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Web Services for Satellite Emulation Development. Kathy J. Liszka Allen P. Holtz The University of Akron NASA Glenn Research Center. Motivation. Support an emulation of space-based Internet architectures backbone network formation clusters Constellations

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Web services for satellite emulation development

Web Services for Satellite Emulation Development

Kathy J. Liszka Allen P. Holtz

The University of Akron NASA Glenn Research

Center


Motivation
Motivation

  • Support an emulation of space-based

    • Internet architectures

    • backbone network

    • formation clusters

    • Constellations

  • Provide a web-based architecture for remote access and control of a multi-user, distributed system.


Complex Multi-satellite

Emulation Scenarios


NASA Satellite emulation test bed

Experimenter Site

Internet

Experimenter Site

Experimenter Site


Data format
Data Format

  • Need computational methods for efficient data:

    • access

    • sharing

    • information extraction

  • SGML

  • XML

    • simple

    • well-documented data

    • straightforward format

    • text


Xml document creation
XML document creation

  • Microsoft Word

    • create template with formats that map to your XML data

    • save in RTF format

    • RTF → XML converter

  • applications with DOM parser

  • JAVA API

  • XSLT stylesheets


User input to the emulation
User input to the emulation

  • reduce human error

  • user-friendly interface

  • automatically encode data into an XML document

    • well-formed

    • complete

  • web-based


Xsmiles
XSmiles

  • An official W3C recommendation.

  • Delivers a pure Java  XML browser.

  • Capable of displaying documents written in various XML languages.

  • Supports:

    • XSL Transformations (XSLT)

    • XSL Formatting Objects (XSL FO)

    • Synchronised Multimedia Integration Language (SMIL) 

    • XForms

    • XHTML

    • X3D

    • Scalable Vector Graphics (SVG)

  • Allows rich multimedia content, such as video and audio, and streaming of it. 


Xforms emulation interface
XForms emulation interface

  • separates data from the web-page

  • data content derived from forms is stored in XML (developer defined) format

  • forwarded as a stream of Unicode bytes

  • platform independent


Xml file
XML File

<my>

<Scenario_Name>Scenario_one.xml</Scenario_Name>

<Facility>

<Instrument>

<IPAddress>127.0.0.1</IPAddress>

<Data_Rate>1000</Data_Rate>

</Instrument>

<Location>

<Latitude>

<Degrees>45</Degrees>

<Minutes>24</Minutes>

</Latitude>

<Longitude>

<Degrees>34</Degrees>

<Minutes>29</Minutes>

</Longitude>

</Location>

</Facility>

</my>


XML

XHTML

<?xml version="1.0" encoding="ISO-8859-1"?>

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

<xsd:element name="my">

<xsd:complexType>

<xsd:sequence>

<xsd:element name="Scenario_Name" type="xsd:string"/>

<xsd:element name="Password" type="xsd:string"/>

<xsd:element name="Facility" minOccurs="1">

<xsd:complexType><xsd:sequence>

<xsd:element name="Instrument" minOccurs="1">

<xsd:complexType><xsd:sequence>

<xsd:element name="IPAddress" type="xsd:string"/>

<xsd:element name="Data_Rate" type="xsd:decimal"/>

<xsd:element name="Bit_Error_Rate" type="xsd:decimal"/>

</xsd:sequence></xsd:complexType>

</xsd:element>

<xsd:element name="Location">

<xsd:complexType><xsd:sequence>

<xsd:element name="Latitude">

<xsd:complexType><xsd:sequence>

<xsd:element name="Degrees" type="xsd:float"/>

<xsd:element name="Minutes" type="xsd:float"/>

</xsd:sequence></xsd:complexType>

</xsd:element>

<xsd:element name="Longitude">

<xsd:complexType><xsd:sequence>

<xsd:element name="Degrees" type="xsd:float"/>

<xsd:element name="Minutes" type="xsd:float"/>

</xsd:sequence></xsd:complexType>

</xsd:element>

</xsd:sequence></xsd:complexType>

</xsd:element>

</xsd:sequence></xsd:complexType>

</xsd:element>

</xsd:sequence>

</xsd:complexType>

</xsd:element>

</xsd:schema>

XForms

XML Schema

XSmiles


Emulation scenario
Emulation Scenario

  • Satellite & ground stations

  • Run-time control

  • Orbital parameters

  • Network routes

  • Interface bandwidths

  • Delay

  • Bit error rates






<?xml version="1.0" encoding="ISO-8859-1"?>

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

<xsd:element name="my">

<xsd:complexType>

<xsd:sequence>

<xsd:element name="Scenario_Name" type="xsd:string"/>

<xsd:element name="Password" type="xsd:string"/>

<xsd:element name="Facility" minOccurs="1">

<xsd:complexType><xsd:sequence>

<xsd:element name="Instrument" minOccurs="1">

<xsd:complexType><xsd:sequence>

<xsd:element name="IPAddress" type="xsd:string"/>

<xsd:element name="Data_Rate" type="xsd:decimal"/>

<xsd:element name="Bit_Error_Rate" type="xsd:decimal"/>

</xsd:sequence></xsd:complexType>

</xsd:element>

<xsd:element name="Location">

<xsd:complexType><xsd:sequence>

<xsd:element name="Latitude">

<xsd:complexType><xsd:sequence>

<xsd:element name="Degrees" type="xsd:float"/>

<xsd:element name="Minutes" type="xsd:float"/>

</xsd:sequence></xsd:complexType>

</xsd:element>

<xsd:element name="Longitude">

<xsd:complexType><xsd:sequence>

<xsd:element name="Degrees" type="xsd:float"/>

<xsd:element name="Minutes" type="xsd:float"/>

</xsd:sequence></xsd:complexType>

</xsd:element>

</xsd:sequence></xsd:complexType>

</xsd:element>

</xsd:sequence></xsd:complexType>

</xsd:element>

</xsd:sequence>

</xsd:complexType>

</xsd:element>

</xsd:schema>

XML Schema


Scenario submission

CGI program

XML

Scenario Submission

Internet

SOAP

SOAP


SOAP

  • Simple Object Access Protocol

  • XML-based protocol.

  • Used for interoperability.

  • Defines the use of XML and HTTP to access services, objects, and servers in a platform-independent manner.


Future work
Future Work

  • XLINK

    • basis for graphs

    • providing a semantic representation of the objects defined in the form and their relationship to each other

  • SVG

    • Language for describing two-dimensional graphics in XML.

    • Can be interactive and dynamic.

    • Animations can be defined and triggered either declaratively or scripted.

  • Multimedia streaming content


Internet

XLINK

XForms

Streaming

Multimedia

SVG


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