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7414582 Method and apparatus for all-polarization direction finding  
Embodiments of the present invention provide a method and apparatus for all-polarization direction finding. The method and apparatus generally include acquiring measurements at least partially...
7412175 Interferometric polarization control  
A signal conditioning module provides a polarimeter capability in a photometric system. The module may include multiple variable delay polarization modulators. Each modulator may include an input...
7402794 Radiometer imaging system and method thereof  
A radiometer imaging system includes an antenna array having a plurality of sub-arrays, each being formed of a plurality of antenna elements arranged in a sub-Y-type, a receiver array having the...
7380455 System and method for resolving phase ambiguity of a transducer array to determine direction of arrival of received signals  
System and method for resolving phase ambiguities of various transducer arrays, including non-coplanar interferometer antennas on an aircraft skin, in order to determine the direction of arrival of...
7262729 Radio detection and ranging intrusion detection system  
A radar system having a processor, a waveform generator, a plurality of antenna interfaces, a set of first antennas configured to transmit a waveform, and a set of second antennas configured to...
7251286 Method and apparatus for space division multiple access receiver  
Methods and systems consistent with this invention receive a plurality of transmitted signals in a receiver having a plurality of receive elements, wherein each transmitted signal has a different...
7242350 Estimating an angle-of-arrival of a signal by determining polarization  
Estimating an angle-of-arrival of a signal includes receiving a signal sent from an emitter. The signal is received at a singly polarized antenna system associated with an antenna response model....
7239275 Methods and systems for tracking signals with diverse polarization properties  
Methods and systems for tracking signals with diverse polarization properties address both sensitivity and antenna tracking performance issues. In one embodiment, complex weightings for matching a...
7201054 System and method for resolving phase ambiguity of a transducer array to determine direction of arrival of received signals  
System and method for resolving phase ambiguities of various transducer arrays, including non-coplanar interferometer antennas on an aircraft skin, in order to determine the direction of arrival of...
7123941 Radio LAN master station system  
A radio LAN master station system which provides long distance communication and suffers from small interference by another system located inside and/or outside of a service area comprises a...
7113748 System and method for improving polarization matching on a cellular communication forward link  
The present invention provides a method of controlling a plurality of beam patterns radiated by a base station in a wireless communication system. The method includes receiving at least one signal...
7082155 Reception level measuring system  
A reception level measuring system in which a base station in a code division multiple access (CDMA) mobile communication system measures a reception level of a signal from a mobile station. The...
6861983 Method and apparatus for reducing electromagnetic interference and jamming in GPS equipment operating in rolling environments  
A method and apparatus for reducing electromagnetic interference (EMI) and jamming in Global Positioning System (GPS) receivers operating on rolling or spinning platforms and/or environments is...
6861942 Directionally-adjustable antenna system using an outside mirror for automotive applications  
A vehicle antenna system incorporated into at least one side-view mirror of a vehicle includes a forward directed antenna and a rearward directed antenna to transmit and receive signals over...
6832071 Satellite broadcast reception system capable of connection with plurality of satellite receivers  
An LNB (low noise block down converter) that can have a plurality of receivers connected includes a conversion unit receiving a plurality of types of polarized wave signals transmitted from each of...
6823021 Method and apparatus for space division multiple access receiver  
Methods and systems consistent with this invention receive a plurality of transmitted signals in a receiver having a plurality of receive elements, wherein each transmitted signal has a different...
6763223 Low noise converting apparatus  
A reception signal of a horizontally polarized wave and a reception signal of a vertically polarized wave from one satellite are amplified by a first pair of low noise amplifiers, and a reception...
6608590 Alignment of antenna polarization axes  
A method for aligning an antenna polarization axes of a dual polarized end-user terminal having an antenna. The antenna is aligned with a satellite in relation to azimuth and elevation. The...
6593876 Adaptive microwave antenna array  
An antenna array of “n” individual parabolic dishes is arranged about a center in subarrays extending in North, East, South and West rows. Signals received by the antennas are combined into...
6580391 Antenna alignment system and method  
An antenna alignment apparatus and alignment method is used to effectively position an antenna used in a satellite communication system on the satellite orbital arc, and to ensure that a proper...
6529158 Aperture synthesis radiometer and method of controlling same  
An aperture synthesis radiometer operating in fully polarimetric mode. The measuring receivers are connected selectively to the polarization ports of the array elements following selected switching...
6504504 Antenna system for receiving signals that are transmitted by geostationary satellite  
The antenna system comprises a reflector which can be motionless, a source device and a device for treating the signals received by the source device. The system comprises means for automatically...
6426684 Point detect filter  
An electronic warfare system for detecting missiles which appear as points in an IR image. The system includes a point detect filter with two stages. The first stage produces a characteristic...
6400316 Radiation receiving apparatus  
A microwave receiving antenna system ( 30 ) is described which is used to determine an originating direction of microwave radiation. The system has a birefringement phase plate ( 34 ) which splits...
6388610 Antijam null steering conformal cylindrical antenna system  
An antijam null steering conformal cylindrical antenna system includes a cylindrical array of linearly polarized individually weighted antenna elements; a plurality of weighting circuits one...
6373435 Radio direction and position finding apparatus  
An object of the present invention is to provide a selective level measuring apparatus with wider dynamic range of effective value detection, compared with the range by a conventional one. The...
6351237 Polarization and angular diversity among antenna beams  
A receiving system 100 is disclosed which includes at least one antenna 101 providing a plurality of antenna beams providing signal diversity between communicated signals. A first processing...
6304214 Antenna array system having coherent and noncoherent reception characteristics  
An antenna array system includes a first array for operating in a transmit mode and a receive mode and a second array spaced apart for operating in the receive mode. A receiver adjusts a receive...
6208295 Method for processing radio signals that are subject to unwanted change during propagation  
A method for processing received radio signals that are subject to unwanted change during propagation through the atmosphere, from a transmitter to a receiver array. The multiple signals are...
6195043 AOA estimation and polarization induced phase correction using a conformal array of titled antenna elements  
An apparatus and method for determining the angles-of-arrival and the polarization states of incoming RF signals of unknown polarization using five or more RF sensing antenna elements of differing...
6175327 GPS receivers with adaptive antenna systems for suppressing interference signals  
GPS receivers are provided that reduce all types of interference signals with a simple receiver structure that includes an antenna system having a reference antenna element and a plurality of...
6140963 Ambiguity removal and angles-of-arrival estimation for radially polarized conformal arrays  
A method for resolving the angular ambiguity inherent in the differential phase measurements of a source of electromagnetic signal by an interferometric system of antenna elements. Three or more...
6107962 Method for measuring the ellipse axes, wave direction, and wave propagation mode of an elliptically, circularly, or linearly polarized wave  
This invention consists of a method for measuring the direction and magnitude of the semi-major and semi-minor axes (13, 14) of the electric ellipse (5) of an incoming wave in a magnetized plasma...
6094165 Combined multi-beam and sector coverage antenna array  
A beam forming apparatus and method for forming a plurality of directional beams within a sector, as well as a full sector coverage beam is disclosed, wherein uplink reception diversity is...
6020848 Monolithic microwave integrated circuits for use in low-cost dual polarization phased-array antennas  
The present invention provides a new architecture for MMIC circuitry that allows reception of electronically selectable single polarity or simultaneous dual polarity/dual beam signals by...
5974178 Wavesource image visualization method using a partial division fast fourier transform  
The reconstruction region of a hologram reconstructed image is segmented. A fast Fourier transform (FFT) is carried out after multiplying the hologram measurement data V(R) by a weighting function....
5950124 Cellular communication system with dynamically modified data transmission parameters  
An apparatus and process for improving the performance of a cellular communication system using direct sequence spread spectrum techniques. The apparatus and process enable dynamic modification of...
5936575 Apparatus and method for determining angles-of-arrival and polarization of incoming RF signals  
An apparatus and method for determining the angles-of-arrival and the polarization states of incoming RF signals of unknown polarization using three or more RF sensing antenna elements of differing...
5872540 Digital interference suppression system for radio frequency interference cancellation  
A digital signal processing system that produces an adaptive cancellation arrangement which nulls out all types of concurrent interference and/or jamming signals received by a Global Positioning...
5838740 Crosspole interference canceling receiver for signals with unrelated baud rates  
Crosspolarized signals of unrelated baud rates transmitted through a communication channel (10) become depolarized due to channel distortions such as rain and antenna imperfections. The resulting...
5815113 Monolithic, low-noise, synchronous direct detection receiver for passive microwave/millimeter-wave radiometric imaging systems  
A direct detection receiver for a passive microwave and millimeter wave radiometric imaging system. The receiver includes a balanced switch low-noise amplifier (BSLNA). A front-end, low-noise...
5760740 Apparatus and method for electronic polarization correction  
Disclosed is a cross-polarization cancellation apparatus and method particularly useful in a frequency reuse system, including a dual-polarized receiving system that receives a first...
5752180 Converter for processing RF signals having different polarizations  
A radio frequency converter includes a plurality of signal paths for simultaneously processing two RF signals in the same band but with different polarizations, each of which includes a mixer and...
5712641 Interference cancellation system for global positioning satellite receivers  
An adaptive polarization cancellation arrangement which nulls out all types of concurrent interference signals received by a Global Positioning System (GPS) receiver from antenna mainlobe and...
5691727 Adaptive polarization diversity system  
An adaptive polarization diversity system for radio link communication. The system includes a base station antenna for transmitting either a clockwise polarized transmission or a counterclockwise...
5608411 Apparatus for measuring a spatial angle to an emitter using squinted antennas  
An apparatus for determining a spatial angular reference to an emitter of RF signals, such as direction of arrival or angle of arrival, from phase measurements made between two antennas is...
5552788 Antenna arrangement and aircraft collision avoidance system  
An antenna arrangement on a host aircraft for generating power signals related to a direction from which a transponder reply signal is received from a threat aircraft. The arrangement includes...
5432522 Cross polarization interference compensating device comprising decision feedback cross polarization interference cancellers  
On receiving a symbol sequence carried by a first-polarization and a second-polarization signal of two orthogonally polarized signals and in order to cancel a cross polarization interference (XPI)...
5345591 Receiving satellite switching apparatus  
When a satellite among a plurality thereof is designated as well as a polarized signal to be received from this satellite in a receiving satellite switching apparatus, a voltage changeover unit...
5327093 Method and system for synchronizing mutually interfering signals in digital radio transmissions with frequency re-use  
The present invention concerns a method and a system for demodulating mutually interfering signals according to a suitable synchronism bond between said signals. With such a system a complete...
Matches 1 - 50 out of 121 1 2 3 >