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16 votes

Stealth In Space Calculator

What you need to compute is how many photons hit the entrance pupil of the camera in the allowable exposure time. This is one place where the field of view of the camera comes into play. The entire ...
AlexP's user avatar
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14 votes

Stealth In Space Calculator

1. SNR to exposure time Although your mileage may vary depending on the details of your detector, you can take an approach similar to deriving what is known as the CCD equation. It's derived for the ...
HDE 226868's user avatar
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5 votes
Accepted

Sky color other than blue

No That hard-science tag is ruthless. There's no room for equivocation. Purple, yellow... such skies cannot exist in a human-habitable context. First of all, you have a problem with how humans ...
JBH's user avatar
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3 votes

Stealth In Space Calculator

NETD vs Pixels I think I worked it out. Thermal sensors basically work like cameras; so, to figure out how much I can see in 360 degrees, I first need to figure out how many pixels it would take to ...
Nosajimiki's user avatar
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3 votes

Stealth In Space Calculator

This is a Frame Challenge A quick note: a question I asked on Astronomy, which wasn't well received, does make a few good points that are brought up here. You're detecting light in the infrared ...
JBH's user avatar
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1 vote

Stealth In Space Calculator

Rd = ( 17.8E6 * sqrt( MsAsIsp(1-Nd)(1-Ns) ) ) I hate creating what is basically a copy paste answer but the link is buggy and the relevent part is buried, but it covers everything. So I included all ...
John's user avatar
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1 vote

Stealth In Space Calculator

Let us start with the measurements of the cosmic background as measured by the ESA Planck spacecraft. This mapped variations in the cosmic background. The CMB has a thermal black body spectrum at a ...
Richard Kirk's user avatar
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