fig1_20.m
上传用户:szahd2008
上传日期:2020-09-25
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- % Use this program to reproduce Fig. 1.19 of text.
- close all
- clear all
- pt = 10e03; % peak power in Watts
- freq = 5.6e+9; % radar operating frequency in Hz
- g = 20; % antenna gain in dB
- sigma = 0.01; % radar cross section in m sqaured
- b = 5.0e+6; % radar operating bandwidth in Hz
- nf = 3.0; %noise figure in dB
- loss = 8.0; % radar losses in dB
- Ti = 2; % time on target in seconds
- dt = .05; % 5% duty cycle
- range = linspace(10e3,225e3,1000); % range to target from 10 Km 225 Km, 1000 points
- snr1 = hprf_req (pt, Ti, g, freq, sigma, .05, range, nf, loss);
- snr2 = hprf_req (pt, Ti, g, freq, sigma, .1, range, nf, loss);
- snr3 = hprf_req (pt, Ti, g, freq, sigma, .2, range, nf, loss);
- % plot SNR versus range
- figure(1)
- rangekm = range ./ 1000;
- plot(rangekm,snr3,'k',rangekm,snr2,'k -.',rangekm,snr1,'k:','linewidth',1.5)
- grid
- legend('dt = 20%','dt = 10%','dt = 5%')
- xlabel ('Detection range - Km');
- ylabel ('SNR - dB');