Abstract: Methods and apparatuses are provided that may be implemented in various electronic devices to possibly reduce a first-time-to-fix and/or otherwise increase the performance or efficiency of a device in determining its current estimated position. In some embodiments, it may be determined whether current estimated position is valid based, at least in part, on pseudorange measurement information and pseudorange predicted information, and such determining may include obtaining a sum-of-squares of an a-posteriori measurement residual associated with the pseudorange measurement information and the pseudorange predicted information.

Abstract: A GPS, GLONASS or Galileo receiver for radio positioning signals wherein at least a part of the computing of position related data based on radio signals received from a plurality of space vehicles is carried out by a graphics or sound processor. The receiver thus makes use of available computing resources, thus achieving a lower bill of material.

Abstract: A method and apparatus for avoiding receiver interference is described herein. One or more potential interferers are determined and the frequency associated with the interferers is also determined A desired sampling frequency for the receiver is calculated to avoid the potential interferers.

Abstract: Methods and apparatus are provided for use in devices operatively enabled to perform waveform correlation result processing.

Abstract: Methods and apparatuses are provided for use in devices that are enabled to receive control channel information over a link having a plurality of interlaced slots. The methods and apparatuses may be implemented to selectively disable/enable one or more circuits within a receiver path at selected times.

Abstract: A dynamic position reporting and/or logging scheme is described herein. Position reporting and/or logging for a mobile device may be dynamically determined based on one or more reporting and/or logging constraints. The constraints may be based on time, distance, events, operating parameters, operating conditions, or some combination thereof. The constraints that dynamically trigger position reporting may be the same as, overlap, or be distinct from the constraints used to trigger position logging. The reporting and logging constraints can be selected to provide a more accurate indication of a track or route traveled by the mobile device.

Abstract: Different types of position fixes may be used to determine the location of a mobile station in a wireless communication system. The position fixes include terrestrial, or network, based techniques, and non-network based techniques, such as satellite, based techniques. An apparatus and method are presented by which different position fixes may be selected, based on the performance of a particular position fix in a particular mobile remote unit.

Abstract: An apparatus and method for tracking a desired signal by sequentially tracking the desired signal with a variable integration time, performing automatic frequency control of the desired signal, and demodulating the desired signal using offline software. In one aspect, the automatic frequency control is performed using the offline software. In one aspect, the desired signal is from a GPS satellite.

Abstract: An apparatus and method for tracking a target wherein a new position fix is taken when the measured movement of the target is more than a predetermined threshold amount or when the position fix has not been updated in a predetermined interval. The apparatus and method manage energy use and network resources when performing position determination fixes.

Abstract: A mobile station database of cellular identifications and associated position information is stored in mobile station memory. The mobile station uses the position information in the database to assist in determining a current position for the mobile based on an identifier, such as cell ID, base station BSIC, PSC, or carrier frequency. A satellite vehicle signal is searched in an uncertainty region that is a function of position information associated with the current identifier. The uncertainty region can be limited by assumed platform dynamics via predefined velocity and acceleration information. Time maintenance for the mobile station can also be achieved through known approximate position from the position database and measurement of a single satellite vehicle propagation delay. The mobile station can compare a position determination obtained through satellite vehicle signals with position database information to determine the validity of that position.

Abstract: A system and method in which the position update rate is adaptively modified, based on previous position measurements. By adjusting the update rate based on velocity predictions from two or more position fixes, a lower update rate may be used without exceeding the maximum error. Lowering the update rate reduces power consumption in the UE, providing longer battery operation. The updating method may comprise periodically repeating the velocity prediction and periodically adjusting the update rate responsive thereto. The update rate may be adjusted using additional information such as an acceleration prediction, a minimum update rate, or a preferred error. In some embodiments a model for user movement may be used to provide more accurate predictions, for example, stationary, walking, jogging, city driving, and freeway driving. The updating method may comprise receiving user input regarding the maximum position error.

Abstract: The subject matter disclosed herein relates to receiving one or more SPS signals at two or more physically separated antennae. In an aspect, signals from the physically separated antennae may be downconverted into complex digital signals that may undergo further processing to improve one or more performance metrics related to position estimation operations, for example.

Abstract: The invention consists of a barometric pressure sensor, coupled to a processor for recording changes in the pressure over time, this is coupled to a GPS device providing an accurate measurement of the altitude which allows for the barometric pressure measurements to be normalized, typically to mean sea level. Once the measurements have been normalized the effects of the vertical motion of the sensor are effectively removed and the resulting trend shows the absolute atmospheric pressure which can then be used for weather prediction.

Abstract: A method for measuring positional changes of an object, including rotation about any or all of three axes, using linear accelerometers. There is disclosed a method of using a linear accelerometer to integrate two other 3D linear accelerometers in order to measure and supply for further use six-dimensional information, that is, translation in three dimensions and rotation about three axes. Two linear accelerometer sensors are used to determine all but one of the variables in the six degrees of freedom. Output from a third accelerometer generates the data need to determine a sixth, rotational, degree of freedom. The need for a gyroscope for detecting changes in heading (i.e., yaw or azimuth) may therefore be avoided.

Abstract: A reference clock circuit (170), has a low-power mode, in which the frequency consumption is reduced, and including an internal counter, accumulating time spent in low-power mode. The circuit includes a crystal resonator (60), an oscillator circuit (70), and a temperature compensation circuit (80), providing a stable clock output (85). During low-power mode temperature compensation can be switched off. The circuit further provides a wakeup signal (107) after a preset time in low-power mode.

Abstract: Method and apparatus to implement a “virtual” real-time clock at a terminal based on time information from multiple communication systems. At least one system (e.g., GPS) provides “absolute” time information for the virtual real-time clock, and at least one other system (e.g., a cellular system) provides “relative” time information. The virtual real-time clock is “time-stamped” with absolute time as it becomes available from the first system. Relative time (which may be received from multiple asynchronous transmitters) is mapped to the timeline of the virtual real-time clock as it is received from the second system. Absolute time at any arbitrary time instant on the timeline may then be estimated based on the absolute time from the first system and the relative time from the second system. Absolute times from the first system for two or more time instants may also be used to calibrate the relative time from the second system.

Abstract: Different types of position solutions may be used to determine the position of a mobile station (104) in a wireless communication system (101). The position solutions include terrestrial, or network (102, 103), based techniques and non-network, such as satellite (160), based techniques. An apparatus and method whereby different position solutions are selected based on a figure of merit of the different solutions in determining a position of a mobile remote unit (104).

Abstract: Systems, methods and devices for signal processing are presented. In particular, methods for the detection of signals in CDMA-based systems are presented, together with corresponding devices. These methods provide more efficient use of correlation resources through proper identification of candidate signal peaks and may include performing at least one pre-detection stage and performing at least one distillation stage.

Abstract: Embodiments disclosed herein relate to methods and systems for providing improved position-location (e.g., time-of-arrival) measurement and enhanced position location in wireless communication systems. In an embodiment, an access point may replace information (e.g., data) transmission by a “known” transmission (or “reference transmission”) at a predetermined time known to access terminals in the corresponding sectors. The access terminals may use the received reference transmission to perform a position-location measurement, and report back the measured information. The access point may also send a reference transmission on demand, e.g., in response to a request from an access terminal in need for a location-based service.

Abstract: Frequency discriminator based on a variant of the DFT transform in which the usual twiddle factors are replaced with twiddle factors as for a DFT on a number of points which is the double as the actual number of sample points. The DFT so modified allows half-bin frequency discrimination, with few added computational burden. Two DFT shifted of half bin with respect to the zero frequency provide a linear response of the discrimination and good immunity to noise. The discriminator is particularly useful in FLL for tracking signals in a GPS receiver.