|
Freq=[10e6::1e6::75e6] 1 R/ y9 V' v, x+ M: T
b1=2e-5 4 A9 K3 G8 y' C8 V* y" Z4 U: v
b2=1.1e-10
8 u3 w/ l: u6 n) w, Gb3=3.2e-20
+ t8 b7 b% J0 [2 u9 }b4=1.2e-40 4 x# I E, X2 H1 o& U
e=2.71828 . ~7 `3 Y! K) M
ILpcb(f)=0.3*[20*lg(e)*(b1*(power(f,1/2)+b2*(power(f,1)+b3*(power(f,2)+b4*(power(f,3)] : Z, H0 b! ? n' S) e/ U
. z# C( O% z2 |8 b# n' k! M" r( J0 s
A=12-2*POWER(f,1/2)
2 [. n; N; R% T9 `9 q1 gB=6.3-13*lg(f/5.5)
" {6 J. ]2 _1 {, J8 A- zRL=if(freq<4.1)then a else b / a$ Q2 n, a. R7 l3 ^
" e8 R7 T6 Z4 v6 y) w
- m% k: r @4 E( p; [
可以参照这个写 |
|