Measuring of thickness of the asphalt pavement with Use of GPR
The results of development, tests and application of the GPR for measurement of the road asphalt layers thickness are presented in the paper. Main necessary improvements providing the possibility of use the GPR as a measuring device are described as well as some results of application of the GPR for inspection of the road structure after reparation the road. It was achieved accuracy of layers thickness measurement better than 0.5 cm.
Enlarging of power budget of ultrawideband radar
Three possible ways to enlarge power budget of ultrawideband / short pulse radar which are high decoupling between the transmitting and receiving modules of the radar antenna system, decreasing of jitter in radar subsystems synchronizing and optimizing of duration of samples in the radar stroboscopic converter are discussed. Effectiveness of their application is illustrated with theoretical and experimental data.
Third International Kharkov Symposium "Physics And Engineering Of Millimeter And Submillimeter Waves"'
Abstract : In this contribution, we present a review of the principles of holographic power combining, a new concept for power combining at millimeter and submillimeter wavelengths. This approach which Is based on the principles of holography utilizes a computer-generated hologram to transform the wavefront radiated by an array of sources into a plane wave, and establishes spatial power combining. The primary advantages of this method are its scalability up to arbitrarily high frequencies, high combining efficiency, and broad-band characteristics. Moreover, it will be shown that a holographic power combiner has a simple structure, and its design shows no dependence on the number of sources. With regard to the above mentioned advantages, this powercombining technique can replace many of the common methods of power combining and open the way to all-solid-state power sources for millimeter and submillimeter waves.