Communications: directive radio wave systems and devices (e.g., radar, radio navigation) inventions 03/06

20060066467 - Electromagnetic wave absorber: An electromagnetic wave absorber includes a first electromagnetic wave absorbent member containing a magnetic loss material, and a second electromagnetic wave absorbent member containing a conducting material arranged in front of the first electromagnetic wave absorbent member. The second electromagnetic wave absorbent member has a shape including an aperture at...

20060066468 - Radar detection helmet visor: A radar detection device, radar detection device container, and a method includes a housing configured to attach to a motorcycle helmet to shield eyes of a motorcycle helmet wearer from overhead sunshine. The housing defines a void configured to house a radar detection circuit. The circuit is configured to reside...

20060066469 - Three-dimensional surface/contour processing based on electromagnetic radiation interrogation: One embodiment of the present invention includes scanning a target with electromagnetic radiation including one or more frequencies in a range of about 200 MHz to about 1 THz; establishing a point cloud representation of the surface of the target from the scan; and performing one or more curve-fitting operations...

20060066470 - Ground vehicle collision prevention systems and methods: The present invention comprises systems and methods for preventing collisions between aircraft and ground vehicles. In one embodiment, a system includes a proximity detection unit and a transducer proximate to a selected structural portion of an aircraft, the proximity detection unit being operable to emit ranging signals through the transducer...

20060066471 - Robust and broadband signal processing using replica generation apparatus: Embodiments of the present invention are low cost, robust, broadband, optimum, high precision methods and apparatus of processing pulsed, transient, non-cooperative, non-reproducible, complex, or simultaneous signals based on correlation measurements utilizing optical RF signal train generators. An embodiment of the inventive apparatus comprises: (a) a signal receiving apparatus which receives...

20060066472 - Method and system for detecting with radar the passage by a vehicle of a point for monitoring on a road: The invention relates to a method for detecting the passage by a vehicle of a determined point for monitoring on a road, wherein from a remotely situated location a radar beam is transmitted continuously to the point for monitoring, reflections from the transmitted radar beam are received at the remotely...

20060066473 - Pulse wave radar device: To achieve a purpose of accurately detecting a distance to a target even in a close range, a pulse wave radar device according to the present invention cuts off an output of a demodulation circuit so that no of receiving pulse may be detected, during a period when a transmitting...

20060066474 - Apparatus for estimating direction of arrival of signal: An apparatus for estimating direction of arrival of signal is provided that has excellent performance in terms of angular resolution and the number of signals that can be identified. In an array sensor comprising a plurality of sensor elements, the two outermost sensor elements are alternately selected by a switch...

20060066475 - Method for reducing angular blur in radar pictures: is determined in each range bin for a plurality of angular values x, the term “angle correction” comprising derivative(s) of first or higher order of the variable S(x). The variable measured at the angular position “angular position” is the moved to the variable in the angular position “corrected angular position”...

20060066476 - Acousto-radio frequency modulator and applications therefore: An acousto-radio frequency modulator and an apparatus employing the same are disclosed. The acousto-radio frequency modulator includes a radiowave waveguide including a first end defining an input and a second end defining an output; an acousto-radio material positioned in the signal path of the radiowave waveguide; and a acoustic source...

20060066477 - Dive computer with global positioning system receiver: Dive computers and methods of logging information including position, audio and video information are disclosed. In one embodiment, the invention includes a processor, a global positioning system receiver connected to the processor and a pressure transducer connected to the processor....

20060066479 - Method and system for variable data rate transmission in rtk gps survey system: A method and system for variable data rate transmission in a real-time kinematic (RTK) positioning system. An RTK positioning system having a reference station and a rover utilizes wireless communications for data transfer. the data transmission rate between the reference station and the rover is dynamically controlled by a programmable...

20060066478 - Positioning system, positioning apparatus, positioning information providing apparatus, positioning method, control program for positioning system, and computer readable recording medium having recorded therein control program for positioning system: A positioning system is provided to set easily initial position information at a low cost without using a database in which positions of base stations are stored. A GPS server 200 has a server positioning section 210a that receives a position related signal transmitted by a GPS satellite to obtain...

20060066481 - Blind signal separation using a combination of correlated and uncorrelated antenna elements: A communications device for separating source signals provided by M signal sources includes an antenna array comprising N antenna elements for receiving at least N different summations of the M source signals, with N and M being greater than 1. The N antenna elements include at least one antenna element...

20060066482 - Blind signal separation using i and q components: A communications device for separating source signals provided by M signal sources includes an antenna array comprising N antenna elements for receiving at least N different summations of the M source signals. A respective in-phase and quadrature module is connected downstream to each antenna element for separating each one of...

20060066483 - Blind signal separation using signal path selection: A communications device for separating source signals provided by M signal sources includes an antenna array comprising N elements for forming at least N antenna beams for receiving at least N different summations of the M source signals, with N and M being greater than 2. A controller is connected...

20060066480 - Blind signal separation using spreading codes: A communications device for separating source signals provided by M signal sources includes an antenna array comprising N antenna elements for receiving at least N different summations of the M source signals. A code despreader is connected to the N antenna elements for decoding the at least N different summations...

20060066484 - Method and system for determining direction of transmission using multi-facet antenna: A method for determining direction of transmission using an antenna array having a number of panels is disclosed. Each panel is configured to receive signals. According to one aspect of the method, each of the panels is directed to receive signals from a transmitting node. For each panel, a first...

20060066486 - Radio signal transmitter with multiple antennas for improved position detection: A radio frequency (RF) signal transmission device (the “device”) is used as a tracked target in a position tracking system (the “system”). In the preferred embodiments, the device's position is determined by analyzing the time difference of arrival of the device's RF signals received at multiple receivers which are part...

20060066485 - Wireless tracking system based upon phase differences: A system and method of obtaining high accuracy position information relating to one or more mobile transmitters within a wireless tracking system relies upon phase differences for the time difference of arrival measurements of the transmitter(s). One or more transmitters send signals to multiple receivers, and the time difference of...

20060055583 - Acceleration detector with integral vehicle parameter display using a vehicle interface: Calibration of an acceleration detector is initiated by a user depressable button such as a button indicating a vehicle is at rest and/or by the detector reading an OBDII vehicle communication protocol to determine the condition of the vehicle. Calibration permits more accurate measurements in a vehicle performance test....

20060055584 - Sensor fusion for model-based detection in pipe and cable locator systems: Line locator systems that fuse traditional sensors used in a combined pipe and cable locator (electromagnetic coils, magnetometers, and ground penetrating radar antennas) with low cost inertial sensors (accelerometers, gyroscopes) in a model-based approach are presented. Such systems can utilize inexpensive MEMS sensors for inertial navigation. A pseudo-inertial frame is...

20060055585 - Radar system: There is provided a radar system for improving distance resolution while preventing generation of ghost by an object located in the outside of the effective distance for detection. In this radar system, the signal generated by a voltage-controlled oscillator is transmitted only for the predetermined period by turning ON a...

20060055586 - Secondary surveillance radar and its interrogation transmission method: An interrogation transmission method of a secondary surveillance radar compares prediction angle ranges for transmitting interrogations with a beam-width of an antenna, and transmits the interrogations at every roll-call period if the prediction angle ranges for transmitting interrogations are narrower than the beam-width of the antenna. In contrast, if the...

20060055589 - Radar apparatus: The invention is directed to reducing the number of high-frequency components in a phase monopulse radar. A received signal selected by alternately selecting two antennas by a first switch is amplified by a receiver amplifier and mixed in a mixer with a portion of a transmitter signal. Each beat signal...

20060055587 - Radar apparatus and radar signal processing method: A radar apparatus and a radar signal processing method can prevent misdetection even in the case of targets running side by side without an azimuth angle error being varied in accordance with the velocities of the targets. An antenna direction control part controls the direction of an antenna so as...

20060055588 - Radar device: A radar device includes a code generator, a transmission section, a reception section, a delay section, a despreading process section, a correlation value detection section, a target detection section, an estimation section, an acquisition section, and a correction section. The estimation section estimates a reception intensity of a reflection wave...

20060055590 - Method and device for distance measurement by pulse radar: In order to provide the method and the device for distance measurement by pulse radar that securely eliminates the false echo from the distance over the detectable limit determined by the pulse generation cycle, the pulse radar comprises the pulse signal sending unit that generates the pulse signals with different...

20060055591 - Radar level gauge with switch for selecting transmitter or receiver mode: A radar level gauge (RLG), intended for measuring with a close-range low-power radar a distance to a content surface in a container relatively to a measuring position, which is located above the surface and fixed in relation to a lower boundary of said container. The RLG comprises a transmitter for...

20060055592 - Antenna measurement systems: An antenna measurement range and a method of calibrating same is proposed which at least substantially reduces the effects of echoing or multi path. The method of calibrating the range comprises the steps of: generating and radiating a training signal; receiving the radiated training signal and comparing the received signal...

20060055593 - Radar apparatus: In a radar apparatus constructed to perform switching between a plurality of receiving antennas by using a switch, the effect of noise induced by the antenna switching is eliminated. A situation where there is no echo signal from a target is created, for example, by turning off a transmitter amplifier,...

20060055595 - Method and system for frequency drift prediction: A method (200) of frequency drift prediction for use by a positioning receiver (106) can include the steps of determining (202) a moving average of a frequency error, determining (206) a moving average of a frequency drift rate in a communication device, determining (212) a frequency drift rate uncertainty, and...

20060055596 - Satellite-based positioning system improvement: A method, device and system for determining a receiver location using weak signal satellite transmissions. The invention involves a sequence of exchanges between an aiding source and a receiver that serve to provide aiding information to the receiver so that the receiver's location may be determined in the presence of...

20060055594 - Method and apparatus for reducing gps receiver jamming during transmission in a wireless receiver: A method and apparatus for minimizing the interference between wireless transmissions and a proximately located or co-located GPS receiver is disclosed. By feedforward of a phase and amplitude adjusted version of the transmitted signal and combining said signal with the composite signal at the input of the GPS receiver, the...

20060055597 - Communication device: A communication device able to realize a positioning computation at the high speed and able to reduce electric power consumption, wherein a host CPU obtains the error value of the reference frequency of a crystal oscillator from a GPS receiver, stores that in a storage unit, transmits this value to...

20060055598 - Determining position without use of broadcast ephemeris information: Devices and methods are described for determining position information without broadcast ephemeris data for extended time periods. A server or client device receives or collects historical state data of satellites of a satellite-based positioning system and generates predictions of future satellite trajectories for future time periods. When a server generates...

20060055599 - Transmitting and receiving radio frequency signals using an active electronically scanned array: A system for transmitting and receiving signals includes an array system of one or more active electronically scanned arrays. The array system includes a receive portion of a first number of receive elements and a transmit-receive portion of a second number of transmit-receive elements. A transmit-receive element includes monolithic microwave...

20060055600 - Collision avoidance system and a method thereof: The present invention disclosed a collision avoidance system and a method thereof. The collision avoidance system is mounted onboard a host vehicle participating in a data link communication network. The system comprising: an Inertial Navigation System (INS) providing inertial motion information; a Global Positioning System (GPS) receiver providing position information...

20060049974 - Systems and methods for identifying targets among non-targets with a plurality of sensor vehicles: A plurality of sensor vehicles collect imaging data from an assigned location of a target region having targets and non-targets. The imaging data may be combined based on its location and the combined data is matched to a threat object map to identify the actual targets from the non-targets. In...

20060049976 - Distance measurement for wireless building automation devices: In a building environment, a distance associated with a building automation device is determined as a function of an inserted time delay between a wireless transmission of a signal and wireless reception of another signal. For example, a two-way communication is provided with a time delay inserted before responding to...

20060049975 - Method for determing the distance between two transmitting and receiving stations: 1. Method for determining the distance between two transmitting and receiving stations. 2.1. In automotive engineering transmitting and receiving stations are usually used in keyless locking systems as electronic key modules or evaluation units for identifying the key module. Deactivation of the locking system is prevented, if the key module...

20060049977 - Navigation system: A radar altimeter system with a closed-loop modulation for generating more accurate radar altimeter values. The present invention combines flight safety critical sensors into a common platform to permit autonomous or semi-autonomous landing, enroute navigation and complex precision approaches in all weather conditions. An Inertial Navigation System (INS) circuit board,...

20060049978 - System for enhanced detection of a target: Disclosed herein is a computer-readable medium having stored thereon computer-executable instructions for providing phase-range data associated with a return pulse of a radar device and second phase-range data associated with a successive return pulse of the radar device. The computer-executable instructions are preferably also for comparing the phase-range data and...

20060049979 - Device for transmitting and receiving radar radiation: In a device for transmitting and receiving radar radiation, at least one patch antenna is provided as transmit and receive element, which is directly connected to at least one mixing element....

20060049980 - Real-time, cross-correlating millimetre-wave imaging system: A method and apparatus are disclosed for forming an image from millimetre waves. A field of view scanned using two geometrically orthogonal, intersecting copolarized fan beams (110, 120) to receive millimetre wave radiation. The received millimetre wave radiation from said fan beams are then cross-correlated (250, 650). Also, a method...

20060049981 - Method and apparatus for processing high time-bandwidth signals using a material with inhomogeneously broadened absorption spectrum: Techniques for analog processing of high time-bandwidth-product (TBP) signals use a material with an inhomogeneously broadened absorption spectrum including multiple homogeneously broadened absorption lines. A first set of signals on optical carriers interact in the material during a time on the order of a phase coherence time of the homogeneously...

20060049983 - Method and device for determining the relative position of two points: The invention relates to a method for determining the relative position of a mobile in relation to the known position of a reference station. The relative position calculation comprises the steps of: -a) choosing a linear combination of satellite transmission frequencies L1 and L2 from a predetermined list comprising at...

20060049982 - Method of and system for reducing a time to fix in a location-enabled receiver: A location-enabled wireless device includes a wireless receiver and a positioning-signal receiver. The wireless device further includes an oscillator adapted to output a reference-frequency signal to the wireless receiver and the positioning-signal receiver and a detector adapted to output a control signal upon detection of at least one of a...

20060049984 - Beam steering apparatus: Embodiments of the invention are concerned with beam steering apparatus comprising: an antenna array having a plurality of antenna elements, the antenna elements being spatially arranged with respect to one another and being operable to receive signals; signal modulating means comprising a plurality of optical modulators, each of which is...

20060049985 - Apparatus and methods for detecting and locating signals: A discrete three-dimensional receiving element has multiple sensors scattered over its surface to detect and locate a signal. The sensors facing the signal detect the signal, and a boundary line is drawn between the sensor which detect the signal and those which don't. The strength of signal may also be...

20060044176 - Elf/vlf wave generator using a virtual vertical electric dipole: A high efficiency system generates a VED virtual antenna by taking advantage of the vertical electric field created by natural effects in the lower ionosphere at latitudes in the vicinity of the dip equator. An ionospheric heater is employed to direct a heating radiation beam into a region of the...

20060044177 - Radar system and method for determining the height of an object: System and method for determining the height of an object reflecting a real beam radar signal by receiving the reflected signal with a first and second vertically spaced antennas. Receivers provide two signals indicating the phase of the reflected signals received by the two antennas. A digital processor determines the...

20060044178 - Harmonic wireless transponder sensor and method: A method for detecting a latent environmental effect (such as a corrosive environment under insulation) or a latent structural change (such as a crack in a concealed structural member) at a known remote concealed location. The method of the instant invention includes three steps. The first step is to use...

20060044179 - Method and system for determining the position marine vessels and similar objects: A method for determining the relative position between two or more objects in a marine environment, including waterways, of which at least one object can be maneuvered relative to one or more other objects. At least one interrogator is arranged on one or more of the objects and sends a...

20060044180 - Pulse wave radar device: An in-vehicle pulse wave radar device is required to detect an object in a wide range of several tens of centimeters to several tens of meters and therefore the receiving circuit requires an amplification circuit having a wide dynamic range covering the receiving pulse waves of both a large signal...

20060044181 - Method and apparatus for measuring distance: A device (200) measures distance using a wireless signal that comprises two simultaneously transmitted components. Each of the two components comprises a respective repeated code, the two codes having different durations. On receipt of the signal, the propagation distance is calculated separately for each code and compared (280). The calculated...

20060044182 - Radar altimeter: The present invention provides a radar altimeter system with a closed loop modulation for generating more accurate radar altimeter values. The system includes an antenna, a circulator, a receiver, and a transmitter. The circulator receives or sends a radar signal from/to the antenna. The receiver receives the received radar signal...

20060044183 - Low frequency radar antenna: A radar system comprises a plurality of radiator elements arranged in a vertical array. A feed system provides signals to the array at an operating frequency. The operating frequency is less than about 600 MHz....

20060044184 - Positioning system, terminal apparatus, control program for terminal apparatus, and computer readable recording medium having recorded therein control program for terminal apparatus: A positioning system including a terminal apparatus that acquires positioning positional information from a positioning apparatus that performs positioning calculations based on position related signals from a plurality of positional information satellites, and a supplementary information providing apparatus that is capable of communicating with the terminal apparatus and provides the...

20060044185 - Antenna array calibration: A smart antenna calibration system is disclosed for calibrating an antenna array having a plurality of antennas. Each antenna has a calibration coupler for providing a monitoring signal indicative of a signal passing through a transceiver associated thereof, and a processing unit including at least one signal splitter that splits...