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Proceedings Paper

Random-phase radar waveforms with shaped spectrum
Author(s): A. W. Doerry; B. Marquette
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Paper Abstract

A random phase signal will also have random phase differences between two independent random phases. A phase increment across a time increment is in fact a phase-rate, or frequency. A phase-rate change is in fact a frequency-hop. By controlling the phase-rate, that is the characteristics of the phase increments, we can control the spectrum of the random-phase waveform. Spectrum precision and sharpness is enhanced by holding a frequency for some ‘chip’ length. For digitally generated phase samples, this means that the chip length needs to be many samples. This is a time-bandwidth issue. The definition of ‘many’ will depend on the sharpness desired, but often several tens’ of samples will be adequate. To shape the Energy Spectral Density (ESD) of a random-phase signal, we need to control the average energy at various phase-rates. This can be done with either or a combination of 1) Controlling the likelihood of specific phase increments, and/or 2) Controlling the duration of a specific phase increment chip length. For range-Doppler images, it is the 2-dimensional Impulse Response (IPR) that is of principal concern. This will tend to average out the random effects of any single pulse.

Paper Details

Date Published: 31 May 2013
PDF: 13 pages
Proc. SPIE 8714, Radar Sensor Technology XVII, 87141G (31 May 2013); doi: 10.1117/12.2015326
Show Author Affiliations
A. W. Doerry, Sandia National Labs. (United States)
B. Marquette, General Atomics Aeronautical Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 8714:
Radar Sensor Technology XVII
Kenneth I. Ranney; Armin Doerry, Editor(s)

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