Some quick and basic explanations:
The ESA-Dresden Trainer applet is a simulation of the real software
to control the telescope. With the exception of a few options, it
works in the same way and with the same speed.
The applet is organized in several pages which are accessed by the
top buttons. They are
The following steps guide you to some basic operations:
- Operate is the main page to orient the telescope
and to take measurements
- Skyview presents a view of the sky, with the actual
positions of the Sun, the Moon, and the Clarke Belt of
geostationary satellites (the blue curve)
- Spectrum here we can scan through the frequencies
- Scan permits to take measurements while scanning
an arc in the sky (Please note: this works OK in the simulation, but
due to the limited stability of its positioning system we
can not perform this with the real instrument)
- Map would scan a rectangular region in the sky to
make a radio image (Again, this feature works well only
in the simulation!)
- Pos.Calib. permits to properly align the real
telescope with the help of observations of geostationary
satellites (This feature has no use or meaning in the
simulation ... but as operating this page would upset
the position indications, do not do anything here!)
- Settings allows to change the parameters of
the telescope, such as the geographical location of the
observing site ... There are also some parameters whose
change would not be meaningful for the simulation)
- Output is a feature of the Trainer applet only.
Here we can grab the recorded measurement data, which
is normally written into a file.
- Exit has no meaning for the applet
- clicking Startup System allows operations
- several Buttons permit to orient
the telescope: goto Calibrator
goto Astra 1 will start the repositioning.
Sun now, Sun+15min, Moon now,
Moon+15min will only display the positions of
the bodies at this moment or where they will be in
- The current position is indicated in the two fields
for Azimuth and Elevation in the centre. Below are
the corresponding fields to enter a desired position.
The button Goto will start the movement.
Please note that while the numbers are given with
one decimal place, the accuracy of the real positioning
is only 1 degree, with other deviations on top!
This is also the reason that the new position reached
may not be exactly the desired position.
- (The display of "our Az/EL" are for checking and maintenance
- (In the real instrument, we can change the frequency and the
polarization. In the simulation there is no effect!)
- Instead of recording one measurement at a time, there
is an option to take the average over several measurements.
(this is rarely used in normal operations!)
- single measmt. displays one single measurement, e.g.
- Start, Stop, Resume
control the measurements and their recording.
In the real telescope Stop+Finish is used to
finish with the current file.
- As long as the measurements take place, we cannot change
the vertical scale of the chart display by using the scroll
bars on its left. But we can Stop the measurements
briefly, adjust the display to our wishes, and then
Resume the measurements.
- The main chart gives a tracing of the signal strength as
a function of time. To its right a bargraph gives an analog
display of the current measurement, whose value is also
- SkyView page shows the sky above the telescope:
there are a few features (buildings, trees) which limit
the view of the horizon. The light blue area is the region
into which the telescope is permitted to be operated.
Sun, Moon, and the flux calibrator source are marked
by symbols. The present position is indicated by a small
cross. The blue curve marks the Clarke Belt of geostationary
satellites: as these constitute strong emission in the 10 GHz
band, it is not advisable to try to observe the Moon when
it is close to the Belt.
- The yellow fields on the left are buttons to change the
time of the display, and of the operation of the telescope.
Thus it is possible to simulate observations at other
- Clicking on the display will cause this position's coordinates
to be displayed on the right hand side. Clicking on the yellow
Goto field will cause the telescope to move to this
- Output is a text window, into which the ongoing
measurements are recorded. This is in the same format as the
text files from the real telescope. These data can be
simply copied and pasted into a text editor and then stored
into a file on your own computer.
- Clicking a Start button will wipe the previous data
and start to fill this window with the current data.
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last update: May 2011 J.Köppen