摘要：Vector t rack ing in GNSS receiv- ers is based on the idea that instead of tracking each s atel- lite's signal separ ately, all signals are ultimately related to the position and velocit y of t he user antenna and thus can be tracked collectively. (See the discussion in this column in Sept/Oct 2012 issue of Inside GNSS by Drs. Lash- ley and Bevly for more information.) More specifica lly, vector tracking uses the receiver's position and velocity estimates to close the tracking loops. This approach has already attracted much attention and an extensive body of knowledge ha s documented vec- tor tracking's superiority under weak signal conditions, such as under foliage and in urban canyons
