METHODS FOR IDENTIFYING WHETHER OR NOT A SATELLITE HAS A LINE OF SIGHT

摘要

The invention, in some embodiments, relates to the field of global navigation satellite systems, and more particularly to the field of methods and devices for identifying whether a satellite in a global navigation satellite system has a line of sight to a specific global navigation satellite system receiver (LOS satellite) or does not have a line of sight to the global navigation satellite system receiver (NLOS satellite).

主权项

1. A method for classifying whether or not a GNSS satellite has a line of sight to a GNSS receiver, the method comprising:
at at least two timestamps, at a GNNS receiver, receiving signals from a GNSS satellite; using said received signals and ephemeris data of said GNSS satellite, computing a relative direction vector indicating a direction of motion of said GNSS receiver relative to said GNSS satellite; computing a Doppler vector indicating the direction of motion of said GNSS receiver relative to said GNSS satellite, based on Doppler shifts computed for each of said received signals; comparing said relative direction vector and said Doppler vector; and using said comparison, classifying whether:
said GNSS satellite is an LOS satellite having a line of sight to said GNSS receiver; orsaid GNSS satellite is an NLOS satellite, not having a line of sight to said GNSS receiver.