeline
Calib.
DB
Calibration Trending
Level 0
sci & hkpg
telemetry
MOC
GINO
& FastCopy/DTS
Receive
& Archive Level 0
science
telemetry
Apply
Calibration
Reconstruction
System-level
Monitor
Archive
& Send
Level
1&2
data
products
Level 2 processing
Subsystemlevel
monitor
Realtime Level 0
hkpg telemetry
(during contacts)
GINO
& FastCopy/DTS
Level 1 processing
GCN
GSSC
Transient
Search
Level 0
hkpg
telemetry
ITOS
Monitor hkpg
parameters
Text & Stripchart
displays (optional)
Monitor
Trends
ITOS
Monitor
Data
Reports, Log entries,
Data Products
received and sent
Alerts, Logs,
Process status,
File status
FASAT
Anomaly
Tracking &
Notification
System
Database
STOL Config monitor scripts
Beeper / email message
Beeper / email message
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GLAST LAT Project
ISOC CDR, 4 August 2004
Report Generation and Use
Report
Frequency
Source
Auto
Generation
Manual
Input
Destination
Read By
Daily
ISOC
Yes
Optional
Web
Human
Daily (TBR)
ISOC
Yes
Optional
Web
Human
Level 0 Transmission
Level 0 receipt
ISOC
Yes
No
MOC
Computer
Data Trending
Level 0 receipt
ISOC
Yes
No
Web
Human
Daily (TBR)
ISOC
Yes
No
Web
Human
Level 0 receipt
ISOC
Yes
No
Web
Human
LAT Incident Reports
As needed
ISOC
No
Yes
MOC
Human
SC Incident Reports
As needed
MOC
No
Yes
ISOC
Human
TBD
MOC
Yes
TBD
ISOC
Computer/
Human
LAT Health and Status
LAT Performance
LAT Command History
Data Processing
Reports
As-Flown Timeline
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GLAST LAT Project
ISOC CDR, 4 August 2004
Command and Telemetry
Definition File Verification
LAT ISOC
Modify .dbx
file(s)
MOC
.dbx
files
Project Database
(master Cmd &Tlm
definitions)
OK (test passed with
new .dbx file(s)
ITOS
Replay Commands
& Receive Telemetry
CCSDS
Commands
LAT Testbed
telemetry
Command log,
error log and optional
Text/Stripchart displays
Test Suite
of STOL
Commands
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GLAST LAT Project
ISOC CDR, 4 August 2004
Nominal LAT Command Process
Mission Operations
Center
(MOC)
GLAST Science
Support Center
(GSSC)
Final Science Timeline
Science Plan
(Phase 2)
TDRSS Schedule
Engineering Plan
Mission Timeline
Preliminary and Final
Science Timelines
Command Plan
ISOC
Command Plan
ATS Commands
Mission
Planning
Operations
Plan
Command
Plan Build &
Review
Verification &
Validation
File Uploads
Command Procedures
Feedback
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GLAST LAT Project
ISOC CDR, 4 August 2004
Command Load Generation & Verification
LAT ISOC
Command Load
(new)
Generate
Command Load &
Perform
Constraint Checking
Verified
OK
GSSC
STOL commands
ITOS
Issue Commands
& Receive
Telemetry
CCSDS
Commands
LAT Test Bed
telemetry
Command log,
error log and optional
Text/Stripchart displays
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GLAST LAT Project
ISOC CDR, 4 August 2004
Data Display and Analysis Support


Web access
– Data products (logs, reports, level 0/1/2 data)
– Electronic logbook provides log entry, log and report viewing,
and file download
– Password protection on privileged actions (e.g. log entry, data
download)
Tools
– Includes ROOT, HippoDraw, IDL, and JAS
– Used in ISOC to generate reports accessible over web
– Data download allows users to process data locally with tools
installed on their machine
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GLAST LAT Project
ISOC CDR, 4 August 2004
Electronic Logbook



Running record of ISOC and its data products in and out
– Program currently in use by I&T can meet ISOC requirements
– All entries go in relational database
– Web-accessible
Includes
– Record of data products received and sent
and links to each
– User comments
– Time tag on each entry
Suggested Metric for ISOC
– Response times – e.g. from receipt of level 0 data to sending of
level 1 & 2 products
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GLAST LAT Project
ISOC CDR, 4 August 2004
ISOC Network and Hardware Architecture
SLAC
Internet
LAT ISOC
Web
Server
…
Firewall
PVO
Workstations
FSW
Workstations
CHS
Workstations
Linux PC
(Hkpg
Replay
ITOS)
(Realtime
connection
ITOS)
Firewall
Gateway
System
(Oracle, GINO,
FastCopy/DTS)
Firewall
SCS
CPU Farm
SAS/SP
Workstations
Linux PC
Abilene
Network
SCS
Storage Farm
MOC
GSSC
Solaris
Workstation
(VxWorks
tools)
1553
LAT
Test Bed
SIIS
LVDS (S/C Sim)
Linux PC
(Test Bed
ITOS)
LAT Test Bed Lab
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Anomaly
Tracking &
Notification
System
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GLAST LAT Project
ISOC CDR, 4 August 2004
Software Development & Testing Schedule
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GLAST LAT Project
ISOC CDR, 4 August 2004
Testing

Four software releases
– Each level 3 requirement will
• be mapped to the release where first needed
• have test procedures defined
– Each release includes functionality required for subsequent GRTs
• R3 (Dec 05) includes all requirements
• R4 (Jul 06) includes enhancements based on user experience
(e.g. during Mission Simulation)
– Two weeks prior to each release
• test that requirements newly included in that release are met
• regression test previously included requirements
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GLAST LAT Project
ISOC CDR, 4 August 2004
Summary of ISOC Software Capabilities
for GRTs & ETEs
Date
What
Release
15-Apr-05
GRT 2
ISOC 1
(1 Apr 05)
15-Jun-05
GRT 3
“
1-Sep-05
GRT 4
ISOC 2
(15 Aug 05)
15-Nov-05
GRT 5
“
11-Feb-06
ETE 1
ISOC 3
(15 Dec 05)
15-Feb-06
GRT 6
“
contingencies added
15-Apr-06
ETE 2
“
provide instrument commands and file loads,
support memory dumps of instrument
1-May-06
GRT 7
“
clean-up and regression tests
1-May-06
Mission Sims
“
full ISOC capabilities to support Mission Sims (from May 2006 through launch)
15-Jun-06
ETE 3
“
support basic observatory operations
25-Aug-06
ETE 4
ISOC 4
(25 Jul 06)
14-Oct-06
ETE 5
“
regression test and contingencies
1-Feb-07
ETE 6
“
final ETE at launch facility
Document: LAT-PR-04500
Required ISOC capabilities
receive real-time HK data from MOC,
provide basic LAT P&S (Planning & Scheduling)
level 0 data processing on science data,
IOC processes science level 0 data into level 1 products
receive level 0 data from MOC
provide level 1 and 2 data products to GSSC,
provide more complex LAT P&S,
provide LAT file uploads to GSSC,
provide simulated science data
provide Level 1 data products to GSSC,
receive Level 0 files from MOC (post-test)
instrument turn on
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GLAST LAT Project
ISOC CDR, 4 August 2004
ISOC Software Development Schedule
Phase / Milestone
A
u
g
0
4
S
e
p
0
4
O
c
t
0
4
N
o
v
0
4
D
e
c
0
4
J
a
n
0
5
F
e
b
0
5
M
a
r
0
5
A
p
r
0
5
M
a
y
0
5
J
u
n
0
5
J
u
l
0
5
A
u
g
0
5
S
e
p
0
5
O
c
t
0
5
N
o
v
0
5
D
e
c
0
5
J
a
n
0
6
F
e
b
0
6
M
a
r
0
6
A
p
r
0
6
M
a
y
0
6
J
u
n
0
6
J
u
l
0
6
A
u
g
0
6
S
e
p
0
6
O
c
t
0
6
N
o
v
0
6
D
e
c
0
6
J
a
n
0
7
F
e
b
0
7
ISOC CDR
ITOS setup/configuration
ISOC Verif. with Test Bed
Diagnostic Tool Dev
Mission Planning Dev
DB/Web/E-logbook Dev
Plotting/Trending Dev
SW enhancements
ISOC Demos
ISOC Simulation Testing
ISOC SW Releases
1
2
4
3
Ground Readiness Tests
2
3
4
5
7
6
End-to-End Tests
1
2
3
4
6
5
Environmental tests at NRL
ISOC testing at NRL
ISOC ready to take over LAT operation
ISOC used to I/F with LAT (front-door only)
Mission Simulations
Launch
SW Dev Slack Times
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M
a
r
0
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GLAST LAT Project
ISOC CDR, 4 August 2004
Staffing Level (ROM)



Based on review of level 3 requirements
– Average LOC per reqt is >10 and <100
– 80 LOC per reqt appears conservative (probably high)
Of 467 reqts, 88 remain to be developed
and all need to be verified
– 88 reqts x 80 LOC/reqt = ~7,000 LOC (ROM)
– Estimate 2,000 LOC per programmer per year
– 7,000 LOC to develop / 2,000 LOC/pgmr-yr
= 3.5 programmer years
Release 4 is July 06
–  ~ 2 calendar years of development
– But with slack time and more intensive 1st year of
development, need 3 programmers + 1 tester
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GLAST LAT Project
ISOC CDR, 4 August 2004
Status



Architecture concept is solid
Ready to proceed
– Refine and document software design
– Implement it
– Lots of testing and demos
I.e. lots of work to do…
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GLAST LAT Project
ISOC CDR, 4 August 2004
ITOS Demo
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GLAST LAT Project
ISOC CDR, 4 August 2004
ITOS Demo
Play back simulated LAT housekeeping telemetry
• In real-time -this simulates:
– Real-time connection to MOC for S/C contact periods
– ISOC test bed use for verifying command sequences and
ITOS Command & Telemetry definition files
• Fast replay -this simulates:
– Rapid replay of LAT and S/C housekeeping data files
received from MOC after download from SSR
• Examine print file generated during playback
– Configured to record parameters of interest
– Available for download through e-logbook
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