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相干积累与非相干积累简介
相干积累原理
非相干积累原理
MATLAB代码示例及仿真结果
%use thsi figure to generate Fig. 1.21 of textclear allclose allnp = linspace(1,10000,1000);snrci = pulse_integration(4,94.e9,47,20,290,20e6,7,10,5.01e3,np,1);snrnci = pulse_integration(4,94.e9,47,20,290,20e6,7,10,5.01e3,np,2);semilogx(np,snrci,'k',np,snrnci,'k:')legend('相干积累','非相干积累')gridxlabel ('积累的脉冲数');ylabel ('SNR - dB');function [snrout] = pulse_integration(pt, freq, g, sigma, te, b, nf, loss, range,np,ci_nci)snr1 = radar_eq(pt, freq, g, sigma, te, b, nf, loss, range) % single pulse SNRsnr1=0if (ci_nci == 1) % 相干积累snrout = snr1 + 10*log10(np);else % 非相干积累if (ci_nci == 2)snr_nci = 10.^(snr1./10);val1 = (snr_nci.^2) ./ (4.*np.*np);val2 = snr_nci ./ np;val3 = snr_nci ./ (2.*np);SNR_1 = val3 + sqrt(val1 + val2); % 等式 1.87 of textLNCI = (1+SNR_1) ./ SNR_1; % 等式 1.85 of textsnrout = snr1 + 10*log10(np) - 10*log10(LNCI);endendreturn
