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I see some asking about capabilities and such - well there's a bunch of (satellite-borne) sensors for detecting ships - SAR - Optical - NRD - LIDAR - AIS /
by TrackerFF 2y ago
I see some asking about capabilities and such - well there's a bunch of (satellite-borne) sensors for detecting ships
- SAR
- Optical
- NRD
- LIDAR
- AIS / VMS / LRIT
etc.
Truth be told, detection tends to be a fusion of sensors. When it comes to non-cooperative objects, sensors like SAR, Optical, NRD, LIDAR are often used. NRD sensors detect ship navigation radar on S- and X-band, while LIDAR detects light from ships. Optical and SAR everyone knows.
- dzhiurgis 2y agoI don't think LIDAR works from satellite, the distances is just too high.
- dr_orpheus 2y agoIt's not that it doesn't work, it is just prohibitively hard. The other comments here pointed out GEDI which is a LIDAR payload on the ISS. But it's resolution is only 25 m. This is compared to the resolution of the Umbra satellites of ~0.5-1m. So with something like GEDI you could see large ships. But you would need a larger telescope and/or more powerful laser to get better resolution.
- dzhiurgis 2y agoBiggest drawback is atmosphere - doesn’t work with cloud cover.
- AnarchismIsCool 2y agoThere are absolutely LIDAR sats. Amateur astronomers occasionally get pictures of the beams sweeping around with high sensitivity cameras.
- barbegal 2y ago[dead]
- is_true 2y agohttps://gedi.umd.edu/instrument/instrument-overview/ https://gedi.umd.edu/instrument/instrument-overview/