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how do I create a Sensor object which has a Rectangular 100x100 deg field of view? Note, this is the actual field of view; Rectangular Sensors are defined in STK by vertical and horizontal half-angles.

I want to know how to convert from actual FOV to half angles.

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    $\begingroup$ Can you add some information? Where exactly in STK are you entering this information? Can you add a screen shot or section number in the documentation? It's a big package and it has many versions, so also please indicate the version number. Thanks! $\endgroup$
    – uhoh
    Mar 25 at 23:00
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If your field of view defined as a typical solid angle, as shown on Wikipedia, then you'd define the half angles as the half of 100x100: 50x50.

STK (and probably other modeling tools) accounts for the visibility of a sensor using a dual-conic model similar to an eclipsing model when assuming spherical celestial objects.

Am I missing something?

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    $\begingroup$ I'm a user of STK. @ChrisR is correct, a rectangular FOV of 100x100 would be captured in STK as a half angle sensor of 50x50. Vertical and horizontal are referenced relative to the orientation of the sensor on the body frame (NOT relative to a horizon). $\endgroup$
    – Carlos N
    Mar 25 at 22:57

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