x ray missions delta gratings redux n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
X-ray Missions Delta: Gratings Redux PowerPoint Presentation
Download Presentation
X-ray Missions Delta: Gratings Redux

Loading in 2 Seconds...

play fullscreen
1 / 18

X-ray Missions Delta: Gratings Redux - PowerPoint PPT Presentation


  • 159 Views
  • Uploaded on

X-ray Missions Delta: Gratings Redux. Mission Operations Jeffrey Ferrara (original study) 19 – 23 March, 2012 Deborah Knapp ( Redux study) 2 - 4 May 2012. Topics. Mission Operations Summary Ground System Functional Architecture MOC Architecture (typical)

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 'X-ray Missions Delta: Gratings Redux' - fredericka-nolan


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
x ray missions delta gratings redux

X-ray Missions Delta:Gratings Redux

Mission Operations

Jeffrey Ferrara (original study) 19 – 23 March, 2012

Deborah Knapp (Redux study) 2 - 4 May 2012

topics
Topics
  • Mission Operations Summary
  • Ground System Functional Architecture
  • MOC Architecture (typical)
  • Study Requirements – Mission Operations
  • Key Customer Requirements
  • Mission Overview
  • Mission Timeline
  • Technology Assessment
  • Cost Basis of Estimate
  • Mission Operations Periods
  • Staffing Periods Used for Costing
  • Cost Summary
  • Cost Summary of Gratings Study
  • Risk/Issues/Concerns
  • Additional Trades
  • Acronyms
mission operations summary
Mission Operations Summary
  • Mission Operation Control (MOC):
    • Provides “standard” set of functional components to support Mission Operations (e.g., S/C commanding, mission planning/scheduling, and RT TLM monitoring, HK trending and analysis).
    • Provides level zero processing (LZP)
      • Level 0 Products: Time-ordered, quality annotated data sets produced for each contact
      • Level 0 products transferred to Science Operations Center (SOC)
    • Provides voice communications between the MOC & SOC for coordination
  • Space-Ground contact profile
    • DSN (34 meter antenna)
    • TDRSS for launch & early mission operations
  • Spacecraft data link rates:
    • DSN
      • S-band via HGA
        • 2 kbps command
        • 8 kbps housekeeping telemetry
      • S-band via Omni
        • 1 kbps command
        • 2 kbps housekeeping telemetry
      • Ka-band
        • 10 Mbps science telemetry
    • TDRSS
      • 1 kbps command
      • 1 kbps telemetry
  • Data Latency Requirements:
    • 72 hour required
  • Data Recovery:
    • Assume 98% recovery requirement (end-to-end)
  • Orbit Determination via DSN ranging
ground system functional architecture
Ground System Functional Architecture

Legend:

CMD = Commanding

HK = House-Keeping data

TLM = Telemetry data

Launch & early mission

S-band

TLM: 1 kbps

CMD: 1 kbps

Ka-band

TLM: 10 Mbps

S-band

TLM: 8 kbps

CMD: 2 kbps

Mission Ops Center

Mission planning & scheduling

Orbit determination/control

Network & contact scheduling

Commanding

S/C monitor/control

RT health/safety processing

Trending/Analysis

Instrument data handling

Level 0 product processing

Level 0 Data Archive

FDF is costed by FDF engineer

Science Ops

Center

Data Processing & Analysis

Experiment planning

Payload monitoring

Costed by customer

Voice

DSN Prime

TLM, HK

WSC

TLM, HK 1.5 Mbps CMD

TLM, HK 1.5 Mbps CMD

Basis of cost study is in red

moc architecture typical
MOC Architecture (typical)

Level Zero Processing

Attitude Control

Flight Dynamics

Telemetry & Command

Data Front-end System

Ground

Stations

SOC

LAN/Message Bus

Mission File Server /Archive

Anomaly Notification

Event Display/ Logging

Data Analysis & Trending

Mission Planning & Scheduling

Email & Internet Access

Internet

key customer requirements
Key Customer Requirements
  • Launch date: 6/11/2021
  • Mission Life: 3yrs. required, 5 yrs. Desired
    • Begins after 3 month trip to L2
  • SE L2 solar orbit (with ~800,000 x ~500,000 km halo) with no eclipses
  • Class B mission
mission overview
Mission Overview
  • X-ray telescope with 1 instrument, the X-Ray Grating Spectrometer (XGS) [either OP or CAT]
  • X-ray spectroscopy of selected targets
mission overview1
Mission Overview

Launch (L) at T0

Transfer Trajectory Insertion (TTI) at

L + 25 to 120 minutes

After outgassing

Jettison/Open Flight Mirror Assembly Covers,

Open Instrument,

LV Separation: TTI + 5 minutes

Calibrate w/ Celestial Targets

then start Science Ops

Deploy Solar Arrays & High Gain Antenna

ELV Dispersion Corrections at TTI + 24 hours

Commence Instrument Aliveness Checks

EOM/Disposal: L + 5 years

Spacecraft full power on

First Mid-Course Correction: TTI + 16 days

Commence Observatory Checkout

Instrument internal background measurements

Second

Mid-Course Correction: TTI + 60 days

Arrive L2, continue with Science Ops

L2 Orbit Insertion (L2OI) TTI + 100 days

Launch (L) at T0

mission timeline
Mission Timeline

Launch

6/11/2021

L2

Insertion

Disposal

Prime Mission

36 - 60 months

Mission

Closeout

Cruise

100 days

1 month Instrument Aliveness

Checks

Nominal Operations

technology assessment
Technology Assessment
  • Use COTS/GOTS S/W & H/W as basis for MOC implementation
    • Software packages are available to satisfy MOC required functionality:
      • ITOS, ASIST, EPOCH 2000, ALTAIR are commercially available today and provide required functionality for Spacecraft Command/Control and Level Zero (LZ) Processing.
    • Standard PC’s typically with Linux as OS
    • Low data volume so no special/new technology required
    • Most required technologies have been at least demonstrated; many in currently operational systems.
  • Technology Complexity: Low
    • Technology Readiness Level: 9
cost basis of estimate
Cost Basis of Estimate
  • Goddard estimated FY2012 Cost Rates used ((FY2010*.024)*.026)
    • More detail available in the Costs Spreadsheet
  • Development Cost Assumptions
    • For MOC planning/scheduling, command load generation/validation and data processing support
          • Provides three physical h/w strings (primary, backup & test)
    • Most MOC functions are provided by COTS and/or GOTS software
    • Minimal new development for Mission unique requirements.
  • Operations Staffing Cost Assumptions
    • 8 x 7 operations
    • 3 yr mission duration begins after 3 month trip to L2
  • Communications Link Cost Assumptions
    • DSN
    • TDRSS for launch & early mission
    • Daily downlinks (15 minutes typical)
    • T1 links between ground elements (1.544 Mbps)
  • Level 0 Processing
    • Data available near real time
  • NOTE: FDF costs are provided by the FDF engineer; SOC costs are provided by the customer
mission operations periods
Mission Operations Periods

Period 4 (2 months)

Period 5 (38-62 months)

Preliminary

Design

Final

Design

Mission

Cleanup

Bus & P/L

Fab/Assy/Test

Payload

Primary Ops

Bus & P/L

I&T

System

Definition

Prep for

Launch

Launch &

Checkout

Phase B

Start

11/23/18

CDR

11/23/188

PDR

1/19/18

Project

Start

3/6/15

Phase C

Design

Phase B

Definition

Phase A

Preliminary Analysis

Period 1 (21.25 months)

Mission

Definition

10.25 months

24 months

11 months

Period 3 (8 months)

Period 2 (22 months)

Period 6 (3 months)

Launch

6/11/2021

Disposal

9/9/246

Phase D-1 Subsystem Development and

Spacecraft Integration and Test

Funded Schedule Reserve

6 mo.

Phase E/F

Operations

Phase D-2

Launch &

Checkout

Period 5-1

(1 month)

13 mo

9 mo

3 mo

1 month

42 months

31 months

cost summary rom
Cost Summary (ROM)

FOR COMPARISON

risk issues concerns
Risk/Issues/Concerns
  • Risks
    • If the ACS fails such that the Solar Array is not shielding the FMA, then only a small attitude change could endanger the FMA (i.e., cause it to point sunward). Under the right circumstances there would be little time for the FOT to react to the situation before FMA failure. Could mitigate with FMA cover for safehold or additional sun shade.
  • Issues
    • none
  • Concerns
    • none
additional trades
Additional Trades
  • Consider reducing staffed hrs. to 8x5 or even less
  • Consider a multi-mission MOC
acronyms
Acronyms

CDR Critical Design Review

CMD Command

COTS Commercial Orbital Transportation Services or Commercial Off the Shelf

DSN Deep Space Network

EOM End of Mission

ES L2 Earth – Sun Lagrange Point

FT Functional Test

GOTS Government Off the Shelf

HGA High Gain Antenna

HK Housekeeping

Kbps Kilo-bits per second

LV Launch Vehicle

LZP Level Zero Processing

Mbps Mega-bits per second

MOC Mission Operations Center

RT Real Time

SA Solar Array

S/C Spacecraft

SOC Science Operations Center

TDRSS Tracking & Data Relay Satellite System

TLM Telemetry

ITOS, ASIST, EPOCH 2000, ALTAIR are COTS/GOTS available software packages for controlling spacecraft & performing level zero processing