Abstract: A position specifying device communicable with a transmitter supporting Bluetooth Low Energy (BLE) is provided. The position specifying device includes: a signal receiving unit configured, by using multiple antennas each having different directivity, to receive BLE radio signals transmitted from the transmitter and to measure respective receiving strengths of the BLE radio signals; and a specifying unit configured to specify a position of the transmitter by comparing the respective receiving strengths measured via each of the multiple antennas.

Abstract: Apparatus and related methods are provided for evaluating effectiveness of a visual augmentation system (VAS), such as night vision goggles (NVGs). The apparatus and methods illustratively measure the response time of the visual augmentation system (VAS) as a function of targeting detection, engagement, and scan angle.

Abstract: An alignment tool and a method are disclosed for alignment of a reflector arrangement. The reflector arrangement comprises a flat reflective surface which is configured to reflect an electromagnetic wave signal between a first antenna site and a second antenna site. The alignment tool comprises a camera circuit for capturing images of a field-of-view, an input circuit configured to receive a user input comprising the field-of-view coordinates of the first antenna site, a processing circuit configured to compute alignment information from the user input, and a display circuit configured to display the field-of-view and the alignment information.

Abstract: A method for determining geo-position of a target by an aircraft includes: receiving navigation data related to the aircraft including aircraft attitude information; receiving multilateration information related to the target including an angle to the target; calculating an axis for a cone fixed to the aircraft, based on the received aircraft attitude information; calculating a central angle for the cone from the received angle to the target; generating two vectors orthogonal to the cone axis; calculating a cone model from the axis, the central angle and the two vectors; and intersecting the cone model with an earth model to obtain a LEP curve, wherein the LEP curve is used to determine the geo position of the target.

Abstract: In accordance with an example embodiment, an apparatus comprises at least one receiver configured to receive a grid corresponding to an area, at least one processor configured to assign at least one access point in the area to at least one node in the grid, and the at least one processor configured to select a predetermined number of access points assigned to the at least one node for inclusion in a partial radio map.

Abstract: A positioning system uses radio wave strengths of radio waves received from first and second wireless transmission terminals movable through an indoor space to locate positions of the terminals. The positioning system includes plural wireless receivers disposed in the indoor space, and a position estimating component that estimates the positions of the terminals based on positions of the receivers using first and second position estimation data in a limited range of the reception data generatable by the receivers. The receivers detect the radio wave strengths and can generate reception data including information relating to the radio wave strengths. At least one of the position estimating component and the receivers acquires the first and second position estimation data limited to first and second set regions suited to the first and second wireless transmission terminals from the reception data receivable relating to the first and second wireless transmission terminals, respectively.

Abstract: Systems and methods are presented for sharing the ultra-wide band (“UWB”) spectrum. The systems and methods can include allocating a designated time slice for UWB position determination signals on a primary basis to ensure that the UWB transmissions would be free of interference. The systems and methods can also include synchronizing a plurality of UWB transceivers and emitting synchronized pulses, during the designated time slice.

Abstract: The present disclosure relates to an acoustic position determination system that includes a mobile communication device and at least one base transmitter unit. The mobile communication device is configured to transmit and receive acoustic signals. Due to relative movements between the mobile communication device and the base transmitter unit, frequencies of the received signals shift due to Doppler effect. The mobile communication device is configured to compensate Doppler frequency shifts in the received acoustic signals prior to performing a deconvolution decoding process. The mobile communication device is further configured to compensate Doppler frequency shifts and perform deconvolution decoding process on acoustic signals received from multiple signal transmission paths.

Abstract: A system and method using a hybrid-weighted, multi-gridded robust approach to localize a sound source are more accurate and robust that conventional techniques. In one embodiment, the system may determine a distance to the acoustic source using a first grid and weighting combination, may determine an angle to the acoustic source using a second grid and weighting combination and may combine the distance and angle estimates to generate a more robust and accurate acoustic source location determination.

Abstract: A radar sensing system for a vehicle has multiple transmitters and receivers on a vehicle. The transmitters are configured to transmit radio signals which are reflected off of objects in the environment. There are one or more receivers that receive the reflected radio signals. Each receiver has an antenna, a radio frequency front end, an analog-to-digital converter (ADC), and a digital signal processor. The transmitted signals are based on spreading codes generated by a programmable code generation unit. The receiver also makes use of the spreading codes generated by the programmable code generation unit. The programmable code generation unit is configured to selectively generate particular spreading codes that have desired properties.

Abstract: A system for providing integrated detection and deterrence against an unmanned vehicle including but not limited to aerial technology unmanned systems using a detection element, a tracking element, an identification element and an interdiction or deterrent element. Elements contain sensors that observe real time quantifiable data regarding the object of interest to create an assessment of risk or threat to a protected area of interest. This assessment may be based e.g., on data mining of internal and external data sources. The deterrent element selects from a variable menu of possible deterrent actions. Though designed for autonomous action, a Human in the Loop may override the automated system solutions.

Abstract: Provided are signal processing apparatus, a signal processing method, and an object detection system that enable an object detection to be accurately performed. A stereo camera performs imaging by a right camera and a left camera to acquire a stereo image. A millimeter wave radar acquires a radar image in which a position of an object is detected in a radiation range of millimeter waves based on millimeter waves. Further, by communication via a communication apparatus with a target of which positional information is known, it is determined whether or not the target is reliable, and in a case where it is determined that the target is reliable, calibration processing is performed for eliminating a deviation in coordinate systems generated in the stereo image and the radar image in which the target is detected.

Abstract: A method for estimating phase noise of an RF oscillator signal in a frequency-modulated continuous-wave (FMCW) radar system and related radar devices are provided. The method includes applying the RF oscillator signal to an artificial radar target composed of circuitry, which applies a delay and a gain to the RF oscillator signal, to generate an RF radar signal. Furthermore, the method includes down-converting the RF radar signal received from the artificial radar target from an RF frequency band to a base band, digitizing the down-converted RF radar signal to generate a digital radar signal, and calculating a decorrelated phase noise signal from the digital radar signal. A power spectral density of the decorrelated phase noise is then calculated from the decorrelated phase noise signal, and the power spectral density of the decorrelated phase noise is converted into a power spectral density of the phase noise of an RF oscillator signal.

Abstract: Embodiments are provided for a radar device and a method for operating a radar device, the radar device having a transmitter and a receiver, the method including: generating a noise signal; mixing the noise signal with a transmitter output radio frequency (RF) signal to produce an intermediate signal, wherein the transmitter output RF signal is a version of a local oscillator (LO) signal having linearly increasing frequency; attenuating the intermediate signal to produce a test signal; adding the test signal to a receiver input RF signal to produce a combined receiver input RF signal; downmixing an amplified version of the combined receiver input RF signal with the LO signal to produce a combined low frequency signal; and correlating the combined low frequency signal with the noise signal to produce an error detection signal.

Abstract: Radio frequency motion sensors may be configured for operation in a common vicinity so as to reduce interference. In some versions, interference may be reduced by timing and/or frequency synchronization. In some versions, a master radio frequency motion sensor may transmit a first radio frequency (RF) signal. A slave radio frequency motion sensor may determine a second radio frequency signal which minimizes interference with the first RF frequency. In some versions, interference may be reduced with additional transmission adjustments such as pulse width reduction or frequency and/or timing dithering differences. In some versions, apparatus may be configured with multiple sensors in a configuration to emit the radio frequency signals in different directions to mitigate interference between emitted pulses from the radio frequency motion sensors.

Abstract: A dynamic road surface detecting method based on a three-dimensional sensor is provided. The three-dimensional sensor receives a plurality of laser-emitting points reflected from a road surface to generate a plurality of three-dimensional sensor scan point coordinates which is transmitted to a point cloud processing module. The point cloud processing module transforms the three-dimensional sensor scan point coordinates to a plurality of vehicle scan point coordinates according to a coordinate translation equation, and then transforms a plurality of vehicle coordinate height values of the vehicle scan point coordinates to a road surface height reference line according to a folding line fitting algorithm. An absolute difference of two scan point height values of any two adjacent scan points on each of the scan lines is analyzed to generate a discontinuous point. The point cloud processing module links the discontinuous points to form a road boundary.

Abstract: A light detection and ranging (LiDAR) optical system, according to one embodiment of the present invention, comprises: a first mirror which is disposed to make a predetermined first angle with a horizontal plane and has a first hollow; a light source for outputting a pulse laser from the lower portion of the first mirror; a second mirror which is disposed to make a predetermined second angle with the first mirror so that the pulse laser passes through the first hollow and travels to a measurement target; at least two path control mirrors which reflect the pulse laser so that the path of the pulse laser is formed on a reflective surface of the second mirror; a light receiving lens for receiving, from the lower portion of the first mirror, light which has been reflected through the first mirror.

Abstract: Laser spot detecting device including a plurality of elementary optoelectronic detectors that are each connected to an elementary pulse detecting circuit, each elementary pulse detecting circuit including a comparator and a memory module that is connected to one output of the comparator, the memory modules being connected to a multiplexing circuit having an output forming a digital spatial output of the laser spot detecting device. The laser spot detecting device further more includes a global OR circuit having inputs connected to the outputs of the comparators and having an output forming a real-time digital temporal output of the laser spot detecting device. Method for detecting a laser spot implemented by such a detecting device.

Abstract: Methods and apparatus for recording and analyzing echolocation calls using zero crossing and/or digital sampling (full spectrum analysis) techniques, and for optimizing trigger thresholds used to activate recording in response to detection of an echolocation call.

Abstract: A method for processing a measurement signal that is captured by a measuring device, wherein, in order to capture the measurement signal, the measuring device emits a transmission signal and receives a component of the transmission signal that is reflected by an object as a reception signal, wherein a first phase difference between a first target phase position and a first actual phase position contained in the measurement signal is determined, and wherein a second phase difference between a second target phase position and a second actual phase position contained in the measurement signal is determined, and a phase difference progression in the form of an, in particular, linear, functional relationship is determined on the basis of the first and the second phase differences, and a measured value is determined by means of the functional relationship.

Abstract: A detection device for detecting the presence of a living being at a predetermined location within a monitored area comprises an evaluation unit configured to evaluate radar radiation received by a radar unit from an assigned radar area included in said monitored area in response to radar radiation emitted by said radar unit to detect if a living being is present within said radar area and to localize a detected living being within said radar area, and a detection unit configured to correlate the location of a detected living being in said radar area with a set of predetermined locations in said monitored area to detect the presence of a living being at a predetermined location of said monitored area.

Abstract: An interrogator and system employing the same. In one embodiment, the interrogator includes a receiver configured to receive a return signal from a tag and a sensing module configured to provide a time associated with the return signal. The interrogator also includes a processor configured to employ synthetic aperture radar processing on the return signal in accordance with the time to locate a position of the tag.

Abstract: In one embodiment, a system comprising a machine configured to traverse a field having windrows; a radar sensor mounted to the machine, the radar sensor arranged to transmit first signals to, and receive first reflected signals from, one of the windrows and the field adjacent the one of the windrows; a lidar sensor mounted to the machine, the lidar sensor arranged to transmit second signals to, and receive second reflected signals from, the one of the windrows and the field adjacent the one of the windrows; and a processing circuit configured to receive data corresponding to the first and second reflected signals and determine a mass profile and a geometric profile of the one of the windrows based on the data.

Abstract: A controller comprises a communication interface to receive an anchor localization dataset comprising a plurality of anchor range measurements and a processing circuitry to identify a qualified subset of anchor range measurements from the anchor localization dataset, wherein the anchor range measurements in the qualified subset are consistent, select a first anchor range measurement in the anchor localization dataset from outside the qualified subset of anchor range measurements, and add the first anchor range measurement to the qualified subset of anchor range measurements when the first anchor range measurement is consistent with the anchor range measurements in the qualified subset of anchor range measurements.

Abstract: Systems and methods in accordance with various embodiments of the present disclosure provide high efficiency synthetic aperture radar satellite designs that achieve higher power efficiency and higher antenna aperture size to satellite mass ratios than the current state of the art. In various embodiments, a high efficiency synthetic aperture radar satellite includes a satellite bus and a parabolic reflector antenna coupled to the satellite bus. The satellite system may further include a traveling wave tube amplifier configured to drive the parabolic reflector antenna, and a body-mounted steering system configured to mechanically steer the satellite system to direct the parabolic reflector antenna. The satellite system may further include a processor configured to combine the pulse reflections and generate image data representing the region of interest, in which the image data is effectively obtained with a synthetic aperture greater than the actual antenna aperture.

Abstract: Synthetic aperture radar transmit and receive antenna systems and methods of transmitting and receiving radar signals are disclosed. In one embodiment, a transmit and receive antenna system includes a transmit antenna array configured to transmit a plurality of radio frequency transmit signals, the transmit antenna array including a plurality of patch antenna elements mounted to a printed circuit board, each patch antenna element belonging to a subarray, and one or more power amplifiers, each power amplifier feeding a subarray of the patch antenna elements, and a reflectarray receive antenna configured to receive radio frequency signals including a plurality of reflectarray antenna elements mounted to a printed circuit board, at least one antenna feed configured to receive radio frequency signals reflected from the plurality of reflectarray antenna elements, and at least one low noise amplifier electrically connected to the at least one antenna feed.

Abstract: Disclosed systems and methods include a multiple-in-multiple-out (“MIMO”) antenna array, wherein the arrangement of antenna elements provide relatively good angular resolution for RADAR while reducing the presence of grating lobes. Transmitter and receiver antenna elements can be spaced such as to improve performance with reduced cost. In some embodiments, the transmitter and/or receiver antenna elements can be spaced at unit distances of a half-wavelength +/?10% or +/?25%. In some embodiments, the first receiver antenna element is at a four-unit distance from a second receiver antenna element, a third receiver antenna element at a one-unit distance from the second receiver antenna element, and a fourth receiver antenna element at a two-unit distance from the third receiver antenna element.

Abstract: A forward sensing system for a vehicle includes a radar sensor and an image sensor housed in a self-contained unit disposed behind and attached at the vehicle windshield. A control includes an image processor that has an image processing chip that processes image data captured by the image sensor to detect an object of interest present exterior of the vehicle. The control, responsive at least in part to processing of captured image data and to sensing by the radar sensor, determines that a potentially hazardous condition exists in a path of forward travel of the vehicle. The radar sensor and the image sensor collaborate in a way that enhances sensing capability of the sensing system. Responsive to determination that the object of interest is in the path of forward travel of the vehicle, the control may at least in part control a driver assistance system of the vehicle.

Abstract: An outside sensor unit includes an outside sensor, a main bracket, a support bracket, and a cover member. The main bracket is attached to a vehicle body. The support bracket supports the outside sensor and is attached to the main bracket rotatably adjustably. The cover member covers an outer circumference in an outside detection direction of the outside sensor. The main bracket has a base wall that is attached to the support bracket rotatably adjustably and an attachment seat that is arranged at a position which is offset in the outside detection direction of the outside sensor with respect to the base wall. The cover member is attached to the attachment seat.

Abstract: An ultrasonic sensor control method includes outputting a first sensing signal, comparing a voltage value of a first reflection signal corresponding to the first sensing signal with a predetermined reference voltage value, determining a conversion method of the first reflection signal according to a voltage value comparison result, converting the first reflection signal according to a determined conversion method, and detecting an object by comparing a converted first reflection signal with a predetermined reference reflection signal.

Abstract: In a method of operating a two-dimensional array of ultrasonic transducers, a plurality of array positions comprising pluralities of ultrasonic transducers of the two-dimensional array of ultrasonic transducers is defined, the plurality of array positions each comprising a portion of ultrasonic transducers of the two dimensional array of ultrasonic transducers. For each array position of the plurality of array positions, a plurality of ultrasonic transducers associated with the respective array position are activated. The activation includes transmitting ultrasonic signals from a first group of ultrasonic transducers of the plurality of ultrasonic transducers, wherein at least some ultrasonic transducers of the first group of ultrasonic transducers are phase delayed with respect to other ultrasonic transducers of the first group of ultrasonic transducers, the first group of ultrasonic transducers for forming a focused ultrasonic beam.

Abstract: An ultrasonic doppler motion sensor device includes a transmitter (10, 12) for emitting a continuous ultrasonic transmission signal in a detection space, an ultrasonic receiver (20, 22) for detecting the ultrasonic transmission signal reflected by the detection object as a receive signal, and a mixer and detector (14, 18) for mixing the ultrasonic transmission signal or a signal derived therefrom with the receive signal and/or for demodulating the receive signal and for generating a motion detection signal therefrom, wherein the mixer and detector are assigned a system (14) for the adjustable generation of a phase shift greater than 0° between a phase of the ultrasonic transmission signal and a periodic impulse signal at the mixer or detector for scanning and mixing the receive signal.

Abstract: Systems and methods are disclosed where a ladar system synthetically fills a ladar frame. A ladar transmitter can employ compressive sensing to interrogate a subset of range points in a field of view. Returns from this subset of range points correspond to a sparse ladar frame, and interpolation can be performed on these returns to synthetically fill the ladar frame.

Abstract: Embodiments of the disclosure provide an apparatus, system, and method for detecting light returned from an object. The apparatus includes a plurality of lenses. Each lens is configured to collect light from a respective direction. The apparatus also includes a plurality of receivers. At least one of the plurality of receivers corresponds to one of the plurality of lenses and is configured to convert the light collected by the corresponding lens into an electrical signal. The apparatus further includes a multiplexer operatively coupled to the plurality of receivers and configured to select at least one of the plurality of receivers to output the corresponding electrical signal. The selected at least one receiver corresponds to the lens collecting the light returned from the object.

Abstract: An apparatus is provided for using a square wave digital chirp signal for optical chirp range detection. A laser source emits an optical signal and a RF waveform generator generates an input digital chirp signal based on the square wave digital chirp signal. A frequency of the optical signal is modulated based on the input digital chirp signal. A splitter divides the optical signal into a transmit optical signal and a reference optical signal. A detector combines the reference optical signal and a return optical signal from an object. The detector generates an electrical output signal based on the combined reference optical signal and the return optical signal. A processor determines a range to the object based on a characteristic of a Fourier transform the electrical output signal. A method is also provided for using the square wave digital chirp signal for optical chirp range detection.

Abstract: A lidar including a laser having a first frequency-modulated laser radiation and a second frequency-modulated laser radiation, a first waveguide coupled to the laser, wherein the first frequency-modulated laser radiation and the second frequency-modulated laser radiation are transmitted by the laser into the first waveguide, a second waveguide, a filter coupled between the first waveguide and the second waveguide, wherein the filter is configured to couple and pass the first frequency-modulated laser radiation through the filter to the second waveguide, and is configured to not couple or pass the second frequency-modulated laser radiation through the filter to the second waveguide, and a photodetector coupled to the second waveguide.

Abstract: A method is disclosed to determine a traveling time for a plurality of received light pulses that reflected and returned from an object. Each returned light pulse is associated with a timestamp indicating a time between a transmission time of a corresponding light pulse and a time of arrival of the returned light pulse. For each timestamp, a number C is determined of time stamps that are subsequent to the timestamp and within a predetermined time window after the timestamp. A maximum number C is determined, and an index i is determined for the maximum number C. A traveling time is determined for the plurality of light pulses as an average of the timestamp having a same index as the maximum number C and timestamps that are within the predetermined time window after the timestamp having the same index as the maximum number C.

Abstract: An electronic home plate provides assistance to an umpire in determining whether a pitch results in a “strike” or a “ball.” The home plate is implemented with LEDs producing discrete pulses of infrared light beams extending vertically. As a moving ball intersects the pulses, light from the pulses is scattered and incident on photodetectors embedded in the home plate, producing a series of data points. Two stages of light compensation compensate the data points for ambient light, first by applying an offset current to a photodetector through a PNP transistor, and second by subtracting a measurement immediately before a pulse from a measurement during the pulse. A processor then fits the data points to a curve, to compute vertical and lateral positions of the ball, thereby determining whether the pitch passed within a strike zone. Other applications may similarly analyze the trajectory of other projectiles for various purposes.

Abstract: A light detection and ranging (LIDAR) time of flight (TOF) sensor for inputting and outputting simultaneously and 3-dimensional laser scanning system including the same are disclosed. In one aspect, the sensor includes a substrate and a light receiving element array provided on the substrate and including a plurality of light receiving elements. The sensor also includes readout circuits configured to receive electrical signals from the light receiving elements and perform signal processing on the electrical signals. The sensor further includes metal lines disposed on the light receiving element array in parallel, provided to correspond to the number of the light receiving elements, and configured to connect the light receiving elements to the readout circuits in one-to-one correspondence.

Abstract: The present disclosure relates to methods and systems that facilitate determination of a pose of a vehicle based on various combinations of map data and sensor data received from light detection and ranging (LIDAR) devices and/or camera devices. An example method includes receiving point cloud data from a (LIDAR) device and transforming the point cloud data to provide a top-down image. The method also includes comparing the top-down image to a reference image and determining, based on the comparison, a yaw error. An alternative method includes receiving camera image data from a camera and transforming the camera image data to provide a top-down image. The method also includes comparing the top-down image to a reference image and determining, based on the comparison, a yaw error.

Abstract: A distance measuring device includes a plurality of image taking parts, a first distance information acquisition part that acquires distance information of an object for distance measuring from taken images that are taken by the plurality of image taking parts, an electromagnetic wave emission part that emits an electromagnetic wave, a reflected-wave receiving part that receives a reflected wave of an electromagnetic wave emitted from the electromagnetic wave emission part, and a second distance information acquisition part that acquires distance information of the object for distance measuring from a reflected wave received by the reflected-wave receiving part, wherein irradiation with an electromagnetic wave emitted from the electromagnetic wave emission part is executed under optical axes of the plurality of image taking parts.

Abstract: The invention relates to a method and system for the validation of satellite-based positioning. The system comprises a radio navigation device (10) installed on board a mobile carrier (2), including a satellite geo-positioning device (12) able to receive a composite radio signal including a plurality of radio navigation signals each transmitted by a transmitting satellite and including time-synchronization and position-reference information, the radio navigation device being able to carry out processing of the received radio navigation signals to calculate first navigation information including information on the geographical position, speed and time of the carrier. The radio navigation device (10) is capable of transmitting baseband digitized signals (IF1, . . .

Abstract: A method and system for deploying a trusted-global positioning system (trusted-GPS) positioning map. The method comprises receiving, at a memory of the server computing device, at least a first set of fingerprint data and at least a first set of GPS position data for a sequence of positions traversed within an indoor area by at least a first mobile device, generating, using the processor, a distribution of positioning data points of the indoor area for which a correlation between the at least a first set of fingerprint data and the at least a first set of GPS position data for respective ones of the sequence of positions exceeds a threshold correlation value, and when the distribution exceeds at least one of a predetermined and a dynamically updated threshold density of positioning data points, deploying the distribution as the trusted-GPS positioning map of the indoor area.

Abstract: A system and method provides an Automotive Safety Integrity Level (ASIL) qualifier for Global Navigation Satellite System (GNSS) position and related values. Specifically, hardware platform diagnostics are executed on one or more platforms associated with a GNSS Position Sensor (GNSSPS) that calculates/obtains position and/or related values. Also, a Receiver Autonomous Integrity Monitoring (RAIM) algorithm is executed on the calculated/obtained position and/or related values. If the results both produce a “good” qualifier, the position and/or related values is assigned an ASIL qualifier of “good” and may be utilized by an ASIL rated system. If either of the qualifiers is a “bad” qualifier, the position and/or related values is assigned an ASIL qualifier of “bad” and cannot be utilized by the ASIL rated system. In addition, the inventive system and method may compute a probability associated with an integrity violation of the RAIM algorithm which may consider the probability of hardware failure.

Abstract: A measuring system comprises a model generation unit and a signal generator. The model generation unit is adapted to generate a signal model based upon received global navigation satellite system reception data. The signal generator is adapted to generate a measuring signal based upon the signal model and to supply a device under test with the measuring signal.

Abstract: A position and azimuth measurement device capable of measuring geographical coordinates and azimuth angles and a surveying device are provided. The position and azimuth measurement device includes a GNSS device, having a GNSS antenna for obtaining position information thereof; a horizontal rotating section capable of rotating the GNSS antenna horizontally; a leveling section capable of leveling the horizontal rotating section; a horizontal angle detector configured to detect a horizontal angle of the horizontal rotating section; and a control device. The control device causes the GNSS device to continuously obtain the position information while causing the horizontal rotating section leveled by the leveling section to make one full rotation, and computes geographical coordinates and an azimuth angle on the basis of the position information obtained throughout the full rotation.

Abstract: It is proposed a determination device, a method for determining navigation information and a navigation device comprising: a receiving circuit configured to receive a first signal from a first navigation satellite, the first signal comprising a first timestamp; a determination circuit configured to determine a velocity of the first navigation satellite at the first timestamp in a second coordinate system based on ephemeris data of the first navigation satellite, the second coordinate system being tilted in relation to the equatorial plane; the determination circuit further configured to determine a velocity of the first navigation satellite in a first coordinate system that is earth fixed and rotating with earth, by applying a transformation matrix to the determined velocity of the first navigation satellite in the second coordinate system and adding a correction term based on a time derivative of the transformation matrix; a navigation circuit configured to determine navigation information of the receiving c

Abstract: The invention concerns a satellite geopositioning method on the basis of satellites each transmitting dual-frequency signals. The method comprises, for each satellite, a step of computation of four pseudo-distances on the basis of the two codes and the two carriers of the received dual-frequency geopositioning signals, a step of correction of the ionospheric delays over each computed pseudo-distance by applying an ionospheric error propagation model, a step of carrier code smoothing using a Kalman filter in order to provide a pseudo-distance measurement without measurement noise and to correct the residual ionospheric error. The position is estimated by using the corrected pseudo-distances computed for each satellite.

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 over multiple epochs. A first filter, called “timely estimator”, and second filter, called “precise estimator” and delayed with respect to the timely estimator, are operated. The estimators use state variables, and make use of NSS signals observed by the NSS receiver or information derived therefrom. The precise estimator further computes its state variable values based on observations that are not derived from NSS signals observed by the NSS receiver. The values of some of the state variables computed by the timely estimator are recurrently replaced by values from the precise estimator. A corresponding system is also disclosed.

Abstract: A system and method for improving the accuracy of a user device when generating map/navigation information for display to a user, comprising: obtaining compass heading from a magnetometer of the user device located within a vehicle; adjusting the compass heading based on a mount angle of the user device within the vehicle; obtaining location data from a location sensor of the user device; determining if a course of the vehicle can be reliably determined from the location data; if the course of the vehicle cannot be reliably determined from the location data, determining the orientation of the vehicle using the compass heading but not the course; if the course of the vehicle can be reliably determined from the location data, calculating a course of the vehicle based on the location data and determining the orientation of the vehicle using the course; generating, by a processor, first map/navigation information using the orientation of the vehicle; and displaying, by a processor, the first map/navigation inform