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    • 3. 发明申请
    • Method and Apparatus for Determining a Position of a Vehicle
    • US20220024504A1
    • 2022-01-27
    • US17297001
    • 2019-11-28
    • Thales Holdings UK Plc
    • Andrew BATCHELORDouglas WATSON
    • B61L25/02G01C21/16
    • A computer-implemented method of determining a position of a vehicle within a transport network comprises obtaining track geometry data indicating track geometry of at least a part of the transport network; receiving first sensor data from an inertial measurement unit mounted to the vehicle; executing a Bayesian estimation filter algorithm to predict a position of the vehicle, wherein the Bayesian estimation filter algorithm comprises a process model, the process model comprising a strapdown inertial navigation algorithm, and wherein the strapdown inertial navigation algorithm generates data indicative of the predicted position of the vehicle based at least upon the first sensor data and the track geometry data such that the predicted position of the vehicle lies on a track defined by the track geometry data; receiving second sensor data from a sensor other than an inertial measurement unit, wherein the sensor is mounted to the vehicle; executing the Bayesian estimation filter algorithm to update the predicted position of the vehicle based at least upon the second sensor data; and generating an output indicative of a position of the vehicle within the transport network based upon at least one of the predicted position of the vehicle and the updated predicted position of the vehicle.
    • 7. 发明申请
    • MULTILOOK COHERENT CHANGE DETECTION
    • US20180059238A1
    • 2018-03-01
    • US15678898
    • 2017-08-16
    • Thales Holdings UK Plc
    • Malcolm StevensRichard Stroud
    • G01S13/90
    • G01S13/90
    • Methods and devices use information from the original SAR images to provide measurements that can be applied to corresponding change detection products. This produces reliable registration and alignment for the change products even when the imaging geometry is significantly changed. A method of processing synthetic aperture radar, SAR, image data comprising a plurality of frames of SAR image data for each of a plurality of image geometries; for each image geometry, applying change detection to the frames of SAR image data corresponding to that image geometry to produce a corresponding plurality of change products; selecting a plurality of said acquired frames as reference frames, one in respect of each image geometry; applying a multilook SAR process to the reference frames to produce a multilook SAR product, the multilook SAR process comprising at least one processing stage comprising measuring a property of the data contained in the reference frames and applying a transformation to the data governed by the measured property; and applying a multilook change process to the change products, the multilook change process comprising applying the same transformation as in the multilook SAR process, to the change products, to produce a multilook change product.
    • 9. 发明申请
    • LASER DIODE SIDE PUMPING OF AN ELONGATED SOLID-STATE LASER WITHOUT FOCUSING/OPTICS
    • 没有聚焦/光学的非线性固态激光器的激光二极管泵浦
    • US20150263479A1
    • 2015-09-17
    • US14431943
    • 2013-08-08
    • THALES HOLDINGS UK PLC
    • Trevor CookStephen LeeMark Silver
    • H01S3/0941H01S3/094H01S3/04H01S3/17H01S3/11H01S3/06H01S3/16
    • H01S3/0941H01S3/025H01S3/0405H01S3/0606H01S3/061H01S3/0617H01S3/0625H01S3/094084H01S3/11H01S3/113H01S3/1608H01S3/1618H01S3/17H01S5/4025
    • A side pumped laser comprises an elongated gain medium (10) provided between an output coupler (20) and a counter reflector (15) and a pump source (65) configured to provide radiation to the gain medium (10) along a side axis of the gain medium, wherein the laser is configured such that radiation from the pump source is directly incident on the gain medium; and the pump source is provided proximate, adjacent or in contact with the gain medium. The laser material and compositions, geometries and dimensions are designed to both maximise laser performance and to permit the use of construction techniques commonplace in the production of equipment designed for optical telecoms systems to facilitate low cost high volume and miniaturisation. The elongated gain medium (10) may have a polygonal cross-section with a non-coated side surface (55) receiving pump light emitted by a laser diode bar (65) while the other, non-emitting surfaces are coated with for example a gold coating (60) for pump light recycling and cooling of the gain medium by heat conduction. The counter reflector (15) may be provided on one facet of a passive Q-switch (30) and the output coupler (20) on a facet (50b) of the gain medium (10).
    • 侧泵浦激光器包括设置在输出耦合器(20)和反向反射器(15)之间的细长增益介质(10)和泵源(65),其被构造成沿着侧向轴线的侧轴向增益介质(10)提供辐射 所述增益介质,其中所述激光器被配置为使得来自所述泵浦源的辐射直接入射在所述增益介质上; 并且所述泵浦源被设置为接近,相邻或与所述增益介质接触。 激光材料和组合物,几何形状和尺寸被设计成最大限度地提高激光器性能,并允许在为光通信系统设计的设备的生产中常用的构造技术使用,以便于低成本大容量和小型化。 细长增益介质(10)可以具有多边形横截面,其中未涂覆的侧表面(55)接收由激光二极管棒(65)发射的泵浦光,而另一个非发射表面涂覆有例如 金涂层(60),用于泵光回收和通过热传导冷却增益介质。 反射器(15)可以设置在无源Q开关(30)的一个面上,输出耦合器(20)位于增益介质(10)的小平面(50b)上。