Communications: directive radio wave systems and devices (e.g., radar, radio navigation) inventions 01/06

20060017604 - Selective-sampling receiver: A receiver that selectively samples a received signal in order to suppress an interference component of the signal while recovering a desired component. The selective sampling may be accomplished by low cost, low complex analog or digital circuitry. The receiver includes a first input that receives a first signal, including...

20060017605 - Millimeter wave portal imaging system: A millimeter wave portal imaging system for the detection of concealed weapons, explosives and other contraband items. A preferred millimeter wave imaging system includes a number (such as 64) of millimeter wave detection units each including a frequency scanning antenna and associated electronics. The units are mounted in four posts...

20060017607 - Amplitude modulator, selector switch, high frequency transmitting/receiving apparatus including the same, and radar apparatus, and radar apparatus-mounting vehicle and radar apparatus-mounting small ship: An amplitude modulator in which modulator characteristics can be tuned is provided. In an amplitude modulator, between two high frequency transmission lines for transmitting high frequency signals, is provided a PIN diode which is a high frequency modulating element that modulates a high frequency signal input from one of the...

20060017606 - High-frequency oscillator, high-frequency transmission-reception apparatus using the same, radar apparatus, and radar-apparatus-equipped vehicle and small boat equipped with the same: A high-frequency oscillator that can tune oscillation characteristics is provided. A high-frequency oscillator includes a Gunn diode serving as a high-frequency oscillation element that generates high-frequency signals, a resonator connected to the Gunn diode, a varactor diode serving as a variable-capacitance element that is disposed on the resonator and changes...

20060017608 - Methods and system suppressing clutter in a gain-block, radar-responsive tag system: Methods and systems reduce clutter interference in a radar-responsive tag system. A radar transmits a series of linear-frequency-modulated pulses and receives echo pulses from nearby terrain and from radar-responsive tags that may be in the imaged scene. Tags in the vicinity of the radar are activated by the radar's pulses....

20060017609 - Methods and systems for automatic zero calibration of radar altimeters: A method for operating a radar altimeter to perform a zero altitude calibration is described. The method includes determining a difference between an altitude measured by the radar altimeter and a desired altitude indication and upon receiving a zero calibration command, subtracting the difference from an altitude output by the...

20060017610 - Generating high precision ionospheric ground-truth measurements: A method, apparatus and article of manufacture provide ionospheric ground-truth measurements for use in a wide-area augmentation system (WAAS). Ionospheric pseudorange/code and carrier phase data as primary observables is received by a WAAS receiver. A polynomial fit is performed on the phase data that is examined to identify any cycle...

20060017611 - Moving reference receiver for rtk navigation: A method and system are provided to determine a relative position vector between primary receiver associated with a reference station and secondary receiver associated with a user. The method and system determine a position of the reference station at the reference station according to signals received thereat from a plurality...

20060017612 - Emergency reporting device: When an emergency report is generated in a bad signal receiving environment such as a town with concentrated buildings, an underground parking lot and indoor where the accuracy of position information acquired is deteriorated, an emergency reporting device 10 loaded in a vehicle 1 acquires the present position of the...

20060017613 - High doppler channel estimation for ofd multiple antenna systems: Fast fading in cellular systems causes time variation of the Channel Impulse Response (CIR) resulting in significant performance degradation that is reduced by adding a pulse train to the transmitted data symbols and estimating the CIR by averaging the symbols as they vary from one OFDM symbol to another within...

20060017614 - System and method for position determination by impulse radio: A system and a method for position determination by impulse radio using a first transceiver having a first clock providing a first reference signal and a second transceiver placed spaced from the first transceiver. The system determines the position of the second transceiver. The second transceiver has a second clock...

20060017615 - Receiver in a position-finding system and method for position-finding with increased sensitivity: The invention relates to a receiver in a position-finding system, having a calculation unit for calculating a statistical value from a received signal, and a detector unit for comparing the statistical value with a threshold value and for determining whether the signal is a synchronized position-finding signal. The system also...

20060012508 - Method of agile reduction of radar cross section using electromagnetic channelization: A method for reducing radar cross section of an object that has conductive portions and that is expected to be scanned by radar, which includes providing the object with a multiple layer radar cross section reducing structure that reduces or entraps or dissipates radar waves therein so that the size...

20060012509 - Radar detector for a motorcycle: A radar detector for a motorcycle having an electrical power supply and a receiver housing. The radar detector includes a housing adapted to attach to the receiver housing. The housing is divided into a right-hand side and a left-hand side. A plurality of user controls is disposed within the housing....

20060012510 - Vehicle activated millimeter-wave interrogating: An interrogating system can include an interrogating apparatus configured to transmit toward and receive from a subject in a subject position, millimeter-wave electromagnetic radiation. Such a system can also include a controller configured to operate the interrogating apparatus, and produce data representative of a characteristic of the subject from received...

20060012511 - Radar apparatus, radar apparatus controlling method: A radar apparatus comprises: a transmitter unit having a high-frequency oscillating unit whose oscillation frequency is variable, and a pulse amplitude modulating unit for amplitude-modulating a pulse of a transmission high-frequency signal output from the high-frequency oscillating unit with a first control pulse signal; a receiver unit having a gating...

20060012512 - Circuit for multifrequency band radar level gauge: A circuit for a radar level gauge for measuring the level of the surface of a product stored in a container, wherein the gauge includes a radar for transmitting microwave signals from a multiband antenna unit towards the surface for receiving microwave signals reflected by the surface and for determining...

20060012513 - Radar system using rf noise: A radar system that utilizes predetermined, pseudorandom, or random waveforms that may be substantially matched to the impulse response of the radar and any surrounding clutter such that the signal-to-clutter ratio may be optimized and/or such that specific targets may be identified and/or classified....

20060012515 - High sensitivity gps receiver and method for compensating for doppler variation: A global positioning system (GPS) receiver and method are provided for compensating for Doppler variation to accurately detect GPS signals in an environment in which intensities of the GPS signals received from GPS satellites are very low. A user acceleration measuring unit measures an acceleration vector of the terminal with...

20060012514 - Satellite navigation method: The invention concerns a satellite navigation method for determining the position of the receiver (1) by determining the signal travel time between the satellites (3, 4) and the receiver (1). Said method is characterized in that either the times of reception by the receiver (1) of the signals from the...

20060012516 - Method for positioning using gps in a restrictive coverage environment: A system consisting of a base GPS receiver with a clear view of the sky, one or more remote GPS receivers with restricted views of the sky and a processing center that batch processes range information provided by the GPS receivers determines the positions of the remote GPS receivers to...

20060012517 - Satellite information update system, positioning auxiliary information provision device, positioning auxiliary information provision device control method, positioning auxiliary information provision device control program, and computer readable recording: A positioning auxiliary information provision device 30 has: a auxiliary information generation device to generate positioning auxiliary information including satellite information; a satellite information update necessity determination device to determine the necessity of updating the satellite information; a satellite information update notification information generation device to generate satellite information update...

20060012518 - Method for enhancing the measuring accuracy in an antenna array: The invention refers to a method and a system for enhancing the measuring accuracy in an antenna array (1), where the method comprises the steps of; a) receiving analog signals on all antenna elements (2) at a first time t1; producing first values for a first radiation diagram from the...

20060012519 - Optical control type phased array antenna: An optical control type phased array antenna includes a laser generating means for generating light of single wavelength, an optical path branching means for branching the light emitted from the laser generating means into first and second transmission lights, a high frequency signal generating means for generating a high frequency...

20060012520 - Hybrid beamforming apparatus and method for the same: A hybrid beamforming apparatus and method are proposed for a communication system. The hybrid beamforming apparatus includes a plurality of antennas, a plurality of FFT, a plurality of hybrid weight-coefficient generators and a plurality of adders. In each of the hybrid weight-coefficient generators, the weight coefficient for each subcarrier is...

20060012521 - System and method for the mitigation of multipath and the improvement of signal-to-noise ratios in time division multiple access(tdma) location networks: 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...

20060012522 - Receiver for a position-finding system with improved sensitivity: A receiver (1) of a position-finding system comprises a calculation unit (6, 7, 8) for calculation of a statistical value (A) on the basis of a received signal, and a detector unit (9) for comparison of the statistical value (A) with a threshold value (K) and for determining whether the...

20060012523 - Reliability and the accuracy of position-finding methods by estimation of the rice factor of a radio link: In order to improve the reliability and the accuracy of a position-finding method such as the GPS method, the quality of a radio link which is used for the position-finding method is determined by estimating a parameter, in particular the Rice factor of the amplitude distribution density, which is characteristic...

20060007034 - Composite radar absorption structure with a thin shell type and method for manufacturing the same: A composite radar absorption structure with a thin shell type and a method for manufacturing the same are provided. The composite radar absorption structure at lease comprising a continuous fibrous material and a plurality of filling mediums, wherein the plurality of filling mediums are uniformly distributed over the surface perpendicular...

20060007035 - Airport safety system: An airport safety system is disclosed, comprising surface movement radar for monitoring the movement of aircraft and land vehicles on an airport, said surface movement radar providing a signal input to a computer arranged to identify from the relative motions of aircraft and vehicles detected by the radar in accordance...

20060007036 - Radar device: A radar device uses a transmission signal outputted from a transmission antenna and a reception signal as an incoming wave reflected from a target object through an arrangement of reception antennas for estimating an angle of the incoming wave. An incoming wave estimation process stores a threshold for each beat...

20060007037 - Temperature compensation improvements in radar apparatus: A radar-based distance measurement apparatus comprises a microwave circuit comprising a frequency generator which produces a microwave frequency signal, the frequency of which is modulated by an amount determined by a modulation signal applied to the frequency generator, a temperature sensor which measures the temperature of at least a part...

20060007039 - Method of and system for expanding localized missing customer-vehicle law enforcement-aided vhf recovery networks with location-on-demand supplemental service features via such networks for improved law enforcement-aided recovery, and via the internet for: A system and technique for improving the speed and ease of missing vehicle location and recovery by vehicle-carried transponder periodic coded replies to radio interrogation by a network of (VHF) transmitting towers, by integrating a concealed GPS location receiver with the transponder and providing the GPS-obtained coordinate information through the...

20060007038 - Two-way distress alert and emergency location apparatus and method: A portable emergency communication device includes a first receiver for receiving location determination signals from the global positioning satellite (GPS) system, and a second receiver for receiving incoming signals from a subscriber-based satellite radio system, such as the Sirius or XM satellite radio service providers. The device includes a transmitter...

20060007041 - Null-fill antenna, omni antenna, and radio communication equipment: A wide-angle null-fill antenna with no null in the depression angle range, an omni antenna using the same, and radio communication equipment. A null-fill antenna comprises a first antenna array including antenna elements arranged with a prescribed point as the center, and a second antenna array having amplitude characteristics substantially...

20060007040 - Radio frequency signal receiving apparatus, a radio frequency signal transmitting apparatus, and a calibration method: The disclosed radio frequency signal transmitting and receiving apparatuses compensate for phase and amplitude differences without detecting sync timing of a calibration signal. The radio frequency signal receiving apparatus consists of two or more antennas, radio frequency signal receiving units each being connected to an antenna, a calibration signal generating...

20060007042 - Multibeam scanning optical apparatus and multibeam image forming apparatus: A multibeam scanning optical apparatus incluses a controller which specifies laser diodes which are emitting light normally and arranged in a continuous row, a memory having a plurality of area in which image data are stored, a write-in controller which causes image data for each line to be written into...

20060007043 - Method and device for tracking the directions-of-arrival of radio waves: L overlapping forward subarrays with {overscore (q)} (≧q) antenna elements are formed with, where q is the number of desired signals, a cyclic correlation matrix is formed from the cyclic correlations between the received signals of L forward subarrays and a received signal of the first predetermined antenna element, the...

20060001566 - Method and device for course prediction in motor vehicles: A method and a device for course prediction in motor vehicles, which have a position-finding system for objects situated in front of the vehicle, where a function describing the path of the roadway is calculated on the basis of measured distance and angular data, in that several fixed targets are...

20060001567 - Sensor with improved voltage protection: A radar level gauge using microwaves for measuring a level of a surface of a product in a container, comprising a two-wire interface for connecting said measurement circuitry externally of said radar level gauge. A voltage protection circuitry connected between the two lines of the two-wire interface, the voltage protection...

20060001568 - Method and apparatus for providing an electronic warfare target simulator: An electronic warfare target simulator is a small, low power, programmable target simulator for Defence electronic warfare operators to use for training in Electronic Warfare deception and jamming techniques and to aid in the calibration of radio direction finding equipment. The invention includes methods and apparatus for the replay of...

20060001569 - Radiometric propulsion system: A highly efficient propulsion system for flying, floating, and ground vehicles that operates in an atmosphere under standard conditions according to radiometric principles. The propulsion system comprises specially fabricated plates that exhibit large linear thrust forces upon application of a temperature gradient across edge surfaces. Several embodiments are presented. The...

20060001570 - Method and apparatus for location-based triggering in an assisted satellite positioning system: Method and apparatus for location-based triggering in a mobile receiver is described. In one example, a triggering region is designated. Expected pseudorange data is generated within the mobile receiver and pseudoranges to a plurality of satellites are measured. A delta position is computed with respect to a virtual center of...