Graduate Thesis Or Dissertation

 

The use of electromagnetic Walsh waves in radar Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9z9032801

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  • The question of the suitability of Walsh functions or similar bi-valued functions used as a radar electromagnetic carrier waveform is considered. Walsh functions are described and effective sinusoidal steady state transfer functions are defined for transmission elements, antenna systems, and propagation media. The argument is made that the unit impulse response is suitable in describing the responses of radar elements and the propagation media to such bi-valued excitation waveforms. A measure of the mean, or average, duration of the unit impulse response is defined and used as a measure of the degradation of rise and fall times introduced by radar system elements and the radar environment. It is shown that the mean duration of the impulse response may be easily obtained from the Laplace or Fourier transfer function of an element without resorting to time-domain evaluation cf that quantity. From transfer functions defined, for transmission elements, antennas, and propagation media, corresponding unit impulse responses are obtained for many typical elements useful in the implementation of a Walsh carrier radar. Approximate limitations are foud on the maximum suitable transmission distances that may be expected when using a transmission line to transmit Walsh waves as well as the distances over which a propagation medium will have negligible effect. The conclusion obtained is that radar system elements and the radar propagation medium are compatible to the use of Walsh functions as the functional form of the electromagnetic carrier wave if sound judgement is used.
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