Nonlinear transformations of pulse signals in the radiotomography

This paper considers two possibilities for using nonlinear time transformations of short ultra-wide-band (UWB) pulses to improve the visibility of hidden objects in location radio tomography. The first approach is related to the allocation of a digital coherent jitter, which is formed in the result of a special nonlinear signal transformation. The resulting increase in the contribution of high-frequency components of the reflected signal spectrum provides an improvement in the spatial resolution of images of hidden objects. The second approach is to use additional relatively powerful monochromatic wave illumination in tactile mode to locate the target. This causes a characteristic distortion of the probing pulse radiation in the case of reflection from nonlinear radio-electronic elements that are part of the probed target. The observed change in the shape of the pulse signal allows selective tomography of nonlinear radio-electronic elements. The aim of this work is to reveal new possibilities of pulse tomography. Given in the examples show that the described non-linear transformation of the form of signals significantly improve the performance of conventional pulse radiotomography.

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