A radar system may comprise a trigger, driver, switching circuit, and antenna for generating an ultra-short impulse without utilizing an oscillator. A radar imaging system for imaging a formation or a cross section of a pipeline may include at least one radar sensor. The system may transmit a high-frequency, short impulse signal to a formation or pipeline and measure a reflected signal. A high speed impulse generator may allow the short impulse signals to be generated. This impulse generator may utilize a switching circuit and digital driver to provide the short impulse signals. The images provide useful information about complex permittivity of the formation, the geometry of the pipeline, deposition thickness of asphaltenes and wax, velocity of the fluid, as well as size, type, concentration of gas bubbles, water, or solid particles in the flow, or combinations thereof.