Class / Patent application number | Description | Number of patent applications / Date published |
342357620 | Testing, monitoring, correcting or calibrating of a receiver element (IPC) | 33 |
20110018762 | METHOD AND SYSTEM FOR CALIBRATING A LOCAL GNSS CLOCK USING NON-GNSS SYSTEM CLOCKS IN A GNSS ENABLED MOBILE DEVICE - A GNSS enabled mobile device is operable to receive two or more system clocks via from a plurality of associated non-GNSS communication networks, for example, GSM, GPRS, UMTS, EDGE, EGPRS, LTE, WiMAX, high-speed wireless LAN (WiFi), and/or short-range wireless (Bluetooth). The received system clocks are used to calibrate an local GNSS clock for the GNSS enabled mobile device. The GNSS enabled mobile device communicates the received system clocks with an associated GNSS receiver without using an external circuitry. The GNSS receiver selects a calibration clock from the received system clocks based on the status (active or inactive) of corresponding system clocks. An active system clock is selected as the calibration clock. The associated local GNSS clock is calibrated by removing clock errors from the associated local GNSS clock using the selected calibration clock. The calibrated local GNSS clock is used for detecting GNSS signals and/or processing detected GNSS signals. | 01-27-2011 |
20110018763 | Positioning apparatus, positioning method, and program product - A GPS receiver outputs pseudo distances each containing a clock bias error. A clock bias and a reception position are calculated based on each of the outputted pseudo distances. A clock drift is calculated based on clock biases at past n points or Doppler information outputted from the GPS receiver. Based on the calculated clock drift, a reference clock bias is estimated using a regression equation or a Kalman filter. Thereby, a position-fix accuracy is evaluated appropriately, without needing external data, such as autonomous navigation information. | 01-27-2011 |
20110156953 | METHOD AND SYSTEM FOR SHARING AN OSCILLATOR FOR PROCESSING CELLULAR RADIO SIGNALS AND GNSS RADIO DATA SIGNALS BY DEFERRING AFC CORRECTIONS - A global navigation satellite system (GNSS) enabled mobile device comprising a crystal oscillator and an automatic frequency correction (AFC) circuit may be operable to share the crystal oscillator between processing of cellular radio signals and processing of GNSS data messages. The GNSS enabled mobile device may be operable to enforce an AFC correction when the crystal oscillator drifts beyond a specific frequency error. The AFC correction may be allowed during time intervals corresponding to GNSS words at which decoding of these words is not required. The GNSS enabled mobile device may be operable to disable the AFC correction during time intervals associated with decoding of words while the crystal oscillator may drift within the specific frequency error range. After the decoding of one or more of words is completed, the AFC correction may be allowed during the time intervals corresponding to these words. | 06-30-2011 |
20110187595 | TRANSFER OF CALIBRATED TIME INFORMATION IN A MOBILE TERMINAL - A method of and system for calibrating un-calibrated time information within a mobile terminal | 08-04-2011 |
20110199261 | METHOD AND SYSTEM FOR STABILIZING A GNSS CLOCK BY REDUCING INTERFERENCE - Methods and systems for stabilizing a GNSS clock by reducing interference are disclosed and may include stabilizing a frequency of a temperature compensated crystal oscillator (TCXO) on a chip in a GNSS device. A clock signal may be generated for the device by temporarily configuring circuitry adjacent to the TCXO at a constant power level. Temperature and electromagnetic interference of the TCXO may be stabilized by the constant power level of the adjacent circuitry, which may be on the chip or external to the chip. The frequency of the TCXO may be stabilized by temporarily disabling the adjacent circuitry. A GNSS clock signal may be stabilized by the configuring of the constant power level while a GNSS location may be calibrated. A GNSS location of a fixed wireless device, such as a wireless access point, may be calibrated utilizing the configured constant power level and shared with other wireless devices. | 08-18-2011 |
20110279314 | GNSS Signal Processing Methods and Apparatus with Ionospheric Filters - Methods and apparatus are provided for processing a set of GNSS signal data derived from signals of a first set of satellites having at least three carriers and signals of a second set of satellites having two carriers. A geometry filter uses a geometry filter combination to obtain an array of geometry-filter ambiguity estimates for the geometry filter combination and associated statistical information. Ionosphere filters use a two-frequency ionospheric combination to obtain an array of ionosphere-filter ambiguity estimates for the two-frequency ionospheric combinations and associated statistical information. Each two-frequency ionospheric combination comprises a geometry-free two-frequency ionospheric residual carrier-phase combination of observations of a first frequency and observations of a second frequency. Auxiliary ionosphere filters use an auxiliary ionospheric combination to obtain an array of auxiliary-ionosphere-filter ambiguity estimates for the auxiliary ionospheric combinations and associated statistical information. Each auxiliary ionospheric combination uses carrier-phase observations of a third frequency and carrier-phase observations of at least one of the first frequency and the second frequency. A combined array of ambiguity estimates is prepared for all carrier phase observations and associated statistical information by combining the arrays of the geometry filter and the ionosphere filters and the auxiliary ionosphere filters. | 11-17-2011 |
20110285587 | GNSS Surveying Methods and Apparatus - Methods and apparatus are presented for improved productivity in determining static position of an antenna of a GNSS rover, such as in stop-and-go surveying. Computer-implemented methods and apparatus provide for determining a static position of an antenna of a GNSS rover from observations of GNSS signals collected at the antenna over multiple epochs and from correction data for at least one of the epochs. In some forms this comprises: acquiring first-epoch rover observations of GNSS signals received at the antenna during a first epoch, obtaining first-epoch correction data for the first epoch, determining a synchronized rover antenna position for the first epoch from the first-epoch rover observations and the first-epoch correction data, acquiring subsequent-epoch rover observations from the received GNSS satellite signals for at least one subsequent epoch for which correction data is unavailable, determining that the antenna position remained static for at least two static epochs, and determining an updated rover antenna position from the synchronized rover antenna position and the subsequent-epoch rover observations of at least one static epoch of the at least one subsequent epoch. | 11-24-2011 |
20110316738 | Adjusting a Bandwidth of GNSS Receivers - Embodiments of the invention provide a method of adjusting a bandwidth of receivers. A plurality of outputs from a correlator engine are combined. User dynamics are sensed. Bandwidth of one or more receivers are adjusted. By detecting when the user is stationary, the Doppler frequency estimation can be corrected or the SNR can be boosted more both of which lead to improved performance. The embodiments allow a receiver to process signals in when the signal level would otherwise be too low—for example indoors. The embodiments can improve performance when one or more satellites are temporarily blocked but one or more satellites are still being tracked. | 12-29-2011 |
20110316739 | DIGITAL BEAM-FORMING APPARATUS AND TECHNIQUE FOR A MULTI-BEAM GLOBAL POSITIONING SYSTEM (GPS) RECEIVER - An advanced multiple-beam GPS receiving system is achieved that is capable of simultaneously tracking multiple GPS satellites independently, detecting multiple interference signals individually, and suppressing directional gain in the antenna pattern of each beam in the interference directions. The GPS receiving system can be used for both planar and non-planar receiving arrays, including arrays that are conformally applied to the surface of a platform such as an aircraft. The GPS receiver combines spatial filtering and acquisition code correlation for enhanced rejection of interfering sources. Enhanced gain in the direction of GPS satellites and the ability to shape the beam patterns to suppress gain in the direction of interfering sources make the GPS receiving system largely insensitive to interfering and jamming signals that plague conventional GPS receivers. | 12-29-2011 |
20120169536 | GNSS RECEIVER DESIGN TESTING - A GNSS receiver design is tested, which design includes software for generating position/time related data (DPT) based on raw digital data (dRAW) when the software is executed in a processing unit of the receiver. GNSS signals (SRF) are received via a radio frequency input device while moving the radio frequency input device along a route trajectory. The received GNSS signals (SRF) are fed to a radio-frequency front end of a representative example of a receiver unit built according to the design to be tested. The radio-frequency front end produces raw digital data (dRAW) representing the received GNSS signals (SRF), and the raw digital data (dRAW) are stored in a primary data storage as a source file (Fsc). The source file (Fsc) is read from the primary data storage, and the source file (Fsc) is processed by means of the software to generate at least one set of position/time related data (DPT). Each set of position/time related data (DPT) is stored to a respective result file (Fres), and the result file(s) (Fres) is/are evaluated against reference data (Dref) to determine the performance of the design. | 07-05-2012 |
20120223858 | Method and System for Sharing an Oscillator for Processing Cellular Radio Signals and GNSS Radio Data Signals By Deferring AFC Corrections - A global navigation satellite system (GNSS) enabled mobile device comprising a crystal oscillator and an automatic frequency correction (AFC) circuit may be operable to share the crystal oscillator between processing of cellular radio signals and processing of GNSS data messages. The GNSS enabled mobile device may be operable to enforce an AFC correction when the crystal oscillator drifts beyond a specific frequency error. The AFC correction may be allowed during time intervals corresponding to GNSS words at which decoding of these words is not required. The GNSS enabled mobile device may be operable to disable the AFC correction during time intervals associated with decoding of words while the crystal oscillator may drift within the specific frequency error range. After the decoding of one or more of words is completed, the AFC correction may be allowed during the time intervals corresponding to these words. | 09-06-2012 |
20120242542 | INTER-CHANNEL BIAS CALIBRATION FOR NAVIGATION SATELLITE SYSTEMS - Dynamic inter-channel bias calibration of a navigational receiver is provided. A reference signal is propagated through front-end circuitry of the receiver. A delay caused by the propagation of the reference signal through the front-end circuitry is measured. The inter-channel bias of the navigational receiver is reduced using the measured delay associated with the front-end circuitry of the receiver. | 09-27-2012 |
20120286995 | SYSTEMS AND METHODS FOR CLOCK CORRECTION - A non-GPS satellite-based system enables correction of a local clock in a user device to facilitate GPS-based location determination. | 11-15-2012 |
20130027248 | METHODS AND APPARATUSES FOR USE WITH MODE-SWITCHABLE NAVIGATION - Methods and apparatuses are provided for use with mode switchable navigation radios and the like. The methods and apparatuses may be implemented to selectively switch between certain operating modes based, at least in part, a mode-switching test that takes into consideration one or more non-timed test conditions to determine if mode-switching may be enabled. | 01-31-2013 |
20130044027 | METHOD AND DEVICE FOR CALIBRATING A RECEIVER - The invention relates to a method for calibrating an antenna of a receiver of signals (s | 02-21-2013 |
20130063305 | FREQUENCY CALIBRATION METHOD AND SATELLITE POSITIONING SYSTEM UTILIZING THE METHOD - A frequency calibration method and a satellite positioning system utilizing the frequency calibration method are disclosed. The frequency calibration method includes the following steps: detecting a plurality of chip state parameters; and determining a frequency drift and a frequency variation of a target signal according to the detected chip state parameters. | 03-14-2013 |
20130099967 | CLOCK DRIFT PROFILE DETERMINATION IN NAVIGATION SYSTEM RECEIVERS - Navigation system receiver, and test circuits and methods for determining drift profile of a receiver clock in the navigation system receiver are disclosed. In an embodiment, the navigation system receiver includes a clock source configured to generate a receiver clock for the navigation system receiver and a test circuit. The test circuit is configured to facilitate determination of a drift profile associated with the receiver clock based on detection and tracking of a test signal received by the test circuit, where the test signal comprises at least one continuous wave (CW) signal. | 04-25-2013 |
20130106654 | Method for Calibrating an Active Antenna | 05-02-2013 |
20130127663 | APPARATUS AND METHOD FOR GENERATING SATELLITE NAVIGATION SIGNAL BASED ON SOFTWARE - Provided is an apparatus and method for generating a satellite navigation signal, the method including: extracting, navigation data that is a parameter required to generate a navigation message; verifying visible satellites at a current position of a receiver based on a position of the receiver and positions of satellites calculated based on navigation data; calculating a pseudo distance from each visible satellite and a Doppler of each visible satellite; calculating, as a Doppler period, a duration of time corresponding to a Doppler displacement capable of being processed at the receiver; generating a navigation message frame to generate a satellite navigation signal, based on navigation data and a TOW; and generating a satellite navigation signal of a digitized IF for each visible satellite based on the navigation message frame, the pseudo distance for each visible satellite, and the Doppler for each visible satellite during the Doppler period. | 05-23-2013 |
20130271317 | Methods and Apparatus for Testing Satellite Navigation System Receiver Performance - A test system for performing over the air testing on a device under test (DUT) with satellite navigation system capability is provided. The test system may include a test host, a satellite navigation system emulator, a test chamber in which the DUT may be placed during testing, and test antennas mounted inside the test chamber. The satellite navigation system emulator may receive ephemeris and almanac data and may generate corresponding simulated test signals to be transmitted to the DUT via the test antennas. The test antennas may be mounted on fixed or rotatable ring-shaped antenna mounting structures configured to emulate respective orbital planes in a given satellite constellation that is currently being characterized. The DUT may also be rotated during testing to emulate user movement. | 10-17-2013 |
20140070990 | COMMUNICATIONS DEVICE WITH OSCILLATOR CALIBRATION AND RELATED METHODS - A communications device includes a housing, an antenna carried by the housing, an oscillator carried by the housing to generate a reference signal, and an RF receiver carried by the housing, and coupled to the antenna and the oscillator, the RF receiver demodulating a received signal from the antenna based upon the reference signal. The communications device also includes a GPS receiver carried by the housing to generate a calibration signal, a temperature sensor carried by the housing to generate a sensed temperature value, and a processor carried by the housing and coupled to the oscillator, the RF receiver, the GPS receiver, and the temperature sensor. The processor may enter an oscillator calibration mode based upon the sensed temperature value for selectively calibrating the oscillator based upon the calibration signal. | 03-13-2014 |
20140232596 | ANTENNA ARRAY CALIBRATION - An apparatus for performing calibration of an antenna array having a plurality of antennas including at least a first antenna and a second antenna. The apparatus includes a global navigation satellite system receiver configured to measure a first phase of a first signal received by the first antenna from a satellite and a second phase of a second signal received by the second antenna from the satellite. The apparatus also includes at least one processor configured to receive the first phase and the second phase from the global navigation satellite system receiver and to operate in a calibration mode to determine a difference between the first and second phases. | 08-21-2014 |
20150097726 | DIGITAL REAL TIME CLOCK MONITOR FOR A GNSS RECEIVER AND SINGLE PIN SIGNALLING FOR POWER-ON RESET AND WAKE-UP INTERRUPT - Methods, systems, and devices for monitoring a Real Time Clock (RTC) oscillator using Digital Signal Processing (DSP), where a resistance/capacitance (RC) oscillator is configured to output a digital pulse signal and a digital RTC Monitor Integrated Circuit (IC) is configured to monitor the RTC oscillator timing signal using the RC oscillator signal. In one aspect, the RTC Monitor IC includes an RTC input configured to receive the RTC oscillator timing signal; an RC input configured to receive the RC oscillator digital pulse signal; and an RTC reset output configured to output an RTC reset signal when a comparison of the RTC and RC oscillator inputs show the RTC oscillator has missed one or more clock cycles. A single wire input/output for both reset and interrupt signals between circuits is also described. | 04-09-2015 |
20150301185 | METHOD AND APPARATUS FOR MEASURING SYNTHETIC RECEPTION PATTERN OF ADAPTIVE ARRAY ANTENNA - A method and apparatus for measuring the synthetic reception pattern of an adaptive array antenna, which are divided into a hardware apparatus and a measurement method. The hardware apparatus includes a wavefront simulator, a GNSS simulator, an external controller, a signal measurement unit, and a GNSS receiver. The measurement method using the hardware apparatus includes setting a direction of arrival of jamming and calculating a weight vector, fixing weight vectors at the calculated weight vector and collecting outputs of an array antenna system for all test signals, and displaying the collected data on a grid of a 2D plane. In accordance with the present invention, a weight vector calculated under a specific jamming situation is maintained for all test signals, so that the synthetic reception pattern of the array antenna system can be measured. | 10-22-2015 |
20150355338 | MEASURING SYSTEM AND MEASURING METHOD FOR MODEL BASED GENERATION OF GLOBAL NAVIGATION SATELLITE SYSTEM SIGNALS - 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. | 12-10-2015 |
20160025859 | FAST ESTIMATION OF UTC TIME IN A MOBILE DEVICE USING GNSS - A method is described for estimating the coordinated universal time (UTC). The method involves receiving, by a satellite navigation receiver, signals broadcast by a global navigation satellite service (GNSS) satellite. The signals encode a first time of week (TOW) value. The method also involves estimating a first week number (WN) value and a first relationship between the UCT and a reference time of an onboard clock of the GNSS satellite (OFFSET) from time parameter values stored at a local memory. The method determines a first estimate of the UTC from the first TOW value, the first WN value, and the first OFFSET. | 01-28-2016 |
20160109579 | DEVICE AND METHOD FOR COMPUTING AN ERROR BOUND OF A KALMAN FILTER BASED GNSS POSITION SOLUTION - The invention relates to a method for computing a bound B up to a given confidence level 1-4, of an error in a state vector estimation KSV of a state vector TSV of a physical system as provided by a Kalman filter. The method decomposes the errors of the Kalman solution as a sum of the errors due to each of the measurement types used in the filter, In addition, the contribution of each type of measurement is bounded by a multivariate t-distribution that considers the error terms from all the epochs processed. Then, the method implements three main operations:
| 04-21-2016 |
20160109580 | METHOD AND SYSTEM FOR CALIBRATING GROUP DELAY ERRORS IN A COMBINED GPS AND GLONASS RECEIVER - A combined GPS and GLONASS receiver receives GPS signals and GLONASS signals. A calibration signal is generated utilizing the received GPS signals and/or the received GLONASS signals to offset group delay errors in the received GLONASS signals. The generated calibration signal is filtered through Kalman filters to estimate group delay variations in the received GLONASS signals. The estimated group error delay variations are combined with the received GLONASS signals to calibrate the received GLONASS signals by offsetting the estimated group error delay variations. When GPS signals are not available for use, the combined GPS and GLONASS receiver obtains group delay errors stored or in the received GLONASS signals to estimate calibration coefficients. The estimate calibration coefficients are updated utilizing received GPS and/or GLONASS signals. The updated estimated calibration coefficients are stored before turning off the combined GPS and GLONASS receiver to expedite calibrating of GLONASS signals received upon turning on. | 04-21-2016 |
20160116598 | TIMING CIRCUIT CALIBRATION - Disclosed are devices, systems and techniques for propagating a system time maintained at a mobile device in a lower power mode using a sleep counter advanced by an XO crystal oscillator. In one particular implementation, a mobile device obtains initial and subsequent satellite positioning system fixes while in a higher power mode. Between the initial and subsequent position fixes, the mobile device may transition to a lower power mode during which measurements of a temperature of the XO crystal oscillator may be obtained. | 04-28-2016 |
20160170028 | Processing GPS Drifting | 06-16-2016 |
20160195618 | SYSTEMS AND METHODS FOR AUTOMATICALLY RE-RANGING A SATELLITE TERMINAL | 07-07-2016 |
20160377728 | SYSTEM AND A METHOD FOR DETERMINING AN IMAGE REJECTION CHARACTERISTIC OF A RECEIVER WITHIN A TRANSCEIVER - A method for determining an image rejection characteristic of a receiver within a transceiver is provided. The transceiver uses a common local oscillator. The method includes generating a test signal having a spectral peak and generating a local oscillator signal comprising a frequency with an offset from a center frequency of the spectral peak. Further, the method includes down-mixing the test signal in the receiver using the local oscillator signal to generate a down-mixed signal. The method further includes calculating a first value of a signal characteristic of the down-mixed signal in a first frequency range corresponding to a desired signal component of the down-mixed signal and calculating a second value of the signal characteristic of the down-mixed signal in a second frequency range corresponding to an undesired signal component of the down-mixed signal. Further, the method includes comparing the first value and the second value to generate the image rejection characteristic. | 12-29-2016 |
20180024250 | SATELLITE SIGNAL RECEPTION CHARACTERISTIC ESTIMATION APPARATUS, METHOD THEREOF, AND PROGRAM THEREOF | 01-25-2018 |