obtaining a plurality of channel measurements for at least one Wireless Access Point (WAP), wherein the plurality of channel measurements include Line of Sight (LOS) signal measurements and Non-LOS (NLOS) signal measurements of the at least one WAP;

determining, based on WAP almanac information and the plurality of channel measurements for the at least one WAP, at least one corresponding set of channel parameters, wherein the channel parameters are indicative of positions of a plurality of signal sources relative to a previous position information of a User Equipment (UE), wherein one or more signal sources in the plurality of signal sources is a virtual signal source associated with the NLOS signal measurements;

associating the plurality of signal sources with corresponding channel parameters in the at least one corresponding set of channel parameters;

determining, based on the previous position information of the UE and the association of the plurality of signal sources with the corresponding channel parameters, a current position information of the UE; and

updating the WAP almanac information based on position information of at least one signal source in the plurality of signal sources, a signal blockage probability of the at least one signal source, and an antenna geometry for the at least one signal source.