Advanced study of video signal processing in low signal to noise environments Semiannual progress report, 1967 - 1968

Parameter space calculation for phase lock loop operation in low signal to noise environmen

Advanced study of video signal processing in low signal to noise environments - Multi-filter phase-locked loop demodulation Quarterly progress report, Feb. - May 1970

Multi-filter phase locked loop demodulatio

Advanced study of video signal processing in low signal to noise environments Semiannual progress report, Jun. - Nov. 1970

Video signal processing in low signal to noise environments - bandpass filter in multi-filter phase lock loo

Inorganic analysis in a controlled ecological life support system

Techniques useful for the elemental analysis of samples of types which might require analysis within a controlled ecological life support system are investigated

Advanced study of video signal processing in low signal to noise environments Quarterly progress report, Oct. 1969 - Jan. 1970

Video signal processing in low signal to noise environment

Advanced study of video signal processing in low signal to noise environments Semiannual progress report, 1967-1968

Mathematical model for Apollo video signal processing in low signal to noise ratio environment

The FDM demodulating characteristics of non-linear phase-locked loops

FDM demodulation characteristics of nonlinear phase locked loop

Advanced study of video signal processing in low signal to noise environments

Conventional analytical techniques used to determine and optimize phase-lock loop (PLL) characteristics are most often based on a model which is valid only if the intermediate frequency (IF) filter bandwidth is large compared to the PLL bandwidth and the phase error is small. An improved model (called the quasi-linear model) is developed which takes into account small IF filter bandwidths and nonlinear effects associated with large phase errors. By comparison of theoretical and experimental results it is demonstrated that the quasi-linear model accurately predicts PLL characteristics. This is true even for small IF filter bandwidths and large phase errors where the conventional model is invalid. The theoretical and experimental results are used to draw conclusions concerning threshold, multiplier output variance, phase error variance, output signal-to-noise ratio, and signal distortion. The relationship between these characteristics and IF filter bandwidth, modulating signal spectrum, and rms deviation is also determined

A fast acting electrical servo for the actuation of full span, Fowler-type wing flaps in DLC applications: A detail design study

The philosophy and detail design of an electro-mechanical actuator for Fowler-type wing flaps which have a response time constant of 0.025 seconds are described. A conventional electrical servomotor with a power rating twice the maximum power delivered to the load is employed along with adaptive, gain-scheduled feedback and various logic circuits, including one to remove electrical excitation from the motor during extended periods when no motion of the flap is desired

The non-linear transient behavior of second, third and fourth order phase-locked loops

Non-linear transient behavior of second, third, and fourth order phase-locked loop