Attenuation, cont.

An expression for the attenuation is:

					(1)

where k is a measure of the amount of attenuation (attenuation factor)

[k] = 1/L

Taking Dr = dr and P_r-P₀ = dP₀

Then (1) becomes:

			(2)

Integrating the left-hand side gives:

 		(3)

where the exponential term is the attenuation factor which we will define as:

			(4)

Substituting (3) into the radar equation gives:

		(5)