Ham radio: Meteor Scatter Propagation

Meteor Scatter propagation uses FSK441 protocol, which is one of the modes included in the WSJT suite.
from wiki:

"Using phase-steerable antennas directed at the proper area of the sky for any given time of day (the direction where the Earth is moving "forward"), data rates can be greatly improved, averaging 4 kilobits per second (kbit/s). "
"FSK441, introduced in 2001 as the first communications mode included with WSJT, is designed to support communication using streaks of radio-reflecting ions created in the ionosphere by the trails of meteors.
The bursts of signal created by such trails are commonly referred to as “pings”, due to their characteristic sound. Such pings may be as short as a tenth of a second and carry enough information to complete at least one stage of a contact.
FSK441 employs multi-frequency shift keying using four tones, at a data rate of 441 baud. Because of the choice of character codes in the protocol, it is self-synchronizing and does not require an explicit synchronization tone.
FSK441 is generally used on the 2-meter and 70-centimeter amateur bands. Contacts may be made at almost any time (that is, a meteor shower is not required to be in progress) at distances of up to 1400 miles (2250 km).
When transmitted messages include at least one space, the FSK441 decoding algorithm uses that space character as a syncword for zero-overhead synchronization.[2]:30[6](12.2)

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