Abstract: An antenna device is disclosed. The antenna device includes a main antenna element and a sub antenna element, the sub antenna element being configured to form a mutual coupling with the main antenna element where a central axis of the sub antenna element forms an angle different from a right angle with a central axis of the main antenna element.

Abstract: A method and apparatus for calculating a ranging measurement in a cellular communications network. The method comprises: receiving (710) at a receiver (910) a first signal associated with a first cell-sector of a sectorised base station in the cellular communications network; determining (712; 812) at least one first time of arrival at the receiver (910) of a portion of the first signal; receiving (711) at the receiver (910) a second signal associated with a second cell-sector of the sectorised base-station; determining (713; 813) at least one second time of arrival at the receiver (910) of a portion of the second signal; and calculating (720; 820) a ranging measurement between the base station and the receiver (910), based on a combination of the at least one first time of arrival and the at least one second time of arrival.

Abstract: A circularly polarized antenna exhibiting a high performance characteristic can be produced by utilizing a ground plane, a half-loop, and an electric dipole in a predetermined configuration. The circularly polarized antenna can provide benefits, such as wide axial ratio bandwidth, high gain, and simple structure, over other unidirectional circularly polarized antennas.

Abstract: A method for constrained power allocation in a multiple input multiple output (MIMO) system, including: executing a singular value decomposition (SVD) operation upon a channel matrix; obtaining a diagonal matrix, wherein the diagonal matrix is composed of a plurality of local matrixes; and transforming diagonal elements of the diagonal matrix into diagonal elements of a specific diagonal vector from an upper-left corner local matrix and a lower-right corner local matrix, in parallel, simultaneously, and according to a sequence, by using a generalized triangular decomposition.

Abstract: A combined rescue beacon and flight recorder device for an airplane is ejectable, buoyant and/or provided with flotation devices. The combined rescue beacon and flight recorder device comprises a frame provided with at least one outer side surface having a solar panel. The combined rescue beacon and flight recorder device is configured to be placed in a housing created in an airfoil element of the aircraft.

Abstract: Methods of employing and using a hybrid transponder system to determine the size, extent, and orientation of a hydraulic fracture of a reservoir, are provided. An exemplary method can include the steps of inserting a plurality of transponders into a fluid, injecting the fluid carrying the transponders through casing perforations and at least one fracture aperture in a wellbore and into a hydraulic fracture, actuating each of the transponders by a reader to provide an acoustic return signal to the reader, determining a three-dimensional position of each of the transponders, mapping the location of the each of the transponders, and determining characteristics of the hydraulic fracture responsive to the three-dimensional position of each of the plurality of transponders. The method can be implemented utilizing a reader including an RF transmitter and one or more acoustic receivers along with typically a substantial plurality of transponders each containing an RF receiver and an acoustic transmitter.

Abstract: A robot cleaner system is described including a docking station to form a docking area within a predetermined angle range of a front side thereof, to form docking guide areas which do not overlap each other on the left and right sides of the docking area, and to transmit a docking guide signal such that the docking guide areas are distinguished as a first docking guide area and a second docking guide area according to an arrival distance of the docking guide signal. The robot cleaner system also includes a robot cleaner to move to the docking area along a boundary between the first docking guide area and the second docking guide area when the docking guide signal is sensed and to move along the docking area so as to perform docking when reaching the docking area.

Abstract: Systems for determining a size, extent, and orientation of a hydraulic fracture of a reservoir, are provided. An exemplary system can include a plurality of RFID transponders modified to include an acoustic transmitter, and an RFID reader modified to include both an RF transmitter and a pair of acoustic receivers, to be deployed in a wellbore adjacent a hydraulic fracture. The system includes program product configured to receive acoustic return signal data to determine the three-dimensional location of each RFID transponder within the reservoir, to map the location of each RFID transponder, and to responsively determine the size, extent, and orientation can be determined.

Abstract: A channel estimation matrix H describing a forward channel in which a signal travels from a first communication device to a second communication device is determined at the second communication device. QR decomposition on the channel estimation matrix H is performed, at the second communication device, to derive a unitary matrix Q and an upper triangular matrix R, such that H=QR. Only a portion of the upper triangular matrix R is transmitted, from the second communication device to the first communication device, so that the first communication device can use the portion of the upper triangular matrix R to precode signals to be transmitted by the first communication device.

Abstract: Provided is a simultaneous radio detection and bearing system. More specifically, the radio detection and bearing system includes an RF conditioning subsystem having a plurality of First Frequency Range and Second Frequency Range signal receiving channels. The RF conditioning subsystem operable to combine First Frequency Range and Second Frequency Range signals as a first internal data stream. A coherent multi-channel digitizer subsystem is coupled to the RF conditioning system, the coherent multi-channel digitizer subsystem operable to generate a time domain snapshot of the first internal data stream. An audio recording subsystem is also coupled to the RF conditioning subsystem. A processor is coupled to the coherent multi-channel digitizer subsystem and the audio recording subsystem.

Abstract: A method for locating a point in a first region based on receipt of a rf signal from the point. An antenna array is in the first region at a first position rotatable about an axis. A series of phase-array patterns is provided for implementation with the antenna array to provide measures of rf signal strength. Each pattern provides a plurality of reference values as a function of angle. A plurality of the phase-array patterns are used to acquire, in the first region, a plurality of rf signal strength values based on reception of the rf signal. A set of correlation values is determined where each value is a correlation between signal strength reference values and rf signal strength values acquired based on reception of the rf signal from the point. The correlation values identify a direction relative to the first position along which the point is located.

Abstract: Provided is a simultaneous radio detection and bearing system. More specifically, the radio detection and bearing system includes an RF conditioning subsystem having a plurality of First Frequency Range and Second Frequency Range signal receiving channels. The RF conditioning subsystem operable to combine First Frequency Range and Second Frequency Range signals as a first internal data stream. A coherent multi-channel digitizer subsystem is coupled to the RF conditioning system, the coherent multi-channel digitizer subsystem operable to generate a time domain snapshot of the first internal data stream. An audio recording subsystem is also coupled to the RF conditioning subsystem. A processor is coupled to the coherent multi-channel digitizer subsystem and the audio recording subsystem.

Abstract: A positioning system that includes a plurality of chronologically synchronized Time Division Multiple Access (TDMA) Positioning-Unit Devices and a position receiver incorporating a TDMA Adaptive Directional Antenna Array is disclosed. The plurality of chronologically synchronized Positioning-Unit Devices, positioned at known locations, transmit positioning signals in a predetermined Time Division Multiple Access (TDMA) sequence, such that each Positioning-Unit Device has a unique transmission time slot. The TDMA Adaptive Directional Antenna Array is configured to consecutively steer a directional receive antenna in spatial synchronization with the plurality of Time Division Multiple Access (TDMA) Positioning-Unit Device transmissions, such that the directional receive antenna is oriented toward the currently transmitting Positioning-Unit Device, or the directional receive antenna is oriented toward the origin of the currently received positioning signal.

Abstract: An antenna setting apparatus that allows a user to receive a broadcast from a desired direction easily and excellently is configured as follows: an antenna setting apparatus includes: a control unit changing the direction of a smart antenna with high sensitivity; a tuner extracting a signal; a CPU controlling the control unit, controlling the frequency of the signal extracted by the tuner and controlling the control unit to change the direction with high sensitivity; an OSD outputting an information set represented by the signal; a remote control reception unit accepting a selection; a first area of a memory storing an information set, where the information set is stored in association with the direction of the smart antenna and the frequency of the signal; and a second area of the memory storing the direction and the frequency corresponding to the information set designated by the selection.

Abstract: A method for determining the direction of an incoming signal is provided in which each of a plurality of receivers arranged in a linear array is sampled in sequence to simulate a single receiver moving along an aperture defined by the linear array at a simulated speed. This generates a simulated time series data from which a simulated Doppler shift in the incident angle is measured. The simulated Doppler shift is used to determine the incident angle between the incident signal and the linear array of receivers. By adjusting the simulated speed to eliminate artifacts in the power spectral density of the data obtained from the receivers, the incident angle can be obtain from the expression of the simulated Doppler shift.

Abstract: In an interferometer system, a revolving antenna array is used to sufficiently resolve all ambiguities in determination of frequency and direction of arrival of a wave-front. The frequency and direction of arrival are determined by matching predicted phase difference codes with an actual code measured at the antenna array, utilizing a cross-correlation technique. The number of parameters that can be simultaneously uniquely determined by the system depends on if the antenna array is rotated in planar or conical surfaces, and if the cross-correlation is uni- or multi-dimensional. The antenna array may include more than one baselines to enhance the system sensitivity and finding capacity.

Abstract: A method and apparatus for determining the position and/or the orientation of a movable object using a Doppler shift of electromagnetic signals. The apparatus includes a transmitter for transmitting a periodic electromagnetic signal, a sensor mountable on the object for receiving the signal transmitted by the transmitter and a controller in communication with the transmitter and the sensor for determining the position and/or orientation of the sensor relative the transmitter.

Abstract: A user equipment related multicast/multicast/broadcast multimedia service information present in a serving radio network controller can be coupled with the multicast/broadcast multimedia service controlling radio network controller service context in the corresponding controlling radio network controller over the interface between the radio network controller entities.

Abstract: A method and apparatus for reducing electromagnetic interference (EMI) and jamming in Global Positioning System (GPS) receivers operating on rolling or spinning platforms and/or environments is provided. An antenna system having a pair of diametrically-mounted elements provides interferometric cancellation for spatial and polarization nulling of interference signals. The antenna system, operating in conjunction with multiplexing and anti-jamming electronics, provides interference suppression for a GPS receiver connected thereto. Interference cancellation is provided in jamming and non-jamming environments by selectively employing spatial or polarization nulling of the interference signal.

Abstract: Active high density multi-element antenna system [DS] for radiolocation of RF target radiation has a processor-controlled antenna array [CAA] having rings [R1, R2, R3] concentric about a central axis to define arcuate sectors Sn about the central axis, each ring having adjacent p.c. boards [PC1, PC2, PC3] with PIN diode-switched antenna elements within sectors. The rings provide three rings [E1, E2, E3] of discrete dipolar elements, defining electrically isolated antenna units [ASm], each radial to the central axis, of quasi-log-periodic configuration. Antenna units are switched in rotational sequence about the central axis to provide narrow beam signal selectivity, directionally rotatable about the central axis. An array control system [ACS] is operated, as under microprocessor control [34], by a host system [HS] to cause RF scanning. PIN diode switching is used on printed circuit boards within the array.

Abstract: A signal transmission system comprising a transmitter, a rotating transmitting antenna connected to the transmitter, a receiver, and a receiving antenna connected to the receiver. A controller connected to the transmitter is adapted to control the transmitter based upon a location of the receiving antenna relative to the transmitting antenna. The controller is also adapted to limit a transmission of signals from the transmitter to when a predetermined beam pattern of the transmitting antenna is at least partially aligned with the receiving antenna.

Abstract: In a method for determining the roll attitude of a rolling flying object having a radio receiver, in particular for guiding a ballistic flying projectile/rocket having roll compensation, the aim is to determine a line of sight between a transmitting source and the antenna and to determine the roll attitude therefrom.

Abstract: A method for determining the position of a mobile station within a cellular telephone system having a plurality of base stations. A signal is transmitted from a rotating antenna. The rotating antenna has a beam which rotates around a cell in the cellular telephone system. The beam has a rotational timing that is known by the mobile station. The signal is received at the mobile station. Based on a reception time when the signal is received by the mobile station, an angular displacement value corresponding to the position of the mobile station is determined. A first round trip signal propagation time between a stationary antenna and the mobile station is measured using a voice information signal. The position of the mobile station is determined in accordance with the angular displacement value and the first round trip signal propagation time.A method for determining the position of a mobile station within a cellular telephone system having a plurality of base stations.

Abstract: Methods and systems for determining a position and an orientation utilize a radio frequency signal transmitted from an effective source location which moves along a first closed, non-planar path. The closed, non-planar path has a plurality of local extreme points with respect to a predetermined axis. The radio frequency signal is received at an effective receiving location which may, optionally, move along a second closed, non-planar path. A phase signal representative of the phase of the received radio frequency signal is detected. The phase signal is filtered and processed to form at least one signal quantity representative of elevation, bearing, and/or orientation.