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7630738 |
Radio communication system, mobile terminal unit thereof, and azimuth determining method
Disclosed are a mobile station unit which can obtain azimuth information with a simple construction and a radio communication system including the mobile terminal unit. According to the present...
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7557747 |
Method and apparatus using fast electronic switching for multi-channelizing a single-channel radar system
According to typical practice of an inventive radar system, a switching device is capable of activating a receiver array one at a time so that when a receiver is activated the remaining receivers...
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7532154 |
Frequency modulation radar device
The frequency modulation radar device includes a transmitting unit ( 5 ), M receiving units for receiving a reflected signal as M channels, a mixing unit ( 7 ) for mixing the transmitting signal...
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H002224 |
Self-calibrating large baseline interferometer formed from two aircraft
A method to passively locate an emitter using two aircraft to form a large baseline interferometer. The basic two element (two aircraft or helicopters) large baseline interferometer includes...
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7427954 |
Method and apparatus for direction finding
A direction finding system is used in which a number of adjacent bands are sequentially measured in fast rotation, with the results from each of the bands being FFT processed to provide amplitude...
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7395084 |
Dynamic antenna allocation system
A communication system with an antenna array having a respective antenna for each of a multitude of communication modules and a control system which seiectiyely reassigns communication over a first...
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7292831 |
Radio communicate method and system
A transmitter 1 transmits from a transmission antenna 7 a mixture signal containing a radio-frequency (RF)-band modulated signal, and a portion of power of a local oscillation signal used for...
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7277046 |
Single transmit multi-receiver modulation radar, multi-modulation receiver and method
A single transmit multi-receiver modulation radar modulates radar return signals received through an associated receive-signal path with one of a plurality of differing modulation waveforms having...
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7213442 |
Methods of arranging transducers and transducer arrays having reduced phase ambiguity for determining direction of arrival of received signals
Method of arranging transducers, including non-coplanar interferometer antennas on the outer surface of an aircraft, to minimize phase ambiguities when determining the direction of arrival of a...
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7130243 |
Location finding system, using reflected radio frequency or acoustic signals in a crowded reflector environment
A method of locating one or more reflectors in an environment crowded with reflectors. A transmitter and multiple receivers are used to obtain reflected signals. Each path of a reflected signal is...
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6996420 |
Radio communication system, mobile terminal unit thereof, and azimuth determining method
Disclosed are a mobile station unit which can obtain azimuth information with a simple construction and a radio communication system including the mobile terminal unit. According to the present...
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6989789 |
Method for locating radioelectric sources using two-channel high resolution radiogoniometer
A process for locating radio sources by a two-channel high resolution radiogoniometer including a network of a specified number N of sensors. The process multiplexes the signals supplied by the N...
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H002109 |
Passive microwave direction finding with monobit fourier transformation receiver and matrix coupled antenna
A passive instantaneous microwave signal frequency identifying and angle of arrival identifying system employing a beam steering multiple element antenna coupled through a Butler matrix to a...
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6735524 |
Spatially resolved and spatially aware antenna for radio navigation
A method and apparatus for radio navigation and location is disclosed. The method uses an autonomous, on-board micro-inertial navigation system to propagate the state of a station, and an angularly...
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6727840 |
Interference suppression circuit and method thereof for multi-channel receivers
The Electronic Support Measure (ESM) system is disclosed having various embodiments all of which reduce or even eliminate the detrimental effects caused by interference signals commonly generated...
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6700536 |
System and method for determining a direction of incident electromagnetic signals
A system and method are provided that includes at least a pair of spaced antennas having overlapping fields of view. The system further includes at least a pair of receivers respectively coupled to...
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6690321 |
Multi-sensor target counting and localization system
A system is provided for detecting the presence of two or more acoustic sources or targets such as vehicles that are traveling between an array of unattended passive ground sensors, in which the...
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6677893 |
Method and apparatus for locating the source of unknown signal
A method of locating the source of an unknown signal of varying frequency received by receive antennas ( 16, 18 ) via relay satellites ( 12, 14 ) involves downconversion of received signals to a...
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6670920 |
System and method for single platform, synthetic aperture geo-location of emitters
The determination of the geographical location of a signal emitter by the coherent, time integrated measurement of received signal wavefront phase differences through a synthetic aperture and the...
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6639553 |
Passive/ranging/tracking processing method for collision avoidance guidance
A passive/ranging/tracking processing method provides information from passive sensors and associated tracking control devices and GPS/IMU integrated navigation system, so as to produce three...
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6618009 |
Method and apparatus for locating the source of an unknown signal
A method of determining the location of an unknown source 10 transmitting a signal to satellite relays 14 and 16 comprises receiving replicas of the signal from the relays at receivers 18 ....
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6388604 |
Circuit for LPI signal detection and suppression of conventional pulsed signals
A pulse Low Probability of Intercept (LPI) signal discriminator has a soft-limiting IF amplifier chain for receiving an IF signal to soft-limit any high-peak IF signals in the IF signal and a...
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6366240 |
Location of aircraft with time difference of arrival
A system and method for determining the position of an aircraft. An aircraft signal is received by a first antenna and a second antenna, the first antenna being at a known baseline distance from...
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6313781 |
Simultaneous intrapulse analysis, direction finding and LPI signal detection
The present invention relates to multi-function, multi-channel digital receiver architecture for performing three distinct receiver functions including simultaneous intrapulse analysis, direction...
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6313794 |
Method of detection and determining an angular location of frequency agile emitters
The present invention uses feedback 300 from RF carrier frequency measurements 301 to disassociate the emitter angle-of-arrival component 313 in the ambiguous phase measurement 312 from the...
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6278406 |
Direction finder and device for processing measurement results for the same
A direction finder is provided that can measure the incoming angles of plural incoming signals without spatially moving antenna elements and can be used in outdoor mobile communication...
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6255991 |
Low cost angle of arrival measurement system
An interferometer antenna system (32) for measuring the angle of arrival of RF signals. The interferometer antenna system (32) includes a plurality of interferometer antenna elements (36) coupled...
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6239747 |
Antenna system and method for direction finding
An array antenna for direction-finding includes antenna elements which define a triangular outline well-suited for meeting space constraints or reducing reflections from mounting conditions...
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6223123 |
Method and apparatus for direction finding
Two pairs of signals determinative of bearing to a transmitter are developed from two pairs of directional antennas. The signals, converted to digital form, are compared to each other to develop a...
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6169519 |
TCAS bearing measurement receiver apparatus with phase error compensation method
A TCAS receiver, including a relative bearing measurement radio receiving apparatus for use with an antenna array having four antennas where each antenna has associated with it, its own receiver...
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6025814 |
Antenna unit for the doppler measurement of grain flow
An antenna unit for measuring the velocity of a flowing material by the Doppler effect is particularly suited for use where only a limited space is available. The antenna unit comprises a support...
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6018312 |
Locating the source of an unknown signal
A method of determining the location of an unknown source (10) transmitting an unknown signal to satellite relays (14 and 16) comprises receiving the signal from the relays at respective receivers...
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5990833 |
System for direction determination
System for determining the position of radar transmitters where the system includes at least one information center with associated cells and means of communication between the information center...
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5969676 |
Radio frequency interferometer and laser rangefinder/destination base targeting system
A dual radio frequency interferometer aided by laser rangefinder and terrain database system utilizes two linear rays of RFI sensors to determine the position of a source of RF energy. The dual RFI...
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5877722 |
Search method for detection and tracking of targets using multiple angle-only sensors
A method of detection and tracking of targets using multiple angle-only sensors is disclosed. The method is computationally efficient and is capable of detecting and tracking multiple targets in...
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5835060 |
Self-resolving LBI triangulation
In a long base line interferometer system for determining the position of a transmitter, the phase differences between the signal received by the antennas at each end of the base line are monitored...
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5805200 |
System for determining position from pseudorandomly modulated radio signals
This invention provides a method and apparatus for determining position from code modulated, suppressed carrier signals received from satellites, in which a digital composite of the signals...
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5745071 |
Method and apparatus for precisely locating a resonant object
The method and apparatus precisely identifies and locates an object which resonates in response to signals of at least one and, more typically, two resonant frequencies. The locating apparatus...
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5570099 |
TDOA/FDOA technique for locating a transmitter
A process for locating a transmitter in which the signal is received by first and second receivers and then processed by respective analog to digital converters and filtered to yield first and...
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5493308 |
Close range fault tolerant noncontacting position sensor
A method and system for locating the three dimensional coordinates of a moving or stationary object in real time. The three dimensional coordinates of an object in half space or full space are...
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5355141 |
Channelized bearing processor
A channelised bearing processor comprises a channelised receiver consisting of a plurality of i.f. receivers (34 to 42) covering contiguous parts of a predetermined frequency range. Each of the...
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5315307 |
Doppler frequency angle measurement technique
The technique allows precise angle-of-arrival (AOA) and radio frequency measurements on non-cooperative radar signals, by exploiting precise phase measurement capabilities of frequency measurement...
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5160934 |
Cross-switched MICRAD seeker
A MICrowave RADiometric (MICRAD) guidance system is disclosed which utilizes an antenna having four beams, designated right, left, up and down. Information from the four beams is monitored...
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5122808 |
Phase only bearing mesurement with amiguity correction in a collision avoidance system
A receiver system for measuring the bearing of a target having ambiguity correction. The receiver system includes a four element antenna array, three receivers and two phase detectors. The system...
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5075696 |
Direction finding apparatus
Direction finding apparatus comprising at least ten antenna channels for connection to respective antennae in use, at least five receiver channels each coupled to at least two different antenna...
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5073784 |
Transmitter location system for frequencies below HF
Differential phase measurement techniques and apparatus for accurately loing unknown transmitters over great distances at radio frequencies below HF. A network of separated, time- and...
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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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4922257 |
Conformal array antenna
A conformal array antenna system is disclosed comprising a structural base body having a shape suitable for a surface of an airplane or a ship, and a plurality of antenna units disposed on the...
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4818998 |
Method of and system and apparatus for locating and/or tracking stolen or missing vehicles and the like
An improved vehicle or other object-tracking and location system, preferably, though not essentially, of national scope, wherein transponder or transceiver-equipped stolen or missing vehicles or...
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4754281 |
Direction finder operating according to the Watson-Watt principle
In a direction finder operating according to the Watson-Watt principle and having two separate receivers (3, 4) of the same type and of simple construction for the signals of the two crossed...
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