Raytheon Company

Hughes Aircraft Company

The Boeing Company

Other

Hughes Electronics Corporation

Hughes Aircraft

Kirk K Kohnen

Eric K Slater

Wilbur W Eaton

Harold C Gilbert

Michael Rakijas

Anthony Saglembeni

Mark Andrew Lundgren

Ketao Liu

Paul L Feintuch

John Y Liu

Ray E McVey

Gregory S Becker

Richard W Guthrie

Douglas Bender

Peter J Sedivec

Stanley O Aks

James William Casalegno

Billy Fitzgibbons

Robert Prohaska

Frank Philip Monte

James W Casalegno

Method and system to encrypt and decrypt data is provided. The method comprising, providing input data to be encrypted, said input data made up of a plurality of sub-data, each said sub-data comprising sequence of bits of data; dynamically selecting a plurality of invertible encryption parameters; and performing one or more rounds of a combination of data modification, sequence modification and data-sequence modification using plurality of selected encryption parameters deriving encrypted data. The system includes a processor for executing code for dynamically selecting a plurality of invertible encryption parameters.

High speed configurable cryptographic architecture

Systems and techniques for laser metrology. Two or more fanned probe beams are scanned relative to a surface including one or more targets. A position detection module receives return beam information from the fanned probe beams, and determines a position of at least a first target of the one or more targets based on the return beam information.

Multiple fanned laser beam metrology system

An method, apparatus and article of manufacture for detecting and correcting memory device failures includig detecting errors in data stored in a memory device from the data transacted with a processor, correcting the detected errors in the data transacted with the processor, tracking the detected errors in the memory device, determining when the memory device has failed based upon the tracked detected errors and resetting the memory device when the memory device fails testing, and further, identifying erroneous latch-ups detected soon after powering and correcting errors such that no erroneous data is transacted with the processor.

Detecting and mitigating memory device latchup in a data processor

An analog-to-digital converter system for sampling an input signal includes at least one offset channel. Each channel includes a differential amplifier with a signal input coupled to the input signal, an offset input for receiving an offset signal and an amplified difference output, an analog-to-digital converter having a signal input coupled to the amplified difference output and having a signal output, and an offset index signal source coupled to the differential amplifier offset input. The system further includes an offset controller having at least one output coupled to a corresponding at least one offset index signal source and at least one input coupled to a corresponding at least one analog-to-digital converter signal output. The system also includes a signal constructor having at least one input coupled to a corresponding at least one analog-to-digital converter signal output and operable to provide a relatively high resolution digital output signal.

High resolution, high dynamic range analog-to-digital converter system and related techniques

A fault tolerant integrated circuit employs triple redundant storage of data and continuous voting to protect the data from Single Event Upset, or SEU. The integrated circuit includes three or more registers and a majority voter. The three registers are connected in series to each other with the output of the first register being connected to the input of the second register and the output of the second register being connected to the input of the third register. The majority voter is connected to the output of each register and generates a signal corresponding to the majority of all of the register outputs. The output of the majority voter is connected to the input of the first register, thereby correcting any incorrect data stored in the registers.

Triple redundant self-scrubbing integrated circuit

Methods including a Kalman filter tracking method for localizing a magnetic field source and which employs a linear perturbation method. The linear perturbation method linearizes an objective function in the neighborhood of the actual source enabling the source location to be computed in a single operation. Successive applications of the linear perturbation method lead to successive improvements in the localization result.

Linear perturbation method for Kalman filter tracking of magnetic field sources

A magnetic object tracking algorithm, that may be implemented as an apparatus or a method, that permits kinematic tracking of magnetized objects, or targets, using magnetic field strength measurements derived from one or more vector magnetometers. The magnetic object tracking algorithm effectively tracks a maneuvering magnetic dipole target using an extended Kalman filter directly observing (processing) real magnetic field strength data.

Magnetic object tracking based on direct observation of magnetic sensor measurements

A system for passively sensing low frequency (5 Hz to 50 kHz) EM emanations from vehicles and classifying them on that basis. A temporal frequency response is computed for the sensed EM emanations. Harmonic, non-harmonic and temporal features are extracted from the response and used to classify the vehicle. In the preferred embodiment, the temporal frequency response is displayed as a time, frequency and intensity plot, from which a technician visually extracts these features. The features can then be used either to determine a 'signature' for classifying the vehicle or to determine specific characteristics which, in turn, can be used to classify the vehicle. Alternately, the feature extraction and classification can be performed by an automated classifier.

Passive vehicle classification using low frequency electro-magnetic

An improved digital fluxgate magnetometer that uses digital logic and a high resolution digital to analog converter to digitize a magnetic signal for use by signal processing algorithms. The magnetometer includes an oscillator that outputs an oscillator signal and a magnetic fluxgate sensor having a drive coil coupled to the oscillator, a feedback coil, and a sense coil. An analog multiplier is coupled to the sense coil and the oscillator and outputs a signal to an analog low pass filter. A comparator is coupled to the analog multiplier, and a register is coupled to the comparator and outputs a logical 1 or a logical 0 in accordance with the output of the comparator. A digital filter receives the output of the register and produces a digital output of the digital fluxgate magnetometer. A high resolution digital to analog converter is coupled between the register and the feedback coil of the magnetic fluxgate sensor in a feedback loop of the sensor. The digital to analog converter produces a very high resolution digitized output (typically &gt;22 bits) that is necessary to adequately represent the dynamic range of the sensor.

High dynamic range digital fluxgate magnetometer

A target's magnetic dipole includes both a permanent component and an induced component that is caused by the interaction of the target at a given heading with the ambient magnetic field. In order to accurately classify targets, a library of characterization matrices is built for a plurality of candidate targets. The matrices characterize what the magnetic dipoles would be in a given ambient magnetic field at a particular heading. In practice, some localization algorithm is used to provide a target's magnetic dipole and heading. Magnetic dipoles for each of the candidate targets are predicted using the target's heading, the ambient magnetic field, and the characterization matrices. The target is then classified as the candidate target(s) providing the best match to the target's measured magnetic dipole.

Magnetic dipole target classifier and method

Self leveling apparatus that includes a frame, a device that is to be leveled, and a leveling mechanism such as a double ring gimbal having an inner gimbal ring and an outer gimbal ring. The outer gimbal ring is secured to the frame and the inner gimbal ring is secured to the device and to the outer ring. The inner ring comprises a viscous or preloaded bearing that allows the device to swing around an inner ring axle to thereby level itself in that axis and prevent spurious movement of the device. The outer gimbal ring and inner gimbal ring are attached by outer axles that comprise a viscous or preloaded bearing that allow the inner gimbal ring to swing around the outer axles thereby level the inner gimbal ring in that axis and prevent spurious movement of the device. A disclosed embodiment of the invention includes a magnetometer sensor that is coupled to signal processing and telemetry electronics and a power source that are leveled to keep axes of the sensor oriented along horizontal and vertical axes.

Self leveling sensor/device package

Digital logic and a high resolution digital to analog converter are used to adequately digitize a magnetic signal that is subsequently processed by magnetic data processing algorithms. The high resolution digital to analog converter is directly incorporated in a feedback loop of a magnetometer sensor, an expensive precision analog to digital converter is replaced by a less expensive, lower power digital to analog converter. The circuit improvement provided by the present invention includes an analog low pass filter coupled to the sensor, a digital logic circuit coupled to the analog low pass filter for providing an output signal from the magnetometer and a feedback output signal, and the digital to analog converter coupled between the digital logic circuit and a feedback coil of the sensor for coupling the feedback output signal thereto. The digital logic circuit includes an analog to digital converter, an adder having a first input coupled to the analog to digital converter, and an accumulator coupled between an output of the adder and a second input of the adder. The digital logic circuitry processes the error signal from the analog multiplier, eliminates high frequency components, and digitizes the result. Thus, a low resolution analog to digital converter, having a resolution of only a few bits, may be used.

Digital flux gate magnetometer

Processing methods and apparatus that process magnetometer data derived from an array of magnetometer sensors and outputs both the position and velocity of a magnetic dipole. In the method and apparatus, (a) a set of actual magnetic field measurements of a magnetic dipole is collected using the array of magnetic sensors. Then (b), a trajectory for the magnetic dipole is hypothesized. Then (c), a set of estimated magnetic field measurements is determined that would be formed by a magnetic dipole moving along the hypothesized trajectory. Then (d), the actual magnetic field measurements are compared with the estimated magnetic field measurements. Then (e), based on the comparison, a new trajectory for the magnetic dipole is hypothesized. Steps (c) through (e) are repeated until agreement between the actual magnetic field measurements and the estimated magnetic field measurements is deemed sufficiently close. The trajectory is displayed for viewing on a display.

Localizing magnetic dipoles using spatial and temporal processing of

Digital logic comprising a high speed analog to digital converter, a high speed analog to digital converter, a digital multiplier, and an infinite impulse response filter and decimation circuit are used to digitize a magnetic signal that is subsequently processed by magnetic data processing algorithms. The high resolution digital to analog converter is directly incorporated in a feedback loop of a magnetometer sensor, and an expensive precision analog to digital converter is replaced by a less expensive, lower power digital to analog converter. The improvement provided by the present invention includes a high speed analog to digital converter coupled between the oscillator and a first input of a multiplier, and a second analog to digital converter that is coupled between the sense coil of the sensor and a second input of the multiplier. The output of the multiplier is coupled to an infinite impulse response filter and decimation circuit that produces the digital output signal from the magnetometer. The output of the infinite impulse response filter and decimation circuit is coupled by way of a digital to analog converter to the feedback coil of the sensor. Depending on the system requirements, the two analog to digital converters, the digital multiplier, and the infinite impulse response filter and decimation circuit may be implemented in one readily available microcontroller at low cost. This serves to reduce the number of components, complexity, and expense of the magnetometer.

Advanced digital flux gate magnetometer

A method of gate reduction in a gate width limited logic array. Common sub-groups of inputs associated with an array output are collected. Logical functions are then reimplemented, using the common subgroups implemented as single gates resulting in an implementation of the logical functions that uses few active devices. The method uses a constraint typically placed on gate array logic that gates wider than four inputs cannot be used. The method is applicable to combinatorial digital logic devices only. The method of the present invention is applicable to large scale integration (LSI) and very large scale integration (VLSI) integrated circuit devices.

Growing community of inventors

Fullerton, CA, United States of America

Kirk K Kohnen