Презентация на тему LRO Mission Overview

Robotic Lunar Exploration Program
LRO Objectives

Characterization of the

lunar radiation environment, biological impacts, and potential mitigation. Key aspects of this objective include determining the global radiation environment, investigating the capabilities of potential shielding materials, and validating deep space radiation prototype hardware and software.

Develop a high resolution global, three dimensional geodetic grid of the Moon and provide the topography necessary for selecting future landing sites.

Assess in detail the resources and environments of the Moon’s polar regions.

High spatial resolution assessment of the Moon’s surface addressing elemental composition, mineralogy, and Regolith characteristics

2009
Apollo provided only a small glimpse of Moon; much

to be explored
LRO address both science and exploration objectives
LRO brings many benefits (e.g., future landing sites, polar resources, safety, science)

LRO selected instruments complement other foreign efforts
Six instruments competitively selected (“next-generation payload”)
Comparison to foreign systems demonstrate uniqueness and value
LRO will also accommodate a HQ directed Technology Demonstration payload, the Mini-RF (SAR) instrument.

LRO will enhance our knowledge of the Moon and increase the safety of future human missions.
3D maps of terrain and hazards, as well as of localized resources (ice) will tell us where to land (and at what precision).
Exploration of new sites where resources may be available requires new and timely knowledge of those sites at scales never before possible.

Current state of knowledge does not allow us to reduce the risk and cost of humans landing and working on the Moon.
Equatorial environment (terrain, thermal, lighting) is different from polar region.
Apollo Program flight system capability limited to equatorial region (capability)

Investigation Background

mapping
Resource imaging
Temperature mapping (find cold traps)

rocket into a direct insertion trajectory to the moon.
On-board

propulsion system used to capture at the moon, insert into and maintain 50 km altitude circular polar reconnaissance orbit.
1 year mission
Orbiter is a 3-axis stabilized, nadir pointed spacecraft designed to operate continuously during the primary mission.

LRO Mission Overview Flight Plan – Direct using 3-Stage ELV

LRO Instruments

Lunar Orbiter Laser Altimeter (LOLA) Measurement Investigation – LOLA will determine the global topography of the lunar surface at high resolution, measure landing site slopes and search for polar ices in shadowed regions.

Lunar Reconnaissance Orbiter Camera (LROC) – LROC will acquire targeted images of the lunar surface capable of resolving small-scale features that could be landing site hazards, as well as wide-angle images at multiple wavelengths of the lunar poles to document changing illumination conditions and potential resources.

Lunar Exploration Neutron Detector (LEND) – LEND will map the flux of neutrons from the lunar surface to search for evidence of water ice and provide measurements of the space radiation environment which can be useful for future human exploration.

Diviner Lunar Radiometer Experiment – Diviner will map the temperature of the entire lunar surface at 300 meter horizontal scales to identify cold-traps and potential ice deposits.

Lyman-Alpha Mapping Project (LAMP) – LAMP will observe the entire lunar surface in the far ultraviolet. LAMP will search for surface ices and frosts in the polar regions and provide images of permanently shadowed regions illuminated only by starlight.

Cosmic Ray Telescope for the Effects of Radiation (CRaTER) – CRaTER will investigate the effect of galactic cosmic rays on tissue-equivalent plastics as a constraint on models of biological response to background space radiation.

LRO Preliminary Design

38.4Kbps
(UART)
Thermal
Card
1553B
Serial IF
L E N D
D
i v i
n e r
C
R
A
T
E
R
SpaceWire (HSB)
1553B (LSB)
125 Mbps (Science Downlink)
Mini-
RF
8 to 32Mbps
(Max.)
BAE

SpaceWire
ASIC

1553
Summit

3U-cPCI

SpaceWire
FPGA

SpaceWire
FPGA

SpaceWire
FPGA

SpaceWire
FPGA

SpaceWire
FPGA

C&DH

Instruments

LVPC

SUBSYSTEMS
(ACS, PSE,
PRO/DEP)

Unsw. +28V

Backplane

HGA

Hi-Rate
Tlm
125Mbps
(Max.)

S-Xpndr

Ka-Xmtr

HGA
Gimbals

Low-Rate
Tlm 2Mbps Max
& Command 4Kbps

UnSw. +28V (SBC)

1553
Summit

5 Heater out
Unsw.+28V

Sw. +28V (Ka-Comm)

UnSw. +28V (S-Comm)

+3.3V (B), +5V (B)

+/-15V, +5V, +3.3V (A)

I/O

( A)

(B)

Sw. +28V (Heater)

2 Mbps Max. (HK Downlink)

2 Mbps Max. (LAMP Tlm)

+28V Power

1PPS

6U-cPCI

GD-DDA

ATA IF

#Changed

cPCI Backplane

823 W orbit average @ 35V
Battery: Lithium Ion Chemistry
80

Amp-Hour Capacity
Data Storage Capacity: 400 Gb
Data Rate: 100 Mbps Down – Ka Band
2.186 Mbps Up/Down – S Band
Timing relative to UTC: 3ms
Delta V Capability: 1326 m/sec
Pointing Accuracy: 60 Asec relative to GCI
Pointing Knowledge: 30 Asec relative to GCI

LRO Overview
6 Instruments and 1 Technical Demonstration
3 Spacecraft Modules – Instrument, Propulsion, Avionics
2 Deployable Systems – High Gain Antenna, Solar Array
2 Data Buses – Low Rate 1553, High Rate Spacewire
2 Comm Links – S Band, Ka Band
Monopropellant System – Hydrazine, Single Tank design

servants & 23 support contractor at present (FTEs &

WYEs)
Project level augmentations in-work as Program/Project resources are phased out.

Project infrastructure in-place
Project organization and staffing being adjusted in reaction to RLEP transfer to ARC

Project Plan drafted for November 2004 Program review
Currently being revised to reflect RLEP move to ARC & to comply with NPR 7120.5 rev. C

Mission SRR successfully conducted August 16-17

Major system trades nearly complete
C&DH Architecture✔
Propulsion System ✔
Ground Network ✔
Data Recorder Technology ✔
High Accuracy Tracking Methodology ✔

Level 2 & Level 3 Requirements established and moving thru review/approval cycles – SRR successfully completed


Overall integrated mission development schedule developed and in review
Baselined after PDR in preparation for Confirmation

designs converging to preliminary designs
Design efforts primarily focused

in two areas
Design modifications to adapt to LRO command/data interfaces
Design modifications driven by lunar thermal environment
Low lunar polar orbit is significantly different than Mars missions
where most instrument heritage is from.
Interfaces with spacecraft well defined – ICDs in review/release cycle
Allocations released and agreed upon
LRO Payload Science Working Group formed and functioning
Consists of PI’s lead by LRO Project Scientist
Integral part of LRO mission operations planning

Spacecraft bus – AO design concept evolving to preliminary design
All subsystems on track for mission PDR this Fall
Propulsion subsystem moved in-house at GSFC – leverages HST-DM surplus hardware
Spacecraft Computer specified and under development on ESES contract
SQ-RAID (hard disk) technology selected for data recorder. Acquisition now in-work.
Subsystem technical Peer Review being conducted Sept. - November
Approximately $15M in direct procurements planned during Sept.-Dec.
Ground Systems – architecture and acquisition approach defined
Mission Operations Center
Preliminary design established based on GSFC heritage systems
Location established, initial facility agreements in-place
Ground Network
Requirements and architecture established
Primary 18m antenna procurement contract in place
GSFC Ground Networks providing end-to-end system
Development tasks on NENS contract established
SRR Planned for November

very successful
Review covered development and flow down of level

2 and 3 requirements from the NASA ESMD Level 1 requirements
Instruments presented flow down of Level 1 measurement and data product requirements to their level 2 and 3 performance and functional requirements
Project presented flow down of level 2 and 3 mission, spacecraft, and ground system requirements
~ 50 RFAs/Comments, none specific to instruments.
Level 1 requirements being refined by ESMD with Project and assistance.
Ongoing work includes establishment of Mission Success Criteria
SRR demonstrated that instrument requirements are established, understood, and realizable.

Spec
Thermal Spec
LRO Mission Requirements
Document
431-RQMT-000004





Level 2
Performance & SOC
Requirements
Level 2

Requirement Synthesis

Instrument Proposals & LRO AO/PIP
+
Instrument Questionnaires
+
Instrument-Project TIMs
+
Instrument Accommodation Review
+
Mission Trade Studies
+
Collaborative Drafting of ICDs

Instrument interface requirements
& constraints on spacecraft

Spacecraft and Ground Requirements

Operations

Contamination

Radiation

Mission Assurance

LOLA

LROC

LAMP

LEND

CRaTER

Diviner

Project Requirements

Measurement Requirements &
Instrument Specific Expected Data Products

Spacecraft, Instrument & Ground
Level 3 Requirements Documents & ICDs

Preliminary Engineering

Launch Vehicle

SRR
Requirements Definition & Preliminary Design
Level 1
Requirements
Baselined
LEND US-Russian
Implementing Agree

draft into HQ-State
Dept. review.

10/05

11/05

12/05

IPDRs

Mission PDR

IBR

NAR

Baseline Establishment

Phase C/D/E

Ground SRR