For assisted satellite time and location (STL) in low earth orbit (LEO) and/or burst transmission-based STL, assistance is provided. Ephemeris information is provided to receivers of signals from LEO satellites, allowing the receivers to operate better in PNT based on the signals from the LEO satellites. Other information may be used to assist, such as terrestrial-based time and/or location of the receiver. For burst transmissions, the data (e.g., spread code) used for some or all the burst transmission is provided to the receiver, which may then replicate the signal. This replica signal assists in PNT based on the signals from the satellites transmitting the burst signals.

Systems and methods for GNSS ambiguity resolution are described herein. In some examples, the systems and methods utilize multiple search engines in parallel to validate potential integer candidates for ambiguity resolution using adaptively adjusted residual thresholds.

Methods and apparatuses for adjustment of SMTC configuration in a wireless communication system. A method of a UE comprises: receiving system information including assistance information and an SMTC including offsets for one or more SMTC windows; acquiring location information of the UE; determine, based on the assistance information and the location information, a propagation delay difference between a serving cell of the UE and a neighboring cell; adjust, based on the propagation delay difference, the offsets for one or more SMTC windows; and measuring an SSB received from a neighboring cell within the adjusted one or more SMTC windows.

A ground antenna determines the current time and its own position from received signals that were transmitted by artificial earth satellites for communication. A high-gain multi-beam electrically-steered antenna is combined with a processing system to measure the angles between two or more satellites and determine the present distance to each satellite by the information broadcast on the TT&C channel. The knowledge of the angles and distances, as well as the trajectory of the satellites, can be combined with their locations as predicted by the satellite ephemeris data to triangulate the location of the receiver. This system is different from conventional GPS antennas because it does not require the cooperation of active communication with the satellites to derive a location estimate. The location is computed by the ground terminal, not by the satellite. This system can be used in cases where other locating services are offline, jammed, or otherwise unavailable to maintain location and time synchronization.

Systems, methods, devices, computer readable media, and other various embodiments are described for location management processes in wearable electronic devices. Performance of such devices is improved with reduced time to first fix of location operations in conjunction with low-power operations. In one embodiment, low-power circuitry manages high-speed circuitry and location circuitry to provide location assistance data from the high-speed circuitry to the low-power circuitry automatically on initiation of location fix operations as the high-speed circuitry and location circuitry are booted from low-power states. In some embodiments, the high-speed circuitry is returned to a low-power state prior to completion of a location fix and after capture of content associated with initiation of the location fix. In some embodiments, high-speed circuitry is booted after completion of a location fix to update location data associated with content.

A sensor device includes at least one processor configured to execute processing including: communicating with a user terminal serving as a communication device, acquiring a current position by using prediction ephemeris, acquiring the prediction ephemeris from the user terminal, storing position information indicating the current position acquired, repeating, at intervals, acquiring communication device position information indicating the position of the user terminal and updating the position information based on the communication device position information, and shortening the interval for acquiring the communication device position information when a discrepancy, between the communication device position information and the stored position information prior to being updated is larger than a prescribed reference.

A system and method for position determination using low earth orbit satellites. A mobile terminal affixed to an asset initiates a collection of global positioning system satellite measurements (e.g., code phase) based on a hardware trigger generated by a low earth orbit satellite modem. Timing information reflective of the time of the hardware trigger pulse is transmitted to an operations center along with the global positioning system satellite measurements to enable the operations center to determine a position of the mobile terminal.

The present invention is a method for dynamically determining a blended navigation solution for a mobile platform (ex.—aircraft) via a receiver implemented on-board the platform. In the method disclosed herein, the receiver concurrently utilizes data from satellite signals obtained from a plurality of independent satellite constellations in calculating its (the receiver's) navigation solution (ex.—Position, Velocity, Time (PVT) solution), thereby overcoming weaknesses inherent in currently available systems and methods, which rely on only a single satellite constellation.

A method of generating scintillation prediction data comprises: •a) for a plurality of satellites (12A), and reference stations (10A, 10B, 10C, 10D) measuring phase scintillation data, satellite by satellite for each reference station during multiple epochs (t−2, t−1, t, t+k); •b) forecasting an expected phase scintillation value for each satellite and reference station for a period of at least 24 hours based on a cyclical prediction model; •c) for a given user location (20) and a given satellite, spatially interpolating the expected phase scintillation values of the plurality of reference stations to determine a predicted phase scintillation index; •d) repeating step c) for further satellites visible from the user location.

Method, system, and device are provided for position determination with the use of predicted ephemeris to reduce the time-to-first-fix. The method includes: in a device, receiving broadcast orbit data and clock states from a plurality of satellites to determine first assistance data for the plurality of satellites, and numerically predicting first ephemeris for the plurality of satellites using the first assistance data. The method also includes: in a server system, receiving precise orbit data and accurate satellite clock states from a global GNSS service network to determine second assistance data; in a device, receiving the second assistance data and numerically predicting second ephemeris using the second assistance data. The method further includes: in a device, receiving satellite signals from a plurality of satellites, checking the period of validity of the first predicted ephemeris and the second predicted ephemeris respectively to select a predicted ephemeris from both the first predicted ephemeris and the second predicted ephemeris.