Abstract: A system and method of generating a radio frequency signal adapted for allowing a receiving device to calculate a navigational indicator relative to a plurality of antennas. The system comprising a radio frequency generator unit for generating: a primary signal for driving at least one antenna of the plurality of antennas to provide a primary transmission; and an actively derived secondary signal to complement the primary signal for driving at least one other antenna of the plurality of antennas to provide, collectively with the primary transmission, the combined transmission, wherein the combined transmission, relative to the primary transmission only, provides a reduced observed distortion at the receiving device.

Abstract: A method and system for beamforming signal transmission under a per-antenna power constraint is presented. In one aspect, a multiple input multiple output (MIMO) transmitting station may compute a per-antenna power gain factor for each of a plurality of transmit chain signals. The transmit chain signals may be concurrently transmitted by a plurality of transmitting antennas at the MIMO transmitting station. The plurality of transmit chain signals may correspond to beamforming signals, which are generated by performing spatial mapping on a plurality of space-time signals. The plurality of power gain factors may be computed based on a per-antenna power constraint. Alternatively, the plurality of power gain factors may be computed based on joint per-antenna power and total-power constraints. Each of the transmit chain signals may be amplified or attenuated based on the corresponding antenna gain factor. The amplified or attenuated signal is then transmitted by the corresponding transmitting antenna.

Abstract: A subreflector tracking method, apparatus and system incorporating sensor feedback of the precise subreflector angular position of a nutating subreflector. The subreflector nutation generated by coupling the subreflector, off center, to a rotating support. Monitoring of the received signal strength peak during a rotation of the subreflector generating an error vector designating a direction in which to move the subreflector to track the signal.

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: A monitor antenna receives radio waves transmitted from a Doppler very high frequency omnidirectional radio range (DVOR) device and includes a carrier signal and a subcarrier signal, orthogonal detectors shift a phase of a signal of each subcarrier component by a phase difference equivalent to a prescribed distance away from the DVOR apparatus relative to a signal of a carrier component, and a combiner combines signals of the carrier component and the subcarrier component to output the combined signal to a DVOR demodulator.

Abstract: Provided are an apparatus for searching a distress signal and a controlling method thereof. The apparatus for searching a distress signal includes: a beacon receiver receiving the distress signal transmitted from a distress beacon apparatus of a COSPAS-SARSAT system; a decoder decoding the distress signal to acquire distress information; and a display unit displaying the acquired distress information. The apparatus for searching a distress signal is used by a search and rescue team.

Abstract: A distress beacon and associated detection system for water borne activities are disclosed.

Abstract: An emergency beacon includes a housing fitted with a connector for connecting the beacon to an antenna that is external to the housing. Inside the housing, the beacon includes an incident sensor, a transmitter, a detection and control member connected to the sensor and transmitter and arranged to trigger operation of the transmitter when an incident is detected. The beacon further includes, inside the housing, an incorporated antenna, a changeover switch interposed between the transmitter and the connector and also interposed between the transmitter and the incorporated antenna, and a sensitive member sensitive to the electromagnetic power conveyed towards the connector and to the electromagnetic power returned by the connector. The sensitive member is connected to the control member which is connected to the changeover switch and is programmed to deliver the signals from the transmitter to the external or incorporated antenna, depending on the state of the sensitive member.

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: 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: Methods and by which a radio signal transmitter of a photographic device may be configured to adhere to the local legal and regulatory limits of a specific region based on a locational fix data derived from a global positioning system GPS receiver of the photographic device.

Abstract: The invention relates to an apparatus and method for estimating the distance between a transmitter and a receiver. A method comprising obtaining a signal from a receiver; determining whether the signal more likely propagated through a line-of-sight (LOS) radio channel or a non lme-of-sight (NLOS) radio channel; using a model including parameters selected according to the radio channel to estimate the distance between the receiver and a transmitter which sent the signal.

Abstract: An apparatus that can transmit a signal enabling higher accuracy of calculating positional information is provided. A transmitting apparatus transmitting a positioning signal includes an oven controller crystal oscillator (OCXO) having a thermostatic oven that keeps the temperature of a quartz resonator constant and oscillates such that variation in output frequency caused by the ambient temperature change is minimized, a voltage controlled oscillator (VCO) outputting a signal modulated in accordance with the signal from OCXO, multipliers, a code generator outputting code patterns for respectively identifying each of artificial satellites on which the transmitting apparatus is mounted to multiplier, a memory storing a navigation message, a transmitting portion, and an antenna.

Abstract: A system and method to normalize a tracking control signal in a directional antenna system to reduce interference from an interfering adjacent transponder is presented. The system and method scans for the tracking signal along a scan path to produce a received signal strength indicator (RSSI) signal, coherently detects an RSSI image from the RSSI signal, and performs a morphologic feature estimation of the RSSI signal image to produce and output a normalized tracking correction.

Abstract: A radar system includes a memory device operable to store radar-return data characterizing at least one geographic region, a database including a set of chart data representing fixed landmarks associated with the at least one geographic region, and a processor coupled to the memory device. The processor is configured to obtain from the memory device multiple sets of the radar-return data corresponding to successive scans of the at least one geographic region, perform correlation processing among the multiple data sets to yield a first correlated data set, perform correlation processing between the first correlated data set and fixed-landmark chart data associated with the at least one geographic region to yield a second correlated data set, and process the second correlated data set to remove said fixed-landmark chart data therefrom and yield a third data set representing scanned objects that are not fixed landmarks.

Abstract: A system and a method for estimating a state of a carrier are provided. The system includes the carrier, an electromagnetic wave sensing device, a motion sensing device, and a controller. The electromagnetic wave sensing device detects an electromagnetic wave emitted by at least one feature object in an environment around the carrier. The motion sensing device detects motion information of the carrier moving in the environment. The controller estimates state information of the carrier in the environment through a probabilistic algorithm according to the electromagnetic wave and motion information detected by aforementioned sensing devices. Thereby, in the present invention, the location and posture of the carrier in the environment can be precisely estimated according to the motion information of the carrier and existing information of the environment around the same.

Abstract: One or more embodiments of the present invention relates to the design an adaptive transmit non-periodic ON-OFF pulse width modulated (PWM) signal sequence over a radar dwell time that is matched to the target and clutter characteristics so as to maximize the target response adaptively. In this context, in the first step, some optimality criterion such as maximizing the ratio of the target output signal power to the mean clutter power at the receiver input is used to design a pre-transmit waveform. In the second step, a Pulse Width Modulation method is used to convert the pre-transmit waveform so designed to a non-periodic ON-OFF pulse width modulated (PWM) waveform signal without destroying the target and clutter matching characteristics of the pre-transmit signal. This allows maximum response from the target and minimum response from the clutter and the environment when the target and its surroundings are interrogated with the non-periodic ON-OFF pulse width modulated (PWM) signal waveform.

Abstract: An apparatus for providing and detecting information regarding a person, location, or object includes a power supply, a helicoil dipole antenna, a transmitter, a receiver configured to receive signals from remote transmitters at a designated frequency, a computer processor, and a memory device configured to store an identifier associated with the apparatus. Logic instructions embedded on the memory device are configured to compare an identifier decoded from received signals to the identifier associated with the apparatus. When the identifier decoded matches the identifier associated with the apparatus, the instructions decode a return frequency from the signal, and generate return signals. The return signals include the identifier associated with the apparatus, the transmitter is activated only when the transmitter transmits the return signals at the return frequency.

Abstract: A method of determining speed and heading of a rover/rover having one degree of freedom comprising the following steps: (A) determining a rover position coordinates using at least one source of a radio position measurements; (B) storing a set of statistically different rover points in a memory block, and (C) using a subset of rover points including a plurality of stored rover points and a current rover point to determine a speed and a heading of the rover. It is assumed that each rover point comprises a time Epoch and a rover position determined at time Epoch, and that each pair of statistically different rover points comprises two rover positions separated by a statistically significant distance.

Abstract: A transmitter system can have a higher power transmitter and a lower power that are configured to transmit a pair of unbalanced radio frequency beams to a target so as to produce a difference frequency in the target. The difference frequency can disrupt operation of a device, such as a weapon. The difference frequency can provide a radar return. The use of a higher power transmitter and a lower power transmitter reduces costs, size, and weight as compared to the use of two higher power transmitters.

Abstract: A distribution device for a glide guidance component, the distribution device including an array of antenna elements installed on a pylon. The distribution device includes: a first and a second input for receiving a CSB (carrier plus sideband) input signal and an SBO (sideband only) input signal respectively, a plurality of outputs connectable to the array and including a first and a second output for the first and second output signals, respectively; each of said output signals including a CSB component and an SBO component. The array of antenna elements is such as to irradiate an image-less type pattern and the distribution device is such that the outputs have an substantially equal amplitude value for each pair arranged symmetrically around a central point of the array and a phase difference which is identical for the two CSB and SBO components.

Abstract: A method and apparatus for wireless transmission of electrically complex or phase-critical signals includes a device for measuring the length of a transmission route to a moving platform, and a device for transmitting complex measuring or reference signals. According to the invention, components of the device for transmitting the signals are arranged adjacent components of the device for measuring the length of the transmission route, so that changes of the length of the transmission route are the same for both devices.

Abstract: The present invention is an apparatus and method for simultaneously processing multiple communication and navigation signals. An apparatus of the present invention may comprise a single receiver with a direct radio frequency (RF) sampling front end, a single analog to digital converter, a digital downconverter and a digital signal processor. In an embodiment of the invention, the receiver of the present invention may simultaneously process navigation signals in the 108-118 MHz band and communication signals in the 118-137 MHz band.

Abstract: The present invention is a new multifunctional low-cost solution for performing measurements and positioning in construction sites and automatically extracting a three-dimensional virtual model, plans, elevations and sections drawings based on these measurements. The preferred embodiment of the present invention consists of a field beacon or a set of field beacons, spread around the measured area, communicating by omnidirectional signals with at least one central signal collector, which communicates with a computer. Dedicated computer software performs the spatial calculations and other applicable functions. The disclosed system is used for laying out axes and columns at the beginning stage of construction while ensuring the exact match of each mark to its planned position, and for quality and exactitude control of constructions or assembling. In addition the system may be used for locating and tracking objects in a predefined area and automatic directing of machinery to target points.

Abstract: The invention relates to one or more methods for locating a shopper's, associate's, manager's or vendor's presumed position in a store using a communication multi-network for communication in the store. Specifically, at least one location device is positioned in proximity to, for example, a shopper such that the shopper's presumed position about the store may be known continuously or upon demand to the store.

Abstract: An apparatus and method for beamforming in a multi-antenna system are provided. The method includes assuming at least one codeword comprised in a codebook as a precoding weight of a reference receive end and generating post-processing weights of at least two receive ends, confirming a codeword maximizing a sum rate using the post-processing weights, generating preceding weights of the receive ends using the codeword maximizing the sum rate, and precoding a transmit signal using the generated precoding weights and transmitting the precoded transmit signal to each receive end.

Abstract: A method of electronically tracking and locating a very large number of objects such as, but not limited to, personal case files in health care, law, or human services systems is described. Each object to be tracked has an attached miniature radio transmitter called a tag which sends a coded signal to a network of receiver base stations with limited but overlapping reception ranges. Each receiver base station places in its own memory the time at which a record enters its range, remains in range, and the time at which it leaves. The various receiver base stations are interconnected to a host computer. By polling the memories of each receiver base station, the computer is able to determine the current location of any record.

Abstract: A monitor antenna receives radio waves transmitted from a Doppler very high frequency omnidirectional radio range (DVOR) device and includes a carrier signal and a subcarrier signal, orthogonal detectors shift a phase of a signal of each subcarrier component by a phase difference equivalent to a prescribed distance away from the DVOR apparatus relative to a signal of a carrier component, and a combiner combines signals of the carrier component and the subcarrier component to output the combined signal to a DVOR demodulator.

Abstract: A radar apparatus having a transmit antenna which transmits a transmit wave, a receive antenna which receives a receive wave including a reflected wave reflected on a target of the transmit wave; and an interference detection unit which judges that interference has occurred, when, of the receive waves received by the receive antenna, an average value of received power corresponding to a large distance from the radar apparatus is a threshold value or more.

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: It is possible to accurately estimate propagation considering diffraction without significantly increasing the operation processing amount.

Abstract: The present invention discloses a wrist-worn wireless communication device coupled with an RF antenna configured to operate folded or coiled in the device, or extended along the arm from wrist to elbow. A typical embodiment of the invention relates to an emergency radio beacon, particularly for satellite based systems such as a Personal Locator Beacon (PLB) for the Cospas-Sarsat system.

Abstract: Positional information is provided at a place out of reach of radio wave. The process executed by a positional information providing apparatus includes the steps of: obtaining a received positioning signal (S610); specifying an emission source of the positioning signal (S612); obtaining, when the emission source of the positioning signal is outdoors, a navigation message included in the positioning signal (S622); executing a process for calculating the position based on the signal (S624); obtaining, when the emission source of the positioning signal is indoors, message data from the positioning signal (S630); obtaining coordinate values from the data (S632); and displaying positional information based on the coordinate values (S650).

Abstract: An image forming system and apparatus are provided which utilizes a portable terminal such as a cellular phone when printing and outputting map data, etc. On a network by separating the operation through the cellular phones from the operation through a terminal printer. The system includes a portable terminal that is connected to a network via a gateway through radio communication and provides a desired map destination data to a server. The server receives the destination data via the network and stores the destination data in a prescribed area. A printer that is connected to the server provides its position data to the server and receives a map data comprising the position data of the printer as a starting point and the destination data as an ending point and prints this map data.

Abstract: The present invention discloses a device and method for precisely determining the direction and distance to a satellite radio beacon. In one embodiment, the disclosed device is used for SAR (search and rescue) of people in distress, upon activation of an emergency radio beacon, such as a marine EPIRB (Emergency Position Indicating Radio Beacon) or an airborne ELT (Emergency Locator Transmitter) or a terrestrial PLB (Personal Location Beacon) or a marine SSAS (Ship Security Alert System) beacon, beacons which are part of the Cospas-Sarsat system.

Abstract: An emergency beacon includes a housing fitted with a connector for connecting the beacon to an antenna that is external to the housing. Inside the housing, the beacon includes an incident sensor, a transmitter, a detection and control member connected to the sensor and transmitter and arranged to trigger operation of the transmitter when an incident is detected. The beacon further includes, inside the housing, an incorporated antenna, a changeover switch interposed between the transmitter and the connector and also interposed between the transmitter and the incorporated antenna, and a sensitive member sensitive to the electromagnetic power conveyed towards the connector and to the electromagnetic power returned by the connector. The sensitive member is connected to the control member which is connected to the changeover switch and is programmed to deliver the signals from the transmitter to the external or incorporated antenna, depending on the state of the sensitive member.

Abstract: A first location determining receiver determines a first location estimate of a vehicle. The first location determining receiver is associated with satellite beacons. A second location determining receiver determines a second location estimate of a vehicle. The second location determining receiver is exclusively associated with terrestrial beacons. A selector selects the first location estimate of the vehicle as a preferential location in accordance with an initialization scheme for the vehicle in a work area. A filtering module applies a first weight to a first location and a second weight to the second location to derive a weighted estimate as the preferential location upon satisfactory completion of the initialization scheme.

Abstract: A method, apparatus for reducing errors in a plurality of beacon beams is disclosed. The method comprises the steps of computing quantized channel weights {tilde over (W)}c from channel weights Wc for at least some of the channels; estimating the quantization error ?Ba for each of the beacon beams from a difference between the channel weights Wc and the computed quantized channel weights {tilde over (W)}c; and adding the estimated quantization error ?Ba to the beacon beams. Similarly, a beacon biases equivalent to the beacon asymmetry error can be computed by the ground beacon beam forming software and uploaded to the on-board software for error compensation. The apparatus comprises one or more means, such as a processor communicatively coupled to a memory storing instructions for performing these operations.

Abstract: A method and system for analog beamforming in a wireless system is provided. Analog beamforming involves performing an iterative beam acquisition process based on beam search training, determining transmit and receive beamforming vectors including phase weighting coefficients, based on the iterative beam acquisition process. Each iteration includes estimating the receive and transmit beamforming coefficients alternatively, until the receive and transmit beamforming coefficients converge.

Abstract: One embodiment includes a radar system for range measurement having a first operating mode for measurement in a first range zone and having a second operating mode for measurement in a second range zone. The radar system includes a radio-frequency transmission module, at least one antenna, and a control and processing unit. The radio-frequency transmission module has an oscillator for providing a transmission signal with a first frequency spectrum in the first operating mode, and with a second frequency spectrum in the second operating mode. The at least one antenna is connected to the radio-frequency module. The control and processing unit provides control signals which are supplied to the radio-frequency transmission module for selecting the operating modes.

Abstract: According to one embodiment of the present invention, a novel method and system are disclosed. In one embodiment, a first node records a first node local time of receiving a wirelessly transmitted packet, the first node local time recorded with a monotonically increasing clock of the first node. The first node wirelessly transmits the recorded local time to at least a second node. The second node records a second node local time of receiving the wirelessly transmitted packet and records the first node local time of receiving the wirelessly transmitted packet. The second node updates a second node timing model to synchronize with the first node, the updating based on the second node local time of receiving the wirelessly transmitted packet and the first node local time of receiving the wirelessly transmitted packet.

Abstract: A system for locating a position marker includes a locating device for locating the position marker, and a GPS device communicatively coupled to the locating device that provides GPS coordinate data when the position marker is located by the locating device. Electronic memory is provided in at least one of the locating device and the GPS device for storing a data record associating the GPS coordinate data with the located position marker.

Abstract: A digital broadcasting receiver having a location registration and notification function is disclosed. The receiver includes a receiving unit for receiving data including identification information of a gap filler; an input unit for inputting a location registration request signal; a sub-controller for detecting gap filler identification information (GFID) from the digital broadcasting data; a main controller for creating location identification information corresponding to the GFID in response to the location registration request signal; and a location information storage unit for storing the GFID and the location identification information.

Abstract: An assembly for tracking an animal which has been shot by an arrow. A shank portion of an arrow is received in a bushing which in turn receives a housing for a transmitter. The housing is retained on the bushing during arrow flight by an elastomeric ring. Upon impact of the arrow with the animal, the elastomeric ring is dislodged, releasing the housing from the bushing. Associated with the housing are members which penetrate the animal to attach the housing to the animal. A hand-held direction finding receiver receives signals from the transmitter so that direction to the animal is determined.

Abstract: A chaotic wireless communication apparatus for transmitting/receiving data based on a chaotic signal is provided. The apparatus includes a chaotic Radio Frequency (RF) processing means and a digital modem. The chaotic RF processing means includes a chaotic RF receiving unit for extracting a spreading digital signal from an RF signal using a chaotic signal as a carrier signal, and a chaotic RF transmitting unit for transforming the spreading digital signal into the chaotic signal. The digital modem a digital demodulating unit for dispreading spreading digital data extracted from the chaotic RF receiving unit and creating information data to be received, and a digital demodulating unit for spreading information data to be transmitted and creating the spreading digital signal.

Abstract: An arbitrary number of signaling beacons are synchronized simultaneously and automatically by a received modulated control signal in accordance with an arbitrary communication protocol over a communication link which may be separate from or superimposed upon a perceptible signal periodically provided from signaling beacons. The periodic perceptible signal may be stabilized using a crystal oscillator or an external transmitted signal such as a global positioning system (GPS) signal and synchronization thus maintained for extended periods of time even when the synchronization communication link is not available. Interference is substantially prevented by the communication protocol while supporting the provision of any desired beacon control functions.

Abstract: A search and rescue beacon includes a main transmitter transmitting a Cospas-Sarsat signal at a main frequency and an auxiliary homing transmitter transmitting a homing signal at a homing frequency close to the main frequency. Advantageously both the Cospas-Sarsat signal and the homing signal are generated by a single synthesizer switching between a main Cospas-Sarsat burst transmission and a continuous homing frequency transmission of the homing signal. The Cospas-Sarsat signal is advantageously transmitted at a higher power than the homing signal. The single synthesizer may use a single amplifier chain. The single synthesizer and amplifier chain may use a single antenna.

Abstract: The invention relates to a method and to devices for determining in a positioning system the time of reception of a beacon signal which was received and tracked by a receiver. In order to enable a re-acquisition of the system time based on a noisy received signal, it is proposed that the method comprises as a first step reconstructing a beacon signal for an interval based on available information. Then, a cross-correlation is performed between the reconstructed signal and the received signal at different relative positions to each other. Next, the time of transmission of the received signal is determined based on information for the reconstructed signal and on the relative position resulting in the maximum correlation value. Finally, a time of reception of said received signal is determined as the sum of the determined time of transmission of the received signal and of a calculated time of flight of the received signal.

Abstract: A communication system is formed by a location information providing unit configured to provide a location information indicating a location of each road related facility arranged along a road, and a communication unit installed on each road related facility, configured to transmit the location information of each road related facility to a terminal device of a user on the road by using weak radio signals, such that the terminal device that can receive the weak radio signals can detect a location of the terminal device according to the location information.

Abstract: A method and device for determining a temporal point of reference when receiving a radio signal, especially in a mobile radio system. The radio signal is received with a time-variant received strength in a temporally indeterminate manner. A received-strength determining unit determines the received strength as a function of the time of reception for a plurality of evaluation time intervals, a time base being defined repetitively for each of the evaluation time intervals. An averaging unit averages the received strength over the evaluation time intervals, the received strengths in each case resulting in a mean time-dependent received strength at identical times with respect to the individual time bases. A time-determining unit determines the temporal point of reference from the mean received strength as a function of time.