3 ms·
Sure. You can also do radio moonbounce, which radio hams routinely do.[1] About 2.5 secs of lag. It takes a sizable antenna. You could probably use that as a de
by Animats 2y ago
Sure. You can also do radio moonbounce, which radio hams routinely do.[1]
About 2.5 secs of lag. It takes a sizable antenna. You could probably use that as a delay line. Noisy, so error correction will be necessary.
Laser moonbounce is harder to do than radio.[2] Early systems used so much laser power that they had to be equipped with radars to turn the system off if aircraft were in the area. Later systems with safer lasers could detect single photons with a 40cm telescope and transmit a 2KHz signal.
[1] https://en.wikipedia.org/wiki/Earth%E2%80%93Moon%E2%80%93Earth_communication https://en.wikipedia.org/wiki/Earth%E2%80%93Moon%E2%80%93Ear...
[2] file:///home/john/Downloads/SLR2000_Eyesafe_and_autonomous_single_photoelectro.pdf
- IIAOPSW 2y agoThis seems more like the airplanes problem than my problem...
- LegionMammal978 2y agoWould you have a working link to that second PDF?
- Animats 2y agoHere are some SLR2000 papers that are more easily accessible.[1][2] Doing this with low-power lasers requires rather good receiving optics. There has been a major breakthrough in laser data transmission - the first cat video has been sent by laser to and from a spacecraft. "At the time, Psyche was traveling 19 million miles (31 kilometers) from Earth, about 80 times the distance between Earth and the Moon. Traveling at the speed of light, the video signal took 101 seconds to reach Earth, sent at the system’s maximum bit rate of 267 megabits per second."[3] [1] https://ilrs.gsfc.nasa.gov/lw15/docs/papers/SLR2000,%20The%20Path%20toward%20Completion.pdf https://ilrs.gsfc.nasa.gov/lw15/docs/papers/SLR2000,%20The%2... [2] https://ilrs.gsfc.nasa.gov/lw13/docs/presentations/adv_degnan_1p.pdf https://ilrs.gsfc.nasa.gov/lw13/docs/presentations/adv_degna... [3] https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/ https://arstechnica.com/space/2023/12/a-cat-video-highlighte...
- actionfromafar 2y agoRadio link?