Preliminary development of digital signal processing in microwave radiometers
William D. Stanley, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, Langley Research Center
National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1980 - Technology & Engineering - 142 pages
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aliasing analog signal analog system analysis approximately attenuator bilinear transformation block diagram Bode plot closed-loop component continuous-time control loop corresponding critically damped damping factor determined Dicke frequency Dicke switch digital signal-processing directional coupler discrete-time duty cycle effect equation equivalent noise bandwidth error to changes estimation circuit feedback radiometer figure A-2 frequency domain point harmonics injected noise input temperature integrator Jeffords lag-lead network lead time constant loop filter loop gain maximum overshoot mean value microwave radiometer noise diode notch filter number of points Nyquist rate Old Dominion University optimum output variance parameters point of view post-loop filtering POST-LOOP SAMPLES power spectrum PROPOSED DESIGN rad/s range reduced reference noise represents ripple level Run 1 Run sampled signal SAMPLES IN AVERAGE sampling rate second-order loop settling shown in figure simple lag network SIMULATION OF PROPOSED statistically independent steady-state sum-and-dump algorithm Temperature Estimates underdamped undersampling yi(i z-transform zero