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公开(公告)号：US20190199945A1
公开(公告)日：2019-06-27
申请号：US15851223
申请日：2017-12-21
Inventor： James A. Stobie , Michael J. Choiniere , R. Daniel McGrath
Abstract: A seeker includes a detection array having at least 2500 sensing pixels arranged in rows by row request lines and in columns by column request lines. At least one pixel includes an electromagnetic radiation sensor to trigger the pixel in response to sensing a triggering quantity of electromagnetic radiation, a row request circuit to send a row request after the pixel triggers, and a column request circuit to send a column request after the pixel triggers. The seeker further includes a row receiver to receive the row requests, a column receiver to receive the column requests, and a sequencer to receive, for each triggering pixel, the row of the row request and the column of the column request, and to generate an event including the received row and column of the pixel. The seeker also includes a time stamper to generate a time stamp for the generated event.
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公开(公告)号：US20190155126A1
公开(公告)日：2019-05-23
申请号：US15816151
申请日：2017-11-17
Inventor： Leonard A. Pomeranz , Peter A. Budni
Abstract: Techniques are provided for a multiwavelength laser source and a method of driving the multiwavelength laser source. The multiwavelength laser source includes: a plurality of seed lasers to generate a corresponding plurality of seed beams having a corresponding plurality of distinct seed wavelengths; a laser combiner to receive and combine the seed beams into a single first beam; an optical amplifier to amplify the first beam; and a single fixed nonlinear converter to convert and output the amplified first beam as a multiwavelength second beam including the seed wavelengths and one or more new wavelengths distinct from and generated from the seed wavelengths. In some embodiments, the nonlinear converter is an optical parametric oscillator (OPO) or an optical parametric generator (OPG). In some other embodiments, the nonlinear converter is a sum frequency generator (SFG), a difference frequency generator (DFG), or an optical parametric amplifier (OPA).
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公开(公告)号：US10277320B1
公开(公告)日：2019-04-30
申请号：US15968083
申请日：2018-05-01
Inventor： David A Haessig, Jr. , Dennis P Bowler , Robert T Carlson
IPC: H04B10/118 , H04B10/50
Abstract: A disclosed apparatus and method verify whether a hot spot within a scene is a valid laser-com signal, and further identify laser-com signals of interest. An extended Kalman filter (EKF) is applied to a received signal or beacon to detect whether it is modulated according to a square wave or other expected amplitude modulation pattern. Embodiments further determine whether the modulation frequency matches a signal or beacon of interest. In embodiments, a plurality of indexed EKF's are “tuned” to different modulation frequencies, and are used to identify a beacon's modulation frequency index. Where each EKF is required to compute amplitude and phase partial derivatives of the observation vector, the amplitude partials can be calculated according to the expected modulation pattern, and the phase partials can be calculated using a truncated Fourier or step-wise approximation of the expected modulation pattern. Embodiments further assume a time-invariant covariance matrix.
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公开(公告)号：US10267900B2
公开(公告)日：2019-04-23
申请号：US15344849
申请日：2016-11-07
Inventor： Michael J. Choiniere
Abstract: A system and method for covert targeting and communication that uses Laser Range Finder (LRF) and Digital Light Processing (DLP) technology. By modulating the pulses of the laser in a LRF according to a predetermined library and by using a “divide-by-two” shutter pattern scheme applied to the DLP mirror's field of view, a covert communication and targeting system can be utilized in the field as part of a lightweight, low cost system.
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公开(公告)号：US20190094278A1
公开(公告)日：2019-03-28
申请号：US15717266
申请日：2017-09-27
Inventor： David A. Lang
IPC: G01R27/26
Abstract: A system and method for analyzing a device under test is provided. The system includes a signal source for generating an incident signal. The incident signal is routed to one or more inputs of the device under test. The system further includes signal separation and routing circuitry for measuring a portion of the incident signal to provide a reference signal and for separating the incident signal and a reflected signal at the one or more inputs of the device under test. The signal separation circuitry for separating the incident signal and the reflected signal at the input of the device under test is accomplished by a resistive device. The system may further include sampling device operationally coupled to the resistive device. The system and method may further include a signal switching mechanism for sequentially routing time slices of two or more signals to be coherently compared.
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Patent Agency Ranking
公开(公告)号：US10236980B1
公开(公告)日：2019-03-19
申请号：US16002052
申请日：2018-06-07
Inventor： Robert T Carlson , Dennis P Bowler , David C Donarski , David A Haessig, Jr. , Stuart M Lopata , Dale A Rickard
IPC: H04B10/112 , H04B10/118 , G06K9/62 , H04B10/079 , G06T7/13
Abstract: A disclosed apparatus and method detect light source “hotspots” and recognize laser communication signals within a scene, while minimizing repeat consideration of previously detected light sources. Local maxima are identified in pixel frames from a focal plane array (FPA), and compared with a table of previous detections. FPA frames can be used directly for hotspot detection, or successive FPA frames can be subtracted for edge detection. Most recent detection frame numbers, coordinates, signal values, and/or other information can be updated in the table upon repeat detection of a hotspot. Source identifying information can be included in the table for entries that are identified as laser communication signals. Source identifying features can be evaluated so that only signals of interest are saved in the table. Hotspots that remain undetected after a designated number of frames can be deleted from the table.
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公开(公告)号：US10234534B2
公开(公告)日：2019-03-19
申请号：US15273258
申请日：2016-09-22
Inventor： Allan M. Kabel
IPC: G01S5/02
Abstract: A method and system for Kalman-Filtering in geolocation is provided. One aspect of the disclosure provides using an extreme geo program/method to converge on the location of an emitter, using a correlation function inherent in a Correlation Interferometry Geolocation (CIGL) program, and using Kalman filtering to find a peak correlation surface for an array.
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公开(公告)号：US10234284B2
公开(公告)日：2019-03-19
申请号：US15154378
申请日：2016-05-13
Inventor： Michael J. Choiniere
Abstract: A multifunctional rangefinder capable of functioning as a rangefinder and at least one additional function. The multifunctional rangefinder comprises a laser transmitter for transmitting a laser pulse and an object lens, located at an inlet of the multifunctional rangefinder, for capturing light reflected by a target and focusing the reflected light at a first digital micro-mirror device. The first digital micro-mirror device has a plurality of micro-mirrors, and each of the plurality of micro-mirrors has an “on” position and an “off” position. A single detector element receives light reflected by the plurality of micro-mirrors of the first digital micro-mirror device. An optical condenser arrangement is located between the digital micro-mirror device and the detector element. An analog/digital converter is coupled to the single detector element for processing signals detected by the single detector element. A grating, a second digital micro-mirror device, first and second collimating lens are also provided.
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公开(公告)号：US10230467B1
公开(公告)日：2019-03-12
申请号：US16000991
申请日：2018-06-06
Inventor： David A Haessig, Jr. , Dennis P Bowler , Robert T Carlson
IPC: H04B10/118 , H04B10/67 , H04B10/112
Abstract: An apparatus and method for tracking a laser communication signal of interest incident on a focal plane array (FPA) identifies a plurality of “hotspots” in a scene of interest, and aligns a hotspot that is a signal of interest (SOI) or beacon component thereof with the FPA. Hotspot centroids can be estimated within a fraction of an FPA pixel by considering squares of four pixels and comparing their signal amplitudes. A multi-spot calculation is used to improve the position estimates of all of the hotspots by applying a Kalman filter to the hotspot position data and assuming that the relative hotspots positions are fixed. The calculation is periodically repeated to enable tracking of the SOI. Amplitude variability of the hotspots is accommodated by weighting the hotspot contributions according to their intensities. In embodiments, estimation error of the SOI centroid is less than a smallest dimension of the FPA pixels.
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公开(公告)号：US10225498B2
公开(公告)日：2019-03-05
申请号：US15596022
申请日：2017-05-16
Inventor： James A Stobie , R Daniel McGrath
Abstract: An image sensor suitable for low light level imaging, the image sensor having a plurality of pixels, each pixel having nMOS and pMOS components, provides a lower noise threshold as compared to prior art single-flavor pixels.
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