Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 7409293 | Methods and systems for enhancing accuracy of terrain aided navigation systems A navigation system is described which includes a navigation processor, an inertial navigation unit configured to provide a position solution to the navigation processor, and a digital elevation map. The described navigation system also includes a radar altimeter ha... | 08/05/2008 |
| 7295151 | Systems and methods for self-test of a radar altimeter Systems and methods for testing a signal generated by a Direct Digital Synthesizer (DDS) in a radar altimeter. In an embodiment of the method, a voltage signal derived by comparing a fixed reference frequency to a ramped frequency signal generated by the DDS based o... | 11/13/2007 |
| 7295150 | Methods and systems for identifying high-quality phase angle measurements in an interferometric radar system A method for determining a mechanical angle to a radar target utilizing a multiple antenna radar altimeter is described. The method comprises receiving radar return signals at the multiple antennas, populating an ambiguity resolution matrix with the electrical phase... | 11/13/2007 |
| 7248342 | Three-dimension imaging lidar This invention is directed to a 3-dimensional imaging lidar, which utilizes modest power kHz rate lasers, array detectors, photon-counting multi-channel timing receivers, and dual wedge optical scanners with transmitter point-ahead correction to provide contiguous h... | 07/24/2007 |
| 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 |
| 7172119 | Modular architecture sensing and computing platform A weather resistant modular sensor and computing platform reduces costs and enhances versatility of sensor systems. Rapidly evolving electronic technology results in hyper-obsolescence wherein sensor systems that are state of the art technology when designed, fall b... | 02/06/2007 |
| 7161527 | Navigation system A radar altimeter system with a closed-loop modulation for generating more accurate radar altimeter values. The present invention combines flight safety critical sensors into a common platform to permit autonomous or semi-autonomous landing, enroute navigation and c... | 01/09/2007 |
| 7138940 | Method and systems for automatic zero calibration of radar altimeters A method for operating a radar altimeter to perform a zero altitude calibration is described. The method includes determining a difference between an altitude measured by the radar altimeter and a desired altitude indication and upon receiving a zero calibration com... | 11/21/2006 |
| 7130449 | Method and system for ground imaging A system and method for determining the slope of a ground imaged area. The system includes a camera, a memory, and a processor. The camera generates a first and a second image of an area of ground from an aircraft. The memory stores bi-directional characteristic inf... | 10/31/2006 |
| 7095364 | Altitude measurement system and associated methods An altitude measuring system and method for aircraft is provided. The altitude measuring system includes altitude sensors for providing data to an altitude processing unit. The altitude processing unit spatially averages each output to determine a mean altitude. Pit... | 08/22/2006 |
| 7057549 | Method and apparatus for predictive altitude display Embodiments of the invention provide a method and apparatus for indicating aircraft height relative to an obstruction in a terrain awareness warning system. The method includes receiving data indicative of geographic features of an obstruction, lateral distance of t... | 06/06/2006 |
| 7009553 | Device and method for alert and density altitude features in a transponder A transponder having a subsystem for providing an altitude alert function signifying a deviation from a set altitude is described. The subsystem includes an input for receiving an altitude deviation limit associated with the set altitude, a CPU receiving updated alt... | 03/07/2006 |
| 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 |
| 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 |
| 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 |
| 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 |
| 6593875 | Site-specific doppler navigation system for back-up and verification of GPS A system and method for identifying the position of an airborne platform on a flight path includes at least three radar transceivers that are directed along respective beam paths to generate return signals. Each of the return signals respectively indicate... | 07/15/2003 |
| 6362776 | Precision radar altimeter with terrain feature coordinate location capability A radar altimeter for determining altitude of an air vehicle comprises a transmitter for transmitting radar signals toward the ground. A first and a second antenna receive reflected radar signals from the ground. A signal processor is coupled to the first... | 03/26/2002 |
| 6204779 | Combined altitude and height-above-ground indicator for an aircraft A combined altitude and height-above-ground indicator for an aircraft includes a first sensor and a second sensor which respectively sense altitude and height-above-ground, a processor for processing the information supplied by the first and second sensor... | 03/20/2001 |
| 5923283 | Altimetric type measurement method for use on a satellite An altimetric type measurement method for use on a satellite transmits a pulse towards the surface of the sea and carries out frequency transformation on the return signal resulting from the reflection of this pulse at the surface of the sea. This produce... | 07/13/1999 |
| 5736957 | Delay compensated doppler radar altimeter A delay compensated Doppler radar altimeter which eliminates the relative delay curvature associated with the energy reflected by a scatterer located in the along-track direction of an aerial platform for which a most accurate estimation of scatterer elev... | 04/07/1998 |
| 5719582 | Software/hardware digital signal processing (DSP) altimeter A radar altimeter system uses a microprocessor-based subsystem to process radar signals in software. The subsystem includes a track loop and a verify loop for digital signal processing of the radar signals. The track loop generates a gate pulse and integr... | 02/17/1998 |
| 5410317 | Terrain clearance generator A terrain clearance signal generator particularly usable with ground proximity warning systems provides a signal representative of terrain clearance when the radio altimeter signal is unreliable, such as in the case of excessive pitch or roll, out of trac... | 04/25/1995 |
| 5136301 | Primary flight display system having a vertical linear altimeter A primary flight display having a vertically oriented linear scale format altimeter therein which includes a non-numbered coarse tape-like image area, for displaying markings relating to altitude and a fine scale tape-like image area juxtaposed with said ... | 08/04/1992 |
| 5109230 | Method for aircraft velocity error detection with a Doppler radar A method for preventing errors in the Doppler radar measurement of velocity in aircraft that result from the radar receiver being locked to backscatter from side lobes of a plurality of main lobes radiated in a fixed radiation geometry. The inertial verti... | 04/28/1992 |
| 5047779 | Aircraft radar altimeter with multiple target tracking capability An aircraft radar altimeter includes a programmed microcontroller which permits effective simultaneous tracking of at least two targets such that, for example, both ground and obstacles on the ground can be simultaneously tracked, thus avoiding crashes wh... | 09/10/1991 |
| 4894659 | Radar altimeter systems An aircraft microwave altimeter system has a threshold detector with two parallel channels that provide two sets of output signals at two different levels of sensitivity. The signals at the higher sensitivity are supplied to a display whereas those at the... | 01/16/1990 |
| 4174520 | Radar altimeter for tropical areas A radar altimeter system for measuring, from an aircraft flying above tropical forest areas, the height of the ground and the height of the forest canopy above the ground comprising a transmitter, a receiver for detecting return pulses from the ground and... | 11/13/1979 |
