Simulator vendors explain their evolution in response to changes in GNSS/PNT, comment on technical challenges they face, and outline principal markets.
Inertially-aided extended coherent integration makes a GNSS receiver more sensitive to directly received signals than to reflected signals whenever the receiver is moving. 3D-mapping-aided GNSS uses predictions of which signals are NLOS to enhance the positioning algorithms. Both techniques can improve positioning accuracy in dense urban areas by more than a factor of two. This article investigates the benefits of combining them.
PAUL D GROVES AND QIMING ZHONG, UNIVERSITY COLLEGE LONDON
RAMSEY FARAGHER AND PAULO ESTEVES, FOCAL POINT POSITIONING
The two main causes of positioning errors of tens, sometimes as much as hundreds of meters in dense urban areas are non-line-of-sight (NLOS) reception and multipath interference. These phenomena are often grouped together and referred to simply as “multipath,” although this is highly misleading as the two have different characteristics and can require different mitigation techniques. Synergy between super-correlation, or S-GPS/GNSS, a