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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 8131465 | Motion detection for tracking An apparatus and method for tracking a target wherein a new position fix is taken when the measured movement of the target is more than a predetermined threshold amount or when the position fix has not been updated in a predetermined interval. The apparatus and meth... | 03/06/2012 |
| 8024119 | Systems and methods for gyrocompass alignment using dynamically calibrated sensor data and an iterated extended kalman filter within a navigation system A navigation system and method for gyrocompass alignment in a mobile object. The system includes an inertial measurement device configured to provide a first set of sensor data and a positioning unit configured to provide a second set of data. In an example embodime... | 09/20/2011 |
| 8019543 | Methods for determining an initial AINS heading Two methods for determining a best initial heading estimate for use in an AINS system, while recording position data values and in-motion data values, assigning incremental changes to indexed heading ψk, calculating a set of time indexed present AINS pos... | 09/13/2011 |
| 7983842 | Vehicular present position detection apparatus and program storage medium There is a need for improving the accuracy of estimating a gain error for an angular velocity sensor. An error estimation section and a correction section are provided as well as a gyroscope that detects an angular velocity of a vehicle. The error estimation section... | 07/19/2011 |
| 7831389 | Map evaluation system and map evaluation method An absolute position detector of a navigation device detects an absolute position of a vehicle. An on-map position of the vehicle is acquired based on the detected absolute position to be on a road map indicated by map data stored in the navigation device. Absolute ... | 11/09/2010 |
| 7761233 | Apparatus and method for measuring the accurate position of moving objects in an indoor environment An apparatus and method is disclosed for efficiently sensing and tracking objects in an indoor environment by simultaneously measuring the object movement with an inertial navigation system and a reference location positioning system. By combining the measurements o... | 07/20/2010 |
| 7756640 | Vehicle control system, vehicle control method, and vehicle control program A vehicle control system includes a route setting unit for setting a route from a start point to a destination; an information obtaining unit for obtaining from a memory position information of at least one base point and at least one control point existing in the r... | 07/13/2010 |
| 7689357 | Closed loop hybridising device with monitoring of the measurement integrity The invention relates to a closed loop hybridizing device comprising a Kalman filter bank, a virtual platform, a device to calculate pseudo-measurements estimated a priori. The Kalman filter bank comprises a principal Kalman filter adapted to the calculation of corr... | 03/30/2010 |
| 7509216 | Inertial navigation system error correction Methods and apparatus for: (a) the correction of one or more elements determined from a first set of continuous gyro and accelerometer measurements comprising using a second set of discontinuously measured higher accuracy accelerometer measurements doubly integrated... | 03/24/2009 |
| 7440830 | Driving support system based on driver visual acquisition capacity In a driving support system, a necessary information amount determining section determines the amount of visual information necessary for safe driving. An information acquisition capacity setting section sets an information acquisition capacity of a driver. A compar... | 10/21/2008 |
| 7437242 | Navigation apparatus A navigation apparatus mounted on a vehicle is equipped with a first gyro sensor and a second gyro sensor arranged in symmetry with respect to a first axis in a travel direction of the vehicle and to a second axis that passes through the center of gravity of the veh... | 10/14/2008 |
| 7437230 | Satellite based vehicle guidance control in straight and contour modes A method for steering an agricultural vehicle comprising: receiving global positioning system (GPS) data including position and velocity information corresponding to at least one of a position, velocity, and course of the vehicle; receiving a yaw rate signal; and co... | 10/14/2008 |
| 7421343 | Systems and methods for reducing vibration-induced errors in inertial sensors Systems and methods for reducing vibration-induced bias errors in inertial sensors are disclosed. A system for reducing bias errors in an inertial sensor operating within an environment may include a vibration detector for sensing vibration changes within the enviro... | 09/02/2008 |
| 7386395 | Systems and methods for shock compensation utilizing an adaptive control technique algorithm A method for providing dynamic disturbance compensation to an inertial system is described. The method includes determining estimated correction factors based on received acceleration components, and dynamically determining filter coefficients for a filter configure... | 06/10/2008 |
| 7363717 | System and method for using rotation sensors within a borehole A system and method for using a survey tool within a borehole is provided. The survey tool includes a plurality of rotation sensors each having a sensing axis and a direction of least acceleration sensitivity. The sensing axes of the plurality of rotation sensors ar... | 04/29/2008 |
| 7366612 | Method and apparatus for compensating attitude of inertial navigation system and method and apparatus for calculating position of inertial navigation system using the same Provided are a method and apparatus for compensating an attitude of an inertial navigation system and a method and apparatus for calculating a position of the inertial navigation system using the same. The method of compensating an attitude of the inertial navigatio... | 04/29/2008 |
| 7353614 | Vehicle compass system with continuous automatic calibration The compass system of the present invention utilizes an improved calibration routine in which a processing circuit of the compass recalibrates the compass each time three data points are obtained from a magnetic field sensor that meet predetermined criteria. One suc... | 04/08/2008 |
| 7346450 | Vehicle navigation apparatus for controlling map-matching areas A stop area is set in an arbitrary area where map matching processing is to be stopped, by an operation switch group or a remote controller. When a vehicle enters the stop area, the map matching processing is stopped, and when the vehicle exits from the stop area, t... | 03/18/2008 |
| 7337549 | Input device for using geomagnetic sensor and a method thereof for generating input signal An input device using a geomagnetic sensor includes a geomagnetic sensor outputting a voltage corresponding to geomagnetism, and a control part calculating an azimuth using the voltage output from the geomagnetic sensor and calculating the rotation angle by comparin... | 03/04/2008 |
| 7336963 | Method and system for delivering location information through a voice messaging system A method and system for delivering location information through a voice messaging system is provided. A mobile subscriber may be directed to a voice messaging system if a party is unavailable or chooses not to accept the call. The mobile subscriber may indicate to t... | 02/26/2008 |
| 7310577 | Integrated capacitive bridge and integrated flexure functions inertial measurement unit An inertia control system includes an integrated inertial measurement unit coupled to an inertial platform. The integrated inertial measurement unit includes three accelerometer gimbals/axes (first, second, and third) respectively, each including a pair of flexure p... | 12/18/2007 |
| 7305303 | Personal navigation using terrain-correlation and/or signal-of-opportunity information A navigation system includes an inertial navigation unit. The navigation system also includes a Kalman filter that generates corrective feedback for use by the inertial navigation unit. The Kalman filter generates the corrective feedback as a function of at least on... | 12/04/2007 |
| 7305147 | Zooming method The invention relates to the field of methods for zooming onto a part of an image which consists of pixels and which represents a terrain overflown by an aircraft. It is a zoom method for zooming onto a part of an image which consists of pixels and which represents ... | 12/04/2007 |
| 7280897 | Intervisibility determination A system and method for efficient intervisibility determination. The intervisibility determination method of the present invention provides a multiple threat processing capability within a specified area of terrain using a common database. Computation is simplified ... | 10/09/2007 |
| 7280916 | Method and apparatus for compensating for acceleration errors and inertial navigation system employing the same Provided are a method and apparatus for compensating for an acceleration error in an inertial navigation system (INS). The apparatus includes a motion detector that detects the motion of the INS and outputs information on stationary time intervals during which the I... | 10/09/2007 |
| 7277047 | Reduced state estimation with biased measurements This invention relates to sate estimation after processing measurements with unknown biases that may vary arbitrarily in time within known physical bounds. These biased measurements are obtained from systems characterized by state variables and by multidimensional p... | 10/02/2007 |
| 7266446 | Helmet mounted tracking system and method A helmet mounted tracking system for target designation includes an airplane azimuth sensor, a helmet mounted azimuth sensor, an airplane pitch sensor, a helmet mounted pitch sensor, and a processor. The airplane azimuth sensor determines an azimuth heading for an a... | 09/04/2007 |
| 7260896 | Electronic compass and method of calibration An electronic compass assembly includes a first collection portion and a second collection portion that each collect magnetic field data. The magnetic field data collected by the second collection portion partially overlaps the magnetic field data collected by the f... | 08/28/2007 |
| 7251493 | Mobile terminals and methods for determining a location based on acceleration information An acceleration measurement circuit is calibrated based on wireless communication signals that are received by a mobile terminal. A location of the mobile terminal is then determined using the calibrated acceleration measurement circuit. ... | 07/31/2007 |
| 7219013 | Method and system for fault detection and exclusion for multi-sensor navigation systems A new Fault Detection and Exclusion (FDE) approach for tightly integrated GPS/inertial sensors that combines a normalized solution separation for fault detection and a residual monitoring scheme for fault exclusion is described. The computation of the detection thre... | 05/15/2007 |
| 7180443 | Reduced state estimator for systems with physically bounded parameters State estimation of a system having multidimensional parameters, which are unknown, arbitrarily time-varying, but bounded, in addition to state variables, is performed by initializing the state estimate and matrices representing its covariance and bias coefficients ... | 02/20/2007 |
| 7165123 | Apparatus and method for I/O management in a mobile environment wherein access to data from a wireless signal is restricted based on a persistent unique hardware identification The present invention provides an apparatus and method for a robust and configurable mobile computer architecture with navigation computational capabilities. The present invention further provides a bus network which allows for an efficient and durable Input/Output ... | 01/16/2007 |
| 7133776 | Attitude alignment of a slave inertial measurement system A method for attitude alignment of a slave inertial measurement system connected to a rotationally mobile platform supported by a vehicle that is stationary relative to a reference navigation frame comprises the steps of mounting a master reference inertial measurem... | 11/07/2006 |
| 7130744 | Method for determining and compensating the scale factor error caused by a wavelength change in a GPS-based inertial navigation system In a GPS-supported inertial attitude and heading reference system equipped with a Kalman correction filter and a multiple axis fiber optic gyroscope, the invention provides for only that scale factor error which is determined for the measurement axis (e.g. the verti... | 10/31/2006 |
| 7120522 | Alignment of a flight vehicle based on recursive matrix inversion A method for recursively determining alignment of a flight vehicle during flight is provided. The method includes generating data in a reference coordinate frame and in a second coordinate frame at a plurality of points in time during the flight, recursively generat... | 10/10/2006 |
| 7107833 | Inertial reference unit with internal backup attitude heading reference system An inertial reference unit (IRU) is described which includes a processor programmed to provide inertial data from received inertial signals, a primary sensor unit providing the inertial signals to the processor, and an input/output (I/O) unit communicatively coupled... | 09/19/2006 |
| 7107146 | Methods and systems for generating a terrain elevation map in a cartesian format Methods, systems, and computer program products for re-sampling terrain data in a vehicle from latitude/longitude format into a Cartesian format. The present invention permits incremental updates of the terrain elevation map as the vehicle travels. The present inven... | 09/12/2006 |
| 7103477 | Self-calibration for an inertial instrument based on real time bias estimator An exemplary inertial measurement apparatus incorporates self-calibrating bias correction signals. First and second inertial instruments generate respective input signals representative of an inertial attribute to be measured. A bias estimator generates first and se... | 09/05/2006 |
| 7084871 | Method for synthesizing an intervisibility image The invention relates to the field of methods for synthesizing an intervisibility image consisting of pixels and representing the distribution, over a terrain overflown by an aircraft, of the intervisibility zones. This is a method of synthesizing an intervis... | 08/01/2006 |
| 7075459 | Vehicle speed sensor for navigation system A vehicle navigation system includes a vehicle displacement sensor comprising a wireless transmitter generating a signal indicating rotational displacement of a vehicle component. A complementary wireless transmitter receives the signal from the transmitter. A compu... | 07/11/2006 |
