Maltsev V. Development of a vehicle speed and slip meter based on coherent millimeter-range radar

The object of research is the process of measuring the true speed of a vehicle and the level of wheel slip based on radar data; the purpose of the study - to develop a meter based on a millimeter-range coherent radar for measuring in real time the absolute speed and slip coefficient of vehicles; subject of research - speedometer and towing vehicle based on coherent millimeter-range radar; research methods - methods of mathematical and computer modeling, methods of spectral and statistical analysis, as well as experimental research methods in laboratory and field conditions; results -developed, manufactured and tested speed and slip coefficient meter of agricultural units based on coherent millimeter radar, which allows to optimize the speed of transport to save fuel and increase the efficiency of agricultural work through optimal dosing at sowing and application of good; novelty - for the first time a method of optimizing the technical requirements for radar to measure the true speed of vehicles; for the first time the method of laser determination of the height profile of irregularities for different types of cultivated soils for agricultural purposes was applied, which, in contrast to previous studies, were performed in order to obtain microstructural characteristics of the soil profile; developed an original method of signal processing, which allowed to implement the computer in real time on the basis of widespread microcontrollers; further developed methods for detecting the characteristics of millimeter-wave signals that are scattered on a statistically inhomogeneous surface and made from heights comparable to the size of inequality, which significantly changes the statistics of signals in contrast to previously obtained data from aerospace carriers in remote sensing; improved the method of estimating the central frequency of the spectrum and proposed a method of correcting speed measurement data based on the estimation of the energy center of gravity for quasi-stationary signals reflected from a statistically inhomogeneous underlying surface, and taking into account the presence of abnormal vehicle accelerations; the degree of implementation - the results are implemented at the Kharkiv National Technical University of Agriculture named by Petro Vasilenko.