phadet.m

此程序给出了不同情况的雷达距离测量仿真平台

% Active Phased Array Detection Range
% Against Low RCS Targets
% ----------------------------------------

clear;clc;clf;

% Antenna Effective Aperture

Ar=5;	         % sq. m

% Enter Frequency Range

fmin=1;fmax=10;
f=fmin:fmax;

% Enter Radar Parameters
% Swerling Case 0 Target

ts=1;	        % Search Frame Time - s
RCS1=.1;      % Radar Cross-Section - sq. m
RCS2=.01;     % Radar Cross-Section - sq. m
RCS3=.001;    % Radar Cross-Section - sq. m
ang=1;        % Search Coverage - steradians
k=1.38e-23;   % Boltzman's Constant - w/(Hz-Ko)
NF=3;	        % Receiver Noise Figure - dB	
Sa=13;        % SNR for Pd=.9;Pfa=1e-6 - dB
Ls=10;        % System Losses - dB
eff=.7;       % Antenna Aperture Efficiency

F=10^(NF/10);Sa=10^(Sa/10);Ls=10^(Ls/10);

% Find System Noise Temperature

Ts=293*(F-1)+150;

% Assume Linear Increase of 2 w Module Power
% Inversely Proportional to Frequency at 10 GHz

Pm=2*10./f;    % watts

% Find Number of Modules with wl/2 Spacing

wl=.3./f;
n=sqrt(Ar)./(wl/2);

% Find Average Power

Pa=Pm.*n.^2;

% Compute Missile Detection Range

R1=(Pa*Ar*ts*RCS1/(4*pi*ang*k*Ts*Sa*Ls)).^.25;
R2=(Pa*Ar*ts*RCS2/(4*pi*ang*k*Ts*Sa*Ls)).^.25;
R3=(Pa*Ar*ts*RCS3/(4*pi*ang*k*Ts*Sa*Ls)).^.25;

% Plot Range vs Frequency

plot(f,R1/1000,f,R2/1000,f,R3/1000);grid;
ylabel('Range - km');
xlabel('Frequency - GHz');
title(['Active Aperture Phased Array Detection Range']);
text(6.5,70,'RCS = 0.001 sq. m');
text(4,110,'RCS = 0.01 sq. m');
text(1.5,160,'RCS = 0.1 sq. m');