Time-frequency mapping of the positional characteristics of single- and multimode wave beam at the lengthy atmospheric path outputTatiana Arsenyan, Eugeniy Babanin, Vitaliy Kapranov, Rinat Stryungis, Natalia Suhareva and Vjatcheslav TugaenkoEPJ Web Conf., 161 (2017) 02003DOI: https://doi.org/10.1051/epjconf/201716102003