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Electronic rangefinder measurement scope in 0.10 ~ 5.00 m, 1 cm measurement precision, measurement with no direct contact with the object to be tested, able to display measurement results clear and stable. Because ultrasonic directivity is strong, energy consumption is slow, in the medium transmission distance is farther, so ultrasonic often used for distance measurement, such as range finder and level measurement instrument can be done by ultrasound. [ABSTRACT FROM AUTHOR]

The proposed work aims to improve one of the most used telemetry techniques to make absolute measurements of distance: the time of flight telemetry. The main limitation of the low-cost implementation of this technique is the low accuracy (some mm) and measurement rate (few measurements per second). In order to overcome these limits we modified the typical setup of this rangefinder exploiting low-cost telecommunication transceivers and radiofrequency synthesizers. The obtained performances are very encouraging, reaching a standard deviation of a few micrometers over the range of some meters. [ABSTRACT FROM AUTHOR]

The purpose of this paper is the comparison of two phase measurement methods commonly used in precision rangefinder systems and their suitability to work with high frequency signals. Basic detection circuits for an FFT and an IQ-based methods were proposed and hardware limitations were considered. A set of simulations to assess the behavior of the algorithms in the presence of the noise was performed. An influence of the ADC resolution on the measurement accuracy was also assessed. It is proved that the IQ-based method shows better resilience to signal distortions and puts lower requirements on the ADC circuit thus is better suited for real time high resolution laser rangefinders. [ABSTRACT FROM AUTHOR]