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| Number | Title | Issue Date |
| 6140954 | Radar device A radar device for detecting distances and relative speeds of obstructions such as preceding vehicles has a stationary object identifier for identifying stationary objects such as roadside guard rails and the like and a stationary object eliminator for el... | 10/31/2000 |
| 6127965 | Method and apparatus for rejecting rain clutter in a radar system A method and apparatus for detecting the presence of objects in a vehicle operator's blind spots. The apparatus comprises a side-facing Doppler radar system using continuous wave (CW) transmission with frequency modulation (FM) operation from a frequency ... | 10/03/2000 |
| 6109526 | Optical and passive electromagnetic reader for reading machine-readable symbols, such as bar codes, and reading wireless tags, such as radio frequency tags, and corresponding method A document or object includes resonant tags, such as thin dipoles, and a machine-readable symbol, such as an area symbol, secured thereto. A reader reads the symbol and determines response characteristics encoded therein for the dipoles. The reader then c... | 08/29/2000 |
| 6087972 | Microwave sensor for object motion detection A microwave sensor for determining the velocity and direction of a moving object comprises a mixer, phase shifter, and receive/transmit antenna mounted in series, the mixer having a single intermediate frequency output. The intermediate frequency output i... | 07/11/2000 |
| 6087976 | Radar object detection system having normalized range sensitivity An improved obstacle detection radar system and method of operation in which the detection sensitivity is normalized with respect to target range without significantly increasing system complexity or cost, while at same time improving the system response ... | 07/11/2000 |
| 6075479 | Radar apparatus installed on vehicle for producing correct detecting result A radar apparatus installed on a vehicle includes a transmission section and a reception section. The transmission section has at least a transmission antenna, and emits a transmission wave toward a detection area in a front of the vehicle. The transmissi... | 06/13/2000 |
| 6061015 | Vehicle obstacle detecting system A vehicle obstacle detecting system having a combination of different kinds of detectors, such as a laser radar and a millimeter-waver radar, to detect an obstacle present ahead of the course of vehicle travel. The system determines whether the detection ... | 05/09/2000 |
| 6057797 | Radar sensor for use in motor vehicles In order to make the connecting lines from at least one transmitting antenna element and at least one receiving antenna element to a common oscillator as short as possible, the receiving antenna element is arranged outside the radiation pattern of the tra... | 05/02/2000 |
| 6054925 | High impedance transponder with improved backscatter modulator for electronic identification system A transponder 20 for an electronic identification system transponder is characterized in that it presents a high input impedance (>400Ω) at an input thereof which is directly connected to an antenna 22 with a matched high input impedance. The transponder... | 04/25/2000 |
| 6031482 | Method and system for sensing and locating a person, e.g. under an avalanche An electromagnetic method for detecting and/or locating a person constituting a non-cooperative target, in which an electromagnetic signal is transmitted (1) in the vicinity of a search zone (N), and the signal returned by said zone (N) is detected (2) in... | 02/29/2000 |
| 6025797 | Angular shift determining apparatus for determining angular shift of central axis of radar used in automotive obstacle detection system An angular shift determining apparatus is provided which may be employed in an automotive obstacle detection system designed to determine a distance to and angular direction of a target tracked by a radar. The angular shift determining apparatus determine... | 02/15/2000 |
| 6002357 | System for and method of determining the location of an object in a medium The depth of a metal object (for example) beneath the ground (for example) is measured by measuring propagation times of electromagnetic radiation travelling in two different paths within the ground, each from a transmission location via reflection from t... | 12/14/1999 |
| 5969663 | Time domain radio transmission system A time domain communications system wherein a broadband of time-spaced signals, essentially monocycle-like signals, are derived from applying stepped-in-amplitude signals to a broadband antenna, in this case, a reverse bicone antenna. When received, the t... | 10/19/1999 |
| 5966090 | Differential pulse radar motion sensor A pulse Doppler radar motion sensor system and method for sensing target motion within a gated region is provided with approximately constant response versus target distance. The sensor includes a transmitter for transmitting a sequence of RF bursts compr... | 10/12/1999 |
| 5952956 | Time domain radio transmission system A time domain communications system wherein a broadband of time-spaced signals, essentially monocycle-like signals, are derived from applying stepped-in-amplitude signals to a broadband antenna, in this case, a reverse bicone antenna. When received, the t... | 09/14/1999 |
| 5912639 | Ground penetrating radar with synthesized end-fire array In a ground penetrating radar system, A-scan images of subsurface targets lying along the antenna boresight axis can be substantially improved and generated in real-time by employing a synthetic aperture, end-fire array, despite the inhomogeneous nature o... | 06/15/1999 |
| 5886661 | Submerged object detection and classification system A detection and classification system for underwater objects uses a transting unit and a receiving unit. The transmitting unit comprises a waveform generator, a power amplifier, and a transmitting antenna. The receiving unit comprises a receiving antenna... | 03/23/1999 |
| 5812081 | Time domain radio transmission system A time domain communications system wherein a broadband of time-spaced signals, essentially monocycle-like signals, are derived from applying stepped-in-amplitude signals to a broadband antenna, in this case, a reverse bicone antenna. When received, the t... | 09/22/1998 |
| 5793309 | Short range electromagnetic proximity detection A very low-cost, short-range electromagnetic transceiver uses a low frequency oscillator signal as a means of charging a step recovery diode (SRD) which converts the stored charge into a very short impulse to enable very high energy efficiency frequency m... | 08/11/1998 |
| 5786760 | Alarm system with variable warning signal An alarm system and method for detecting an intruder and making an impression on the intruder. The system operates by detecting a presence of the intruder, determining a location of the intruder, outputting a warning signal for perception by the intruder,... | 07/28/1998 |
| 5760687 | Method of and device for detecting the presence of a living being of a particular species in a space monitored by a doppler sensor The signal delivered by a Doppler sensor is treated after amplification, filtering and digitization by: means for determining the global energy of the digitized signal; autocorrelation test means for showing up a dominant frequency; a filter for rejecting... | 06/02/1998 |
| 5682164 | Pulse homodyne field disturbance sensor A field disturbance sensor operates with relatively low power, provides an adjustable operating range, is not hypersensitive at close range, allows co-location of multiple sensors, and is inexpensive to manufacture. The sensor includes a transmitter that ... | 10/28/1997 |
| 5600253 | Electromagnetic wave reflective type, low cost, active proximity sensor for harsh environments A low power, low cost, millimeter wave (MMW) proximity sensor that provides over a 6:1 increase in minimum detection range (55 mm minimum) compared to standard 18 mm inductive proximity sensors preferably includes a low cost MMW Gunn oscillator, MMW detec... | 02/04/1997 |
| 5581257 | Radio frequency automatic identification system A radio frequency automatic identification system detects targets which include a plurality of radio frequency resonators. Information is attributed to the target in accordance with the radio frequency response characteristics of the target, such as the r... | 12/03/1996 |
| 5581256 | Range gated strip proximity sensor A range gated strip proximity sensor uses one set of sensor electronics and a distributed antenna or strip which extends along the perimeter to be sensed. A micro-power RF transmitter is coupled to the first end of the strip and transmits a sequence of RF... | 12/03/1996 |
| 5576627 | Narrow field electromagnetic sensor system and method A narrow field electromagnetic sensor system and method of sensing a characteristic of an object provide the capability to realize a characteristic of an object such as density, thickness, or presence, for any desired coordinate position on the object. On... | 11/19/1996 |
| 5534869 | Open transmission line locating system An open transmission line system for locating an entity (110) moving along a defined pathway uses transmissions from a remote, independent transmitter (106), conveniently a commercial radio or television station. The system comprises two receivers, both t... | 07/09/1996 |
| 5521600 | Range-gated field disturbance sensor with range-sensitivity compensation A field disturbance sensor operates with relatively low power, provides an adjustable operating range, is not hypersensitive at close range, allows co-location of multiple sensors, and is inexpensive to manufacture. The sensor includes a transmitter that ... | 05/28/1996 |
| 5512834 | Homodyne impulse radar hidden object locator An electromagnetic detector is designed to locate an object hidden behind a separator or a cavity within a solid object. The detector includes a PRF generator for generating 2 MHz pulses, a homodyne oscillator for generating a 2 kHz square wave, and for m... | 04/30/1996 |
| 5473311 | Method and apparatus to distinguish human intruder and animal intruder An intrusion detection device of the dual sensing type has a PIR sensor to generate a PIR signal. The device also has a microwave sensor for generating a microwave amplitude signal. The microwave amplitude signal is filtered to generate a microwave high f... | 12/05/1995 |
| 5461384 | Method for montioring an area The invention relates to a method for monitoring an area by a plurality of economical radar systems. These systems operate with CW modulation at low transmission power and can therefore be fully realized in semiconductor technology. The area is divided in... | 10/24/1995 |
| 5457394 | Impulse radar studfinder An impulse radar studfinder propagates electromagnetic pulses and detects reflected pulses from a fixed range. Unmodulated pulses, about 200 ps wide, are emitted. A large number of reflected pulses are sampled and averaged. Background reflections are subt... | 10/10/1995 |
| 5424745 | Detection method and system The invention provides a method and a system for the detection of an object moving relative to another object. The object possibly being a person, an element, an installation, a tool, a surface, etc. According to the invention, a UHF wave is generated in ... | 06/13/1995 |
| 5424744 | Sensor arrangement for sensing a threat A sensor arrangement for the sensing, through the intermediary of the intermediary of high-frequency of an actual threat against an object which is equipped with a receiver device by an attacker penetrating into a radio link. The arrangement has the recei... | 06/13/1995 |
| 5371490 | System for electronic safeguarding against burglary using multiple transmitters and receivers A system for electronic safeguarding against burglary, or for monitoring, having a signal emitter and a receiver for receiving signals from a resonance label if the label is located in the zone of emitted signals. The system is adapted for use in stores, ... | 12/06/1994 |
| 5363108 | Time domain radio transmission system A time domain communications system wherein a broadband of time-spaced signals, essentially monocycle-like signals, are derived from applying stepped-in-amplitude signals to a broadband antenna, in this case, a reverse bicone antenna. When received, the t... | 11/08/1994 |
| 5334981 | Airborne metal detecting radar Method and arrangement for an airborne radar system particularly adapted to detect large metal targets that are concealed from the air by camouflage or natural foliage. The arrangement includes an antenna that transmits a continuous wave electromagnetic s... | 08/02/1994 |
| 5327139 | ID microwave holographic sensor A method and apparatus for measuring both physical and electrical properties of a dielectric object using sequential spatial and spectral microwave data. The apparatus is a step CW microwave transmitter and receiver with a spatially modulated antenna posi... | 07/05/1994 |
| 5315303 | Compact, flexible and integrated millimeter wave radar sensor A compact radar sensor is provided. A monolithic millimeter wave integrated circuit (MMIC) transceiver is provided having a transmitter for transmitting a frequency modulated signal and a receiver for receiving reflected signals thereof. A microstrip patc... | 05/24/1994 |
| 5227799 | Road void search radar system A road void search radar system includes a rotary encoder, a radar controller, an analyzer, and a recording unit. The rotary encoder generates a pulse signal having a period corresponding to a predetermined distance interval traveled by a vehicle. The rad... | 07/13/1993 |
