A low-earth orbit (LEO) satellite includes a non-atomic clock configured to generate a clock signal, a navigation signal receiving and processing module, and a navigation signal generation and transmission module. The navigation signal receiving and processing module is configured to receive the clock signal from the non-atomic clock, receive first signaling including first timing data generated based on a high precision clock, and generate clock state data based on the clock signal and the first timing data. The navigation signal generation and transmission module is configured to receive the clock signal from the non-atomic clock, generate a navigation message that indicates the clock state data, generate a broadcast carrier signal by utilizing the clock signal, generate a navigation signal based on modulating the navigation message upon the broadcast carrier signal, and broadcast the navigation signal for receipt by at least one client device.

The present application provides a method for navigation and positioning of a receiver, including: receiving basic broadcast messages and correction parameters of a plurality of satellites, and establishing a pseudorange observation equation and a carrier-phase observation equation corresponding to each of satellites respectively; correcting the pseudorange observation equation and the carrier-phase observation equation using the received correction parameters to obtain the corrected pseudorange observation equation and the corrected carrier-phase observation equation; constructing a first observation according to the corrected pseudorange observation equation and the corrected carrier-phase observation equation; constructing a second observation according to the corrected pseudorange observation equation and the corrected carrier-phase observation equation; and jointly solving the obtained first observations and second observations of the plurality of satellites to obtain anoperation result of user positioning.

The present invention provides a BeiDou-based grid augmentation autonomous driving multi-level warning system comprising a Beidou Satellite Ground-based Augmentation system, user terminals and a Vehicles internet system, wherein the Beidou Satellite Ground-based Augmentation system comprises Beidou grid reference stations, a data processing system and a data broadcast system; the user terminal comprises an in-vehicle receiver and a calculating chips. The present invention can reduce the occurrence of traffic accidents and reduce the loss of life and property.

An approach is provided for base station selection for differential positioning. The approach, for example, involves determining a trajectory of a positioning receiver. The positioning receiver provides data for using a differential positioning system to determine location data. The approach also involves selecting one or more locations along the trajectory. The approach further involves scanning a base station network to find one or more base stations for the one or more locations. The one or more base stations provide location correction data for differential positioning. The approach further involves providing a list of the one or more base stations for performing the differential positioning.

A system and method for determining accurate positions of stationary global navigation satellite system (GNSS) sensors are provided. The method comprises triggering collection of satellite measurements by each of at least a first stationary GNSS sensor and a second stationary GNSS sensor, wherein the satellite measurements are collected per epoch; determining a position of the first stationary GNSS sensor using the satellite measurements collected by the first stationary GNSS; and determining a position of the second stationary GNSS sensor using the satellite measurements collected by the second stationary GNSS and at least the determined position of the first stationary GNSS, wherein the first stationary GNSS sensor is deployed in the vicinity of the second GNSS sensor.

For operating a correction service system for a satellite-based navigation system that is configured to determine a position of user devices, where the correction service system includes a plurality of reference stations having known and fixed coordinates and a plurality of receivers, a method includes operating a first group of the reference stations and the plurality of receivers, ascertaining a first correction value based on the satellite signals received by the first group of reference stations and their coordinates, ascertaining a second correction value based on the signals received by the plurality of receivers, ascertaining, based on the first and second correction values, a third correction value that is provided to the user devices.

A central location system provides an end-to-end high-accuracy positioning solution that provides navigation, geo-tagging, and general positioning data to receivers. The central location system does this by providing a cloud correction service and a robust positioning engine. For example, the central location system may provide single-frequency receivers with corrections for atmospheric delays and multipath throughout different geographic regions. The central location system computes corrections by leveraging location data from dual-frequency receivers. The central location system may also increase ionospheric delay coverage of portions of a geographic region. With increased ionospheric delay coverage, receivers can compute better location estimates. The central location system may also compute refined location estimates of single-frequency receivers and/or dual-frequency receivers for receivers with limited access to signals transmitted from satellites. The central location system may do this by estimating a receiver's location with respect to the location estimates of other receivers.

A navigation system includes: a communication circuit configured to: receive a base station data including an actual location and a satellite provided reference location from a base station, and transfer the base station data to an artificial intelligence (AI) correction calculator, already trained to negate a multipath interference of a position satellite; a control circuit, coupled to the communication circuit, configured to: calculate a real-time kinematics (RTK) correction, by the AI correction calculator, based on the satellite provided reference location and the actual location; and enable the communication circuit to transmit the RTK correction by an over the air (OTA) communication to the base station including the base station transferring the RTK correction to a device for correcting the satellite provided reference location to a real-world location and displaying on the device.

A position fix identifying a geographic location of a receiver is received. The position fix was generated using signals received at the receiver from respective high-altitude signal sources (such as satellites). Imagery of a geographic area that includes the geographic location is also received. The imagery is automatically processed to determine whether one or more of the high-altitude signal sources were occluded from the geographic location when the position fix was generated. In response to determining that one or more of the high-altitude signal sources were occluded from the geographic location when the position fix was generated, the position fix is identified as being potentially erroneous.

Exemplary embodiments include methods of estimating the position of a user equipment, UE, in association with a plurality of reference stations. Such embodiments can include performing one or more positioning measurements (e.g., carrier-phase measurements of GNSS satellite signals), and receiving transfer information between a first reference system and a second reference system. Such embodiments can also include determining an estimate of the UE's position based on the positioning measurements for the UE, the transfer information, and location coordinates of a plurality of entities (e.g., reference stations), wherein the location coordinates of at least one entity is associated with the first reference system and the location coordinates of at least one other entity is associated with the second reference system. Other embodiments include complementary methods performed by network nodes, as well as UEs and network nodes configured to perform such methods.