## A technique for identifying pilot describing functions from routine flight-test records |

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actual system actual value appendix autocorrelation function bias Bode plot computer processing constant gain control loop controlled element correlation cross-correlation function cross-power spectrum describing func dynamics effective time delay equation 17 error contribution error in identification error term estimated describing function estimated Tp example experimental data external disturbance feedback control figure 16 fit term flight data Fourier transform frequency domain function from routine identifying the pilot impulse response function input signal internal noise source k=kr l/Yc(joj measured describing function measured transfer function measurement methods Minimum phase NASA noise n(t phase angle physically realizable pilot describing function pilot model pilot/control describing function presented in figure previous studies rad/sec Figure realizable systems reduces the identification reduction in identification Ren(T represents retrofire retrorockets Rnn(T ROUTINE FLIGHT-TEST RECORDS shown for comparison shown in figure simulated spectrum of e(t theory tion tracking task white noise Yc(jw Ym(jw Yp(joo Yp(ju Yp(jw zero