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In this expression n is the number of measurements made to each of the four satellites, and the matrix H is given by where H1 H 2 H = , ··· Hn−1 where α11 α 21 Hk = α31 α41 α12 α13 1 kT α11 kT α12 α22 α32 α23 1 kT α21 α33 1 kT α31 kT α22 kT α32 α42 α43 1 kT α41 kT α42 kT α13 kT kT α23 kT kT α33 kT kT α43 kT k = 0, 1, . . , n − 1. The state vector X is given by X = [δx δy δz δB x˙ y˙ z˙ ˙ T, B] and e is the 4 n × 1 dimensional error vector.
Active control of turbulence is another way that is under study at the present time and for which new ideas are emerging continuously. The principle of active control is to detect the development of turbulence from the measurement of some characteristic feature—wall pressure or wall shear stress, for example—and to apply a perturbation to the flow in order to cancel this development. Up to now, these studies have been performed in the laboratory, either experimentally or numerically. In other fields, active control techniques are used in real life.
Let the carrier frequency selected by the pilot be f c . The output of the digital frequency synthesizer is e f s (t): e f s (t) = E f s sin(2π f c t). For each sinusoidal component in the voice (audio) signal at a frequency, f m , the signal from the modulator, eAM , is given by eAM (t) = E AM [1 + m sin(2π f m t + φ)] sin(2π f c t), where m (the modulation index) is proportional to the amplitude of the audio signal and m < 1. P1: FYD Revised Pages Encyclopedia of Physical Science and Technology EN001F-916 May 10, 2001 10:30 340 Aircraft Instruments Amplifier Input signal from audio panel To antenna eAM Modulator (AM) R-F amplifier fC Carrier frequency selector Digital frequency synthesizer fC – fIF R-F amplifier IF tuner and fIF amplifier fC From antenna detector and LPF Mixer To audio panel Pilot Microphone input ( ( Headphone or speakers ( Output to transmitter Audio panel ( III.