Orbital Map Projection for Mission Control Center

Map Projection for Satellites

For circle orbits ( Iorb - inclination, Torb – period)

X = C * L
dY/dPhi = C * sqrt( cos(Phi)^-2 + cos(Iorb)^-2 – 2 * Torb / (Tearth *
cos(Iorb) ) )

Possible: if PhiIorb
dY/dPhi = const = C * sqrt( cos(Iorb)^-2 + cos(Iorb)^-2 – 2 * Torb /
(Tearth * cos(Iorb) ) )

X, Y – map coordinates
L, Phi – longitude, latitude

Such map has property: equal paths (on map and on surface of sphere)
for equal times.

Example (Torb=90 minutes)
Iorb=51.6 (ISS) http://programtree.com/map51or.gif
Large BMP file(1920*1920) http://programtree.com/map51.bmp

Iorb=28.5 (Cape Canaveral) http://programtree.com/map28or.gif
Large BMP file(1920*1480) http://programtree.com/map28.bmp

schreef :
Map Projection for Satellites

For circle orbits ( Iorb - inclination, Torb – period)

X = C * L
dY/dPhi = C * sqrt( cos(Phi)^-2 + cos(Iorb)^-2 – 2 * Torb / (Tearth *
cos(Iorb) ) )

Possible: if PhiIorb
dY/dPhi = const = C * sqrt( cos(Iorb)^-2 + cos(Iorb)^-2 – 2 * Torb /
(Tearth * cos(Iorb) ) )

X, Y – map coordinates
L, Phi – longitude, latitude

Such map has property: equal paths (on map and on surface of sphere)
for equal times.

Example (Torb=90 minutes)
Iorb=51.6 (ISS) http://programtree.com/map51or.gif
Large BMP file(1920*1920) http://programtree.com/map51.bmp

Iorb=28.5 (Cape Canaveral) http://programtree.com/map28or.gif
Large BMP file(1920*1480) http://programtree.com/map28.bmp

For this I use a 'simple' program 'Orbitron' (www.stoff.pl)
Others use NOVA for the same purpose...

Andre scribbled something like ...

schreef :
Map Projection for Satellites
[...]

Such map has property: equal paths (on map and on surface of sphere)
for equal times.
[...]
For this I use a 'simple' program 'Orbitron' (www.stoff.pl)
Others use NOVA for the same purpose...

Does Orbitron or NOVA have the equal paths for equal times property? Or is
it just a convenient copy of the traditional NASA Mission Control screen?

/dps

Snidely schreef :
Andre scribbled something like ...

schreef :
Map Projection for Satellites
[...]

Such map has property: equal paths (on map and on surface of sphere)
for equal times.
[...]
For this I use a 'simple' program 'Orbitron' (www.stoff.pl)
Others use NOVA for the same purpose...

Does Orbitron or NOVA have the equal paths for equal times property? Or is
it just a convenient copy of the traditional NASA Mission Control screen?

/dps

Those programs can calculate/predict where certain satellites are at a
given time (correct element sets are required).
Also they can calculate where the given sats are at this moment.
I must say Orbitron is pretty accurate.

=?ISO-8859-15?Q?Andr=E9,_PE1PQX?= scribbled
something like ...

Snidely schreef :
Andre scribbled something like ...

schreef :
Map Projection for Satellites
[...]

Such map has property: equal paths (on map and on surface of
sphere) for equal times.
[...]
For this I use a 'simple' program 'Orbitron' (www.stoff.pl)
Others use NOVA for the same purpose...

Does Orbitron or NOVA have the equal paths for equal times property?
Or is it just a convenient copy of the traditional NASA Mission
Control screen?

Those programs can calculate/predict where certain satellites are at a
given time (correct element sets are required).
Also they can calculate where the given sats are at this moment.
I must say Orbitron is pretty accurate.

Which indeed is useful. But the question is about the *projection*,
which is a map-making term. Comes in flavors like "ortho-something",
"isoconic", "Mercator", etc. So the programs you mention ... the map
they display ... what is the projection used, and does it have the EP for
ET property?

(You can run the calculations for satellite tracking without any map
being displayed, and have those calculations be quite accurate ... and
for some purposes, more useful than a map display ... but we still want
to discuss *projections*.)

/dps

http://i287.photobucket.com/albums/l...t/Orbitron.jpg

Here a screenshot of Orbitron. ISS is at the beginning of the stracks
displayed, calculated with the most recent Keppler elements available.
In the lower richt corner a radar-display will appear if a satellite is
in (visible) range of the location of your choice (location of my
choice is my home town Emmen, NLD).

Hope it helps...