Abstract: A vector magnetometer comprising a cell filled with an atomic gas subjected to an ambient magnetic field, an optical pumping source capable of emitting a pump beam tuned to a pumping wavelength towards the cell and a parametric resonance detection device receiving a probe beam that has passed through the cell, the probe beam being identical to or different from the pump beam. The magnetometer also comprises a polarisation device configured so as to simultaneously or alternately confer linear polarisation and circular polarisation to the pump beam emitted towards the cell. And the detection device comprises an optical set up configured to separate, from the probe beam that has passed through the cell, optical signals carrying respectively information about an alignment state of the atoms from information about an orientation state of the atoms.

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry generates positional information related to a positional relationship between a transmitter coil and a receiver coil based on a magnetic resonance signal received from a subject. The processing circuitry adjusts an irradiation intensity of an RF pulse to be irradiated on the subject in accordance with the positional information.

Abstract: Various approaches of adjusting a gain of received signals in integrated circuitry include implementing an open-loop source-degenerated amplifier having a pair of input devices for amplifying the received signals; boosting an effective transconductance of the input devices (e.g., using a pair of super-gm feedback loops); and setting a bias current of devices in the open-loop source-degenerated amplifier (e.g., using a constant-gm bias circuit).

Abstract: Apparatus or system for homogenizing or modifying the magnetic fields of magnets, particularly the magnetic fields employed in nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) applications. The apparatus features passive structures for making magnetic field homogenizations or modifications, and specifically permits the production of desirable correction fields in which the correction field strength has a continuously adjustable value of field strength. Passive shim structures are provided and manipulated so to create correction fields that can have a continuously adjusted value of field strength, such that errors in the original field can be corrected with high fidelity. The passive structures may be physically modified or adjusted by rotation so that truly continuous adjustment of strength and orientation of the corrective fields may be achieved.

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry configured to generate a plurality of reference partial k-space data items based on the filling positions and reference k-space data, generate a plurality of difference k-space data items by taking differences between the partial k-space data items and the reference k-space data items to each of the frames, generate a plurality of difference images by applying the reconstruction processing respectively to the difference k-space data items, and generate a plurality of composite images by combining the reference image with each of the difference images.

Abstract: A system and method for magnetic resonance imaging reconstruction using novel k-space sampling sequences is provided. The method includes dividing k-space into a plurality of regions along a dividing direction; scanning an object using a plurality of sampling sequences; acquiring a plurality of groups of data lines; filling the plurality of groups of data lines into the plurality of regions of the k-space; and reconstructing an image based on the filled k-space.

Abstract: Disclosed is a system and method for estimating quantitative parameters of a subject using a magnetic resonance (“MR”) system using a dictionary. The dictionary may include a plurality of signal templates that sparsely sample acquisition parameters used when acquiring data. The acquired data is compared with the dictionary using a neural network. Thus, systems and methods are provided that are more computationally efficient, and have reduced data storage requirements than traditional MRF reconstruction systems and methods.

Abstract: In general, according to the present embodiment, a magnetic resonance imaging apparatus includes sequence control circuitry and processing circuitry. The sequence control circuitry collects MR data corresponding to each of a plurality of echo times. The processing circuitry generates a plurality of magnitude images corresponding to the plurality of echo times based on the MR data. The processing circuitry generates a relaxation time map of tissue based on the plurality of magnitude images. The processing circuitry generates a susceptibility map quantitatively indicating susceptibility values in a subject based on a magnetic field distribution that is generated based on a plurality of phase images corresponding to the plurality of echo times and the relaxation time map.

Abstract: A system and method are provided for controlling a magnetic resonance imaging system to perform a gradient echo pulse sequence that includes varying a phase of an RF pulse of the gradient echo pulse sequence between repetitions and acquire complex MR data. The method includes processing the complex MR data to determine signal contributions from transverse relaxation (T2) in the subject, generating a quantitative T2 map of the subject using the signal contributions from T2 in the subject, and displaying the quantitative T2 map.

Abstract: A system and method for controlling a magnetic resonance imaging (MRI) system to create magnetic resonance (MR) angiograms of a subject. The method includes controlling the MRI system to acquire MR data by performing a pulse sequence that includes at least one set of modules formed by a first ?/2 module, a (readout, ?)n module, a second ?/2 module. In this case, ? denotes a radiofrequency (RF) flip angle and n denotes a number of times that the set of modules is repeated. The method also includes reconstructing an MR angiogram of the subject from the MR data.

Abstract: A magnetic resonance imaging device includes a control unit configured to set a plurality of frequency bands within a predetermined frequency range. A subject is caused to be irradiated with a high-frequency magnetic field pulse having one of the frequency bands from a transmission unit. A reception unit is caused to receive a nuclear magnetic resonance (NMR) signal generated by the subject. An image generation unit is caused to generate an image from the NMR signal while changing the frequency band. A plurality of images corresponding to the plurality of frequency bands are obtained, and a composite of the plurality of images is obtained. The frequency bands are set so that adjacent frequency bands partially overlap each other. A bandwidth of the frequency bands is narrowest for the frequency band including a specific frequency within the frequency range, and widens in a direction away from the specific frequency.

Abstract: The present application discloses methods and apparatus for measuring the arbitrary magnetic response of many individual magnetic particles at once, using a plurality of magnetic images of the magnetic particles acquired over a range of magnetic conditions.

Abstract: A device includes a first biosensor of a biosensor array; a second biosensor of a biosensor array; a readout circuit electrically connected to the biosensor array; a decoder electrically connected to the biosensor array; a voltage generator electrically connected to the biosensor array; and a decision system electrically connected to the voltage generator and the readout circuit.

Abstract: A communications system, including at least one tag and a plurality of beacons. The tags are configured to detect beacon advertisement messages, initiate a connection with at least one of the plurality of and transmit a Constant Tone (CT) to the at least one of the plurality of beacons. The tag is further configured to determine a location thereof based on the sampled CT from both the beacon and the tag and then report the location via the one of the beacons and/or an access point. Phase ranging mitigation techniques which include hop duplication, hop interpolation and ADC DC offset correction are employed so as to provide more accurate ranging values even in the case where there are many other devices in local proximity and which are competing for use of the same RF channels as those used by the tags and beacons.

Abstract: Hybrid positioning methods and electronic apparatuses are provided. A representative method includes: obtaining initial location information; computing initial moving information based upon the sensor readings; computing estimated location information based on the initial moving information and the initial location information; acquiring geographical location readings if a location update condition is satisfied; generating reference location information based on the geographical location readings acquired; comparing the estimated location information with the reference location information to obtain a deviation information; computing a calibrated moving information based on the estimated location information and the deviation information; and computing a calibrated location information based on the deviation information, calibrated moving information and the estimated location information.

Abstract: A split architecture is disclosed for determining the location of a wireless device in a heterogeneous wireless communications environment. A detector within the device or another component of the environment receives signals including parameters for a localization signal of the device. The parameters describe known in advance signals within the signals. Additional metadata including each frame start of the signals and assistance data and auxiliary information are also received. The known in advance signals are detected based on the parameters of the localization signal. Samples extracted from the known in advance signals are then processed and compressed and sent with other collect data to a locate server remote from the detector. The location server uses that information as well as similar information about the environment to calculate the location of the device, as well as perform tracking and navigation of the device, and report such results to the environment.

Abstract: An apparatus obtains results of measurements, which are performed by a mobile device on signals of communication nodes. The measurement results for each of the communication nodes include a signal strength related value and an identification of the communication node. The apparatus obtains for one of the communication nodes a stored indication of a location and a stored signal strength related value and determines a difference between measured and stored signal strength related values. The apparatus estimates the position of the mobile device based on the results of measurements and on obtained stored radio model data. In the case that the determined difference for the at least one communication node falls short of a predetermined threshold, the apparatus determines a distance between estimated position and indicated location for the at least one communication node, as an indication of a health state of stored radio model data.

Abstract: An event detection system for a vehicle includes a transmitter and a receiver. The transmitter is disposed at a first position adjacent to a boundary of a space provided in the vehicle, including a first antenna having a transmitting direction, and the receiver is disposed at a second position adjacent to the boundary, which communicates with the transmitter and includes a second antenna having a receiving direction. The transmitter sends a probe signal toward the transmitting direction, and the receiver receives the probe signal. The receiver stores preset CSI. The preset CSI includes a first CSI and a normal CSI, the receiver obtains a current CSI from the probe signal by performing a time-reversal process, and to compare the current CSI to the preset CSI. When the first CSI is matched to the current CSI, a first event associated with the vehicle is determined to be occurred.

Abstract: Results of measurements by a mobile device on radio signals transmitted by at least one transmitter are obtained. The results of measurements comprise characteristics of the radio signals at each of a plurality of locations of measurements at a particular site, and indications of the locations of measurement. The results of measurement and the indications of the locations are provided and used as a basis for a generation of a radio map for use in supporting a positioning of mobile devices at the site. In addition, a user input to the mobile device is detected, the user input defining a localization area at the site that is to be covered by the radio map. A representation of the defined localization area is provided in addition for use in connection with the radio map.

Abstract: An apparatus is configured to perform a method for collaborative localization of multiple devices in a geographic area including receiving global localization data originating with one or more neighboring devices, receiving local localization data originating with a mobile device, determining a first confidence level from the local localization data, determining a second confidence level from the global localization data, and performing, by a processor, a collaborative localization calculation for the mobile device based on the first confidence level and the second confidence level.

Abstract: Disclosed, among other things is a wide area direction finding system comprising multiple radio frequency (RF) receiving units and a display computer. The RF receiving units may be in different geographic areas to make use of triangulation to precisely locate a target, allowing for increased area coverage and accuracy when locating a target. Locating a target may draw from real-time information using a “live mode,” or from a past event using a “history mode” on the display computer.

Abstract: A detector (110) for determining a position of at least one object (118) is disclosed. The detector (110) comprises: at least one optical sensor (112), the optical sensor (112) being adapted to detect a light beam (150) traveling from the object (118) towards the detector (110), the optical sensor (112) having at least one matrix (152) of pixels (154); and at least one evaluation device (126), the evaluation device (126) being adapted to determine a number N of pixels (154) of the optical sensor (112) which are illuminated by the light beam (150), the evaluation device (126) further being adapted to determine at least one longitudinal coordinate of the object (118) by using the number N of pixels (154) which are illuminated by the light beam (150).

Abstract: Signal measurement units each measure a signal output from a sound source, as a measured signal. Reference signal acquisition units each acquire a reference signal. A weighting processing unit creates weighted reference signals by weighting the reference signals. A time synchronization correction calculation unit calculates a time synchronization correction value based on the weighted reference signals. The time synchronization correction value is a correction value for synchronizing the two measured signals. An arrival time difference calculation unit calculates an arrival time difference based on the time synchronization correction value. The arrival time difference is a difference between elapsed times for the two measured signals acquired by respective ones of the pair of signal measurement units to arrive at the respective ones of the pair of signal measurement units. A sound source position calculation unit calculates a position of the sound source based on the arrival time difference.

Abstract: Embodiments of the present invention implement a novel methodology for processing radar image data from a radar system having one or more transmitter and receiver antenna pairs. The novel methodology deliberately operates on spectrally-notched radar data. It uses a specially-adapted version of the CLEAN algorithm to mitigate the effects of frequency-band notching. Following that, it performs a non-linear sidelobe-reduction algorithm to further eliminate artifacts and produce radar imagery of much higher quality. In some cases, it exploits a specific version of the recursive sidelobe minimization (RSM) algorithm which operates in the frequency and aperture (spatial) domain.

Abstract: A vehicular radar sensing system includes a radar sensor disposed at a vehicle. The radar sensor includes a plurality of antennas, which includes a plurality of transmitting antennas and a plurality of receiving antennas. The radar sensor transmits multiple outputs via the plurality of transmitting antennas and receives multiple inputs via the plurality of receiving antennas. The plurality of antennas includes a plurality of sets of antennas, each set having a V shape or an X shape, and with each of the shaped sets of antennas having an apex. A signal feed is provided to the apex of each of the shaped sets of antennas. Outputs of the receiving antennas are communicated to a processor, and the processor, responsive to the outputs of the receiving antennas, determines presence of one or more objects exterior the vehicle and within the field of sensing of the radar sensor.

Abstract: Methods, apparatus and systems for wireless object scanning are described. In one example, a described wireless scanning system comprises: a transmitter, a receiver, and a processor. The transmitter is configured for transmitting a first wireless signal using a plurality of transmit antennas towards an object in a venue through a wireless multipath channel of the venue. The receiver is configured for: receiving a second wireless signal using a plurality of receive antennas through the wireless multipath channel between the transmitter and the receiver. The second wireless signal differs from the first wireless signal due to the wireless multipath channel and a modulation of the first wireless signal by the object. The processor is configured for obtaining a set of channel information (CI) of the wireless multipath channel based on the second wireless signal received by the receiver, and generating an imaging of the object based on the set of CI.

Abstract: A LIDAR sensor including an optical receiver and an optical filter situated in the beam path upstream from the receiver. The filter is formed by connecting a transmission filter and a reflection filter in series.

Abstract: An assembly includes a housing having a chamber. A pressure source is in fluid communication with the chamber. A first sensor window and a second sensor window are each defined by the housing. The housing has a first port and a second port each in fluid communication with the chamber. The first port is adjacent the first sensor window, and the second port is adjacent the second sensor window.

Abstract: A scanning lidar system includes a first lens having a first lens center and characterized by a first optical axis and a first surface of best focus, a second lens having a second lens center and characterized by a second optical axis, a platform separated from the first lens and the second lens along the first optical axis, and an array of laser sources mounted on the platform. Each laser source of the array of laser sources has an emission surface lying substantially at the first surface of best focus of the first lens and positioned at a respective laser position. The scanning lidar system further includes an array of photodetectors mounted on the platform. Each photodetector of the array of photodetectors is positioned at a respective photodetector position that is optically conjugate with a respective laser position of a corresponding laser source.

Abstract: The invention relates to a method and a device for determining a return time of a returning light pulse by a Single Photon (SPL) LiDAR scanner, the SPL scanner comprising of a low photon count detector for converting low amounts of photons or single photons to electrical signals, and a control and processing unit for processing the data and for determining the return time of the returning light pulse. The control and processing unit identify detected photons potentially representing a return pulse event and create a return pulse signal based on a criterion involving a temporal probability distribution for the detected photons, identify a rising edge and a falling edge of the return pulse signal, and determine the return time for each return pulse event based on the rising edge and the falling edge of the return pulse signal.

Abstract: A frequency modulated (coherent) laser detection and ranging system includes a read-out integrated circuit formed with a two-dimensional array of detector elements each including a photosensitive region receiving both return light reflected from a target and light from a local oscillator, and local processing circuitry sampling the output of the photosensitive region four times during each sample period clock cycle to obtain quadrature components. A data bus coupled to one or more outputs of each of the detector elements receives the quadrature components from each of the detector elements for each sample period and serializes the received quadrature components. A processor coupled to the data bus receives the serialized quadrature components and determines an amplitude and a phase for at least one interfering frequency corresponding to interference between the return light and the local oscillator light using the quadrature components.

Abstract: Devices and methods are described that provide for scanning surfaces and generating 3-dimensional point clouds that describe the depth of the measured surface at each point. In general, the devices and methods utilize. Specifically, the depth mapping devices and methods utilize multiple receiver channels, with each receiver channel configured to have a different effective sensing range. These multiple receiver channels together provide the depth mapping device with an increased overall effective sensing range. Thus, the depth mapping device can effectively map surfaces that are closer and/or farther than could be mapped using only one receiver channel.

Abstract: Described herein are methods and systems for protecting a light detection and ranging (LIDAR) device against external light that is originated at a light source other than a light source of the LIDAR device and that is being emitted towards the LIDAR device. In particular, the LIDAR device may be equipped with a mitigation system that includes an interference filter, an absorptive filter, an adaptive filter, and/or a spatial filter. Additionally or alternatively, the LIDAR device may be operated to carry out reactive and/or proactive mitigation operations. For example, the LIDAR device may be operated to vary over time characteristics with which light is being emitted and to only detect light having characteristics that match the characteristics with which light is being emitted. In another example, the LIDAR device may be operated to activate a shutter to block the external light from being detected by the LIDAR device.

Abstract: Computer-implemented methods and systems for at least partially removing extrinsic static noise from data obtained by an optical time-of-flight sensor using full-waveform analysis. The method comprises finding a mathematical representation of the electromagnetic crosstalk present in victim calibration traces and caused by aggressor photosensitive element using aggressor calibration traces and victim calibration traces, determining a predetermined threshold for the amplitude of the aggressor calibration trace at which the electromagnetic crosstalk is present in the victim calibration traces, predicting the extrinsic static noise generated by the aggressor signal on the synchronized victim operation trace using the mathematical representation to generate a predicted crosstalk signal, removing the predicted crosstalk signal from the synchronized victim operation trace to output a denoised signal.

Abstract: A multi-line Lidar includes: a multi-line ranging laser emission module comprising one or more lasers; a multi-line ranging laser reception module comprising one or more photodetectors and adapted to detect a laser echo generated when a measurement laser emitted by the laser emission module is incident to an obstacle and is diffusedly reflected; a ranging information resolution module in electrical signal connection with the multi-line ranging laser emission module and the multi-line ranging laser reception module, and designed to calculate the distance, in each direction, to the obstacle by means of calculating the time difference between the emission of the measurement laser and the receiving of the laser echo; and a control circuit and an optical system correspondingly configured for the multi-line ranging laser emission module and the multi-line ranging laser reception module.

Abstract: Ultrasound signal processing device including: transmitter performing transmission events while varying a focal point; receiver generating, for each transmission event, receive signal sequences for transducer elements; delay-and-sum calculator generating, for each transmission event, a sub-frame acoustic line signal including an acoustic line signal for each measurement point located on target lines passing through the focal point and composing a target line group; and synthesizer combining sub-frame acoustic line signals to generate a frame acoustic line signal. The target lines are straight lines, and any measurement point, on any target line, that is spaced away from the focal point by a predetermined distance or more satisfies a condition that distance between the measurement point and a most nearby measurement point on the same target line is smaller than distance between the measurement point and a most nearby one among measurement points on an adjacent target line.

Abstract: A platform operates in an environment with other platforms using active sensing. The platform includes an active sensing system configured to provide a point cloud associated with the environment. The point cloud is used to navigate the platform. The active sensing system includes a transmitter configured to provide pulses of electromagnetic energy in a light band or a radar band or sonic energy and a receiver configured to receive returns associated with the pulses striking one or more targets in the environment. The transmitter is configured to impose a code onto the pulses, and the receiver is configured to detect the code to determine when the pulses of light where transmitted or to determine a source of the pulses.

Abstract: A method of measuring an azimuth of a target by a scanning radar includes (a) establishing a radar scanning model, including (a1) selecting an antenna pattern, (a2) setting a set of radar parameters, (a3) creating reflected signals simulation curve, (a4) sampling the reflected signals simulation curve to create a plurality of sets of simulation data, each set is consisted of successive samples, and (a5) normalizing each sample of each set of simulation data to create a plurality sets of records of normalized simulation data; (b) obtaining normalized scanning data; (c) comparing records of normalized simulation data with the normalized scanning data; and (d) obtaining an azimuth of the target.

Abstract: A radar system includes a split-block assembly unit comprising a first portion and second portion, where the first portion and the second portion form a seam. The radar system further includes a plurality of ports located on a bottom side of the second portion opposite the seam. Additionally, the radar system includes a plurality of radiating elements located on a top side of the first portion opposite the seam. The plurality of radiating elements is arranged in a plurality of arrays. The plurality of arrays includes a set of multiple-input multiple-output (MIMO) transmission arrays, a set of synthetic aperture radar (SAR) transmission arrays, and at least one reception array. Further, the radar system includes a set of waveguides configured to couple each array to a port.

Abstract: Techniques and apparatuses are described that enable power management using a low-power radar. The described techniques enable a radar system to reduce overall power consumption, thereby facilitating incorporation and utilization of the radar system within power-limited devices. In one aspect, the radar system can replace other power-hungry sensors and provide improved performance in the presence of different environmental conditions, such as low lighting, motion, or overlapping targets. In another aspect, the radar system can cause other components within the electronic device to switch to an off-state based on detected activity in an external environment. By actively switching the components between an on-state or the off-state, the radar system enables the computing device to respond to changes in the external environment without the use of an automatic shut-off timer or a physical touch or verbal command from a user.

Abstract: The present application generally relates to a method and apparatus for application trailering in a motor vehicle. In particular, the system is operative to determine a trailer type and handling characteristic of a trailer in response to a micro-Doppler signature of the trailer.

Abstract: A method for detecting presence of a person includes emitting, by a speaker of a device, a plurality of ultrasonic ping signals, receiving, by a microphone of the device, a plurality of reflected ultrasonic ping signals, and processing the received reflected signals to determine a presence of a person within a predetermined distance of the device. The processing includes determining changes in the reflected signals relative to the emitted signals by generating an impulse response by cross-correlating the received signals and the emitted signals, averaging the cross-correlated impulse response over a set time period, and generating a detection signal by subtracting the averaged cross-correlated impulse response from an instantaneous impulse response, applying a time gating function to select a portion of the detection signal corresponding to the reflected signal from the predetermined distance from the device, and applying gain compensation to the time gated detection signal to compensate signal falloff.

Abstract: In one embodiment, a lidar system includes a light source configured to emit an optical signal. The light source includes a seed laser diode configured to produce a seed optical signal and a semiconductor optical amplifier (SOA) configured to amplify the seed optical signal to produce an amplified seed optical signal, where the emitted optical signal includes the amplified seed optical signal. The lidar system also includes a scanner configured to direct the emitted optical signal into a field of regard of the lidar system and a receiver configured to detect a portion of the emitted optical signal scattered by a target located a distance from the lidar system. The lidar system further includes a processor configured to determine the distance from the lidar system to the target.

Abstract: A scanning optical range finder in a mobile robot includes an optical emitter circuit, a non-imaging optical element, an optical detector circuit, and a ranging circuit. The non-imaging optical element is arranged to receive optical signals at an entrance aperture thereof responsive to operation of the optical emitter circuit, and to direct the optical signals to an output aperture thereof. The optical detector circuit is configured to receive the optical signals from the output aperture of the non-imaging optical element, and to generate detection signals based on respective phase differences of the optical signals relative to corresponding outputs of the optical emitter circuit. The ranging circuit is configured to calculate a range of a target from the phase differences indicated by the detection signals. Related devices and methods of operation are also discussed.

Abstract: A LIDAR sensor for detecting an object in the surroundings, and to a method for activating a LIDAR sensor, the LIDAR sensor including at least one transmitting unit for emitting electromagnetic radiation, at least one receiving unit for receiving electromagnetic radiation which was reflected by the object, at least one refractive element, which is at least partially pervious to the electromagnetic radiation, and a rotating unit, which includes at least the at least one refractive element, the at least one transmitting unit and the at least one receiving unit. The core of the invention is that the at least one refractive element includes at least one optical lens and a beam splitter for splitting the electromagnetic radiation, two focal planes being present. The at least one transmitting unit and the at least one receiving unit are positioned in at least one focal plane of at least one refractive element.

Abstract: A method for reading a demodulation pixel of a distance sensor for determining a distance, in particular for determining the difference between two charge quantities independently of the total magnitude of the charge quantities, and also a distance sensor are proposed. For faster signal processing, provision is made for applying a variable control voltage to the transfer gates for influencing the potential wall, and lowering the respective potential walls of the corresponding transfer gates, before and/or until from the storage gates in each case charge carriers can surmount the respective potential wall of the corresponding transfer gate and pass to the assigned floating diffusion.

Abstract: Enabling colorization and color adjustments on 3D point clouds, which are projected onto a 2D view with an equirectangular projection. A user may color regions on the 2D view and preview the changes immediately in a 3D view of the point cloud. Embodiments render the color of each point in the point cloud by testing whether the 2D projection of the point is inside the colored region. Applications may include generation of a color 3D virtual reality environment using point clouds and color-adjusted imagery.

Abstract: Disclosed are a method and apparatus for generating information. A method may include: acquiring a visiting data sequence and a positioning data sequence of a user, visiting data including visiting time and a point of interest identifier, and positioning data including positioning time and location information; using, in response to determining that the visiting time of the visiting data in the visiting data sequence matches the positioning time of the positioning data in the positioning data sequence, the visiting data corresponding to the matched visiting time as target visiting data, and the positioning data corresponding to the matched positioning time as target positioning data; determining an effective area of a target point of interest; and determining a dwell time of the user at the target point of interest based on the effective area and the positioning data sequence.

Abstract: A method of processing a satellite signal includes: receiving a satellite positioning system (SPS) signal, including an SPS data signal of unknown data content, from a satellite at a wireless communication device; receiving symbol indications, of determined symbol values, from a terrestrial wireless communication system at the wireless communication device; correlating the SPS data signal with a pseudo-random noise code to obtain first correlation results; and using the symbol indications and the first correlation results to determine a measurement of the SPS signal.

Abstract: A location system acquires a first set of Global Navigation Satellite System (GNSS) satellites from a first set of raw GNSS signal data received by a GNSS receiver, using all of the coarse acquisition (C/A) codes for the system of GNSS satellites, to determine a first set of GNSS satellites to use for location processing. At a later time, the location system determines respective sets of GNSS satellites as subsets of successive sets of previously determined sets of GNSS satellites. When the number of identified satellites is less than a threshold, the location system again acquires a set of GNSS satellites from raw data using all of the C/A codes for the system of GNSS satellites.