E.V. Mitrofanov - Post-graduate Student, Trainee-researcher, Kotel\'nikov IRE of RAS (Moscow). E-mail: mitrofanov_ireran@mail.ru V.A. Cherepenin - Dr. Sc. (Phys.-Math.), Professor, Corresponding Member of RAS, Kotel\'nikov IRE of RAS (Moscow), Faculty of Physics, Lomonosov Moscow State University. E-mail: cher@cplire.ru

The use of probe signals with wide and ultrawideband frequencies allows constructing new high informative radiolocation systems. The bandwidth of such signals can be in the range of hundreds megahertz to several gigahertz. Radio/video pulses of nanosecond duration can be used as probe signals for ultrawideband radiolocation systems. However using of such small duration has the series of shortcomings: small energy of transmitted signal; complexity in construction high power pulse generators with nanosecond duration, etc. These shortcomings can be overcome using multifrequency probe signals. In this paper the experimental radar model which utilizes quazicontinuous monochrome probe signals tuned in steps in ultrawideband frequency is developed and constructed. Radiowave imaging of urbanized area inside and outside the building are derived. Experiments on detection of unmanned aerial vehicle are conducted. The construction of experimental radar model with stepped-frequency modulation demonstrates that radiolocation systems with mul-tifrequency probe signals (with the simultaneous transmission of frequency components) can be used in urbanized area. For example they can be applied to provide traffic safety, in security systems, including people and small size drons detection.

 

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