Lunar Prospector Ground Operations System

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Lunar Prospector Ground Operations System

• System/Software Design Document
• Group 3 Science Data Center
• April 20, 1998

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Introduction

• What is the moons history?
• What is the moons surface composition?
• Is there enough water on the moon to support a
  lunar base?
• What is the moons gravity model?

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Overall Mission Objectives

• Obtain scientific data about the Moon
• Refine and extend findings from previous missions
  and analyze data that may be useful to future
  missions
• Implement the Discovery Program guidelines of
  cheaper, better, faster
• Innovative education and outreach programs

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SDC Objectives

• Secure storage of LP mission data
• Process and manage raw LP mission data
• Provide data interface and delivery to SDC end
  users

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System Context
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System Design

• LPGOS Subsystems
• External System Interfaces
• Intra-Subsystem Interfaces

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Subsystem Hardware Design

• Science Data Archive
• NSSDC
• Science Teams Ground Station
• Public Web Server

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Subsystem Software Design
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Design Structure

• LP Data Switch Manager
• Science Data Archive Object
• Science Teams/Ground Station Interface Object
• NSSDC Interface Object
• Public Web Server Object

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Design Structure Object Overview
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LP Data Switch Manager

• Purpose Manage interface between LP Data Switch
  and SDA
• Attributes - Dynamic, permanent, private
• Hardware Dedicated processor
• Storage Tape archive for raw data, other caches

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Science Data Archive Object

• Purpose - Manage all LP mission data
• Attributes - Static, persistent, public
• Hardware - Dedicated processor
• Storage - Database indices and records on disk
• I/O CDF records

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Science Teams/Ground Station Interface
Object

• Purpose Manage interface between Science
  Team/Ground Station and SDA
• Attributes - Static, permanent, public
• Hardware Dedicated database request server

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NSSDC Interface Object

• Manages interface between SDA and NSSDC
• Dynamic
• Permanent
• Hardware - Workstation, Network Connection, CD
  Burner

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NSSDC State Diagram
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Public Website Object

• SDA database
• Image Assembly
• Web Server

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Image Assembly State Diagram
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Public Website Image Assembly Object

• Query database
• Call Unix graphing program
• Wait and update

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Image Assembly Activity Diagram
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Interfaces LP Data Switch

• Communication Method network
• Hardware ATM connection
• Data Format JP Raw Data Format
• Data Frequency 3600 bps continuous

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Hardware Design Constraints

• All servers must be Unix-based
• Image development on NT workstations
• Internal networks Fast Ethernet or better

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Software Design Constraints

• Use COTS software whenever possible
• Use GNU C for custom software
• Web server must be Apache HTTP server
• Web pages must be Netscape 3.0 compat.

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Requirements Tracibility Matrix
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Requirements Tracability Matrix
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Conclusions and Questions

• Questions?
• Additional diagrams and information refer to
  http//students.cec.wustl.edu/tmpsp295/