The present application: receives positioning data from each of a plurality of positioning terminals that have received positioning signals transmitted from a plurality of satellites; uses the received positioning data to detect, for each satellite, the difference between the positioning signal reception quality at a first positioning terminal and the positioning signal reception quality at at least one second positioning terminal; and uses the difference for each satellite to determine a satellite to be used for positioning computation for the first positioning terminal.

The present application: receives positioning data from each of a plurality of positioning terminals that have received positioning signals transmitted from a plurality of satellites; uses the received positioning data to detect, for each satellite, the difference between the positioning signal reception quality at a first positioning terminal and the positioning signal reception quality at at least one second positioning terminal; and uses the difference for each satellite to determine a satellite to be used for positioning computation for the first positioning terminal.

An electronic device includes a GPS unit, a GPS information acquisition unit, a sensor information acquisition unit, and a reception condition determination unit. The GPS unit receives a radio wave from at least one of a plurality of positioning satellites. The GPS information acquisition unit acquires ephemeris information by the GPS unit and acquires satellite arrangement information of each of the plurality of positioning satellites acquiring the ephemeris information. The sensor information acquisition unit acquires geographical condition information of a current location at which the electronic device is present. The reception condition determination unit identifies the number of positioning satellites that the receiving unit can capture at the current location among the plurality of positioning satellites acquiring the ephemeris information based on the geographical condition information of the current location and the satellite arrangement information.

An electronic device includes a GPS unit, a GPS information acquisition unit, a sensor information acquisition unit, and a reception condition determination unit. The GPS unit receives a radio wave from at least one of a plurality of positioning satellites. The GPS information acquisition unit acquires ephemeris information by the GPS unit and acquires satellite arrangement information of each of the plurality of positioning satellites acquiring the ephemeris information. The sensor information acquisition unit acquires geographical condition information of a current location at which the electronic device is present. The reception condition determination unit identifies the number of positioning satellites that the receiving unit can capture at the current location among the plurality of positioning satellites acquiring the ephemeris information based on the geographical condition information of the current location and the satellite arrangement information.

A system and method generates a phase scintillation map that is utilized to de-weight satellite signal observations from GNSS satellites. One or more base stations each assign an index value to one or more GNSS satellite in view, where the index value indicates an adverse effect of ionospheric scintillation on signals received from the GNSS satellite. The values and identifiers may be transmitted to a server. The server utilizes the received information to generate the phase scintillation map that may include one or more scintillation bubbles, wherein a location of each scintillation bubble is based on the received information. The phase scintillation map is transmitted to one or more rovers. The rover determines if a pierce point associated with a selected GNSS satellite in view of the rover falls within the boundaries of a scintillation bubble. If so, satellite signal observations from the selected GNSS satellite are de-weighted.

A navigation satellite system reception apparatus including a satellite orbit information acquisition unit that acquires orbit information of a navigation satellite, an installation position information acquisition unit that acquires position information of an installation position, an azimuth meter that acquires azimuth information of an azimuth in which a wall surface of a nearby obstruction extends, and an azimuth mask generation unit that calculates a mask region for selecting a navigation satellite to be a target of processing based on the azimuth information. A positioning and time synchronization processing unit calculates an azimuth and an angle of elevation of each navigation satellite based on the orbit information and the position information, selects a navigation satellite to be a target of processing, and performs at least one of the positioning processing or the time synchronization processing based on a received navigation satellite signal.

A navigation satellite system reception apparatus including a satellite orbit information acquisition unit that acquires orbit information of a navigation satellite, an installation position information acquisition unit that acquires position information of an installation position, an azimuth meter that acquires azimuth information of an azimuth in which a wall surface of a nearby obstruction extends, and an azimuth mask generation unit that calculates a mask region for selecting a navigation satellite to be a target of processing based on the azimuth information. A positioning and time synchronization processing unit calculates an azimuth and an angle of elevation of each navigation satellite based on the orbit information and the position information, selects a navigation satellite to be a target of processing, and performs at least one of the positioning processing or the time synchronization processing based on a received navigation satellite signal.

A hydraulic excavator includes a receiver configured to calculate a position and an azimuth angle of an upper swing structure on the basis of satellite signals received by two GNSS antennae and a controller configured to calculate a distal end position of a bucket on the basis of the position and the azimuth angle of the upper swing structure calculated by the receiver. The controller sets, on the basis of installation positions of the two GNSS antennae, a movable range of a front work device and an inclination angle and an azimuth angle of the upper swing structure, a range within which the front work device possibly becomes an obstacle to reception of satellite signals by each of the two GNSS antennae as a mask range. The receiver is configured to calculate the position and the azimuth angle of the upper swing structure on the basis of the satellite signals transmitted from the remaining satellites other than the satellites positioned in the mask range.

A hydraulic excavator includes a receiver configured to calculate a position and an azimuth angle of an upper swing structure on the basis of satellite signals received by two GNSS antennae and a controller configured to calculate a distal end position of a bucket on the basis of the position and the azimuth angle of the upper swing structure calculated by the receiver. The controller sets, on the basis of installation positions of the two GNSS antennae, a movable range of a front work device and an inclination angle and an azimuth angle of the upper swing structure, a range within which the front work device possibly becomes an obstacle to reception of satellite signals by each of the two GNSS antennae as a mask range. The receiver is configured to calculate the position and the azimuth angle of the upper swing structure on the basis of the satellite signals transmitted from the remaining satellites other than the satellites positioned in the mask range.

The technology disclosed teaches a method of path planning using a GNSS Forecast, requesting the GNSS Forecast of signal obscuration on behalf of a vehicle travelling in a region, receiving and using the Forecast to plan a path or route that has GNSS signals available over the path or route that satisfy a predetermined criterium. Also taught are GNSS Forecasts and planned paths or routes for a plurality of flying vehicles used by a flight control system, requesting the GNSS Forecast of signal obscuration on behalf of a flying autonomous or automated vehicle travelling in a region, receiving and using the Forecast and to plan a path with GNSS signals available over the path that satisfy predetermined criteria including accommodating real-time changes in flight paths, without leaving space, that satisfies the predetermined criteria. Also taught is certifying performance of GNSS receivers used on a flying vessel.