Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7583224 | Radar apparatus with automatic local oscillator tuning function The portion corresponding to a main bang signal leaking from a transmission/reception switching unit is extracted as a frequency estimation signal from an IF signal from a mixer in a signal extracting unit, a frequency is estimated in a frequency estimating unit, an... | 09/01/2009 |
| 7405869 | Method and system of local oscillator signal generation Methods and apparatus for local oscillator generation are provided. In a method embodiment, a method of signal processing includes splitting a signal having a first frequency into at least a first portion and a second portion. The method also includes generating a s... | 07/29/2008 |
| 7388537 | Radar detector with reduced emissions A radar detector includes features to reduce emissions such as those typically generated by the detector's local oscillator. Two low noise amplifiers (LNA's), operating in X band and a combined K/Ka band, respectively amplify X and K/Ka band signals from separate an... | 06/17/2008 |
| 7362261 | Linear frequency-modulated pulse radar A linear frequency-modulated pulse radar system is provided in which the echo signal is mixed with a de-ramp signal, in order to reduce the bandwidth. The transmission signal of the pulse radar and the de-ramp signal are generated with the same reference oscillator,... | 04/22/2008 |
| 7259714 | Unique space time adaptive system (USS) A method of detecting radar returns and measuring their parameters with or without clutter present and no clutter cancellation employed which includes transmitting at least one pulse; processing the returns surpassing a threshold detected in one range azimuth bin an... | 08/21/2007 |
| 7248208 | Methods and systems for maintaining a position during hovering operations A method for maintaining a position of a hovering vehicle that incorporates a radar altimeter is described. The method includes receiving signals at the radar altimeter based on a change of horizontal direction, operating the radar altimeter to generate a Doppler fr... | 07/24/2007 |
| 7244021 | Image recording device An image recording device has: a first recording head which discharges a first ink for a first image forming process; a second recording head which discharges a second ink for a second image forming process; a curing section which cures an ink on a recording medium;... | 07/17/2007 |
| 7154434 | Anti-personnel airborne radar application An anti-personnel airborne radar application for ultra slow target tracking is provided. The anti-personnel airborne radar application includes a rotorcraft and a signal processing system. The signal processing system includes a radar antenna supported by said rotor... | 12/26/2006 |
| 7095366 | High-frequency oscillation apparatus, radio apparatus, and radar A high-frequency oscillation apparatus wherein an oscillation signal output from a voltage controlled oscillator (VCO) is transferred through a transfer line to a resonator and the resonator is excited. The resonator is coupled with a second transfer line and an RF ... | 08/22/2006 |
| 7079072 | Helicopter recognition radar processor A radar processor is disclosed for processing the radar return samples from a Doppler radar receiver to discriminate helicopter targets from fixed-wing targets. The radar processor defines the spectral components of the radar return components due to the helicopter ... | 07/18/2006 |
| 7064617 | Method and apparatus for temperature compensation Temperature compensation is achieved by adjusting a divide ratio of a multi-modulus divider circuit in a feedback path of a phase-locked loop based on the detected temperature. The divide ratio is adjusted based on stored adjustment values stored in non-volatile mem... | 06/20/2006 |
| 7061423 | Interleaved sweep for detection of pop transmissions in police radar detectors In a police radar detector, a sweep signal defines at least one first sweep signal and at least one second sweep signal with the at least one second sweep signal being seamlessly inserted into the first sweep signal so that the first sweep signal is interrupted duri... | 06/13/2006 |
| 7053815 | Radar tracking system A radar tracking system for an anti-aircraft, missile, including angle tracking, doppler tracking and range tracking feedback loops operating on sum and difference channels. Fast fourier transform digital filters are used to provide a frequency spectrum of the sum a... | 05/30/2006 |
| 7019684 | Phase lock loop circuitry An arrangement for reducing the effect of vibration-induced changes in phase of the first local oscillator in a tracking receiver wherein final detection is accomplished by a synchronous detector in a phase lock loop incorporating a voltage-controlled oscillator is ... | 03/28/2006 |
| 6980151 | System and method for onboard detection of ballistic threats to aircraft A bi-static continuous wave radar system and related methods for detecting incoming threats from ballistic projectiles includes a remote source of RF illumination, and a local receiver installed in one or more target aircraft. A first receiving channel acquires dire... | 12/27/2005 |
| 6980153 | Radar altimeter for helicopter load carrying operations A radar altimeter for vehicles that operate with a load suspended underneath is described. The radar altimeter includes a transmitter configured to transmit radar signals toward the ground, a receiver configured to receive reflected radar signals from the ground and... | 12/27/2005 |
| 6972710 | Automotive radio wave radar and signal processing In an automotive radio wave radar, a center frequency of a transmitted wave is shifted at a certain cycle, and position information of an obstacle detected at three or more center frequencies is subjected to decision by majority to determine whether detection result... | 12/06/2005 |
| 6972711 | Transmit-receive FM-CW radar apparatus Disclosed is a transmit-receive FM-CW radar apparatus which switches between transmission and reception by time division control, wherein amplifiers capable of controlling gain are provided in a transmitter signal path and a receiver signal path, respectively, and w... | 12/06/2005 |
| 6930631 | Sensor front-end with phase coding capability A sensor front end for an electronic radar sensor is disclosed that provides for a lower parts count while providing technical functionality by using multifunction parts, i.e., parts that are used both in transmitting and receiving. The sensor front end includes a c... | 08/16/2005 |
| 6927677 | Blind spot detector system A blind spot detector system adapted to the exterior of a vehicle comprising at least one infrared light emitting diode (LED), an infrared photodetector and demodulator, and a microcontroller. The output power of the infrared transmitter is linearly modulated, enabl... | 08/09/2005 |
| 6693578 | Mixer optimization for active radar warning receiver A method to optimize a mixer (20) includes setting a DC bias current (24) at a predetermined level correlated to an RF frequency or band of interest, and varying the power output (32) of a local oscillator (36) until the DC voltage (66) of the mixer (20) ... | 02/17/2004 |
| 6691031 | Method and apparatus for substituting sensor data for satellite signal in GPS receiver Embodiments of the present invention are directed to a method and apparatus for substituting temperature sensor data for a satellite signal in a GPS receiver. In one embodiment of the present invention, a mathematical model of a GPS receiver's clock's res... | 02/10/2004 |
| 6630902 | Shipboard point defense system and elements therefor A radar receiver is shown wherein the frequency of a first local oscillator is changed to bring an intermediate frequency signal representative of a moving target into frequency coincidence with a signal from a reference oscillator of fixed frequency.... | 10/07/2003 |
| 6563450 | Shipboard point defense system and elements therefor A combined defense and navigational system on a naval vessel is disclosed. The disclosed system includes a track-while-scan pulse radar which is controlled to provide either navigational information or tracking information on selected targets. Additionall... | 05/13/2003 |
| 6536893 | Waterfast and smearfast inks using ink jet delivered dye sublimation dyes A method of printing an ink jet ink on a print medium is provided, wherein a printed image is formed that is both waterfast and smearfast. The method employs a water-insoluble colorant and comprises: (a) providing an aqueous-based ink containing at least ... | 03/25/2003 |
| 6532271 | Carrier recovery and doppler frequency estimation Method and system for carrier recovery and estimation of Doppler shift from a signal source that is moving relative to a signal receiver. A pure carrier preamble for the received signal is processed through each of two stages of a linear predictor to obta... | 03/11/2003 |
| 6457825 | Ink jet printing method An ink jet printing method comprising the steps of: A) providing an ink jet printer that is responsive to digital data signals; B) loading the printer with an ink jet recording element comprising a support having thereon a porous image-receiving layer comprising ... | 10/01/2002 |
| 6441774 | Heliographic ink jet apparatus and imaging processes thereof A process including: jetting at least one ink from a color ink set onto a substrate to form a first pixel; and jetting a heliosing ink onto the first pixel to form a heliosed pixel, wherein the first pixel is substantially free of resolution diminution in... | 08/27/2002 |
| 6344819 | Heliographic ink jet apparatus and imaging processes thereof A process including: jetting at least one ink from a color ink set onto a substrate to form a first pixel; and jetting a heliosing ink onto the first pixel to form a heliosed pixel, wherein the first pixel is substantially free of resolution diminution in... | 02/05/2002 |
| 6188349 | Frequency adjusting arrangement A frequency adjusting arrangement is disclosed whereby the frequency of a local oscillator, incorporating an Yttrium-Iron-Garnet filter as the frequency determining element, is controlled to follow a coded waveform having a bandwidth wider than the bandwi... | 02/13/2001 |
| 6147591 | Process for transmitting data between a read/write device and a transponder The invention is a process to transmit data between a read/write device and a transponder. The data is transmitted by a change in field strength of an electromagnetic or magnetic field, and the times between sequential field strength changes are evaluated... | 11/14/2000 |
| 6137406 | Double superheterodyne type microwave detector capable of detecting leaked microwaves A double superheterodyne type microwave detector is constructed from a reception antenna; a first local oscillator; a second local oscillator; reception means for detecting microwaves having prescribed frequencies based on signals obtained by carrying out... | 10/24/2000 |
| 6091356 | Chirp source with rolling frequency lock for generating linear frequency chirps A source for a linear homodyne transceiver that generates repeated linear chirps. A YIG oscillator with a main coil and an FM coil receives a basic linear current ramp at the main coil to generate a chirp. The FM coil is coupled to receive a PLL error sig... | 07/18/2000 |
| 6072427 | Precision radar timebase using harmonically related offset oscillators Two crystal oscillators are configured as a "plug-and-play" precision transmit-receive clock that requires no calibration during manufacture. A first crystal oscillator generates a transmit clock and a second crystal oscillator operates at a small offset ... | 06/06/2000 |
| 6044333 | Process and device to transmit data between a read/write device and a transponder The invention relates to a device and process for data transmission. The data is transmitted by changes in the field strength of an electromagnetic or magnetic field, and then the times between at least two sequential field strength changes are evaluated.... | 03/28/2000 |
| 5940025 | Noise cancellation method and apparatus A radar transmitter for producing a radar signal in response to a radar trigger signal fed thereto. The transmitter includes a radio frequency oscillator for producing a signal having a radio frequency carrier to be used in each transmitted radar signal. ... | 08/17/1999 |
| 5835052 | Radar detector and the adjustment system and method thereof Disclosed is a radar detector for frequency sweeping a wide band range by using a VCO circuit to detect a radar signal, wherein the frequency precision of the received band can be improved by using comparatively simple and inexpensive circuits. This radar... | 11/10/1998 |
| 5790068 | AFC control switching circuit An automatic frequency control loop for maintaining a center carrier freqcy fed to a notch filter for blocking out system reverberation includes, along with the conventional elements found in an automatic frequency control loop, a control switching circu... | 08/04/1998 |
| 5719580 | Method and apparatus for digital compensation of VCO nonlinearity in a radar system An apparatus for correcting for nonlinearities in modulation systems includes a transmitter (24, 28, 48, 50, 52) for transmitting a time varying modulated radar signal (56). A receiver (58, 62) receives an echo signal (60) resulting from reflection of the... | 02/17/1998 |
| 5661485 | Homodyne receiver apparatus and method An apparatus and method of homodyne reception includes power divider circuitry for providing first and second signals from an input signal. Oscillator circuitry generates first and second oscillator signals. The first signal and second oscillator signal a... | 08/26/1997 |
