Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 7365603 | FET amplifier, pulse modulation module, and radar device An FET amplifier includes an FET for amplifying a high-frequency signal to be input to the gate on the basis of a gate bias voltage from a gate bias control circuit. In the FET amplifier, a high-frequency signal input circuit and the output portion of an inverting a... | 04/29/2008 |
| 7356423 | Apparatus and method for reading out a differential capacity with a first and second partial capacity An apparatus for reading out a differential capacity with a first and second partial capacity includes a first oscillator having a first frequency-determining element connectable to the first partial capacity and a second oscillator having a second frequency-determi... | 04/08/2008 |
| 7327307 | Radar system with adaptive waveform processing and methods for adaptively controlling the shape of a radar ambiguity function An adaptive waveform radar system transmits a selected waveform of a family of related waveforms and either phase shifts or bit shifts the radar return signal for correlating with the other waveforms of the family. In some embodiments, phase shifting may be performe... | 02/05/2008 |
| 7304604 | Radar sensor and method for operating a radar sensor In a radar sensor, a continuous microwave signal is passed through an RF switch which is periodically controlled by a pulse signal. The pulse signal is frequency modulated in such a way that the spectrum of the pulse signal is expanded without decorrelation occurrin... | 12/04/2007 |
| 7218269 | Method for enlarging the interference-free dynamic range of non-linear signal processing components A method for enlarging the interference-free dynamic range of non-linear signal-processing components in receiver systems, in the conversion of input frequencies fin into output frequencies fout. According to the invention, at least one linear ... | 05/15/2007 |
| 7212154 | Apparatus for producing an amplified radio frequency pulse Apparatus for producing an amplified Radio Frequency pulse includes a controller for monitoring the output amplified pulse and determining therefrom a correction for a deviation in the characteristics. The correction is applied by a phase shifter or amplitude contro... | 05/01/2007 |
| 7196658 | Waveform generation method, waveform generation program, waveform generation circuit and radar device A conventional waveform generation circuit was required to increase a number of bits or a sampling rate for a D/A converter to enhance a precision of waveform shaping, and had a problem that a cost was increased. Therefore, as a method for enhancing the precision of... | 03/27/2007 |
| 7158077 | Radar device and method for suppressing interference with a radar device A radar device is described having an arrangement to generate a carrier signal having a carrier frequency fT, an arrangement to generate pulses having a pulse repetition rate fPW, an arrangement to split the carrier signal between a transmissio... | 01/02/2007 |
| 7151483 | System and method for concurrent operation of multiple radar or active sonar systems on a common frequency A system and corresponding method for the concurrent operation of multiple radar systems on a common frequency and in the same geographical area includes a waveform generator that specifies certain operating parameters for the transmitted radar pulses. In a first in... | 12/19/2006 |
| 6943640 | Current source modulator A current source modulator (202; 302, 502) provides power to radar transmitters. The modulator comprises a power supply (210, 310, 510) providing, when enabled, a known current to a storage capacitor (145). A comparator circuit (220) prov... | 09/13/2005 |
| 6937183 | Object detecting method and object detector Beams are irradiated in three directions by switching an irradiation direction of a mainlobe of an antenna by stages, and an echo is received from a detection object obtained in the mainlobe or a sidelobe in each irradiation direction. Then, reflection power intensi... | 08/30/2005 |
| 6933878 | Wide bandwidth radar A wave-form generator drives a number of microwave generating devices each operating at different frequency bands. The output of each microwave generator is connected to its own transmission channel of limited bandwidth which contains all the non-linear components n... | 08/23/2005 |
| 6798375 | Radar device and a method for suppressing interference in a radar device A radar device includes elements for generating a carrier signal having a carrier frequency fT, elements for generating pulses with a pulse repetition frequency fPW, elements for distributing the carrier signal to a transmission branch and a re... | 09/28/2004 |
| 6714286 | Agile pseudo-noise coded ranging ladar An apparatus and method of dynamically optimizing an acquisition range of a radar system, including modulating a CW radar signal with a PN code that has an adjustable code frequency of modulation and an adjustable chip length. The method includes transmitting the mo... | 03/30/2004 |
| 6665055 | Light-wave rangefinder using a pulse method The present invention relates to a light-wave rangefinder using a pulse method, which can reduce a measurement error, in which a tuned amplifier converts an electric signal of a light receiving unit into a damped oscillation waveform and thereby an arithm... | 12/16/2003 |
| 6630903 | Programmable power regulator for medium to high power RF amplifiers with variable frequency applications A power regulator regulates the power provided to a transistor-based circuit, such as that which might be employed in a high stability MTI radar system. According to the invention, a variable reference voltage is controlled based on the frequency of opera... | 10/07/2003 |
| 6502043 | Process and device for reducing the spectral line noise inside an aircraft, especially a rotating-wing aircraft, in particular a helicopter Process and device for reducing the spectral line noise inside an aircraft, especially a rotating-wing aircraft, in particular a helicopter. Said device (1) comprises sensors (Ca, Cb) for measuring the values of vibratory and/or acoustic parameters, controllab... | 12/31/2002 |
| 6392588 | Multifrequency signal structure for radar systems A multifrequency phase-coded signal structure is presented for use in a system like a radar or sonar or detecting a remote target. The signal structure comprises at least one pulse signal in the form of a mutually complementary set of M sequences, each se... | 05/21/2002 |
| 6281835 | Radar transmitter The invention relates to solid-state radar transmitter, comprising a number of amplifier modules (4.i). To prevent the trailing edge of a steer pulse supplied to the radar transmitter from becoming too steep when passing the amplifier modules (4.i) driven... | 08/28/2001 |
| 6226077 | Self-calibrating precision timing circuit and method for a laser range finder A highly precise range measurement instrument is made possible through the use of a novel and efficient precision timing circuit which makes use of the instrument's internal central processing unit crystal oscillator. A multi-point calibration function in... | 05/01/2001 |
| 6081226 | Multi-mode radar exciter A radar exciter including a direct digital synthesis (DDS) wideband waveform generator which performs the frequency synthesis function heretofore performed by a direct analog synthesizer. This is achieved by deriving the DDS frequencies, the exciter RF fr... | 06/27/2000 |
| 6057910 | Self-calibrating precision timing circuit and method for a laser range finder A highly precise range measurement instrument is made possible through the use of a novel and efficient precision timing circuit which makes use of the instrument's internal central processing unit crystal oscillator. A multi-point calibration function in... | 05/02/2000 |
| 5920279 | Procedure and system for the control of a number of radar units A procedure and a system increase the performance of a group of radar units. The radar units are arbitrarily located in such a way that the respective antenna beam of a radar unit functioning as a normal radar at least partially coincides with the antenna... | 07/06/1999 |
| 5880821 | Self-calibrating precision timing circuit and method for a laser range finder A highly precise range measurement instrument is made possible through the use of a novel and efficient precision timing circuit which makes use of the instrument's internal central processing unit crystal oscillator. A multi-point calibration function in... | 03/09/1999 |
| 5808580 | Radar/sonar system concept for extended range-doppler coverage A method and apparatus for preventing the occurrence of range ambiguities and Doppler ambiguities in both a radar and sonar environment. A series of N pulses are produced, each of which contains a number of contagious subpulses. Each of the subpulses exhi... | 09/15/1998 |
| 5805107 | Cost-effective method for determining a pulse response of a high-resolution, band-limited radar channel For less expensive estimation the impulse response xMOS of a high-resolution, band-limited radar channel in a radar station operating with an expanded transmitted pulse a(t), from a received signal e, over which a correlated or uncorrelated add... | 09/08/1998 |
| 5798729 | Radar apparatus A radar apparatus provided with a transmitting unit, antenna unit and a receiver unit. The transmitting unit transmits pulses having a modulation for enabling pulse compression on reception. As an ECCM feature, the radar apparatus is further provided with... | 08/25/1998 |
| 5786788 | Radar system and method for reducing range sidelobes A system (10) for reducing range sidelobes adapted for use with pulsed radar systems. The inventive system (10) includes a mismatched filter (90) for correlating a received signal (84) with a correlator signal (92) having a different length than the trans... | 07/28/1998 |
| 5777574 | High resolution imaging radar linear frequency modulation bandwidth multiplier An apparatus and method of linear frequency modulation waveform bandwidth multiplication including a digital linear frequency modulation waveform synthesizer for generating a synthesized waveform having an upchirp component of linearly varying frequency d... | 07/07/1998 |
| 5774089 | Method to resolve ambiguities in a phase measurement In a method to resolve ambiguities in a phase measurement for application in radar interferometry, a frequency estimation method is used, starting from conjugate complex products of pairs of adjacent pixels in an interferogram. The resolution of these pro... | 06/30/1998 |
| 5646626 | Method and apparatus for digital correlation in pseudorandom noise coded systems A pseudorandom noise coded system (100) compensates for imperfections, improving out of range rejection, and includes a digital correlator (200) having a first complex multiplier (202) receiving a sequence of sampled data words and a sequence of precomput... | 07/08/1997 |
| 5646627 | Method and apparatus for controlling a biphase modulation to improve autocorrelation in pseudorandom noise coded systems This invention relates to a method and apparatus for controlling a biphase modulator (602, 702) to improve autocorrelation in pseudorandom noise coded systems. The biphase modulator modulates a carrier frequency with one of two phase states responsive to ... | 07/08/1997 |
| 5644315 | Doppler ratio detection radar with range CFAR This invention improves the detection performance of doppler radar by censoring clutter at the output of the doppler processor, and it functions in operative association with a range CFAR. By a selective rejection of signals based on doppler characteristi... | 07/01/1997 |
| 5612779 | Automatic noise threshold determining circuit and method for a laser range finder An automatic noise threshold circuit and method automatically sets an operating threshold for a signal receiving section of a laser pulse transmitting device such that a constant noise pulse firing rate is output from a detector to provide maximum return ... | 03/18/1997 |
| 5594451 | Processing method using an advanced radar waveform for simultaneous matched processing and range profiling of different size targets A method of processing radar returns derived from a new radar waveform. The method processes radar returns derived from transmitting the radar waveform to provide simultaneous matched processing and range profiling of different size objects in the presenc... | 01/14/1997 |
| 5576713 | Compensation circuit for improving modulation characteristic, and modulator and radar equipment using the same A differential gain characteristic can be equivalently improved by providing a compensation circuit. The compensation circuit compensates a differential gain of a voltage-controlled oscillator, of which oscillating frequency is controlled by a control vol... | 11/19/1996 |
| 5574464 | High-speed switching device for monostatic impulse radar A switching device is provided which uses an array of high-speed photoconductive semiconductor switches laid out in a stripline configuration to achieve a transmitter-to-receiver isolation sufficient to support a monostatic configuration for a high-power,... | 11/12/1996 |
| 5568150 | Method and apparatus for hybrid analog-digital pulse compression A method and apparatus for hybrid analog-digital pulse compression, as well as, a method of use and manufacture includes an analog intermediate frequency filter, a converter, and a digital correlator. The analog intermediate frequency filter filters and w... | 10/22/1996 |
| 5559519 | Method and system for the sequential adaptive deterministic calibration of active phased arrays Apparatus for calibrating a phased array antenna having a plurality of active modules and a test manifold. An RF antenna, which is both a transmitting and receiving antenna is positioned at a far field range from the antenna to be calibrated. A receiver i... | 09/24/1996 |
| 5530451 | Repeater with low spurious time outputs A device which increases the rate of reduction of spurious output signals includes a path capable of carrying a signal from an input to an output. A plurality of storage elements and a plurality of interspaced switches are serially positioned in the path.... | 06/25/1996 |
