Class / Patent application number | Description | Number of patent applications / Date published |
342357610 | Multipath-related issues (IPC) | 26 |
20100265133 | Method for suppressing multipath errors in a satellite navigation receiver - A method of multipath error suppression in a satellite navigation receiver, including steps of navigation satellites signals searching, receiving and processing complex signals from each satellite, tracking found signals with a following-up open loop and determining coordinates, receiver velocity and exact time based on measurements of direct and reflected signal delay and Doppler frequency, the method including: forming, on the basis of navigation parameters, a two-dimensional accumulated power grid, calculating single-path signal corrections using the centered accumulated power grid determining, whether a multipath is presented, and performing, in case of positive result of this determination, improvement of corrections using weights, wherein, performing improvement of corrections using weights is carried out by forming a likelihood function on the basis of a centered accumulated powers vector, and correction is performed according to the found likelihood function global maximum. | 10-21-2010 |
20100328151 | MULTIPATH SIGNAL EVALUATION METHOD, POSITION CALCULATION METHOD, AND MULTIPATH SIGNAL EVALUATION DEVICE - A multipath signal evaluation method includes, carrying out a correlation calculation on a received signal from a positioning satellite to obtain a peak correlation value, and determining reliability for a received multipath signal by using the peak correlation value and a correlation value at a phase delayed from a peak phase in which the peak correlation is obtained. | 12-30-2010 |
20110080320 | Signal processing techniques for improving the sensitivity of GPS receivers - A system for measuring the pseudo range from a target GPS sensor to a designated navigational satellite, for use in a satellite positioning system (SPS) is comprised of multiple GPS sensors for receiving and recording portions of the signals transmitted by designated navigational satellites, the recordings referred to as datagrams; and means for transmitting the datagrams to a datagram processing facility wherein the pseudo range from the target GPS sensor to the designated navigational satellite is derived. The datagram processing facility for deriving the pseudo range is further comprised of a pseudo range engine for deriving a pseudo range from a datagram originating with said target GPS sensor, the location of which is to be determined, the derivation accomplished with the aid of a perfect reference; a perfect reference engine for generating a perfect reference from one or more satellite-specific datagrams: and a strong signal suppression engine for synthesizing satellite-specific datagrams from I/F signals recorded by reference GPS sensors designated for the express purpose of perfect reference generation. The perfect reference reduces the minimum signal strength required to acquire and accurately track GPS satellites at or near the horizon. | 04-07-2011 |
20110090117 | POSITION ESTIMATION ENHANCEMENT FOR A GLOBAL NAVIGATION SATELLITE SYSTEM RECEIVER - A method of estimating a position of a satellite receiver, comprising computing a weight matrix, and computing an estimated position of the satellite receiver based on the weight matrix, wherein computing the weight matrix includes computing quantities indicative of degradations experienced by satellite signals and of multipath interference, and computing the weight matrix based on the computed quantities. | 04-21-2011 |
20120119951 | Global navigation satellite antenna systems and methods - A method for reducing multipath when determining a location of a stationary or near stationary position, includes receiving a signal from an antenna moving continuously with respect to the stationary or near stationary position, the signal including a multipath component, processing the received signal including the multipath component, wherein multipath error in the received signal is reduced during the processing and determining a location of the stationary or near stationary position based on the processed received signal with the multipath error reduced. | 05-17-2012 |
20120319898 | METHOD OF DETECTING MULTIPATH, GNSS RECEIVING APPARATUS , AND MOBILE TERMINAL - An existence of multipath is detected accurately based on not only a C/No. A C/No (iv) of a reception signal, a pseudorange PR(iv), and a delta range DR(iv) are acquired (S | 12-20-2012 |
20130057430 | APPARATUS AND METHOD FOR CORRECTING POSITION INFORMATION OF PORTABLE TERMINAL IN MULTI-PATH ZONE - An apparatus and method correct position information of a portable terminal in a multi-path zone. The method includes determining whether the portable terminal has entered a multi-path zone, and detecting a second GPS satellite transmitting accurate position information, among one or more first GPS satellites transmitting position information to the portable terminal, when the portable terminal has entered the multi-path zone. The method also includes receiving position information of the portable terminal from the second GPS satellite, and storing coordinates of the second GPS satellite. | 03-07-2013 |
20130162473 | DUAL CIRCULARLY POLARIZED ANTENNA - An antenna includes a waveguide having an aperture at a first end and a conducting component at a second end, the conducting component shorting the waveguide and a first set of two orthogonal dipoles, fed in quadrature, the orthogonal dipoles located near the aperture of the waveguide operating close to its dominant mode cut off frequency. | 06-27-2013 |
20130321202 | Methods and Apparatuses for Multipath Estimation and Correction in GNSS Navigation Systems - The present invention relates generally to methods and apparatuses for estimating and correcting for multipath in GNSS navigation systems. According to some aspects, the invention takes advantage of situations where position and estimated position error are reasonably stable so as to detect when large multipath errors are present with confidence. After detection, the slowly varying biases from multipath or other un-modeled sources can be modeled separately from the navigation state. This makes it possible to keep the measurements in the solution without biasing the navigation state and further ignores the long-term biases for use over short-term periods with minimized pseudorange error when necessary. | 12-05-2013 |
20130335268 | Multipath Isolation Through the Combined Use of Antenna Diversity and Frequency Diversity - A method, system, and apparatus are disclosed for multipath isolation through the combined use of antenna diversity and frequency diversity. In particular, the present disclosure utilizes antenna diversity and frequency diversity to combat the deleterious effects of reflected signals on the positioning accuracy of satellite navigation systems. In at least one embodiment, the present disclosure uses two antennas and two frequencies for operation with a satellite navigation system. The present disclosure segregates the antennas and frequencies into two classes: references and monitors. The reference measurements are used for estimating the state of the vehicle, and the monitor measurements are used to detect faults that might degrade the reference estimation. Thus, the present disclosure enables an improvement in the positioning error experienced by roving users in downtown and indoor environments. Applications include positive train control, aircraft surface guidance, marine craft navigation in canals and ports, as well as automotive lane keeping. | 12-19-2013 |
20140028497 | GLOBAL NAVIGATION SATELLITE ANTENNA SYSTEMS AND METHODS - A method for reducing multipath when determining a location of a stationary or near stationary position, includes receiving a signal from an antenna moving continuously with respect to the stationary or near stationary position, the signal including a multipath component, processing the received signal including the multipath component, wherein multipath error in the received signal is reduced during the processing and determining a location of the stationary or near stationary position based on the processed received signal with the multipath error reduced. | 01-30-2014 |
20140125521 | Method for Estimating the Direction of Arrival of Navigation Signals at a Receiver After Reflection by Walls in a Satellite Positioning System - A method includes estimating a position of a receiver, aboard a moving object, on the basis of the navigation signals emitted by satellites received by an antenna in an antenna array placed on the moving object, and using a three-dimensional geographical map to deduce, geometrically, on the basis of the position of the receiver and of a ray casting starting from the receiver, the number of paths reflected on walls of buildings present in a scene corresponding to an environment surrounding the receiver. The determined number of reflected paths is used to initialize an algorithm for estimating angles of arrival of multi-paths to deduce therefrom angles of arrival of the paths reflected on the walls before reaching the receiver. Optionally, the method can comprise making it possible to bound the distance information error due to a multi-path to render the estimation of direction of arrival of the signals more efficacious. | 05-08-2014 |
20140333476 | METHODS FOR IDENTIFYING WHETHER OR NOT A SATELLITE HAS A LINE OF SIGHT - 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 identifying whether a satellite in a global navigation satellite system has a line of sight to a specific global navigation satellite system receiver (LOS satellite) or does not have a line of sight to the global navigation satellite system receiver (NLOS satellite). | 11-13-2014 |
20150015437 | CODE MINUS CARRIER MULTIPATH OBSERVATION FOR SATELLITE EXCLUSION - A method comprises generating a respective code-carrier difference for each of a plurality of satellite vehicle and signal frequency combinations, wherein the code-carrier difference is based on a code range and a carrier range. The method also comprises filtering the respective code-carrier difference for an unknown bias and random noise; determining whether multipath is present for each of the plurality of satellite vehicle and signal frequency combinations based on the respective filtered code-carrier difference; and computing a position solution based on trust placed in respective measurements from each of the plurality of satellite vehicle and signal frequency combinations, the trust based on whether multipath is present for the respective satellite vehicle and signal frequency combination. | 01-15-2015 |
20150116150 | GNSS Positioning Using Pressure Sensors - Systems, methods and devices for improving the accuracy of GNSS data are provided. Specifically, embodiments of the invention can advantageously use sensor input to improve the accuracy of position fixes. The use of physical 5 sensors in navigation systems is deemed particularly advantageous, especially where altitude data derived from the pressure sensor is calibrated with and/or blended with GNSS altitude data. | 04-30-2015 |
20150138015 | POSITIONING DEVICE - An object is to provide in a positioning device of a moving body such as a vehicle, a technique which can modify a built-in clock error of a moving body to increase accuracy of a velocity. The positioning device includes a built-in clock error estimating unit which estimates a built-in clock error of the vehicle as a built-in clock error based on a difference between a delta range and a calculated range rate, and a range rate estimating unit which estimates a vehicle stop range rate based on position and velocity of GPS satellite based on transmission signal and a vehicle position, and modifies a calculated range rate, based on the built-in clock error. Further, the positioning device includes an own vehicle velocity calculating unit which calculates own vehicle velocities in three axial directions which form an orthogonal coordinate system, based on a navigation matrix, the vehicle stop range rate and the modified calculated range rate. | 05-21-2015 |
20150323676 | SYNCHRONIZATION USING MULTIPLE OFFSET GNSS RECEIVER CHANNELS - Systems and methods for synchronizing a global navigation satellite system (GNSS) receiver with a GNSS signal are provided. In one example, a GNSS receiver may include one or more sets of 20 GNSS channels that are each configured to integrate a received GNSS signal over a 20 millisecond accumulation window to output a navigation message bit. The accumulation windows of the 20 GNSS channels may be delayed relative to other windows of the 20 GNSS channels by 1 millisecond. The GNSS receiver may identify one of the 20 GNSS channels having the correct synchronization with the GNSS signal based on the navigation message bits output by the 20 GNSS channels. The identified GNSS channel having the correct synchronization with the GNSS signal may be used to determine a location of the GNSS receiver. | 11-12-2015 |
20150338522 | Positioning Using Non-Line-Of-Sight Signals - Systems, methods, and computer program products for determining a location from non-line-of-sight (NLOS) signals are described. An RF receiver can receive signals of an RF transmitter (e.g., a GNSS satellite) reflected by one or more building surfaces. A processor embedded in or coupled to the RF receiver can reduce the effects of multipath interference caused by the reflections using data on reflective characteristics of buildings located close to the RF receiver. The data can include information on which surfaces of the buildings are visible to the RF receiver. The processor can then estimate, from the visible surfaces and known satellite locations, feasible signal paths for a signal from a satellite to the RF receiver. The processor can then correct a location estimation by taking into account the multipath effects of the signal traveling along the feasible signal paths. | 11-26-2015 |
20150355339 | METHOD FOR ESTIMATING THE LEVEL OF ERROR IN SATELLITE GEOLOCATION MEASUREMENTS AND FOR MONITORING THE RELIABILITY OF SAID ESTIMATIONS AND ASSOCIATED DEVICE - In the field of satellite global navigation, a method is provided for estimating the level of error in global navigation satellite measurements and for ensuring the reliability of these estimations, implemented by a global navigation device in which local errors are detected by said global navigation device and errors associated with the satellites are detected by a ground segment. | 12-10-2015 |
20160146945 | POSITION DETECTION DEVICE, POSITION DETECTION SYSTEM, AND POSITION DETECTION METHOD - An object is to make it possible to determine and output an accurate current position reliably in a short time and at a low cost, even in environments where signals from positioning satellites are complicatedly affected by structures, geographical features, etc. Therefore, the present invention provides a position detection device comprising: a receiving unit receiving signals from a positioning satellite, and calculating a pseudo range to the positioning satellite based on the signals, and a positioning unit calculating an initial position based on the pseudo range calculated by the receiving unit, calculating the pseudo range to the positioning satellite at plural positions around the initial position using a three-dimensional map data and a ray-tracing method, selecting candidate positions from the plural positions based on the pseudo range, and deciding a current position based on the candidate positions within such a short distance from the initial position that predetermined conditions are satisfied. | 05-26-2016 |
20160161613 | SYSTEM AND METHOD FOR USING GNSS TRACKING CORRELATORS FOR TERRESTRIAL BEACONS - A receiver having a plurality of tracking channels for tracking received positioning signals. A pseudo random number (PRN) sequence is generated in each tracking channel. Each PRN sequence is offset from the PRN sequence generated by each other tracking channel to create a tracking window that can be extended and for which the sample rate can be set. | 06-09-2016 |
20160170026 | METHODS FOR IDENTIFYING WHETHER OR NOT A SATELLITE HAS A LINE OF SIGHT | 06-16-2016 |
20160170027 | ELECTRONIC RECEIVER WITH OPEN-LOOP CORRELATORS FOR MITIGATING THE MULTIPATH INTERFERENCE, AND METHOD FOR ESTIMATING AN ALIGNMENT ERROR | 06-16-2016 |
20160252620 | MULTIPATH MITIGATION IN POSITIONING SYSTEMS | 09-01-2016 |
20160252621 | GNSS BASE STATION ANTENNA SYSTEM WITH REDUCED SENSITIVITY TO REFLECTIONS FROM NEARBY OBJECTS | 09-01-2016 |
20180024249 | Device and a method for extracting timing information from a radio signal | 01-25-2018 |