Kylymnyk A. IImproving the accuracy of radar sounding of subsurface objects using multifrequency phase radar

The thesis is devoted to theoretical and applied research on improving the accuracy and resolution of radar subsurface probing. Analysis methods ranging revealed that the phase methods is the most accurate, but they have a significant drawback - the lack of resolution. Its overcoming is possible using of multifrequency phase methods. Further work is dedicated to the improvement of analytical methods multi-phase measurement range. Found analytical expressions, allowing separate harmonic signals reflected from different objects. Found analytical expressions that establish the relationship between measurement range and accuracy parameters forming device signals and measurement of their parameters. The method of clarifying the measurement result subsurface depth of objects that is consistent finding permittivity and attenuation coefficients of each subsurface layer that allows finding the speed of propagation of radio waves in each layer and calculating true phase shift of the reflected signals. Also suggested to use a grid frequency of uneven step that ensures uniform growth phase shifts due to significant frequency dependence of relative permittivity. The block diagram of radar subsurface probing system using multiphase method that can measure the coordinates of subsurface objects. A simulation model, which allows calculating the total value of the reflected signals with regard to various electrical parameters of layers of subsurface environments. Multi-phase method Research subsurface probing possible to verify the proposed research in the position. In addition, to test scientific statements, developed and manufactured laboratory studied the layout and laboratory bench multiphase ranging facilities.