A tightly combined GPS/BDS carrier differential positioning method is provided. The method comprises: using a GPS as a reference system to construct a GPS intra-system double-difference ionosphere-free combination model and a GPS/BDS inter-system double-difference ionosphere-free combination model; selecting a BDS reference satellite to re-parameterize an ambiguity of a GPS/BDS inter-system double-difference ionosphere-free combination and perform parameter decorrelation, estimating an ionosphere-free combination carrier differential inter-system bias in real time, and performing reference conversion on the ionosphere-free carrier inter-system bias to realize a continuous estimability of the ionosphere-free carrier differential inter-system bias in necessary; and finally, using ambiguity-fixed base carrier observations to form the ionosphere-free combination and performing tightly combined positioning on the inter-system double-difference ionosphere-free combination based on the estimated ionosphere-free carrier difference inter-system bias.

The invention relates to engineering geodesy for monitoring a height and deformation of a pipeline. The invention includes use of a complex of interrelated monitoring measures that include monitoring a control position of deformation control benchmarks using optic geodetic devices and mobile satellite geodetic receivers. A state geodetic network is used only at an initial stage for reference of the network sites to the local system of coordinates. Geodetic measurements are then converted to a local system of coordinates. The invention decreases an amount of time and labor for detection of the oil pipeline coordinates for operational needs and simplifies a planned high-altitude position data exchange, storage and transfer during measurement.

A positional measurement system includes: a mobile robot including a global navigation satellite system (GNSS) signal reception unit that receives GNSS signals and calculates a position of the mobile robot based on the GNSS signals, a GNSS signal precision evaluation unit that evaluates positional measurement precision by the received GNSS signals, and a position control unit that moves the mobile robot to a high-precision reception position, where GNSS signals yielding positional measurement precision higher than a first threshold precision can be received; a relative position detection unit that detects a relative position of a target as to the mobile robot situated at the high-precision reception position; and a target position calculation unit that calculates a position of the target based on the calculated position of the mobile robot based on the GNSS signals received at the high-precision reception position, and the relative position.

An information processing system includes a server and a first vehicle acquiring a combination of first and second position information of the first vehicle. The first position information is calculated using a positioning signal from the first satellite system. The second position information is obtained by correcting an error of the first position information using a positioning reinforcement signal from the second satellite system. The first vehicle or the server calculates difference information between the first and second position information for each combination thereof. The server estimates a calculation accuracy for the first position information in a road section on a road map based on one or more pieces of difference information in which one or more positions indicated by the second position information corresponding to the difference information are within the road section and to output the calculation accuracy for the first position information in the road section.

The invention concerns a method for determining the location of a railway vehicle comprising a first navigation module determining a regular resolution position of the railway vehicle with a first accuracy measurement and a second navigation module determining a high resolution position of the railway vehicle with a second accuracy measurement, using the received signals. The method comprises the steps of determining a first confidence area around the regular resolution position, based on the first accuracy measurement, of determining a second confidence area around the high precision position, based on the second accuracy measurement, and of assigning a weight of confidence to the knowing of the actual location of the railway vehicle, by analyzing the overlay of the first and the second confidence areas and the first and the second accuracy measurements.

Systems, devices, and methods for a vertical take-off and landing (VTOL) aerial vehicle having a first GPS antenna and a second GPS antenna, where the second GPS antenna is disposed distal from the first GPS antenna; and an aerial vehicle flight controller, where the flight controller is configured to: utilize a GPS antenna signal via the GPS antenna switch from the first GPS antenna or the second GPS antenna; receive a pitch level of the aerial vehicle from the one or more aerial vehicle sensors in vertical flight or horizontal flight; determine if the received pitch level is at a set rotation from vertical or horizontal; and utilize the GPS signal not being utilized via the GPS antenna switch if the determined pitch level is at or above the set rotation.

Methods of checking the integrity of the estimation of the position of a mobile carrier are provided, the position being established by a satellite-based positioning measurement system, the estimation being obtained by the so-called real time kinematic procedures. The method verifies that the carrier phase measurement is consistent with the code pseudo-distance measurement. The method comprises a step of calculating the velocity of the carrier, at each observation instant, a step of verifying that at each of the observation instants, the short-term evolution of the carrier phase of the signals received on each of the satellite sight axes is consistent with the calculated velocity and a step of verifying that at each of the observation instants, the filtered position obtained on the basis of the long-term filtered measurements of pseudo-distance through the carrier phase is dependable.

A convenient swing monitoring method and device for skyscrapers is provided. The method firstly designs a building monitoring network based on multi-mode integrated navigation receivers by adopting a vertically distributed three-layer three-dimensional mesh layout, then determines a maximum deviation, maximum inclination angle and maximum inclination azimuth of a building structure, constructs a high-fidelity fault-tolerant filter with anti-outlier effects, draws curves changing with time of structural deformation variables of the building structure, and finally judges whether the building structure has abnormal changes in line with relevant international and domestic building safety standards. The perception and warning of the collapse risk of super-high building structures can be effectively realized, the risk perception ability of skyscraper disasters is improved, and the influence of various factors on the safety of super-high buildings can be accurately monitored, analyzed and evaluated, so as to prevent risks beforehand.

The present disclosure relates to a receiving device and a receiving method that can receive both signals of a GNSS signal and a wireless LAN at lower cost and more compactly. A selecting unit selects either a received GNSS signal or wireless LAN signal. By multiplying the signal selected in the selecting unit by a local oscillation signal generated in a local oscillation circuit, a converting unit converts the selected signal into an IF signal with lower intermediate frequency. A control unit controls the selecting unit, and performs control so that the GNSS signal and the wireless LAN signal are processed in a time-sharing manner in the converting unit. The technology of the present disclosure can be applied to a receiving device that receives a signal from a GPS satellite, for example.

Examples for enhancing sensitivity to reflected GNSS signals are presented herein. An example may involve identifying, by a receiver, a particular positioning signal that reflected off a reflecting plane prior to reaching the receiver. The receiver may be in motion. The example may also involve determining a reflected satellite position for a satellite that transmitted the particular positioning signal based on identifying the particular positioning signal. The reflected satellite position may be determined by reflecting a position of the satellite about the reflecting plane. The example may also involve determining a direction vector to the reflected satellite position for the satellite and performing coherent integration over a threshold duration of time to increase a signal to noise ratio for the particular positioning signal based on the direction vector to the reflected satellite position.