Embodiments described herein provide for enabling a mobile device comprising a GNSS receiver to implement a modified PPP technique that utilizes orbit and clock information of a satellite that is broadcast from the satellite. In particular, embodiments may utilize a positioning engine to perform PPP error mitigation with respect to various error sources (e.g., troposphere, ionosphere, phase windup, etc.). With regard to errors stemming from satellite orbit and satellite clock, embodiments may utilize orbit and clock information from broadcast ephemeris data rather than obtaining precise orbit and clock information (e.g., from a third party provider). Further, embodiments may account for errors in this broadcast information by adjusting the ambiguity dynamic and/or ambiguity estimate term used by the positioning engine. This can enable the positioning engine to determine a solution more accurate than traditional GNSS without resetting.

The aircraft landing guidance support system has a correction GPS mobile station and an information processing equipment, which includes a display unit and is configured to process an RTK-GPS signal received from the correction GPS mobile station and perform a prescribed display on the display unit. The aircraft landing integrated support system has a correction GPS reference station, a pseudo GPS signal transmitter, and the aircraft landing guidance support system. The information processing equipment stores a computer program configured to cause the information processing equipment to function as a means for recording landing route data containing landing route information, a means for recording current position information data containing current position information based on the RTK-GPS signal, and a means for displaying the landing route data and the current position information on the display unit of the information processing equipment.

A position locating system to determine relative position information between a marine vessel and a trailer includes a first GNSS receiver located on one of a marine vessel and a trailer to receive a positioning signal from a positioning satellite, a second GNSS receiver located on the other of the marine vessel and the trailer to receive the positioning signal from the positioning satellite, a registering unit to register a current position of the trailer based on the positioning signal received by the first GNSS receiver when the trailer is stationary, a direction obtaining unit to obtain a direction of the marine vessel, a generating unit to generate correction information in real time based on the current position and the positioning signal received from the positioning satellite by the first GNSS receiver, and a position locator to determine relative position information between the marine vessel and the trailer.

A navigation satellite system includes a transmitter that transmits a first radio wave having a predetermined frequency, and an electronic device that calculates position coordinates of the electronic device by using a second radio wave from a GNSS satellite, and obtains position coordinates of the transmitter. The electronic device includes a receiver that receives the first radio wave from the transmitter and the second radio wave from the GNSS satellite, and a controller that calculates a distance between the electronic device and the transmitter based on the received first radio wave, and calculates position coordinates of the electronic device based on the received second radio wave. The controller calculates, based on second radio wave received when the electronic device is present at each one of three or more points, respective position coordinates of the three or more points, and calculates respective distances between the electronic device and the transmitter when the electronic device is present at each one of the three or more points. The controller calculates the position coordinates of the transmitter based on the position coordinates of the three or more points and respective distances between each one of the three or more points and the transmitter.

A navigation satellite system includes a transmitter that transmits a first radio wave having a predetermined frequency, and an electronic device that calculates position coordinates of the electronic device by using a second radio wave from a GNSS satellite, and obtains position coordinates of the transmitter. The electronic device includes a receiver that receives the first radio wave from the transmitter and the second radio wave from the GNSS satellite, and a controller that calculates a distance between the electronic device and the transmitter based on the received first radio wave, and calculates position coordinates of the electronic device based on the received second radio wave. The controller calculates, based on second radio wave received when the electronic device is present at each one of three or more points, respective position coordinates of the three or more points, and calculates respective distances between the electronic device and the transmitter when the electronic device is present at each one of the three or more points. The controller calculates the position coordinates of the transmitter based on the position coordinates of the three or more points and respective distances between each one of the three or more points and the transmitter.

A device implementing a system for device orientation initialization includes at least one processor configured to determine that the device is within or coupled to a vehicle in motion. The at least one processor is configured to employ, in response to the determining, a first position estimation model to estimate a position of the device, and detect occurrence of a predefined condition with respect to employing the first position estimation model. The at least one processor is further configured to switch, in response to detecting occurrence of the predefined condition, from employing the first position estimation model to employing a second position estimation model to estimate the position of the device. The first and second position estimation model apply different respective error state metrics in estimating the position of the device.

A device implementing a system for device orientation initialization includes at least one processor configured to determine that the device is within or coupled to a vehicle in motion. The at least one processor is configured to employ, in response to the determining, a first position estimation model to estimate a position of the device, and detect occurrence of a predefined condition with respect to employing the first position estimation model. The at least one processor is further configured to switch, in response to detecting occurrence of the predefined condition, from employing the first position estimation model to employing a second position estimation model to estimate the position of the device. The first and second position estimation model apply different respective error state metrics in estimating the position of the device.

According to one aspect of the disclosure, a location node configured to communicate with a wireless device is provided. The location node includes processing circuitry configured to: receive spatial information; determine the wireless device relationship between a first reference station and a second reference station based at least in part on the spatial information; compare a first integer ambiguity level of the first reference station with a second integer ambiguity level of the second reference station, the second reference station corresponding to a current reference station of the wireless device; and transmit an indication of an applicability of the first integer ambiguity level of the first reference station to the second integer ambiguity level of the second reference station for position estimation, the indication being based on the comparison of the first integer ambiguity level with the second integer ambiguity level.

A system and method for detecting spoofing of a Global Navigation Satellite System (GNSS) system using a plurality of antennas. Signals received by at least two of the plurality of antennas are authentication by use of one or more of a carrier phase authentication procedure, a signal power authentication procedure, and/or a channel distortion authentication procedure.

An information processing device in an embodiment includes an acquiring unit configured to acquire identification information for identifying a commodity placing table moved from a setting position, an updating unit configured to update a position-information storing section that stores the identification information and position information indicating the setting position of the commodity placing table in association with each other, and an output unit configured to, if the acquiring unit acquires the identification information, output alert information concerning the update of the position-information storing section.