Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7436909 | Method for estimating time of arrival of received signals for ultra wide band impulse radio systems A method estimates a time of arrival of a signal received in a wireless communication system. An energy in a frame of a received signal is measured to determine a block in the frame, the block representing a coarse time of arrival of the received signal. Multiple ti... | 10/14/2008 |
| 7372897 | Portable information communication terminal, program, and recording medium The number of times for averaging operation for averaging a correlation value of a received signal and a reference signal is properly controlled. When the correlation value is not averaged, since a lower limit value TH_A of a correlation level of a distribution of t... | 05/13/2008 |
| 7352800 | Method of partial parallel interference cancellation A method of Partial Parallel Interference Cancellation (PPIC) is provided for recursively eliminating the Multiple Access Interference from a received signal. Such method is to use a recursion way to eliminate all the Multiple Access Interference (MAI) one by one fr... | 04/01/2008 |
| 7268724 | Reduced-error monopulse processor This monopulse processor provides target position information having an RMS error which is less than that of a conventional monopulse processor. A Σ±jΔ vs. Σ processor is modified to provide a position output signal equal to the smaller in absolute magnitude of ... | 09/11/2007 |
| 7165009 | Apparatus, method and articles of manufacture for velocity and bearing determination of an object A sensor front end is disclosed that is able to discriminate objects based on their range from the sensor and to derive bearing information therefrom. The sensor system includes a signal source for transmitting at least a first and a second sensor signal toward the ... | 01/16/2007 |
| 7068215 | Reducing antenna boresight error Reducing antenna boresight error includes receiving radar pulses reflected from the ground, where pulses are emitted from the antenna of a radar system, reflected by the ground, and received by the antenna. The return pulses carry information about the ground. Measu... | 06/27/2006 |
| 6954176 | Device and method for an antenna array with switchable wide-angle coverage In order in simple manner to switchably cover a wide angle in sectors using an antenna array with broad main lobe, an antenna elements are so arranged, that the elements can be individually selected, so that some elements of the array can be operated in-phase and ot... | 10/11/2005 |
| 6911934 | Apparatus, method and articles of manufacture for sequential lobing high resolution radar A sensor front end that is able to discriminate objects based on their range from the sensor and to derive bearing information therefrom. The sensor system may include a signal source for generating source signal; an antenna system for transmitting the source signal... | 06/28/2005 |
| 6894657 | Bi-directional vector modulator The present invention provides a system for providing a bi-directional vector modulator in which the signal can travel in either direction while the phase shift remains constant. In addition to the functionality of being a phase shifter, the disclosed invention acts... | 05/17/2005 |
| 5341145 | Method for tracking a radar target In a method for tracking a radar target the imaginary part of the complex elevation error signal is utilized and the value of the complex elevation error signal is calculated for a plurality of frequencies in a repeated sequence. The value change between ... | 08/23/1994 |
| 5204683 | Radar receiver for a radar having a digital beam forming antenna This radar receiver, in particular for a radar having an antenna with beam forming through computation, comprises essentially means for matched filtering having a bandwidth B, means for amplitude and phase detection, and means for analog-to-digital conver... | 04/20/1993 |
| 5093666 | Lobing system The radar system includes a sum and difference network coupled to a conventional monopulse type antenna. The difference signals or error signals are applied into a modulator in space quadrature with electrical vectors in a direction transverse to the dire... | 03/03/1992 |
| 5059968 | Radar system and method of operating such system A monopulse receiver includes a monopulse antenna and arithmetic unit for providing a monopulse sum signal, S, an azimuth difference signal, y, and an elevation difference signal, p, an imbalance correction circuit to provide a first composite signal defi... | 10/22/1991 |
| 4989010 | Method and device for identical processing of several simultaneous analog signals of short duration and tracking radar using this device A method and a device which make it possible, simultaneously and in a perfectly identical manner, to process n analog signals (E1, E2 . . . ) of short duration. The device comprises n processing channels (V1, V2... | 01/29/1991 |
| 4673943 | Integrated defense communications system antijamming antenna system The isolation of mainbeam and sidelobe jamming signals from the desired signal being relayed by microwave communication links is accomplished by an antijamming antenna comprising a flat radome, a curved reflector and a transmit dipole. Positioned adjacent... | 06/16/1987 |
| 4652882 | Receiver with wide dynamic range A monopulse receiver, wherein a desired wide dynamic range is achieved for range gated monopulse sum and difference signals, is shown to incorporate: (a) a multiplexer for time-multiplexing such signals; (b) a first and a second receiver channel responsiv... | 03/24/1987 |
| 4307399 | Circuit for detecting and homing on continuous wave radar targets An apparatus for providing increased homing capabilities in a guided miss seeker against a continuous wave radar signal by compressing the received signal which effectively increases the received signal level by more than twenty decibels.... | 12/22/1981 |
| 4163973 | Means for developing a radar tracking error signal A tracking radar error signal that is independent of pulse to pulse variations of amplitude of the received signal is derived by combining separately detected sum signal energy and difference signal energy in a manner that provides composite error signal ... | 08/07/1979 |
| 4088997 | Single channel monopulse radar system A single channel monopulse radar system including an antenna for transmitting and receiving pulsed radar signals; an arithmetic matrix for providing a pulsed sum information signal, a pulsed azimuth difference information signal and a pulsed elevation dif... | 05/09/1978 |
| 4011564 | Phase modulated monopulse system There is disclosed a monopulse radar system that eliminates scan modulated amming and which scans returning radar signals at filters rather than antennas and converts the signals to frequency modulated information rather than amplitude modulated informatio... | 03/08/1977 |
| 3977000 | Monopulse radar receiver An improved monopulse receiver is shown to include an I.F. section wherein monopulse pairs of signals, meaning a sum and an elevation difference signal pair and a sum and an azimuth difference signal pair, are passed through paths arranged so that the sig... | 08/24/1976 |
| 3962705 | Radar microwave lobing systems 4. A radar system responsive to unmodulated elevation error signals, azimuth error signals and sum signals comprising a modulator responsive to the elevation and azimuth error signals coupled in space quadrature for rotating said error signals at a predet... | 06/08/1976 |
| 3946393 | Transponder for use in a radio frequency communication system A transponder for use in a radio frequency communication system is disclosed wherein a received radio frequency signal is converted into an intermediate frequency signal, the latter signal being distorted by a nonlinear network to produce a composite sign... | 03/23/1976 |
