Sunset and Sunrise

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kahta
Posts: 571
Joined: Sat Sep 21, 2019 6:42 pm
Location: Arkansas

Sunset and Sunrise

Post by kahta »

I've searched the forums and manual and can't seem to find anything on this question: Is there any penalty to visual or sensor detection when the object being detected is approaching from the direction of the sun? For example: Would IR sensors be less effective if the target was approaching from the east during sunrise?
Nikel
Posts: 3403
Joined: Tue Mar 24, 2009 10:51 am

Re: Sunset and Sunrise

Post by Nikel »

This P Gatcomb video may be useful.


https://www.youtube.com/watch?v=o4bPT47vuK8


Edit: no. Your particular question is not covered. Just the amount of light.
Quark73
Posts: 384
Joined: Fri Nov 04, 2022 2:55 pm
Location: Baltic Coast

Re: Sunset and Sunrise

Post by Quark73 »

kahta wrote: Wed Jun 12, 2024 2:23 am I've searched the forums and manual and can't seem to find anything on this question: Is there any penalty to visual or sensor detection when the object being detected is approaching from the direction of the sun? For example: Would IR sensors be less effective if the target was approaching from the east during sunrise?
IMHO this should be only a problem in a very narrow sector, if the object has almost same direction and azimuth as the sun.
But there is another effect during dusk and dawnthat reduces IR sensors, called thermal crossover. Usually a landscape consists of objects with different heating properties. Some heat faster some slower, some keep the heat some cool fast. When the sun starts or stops shining (and heating) this leads to phase where many objects have almost the same temperature. And you just have a grey soup on IR screen. This is especially hated by the heli guys and girls, because they travel usually pretty close to the ground.
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