The use of several channels of signals formation is necessary for modulation of the ultra-wideband probing signal
(from two signals with a carrier [f.sub.c] and modulating [f.sub.m] frequencies) and generating the output signal of the heterodyne for the transceiver module with a frequency [f.sub.h].
For a correct simulation of the probing signal
propagation in the insulation of the power cable characteristic impedance is accepted equal to 57.5 [ohm].
Energy enhancement is possible by increasing the amplitude of the probing signal
or its duration .
Tomography is generally defined as the process of plane- wise imaging the internal properties of a subject using various types of probing signal. A complete tomography system consists of the processes of energizing from a source measurement data acquisition and data inversion (image reconstruction).
Then there are different types of tomography based on the choice of the probing signal (modality) e.g.
Electrical tomography having probing signal frequency in GHz range is considered separately as microwave tomography.
Xie, "On probing signal design for MIMO radar," in Proceedings of the 40th Asilomar Conference on Signals, Systems, and Computers, pp.
Xie, "On probing signal design for MIMO radar," IEEE Transactions on Signal Processing, vol.
The main idea of these approaches is to design the proper probing signals according to the desired transmit beampattern.
The electromagnetic probing signal
will react strongly with the conducting material and readily disclose the cave structure.
"While probing signals
in the area, we spotted foreign and enemy drones which attempted to enter the area of the war game.
Emphasis is placed upon the ability of MIMO systems to transmit beyond single waveforms and to freely choose between multiple probing signals