ELECTRON TUBE RESEARCH.
Abstract
A pulse-modulated oscillator was built to simulate the effects of fading on a Barker code over the entire range of fading rates of interest. The measured bandwidth of the time-variable attenuator is compared. The results of measurements of the composite system to determine its linearity are given. The degradation caused by a time-varying channel in the performance of a coded-pulse radar is studied. An expression is found for the degradation, averaged over an ensemble of coded-pulse radar systems, of a channel modeled as a zero-mean, homogeneous, random, time-variant linear filter. Pseudo-periodic codes of short period are examined. A criterion for selecting best binary codes is described. The differential equation representing the optimum class of signals for high resolution radars is solved for a different class of endpoint conditions. The subclass of two input signals is solved and proved to be optimum. The purpose of this study is to obtain improved algorithms for numerical evaluation of uncertainty and ambiguity functions of discrete, amplitude-phase modulated signals. In this report the problem is formulated and an algorithm for the Fourier cosine transform, which results from linear approximation of the phase modulation, is derived. A cathode-coupled monostable multivibrator is designed to give an output of square pulses with a duration of nanoseconds. Metal-ceramic 7077 triodes are used as the switching elements. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1965
- Accession Number
- AD0478459
Entities
People
- N. Declaris
Organizations
- Cornell University College of Engineering