I guess that you have the rotor on a moveable platform such as a truck, spacecraft. watercraft, etc.
The look angle to the fixed object is the reciprocal of the angle generated by the tracking program.
It should work if the antennas are mounted 180 degrees from where they would normally be mounted.
73 Glenn WB4UIV
At 05:13 AM 08/13/07, Eric Fort wrote:
at certain times I would like an automated az-el rotor run by predict to "track" a fixed point on earth, say for instance a local mountain top. could a set of keps be derived such that this just looks like yet another satellite? How would this be done? Is there an easier way?
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The antennas in this case are fixed, though a movable solution would be nice. the problem is how to get the tracking program to point the antennas at a fixed spot and keep them pointed there. I'm considering the assembly of a sat-gate that will do double duty on sats and terrestrial work so the antennas need to be able to "track" both types of targets. notice the quotes around "track"...ultimately I'd like to just specify an oblect (norad catalogue number or lat/lon) remotely and have the antennas point and remain pointed at the object as my station and/or the remote station (object) moves. Im thinking to just have the tracking program pull the right set of keps....but I need to create them first! I'm also open to ways to do this in ways that may be easier. suggestions are welcome.
Eric
On 8/13/07, Glenn Little WB4UIV glennmaillist@bellsouth.net wrote:
I guess that you have the rotor on a moveable platform such as a truck, spacecraft. watercraft, etc.
The look angle to the fixed object is the reciprocal of the angle generated by the tracking program.
It should work if the antennas are mounted 180 degrees from where they would normally be mounted.
73 Glenn WB4UIV
At 05:13 AM 08/13/07, Eric Fort wrote:
at certain times I would like an automated az-el rotor run by predict to "track" a fixed point on earth, say for instance a local mountain top. could a set of keps be derived such that this just looks like yet another satellite? How would this be done? Is there an easier way?
KG6KQT _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
I've never used Predict for tracking, but most rotor control programs allow you to specify a set of fixed coordinates to "park" the antenna. Maybe something like that would work for you? 73, Jim KQ6EA
--- Eric Fort eric.fort@gmail.com wrote:
The antennas in this case are fixed, though a movable solution would be nice. the problem is how to get the tracking program to point the antennas at a fixed spot and keep them pointed there. I'm considering the assembly of a sat-gate that will do double duty on sats and terrestrial work so the antennas need to be able to "track" both types of targets. notice the quotes around "track"...ultimately I'd like to just specify an oblect (norad catalogue number or lat/lon) remotely and have the antennas point and remain pointed at the object as my station and/or the remote station (object) moves. Im thinking to just have the tracking program pull the right set of keps....but I need to create them first! I'm also open to ways to do this in ways that may be easier. suggestions are welcome.
Eric
On 8/13/07, Glenn Little WB4UIV glennmaillist@bellsouth.net wrote:
I guess that you have the rotor on a moveable
platform such as a truck,
spacecraft. watercraft, etc.
The look angle to the fixed object is the
reciprocal of the angle
generated by the tracking program.
It should work if the antennas are mounted 180
degrees from where they
would normally be mounted.
73 Glenn WB4UIV
At 05:13 AM 08/13/07, Eric Fort wrote:
at certain times I would like an automated az-el
rotor run by predict to
"track" a fixed point on earth, say for instance
a local mountain top.
could a set of keps be derived such that this
just looks like yet another
satellite? How would this be done? Is there an
easier way?
KG6KQT _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed
are those of the author.
Not an AMSAT-NA member? Join now to support the
amateur satellite
program!
Subscription settings:
http://amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
On Mon, 13 Aug 2007 13:30:19 -0700 "Eric Fort" eric.fort@gmail.com wrote:
The antennas in this case are fixed, though a movable solution would be nice. the problem is how to get the tracking program to point the antennas at a fixed spot and keep them pointed there. I'm considering the assembly of a sat-gate that will do double duty on sats and terrestrial work so the antennas need to be able to "track" both types of targets. notice the quotes around "track"...ultimately I'd like to just specify an oblect (norad catalogue number or lat/lon) remotely and have the antennas point and remain pointed at the object as my station and/or the remote station (object) moves. Im thinking to just have the tracking program pull the right set of keps....but I need to create them first! I'm also open to ways to do this in ways that may be easier. suggestions are welcome.
Eric
What you want to do is not possible with a satellite tracking program. Keplerian elements describe the orbit of a satellite and where the satellite is at a given time on this orbit. From this information, a satellite tracking program calculates the position of the satellite at any given time. Therefore, you would have to define an orbit, where the satellite appears to be stationary and has practically zero altitude. This is not possible because a satellite only appears stationary at very high altitudes (e.g. geostationary orbit at 35600 km above Earth surface) and the orbital velocity increases as the altitude decreases. In fact, it doesn't even make much sense to talk about satellite orbits at altitudes less than 100km above the Earth.
I think you will have more luck if you try to find another software for this task; something that simply points your antenna to a fixed direction.
73 Alex OZ9AEC
participants (4)
-
Alexandru Csete -
Eric Fort -
Glenn Little WB4UIV -
Jim Jerzycke