Abstract: A pressure sensor can be implemented on a network device to minimize vertical positioning errors of the network device in an indoor environment. A reference altitude and a reference pressure associated with an access point in the indoor environment are received at the network device via a communication network. A pressure is determined at the network device in the indoor environment. An altitude of the network device associated with the pressure at the network device in the indoor environment is calculated based, at least in part, on the pressure at the network device, the reference pressure, and the reference altitude. A position of the network device in the indoor environment is determined based, at least in part, on the altitude of the navigation device and location information received from at least the access point.

Abstract: A self-positioning mechanism is provided that determines and tracks the position of an access point in real time. A location unaware access point determines its location from the locations of location aware stations. The location is determined based on a predicted estimate which is updated based on measured values of the locations of the location aware stations over a time period. The movement of the location is then tracked based on the differences between range measurements of the location aware stations.

Abstract: A self-positioning mechanism is provided that determines and tracks the position of an access point in real time. A location unaware access point determines its location from the locations of location aware stations. The location is determined based on a predicted estimate which is updated based on measured values of the locations of the location aware stations over a time period. The movement of the location is then tracked based on the differences between range measurements of the location aware stations.

Abstract: A routing system can be configured to determine a route based on availability and reliability of location reference devices to determine a most reliable route between a source and a destination. Visibility information that is indicative of availability of at least a threshold number of location reference devices along the route can be determined. For each of a plurality of routes between the source and the destination, a reliability rating associated with the route can be determined based on the visibility information associated with the route. The reliability rating is indicative of a reliability of the route and an ability of the routing system to maintain continuous connectivity to the at least the threshold number of location reference devices along the route. The reliability ratings of the plurality of routes are compared to identify and to present one of the plurality of routes with a highest reliability rating.

Abstract: A self-positioning mechanism is provided that determines and tracks the position of an access point in real time. A location unaware access point determines its location from the locations of location aware stations. The location is determined based on a predicted estimate which is updated based on measured values of the locations of the location aware stations over a time period. The movement of the location is then tracked based on the differences between range measurements of the location aware stations.

Abstract: Systems, methods and devices for using ephemeris data in GNSS receivers and systems are provided. Receivers using synthetic ephemeris data for longer ephemeris availability under poor reception conditions are updated using a variety of techniques that allow for the transfer of accurate information onto degraded synthetic ephemeris information.

Abstract: A navigation system includes a pressure sensor, a calibration module in communication with the pressure sensor, and an altitude module in communication with the calibration module. The calibration module is configured to determine a dynamic pressure proportionality coefficient based at least in part on a static pressure proportionality coefficient, a measured pressure value from the pressure sensor, and a velocity value. The altitude module is configured to calculate a sensor-based altitude value based at least in part on the determined dynamic pressure proportionality coefficient.

Abstract: A self-positioning mechanism is provided that determines and tracks the position of an access point in real time. A location unaware access point determines its location from the locations of location aware stations. The location is determined based on a predicted estimate which is updated based on measured values of the locations of the location aware stations over a time period. The movement of the location is then tracked based on the differences between range measurements of the location aware stations.

Abstract: A pressure sensor can be implemented on a network device to minimize vertical positioning errors of the network device in an indoor environment. A reference altitude and a reference pressure associated with an access point in the indoor environment are received at the network device via a communication network. A pressure is determined at the network device in the indoor environment. An altitude of the network device associated with the pressure at the network device in the indoor environment is calculated based, at least in part, on the pressure at the network device, the reference pressure, and the reference altitude. A position of the network device in the indoor environment is determined based, at least in part, on the altitude of the navigation device and location information received from at least the access point.

Abstract: A routing system can be configured to determine a route based on availability and reliability of location reference devices to determine a most reliable route between a source and a destination. Visibility information that is indicative of availability of at least a threshold number of location reference devices along the route can be determined. For each of a plurality of routes between the source and the destination, a reliability rating associated with the route can be determined based on the visibility information associated with the route. The reliability rating is indicative of a reliability of the route and an ability of the routing system to maintain continuous connectivity to the at least the threshold number of location reference devices along the route. The reliability ratings of the plurality of routes are compared to identify and to present one of the plurality of routes with a highest reliability rating.

Abstract: A navigation system includes a pressure sensor, a calibration module in communication with the pressure sensor, and an altitude module in communication with the calibration module. The calibration module is configured to determine a dynamic pressure proportionality coefficient based at least in part on a static pressure proportionality coefficient, a measured pressure value from the pressure sensor, and a velocity value. The altitude module is configured to calculate a sensor-based altitude value based at least in part on the determined dynamic pressure proportionality coefficient.

Abstract: Systems, methods and devices for using ephemeris data in GNSS receivers and systems are provided. Receivers using synthetic ephemeris data for longer ephemeris availability under poor reception conditions are updated using a variety of techniques that allow for the transfer of accurate information onto degraded synthetic ephemeris information.

Abstract: Provided is a method for correcting a non-line-of-sight (NLOS) error in a wireless positioning system that enhances the location accuracy of a mobile station by correcting location error caused by NLOS propagation when the mobile station is positioned in a wireless mobile communication environment, and a computer-readable recording medium for recording a program that implements the method. The method checks out the location of the MS in the above environment and provides diverse services by correcting the location error caused by NLOS propagation included in a received signal. That is, a user can enjoy a high-quality location service by receiving the location information only within the radius which user wants, such as traveler's information, vehicle tracking, location service, and location-based advertisements, because the location of the user's MS is detected precisely.