blob: 8c14ef9b1c6a4ad83b027826372b4c21364faa53 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
//Chapter 17: Antenna Temperature, Remote Sensing and Radar Cross Section
//Example 17-1.2
clc;
//Variable Initialization
eff_aper = 500 //Antenna effective aperture (m^2)
wave_lt = 20e-2 //Wavelength (m)
Tsky = 10.0 //Sky temperature (K)
Tgnd = 300.0 //Ground temperature (K)
beam_eff = 0.7 //Beam efficiency (unitless)
aper_eff = 0.5 //Aperture efficiency (unitless)
//Calculations
phy_aper = aper_eff/eff_aper //Physical aperture (m^2)
diam = 2*sqrt(phy_aper/%pi) //Antenna diameter (m)
diam_l = diam/wave_lt //Antenna diameter (lambda)
ta_sky = Tsky*beam_eff //Sky contribution to antenna temp. (K)
ta_side = 0.5*Tsky*(1-beam_eff) //Side-lobe contribution to antenna temp. (K)
ta_back = 0.5*Tgnd*(1-beam_eff) //Back-lobe contribution to antenna temp. (K)
Ta = ta_sky + ta_side + ta_back
//Result
mprintf("The total antenna temperature is %.1f K", Ta)
|
