Abstract:
Verfahren zur Auswahl einer Kombination von GNSS-Satelliten (6) zur Durchführung einer Positionsbestimmung aus einer Vielzahl von sichtbaren GNSS-Satelliten (6) in einem GNSS-Empfänger (8) unter Berücksichtigung der Varianz der Satellitensignale (5) der jeweiligen GNSS-Satelliten (6) aufweisend die folgenden Schritte: a) Sortieren der sichtbaren GNSS-Satelliten (6) mit mindestens zwei verschiedenen Sortieralgorithmen (11,12,13) gemäß vordefinierten Kriterienkatalogen (15), welche die Varianz der Satellitensignale (5) berücksichtigen und Ermittlung von mindestens zwei Satellitenvorsortierungen (10), mit welchen GNSS-Satelliten (6) ermittelt werden, deren Satellitensignale (5) gemäß dem jeweiligen vordefinierten Kriterienkatalog (15) eine geringe Varianz aufweisen; b) Auswahl einer Gewichtungsfunktion (17,18) zur Gewichtung der in Schritt a) erstellten Satellitenvorsortierungen (10); c) Erstellen einer endgültigen Satellitensortierung (20) durch eine Gewichtung der Satellitenvorsortierungen (10) gemäß der jeweiligen Gewichtungsfunktion (17, 18), so dass eine gewichtete endgültige Satellitensortierung (20) entsteht; und d) Durchführen einer Satellitenkombinationsauswahl (21) basierend auf der endgültigen Satellitensortierung (20).
Abstract:
Techniques provided herein are directed toward using a camera, such as a forward- facing camera, to identify non-line-of-sight (NLoS) satellites in a satellite positioning system. In particular, successive images captured by the camera of the vehicle can be used to create a three-dimensional (3-D) skyline model of one or more objects that may be obstructing the view of a satellite (from the perspective of the vehicle). Accordingly, this allows for the determination of NLoS satellites and exclusion of data from the NLoS satellites in the determination of the location of the vehicle. Techniques may further include providing the determined location of the vehicle.
Abstract:
A method for estimating the position of a terminal in a satellite communication at either the ground station or in the satellite is described. The method uses estimates of the time delay, Doppler and/or Doppler Rate of signals transmitted from the terminal to the satellite together with an estimate of the satellite position. The method can be used with both synchronised terminals and unsynchronised terminals provided they have a stable time or frequency reference as well as with low earth orbit satellites both with and without on-board global position and timing references. Additionally the method can also use estimates of the time delay, Doppler or Doppler rate of beacon signals received by either the satellite or terminals. These beacon signals may include GPS L1 signals. In contrast to standard GPS receivers, the method does not require the terminal to store GPS ephemeris data or to operate continuously.
Abstract:
Techniques for acquiring Global Navigation Satellite System (GNSS) signals at a mobile device are provided. An example process according to these techniques includes receiving sensor data from at least one sensor of the mobile device, determining one or more blocked zones based on the sensor data in which at least a portion of signals from at least one space vehicle (SV) are blocked by an obstruction, selecting one or more SVs from SV information based on the one or more blocked zones, and attempting to acquire signals from the one or more SVs.