Location information (e.g., GPS information) pertaining to the location of a device may be integrated into a distributed antenna system (DAS) to enhance location based services. This may be accomplished via a system that filters and combines GPS information with DAS information. Utilization of the enhanced location based services system may enhance accuracy performance of indoor location services and improve round-trip time (RTT) location responses associated with network assisted GPS (e.g., A-GPS) location requests for services from indoor calls.

Location information (e.g., GPS information) pertaining to the location of a device may be integrated into a distributed antenna system (DAS) to enhance location based services. This may be accomplished via a system that filters and combines GPS information with DAS information. Utilization of the enhanced location based services system may enhance accuracy performance of indoor location services and improve round-trip time (RTT) location responses associated with network assisted GPS (e.g., A-GPS) location requests for services from indoor calls.

A global positioning system (GPS) and Doppler augmentation (GDAUG) end receiver (GDER) can include a GDAUG module. The GDAUG module can generate a GDER position using a time of flight (TOF) of a transponded GPS signal and a Doppler shift in a GDAUG satellite (GSAT) signal. The transponded GPS signal sent from a GSAT to the GDER can include a frequency shifted copy of a GPS signal from a GPS satellite to the GSAT. The GSAT signal can include a signal generated by the GSAT to the GDER.

A global positioning system (GPS) and Doppler augmentation (GDAUG) end receiver (GDER) can include a GDAUG module. The GDAUG module can generate a GDER position using a time of flight (TOF) of a transponded GPS signal and a Doppler shift in a GDAUG satellite (GSAT) signal. The transponded GPS signal sent from a GSAT to the GDER can include a frequency shifted copy of a GPS signal from a GPS satellite to the GSAT. The GSAT signal can include a signal generated by the GSAT to the GDER.

A localization server improves position estimates of global navigation satellite systems (GNSS) using probabilistic shadow matching and pseudorange matching is disclosed herein. The localization server may utilize one or more of the following information: the locations of the satellites, the GNSS receiver's location estimate and associated estimated uncertainty, the reported pseudoranges of the satellites, the GNSS estimated clock bias, the SNRs of the satellites, and 3D environment information regarding the location of the receiver. The localization server utilizes a Bayesian framework to calculate an improved location estimate using the GNSS location fixes, pseudorange information, and satellite SNRs thereby improving localization and tracking for a user device.

A localization server improves position estimates of global navigation satellite systems (GNSS) using probabilistic shadow matching and pseudorange matching is disclosed herein. The localization server may utilize one or more of the following information: the locations of the satellites, the GNSS receiver's location estimate and associated estimated uncertainty, the reported pseudoranges of the satellites, the GNSS estimated clock bias, the SNRs of the satellites, and 3D environment information regarding the location of the receiver. The localization server utilizes a Bayesian framework to calculate an improved location estimate using the GNSS location fixes, pseudorange information, and satellite SNRs thereby improving localization and tracking for a user device.

It is possible to reduce inadvertent vehicle behavior during autonomous driving. A vehicle position detection device includes: a satellite positioning position calculation unit 15 that receives a satellite positioning position signal of a vehicle and calculates a satellite positioning position of the vehicle; an autonomous navigation position calculation unit 16 that receives an autonomous navigation position signal of the vehicle and calculates an autonomous navigation position of the vehicle; a distance calculation unit 17 that calculates a positional difference between the satellite positioning position and the autonomous navigation position; a recording unit that stores a plurality of parameter sets in which a plurality of thresholds for allowing a positional difference for each speed of the vehicle are set per vehicle characteristic; a selection unit 14 that selects a parameter set according to the vehicle characteristic from a plurality of parameter sets 11 to 13 stored in the recording unit; and a determination unit 18 that outputs the satellite positioning position when the positional difference is within the threshold, and outputs the autonomous navigation position when the positional difference is out of the threshold.

Systems and methods are described for determining position of a receiver. The positioning system comprises a transmitter network including transmitters that broadcast positioning signals. The positioning system comprises a remote receiver that acquires and tracks the positioning signals and/or satellite signals. The satellite signals are signals of a satellite-based positioning system. A first mode of the remote receiver uses terminal-based positioning in which the remote receiver computes a position using the positioning signals and/or the satellite signals. The positioning system comprises a server coupled to the remote receiver. A second operating mode of the remote receiver comprises network-based positioning in which the server computes a position of the remote receiver from the positioning signals and/or satellite signals, where the remote receiver receives and transfers to the server the positioning signals and/or satellite signals.

Systems and methods are described for determining position of a receiver. The positioning system comprises a transmitter network including transmitters that broadcast positioning signals. The positioning system comprises a remote receiver that acquires and tracks the positioning signals and/or satellite signals. The satellite signals are signals of a satellite-based positioning system. A first mode of the remote receiver uses terminal-based positioning in which the remote receiver computes a position using the positioning signals and/or the satellite signals. The positioning system comprises a server coupled to the remote receiver. A second operating mode of the remote receiver comprises network-based positioning in which the server computes a position of the remote receiver from the positioning signals and/or satellite signals, where the remote receiver receives and transfers to the server the positioning signals and/or satellite signals.

Disclosed is a technology for increasing a positioning success rate and reducing a positioning error with high reliability by proposing an improved positioning scheme based on virtual satellites capable of improving DOP and removing an error in a satellite measurement value when a location of a terminal in an inadequate environment such as downtown/indoors near a window is measured.