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8009099 |
System and methods for direction finding using a handheld device
A system for indicating the relative direction of a target object or location as determined from the current position of a wireless communication device. The system employs Direction of Arrival...
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7936852 |
Antenna diversity system for radio reception for motor vehicles
An antenna diversity system for radio reception for motor vehicles, which comprises a multi-antenna system having several antennas with antenna feed lines. There can be a diversity switching device...
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7924225 |
Direction finding antenna systems and methods for use thereof
An antenna system comprising a first antenna element, a second antenna element, and a parasitic element, wherein the parasitic element is arranged with regard to the first antenna element and the...
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7477192 |
Direction finding system and method
In a direction finding system, pluralities of signals provided by different sets of less than all of a plurality of arrayed antennas are code division multiplexed, downconverted by a single...
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7233284 |
Handheld GPS jammer locator
A handheld GPS jammer locator for locating a GPS jamming signal generated by a jammer. The handheld GPS jammer locator has two modes of operation, a amplitude mode and a difference finding mode....
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7013166 |
Multi-carrier receiver architecture
The present invention relates to a receiver device and method of receiving a radio signal, wherein radio signals are received through at least two respective different receiving paths, combined and...
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7012567 |
Approach position input device
An approach position input device includes a plurality of antennas arranged in the form of a lattice. An oscillator applies a high-frequency ac voltage to the antennas. A signal processing circuit...
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6768457 |
Diversity systems for receiving digital terrestrial and/or satellite radio signals for motor vehicles
The invention relates to a diversity reception system for motor vehicles for digitally modulated terrestrial and/or satellite radio signals in a frequency range above 1 GHz. The system includes an...
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6738609 |
Receiver and method of receiving
A receiver (9) for receiving a plurality of different signals at the same time, said receiver (9) comprising means for identifying at least one strongest signal of said plurality of different...
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5696490 |
FM (VHF) infrared wireless digital metal detector
A FM (VHF) infrared wireless digital metal detector is disclosed having a sealed aluminum radiation shield and dielectric case, with a infrared phototransistor detector and krypton bulb arranged to...
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5502449 |
Ground unit for the detection, identification, and direction determination of a marker beacon
A ground unit capable of being carried on the back of a member of the armed orces is used in conjunction with a marker beacon. The ground unit detects and identifies the signals from the marker...
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5426438 |
Method and apparatus for adaptively determining the bearing angle of a radio frequency signal
A system and method for obtaining the bearing angle of radio frequency is utilized in a direction finding system to determine the signal of interest. The system utilized an adaptive interferometric...
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5323167 |
Antenna configuration and system for determining the direction of a radio frequency signal
An antenna configuration system for determining the bearing angle of a radio frequency signal includes a plurality of loop antennas and at least one sense antenna. Through the utilization of...
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5268695 |
Differential phase measurement through antenna multiplexing
An embodiment of the present invention is a system for time multiplexing a carrier signal received by two or more GPS antennas through a single hardware path, using a single receiver's oscillator...
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5265271 |
Low battery detector
An electronic device (100) operating on a battery voltage (126) is disclosed having a regulator (108) for producing a first reference voltage (106) and a second reference voltage (110). The...
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5198823 |
Passive secondary surveillance radar using signals of remote SSR and multiple antennas switched in synchronism with rotation of SSR beam
The range from which transponder replies can be received at a virtual secondary surveillance radar of the type described in U.S. Pat. No. 4,115,771 is extended by replacing the omnidirectional...
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5010343 |
Method and device in the antenna and receiving system of a radio theodolite
Method and device in the antenna and receiving system of a radio theodolite, wherein the radio signal arriving from the transmitter of the object (31) to be measured is received by means of at...
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4978963 |
RF signal direction finding apparatus
Angle of arrival of a pulsed RF signal, such as that emitted by a radar transmitter, is determined by use of a detection circuit that contains a single RF receiver. The RF signal direction of...
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4975710 |
Methods and apparatus for direction of arrival measurement and radio navigation aids
The disclosure relates to methods, algorithms and apparatus for direction-of arrival (DOA) measurement/computation based on long-baseline, phase-difference, paired-antenna interferometry and on...
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4647935 |
Apparatus for determining the magnitude of phase discontinuities introduced into a received signal at known instants
An apparatus for tracking phase discontinuities introduced into a received signal at known instants is disclosed. The phase discontinuities are introduced into the received signal by command...
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4529986 |
Optical connection system for the bidirectional exchange of data between a central unit and peripheral units and an electronic sweep antenna comprising such a system
A system for connection by means of optical fibers for the bidirectional exchange of data between a fixed central unit and peripheral units integral with a frame driven with a rotary movement, this...
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4489327 |
Direction finding
A direction finding system has two antennas with response patterns at 90°. A sense antenna 14 is mounted to produce a sense output dependent on the received radio signal but independent of its ...
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4358768 |
Radio direction finder
A radio direction finder for obtaining the bearing of a transmitter with respect to a receiver comprises a multi-element receiving antenna, two separate scanning means coupled to said antenna for...
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4307402 |
Direction finder
A direction finder having two directive loop antennas mutually orthogonally disposed and a non-directional vertical antenna. Due to the difference in line constant between the loop antenna channels...
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4246581 |
Direction finder
An improved direction finding apparatus for determining the azimuth of a target source of radio frequency signals using in an optimal manner the signals from a central antenna and an associated...
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4220954 |
Adaptive antenna system employing FM receiver
In an adaptive antenna system, the output of the discriminator of an FM receiver is synchronously rectified, in synchronism with commutation of the input thereof between a pair of antennas, to...
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4129874 |
Antenna pattern combiner
A three input device which accepts signals from a two port antenna system having opposing cardioid patterns, and a third input for a figure eight pattern that is at right angles to the first...
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4123759 |
Phased array antenna
An antenna system for producing from a fixed array of active antenna elements which are each omnidirectional in a plane, a sensitivity pattern that is directional in said plane and which pattern...
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4107691 |
Antenna for phase front homing
A VHF radio frequency antenna for a homing receiver suited for airborne aications and comprising a pair of right angled antenna elements of like configuration terminating in a common non-conductive...
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4091386 |
Rear window direction finding antenna
A plurality of antennas attached to the glass of the rear window of a vehicle produces patterns that may be combined to give directional pick up patterns. The first basic antenna is two spaced...
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4071845 |
Harbor radio navigation system
A radio beacon navigation system wherein buoys placed at predetermined locations in a harbor or channel transmit identification signals. Every buoy is assigned a unique carrier frequency upon which...
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3872477 |
Direction finding techniques employing electronic phase modulation
Radio frequency signals received by two antennas positioned a fixed distance apart are combined into a composite electrical signal that is modulated according to the phase difference between the...
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3778834 |
DIRECTION FINDER CALIBRATION SYSTEM
An updating (calibration) system for two channel direction finders comprising two loop antennas and a reference (sense) antenna. Individual receivers connect each of the two loop antennas to...
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3761927 |
RF PHASE DETECTED INTERFEROMETER RADAR
Two elements of a duplex interferometer antenna each feed respective ports of a cross coupling network, the output of which is applied to a quadrature hybrid used as an RF phase detector. The phase...
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3725937 |
RADAR SYSTEM FOR DETERMINING THE ANGULAR DEVIATION OF A TARGET FROM A REFERENCE LINE
A radar system for determining the angular deviation of a target from a reference line. In an exemplary embodiment, an antenna arrangement is switched between at least two states which result in at...
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3495246 |
ANTENNA ENERGIZING ARRANGEMENT FOR DIRECTION FINDING UTILIZING AMPLITUDE COMPARISON
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3453589 |
APPARATUS FOR MEASURING THE DIRECTION OF INCIDENT WAVES
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3441900 |
SIGNAL DETECTION,IDENTIFICATION,AND COMMUNICATION SYSTEM PROVIDING GOOD NOISE DISCRIMINATION
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3419867 |
Automatic tracking system utilizing coded scan rate
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3419868 |
Automatic tracking system utilizing coded scan sequence
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3359557 |
Clear air turbulence advance warning and evasive course indicator using radiometer
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3229294 |
Radio location system
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3131386 |
Multiple circuit signal level monitor
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3064256 |
Radio compass
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3054370 |
Torpedo steering system
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3025517 |
Simultaneous lobe comparison for radar direction finding
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2864959 |
Target tracker
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2851684 |
Resolver for direction finders
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2850730 |
Phase comparison system
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2841788 |
Radio locating system and apparatus therefor
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