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| Number | Title | Issue Date |
| 7952515 | Range gated holographic radar Narrow virtual transmit pulses are synthesized by differencing long-duration, staggered pulse repetition interval (PRI) transmit pulses. PRI is staggered at an intermediate frequency IF. Echoes from virtual pulses form IF-modulated interference patterns with a refer... | 05/31/2011 |
| 7436351 | Multipath resolving correlation interferometer direction finding Apparatus and a method utilizing correlation interferometer direction finding for determining the azimuth and elevation to an aircraft at long range and flying at low altitudes above water with a transmitting radar while resolving multipath signals. The signals from... | 10/14/2008 |
| 7417586 | Methods and systems for interferometric cross track phase calibration A method to compensate for variances in signal path delays for a plurality of radar return processing channels is described. The method comprises providing a signal in the signal path between an antenna and a corresponding receiver of each radar return processing ch... | 08/26/2008 |
| 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 |
| 7358891 | Multipath resolving correlation interferometer direction finding Apparatus and a method utilizing correlation interferometer direction finding for determining the azimuth and elevation to an aircraft at long range and flying at low altitudes above water with a transmitting radar while resolving multipath signals. The signals from... | 04/15/2008 |
| 7333046 | System and method for monitoring targets A system comprising a moving radar, a processing device, and a phase difference determination device is used to monitor a target. The moving radar has first and second phase centers that transmit and receive signals normal to a direction of movement of the radar. Th... | 02/19/2008 |
| 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 |
| 7292179 | Instantaneous passive range finding A method and apparatus for use in determining the range in a single time sample from a platform to a target are disclosed. The method includes receiving radiation emanating from the target at two points on the platform in a common time sample; detecting the received... | 11/06/2007 |
| 7274332 | Multiple evaluators for evaluation of a purality of conditions A system and method is disclosed for locating people or objects. In particular, a system and method for locating a wireless mobile station using a plurality of mobile station location estimators is disclosed. The system is useful for 911 emergency calls, tracking, r... | 09/25/2007 |
| 7176829 | Microwave sensor In one embodiment of a microwave sensor, when a “low” plants countermeasure is conducted, if an alert has been generated 5 times or more within 1 minute, an object decision move distance is changed to be longer and a “high” plants countermeasure is conducted... | 02/13/2007 |
| 7167126 | Radar system and method for determining the height of an object System and method for determining the height of an object reflecting a real beam radar signal by receiving the reflected signal with a first and second vertically spaced antennas. Receivers provide two signals indicating the phase of the reflected signals received b... | 01/23/2007 |
| 7158078 | Positioning of mobile wireless terminal An apparatus for determining a position of a mobile wireless station comprises means for determining the position of the mobile wireless station in accordance with a position of a first reference wireless station, a position of a second reference wireless station, a... | 01/02/2007 |
| 7088765 | Vector calibration system An exemplary signal processing system determines vector mismatch between a plurality of signal paths. Advantageously, the system can determine mismatch across a range of frequencies. A signal generator of the system can provide a periodic calibration signal having a... | 08/08/2006 |
| 7026990 | Interferometer arrangement for unambiguous determination of an angle of incidence of incident electromagnetic radiation An interferometer arrangement includes an antenna array that receives radiation from a plane wave emitted by a transmitter, the radiation being incident on the array at an angle (θ). The array includes a plurality of antennas that provide output signals to a switch... | 04/11/2006 |
| 7023380 | RF attitude measurement system and method A simple RF system tracks a missile, bullet or artillery round and determines the instantaneous attitude of the spinning projectile while in flight. The system is particularly useful in command-guided weapons systems where line-of-sight is maintained from the launch... | 04/04/2006 |
| 6982668 | Tangential velocity measurement using interferometric MTI radar Radar systems use time delay measurements between a transmitted signal and its echo to calculate range to a target. Ranges that change with time cause a Doppler offset in phase and frequency of the echo. Consequently, the closing velocity between target and radar ca... | 01/03/2006 |
| 6952181 | Locating a mobile station using a plurality of wireless networks and applications therefor A location is disclosed for wireless telecommunication infrastructures. The systems output requested locations of hand sets or mobile stations (MS) based on, e.g., AMPS, NAMPS, CDMA or TDMA communication standards. The system determines both local MS locations, and ... | 10/04/2005 |
| 6930638 | Passive moving object detection system and method using signals transmitted by a mobile telephone station A passive object detection system (1) comprises first and second antennas (4, 6) and a processor (8). The first antenna (4) is adapted to receive a signal transmitted by a mobile telephone base station; the second antenna (6) is ad... | 08/16/2005 |
| 6911931 | Using dynamic interferometric synthetic aperature radar (InSAR) to image fast-moving surface waves A new differential technique and system for imaging dynamic (fast moving) surface waves using Dynamic Interferometric Synthetic Aperture Radar (InSAR) is introduced. This differential technique and system can sample the fast-moving surface displacement waves from a ... | 06/28/2005 |
| 6911932 | Two antenna, two pass interferometric synthetic aperture radar A multi-antenna, multi-pass IFSAR mode utilizing data driven alignment of multiple independent passes can combine the scaling accuracy of a two-antenna, one-pass IFSAR mode with the height-noise performance of a one-antenna, two-pass IFSAR mode. A two-antenna, two-p... | 06/28/2005 |
| 6867728 | Methods and systems for identifying signals-of-interest Signals-of-interest are identified by distinguishing such signals from signals constituting environmental or internal receiver noise. A received signal is rapidly sampled in order to set a dynamic, system threshold. Signals above the threshold constitute signals-of-... | 03/15/2005 |
| 6864828 | Method and apparatus for collection and processing of interferometric synthetic aperture radar data A system and method provide for the collection of interferometric synthetic aperture radar (IFSAR) data. In the system, a first space vehicle configured for emitting electro-magnetic energy and collecting the reflection from a region of interest (ROI), may be direct... | 03/08/2005 |
| 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 |
| 6844786 | Millimeter- and submillimeter-wave noise generator A noise generator for generating multi-octave, high-level, millimeter- and submillimeter-wave noise is disclosed. According to one embodiment of the invention, the noise generator includes: a microwave noise source; a microwave power-amplifier chain; a level-set att... | 01/18/2005 |
| 6839017 | Method and apparatus for using anti-jam technology to determine the location of an electromagnetic radiation source A system employs null angle measurements developed in response to the detection of radiation, such as jamming, along with the positions at which the null angles are measured, to determine the location of the radiation source through reverse triangulation. ... | 01/04/2005 |
| 6791493 | Method for using signal frequency change to differentially resolve long baseline interferometer measurements A method of and apparatus for passively determining agile-frequency-emitter location and computer-readable medium bearing instructions therefor. Unless a specified accuracy threshold is met or exceeded, phase, frequency, and baseline position are measured during a s... | 09/14/2004 |
| 6784826 | Body motion tracking system Methods and apparatus are disclosed for measuring position and motion of a “marker” antenna (14), disposed on a subject (12) at a physical location to be tracked. Relative distance of the marker antenna (14) from receiving antennas (18 | 08/31/2004 |
| 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 |
| 6741202 | Techniques for 3-dimensional synthetic aperture radar The height of a radar target above a horizontal plane at a location within the horizontal plane is measured using a synthetic aperture radar (SAR). The synthetic aperture radar is mounted on a moving platform. The moving platform moves along a continuous climbing pa... | 05/25/2004 |
| 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 |
| 6720911 | Method and apparatus for reducing the amount of shipboard-collected calibration data A system is provided for reducing the time that a ship must be maintained on station to collect calibration data by reducing the frequencies at which calibration data is to be collected. Since it is impractical to consider calibrating over elevation angle and polari... | 04/13/2004 |
| 6697012 | Altitude estimation system and method A system and method for detecting and tracking a target object, including the calculation of the target object's altitude, is disclosed. During the processing of signals received by a receiver, the system selectively calculates the altitude of the target ... | 02/24/2004 |
| 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 |
| 6677884 | Satellite configuration for interferometric and/or tomographic remote sensing by means of synthetic aperture radar (SAR) For interferometric and/or tomographic remote sensing by means of synthetic aperture radar (SAR) one to N receiver satellites and/or transmitter satellites and/or transceiver satellites with a horizontal across-track shift the same or differing in amplitu... | 01/13/2004 |
| 6661368 | Control of reflected electromagnetic fields at an IFSAR antenna A system for reducing multi-path reflections from adjacent metal objects which cause distortion in an IFSAR includes a reflective cone extending between the top of the IFSAR and the skin of its aircraft, and a reflective shroud surrounding the IFSAR. Each... | 12/09/2003 |
| 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 |
| 6618002 | HF radar A HF radar uses the same antenna array (414, 424, 424', 424') for both transmission (TX) and reception (RX). Each radiating element of the array may be driven by its own local transmitter and may have its own local receiver, both being connected to a cent... | 09/09/2003 |
| 6525685 | Method and apparatus for detecting and eliminating signal angle-of-arrival errors caused by multipath This present invention advantageously eliminates the critical deficiencies of current multipath interferometer processing demonstrated in field testing. In particular the present invention substantially improves AOA estimation accuracy and reliability whe... | 02/25/2003 |
| 6421008 | Method to resolve interferometric ambiguities A method for resolving interferometric ambiguities for an interferometer system with antenna elements employs multiple interferometric elements within the baseline. The overall accuracy of the interferometer system results from the interferometric element... | 07/16/2002 |
| 6411249 | Apparatus and method for the monopulse linking of frequency agile emitter pulses intercepted in on single interferometer baseline Disclosed is a method of associating a single pulse from an agile emitter with previously detected pulses from that emitter in a time interval less than the pulse repetition interval (PRI) of the radar. Ambiguous phases from the previously detected pulses... | 06/25/2002 |
