Methods and systems for excess path length corrections for GNSS receivers
AssigneeoneNav, Inc.
InventorLionel Garin
Life of this patent
Estimating the term…
Abstract
Methods and systems for estimating and using excess path length (EPL) corrections in GNSS receivers are described. A method can estimate the EPLs using a selection of line of sight and non line of sight pseudorange measurements, and these EPLs can be used to correct non selected non-line of sight pseudoranges. In one embodiment, a cloud based system can receive data from a crowd source set of EPL corrections (e.g., from GNSS receivers in an urban canyon environment) and then can develop a crowd sourced set of EPL corrections and then provide to GNSS receivers (some of which may part of the crowd of GNSS receivers) the crowd sourced set of EPL corrections. The EPL corrections can be used to improve position solutions in, for example, an urban canyon.
Claims9
A method of operating a global navigation satellite system (GNSS) system, the method comprising:
- receiving a set of estimated excess path lengths (EPLs) from one or more GNSS receivers, each of the estimated EPLs associated with an approximate location of the one or more GNSS receivers and a GNSS satellite's (SV's) position in a representation of sky above the approximate location at the approximate location at a time when pseudoranges were collected to determine the approximate location;
- receiving the approximate location for each estimated EPL;
- receiving or determining the GNSS SV's position in the representation of sky at the time and the approximate location;
- selecting a bin based on the SV's position in the representation and the approximate location;
- assigning one or more of the estimated EPLs to the selected bin;
- determining, for the selected bin, an adjusted EPL value based on a set of estimated EPLs assigned to the selected bin.
Dependencies are inferred from the claim text.