Astro-satpass

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eg/xml  view on Meta::CPAN

__END__

=head1 TITLE

xml - Represent a series of ISS passes in XML

=head1 SYNOPSIS

 eg/xml
 eg/xml '06-Jun-2011 noon CET' 3 -time_zone GMT
 eg/xml -help
 eg/xml -version

=head1 OPTIONS

The following options are recognized:

=over

=item -latitude

lib/Astro/Coord/ECI.pm  view on Meta::CPAN

Geocentric to Geodetic Coordinates", at
L<http://www.astro.uni.torun.pl/~kb/Papers/geod/Geod-BG.htm>,
was used for transforming geocentric to geodetic coordinates.

Dominik Brodowski (L<https://www.brodo.de/>), whose SGP C-lib
(available at L<https://www.brodo.de/space/sgp/>) provided a
reference implementation that I could easily run, and pick
apart to help get B<Astro::Coord::ECI::TLE> working. Dominik based
his work on Dr. Kelso's Pascal implementation.

Felix R. Hoots and Ronald L. Roehric, the authors of "SPACETRACK
REPORT NO. 3 - Models for Propagation of NORAD Element Sets,"
which provided the basis for the Astro::Coord::ECI::TLE module.

T. S. Kelso, who compiled this report and made it available at
L<http://celestrak.org/>, whose "Computers and Satellites" columns
in "Satellite Times" magazine were invaluable to an understanding
and implementation of satellite tracking software, whose support,
encouragement, patience, and willingness to provide answers on arcane
topics were a Godsend, who kindly granted permission to use his
azimuth/elevation algorithm, and whose Pascal implementation of the

lib/Astro/Coord/ECI/TLE.pm  view on Meta::CPAN

Beginning with release 0.056_01, loading JSON TLE data which specifies
C<SATNAME> produces a warning the first time it happens. As of version
0.061 there is a warning every time it happens. As of version 0.066
loading JSON TLE data which specifies C<SATNAME> is a fatal error. Six
months after this, all code referring to C<SATNAME> will be removed,
meaning that the key will be silently ignored.

=head1 DESCRIPTION

This module implements the orbital propagation models described in
"SPACETRACK REPORT NO. 3, Models for Propagation of NORAD Element Sets"
and "Revisiting Spacetrack Report #3." See the
L<ACKNOWLEDGMENTS|/ACKNOWLEDGMENTS> section for details on these
reports.

In other words, this module turns the two- or three-line element sets
available from such places as L<https://www.space-track.org/> or
L<http://celestrak.org/> into predictions of where the relevant orbiting
bodies will be. Additionally, the pass() method implements an actual
visibility prediction system.

lib/Astro/Coord/ECI/TLE.pm  view on Meta::CPAN

places, but it does not follow that the models are correspondingly more
accurate when implemented in Perl. My understanding is that in general
(i.e. disregarding the characteristics of a particular implementation of
the models involved) the total error of the predictions (including error
in measuring the position of the satellite) runs from a few hundred
meters to as much as a kilometer.

I have no information on the accuracy claims of SGP4R.

This module is a computer-assisted translation of the FORTRAN reference
implementations in "SPACETRACK REPORT NO. 3" and "Revisiting Spacetrack
Report #3." That means, basically, that I ran the FORTRAN through a Perl
script that handled the translation of the assignment statements into
Perl, and then fixed up the logic by hand. Dominik Borkowski's SGP C-lib
was used as a reference implementation for testing purposes, because I
didn't have a Pascal compiler, and I have yet to get any model but SGP
to run correctly under g77.

=head2 Methods

The following methods should be considered public:

lib/Astro/Coord/ECI/TLE.pm  view on Meta::CPAN

=head1 ACKNOWLEDGMENTS

The author wishes to acknowledge the following individuals.

Dominik Brodowski (L<https://www.brodo.de/>), whose SGP C-lib
(available at L<https://www.brodo.de/space/sgp/>) provided a
reference implementation that I could easily run, and pick
apart to help get my own code working. Dominik based his work
on Dr. Kelso's Pascal implementation.

Felix R. Hoots and Ronald L. Roehric, the authors of "SPACETRACK
REPORT NO. 3 - Models for Propagation of NORAD Element Sets,"
which provided the basis for the Astro::Coord::ECI::TLE module.

David A. Vallado, Paul Crawford, Richard Hujsak, and T. S. Kelso, the
authors of "Revisiting Spacetrack Report #3", presented at the 2006
AIAA/AAS Astrodynamics Specialist Conference.

Dr. T. S. Kelso, who made these two key reports available at
L<http://celestrak.org/NORAD/documentation/spacetrk.pdf> and
L<http://celestrak.org/publications/AIAA/2006-6753/> respectively. Dr.

t/tle_pass.t  view on Meta::CPAN

	deg2rad( 23.774 ),
	76.86 * PARSEC,
	deg2rad( -0.0461 * 24 / 360 / cos( $ra ) / SPY2DPS ),
	deg2rad( -0.00957 / SPY2DPS ),
	4.3,
    );
};

# The following TLE is from
#
# SPACETRACK REPORT NO. 3
#
# Models for Propagation of
# NORAD Element Sets
#
# Felix R. Hoots
# Ronald L. Roerich
#
# December 1980
#
# Package Compiled by

xt/author/pod_spelling.t  view on Meta::CPAN

SIGINT
SIMBAD
Simbad
simbad
Sinnott
SKYSAT
skysat
SLALIB
Smart's
solstices
SPACETRACK
Spacetrack
specular
Starlink
STDERR
Steele's
Steffen
Stellarium
Storable
strasbg
subclasses