search

filipsPL / autowx2

The program for scheduling recordings and processing of the satellite and ground radio transmissions (like capturing of the weather APT images from NOAA satellites, voice messages from ISS, fixed time recordings of WeatherFaxes etc.) :earth_africa: :satellite:
78 stars 16 forks source link

Update update-keps.sh #16

Closed SA7BNT closed 5 years ago

SA7BNT commented 5 years ago

Add TLE download https://www.amsat.org/amsat/ftp/keps/current/nasa.all

filipsPL commented 5 years ago

This new TLE file has an "old" version of NOAA satellites spelling (i.e., "NOAA-15" with dash). That's why we have to adjust configs and README.md to this option too.

What is the advantage of using this source of data?

For future reference, info from their webpage:

Two Line Elements or TLEs, often referred to as Keplerian elements or keps in the amateur community, are the inputs to the SGP4 standard mathematical model of spacecraft orbits used by most amateur tracking programs. They specify the size and shape of the orbit, and how the orbit is oriented with respect to the Earth at a particular moment in time. With the TLEs, and your station location, you can compute when the satellite will be in view and where to point your antennas. See the tutorial on Keplerian elements and the explanation of the formats used in these files. Details of the mathematics behind these elements may be found in Spacetrack Report No. 3 and Revisiting Spacetrack Report #3.

Weekly updates are completely adequate for most amateur satellites. A significant exception is the International Space Station. Because of its low orbit, it experiences significant aerodynamic drag which over a few days introduces noticeable errors, particularly for the 2395 MHz HamTV transmissions that require narrow beamwith dish antennas for good reception. Additionally, its orbit is periodically raised by thrusters. These combined factors require frequent updates to ensure accurate predictions. To satisfy this requirement, AMSAT updates the bare elements file several times daily based on data provided by NASA’s Johnson Space Flight Center.