Abstract: A satellite signal navigation receiver can reduce channel resource usage and matched filter requirements by producing a single-bit local replica code from the combined incoming signals of each in view satellite. In one embodiment, the E1-B and E1-C signals from a Galileo satellite are received and converted into single-bit digital representations (B and C, respectively). A modified local replica code D is created by modifying (B?C) by replacing all “?2” values with “?1” values, by replacing all “+2” values with “+1” values, and by replacing all zero values such that a sum of the replaced zero values over a predetermined period will approximately equal zero. For instance, the “0” values can be replaced with alternating “?1” and “+1” values. Another modified replica code D* can be created by modifying (B+C) in a similar manner.

Abstract: An object locator system for locating an object of interest in a scene. The locator system includes: a) a body mounted pedestrian localization unit worn by an operator; b) a hand-held rangefinder configured to be grasped by the operator; c) a pose sensor for estimating relative position and orientation of the hand-held rangefinder relative to the localization device; and d) a computer control system coupled to the pedestrian localization unit, the rangefinder, and the pose sensor, the computer control system being programmed to compute a relative location of the object with respect to the body worn localization unit using range data from the rangefinder and relative pose from the pose sensor, and transform the relative location to a global location using data from the pedestrian localization unit.

Abstract: A receive-only smart antenna with a directional-point command capability for communication with geostationary satellites, allowing autonomous detection of received signals in order to allow steerage of multiple beams. An array feed is used to illuminate a parabolic reflector, with each feed element of the smart antenna associated with a unique beam-pointing direction. As the receiver switches to different feed elements, the far-field beam is scanned, making it possible to track a geostationary satellite in slightly inclined orbits, eliminating the need for mechanical tracking mechanisms while maintaining high antenna gain in the direction of the satellite. The receive-only smart antenna also features capabilities for forming multiple simultaneous beams supporting operations of multiple geo-satellites closely space in slightly inclined orbits. The designs can support orthogonal beams for enhanced bandwidth capacity via multiple beams with excellent spatial isolation.

Abstract: An array of elements suitable for adaptive processing in an extreme jammed environment comprised of a plurality of smaller sub-arrays of element clusters that have natural orthogonal spatial modes of excitation, wherein the improvement comprises sub-arrays with spatial orthogonality of feed modes, cross-sub-array combination to maximize pre-processing sub-array spacing and diversity of relative configuration, a high-input analog nuller used on the pre-processing sub-array therein, a high-input analog nuller is used to null a dominant jamming signal, possibly exceeding normal communication signal levels, so that the sub-array processed signals could then be fed to an antenna processor with simultaneous beam steering and null steering.

Abstract: A method and a receiver for receiving positioning signals are disclosed. The positioning signals are received from a plurality of first sources in a first frequency range and from a plurality of second sources in a second frequency range different from the first frequency range. The receiver is switched between the first and second frequency ranges to receive the positioning signals, and the receiver obtains time offset information about a time taken to switch the receiver between the first and second frequency ranges, by obtaining a solution to a set of simultaneous equations based on combined navigation data for the first and second sources.

Abstract: Examples disclosed herein relate to a method performed at a first mobile station that includes receiving a request for positioning assistance data from a second mobile station over a communication link; and transmitting one or more messages to the second mobile station in response to the request, wherein the one or more messages include the requested positioning assistance data, wherein the first mobile station is on a synchronous network.

Abstract: The present invention relates to radar and antenna technique, and more particularly, to a radar apparatus and an antenna apparatus having antenna configuration of arranging a plurality of array antennas capable of concentrating antenna gain on a direction for sensing.

Abstract: A broadcasting device includes a broadcasting unit configured to broadcast positional information indicating the position of the broadcasting device; and a receiving unit configured to receive, from a communication terminal receiving the broadcast positional information, terminal identification information for identifying the communication terminal and the positional information.

Abstract: A method (40) of antenna array dynamic configuration for 3-Dimension beamforming in wireless network is provided, comprising: determining (41) dynamically a mapping pattern for transforming a physical antenna array into a virtual antenna array based on time-varying downlink or uplink baseband channel statistics, from a set of candidate mapping patterns; and configuring (42) the physical antenna array as different virtual antenna arrays according to the dynamically determined mapping pattern. The corresponding apparatus, antenna array and wireless base station system are also provided. These are used to improve radio transmission bandwidth communication efficiency.

Abstract: A random jitter beamforming method for reducing the influence of a side lobe to decrease a beam width, and a transmitter and a receiver using the same are provided. The random jitter beamforming method includes dividing a series of binary sequences to generate a plurality of bit groups, designating a beam pattern, corresponding to each of the bit groups, from a set of two or more beam patterns having the same gain and phase in a target direction, and forming a beam with the corresponding beam pattern, for each of the bit groups.

Abstract: A signal receiver receives a time-domain signal that includes a plurality of pilot tones at a plurality of corresponding frequencies. The time-domain signal is transmitted from a transmit location. The signal receiver extracts from the received time-domain signal pilot phase values corresponding to the pilot tones. The signal receiver computes a signal propagation time of the received time-domain signal by fitting an interpolation function to residual pilot phase values, corresponding to the extracted pilot phase values, and determines a slope of the interpolation function. The signal receiver computes a range between the transmit location and the signal receiver by multiplying the computed signal propagation time with the speed of light.

Abstract: An antenna apparatus may include a reflective layer connected to a ground, one or more first antennas disposed on the reflective layer, wherein each first antenna includes a first active element and one or more first parasitic elements; one or more first switching devices, each associated with corresponding one of the one or more first parasitic elements in at least one of one or more first antennas, one or more second antennas disposed on the reflective layer, wherein each second antenna includes a second active element and one or more second parasitic elements, and one or more second switching devices, each associated with corresponding one of the one or more second parasitic elements in at least one of one or more second antennas. The first antennas operate at a first frequency. The second antennas operate at a second frequency different from the first frequency.

Abstract: A method, comprising: detecting, at an apparatus, one or more radio signals from a first location; using the one or more detected radio signals to estimate a bearing from the first location; and using the bearing estimate to determine whether further detection of one or more radio signals is required before positioning the apparatus; and positioning of the apparatus using a bearing and constraint information.

Abstract: A method is provided for demodulating a signal carrying a message transmitted by a terrestrial beacon, executed by a system comprising a constellation of satellites suitable for detecting said signal and for repeating it towards receiving stations on the ground, and an analysis module suitable for receiving signals from said stations. Each receiving station transmits the signals that it receives from the satellite to the analysis module, said module realigning said signals in frequency and/or in time relative to one another, combining the realigned signals to generate a synthetic signal having an enhanced signal-to-noise ratio, and determining the content of said message and/or the modulation parameters of said synthetic signal. The method applies notably to the accurate and reliable location of distress beacons by a satellite system.

Abstract: Disclosed are systems, methods and devices for configuring a beacon transmitter for use in positioning operations of mobile devices. A beacon transmitter may be connected to a utility grade power source at a power cable. The beacon transmitter may also demodulate one or more data signals transmitted over the power cable to at least partially define a configuration for the beacon transmitter.

Abstract: A system detects the location of an uncooperative emitter by measuring the power level in an RF signal using a grid of linear antennas. The linear antennas are arranged in an x,y axis with intersections strategically placed in areas of interest. A detector detects the power level in each of the leaky signal cables. A processor in communication with the detector identifies the cable intersection having the greatest power level and associates that intersection as the location of the uncooperative emitter.

Abstract: The present system relates to radiation pattern control. More particularly, the present system is adapted for controlling a radiation pattern of a directional antenna. The system comprises a sample collection unit, a power angular spectrum estimation unit and a control unit. The sample collection unit is adapted for collecting a plurality of samples of a signal with a current radiation pattern and a plurality of samples of the signal with different radiation patterns. The power angular spectrum estimation unit is adapted for estimating a preliminary spectrum of the signal based on the collected plurality of samples with the current radiation pattern and for estimating an optimized spectrum of the signal based on the collected plurality of samples with different radiation patterns. Then, the control unit sets the radiation pattern of the directional antenna to the estimated optimized spectrum.

Abstract: This application discloses a GNSS reference apparatus having a vector error generator and a reference data server. The vector error generator generates one or more sequences of keyed intentional errors made confidential with confidential error keys, and then combines the sequences to generate a sequence of reference erroneous positions. The reference data server issues GNSS position-determination reference data based on the reference erroneous positions where the keyed intentional errors for at least one of the confidential sequences are reversible with confidential access to the corresponding confidential error key for determining a GNSS-based position.

Abstract: A system method for improving the accuracy of a tracking device is described where the tracking device cannot achieve an accurate GPS fix due to low observability. The system and method improves accuracy determining a current position for the tracking device using incomplete information from the GPS. The current position is added to a historical table of previous position determinations and a normalized center position is calculated from the current position and previous position determinations. The position of the tracking device is inferred from the normalized center position.

Abstract: Biometric monitoring devices, including various technologies that may be implemented in such devices, are discussed herein. Additionally, techniques, systems, and apparatuses are discussed herein for providing power-conserving techniques and systems for efficiently utilizing a GPS receiver are described. The positional fix frequency of the GPS receiver may, according to some implementations, be modified or adjusted between various levels according to data from one or more non-GPS sensors. Such non-GPS sensors may include, for example, ambient light intensity or spectrum sensors, accelerometers, gyroscopes, magnetometers, heart rate sensors, galvanic skin response sensors, infrared sensors, etc.