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7509217 Vehicle detector and vehicle detecting method  
A vehicle detector includes a detecting apparatus and a determining apparatus. If a plurality of detection points detected by the detecting apparatus forms a group of detection points, the...
7504992 Wireless system using continuous wave phase measurement for high-precision distance measurement  
A system and method for monitoring topological changes in a defined area. A grid of sensors is arranged in the area, with known distances between them. The sensors communicate wirelessly with a...
7501978 Short-distance ranging system  
A system for ascertaining the range from an interrogator to one or more transponders comprises an interrogator that transmits an RF carrier that is received by each transponder, the energy in the...
7486226 Device and a method for accurate radar level gauging  
The invention relates to a system, device, and method for using radar signals to measure the distance (h) to a surface from said device, the device comprising a transmitter and a transmitting...
7479884 System and method for monitoring objects, people, animals or places  
An improved system and method for monitoring objects, people, animals, or places uses a passive Modulating Reflector (MR) tag where an antenna is alternately short and open circuited according to...
7460059 Removing interfering clutter associated with radar pulses that an airborne radar receives from a radar transponder  
Interfering clutter in radar pulses received by an airborne radar system from a radar transponder can be suppressed by developing a representation of the incoming echo-voltage time-series that...
7447480 Wireless, especially mobile, communication device for communicating with communication devices in vehicles  
A wireless, in particular mobile, communication device (8) for communicating with communication units (9) in vehicles (5, 6, 7), comprising a transmitter (26) and a receiver (29) for...
7436350 Combined aircraft TCAS/transponder with common antenna system  
The present invention is a combined aircraft TCAS/Transponder with common antenna system and transmitter. Common TCAS/Transponder multi-monopole top and bottom antennas may be connected to a top...
7372398 Electronic target position control at millimeter wave for hardware-in-the-loop applications  
An apparatus for use in controlling a simulated target position in a millimeter wave, hardware-in-the-loop system includes a pair of horns and a conditioning circuit. The conditioning circuit is...
7323977 Tunable RFID tag for global applications  
An RF transponder comprises a transponder integrated circuit, an antenna connected to the transponder integrated circuit, and at least one parasitic element adapted to interact electrically with...
7292822 Wireless communication system using surface acoustic wave (SAW) second harmonic techniques  
An IDT produces a SAW when excited by a single electrical pulse and can be fabricated to embody a code, which code provides for a passive autocorrelation of a SAW input to the IDT and thereby...
7239264 Radar transponder  
Transponders, receivers and position determining systems are described. In one embodiment, a transponder includes (i) an on-board receiver and associated receiving antenna for receiving incoming...
7221308 Joint stars embedded data link  
A system comprises a radar for producing a radar interrogation signal, a transponder for receiving the radar interrogation signal and producing a transponder signal including a first linear...
7209071 System and method for distance measurement  
A system and method for performing distance measurement using wireless signals. A time of flight calculation is enabled by an interrogating device that transmits an interrogation signal to a...
7196654 Vehicle positioning and tracking radar system  
A vehicle positioning and tracking radar system includes a rotating antenna with a pair of spatially separated transmit feeds for simultaneously transmitting a pair of frequency-modulated...
7164380 Interrogator and goods management system adopting the same  
An interrogator with an antenna that allows information exchanges with multiple transponders in a shorter distance of communication, by securing an intensified and uniform electromagnetic energy...
7164886 Bluetooth transparent bridge  
System and method for transparently attaching wireless peripherals to a computer using a Bluetooth wireless network. A preferred embodiment comprises an interface (for example, interface 630), a...
7158763 Multi-IDT SAW hybrid communication system  
A SAW communication device has a main IDT mounted on an SAW substrate to receive an RF signal received by an antenna and convert the RF signal to an acoustic wave which travels along the SAW...
7106245 Digital RF tag  
An RF tag is provided to communicate with an interrogating source in which the tag has programmability and flexibility to uplink data to multiple platforms. As such the RF tag functions as a...
7106246 Oscillator coupled to an antenna and an application  
A radio frequency device has an antenna for capturing an incoming signal for processing by the device or for radiating an outgoing signal from the device and a signal processor having one or more...
7053524 Surface acoustic wave sensor or identification device with biosensing capability  
A surface acoustic wave sensor or identification device has a piezoelectric material, and an interdigitated transducer (IDT) input/output mounted on the piezoelectric material for receiving a...
7046186 Friend/foe identification system for a battlefield  
The invention relates to an IFF apparatus for ground applications, which comprises: (a) an encoder for forming an interrogating or response sequence of pulses, and conveying the same to a UWB...
7042388 Beacon-on-demand radar transponder  
A radar transponder is provided that synchronizes the encoding of repeated radar pulses using an envelope detector to detect the envelope of received radar pulse signals. An edge detector detects...
7034741 Apparatus for detecting position information of a moving object  
An apparatus for detecting position information of a moving object. The apparatus includes a transponder, a communication module, and a reader. The transponder is installed on a predetermined...
7035322 Wireless digital data transmission from a passive transceiver  
A wireless network transmits digital data. The network includes an active transceiver to transmit carrier waves at a succession of preselected frequencies and a transponder. The transponder...
7030805 Methods and system suppressing clutter in a gain-block, radar-responsive tag system  
Methods and systems reduce clutter interference in a radar-responsive tag system. A radar transmits a series of linear-frequency-modulated pulses and receives echo pulses from nearby terrain and...
7023342 Continuous wave (CW)—fixed multiple frequency triggered, radio frequency identification (RFID) tag and system and method employing same  
A far field radio frequency identification (RFID) tagging and tracking system employing a plurality of continuous wave (CW), unmodulated signals selected from frequencies including a predetermined...
7023323 Frequency hopping spread spectrum passive acoustic wave identification device  
A system and method for interrogating a passive acoustic transponder, producing a transponder signal having characteristic set of signal perturbations in response to an interrogation signal,...
7015856 Device and method for SPR detection in a Mode-S transponder  
A Mode-S transponder is provided for detecting synchronization phase reversal (SPR) signals. The transponder includes a receiver for receiving a Mode-S signal that contains a P6 pulse having a...
7009553 Device and method for alert and density altitude features in a transponder  
A transponder having a subsystem for providing an altitude alert function signifying a deviation from a set altitude is described. The subsystem includes an input for receiving an altitude...
7005964 Dual track surface acoustic wave RFID/sensor  
A SAW RFID tag or sensor has an antenna for receiving and propagating an RF signal, an input/output IDT electrically connected to the antenna, and a dual track reflective IDT having a first track...
6967428 Selectable reflector arrays for SAW sensors and identification devices  
A surface acoustic wave sensor or identification device has a piezoelectric substrate, an interdigitated transducer (IDT) input/output mounted on a substrate for receiving a radio frequency (RF)...
6946989 Transponder, including transponder system  
In a transponder (19) for amplification of a received signal (60) into an antenna (1), to a signal (61) for retransmission, and where the retransmitted signal (61) possibly may have information...
6946952 Data carrier for transmitting data with different transmission parameters  
A data carrier (1) for contactless communication with the communication station comprises firstly a reception stage (3) for receiving an interrogation signal (IS), secondly a generation stage (17)...
6943725 Access control system with limited evaluation of code and distance information  
An access control system for an object, particularly a motor vehicle, comprises at least one base station with a transceiver device that transmits a wideband modulated interrogation signal, at...
6907090 Method and apparatus to recover data from pulses  
Methods and corresponding apparatus to recover data from a signal comprising groups of pulses generated in response to analog waveforms are described. Data recovery in accordance with the...
6876296 Smart license tag system  
A system for providing the identification and tracking of motor vehicles that includes a probe device that transmits a radio frequency modulated signal to a transponder unit that is located within...
6870461 Integrated receiving/backscattering arrangement for contactless data transmission  
A receiving/backscattering arrangement for carrying out a contactless data transmission includes an integrated circuit having two antenna contacts, a series arrangement of three high quality...
6861971 Transponder having high phase stability, particularly for synthetic aperture radar, or sar, systems  
A transceiver or transponder particularly for synthetic aperture radar, or SAR, systems, operating in a frequency band having a central frequency, the transponder comprising a receiver (1) and a...
6838989 RFID transponder having active backscatter amplifier for re-transmitting a received signal  
An RFID transponder is provided with an active backscatter amplifier that amplifies and re-transmits a received signal. The RFID transponder comprises an antenna and a circulator having a first...
6825795 Transponder lock  
A transponder lock provides allows an aircraft transponder to continue transmitting an alerting code for the duration of an emergency. The transponder lock thereby enables the aircraft transponder...
6784787 Identification system  
A method and system for identifying a plurality of transponders in an interrogation involves transmitting an interrogation signal to the transponders and receiving, at a reader, response signals...
6779091 Contactless integrated circuit comprising a wired logic anticollision circuit  
An integrated circuit having an identification code of M bits includes a communication interface circuit for receiving a selective identification request and a selection code, and a processing...
6745008 Multi-frequency communication system and method  
A multi-frequency RFID remote communication system is provided that includes a plurality of RFID tags configured to receive a first signal and to return a second signal, the second signal having a...
6727842 Digital IF processor  
Apparatus for processing a signal of a predetermined intermediate frequency (IF) to generate in-phase (I) and quadrature (Q) components thereof comprises: an analog-to digital converter circuit...
6690264 Selective cloaking circuit for use in a radiofrequency identification and method of cloaking RFID tags  
The output to the antenna of an RFID tag or label is disconnected from the balance of the RFID chip by means of a series switch activated in response to a logic command, CLOAK, generated by the...
6677888 Secure aircraft communications addressing and reporting system (ACARS)  
A method and apparatus that permit military aircraft operators to use the civilian Aircraft Addressing and Reporting System (ACARS) technology while ensuring data security.
6674359 Method of identifying several transponders  
Transponders present in an interrogation zone can be identified by an interrogator by it sending an RF interrogation signal into the interrogation zone, the RF interrogation signal containing a...
6664916 System and method for identifying navigational markers using radar  
A system containing a navigational marker, the navigational marker having the ability to reflect radar in such a manner that the navigational marker is identified. In one embodiment, a polarized...
6657580 Transponders  
A transponder comprises a retro-reflective antenna array in which the length of the transmission lines is given by I=±A nλ where: A is an arbitrary length; n is zero, or an integer, λ is the...