Graphics Programs Reference
In-Depth Information
L NCI
=
1.057 dB
(1.116)
Then, the net non-coherent integration gain is
NCI gain
=
10
×
log
()
–
1.057
=
7.394 dB
NCI gain
=
5.488
(1.117)
Thus, the radar detection range is now improved due to a 7-pulse non-coherent
integration to
) 0.25
R a
=
78
×
(
5.488
=
119.38 Km
(1.118)
) 0.25
R m
=
48
×
(
5.488
=
73.467 Km
Again, the extent of the elevation search volume is changed to
2
73.467
----------------
θ 1
=
atan
=
1.56°
(1.119)
It follows that the search volume
(in steradians) is now
θ 2
–
θ 1
13.13
–
57.296
1.56
-----------------------
------------------------------
=
360
×
=
360
×
=
1.269
steradians
(1.120)
) 2
) 2
(
57.296
(
1.10. MATLAB Program and Function Listings
This section presents listings for all MATLAB functions and programs used
in this chapter. Users are encouraged to vary the input parameters and rerun
these programs in order to enhance their understanding of the theory presented
in the text. All selected parameters and variables follow the same nomenclature
used in the text; thus, understanding the structure and hierarchy of the pre-
sented code should be an easy task once the user has read the chapter.
Note that all MATLAB programs and functions developed in this topic can
be downloaded from CRC Press Web Site Ðwww.crcpress.comÑ. Additionally,
all MATLAB code developed for this topic was developed using MATLAB 6.5
Release 13 for Microsoft Windows.
Listing 1.1. MATLAB Function Ðradar_eq.mÑ
function [snr] = radar_eq(pt, freq, g, sigma, te, b, nf, loss, range)
% This program implements Eq. (1.56)
c = 3.0e+8; % speed of light
lambda = c / freq; % wavelength
p_peak = 10*log10(pt); % convert peak power to dB
lambda_sqdb = 10*log10(lambda^2); % compute wavelength square in dB
sigmadb = 10*log10(sigma); % convert sigma to dB
four_pi_cub = 10*log10((4.0 * pi)^3); % (4pi)^3 in dB
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