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 |
| 8174433 | Bias estimation and orbit determination According to one embodiment, bias estimation and orbit determination include receiving measurements in real time. The measurements include radar measurements and radar array orientation measurements. The radar measurements are generated by a radar system and indicat... | 05/08/2012 |
| 7724181 | Target object detection apparatus for acquiring information concerning target objects based on correlation matrix derived from signal values corresponding to reflected electromagnetic waves A target object detection apparatus periodically executes a transmit/receive operation to transmit radar waves and obtain received signals from resultant incident reflected waves from respective target objects. An individual correlation matrix of received signal val... | 05/25/2010 |
| 7423576 | System and method for radar tracking using communications packets According to the invention, IEEE 802.15.4a packets are used for communications, ranging and passive radar (detecting changes/motions, tracking objects in the environment) functionality. Changes and motions in the environment are detected by exploiting the specific p... | 09/09/2008 |
| 7420503 | Small-sized low-power dissipation short-range radar that can arbitrarily change delay time between transmission and reception with high time resolution and method of controlling the same In a configuration according to a short-range radar of the present invention and a method of controlling the same, the timing at which a variable-period pulse output from a variable-period pulse generator including a direct digital synthesizer (DDS) has shifted in l... | 09/02/2008 |
| 7420501 | Method and system for correlating radar position data with target identification data, and determining target position using round trip delay data A method and system for using a single transceiver to correlate radar position data with target identification data. Two transceivers, operating in round trip delay mode, can be used to provide two possible positions for a given target when radar coverage is lost or... | 09/02/2008 |
| 7408499 | Generations of sequences of waveforms A sequence of waveforms is generated by producing a primary symbol sequence and, for each symbol within the sequence, substituting a randomly-selected waveform. The primary symbol sequence has a narrow autocorrelation function, and may be a train of pulses, with the... | 08/05/2008 |
| 7394422 | Interferometer-type radar A transmitter for transmitting signals to targets and a receiver for receiving signals reflected from targets are included. The transmitter outputs CW signals for detecting direction and velocity of the target. The receiver performs: a function of receiving signals ... | 07/01/2008 |
| 7345621 | Real-time multistatic radar signal processing system and method A real-time signal processing engine robustly detects, localizes, tracks and classifies ground targets based on radar signals from a multistatic radar system. The system differentiates between different targets based on an optimized cost function, which can include ... | 03/18/2008 |
| 7315276 | Beam compression radar A concept is described for broadening the beam of a phased array radar antenna to provide continuous illumination of all radar targets within the search space, and this beam is compressed upon reception to realize the angular resolution that is possible with the ant... | 01/01/2008 |
| 7301496 | Radar apparatus In an FM-CW radar apparatus which determines the azimuth to a target by a phase monopulse technique, an abnormal value resulting from the presence of multiple targets is detected. Three receiving antennas are arranged at spacings of 5λ/4 and 6λ/4, respectively, an... | 11/27/2007 |
| 7268723 | System and method for locating targets using measurements from a space based radar A system and method for determining a position of a target within an acceptable tolerance using an iterative approach. A airborne or space-based measuring device is used to measure an estimated position of the target. The information from the measuring device is use... | 09/11/2007 |
| 7248205 | Radar apparatus A transmitter emits into an intended search space a radar wave having a predetermined frequency pulse-modulated by a trigger pulse of a predetermined width. A receiver receives a reflected wave of the radar wave and outputs a receive signal. A local pulse generator ... | 07/24/2007 |
| 7215954 | Resource allocation method for multi-platform communication system A mobile wireless communications system including a plurality of individual transponding nodes of various types, all in communication with a central processing hub. A local user signal is processed by the central processing hub and radiated through multiple paths to... | 05/08/2007 |
| 7212159 | Positioning system, apparatus and method A positioning system, apparatus and method include a transmitter (2), a receiver (4) and a plurality of reflectors (6). A signal is transmitted from transmitter to receiver both directly and via the reflectors (6). A location server (8... | 05/01/2007 |
| 7199750 | Real-time multistatic radar signal processing system and method A real-time signal processing engine robustly detects, localizes, tracks and classifies ground targets based on radar signals from a multistatic radar system. The system differentiates between different targets based on an optimized cost function, which can include ... | 04/03/2007 |
| 7196653 | Imaging apparatus and method An imaging apparatus has transmitter illuminating a selected surface with a radar beam footprint, and processor for profiling/processing the radar returns so as to derive attitude information in real time about a number of predefined axes associated with the radar w... | 03/27/2007 |
| 7193557 | Random set-based cluster tracking Tracking objects by receiving a dataframe from a detection sensor device, the dataframe containing a timestamp and data corresponding to each detected object, generating new observation nodes for each detected object, propagating group track state parameters to obta... | 03/20/2007 |
| 7181162 | Communication system using multiple link terminals A communication system has a plurality of bases stations generating communication portions from a base station communication signal. The plurality of base stations are capable of using the entire allocated bandwidth to generate the base station communication portion... | 02/20/2007 |
| 7167704 | Communication system using multiple link terminals for aircraft A communication system has a communication infrastructure and a gateway station communicating a communication signal to the communication infrastructure. An airplane having an antenna coupled to a processing circuit for establishing a plurality of multiple communica... | 01/23/2007 |
| 7164381 | Target identifying apparatus, target identifying method, and target identifying program A target identifying apparatus identifies a target from a first signal distribution and includes a calculation section, a target signal identifying section, a subtraction section, and a correction section. The calculation section calculates a quadratic approximate e... | 01/16/2007 |
| 7161529 | Dual forward scattering method for modeling multipath propagation Analysis of electromagnetic (or acoustic) multipath propagation inventively focuses upon the transmitter-to-target propagation (transmitted propagation reaching target via both direct pathway and forward scattered pathway) and the target-to-receiver propagation (re-... | 01/09/2007 |
| 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 |
| 7151476 | Radar system having a beamless emission signature A radar system having a beamless emission signature is described. In one implementation, the radar system includes a transmission system and a receiver system. The transmission system is configured to transmit a pattern comprising a plurality of radar signals having... | 12/19/2006 |
| 7132975 | Apparatus and method for detecting moving objects An ultra wideband radar system for detecting moving objects comprising an antenna, which may be scanned in at least one dimension, and a signal processor wherein the signal processor includes a scan combiner that combines scan information in accordance with a candid... | 11/07/2006 |
| 7103317 | Communication system using multiple link terminals for aircraft A communication system has a communication infrastructure and a gateway station communicating a communication signal to the communication infrastructure. An airplane having an antenna coupled to a processing circuit for establishing a plurality of multiple communica... | 09/05/2006 |
| 7089000 | Multi-node wireless communication system with multiple transponding platforms A mobile wireless communications system including a plurality of individual transponding platforms all in communication with a central processing hub. A signal processed by the central processing hub is radiated simultaneously through multiple paths to a plurality o... | 08/08/2006 |
| 7068733 | Sampling technique for digital beam former A mobile satellite payload 18 and a method for sampling communication signals 26 are provided. The mobile satellite payload 18 uses a plurality of receive radiating elements 24 within a phase array antenna 22 to convert the communi... | 06/27/2006 |
| 7046718 | Coherent phase synchronous code division multiple access communications from multiple transponder platforms A method for coherent phase synchronous CDMA communications between a gateway and multiple subscribers via multiple transponder platforms that includes the step of synchronizing a local reference clock for each subscriber in a service area to a single master referen... | 05/16/2006 |
| 7030814 | System and method to estimate the location of a receiver in a multi-path environment System and method to determine the location of a receiver in a multipath environment are provided. The received signal is correlated with the reference signals associated with the transmitting sources. Each correlation function is processed to derive various types o... | 04/18/2006 |
| 7026981 | Surface interaction region methodology for delimiting multipath propagation inquiry Analysis of electromagnetic (or acoustic) multipath propagation inventively confines the assessment of multipath propagation to a “surface interactive region” (“SIR”), intermediate the target and transmitter and/or the target and receiver. The down range tim... | 04/11/2006 |
| 7012552 | Civil aviation passive coherent location system and method A civil aviation passive coherent location system and method is disclosed. A receiver subsystem receives reference transmissions from an uncontrolled transmitter. The receiver subsystem also receives scattered transmissions originating from the uncontrolled transmit... | 03/14/2006 |
| 6999025 | Clutter rejection in a passive radar receiver of OFDM signals with antenna array The invention concerns a passive radar receiver with an array of antennas for a OFDM received signal comprising frames of symbols each emitted on coded orthogonal carriers. After formatting received signals into digital symbols, dummy signals from dummy OFDM emitter... | 02/14/2006 |
| 6995705 | System and method for doppler track correlation for debris tracking The present invention is directed to a system and method for Doppler track correlation for debris tracking in PCL radar applications. The disclosed embodiments describe the systems and methods used in the detection of debris pieces and the association of the Doppler... | 02/07/2006 |
| 6940447 | Radar device and method for operating a radar device A radar device having means for generating a carrier-frequency signal, means for shaping pulses, means for generating modulated radar pulses from the carrier-frequency signal, means for emitting modulated signals as radar pulses, means for receiving radar pulses and... | 09/06/2005 |
| 6941138 | Concurrent communications between a user terminal and multiple stratospheric transponder platforms A method for communicating between a user terminal and multiple stratospheric transponder platforms includes the steps of positioning a plurality of stratospheric transponder platforms (102, 104, 106, 108) in a substantially fixed position (152) with r... | 09/06/2005 |
| 6941196 | Modified three lobe search method A method of finding a vertical velocity of a vehicle by first forming two cost functions from three pulse return times. An independently determined approximate vertical velocity and a Fletcher-Powell estimation technique are used on the first cost function, to selec... | 09/06/2005 |
| 6920309 | User positioning technique for multi-platform communication system A mobile wireless communications system including a plurality of individual transponding nodes all in communication with a central processing hub. A local user signal is processed by the central processing hub and radiated through multiple paths to a plurality of th... | 07/19/2005 |
| 6914931 | Spread spectrum receiver kalman filter residual estimator method A GPS receiver receives GPS spread spectrum communication signals subject to carrier demodulation and code phase autocorrelation using tightly coupled Kalman filter residual estimation based on Ricatti matrix computation for generating code phase errors and carrier ... | 07/05/2005 |
| 6909875 | Multi-platform wireless communication system for a variety of different user types A mobile wireless communications system including a plurality of individual transponding nodes of various types, all in communication with a central processing hub. A local user signal is processed by the central processing hub and radiated through multiple paths to... | 06/21/2005 |
| 6876859 | Method for estimating TDOA and FDOA in a wireless location system A method, used in locating a mobile transmitter, includes providing a set of cross-correlation values, wherein each cross-correlation value is associated with a corresponding TDOA and/or FDOA estimate and is produced by cross-correlating a reference signal with a co... | 04/05/2005 |
