Abstract: 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.

Abstract: Error and integrity evaluation during a position determination, includes: recording position values (P?N, P?2, P?1) and calculating clock errors of a receiver via time-discrete runtime measurements by a satellite navigation system; recording a first pseudo-distance at a later time via time-discrete runtime measurement by the satellite navigation system; extrapolating a position value (P?0) of the receiver at the later time and extrapolating a clock error of the receiver at the later time; establishing a distance (r?0) between the extrapolated position value (P?0) of the receiver and the position of a satellite (S0) of the satellite navigation system at the later time, wherein a quality measure for the usability of the position determination with the satellite is obtained by forming a second pseudo-distance based on the sum of the established distance (r?0) and the extrapolated clock error at the later time and comparing the second pseudo-distance with the first pseudo-distance.

Abstract: Systems and methods for minimizing uncertainty in a geospatial location measurement. First and second positional data of a first reference marker are received, each comprising an uncertainty radius about a preliminary coordinate. A first translation vector comprising the displacement to the first reference marker from the second reference marker is received. The second uncertainty radius is translated by the first translation vector and, based on an intersection area of the translated second uncertainty radius and the first uncertainty radius, the first uncertainty radius is reduced to the intersection area.

Abstract: The present disclosure relates to a location measurement method using a processor. The location measurement method includes: acquiring a surrounding image photographed by an electronic device; acquiring first location information of the electronic device using a global navigation satellite system; and acquiring second location information obtained by correcting the first location information using the surrounding image photographed by the electronic device, in which a correction value for correction from the first location information to the second location information is calculated by detection of an image including a static object included in the photographed surrounding image from a pre-stored real-world image map.

Abstract: Aspects of the subject disclosure may include, for example, computing a first location of a processing system, receiving first data via a unicast transport technology at a first rate, computing a first corrected location of the processing system in accordance with the first location and the first data, receiving second data via a broadcast transport technology, a multicast transport technology, or a combination thereof, at a second rate that is less than the first rate, and computing a second corrected location of the processing system in accordance with the second data. Other embodiments are disclosed.

Abstract: An abnormality determination device includes a control unit for determining an abnormality of a robot, the control unit being configured to calculate a measurement probability distribution which is a probability distribution using disturbance torque acquired during a predetermined period as a random variable. The control unit causes an average of the calculated measurement probability distribution to conform to an average of an evaluation normal model which is a predetermined probability distribution, compares the measurement probability distribution with the evaluation normal model of which the respective averages conform to each other, and determines an abnormality of the robot in accordance with a result of the comparison.

Abstract: A wireless network device in a wide area network is disclosed. A radio of the network device receives a plurality of communication signals. The device detects a signal to noise ratio value and/or a noise floor value and determines, for each frequency channel, when one of the detected signal to noise ratio value is less than a signal to noise ratio threshold value for a period of time and/or the detected noise floor value is greater than a noise floor threshold value for the period of time. The device transmits a jamming warning signal when one of the detected signal to noise ratio value for each of the channels is determined to be greater than the signal to noise ratio threshold value for the period of time and/or the detected noise floor value for each channel is greater than the noise floor threshold value for the period of time.

Abstract: To provide a positioning technology capable of measuring a position of a moving object moving at high speed with high reliability, high accuracy, and high speed. The positioning system 1000 can obtain accurate position data using the positioning information collected from a plurality of base stations, and deliver the obtained accurate position data to the base station. In the positioning system 1000, the base station serving as the position reference station can always hold the accurate position data based on the accurate measurement result data. In the positioning system 1000, the base station whose accurate position is known is used as a position reference station to perform RTK positioning with, for example, the mobile station, thus allowing the position of the mobile station to be measured with high accuracy.

Abstract: A method for ascertaining output data of a global navigation satellite system (GNSS) locating device based on GNSS satellite signals in a vehicle, includes a) receiving surroundings data from the surroundings of the vehicle, b) generating a surroundings model to describe the surroundings of the vehicle using the surroundings data received in step a), c) receiving GNSS satellite signals from GNSS satellites using a GNSS receiver, and d) ascertaining output data of the GNSS locating device from the GNSS satellite signals received in step a). The surroundings model generated in step b) is used to compensate for anomalies caused by the surroundings of the propagation of the GNSS satellite signals from the GNSS satellites to the GNSS receiver.

Abstract: 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; a control circuit, coupled to the communication circuit, configured to: transfer a pseudorange, of a satellite, from the AI correction calculator; calculate a real-time kinematics (RTK) correction based on the pseudorange; 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.

Abstract: Systems, methods, and devices for establishing a confidence level for local operational data for a device within a technological ecosystem, such as the V2X ecosystem. The systems, methods, and devices may perform operations that include: obtaining local operational data for the device; obtaining messages from multiple external devices participating in the ecosystem, wherein each of the messages includes external operational data for the transmitting external device; determining, based on the local operational data and the external operational data from the messages, a confidence level for the local operational data; and executing a remedial action when the confidence level falls below a threshold for the confidence level. The systems and devices may include a local data source that stores the local operational data and a communication interface.

Abstract: A method and installation for calibrating an airborne goniometry apparatus by means of a calibration generator, remote from the airborne goniometry apparatus. The method includes sharing, between the goniometry apparatus and the calibration generator, a calibration sequence. The method also includes sharing, between the goniometry apparatus and the calibration generator, a start time of the calibration sequence. The method further includes executing the calibration sequence by the goniometry apparatus and by the calibration generator, at the start time. The start time is determined in reference to the same clock, referred to as a reference clock, provided to the goniometry apparatus and the calibration generator, by an external source.

Abstract: Systems and methods for using transmission sensor(s) in localization of an autonomous vehicle (“AV”) are described herein. Some implementations receive instance(s) of transmission sensor data generated by transmission sensor(s) of the AV, generate pose instance(s) of a pose of the AV based on the instance(s) of the transmission sensor data, and cause the AV to be controlled based on the pose instance(s). In some of those implementations, the pose instance(s) can be generated based on steering data the AV that indicates steering angle(s) of the autonomous, and that temporally correspond to the instance(s) of the transmission sensor data. In various implementations, the pose instance(s) may only be generated or utilized based on the instance(s) of the transmission sensor data (and optionally the steering data) in response to detecting an adverse event at the AV.

Abstract: Described are methods, systems, and devices for correcting ionospheric error. In some aspects, a mobile device equipped with a Global Navigation Satellite System (GNSS) receiver is configured to determine a positioning measurement of a GNSS signal. The mobile device is further configured to receive augmentation data from an augmentation system. When augmentation data for a current measurement period is unavailable, the mobile device can obtain augmentation data associated with Total Electron Content (TEC) values (e.g., vertical TEC values) during one or more prior measurement periods. Based on the augmentation data associated with TEC values during one or more prior measurement periods and a pierce point of the received GNSS signal, an ionospheric error in the positioning measurement of the GNSS signal can be determined and corrected.

Abstract: Method for improving global positioning performance of a first road vehicle (10), the method comprising, by means of a data server (3, 4, 4?): acquiring data from onboard sensors (2a, 2b, 2c, 2d, 2e, 2f, 2g) arranged on the first road vehicle (10) and on at least two neighbouring road vehicles (10?, 10?, 10??), the data comprising data on relative positions and data on heading angle and velocity of the road vehicles (10, 10?, 10?, 10??), and acquiring global positioning data of at least two of the road vehicles (10, 10?, 10?, 10??), processing (102) data comprising the global positioning data, the data, with corresponding timestamp, acquired from the onboard sensors (2a, 2b, 2c, 2d, 2e, 2f, 2g), and a motion model for each of the first road vehicle (10) and the at least two neighbouring road vehicles (10?, 10?, 10??) using a data fusion algorithm, calculating adjusted global positioning data for the first road vehicle (10) and communicating (104) the adjusted global positioning data to a positioning system (6

Abstract: Disclosed are various techniques for wireless communication. In one aspect, a user equipment (UE) may receive, from a satellite vehicle (SV), a signal of a first frequency band, estimate a first ionospheric delay residual error based on the signal of the first frequency band, calculate a first pseudorange measurement and a first carrier phase measurement based on the first ionospheric delay residual error, and estimate a position using the first pseudorange measurement and the first carrier phase measurement. In some aspects, the ionospheric delay residual error is estimated via a Klobuchar equation. In some aspects, the position is estimated using ultra-long baseline real-time kinematics (RTK) positioning.

Abstract: System for creating a surroundings model of a motor vehicle, which is or can be connected with: at least one navigation unit, which is equipped to provide information about the instantaneous position of the vehicle and information about at least one segment of road in front of the vehicle in time and space, wherein the navigation unit provides the information in a digital map format and/or in absolute position information, at least one interface, which is equipped to communicate with at least one object to be merged in the surroundings of the vehicle, wherein the information received by the interface includes absolute position information on the at least one object to be merged, and/or at least one sensor unit, which is equipped to detect at least one object to be merged in the surroundings of the vehicle, wherein the at least one sensor unit is additionally equipped to provide relative position information on the at least one object to be merged relative to the vehicle, wherein the system is equipped to a

Abstract: A device for determining position information includes a detector that is configured to detect a position of the device and a processor that is configured to determine the position information based on a primary position indication from the detector and a secondary position indication from a second detector that is distinct from the detector. The processor determines the position information by aligning the primary position indication with the secondary position indication based on identifying a pattern of the primary position indication that corresponds with a pattern of the secondary position indication.

Abstract: Described herein are systems and techniques for mitigating the impact of attenuated satellite signals received at mobile devices. A mobile device receives multiple signals from a single satellite on different carrier frequencies. The mobile device calculates two pseudorange measurements, each pseudorange measurement from a different signal of the multiple signals. The mobile device calculates the difference between the two pseudorange measurements, and if the difference exceeds a first threshold and the first pseudorange measurement is larger than the second pseudorange measurement, the mobile device marks the first pseudorange measurement as impaired. If the difference exceeds a second threshold and the second pseudorange measurement is larger than the first pseudorange measurement, the second pseudorange measurement is marked as impaired. The impaired measurements may be weighted or excluded from use in calculating a position of the mobile device or in another pseudorange measurement based calculation.

Abstract: A system for estimating a receiver position with high integrity can include a remote server comprising: a reference station observation monitor configured to: receive a set of reference station observations associated with a set of reference stations, detect a predetermined event, and mitigate an effect of the predetermined event; a modeling engine configured to generate corrections; a reliability engine configured to validate the corrections; and a positioning engine comprising: an observation monitor configured to: receive a set of satellite observations from a set of global navigation satellites corresponding to at least one satellite constellation; detect a predetermined event; and mitigate an effect of the predetermined event; a carrier phase determination module configured to determine a carrier phase ambiguity of the set of satellite observations; and a position filter configured to estimate a position of the receiver.

Abstract: Differential ranging measurements are formed using first ranging measurements from reference GNSS receivers and second ranging measurements from GNSS receivers on a rover, the first and second ranging measurements received from a plurality of GNSS satellites. A main navigation solution and a main protection level (PL) set are computed based on the differential ranging measurements. Ionospheric threat scenarios associated with experiencing severe ionospheric gradients to one or more of the plurality of GNSS satellites are determined. A supplemental navigation solution and a corresponding supplemental PL set for each of the plurality of ionospheric threat scenarios are computed. A maximum PL set is selected based on the main PL set and the supplemental PL sets to form a final PL set that protects the main solution against nominal navigation threats and severe ionospheric threats.

Abstract: Computer-implemented data structure (UERE database) including at least one location-dependent UERE value, the at least one UERE value being ascertained with the aid of a method for ascertaining a location-dependent or time-dependent UERE value based on a measurement of the location accuracy or with the aid of a method for determining a location-dependent or time-dependent UERE value with the aid of a machine learning method.

Abstract: A tightly combined GPS/BDS carrier differential positioning method is provided.

Abstract: A method for correcting errors in location data. The method provides a planned route of travel of vehicle to server system. The vehicle uses planned route to travel on a route of travel. The vehicle records location measurement raw data of vehicle using location measurement system in vehicle during travel. Moreover, the vehicle determines a relative location of each object of a plurality of objects present in a vicinity of the route of travel. The vehicle acquires a portion of a first set of location correction data streams from the server system. The vehicle utilizes the acquired portion of the first set to determine errors in the location measurement raw data to derive correct location data of the vehicle. A correct location of each object is derived based on the derived correct location data of vehicle for georeferencing plurality of objects.

Abstract: Disclosed is a method of providing dilution of precision (DOP) forecasts for GNSS navigation and optionally degree of confidence, for routing of vehicles or alerting humans in vehicles: accessing a 3D map of an area including structure solids and generating cuboids in spaces not contained in the structure solids, and iteratively over time increments, calculating GNSS satellites visible from the cuboids using the 3D map and, using at least the calculated visibility, determining a DOP forecast for GNSS signals observable in the cuboids at the time increments. The disclosed method also includes compressing the calculated DOP forecast spatially and temporally, and distributing the compressed DOP forecast via a content delivery network (CDN), responsive to queries from requestors to an API of the CDN, whereby the requestors' systems can take into account the DOP forecast for routing the vehicles or alerting the humans in the vehicles to a predicted navigation impairment.

Abstract: A correction is applied to a pseudorange measured by a satellite navigation receiver, operating on the basis of signals sampled at a sampling frequency Fs, wherein the correction is based on the measured pseudorange itself. The correction may be a correction to the discriminator value determined in the DLL, or it may be correction to the actual pseudorange as such. The correction is specific for a particular PRN code and for the parameters of the receiver. The correction is therefore implemented in the receiver as a predefined function of the measured pseudorange, to be calculated in real time, or as a look-up table of pre-defined values at least between 0 and cTs, with Ts equal to 1/Fs and c the speed of light.

Abstract: A method and apparatus are provided for processing navigation signals with improved stability in a multi-frequency, multi-system environment. Satellite signals, which are transmitted by a plurality of satellites from a plurality of different global navigation satellite systems, are received on a common radio path and processed in separate digital satellite channels, with each of the separate digital satellite channels corresponding to a respective satellite signal. A common quartz-locked-loop (QLL) discriminator signal is generated based on correlation signals from each of the separate digital satellite channels. Based on the common QLL discriminator signal, guiding signals are generated, with each of the guiding signals corresponding to a respective one of the separate digital satellite channels, for reducing phase-related tracking errors in the respective satellite signal processed in its corresponding digital satellite channel.

Abstract: A system can include a producer device to receive reference data from a reference station. The system can include a queue device to store a reference message, corresponding to the reference data, in a message queue. The system can include a mapping device to store mapping information indicating that the message queue is associated with the reference station. The system can include a consumer device to identify the message queue as being associated with a microservice to be provided to a client device based on a microservice request. The message queue can be identified based on the mapping information. The consumer device can obtain the reference message from the message queue, generate corrections data associated with the client device, and provide the corrections data.

Abstract: An indoor/outdoor determination program, etc., whereby an indoor or outdoor state can be determined with higher precision than by a determination method based on satellite reception strength in which a threshold value is difficult to set. The indoor/outdoor determination program according to the present invention causes a step to be executed for determining whether a mobile terminal is present indoors or outdoors on the basis of satellite elevation angle information and/or satellite azimuth angle information acquired directly or indirectly from a satellite receiver provided to the mobile terminal.

Abstract: The invention relates to a method carried out by a navigation satellite system (NSS) receiver or a processing entity receiving data therefrom, for estimating parameters useful to determine a position. The NSS receiver observes NSS signals from NSS satellites. Two filters, called “robustifier” and “main estimator” respectively, both use state variables and compute the values thereof based on: NSS signals observed by the NSS receiver, and/or information derived therefrom. The robustifier identifies, within the input data, measurements that do not match a stochastic model assigned thereto. For each identified measurement, the robustifier rejects the measurement, adjusts the stochastic model assigned to the measurement, and/or corrects the measurement. The robustifier uses fewer state variables than the main estimator. A corresponding system is also disclosed.

Abstract: A positioning device (4) is disclosed comprising at least one antenna (14, 16) for receiving ranging signals, such as GNSS signals. The device comprises a local oscillator (18) for providing a local frequency or phase reference and an inertial sensor (22) for measuring a movement of the device. A processor (36) is provided for performing calculations. The device can receive a first reference signal at a known or predictable frequency or phase. A local oscillator offset determination module (26) is provided to calculate an offset to the received frequency or the received phase based on the movement of the receiver in the direction of the first reference source. A local signal generator (28) can then use the local frequency or phase reference from the local oscillator (18), and the offset calculated by the local oscillator offset determination module (26), to provide a local signal using a local signal generator (28).

Abstract: Various embodiments each include systems, methods, devices, or software for integer ambiguity resolution approach over a time window of GNSS/IMU data. One purpose of processing a window of data is to enhance the reliability of obtaining high-accuracy position estimation, using carrier-phase measurements, even in challenging environments.

Abstract: An image-aided GPS navigation deployed on a vehicle may include a GPS receiver configured to estimate the position of the vehicle based on signals received from one or more GPS satellites. The navigation system may also include an imager configured to capture image frames associated with an environment through which the vehicle travels and estimate the relative motion of the vehicle through the environment based at least in part on the image frames. The navigation system may also include a navigation processor configured to receive the position estimation from the GPS and the relative motion estimation, and determine an updated position estimation based at least in part on the relative motion estimation.

Abstract: This provides methods and systems for V2X applications, such as forward collision warning, electronic emergency brake light, left turn assist, work zone warning, signal phase timing, and others, mainly relying on a GNSS positioning solution transmitted via the Dedicated Short-Range Communications (DSRC) to/from the roadside units and onboard units in other V2X-enabled vehicles. However, the positioning solution from a GNSS may be deteriorated by noise and/or bias due to various error sources, e.g., time delay, atmospheric effect, ephemeris effect, and multipath effect. This offers a novel quality filter that can detect noise and the onset of drift in GNSS signals by evaluating up to four metrics that compare the qualities of kinematic variables, speed, heading angle change, curvature, and lateral displacement, obtained directly or derived from GNSS and onboard vehicle sensors. This is used for autonomous cars and vehicle safety, with various examples/variations.

Abstract: Provided is a positioning terminal of a global navigation satellite system configured to: receive a plurality of navigation signals and an augmentation signal from a plurality of navigation satellites and an augmentation satellite; acquire, in a process of causing each value of error causes including an ambiguity to converge through a plurality of times of observation to enhance an accuracy of positioning through continuous observation, each value of a position of the positioning terminal recorded in advance in a storage area to calculate each value of the error cause, and use the calculated each value as an initial value and/or one value to be added for the continuous observation to cause each value of the error cause to converge; and successively perform positioning calculation.

Abstract: A GPS-enabled cellular electronic device is operated in an indoor mode. An increase in strength of a cellular signal is detected at the GPS-enabled cellular electronic device. Responsive at least to the increase in cellular signal strength, the GPS-enabled cellular electronic device is transitioned to an outdoor testing mode. Detecting is carried out to determine whether movement of the GPS-enabled cellular electronic device occurs during the outdoor testing mode. If so, the GPS-enabled cellular electronic device is transitioned to an outdoor mode.

Abstract: A vehicle position detecting apparatus includes: a position measurement unit that obtains first position information of a first vehicle; an autonomous sensor that obtains relative position information of a second vehicle; a receiver that receives communication data containing second position information of the second vehicle; an identification unit that performs identification on the second vehicle specified based on the relative position information and the second vehicle from which the communication data is sent; a position error calculator that calculates a position error between a position of the second vehicle specified based on the relative position information and that of the second vehicle specified based on the second position information; and a position corrector that performs, based on the position error, a correction on the position of the second vehicle specified based on the second position information, on a condition that the identified second vehicle is no longer detected by the autonomous sen

Abstract: A method of determining a position of a GNSS device includes receiving GNSS signals at the GNSS device from a plurality of GNSS satellites. The GNSS device generates GNSS raw data based on the GNSS signals. The GNSS raw data is stored on the GNSS device. The GNSS device receives first correction data and second correction data. The first correction data and the second correction data are generated from data from at least one reference station. Third correction data is determined based on the first correction data, the second correction data, and the GNSS raw data. Position data for the GNSS device is determined based on the third correction data and the GNSS raw data.

Abstract: A method of determining a trajectory of a mobile platform includes obtaining a satellite positioning system (SPS) measurement from one or more SPS signals acquired by an SPS receiver of the mobile platform. The method also includes obtaining a visual-inertial odometry (VIO) measurement of the mobile platform from a VIO system of the mobile platform. A first position estimate of the mobile platform is determined based, at least in part, on the SPS measurement and the VIO measurement. The method then includes adjusting the first position estimate to generate a smoothed position estimate based, in part, on a smoothing parameter that controls a smoothness of the trajectory. The trajectory of the mobile platform is then determined, at least in part, using the smoothed position estimate.

Abstract: The invention, in some embodiments, relates to the field of global navigation satellite systems, and more particularly to the field of methods and devices for improving accuracy of position determination by receivers of global navigation satellite systems. Some embodiments of the invention relate to methods for generating a three-dimensional (3-D) representation of an urban area by a receiver of a global navigation satellite system using blocked lines of sight to satellites of the system. Additional embodiments of the invention relate to methods for transmitting a three-dimensional (3-D) representation of an urban area by a receiver of a global navigation satellite system for improving calculation of location by the global navigation satellite system receiver.

Abstract: The invention relates to an apparatus and method for augmenting the 3 dimensional position information obtained from the NAVSTAR satellite-based global positioning system (“GPS”) system. Such systems can be impacted by physical obstacles that prevent the receipt of the satellite signals or as a result of sun spot activity that introduces noise into the signals thus causing them to become intermittently unavailable and/or making them less accurate in the course of normal operation. Therefore, an improved positioning solution that can operate under such poor GPS operational conditions is needed. The apparatus and method of the invention augments GPS with dead reckoning techniques when GPS signals are unavailable or inaccurate. The apparatus and method of the invention demonstrates highest value when applied to blasthole drill positioning applications in open-pit mines.

Abstract: A device for mitigating a first group delay of a lowpass filter configured to lowpass filter a first channel coefficient of a set of channel coefficients with respect to time, includes a prediction filter configured to filter a data sequence derived from a lowpass filtered first channel coefficient to generate a prediction value of the lowpass filtered first channel coefficient; and an adjustment circuitry configured to adjust the prediction filter to generate the prediction value having a second group delay that is less than the first group delay.

Abstract: Methods and systems for evaluating the quality of a location-determination algorithm of a mobile device are described. An example method may involve receiving a log of sensor data that may include sensor values output by given sensors of a mobile device over a time period, and at least one location estimate for at least one respective point in time within the time period. One or more processors may then determine, using the sensor values, an estimated trajectory that includes a plurality of computed ground-truth locations of the mobile device over the time period. Further, the method may involve determining a difference between a given location estimate and a computed ground-truth location of the plurality of computed ground-truth locations. And the method may involve providing an output indicative of whether the determined difference satisfies a predetermined threshold.

Abstract: A positioning system includes an on-board device that includes a positioning signal receiver that receives positioning signals from plural artificial satellites, a signal generator that generates a correction signal for correcting a positioning result based on the plural positioning signals, and a broadcast distribution unit that employs a geostationary satellite to distribute the correction signal together with another broadcast signal. The signal generator generates plural of the correction signals corresponding to plural distribution target regions set such that the entire area of a distribution target is covered. The broadcast distribution unit simultaneously distributes all the plural correction signals to each of the plural distribution target regions.

Abstract: System and methods for generating and employing coherent multicarrier correlation can include receiving, from a transmitter, a plurality of radio frequency (RF) signals associated with a respective plurality of nominal carrier components. A processing circuitry can remove from each received RF signal the respective nominal carrier component to generate a corresponding baseband signal. The processing circuitry can generate, for each baseband signal, a respective correlation signal using the baseband signal and a reference signal. The processing circuitry can incorporate, to each correlation signal, the respective nominal carrier component of the RF signal associated with that correlation signal to generate a respective single-carrier correlation signal. The processing circuitry can aggregate the single-carrier correlation signals to generate a multi-carrier correlation signal.

Abstract: A positioning signal from a satellite positioning system is received at a mobile station, correction information from a reference station is used, a pseudo distance observation formula using a code and a phase distance observation formula using a carrier wave are used to perform positioning using single frequency at the mobile station, and these observation formulas are expressed by a satellite clock error, clock errors at the reference station and the mobile station, a ionospheric delay and a tropospheric delay, and a code bias and a phase bias of single frequency at the reference station, the mobile station and a satellite.

Abstract: In the field of satellite geolocation, a geopositioning method with a trust index is implemented by a geopositioning terminal. According to the method, the positioning of the terminal is estimated by geopositioning satellites and the trust index is provided by comparison with at least one pseudo-distance measurement recorded by at least one additional geopositioning satellite, which is different from those used to compute the position of the terminal.

Abstract: The invention introduces “crossed” navigation message authentication, which comprises a) generation and transmission of unpredictable bits periodically from satellites currently not connected to the ground mission segment and b) generation of digital signatures for the data from these satellites, and the transmission thereof through satellites that currently are connected to the ground mission segment. An attacker cannot spoof the navigation message as it contains an unpredictable bit pattern that is verified a few seconds later through a digital signature.

Abstract: A Ground-Based Augmentation System (GBAS) includes a plurality of Global Navigation Satellite System (GNSS) reference receivers configured to receive and process GNSS satellite measurements.

Abstract: A DGNSS-based guidance system, wherein a rover receiver first utilizes data from a master base station transceiver, a DGNSS reference network, or some other differential source to compute a differentially corrected location to establish a reference DGNSS relationship. Using this location and data observed only at the rover, the rover computes an internal set of differential corrections, which set is stored in computer memory, updated as necessary, and applied in future times to correct observations taken by the rover. As the rover enters into areas of other base station receiver reference networks, the rover transceiver will send positional information it receives from the master base station to the new, secondary base station. The secondary base station then calibrates its own reference information using information sent from the original master base station.