Recovered post:

Good morning.
We are currently defining our Telescope system (our plan is to buy it this year). It is really interesting your work related with the optical camera for aircraft security. So we will have it into consideration for our system (in addition with ads-b, flarm, all-sky camera, directional microphone...).
Best regards.
serna_yebes

Today, while writing my own CRD-parsing python3 code, I felt a little bit wheel-reinventing

Since the new CRD/CPF format is going to release at the Canberra meeting, I guess it's time to think about our new CRD2.0 python library?
It should have following functions: verify the CRD2.0 format, extract data, etc.

I found in GitHub the CRD/CPF library from Olli Wilkman:

https://github.com/dronir/SLRdata

Could be a good start.

Recovered Post:

Hi Arttu,
in Graz we are using (since delivery of the laser) a Lauda chiller. LAUDA ecoline RE110
Cooling power @20° = 500W; Heating power = 1500W;
We have a filter of 100µm at the output (renewing once a year). And we changed the position of the temperature sensor from internal (chiller reservoir) to the output tube of the laser for having shorter warm up times. As a “descaler” we are adding OptiShield to the distilled water. This mixture we are renewing around every 5 to 10 years but we have to add around half a litre of distilled water every week. (losing a lot ??) By the way, beside some very short service periods, we never switched the HQ-Laser system off.
Greetings, Franz

Dear Jose,

I didn't check the forum for a while, however I made a comparison between the formula I found on some Arnold's papers and the one I was using, here are the results:

Peak           Arnold     my simulation
distance
1-2            28.9680   24.9776
1-3          110.7177   95.8031
1-4          243.2109  211.6056
1-5          423.1052  370.6967

the new value seems to reproduce correctly the data from RETRO. Now I'll try to see what can I do on the peak intensities.

Thanks again

Daniele

Serna Yebes

I think that all participants on the Networks and Engineering Standing Committee Forum will agree on the following points:

•   The coordinates and in particular the height difference between the barometric sensor in use and the telescope invariant point should be included, measured and known in the local geodetic network.

•   The sensors (and in particular the barometer, which is the most difficult to calibrate “in situ”) should be calibrated periodically, (how we define “periodic” will be another looooong discussion).

•   What is now the sampling data rate of the current Yebes meteorological station?
Most SLR and GPS stations works at 10 minutes (at sharp second) sampling rate.
Remember that the pressure resolution asked is 0.1 milibar, and most of time, the pressure change rate in 10 minutes is less or equal than that.

•   The meteodata should be time tagged and available immediately at the local network, not only the last measurement done, but also the proceeding ones.

•   This is because the best practice is to include both pre- and post- meteorological values on the Normal point and this Normal Point file should be generated and delivered as soon as possible.
But if you do the “batch filtering” every few hours, you need to have access to the data of at least the last couple of days (to have a monthly file is a good compromise)

•   If the “local microclimate” at Yebes is (more or less) the same at the meteorological and SLR places, for example both places are surrounded by grass, this distance is not a problem.
In Riga we are using a common meteorological station at a distance of 32m (GPS) and 50m (SLR)

•   Do the current meteorological station has an anemometer?
Do you have strong winds at Yebes?
Because for really strong winds, automatically closing the roof/cupola/clamshell will be a good security measure against flying objects.
At the new buildings at GFZ Potsdam, all the windows have external Venetian blinds connected to a central anemometer. When the wind reaches a limit all the blinds are automatically lowered to protect the windowpanes

•   Invest the money on the best clarity/rain sensor in which the rain/snow alarm can be used to automatically close the SLR roof AND on a high quality all-Sky camera!
When several satellites are visible and it is partially cloudy, the all-Sky camera is the best tool for the on-the-spot tracking optimization.

And if you have a LOT of money project, and buy the independent, well calibrated SLR basic meteorological station situated at the SLR invariant height, no one at the SLR community will complain!.