Patent application number | Description | Published |
20110295431 | TIME DOMAIN VIBRATION REDUCTION AND CONTROL - A vibration control system includes a mechanical system which generates vibration; a sensor configured to measure the vibration and generate a vibration signal thereof, and a processor configured: (a) receive a vibration signal from a sensor in a mechanical system; (b) model the vibration signal using a time-domain function; (c) adjust one of an amplitude coefficient and a phase coefficient of the modeled vibration signal; (d) output a control signal corresponding to the modeled vibration signal to the mechanical system so as to reduce the vibration; and (e) receive another vibration signal from the sensor. Steps (c)-(e) are repeated when the average value of the vibration signal is greater than a predetermined value. A method for vibration control is also disclosed. | 12-01-2011 |
20120292494 | METHOD AND SYSTEM FOR SPECTRAL CALIBRATION OF A REMOTE SENSING SENSOR AND A SYNTHETIC TARGET HAVING A TUNABLE SPECTRAL COMPOSITION - A method and a system for spectral calibration of a remote sensing sensor and a synthetic target having a tunable spectral composition are described. The system or synthetic target includes a plurality of reflective mirrors arranged to reflect radiation from a source of radiation onto a remotely located radiation sensor. A first mirror in the plurality of mirrors is configured to reflect a first portion of the radiation in a first wavelength toward the remotely located radiation sensor. A second mirror in the plurality of mirrors is configured to reflect a second portion of the radiation in a second wavelength different from the first wavelength toward the remotely located radiation sensor. The first portion of the radiation and the second portion of the radiation can be selected to calibrate the remotely located radiation sensor so as to provide a quantitative spectral relationship between the radiation detected at the remotely located sensor and the radiation reflected by the plurality of mirrors. | 11-22-2012 |
20130027553 | METHOD AND SYSTEM FOR VICARIOUS SPATIAL CHARACTERIZATION OF A REMOTE IMAGE SENSOR - A method and a system for vicarious characterization of a remote sensing sensor are described. The system includes a plurality of reflective mirrors configured and arranged to reflect radiation from a source of radiation onto a remotely located radiation sensor. The plurality of mirrors are spaced apart so as to obtain a plurality of distinct spot images on the remotely located radiation sensor. The system further includes a processor configured to analyze the plurality of spot images by fitting the images to obtain a point spread function of the remote sensing sensor. | 01-31-2013 |
20140055785 | POLARIMETRIC CALIBRATION OF A REMOTE SENSOR - Described are methods and systems for vicarious polarimetric calibration and performance validation of a remote sensor. The system includes a plurality of reflective mirrors configured and arranged to reflect radiation from a source of radiation onto the remote sensor with accurately known polarimetric properties. Each of the reflective mirrors are located so that the target images do not overlap. The remote sensor is configured to receive the radiation reflected from the plurality of reflective mirrors and store the received radiation as image data (e.g., the image of each mirror appears as a point target). The system includes a processor configured to process the received data to provide direct calibration and performance validation for each polarimetric or spectral channel of the remote sensor. In addition, the calibration method removes all atmospheric effects except for transmittance and provides reference targets that have high polarimetric contrast, full spectrum performance and easy to deploy. | 02-27-2014 |
Patent application number | Description | Published |
20120008133 | SYSTEM AND METHOD FOR HYPERSPECTRAL AND POLARIMETRIC IMAGING - Embodiments of a system and method for collecting hyperspectral and polarimetric data that are spatially and temporally coincident include a dispersive element configured to receive incident electromagnetic radiation. The dispersive element is configured to disperse a non-zero order of the electromagnetic radiation into its constituent spectra, which is directed to a first focal plane array, and may be read out as hyperspectral data. The dispersive element is also configured to reflect a zero order of the electromagnetic radiation, which is directed through a polarity discriminating element to a second focal plane array, which may be read out as polarimetric data. By synchronously reading out the first and second focal plane arrays, the hyperspectral and polarimetric data may be both spatially and temporally coincident. | 01-12-2012 |
20120026496 | BANDWIDTH TUNABLE SPECTROSCOPIC DEVICE - An electromagnetic radiation detection device is described which includes a tunable dispersive optical element configured to receive electromagnetic radiation and to change the dispersion of the received electromagnetic radiation; a sensor configured to detect the dispersed electromagnetic radiation changed by the dispersive optical element; and a controller configured to: (i) selectively tune the dispersive optical element so as to adjust the dispersion of the received electromagnetic radiation; and (ii) change one or more of operating parameters of the sensor in accordance with the adjusted dispersion. In some implementations, the radiation detection device may be configured as a spectrometer to measure one or more properties of electromagnetic radiation. A method for detecting electromagnetic radiation is also disclosed. | 02-02-2012 |
20120081705 | TWO MATERIAL ACHROMATIC PRISM - A spectrometer comprises a detector array and a prism. The prism comprises a first prism element comprising a substantially crystalline crown material, and a second prism element contacting the first prism element, the second prism element comprising a substantially crystalline flint material. The spectrometer further includes optics configured to direct light at least twice through the prism. The prism is configured to disperse light received from the optics at an incident angle therethrough into constituent spectra in visible and infrared wavelength bands that are dispersed from the prism at angles offset from the incident angle. The constituent spectra are directed onto the detector array with approximately equal dispersion across the visible and infrared wavelength bands. Among other things, desirable material selections for the first and second prism elements are also disclosed. | 04-05-2012 |
20120081706 | TWO MATERIAL ACHROMATIC PRISM - A spectrometer comprises a detector array and a prism. The prism comprises a first prism element comprising a substantially crystalline crown material, and a second prism element contacting the first prism element, the second prism element comprising a substantially crystalline flint material. The spectrometer further includes optics configured to direct light at least twice through the prism. The prism is configured to disperse light received from the optics at an incident angle therethrough into constituent spectra in visible and infrared wavelength bands that are dispersed from the prism at angles offset from the incident angle. The constituent spectra are directed onto the detector array with approximately equal dispersion across the visible and infrared wavelength bands. Among other things, desirable material selections for the first and second prism elements are also disclosed. | 04-05-2012 |
20120120382 | MULTI-DIRECTIONAL ACTIVE SENSOR - A multi-directional sensor system includes a light source configured to generate a beam of electromagnetic radiation; and a transmitter configured to transmit the beam of electromagnetic radiation to a target. The transmitter may include (i) a plurality of optical fibers, wherein one or more of the optical fibers are configured to receive the beam of electromagnetic radiation, and (ii) a surface on which one end of each of the plurality of optical fibers terminate in a different direction and/or orientation thereof to emit electromagnetic radiation. A detector is configured to detect electromagnetic radiation responsive to electromagnetic radiation transmitted to the target. A method of sensing is also disclosed. | 05-17-2012 |
20120148188 | ENERGY TARGET SYSTEM - A system for determining properties of a radiant energy beam. The system include a plurality of fiber optic cables each including a first end and a second end and a plurality of optical coupling nodes coupled to a target body, wherein each optical coupling node includes one or more terminations, wherein each termination is coupled to the first end of one of the plurality of fiber optical cables to receive radiant energy from an incident radiant energy beam to determine properties of the radiant energy beam. | 06-14-2012 |
20120302160 | EXTENSIBLE HIGH BANDWIDTH GLOBAL SPACE COMMUNICATION NETWORK - Various embodiments provide a satellite communication system including a first transceiver and a second transceiver geographically fixed on the earth, and a first satellite configured to communicate with the first transceiver through a first link. The system further includes a second satellite configured to communicate with the second transceiver through a second link and communicate with the first satellite through a laser communication crosslink. The first satellite and the second satellite are at a low earth orbit or medium earth orbit below the geostationary earth orbit of approximately 36000 km. | 11-29-2012 |
20130327942 | COMPACT SPECTROMETER FOR REMOTE HYDROCARBON DETECTION - A multi-band imaging spectrometer and method of remote hydrocarbon gas detection using the spectrometer. One example of the multi-band imaging spectrometer includes a front objective optical system, and an optical spectrometer sub-system including a diffraction grating, the optical spectrometer sub-system configured to receive and collimate an input beam from the objective optical system to provide a collimated beam at the diffraction grating, the diffraction grating configured to disperse the collimated beam into at least two spectral bands. The spectrometer also includes a single entrance slit positioned between the objective optical system and the optical spectrometer sub-system and configured to direct the input beam from the objective optical system to the optical spectrometer sub-system, and a single focal plane array optically coupled to the diffraction grating and configured to produce an image from the at least two spectral bands. | 12-12-2013 |
Patent application number | Description | Published |
20130143591 | Position Optimization - Described are computer-based methods and apparatuses, including computer program products, for position determination. In some examples, the method includes receiving, by a device, position information from at least one other device. The method further includes modifying, by the device, an initial position based on the position information from the at least one other device to form a refined position. The method further includes transmitting, by the device, the refined position to the at least one other device. The method further includes revising, by the device, the refined position based on refined position information received from the at least one other device to form a final position. | 06-06-2013 |
20130265200 | Position Determination Using Local Time Difference - Described are computer-based methods and apparatuses, including computer program products, for determining a position. In some examples, the method includes determining measured time receipt differences from associated local receipt times for each pair of plurality of signals; determining a range difference for each of the plurality of signals based on the measured time receipt differences for each of the pairs of the plurality of signals; determining hypothesized range differences based on a hypothesized user position; determining an estimation difference for each of the plurality of signals based on the range difference and the hypothesized range difference for each of the plurality of signals based on a figure of merit; minimizing the estimation difference for the figure of merit based on a plurality of hypothesized user positions and an optimization routine; and outputting a user position based on a hypothesized user position associated with the minimized figure of merit. | 10-10-2013 |
20140016941 | HIGH-BANDWIDTH OPTICAL COMMUNICATIONS RELAY ARCHITECTURE - A free space optical communication system ( | 01-16-2014 |
20140058695 | GEOMETRIC CALIBRATION OF A REMOTE SENSOR - Geometric calibration of an imaging system is performed by recording visible control points in a calibration image whose geometric properties are known and calibration coefficients can be derived utilizing an image processing system for transforming the recorded image into a geometric distortion-free image. Described are methods and systems for vicarious geometric calibration of a remote sensor that include a processor configured to receive image data collected at a remote sensor, the image data including a plurality of image elements each associated with a respective reflective mirror from a plurality of reflective mirrors located at respective know positions, determine, for each of the plurality of reflective mirrors, an image location in the image data and determine one or more figures of merit based on the image locations and the known positions for each of the plurality of reflective mirrors. | 02-27-2014 |
20140078492 | MULTI-BAND IMAGING SPECTROMETER - One embodiment disclosed is a spectrometry system for collecting spatially and temporally co-registered hyperspectral data covering multiple spectral bands. The spectrometry system includes a single entrance slit for receiving light and a plurality of disperser elements operating over a plurality of distinct spectral bands to disperse the received light into constituent spectral channels. The system also includes a plurality of collimating and imaging optic elements that receive and re-image the dispersed light. The system also includes at least two focal plane arrays affixed in a common plane and configured to receive the re-imaged dispersed light, each of the at least two focal plane arrays being dedicated to sensing a distinct spectral band of the dispersed light. | 03-20-2014 |
20150062580 | POLARIMETRIC CALIBRATION OF A REMOTE SENSOR - Described are methods and systems for vicarious polarimetric calibration and performance validation of a remote sensor. The system includes a plurality of reflective mirrors configured and arranged to reflect radiation from a source of radiation onto the remote sensor with accurately known polarimetric properties. Each of the reflective mirrors are located so that the target images do not overlap. The remote sensor is configured to receive the radiation reflected from the plurality of reflective mirrors and store the received radiation as image data (e.g., the image of each mirror appears as a point target). The system includes a processor configured to process the received data to provide direct calibration and performance validation for each polarimetric or spectral channel of the remote sensor. In addition, the calibration method removes all atmospheric effects except for transmittance and provides reference targets that have high polarimetric contrast, full spectrum performance and easy to deploy. | 03-05-2015 |
20150071645 | HIGH-BANDWIDTH OPTICAL COMMUNICATIONS RELAY ARCHITECTURE - A free space optical communication system ( | 03-12-2015 |