On HF communication link parameter estimation in the Baltic regionLossmann, Eerik; Meister, Mari-Anne; Madar, Urve2011 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (IEEE APWC '11) : Torino, Italy, September 12-16, 2011 : proceedings2011 / p. 812-814 : ill https://ieeexplore.ieee.org/document/6046802