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7598910 |
Direction finding and mapping in multipath environments
Determining the direction of a direct arrival path between a receiver and a transmitter in a multipath environment by determining a transmitter heading relative to the receiver as proportional to a...
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7593753 |
Base station antenna system employing circular polarization and angular notch filtering
An antenna system for transferring wireless communication signals between a wireless communication device and a base station is provided. The system includes a first linear polarization antenna...
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7583855 |
Signal source data input for radio frequency planning
A method includes displaying a reference polar coordinate system on a display screen, and displaying a radiation pattern image on the display screen in juxtaposition with the displayed reference...
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7558335 |
Communication system modulating/demodulating data using antenna patterns and associated methods
A wireless communication system includes a transmitter comprising a serial-to-parallel converter for converting serial data bits to a parallel bit stream, a signal mapper coupled to the...
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7472409 |
System for access to direct broadcast satellite services
A system for receiving direct broadcast satellite signals in a mobile craft is disclosed. Generally, the system includes an orientation system for determining the first orientation of the mobile...
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7450065 |
Optimization of radar antenna switching hybrid in response to operating frequency
A radar system operates at various different frequencies, and routes power among various antennas by use of a hybrid arrangement. The system is precalibrated at each possible operating frequency by...
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7382315 |
System for and method of improving beyond line-of-sight transmissions and receptions
A radio system can be configured as a beyond line-of-sight system and includes a number of antennas, a number of phase adjusters and a transmitter/receiver unit. Each of the phase adjusters can be...
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7372402 |
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...
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7362270 |
System and method to perform network node localization training using a mobile node
A method and system for determining a location of at least one stationary node of a wireless network, which includes providing a predetermined path within a geographic space of the wireless...
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7313391 |
Modeling of RF point source reference for analysis of wireless signal propagation
A data collection and evaluation method for determination of wireless signal propagation from an incomplete set of measured data and for modeling the system as a set of RF point sources located at...
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7187324 |
Radiowave monitoring method and apparatus
Arrival directions and patterns of intensities of radiowaves are observed by a monitor station 12 a . An observed pattern given by the monitor station 12 a is compared with simulated patterns of...
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7173563 |
Calibration method, device and computer program
A method for calibrating parameters of sensor elements in a sensor array. The method comprises receiving an output signal of at least two sensor elements signal in reaction to an input signal from...
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7054663 |
Method for polar diagram shaping in a radio communications system
A method forms polar diagrams in a connection between a subscriber and a base station with an antenna arrangement in a radio communications system using multiple access methods. Antenna signals are...
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7015857 |
Calibrating an antenna by determining polarization
Calibrating an antenna includes receiving a signal sent from a reference located within a region. The signal has a polarization within an expected polarization range. Polarization value sets are...
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7006038 |
System and method for determining optimal broadcast area of an antenna
This invention is directed to a system and method for determining the broadcast coverage of an antenna without having to go through the steps of actually building the antenna. The antenna...
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6961016 |
Estimating an antenna pointing error by determining polarization
Estimating an antenna pointing error includes receiving a signal sent from a reference located within a region. A polarization ratio is evaluated over the region. A minimum polarization ratio...
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6937186 |
Main beam alignment verification for tracking antennas
A method for main beam alignment verification includes providing data pertaining to one or more patterns associated with an antenna, measuring power levels of a signal acquired by the antenna, and...
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6922169 |
Antenna, base station and power coupler
A power coupler including a differential phase shifter for differentially adjusting the relative phase between signals on a pair of signal lines; and a hybrid coupler which is coupled to the pair...
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6845244 |
Directivity control type communication apparatus and adaptive array antenna apparatus
The present invention relates to a method for adaptively controlling a transmission radiation pattern. Radio signals coming through a plurality of paths are received and demodulated for each path....
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6788661 |
Adaptive beam-time coding method and apparatus
A radio system includes a base station and a remote station. The base station includes a space-time encoder, an antenna system, a transmitter, a base station receiver, and a power management...
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6784835 |
Array antenna
An array antenna comprising a plurality of antenna elements, multipliers for multiplying coefficients with transmission or reception signal and a calculator for calculating the coefficients for...
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6778130 |
Position location method and apparatus for a mobile telecommunications system
In a cellular mobile telecommunications system the position of a mobile station can be estimated in terms of its bearing and range from a cell site. A multi-element direction finding antenna at the...
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6738016 |
Method for improving smart antenna array coverage
The invention relates to a method for improving smart antenna array coverage. Arbitrary beam forming of an antenna array can be implemented by adjusting n antenna units beam forming parameter W(n),...
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6661384 |
Mirror surface accuracy measuring device and mirror surface control system of reflector antenna
Radiation field distributions of all mirror panels composing a main reflector are measured and held in advance, radiation field distributions of a reflector antenna having the main reflector are...
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6636173 |
Calibration system and method for phased array antenna using near-field probe and focused null
A system and method for calibrating a phase array antenna using a near-field probe and focused null and a signal coherent with the beam received or transmitted at the null location of the probe. In...
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6577268 |
Outboard radio signal test system and method
The present invention provides an outboard test facility that is operable for testing a ship's direction finding antenna system in all directions as the ship circles while receiving test signals...
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6507315 |
System and method for efficiently characterizing the elements in an array antenna
A system and method to individually characterize all of the antenna elements or amplifiers in an array antenna system simultaneously, without the need to perform sequential measurements. A...
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6501965 |
Radio communication base station antenna
The base station has an antenna system comprising a housing for fixing it to a support and one or several radiating slots. It is designed for transmitting, in a first direction substantially...
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6469672 |
Method and system for time domain antenna holography
A fast, novel method is disclosed which permits to determine the electrical features of an antenna. The antenna is excited with an ultra-short voltage pulse and the far field radiation pattern of...
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6456235 |
Method of predicting the far field pattern of a slotted planar array at extreme angles using planar near field data
The far field pattern of a slotted planar array antenna is predicted at extreme angles using an improved prediction method. The prediction method acquires planar near field data for a slotted...
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6437737 |
Antenna data compression using multi-dipole antenna
Data compression method, system, and program code for compressing antenna pattern data generated by measuring the complex voltage derived from the interaction of a RF waveform and a sensing element...
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6421004 |
Mitigation of antenna test range impairments caused by presence of undesirable emitters
An antenna test range uses direct spread-spectrum based test signals to test the performance of an antenna. Since a spread spectrum waveform has high autocorrelation properties with itself and high...
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6384780 |
Extension of dynamic range of emitter and detector circuits of spread spectrum-based antenna test range
An antenna test range uses a direct spread-spectrum based test signal to effectively electronically reject all unwanted signals that may be present in the test range, and thereby allow both main...
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6295025 |
System for measuring and displaying three-dimensional characteristics of electromagnetic waves
A measurement system includes a receiver system and a display system. The receiver system receives one or more electromagnetic (EM) waves each having a carrier frequency and a rotation frequency....
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6288683 |
Antenna mirror surface measuring/adjusting device
An antenna mirror surface measuring/adjusting apparatus has a plane mirror larger than an aperture surface of said principal reflection mirror and set in parallel with the aperture surface, an...
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6285330 |
Antenna field tester
An apparatus and method for testing of rotating surface based antennas arrays (regardless of their shape), with the capability of fully diagnosing and locating a failure on the face of the antenna...
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6266528 |
Performance monitor for antenna arrays
An antenna monitor collects statistics about the received signal strengths of each antenna in a cooperating antenna array over long periods of time. In cellular telephone base station applications...
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6249248 |
Radio wave visualizing method and apparatus
An object shape distribution of an antenna intergral-type communication device to be observed with a sensor for measuring a three-dimensional shape is measured and recorded, and a scanning...
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6236839 |
Method and apparatus for calibrating a smart antenna array
A smart antenna system includes: an antenna array including a plurality of antenna elements, and at least one calibration element; a plurality of transceiver units each having a port coupled with...
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6236363 |
Smart antenna channel simulator and test system
The invention is a method and apparatus for verifying the integrity of a smart antenna system. The simulator section replicates multiple sensors with directional and non-directional components with...
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6232918 |
Antenna array calibration in wireless communication systems
A method and apparatus are provided for easily and accurately calibrating an antenna array in a multipath environment. A calibration table containing spatial signature data together with...
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6191744 |
Probe movement system for spherical near-field antenna testing
A probe movement apparatus for spherical near-field antenna testing moves a probe (22) over a spherical measurement surface or path by two bent cantilevered arms (14 and 18). A positioner (12 or...
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6181285 |
Low-distortion positioning equipment for antenna radiation pattern measurements
An antenna positioner is provided for use in an anechoic chamber to enable the radiation pattern of an antenna under test to be measured. A vertically disposed and selectively rotatable azimuth...
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6166638 |
RF/ID transponder with squinted beam radiation pattern using dipole-over-ground plane antenna
An RF/ID transponder comprises an integrated circuit package including at least a memory and an RF modulator. A dipole antenna is coupled to the RF modulator, and has a length greater than one-half...
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6140960 |
Hologram observation method for three-dimensional wave source distribution, and stereoscopic directivity estimation method of antenna and wave distribution observation method based on hologram observation
A hologram observation method capable of accurately estimating a three-dimensional wave source distribution even when a wave source is close to a hologram observation plane. The hologram...
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6084545 |
Near-field calibration system for phase-array antennas
A near-field calibration arrangement for a phased-array antenna determines the phase shifts or attenuation of the elemental control elements of the array. The calibration system includes a probe...
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6046698 |
Indoor radio frequency coverage tool
A tool for gathering empirical RF signal quality measurements that are accurately correlated with the position at which they are made is disclosed. In particular, the tool is particularly useful...
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6046697 |
Phase control of transmission antennas
A phase array antenna is monitored by applying to each element of the array in turn a signal known characteristics, detecting the signal output from the selected element as a result of the applied...
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6009335 |
Method of calibrating and testing spatial nulling antenna
A method and apparatus is provided for calibrating and detecting faults in a receiver having a multi-element antenna. The method includes the steps of selecting an antenna element of the...
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5809087 |
Coherent detection architecture for remote calibration of coherent systems
An architecture for remote calibration of coherent systems uses coherent reference and calibration signals that contain the relative amplitude and phase information desired in the calibration...
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