A method of enhancing the accuracy of a navigation system which includes a GNSS receiver. The method includes receiving navigation signals from at least one GNSS constellation and a LEO constellation. Position estimates will be made through implementation of a filter using successive readings of pseudoranges and carrier-phase measurements from the GNSS constellation and carrier-phase measurements from the LEO constellation.

A system or method for generating GNSS corrections can include receiving satellite observations associated with a set of satellites at a reference station, determining atmospheric corrections valid within a geographical area; wherein geographical areas associated with different atmospheric corrections can be overlapping, and wherein the atmospheric corrections can be provided to a GNSS receiver when the locality of the GNSS receiver is within a transmission region of the geographical area.

A method comprises receiving an approximate location of a rover platform based on satellite signals for a Global Navigation Satellite System (GNSS), and receiving for the GNSS a differential correction map (DCM) representing a non-planar surface of differential corrections that varies across a geographical area represented by the DCM. The differential corrections are based on a reference station constellation of GNSS reference stations having respective locations spanning the geographical area. The method further comprises deriving DCM-based differential corrections for the satellite signals at the approximate location based on the DCM, correcting the satellite signals using the DCM-based differential corrections, and determining a location of the rover platform using the corrected satellite signals.

A monitor unit (25) monitors positioning augmentation information for correction of satellite positioning errors, the positioning augmentation information being generated by an augmentation information generation device with use of a specified parameter value being a parameter value which is specified. In a case where an abnormality is detected in the positioning augmentation information by the monitor unit (25), a selection unit (26) selects a reserve parameter value that is to substitute for the specified parameter value, from among a plurality of reserve parameter values being a plurality of parameter values that are different from the specified parameter value and commands the augmentation information generation device to use the selected reserve parameter value as a new specified parameter value.

The system and method facilitates Real-Time-Kinematic (RTK) GNSS with long baseline between a rover receiver and a base station receiver, even in the presence of scintillation or ionospheric disturbances that spatially fluctuate. Residual atmospheric errors can be estimated by a dual error model in a filter to promote efficient fixing or resolution of carrier phase ambiguities.

A system includes Referential Global Positioning System (RGPS) base stations, servers and mobile devices. Each RGPS station includes: (i) global navigation satellite system (GNSS) receivers and antennas for receiving GNSS geolocation data, Cellular Location Technology (CLT) geolocation data, Wi-Fi Positioning System (WPS) geolocation data; (ii) a data processor for positioning error correction, and signal processing; and (iii) a transmitter for transmitting the error corrections and processed GPS data to the servers. The servers (i) receive, aggregate, and store, the GNSS, CLT, and Wi-Fi error corrections and processed GPS data, and (ii) transmit the location-specific GPS data to any mobile device in proximity. Each mobile device calculates a calculate a highly accurate location of the mobile device by obtaining and combining the location-specific GPS data from a RGPS server, and device-specific geolocation data from a GNSS sensor, a CLT sensor and a WPS sensor, on the mobile device.

A first positioning processing unit executes independent positioning for calculating the position of a work vehicle on the basis of a satellite signal received from a satellite. A transmission processing unit transmits point positioning information to a base station server that selects one base station. An acquisition processing unit acquires correction information associated with the one base station from the base station server. A second positioning processing unit executes RTK positioning for calculating the current position of the work vehicle on the basis of the correction information. When the RTK positioning for the work vehicle based on first correction information associated with a first base station becomes possible, the transmission processing unit transmits, to the base station server, the point positioning information immediately before the RTK positioning becomes possible.

Selective broadcast of corrective vehicle positioning information using a hyper-precise-positioning (HPP) proxy is presented herein. A system can obtain satellite navigation correction data; assign respective portions of the satellite navigation correction data to defined geographical regions to facilitate respective point-to-multipoint wireless broadcasts of the respective portions of the satellite navigation correction data to respective vehicles that have been determined to be located within the defined geographical regions; and distribute, via respective signaling planes, broadcast requests comprising the respective portions of the satellite navigation correction data to respective wireless access point devices to facilitate the respective point-to-multipoint wireless broadcasts of the respective portions of the satellite navigation correction data—such satellite navigation correction data facilitating correction of satellite navigation data that has been received by the respective vehicles.

A location information system may comprise a first mobile body; a plurality of base stations communicable with the first mobile body; and a location obtainer device mounted on a second mobile body and communicable with the plurality of base stations. The first mobile body may comprise a moving mechanism configured to move the first mobile body; and a first location obtainer configured to obtain first location information indicating a location of the first mobile body. Each of the plurality of base stations may comprise a base station location obtainer configured to obtain base station location information indicating a location of the base station. The location obtainer device may comprise a second location obtainer configured to obtain second location information indicating a location of the second mobile body.

Disclosed are a method for controlling an unmanned aerial vehicle, a method for controlling outbound and return trips of an unmanned aerial vehicle, an unmanned aerial vehicle, a medium, and a control system. The method for controlling an unmanned aerial vehicle includes: obtaining, in a process of flying along a target course sent by a first ground station, first positioning auxiliary information sent by the first ground station; adjusting a flight attitude according to the first positioning auxiliary information, to fly along the target course; in a case of determining that a ground station switching condition of the second ground station is satisfied, obtaining the second positioning auxiliary information sent by the second ground station; and adjusting the flight attitude according to the second positioning auxiliary information, to fly along the target course to reach the second location point.