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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 6982538 | Methods and apparatus for generating a sinusoidal motor drive signal for a MEMS gyroscope An apparatus is described which reduces a time delay and a resultant phase shift in a gyroscope motor drive signal. The motor drive signal originates from a numerically controlled oscillator whose output is sampled at a predetermined rate. The apparatus includes a f... | 01/03/2006 |
| 6950056 | Methods and apparatus for determination of a filter center frequency A method for calculating a center frequency and a bandwidth for a radar doppler filter is herein described. The center frequency and bandwidth are calculated to provide radar performance over varying terrain and aircraft altitude, pitch, and roll. The method include... | 09/27/2005 |
| 6931711 | Methods and apparatus for removing gases from enclosures A method for reducing oxidation of indium seals within a substantially sealed housing is disclosed. The method includes installing a getter within the housing, the getter including a getter material to reduce oxygen and water vapor levels within the housing, reducin... | 08/23/2005 |
| 6927098 | Methods and apparatus for attaching MEMS devices to housing A method for increasing the bonding strength between a die and a housing for the die is described where a micro-electromechanical system (MEMS) device is formed on the die. The method comprises depositing a plurality of clusters of contact material onto a bottom sur... | 08/09/2005 |
| 6924165 | Methods and systems for buried electrical feedthroughs in a glass-silicon MEMS process A method for providing conductive paths into a hermetically sealed cavity is described. The sealed cavity is formed utilizing a silicon-glass micro-electromechanical structure (MEMS) process and the method includes forming recesses on a glass substrate everywhere th... | 08/02/2005 |
| 6914323 | Methods and apparatus for attaching getters to MEMS device housings A method for reducing occurrences of loose gettering material particles within micro-electromechanical system (MEMS) devices is described. The MEMS devices include a micro-machine within a substantially sealed cavity formed by a housing and a cover for the housing. ... | 07/05/2005 |
| 6897803 | Radar altimeter with forward ranging capabilities A method for incorporating a forward ranging feature into a radar altimeter is described. The method comprises positioning an antenna of the altimeter such that a side lobe of a radar signal radiates from the antenna in a forward direction and processing a radar ret... | 05/24/2005 |
| 6897804 | Methods and apparatus for determination of a filter center frequency A method for calculating a center frequency and a bandwidth for a radar doppler filter is herein described. The center frequency and bandwidth are calculated to provide radar performance over varying terrain and aircraft altitude, pitch, and roll. The method include... | 05/24/2005 |
| 6894640 | Methods and apparatus for conversion of radar return data An in-phase/quadrature component (IQ) mixer is configured to reject returns from a negative doppler shift swath in order to mitigate corruption of returns of a positive doppler shift swath. The mixer includes a sample delay element which produces a quadrature compon... | 05/17/2005 |
| 6889934 | Systems and methods for guiding munitions A method of guiding a munition to a target transmitting one or more signals is described. The method includes configuring the munition with a radio frequency receiver, an antenna for the receiver mounted such that a main beam of the antenna pattern for the antenna i... | 05/10/2005 |
| 6888233 | Systems for buried electrical feedthroughs in a glass-silicon MEMS process A method for providing conductive paths into a hermetically sealed cavity is described. The sealed cavity is formed utilizing a silicon-glass micro-electromechanical structure (MEMS) process and the method includes forming recesses on a glass substrate everywhere th... | 05/03/2005 |
| 6885334 | Methods and systems for detecting forward obstacles Methods and apparatus for detecting obstacles in the flight path of an air vehicle are described. The air vehicle utilizes a radar altimeter incorporating a forward looking antenna and an electronic digital elevation map to provide precision terrain aided navigation... | 04/26/2005 |
| 6865944 | Methods and systems for decelerating proof mass movements within MEMS structures A micro-electromechanical systems (MEMS) device is described which includes a substrate having at least one anchor, a proof mass having either of at least one deceleration extension extending from the proof mass or at least one deceleration indentation formed in the... | 03/15/2005 |
| 6860023 | Methods and apparatus for automatic magnetic compensation A method for characterizing distortions in the earth's magnetic field caused by a vehicle having a magnetometer affixed therein is described. The method includes repeatedly measuring the distorted magnetic field utilizing the magnetometer and obtaining a three-dimen... | 03/01/2005 |
| 6860151 | Methods and systems for controlling movement within MEMS structures A method for reducing undesired movements of proof masses in micro-electromechanical systems (MEMS) devices is described where the proof masses are suspended above a substrate by one or more suspensions. The method includes providing an anchor on the substrate subst... | 03/01/2005 |
| 6856279 | Methods and apparatus for determining an interferometric angle to a target in body coordinates A method for processing radar return data to determine a physical angle, in aircraft body coordinates to a target, is disclosed. The radar return data includes a phase difference between radar return data received at an ambiguous radar channel and a left radar chann... | 02/15/2005 |
| 6836707 | Methods and systems for determining heave and heave rate of vessels A method for determining heave and heave rate for a vessel is described. The vessel includes an inertial navigation system (INS), and sensors for the INS being located at a point A of the vessel, the vessel having a zero heave reference point B, and the described me... | 12/28/2004 |
| 6831599 | Remote velocity sensor slaved to an integrated GPS/INS A unit is configured to provide acceleration, velocity, and position information for one or more points on a vehicle. The unit includes an integrated global positioning satellite system (GPS)/inertial navigation system (INS) and at least one remote velocity sensor. ... | 12/14/2004 |
| 6826502 | Methods and systems for calibration and compensation of accelerometers with bias instability A method for determining compensation coefficients for accelerometers which exhibit bias transients is described. The method comprises estimating bias accumulation from measured accelerometer outputs, determining a corrected accelerometer output, and determining the... | 11/30/2004 |
| 6817244 | Methods and systems for actively controlling movement within MEMS structures A method for reducing effects of common mode oscillations between two respective proof masses in micro-electromechanical systems (MEMS) devices is described. The MEMS devices also include a motor pickoff comb, a sense plate, and a motor drive comb for each proof mas... | 11/16/2004 |
| 6770504 | Methods and structure for improving wafer bow control A method for controlling bow in wafers which utilize doped layers is described. The method includes depositing a silicon-germanium layer onto a substrate, depositing an undoped buffer layer onto the silicon-germanium layer, and depositing a silicon-baron layer onto ... | 08/03/2004 |
| 6768469 | Methods and apparatus for radar signal reception An antenna is described which includes first, second, and third conductive layers and a first and second laminate to separate the layers. The laminates are configured with plated through holes to provide contact between the first and third layers, the holes defining... | 07/27/2004 |
| 6753806 | Methods and apparatus to compensate for zero Doppler returns A method for simulating a Doppler signal under stationary conditions is described. The method includes sampling a radar return signal at an integer multiple of the return signal frequency plus a fraction of the return signal period and generating a base band signal ... | 06/22/2004 |
| 6750807 | Radar altimeter with forward obstacle avoidance capabilities A radar altimeter is described which includes a transmitter for transmitting a radar signal, a receiver for receiving the reflected radar signal, and at least one antenna coupled to one or both of the transmitter and receiver. The altimeter also includes a forward f... | 06/15/2004 |
| 6744397 | Systems and methods for target location A method of determining a target location from a vehicle is described. The method includes identifying the target utilizing a video system, determining an angular location vector to the target with respect to the vehicle, determining a position of the vehicle utiliz... | 06/01/2004 |
| 6744401 | Methods and apparatus for radar data processing A method for testing a radar system utilizing flight test radar data is described. The method includes time synchronizing measured radar data with a GPS based time marker, storing at least a portion of the time synchronized radar data, storing the GPS data, processi... | 06/01/2004 |
| 6738563 | Methods and apparatus for weighting radar return data A method for reducing effects of terrain return fading due to summation of out of phase radar returns in determining locations of radar targets is described. The method comprises determining an interferometric angle, Φ, to a radar target based on at least one radar... | 05/18/2004 |
| 6734820 | Methods and apparatus for conversion of radar return data An in-phase/quadrature component (IQ) mixer is configured to reject returns from a negative doppler shift swath in order to mitigate corruption of returns of a positive doppler shift swath. The mixer includes a sample delay element which produces a quadrature compon... | 05/11/2004 |
| 6731236 | Methods and apparatus for optimizing interferometric radar altimeter cross track accuracy An apparatus for calibrating a radar altimeter is described. The altimeter provides an angle to a target based on radar energy received at right, left, and ambiguous antennas. The apparatus comprises a turntable on which the radar is mounted, a turntable controller ... | 05/04/2004 |
| 6731234 | Radar anti-fade systems and methods A method for suppressing ground return radar fading in a radar altimeter is described. The method includes providing a radar gate width which corresponds to an area that is smaller than an antenna illumination area being impinged by transmissions of the radar altime... | 05/04/2004 |
| 6725169 | Methods and apparatus for automatic gain control An apparatus for controlling an amplitude of a signal generated from a digitized sinusoid of rapidly and widely varying amplitude is described herein. The apparatus includes a two stage gain adjuster which produces a gain adjusted signal, a phase shifter which conve... | 04/20/2004 |
| 6718825 | Methods and systems for reducing stick-down within MEMS structures A method for reduces the sticking of proof masses in micro-electromechanical systems (MEMS) devices to sense plates in the MEMS device due to acceleration forces to which the MEMS device is subjected. The method includes determining a beginning of acceleration event... | 04/13/2004 |
| 6714866 | Methods and apparatus for installation alignment of equipment A method for installation alignment of an inertial reference unit (IRU) with vehicle axes when the IRU is installed within the vehicle is provided. The vehicle axes include roll, pitch, and yaw axes. The method includes recording vehicle angular position data includ... | 03/30/2004 |
| 6680691 | Methods and apparatus for accurate phase detection A phase processor is disclosed which is configured to receive processed radar return data from a left radar channel, a right radar channel, and an ambiguous radar channel. The phase processor comprises a plurality of phase detectors each with an input and... | 01/20/2004 |
| 6674397 | Methods and apparatus for minimum computation phase demodulation A filter, includes a first order band pass filter configured to process non-zero amplitude gated radar return samples and process a portion of received zero amplitude return samples. The filter also calculates past filter outputs based on filter outputs g... | 01/06/2004 |
| 6639545 | Methods and apparatus to determine a target location in body coordinates A method for determining a position of a doppler radar target in aircraft body coordinates is described. The method includes calculating values for doppler circle equations, in doppler coordinates, based upon a range to the target, a vehicle velocity, and... | 10/28/2003 |
