Web Services for Satellite Emulation Development

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3 Νοε 2013 (πριν από 3 χρόνια και 7 μήνες)

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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


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

Complex Multi
-
satellite

Emulation Scenarios


Internet

NASA Satellite
emulation test bed

Experimenter Site

Experimenter Site

Experimenter Site

Data Format


Need computational methods for efficient data:


access


sharing


information extraction


SGML


XML


simple


well
-
documented data


straightforward format


text

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


reduce human error


user
-
friendly interface


automatically encode data into an XML
document


well
-
formed


complete


web
-
based

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


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

<
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
>

XForms

XHTML

XML Schema

XSmiles

<?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

Emulation Scenario


Satellite & ground
stations


Run
-
time control


Orbital parameters


Network routes


Interface bandwidths


Delay


Bit error rates

XHTML <head> element for basic XForms

XHTML <body> element for basic XForms

XHTML <body> element for basic XForms

XHTML <body> element for basic XForms

<?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

Scenario Submission


Internet

CGI program

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


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

XForms

XLINK

SVG

Streaming

Multimedia


Internet