Abstract
At present, robotic ultrasonic radars are used only for small distances and with low resolution and great sensitivity to parasitic echo. This article shows some ways to increase the sensitivity and resolution of targets in the viewing environment. This is achieved by three basic ways. On the one hand, special noise analysis enables optimum design of input circuits for input noise reduction by 20–30 dB over standard solutions. This will allow for a considerably higher basic radar range. Another benefit is the DSP for the received signal, which allows a continuous evaluation of the amplitude and phase of this signal by Fourier analysis, coupled with additional digital filtration. This makes it possible to evaluate the reflection distance with more than 1 lambda precision. The third benefit is the use of at least pairs of sensors both horizontally and vertically. Vertical phase evaluation of the received signals will allow, in addition to higher vertical resolution, suppression of parasitic echo from the ground. Horizontal amplitude-phase evaluation along with the phase control of the pair of exciters will substantially increase the resolution of the targets in the observed environment at a broader viewing angle. It is possible to arrive at a system that produces a fairly accurate ultrasonic image of the surroundings of the radar.
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Hájek, K. (2019). Increased Sensitivity of Ultrasonic Radars for Robotic Use. In: Mazal, J. (eds) Modelling and Simulation for Autonomous Systems. MESAS 2018. Lecture Notes in Computer Science(), vol 11472. Springer, Cham. https://doi.org/10.1007/978-3-030-14984-0_11
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