Conjecturing a bit, it's possible that the Daqi-1/AEMS system was not in its nominal mode based on Eubanks' information. Perhaps its operators were trying out a different duty cycle for some unknown-to-us reason. In regular RADAR systems, long pulse-lengths lead to range-folding issues where the detector is still receiving reflections from the previous pulse when the next transmission begins. The photos I saw of the Daqi-1 system imply a long transmit time. Without knowing how far away the light-fan was from the camera which took the picture, it may be difficult to tell just how long the "on" phase was. We do have ways to calculate the angular rate of Daqi-1, at least. However, that may still not explain all of why a relatively simple camera was able to capture the light-fan. John On 3/4/2023 10:14, Marshall Eubanks via Seesat-l wrote: > On 2023-03-03 14:53, Jim Blackhurst via Seesat-l wrote: >> I was reading again today about the sighting of green laser beams, as >> recorded by a webcam at the Subaru Telescope in Hawaii. It's now widely >> acknowledged that this was caused by the ACDL (LIDAR) instrument of the >> Chinese satellite Daqi-1/AEMS. >> >> Sightings of the lasers used in satellite-based Lidar are amazingly >> rare, > ... _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Mon Mar 06 2023 - 10:20:03 UTC
This archive was generated by hypermail 2.4.0 : Mon Mar 06 2023 - 16:20:03 UTC