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Sep24-10, 03:36 PM
P: 38
I'm trying to figure out the structure of this equation. So, to calculate the power density at the receiver we would use the following formula:

PDr = PDs/ 4 pi R^2

To remove compound errors, we need to account for all the variables over a given distance. Thus, for every meter, we need to account for additional sources of loss (ASL):

PDr = (PDs /4 pi R^2) - ASL

Thus, we can wrap this up in a function and use a lookup table to calculate the losses over a location in 3D space as so:

PDr = f(PDs, distance)

So, rewriting to solve for distance, the formula is:

Distance = f (PDr, PDs)

and the function has a lookup table for the specific loss over a 3D area. We could also use a rough trilateration first to determine which elements of the lookup table to include. This would be useful in a satellite scenario where the atmosphere is in one direction and space in the other, as these vectors will have different associated losses.

Anyone see any problems so far?