The Slant Range using Vectors calculator computes the slant range (R) from a ground station to an object (satellite or aircraft) based on the station and object position vectors.
INSTRUCTIONS: Enter the following:
- (PG) Ground Station Position Vector (kilometer units)
- (PV) Vehicle Position Vector (kilometers units)
Slant Range (R): The range is returned in kilometers. However this can be automatically converted to compatible units via the pull-down menu.
The Math / Science
The formula for the slant range uses both the law of sines and the law of cosines. In the obtuse triangle below:
- b = Re + sA
- a = Re + oA
- c is the slant range
- CA is the Earth Central Angle
- BA is the subtended angle (β)
- AA is elevation angle (α) + 90°
Law of Sines:
` a/(sin("AA")) = b / (sin("BA")) = c / (sin("CA"))`
Law of Cosines:
`c = sqrt( a^2 + b^2 - 2a*b*cos(CA) )`
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