Abstract
Atmospheric models based on surface measurements of pressure, temperature, and relative humidity have been used to increase the laser ranging accuracy by ray tracing. Atmospheric refraction can cause significant errors in laser ranging systems. Through the present research, the atmospheric effects on the laser beam were investigated by using the principles of laser ranging. Atmospheric correction was calculated for 0.532, 1.3, and 10.6 micron wavelengths through the weather conditions of Tehran, Isfahan, and Bushehr in Iran since March 2012 to March 2013. Through the present research the atmospheric correction was computed for meteorological data in base of monthly mean. Of course, the meteorological data were received from meteorological stations in Tehran, Isfahan, and Bushehr. Atmospheric correction was calculated for 11, 100, and 200 kilometers laser beam propagations under 30°, 60°, and 90° rising angles for each propagation. The results of the study showed that in the same months and beam emission angles, the atmospheric correction was most accurate for 10.6 micron wavelength. The laser ranging error was decreased by increasing the laser emission angle. The atmospheric correction with two Marini-Murray and Mendes-Pavlis models for 0.532 nm was compared.
Highlights
Through the laser range finding systems, the distance was calculated by computation of the round-trip time of emitted beam and reflected from the target
Calculations were done for three laser beam emission angles, that is, 30, 60, and 90 degrees
One can see from (4) and results show that the atmospheric effects (AC) value obviously depends on the laser wavelength, emission angle, and propagation path length
Summary
Through the laser range finding systems, the distance was calculated by computation of the round-trip time of emitted beam and reflected from the target. The atmosphere through the most recent models has been assumed to be symmetric and spherical to simplify the calculations of range finding and delay caused by atmosphere In these models, horizontal gradients in atmosphere index of reflection would be ignored because it led to error less than a centimeter in angels less than 10 degrees [2]. Many models have been developed to correct laser range measurements because of mean atmospheric index of refraction. The atmospheric measuring data resulting from range finding sites were used through the mentioned models and their accuracy received a few centimeters at 20 degrees. To achieve a real value of the distance between ground site and target, the error value has been calculated and encountered in the final measurement due to atmospheric effects (AC). The real meteorological data of the above mentioned states was used
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