公开(公告)号：US20120062730A1

公开(公告)日：2012-03-15

申请号：US13320952

申请日：2010-05-03

Applicant: Gert Ferrano ,  Bernd Walser ,  Kristian Morin

Inventor： Gert Ferrano ,  Bernd Walser ,  Kristian Morin

IPC: H04N7/18 ,  H04N5/217

CPC classification number: H04N5/3692 ,  G01C11/02 ,  G03B9/00 ,  H04N7/18

Abstract: The invention relates to a method for correcting a distortion in an aerial photograph caused by a flight movement in the forward direction. The aerial photograph is captured by a surface sensor, the sensor lines of which sensor are exposed at different, successive exposure times, so that each individual sensor line senses a strip of terrain of the terrain flow over at the different exposure times. A relative flight altitude above the strips of terrain captured by the respective sensor line is assigned to the individual sensor lines. Furthermore, a compensation factor is separately determined for each of the individual sensor lines, wherein the factor depends on an air speed of the flying object, a focal length of the aerial camera and the relative flight altitude assigned to the respective sensor line, and corrects the distortion in the aerial photograph for the lines based on the respective compensation factor.

Abstract translation: 本发明涉及一种用于校正由向前方向的飞行运动引起的航空照片中的失真的方法。 航空照片由表面传感器捕获，传感器的传感器线以不同的连续曝光时间曝光，使得每个传感器线在不同的曝光时间内感测到地形的地形条。 高于相应传感器线捕获的地形条上的相对飞行高度被分配给各个传感器线。 此外，对于每个单独的传感器线分别确定补偿因子，其中该因素取决于飞行物体的空气速度，空中摄像机的焦距和分配给相应传感器线的相对飞行高度，并且校正 基于相应的补偿因子的线路的空中照片的失真。

公开(公告)号：US07250916B2

公开(公告)日：2007-07-31

申请号：US11184676

申请日：2005-07-19

Applicant: Waldemar Kunysz ,  Earl Badger ,  David Plamondon

Inventor： Waldemar Kunysz ,  Earl Badger ,  David Plamondon

IPC: H01Q13/10 ,  H01Q1/38 ,  H01Q1/36

CPC classification number: H01Q1/36 ,  H01Q9/27 ,  H01Q13/20

Abstract: An antenna is provided for acquiring RF signals from various satellite ranging systems including GPS, GLONASS, GALILEO and OmniSTAR®. The antenna configuration includes a radiating structure of multi-arm spiral slots terminated with fractal loops. A leaky wave microstrip spiral feed network is used to excite the radiating structure of the antenna. The fixed beam phased array of aperture coupled slots is optimized to receive a right hand polarized signal. The proposed antenna is made out of a single PCB board. The antenna has a very uniform phase and amplitude pattern in the azimuth plane from 1.15 to 1.65 GHz, therefore providing consistent performance at GPS, GLONASS, GALILEO and OmniSTAR® frequencies. The antenna also has a common phase center at the various frequencies from 1175 MHz to 1610 MHz and substantially the same radiation pattern and axial ratio characteristics.

Abstract translation: 提供了用于从包括GPS，GLONASS，GALILEO和OmniSTAR（R）的各种卫星测距系统获取RF信号的天线。 天线配置包括以分形回路端接的多臂螺旋槽的辐射结构。 使用漏波微带螺旋馈电网络来激发天线的辐射结构。 孔径耦合槽的固定光束相控阵列被优化以接收右手偏振信号。 所提出的天线由单个PCB板制成。 天线在1.15到1.65GHz的方位平面上具有非常均匀的相位和幅度图案，因此在GPS，GLONASS，GALILEO和OmniSTAR（R）频率下提供一致的性能。 该天线还具有从1175MHz到1610MHz的各种频率的公共相位中心以及基本相同的辐射方向图和轴向比特性。

公开(公告)号：US07193559B2

公开(公告)日：2007-03-20

申请号：US10758363

申请日：2004-01-15

Applicant: Thomas John Ford ,  Jason Hamilton ,  Michael Bobye

Inventor： Thomas John Ford ,  Jason Hamilton ,  Michael Bobye

IPC: G01S5/14

CPC classification number: G01C21/165 ,  G01S19/26 ,  G01S19/49

Abstract: An inertial (“INS”)/GPS receiver includes an INS sub-system which incorporates, into a modified Kalman filter, GPS observables and/or other observables that span previous and current times. The INS filter utilizes the observables to update position information relating to both the current and the previous times, and to propagate the current position, velocity and attitude related information. The GPS observable may be delta phase measurements, and the other observables may be, for example, wheel pick-offs (or counts of wheel revolutions) that are used to calculate along track differences, and so forth. The inclusion of the measurements in the filter together with the current and the previous position related information essentially eliminates the effect of system dynamics from the system model. A position difference can thus be formed that is directly observable by the phase difference or along track difference measured between the previous and current time epochs. Further, the delta phase measurements can be incorporated in the INS filter without having to maintain GPS carrier ambiguity states. The INS sub-system and the GPS sub-system share GPS and INS position and covariance information. The receiver time tags the INS and any other non-GPS measurement data with GPS time, and then uses the INS and GPS filters to produce INS and GPS position information that is synchronized in time. The GPS/INS receiver utilizes GPS position and associated covariance information and the GPS and/or other observables in the updating of the INS filter. The INS filter, in turn, provides updated system error information that is used to propagate inertial current position, velocity and attitude information. Further, the receiver utilizes the inertial position, velocity and covariance information in the GPS filters to speed up GPS satellite signal re-acquisition and associated ambiguity resolution operations

Abstract translation: 惯性（“INS”）/ GPS接收机包括INS子系统，其将改进的卡尔曼滤波器并入到可以观测的GPS观测器和/或其他可观测量，其可以跨越先前的和当前的时间。 INS过滤器利用可观测值来更新与当前和之前的时间有关的位置信息，并且传播当前位置，速度和态度相关信息。 GPS可观测可以是增量相位测量，而其它可观测量可以是例如用于沿着轨迹差异计算的轮子拾取（或车轮转数）），等等。 将测量结果与当前和先前的位置相关的信息一起纳入过滤器，基本上消除了系统模型的系统动力学的影响。 因此可以形成通过在先前和当前时间段之间测量的相位差或跟踪差可直接观察到的位置差异。 此外，Δ相位测量可以并入INS滤波器，而不必维护GPS载波模糊状态。 INS子系统和GPS子系统共享GPS和INS位置和协方差信息。 接收机时间使用GPS时间标记INS和任何其他非GPS测量数据，然后使用INS和GPS滤波器来产生时间同步的INS和GPS位置信息。 GPS / INS接收机在更新INS滤波器时使用GPS位置和相关协方差信息以及GPS和/或其他可观察值。 INS过滤器又提供用于传播惯性当前位置，速度和姿态信息的更新的系统错误信息。 此外，接收机利用GPS滤波器中的惯性位置，速度和协方差信息来加速GPS卫星信号重新获取和相关的模糊度解析操作

公开(公告)号：US5995044A

公开(公告)日：1999-11-30

申请号：US71311

申请日：1998-05-01

Applicant: Waldemar Kunysz ,  Thomas J. Ford ,  Janet Neumann

Inventor： Waldemar Kunysz ,  Thomas J. Ford ,  Janet Neumann

IPC: G01S1/00 ,  G01S19/46 ,  H04J11/00 ,  H01Q21/06 ,  H01Q21/24

CPC classification number: G01S19/22 ,  G01S19/36

Abstract: A GPS receiver embodying the invention includes a first channel that preferentially processes line-of-sight signals and a second channel that preferentially processes multipath signals. It then compares the results to determine if the multipath has degraded the results of the processing of the line-of-sight signals.

Abstract translation: 体现本发明的GPS接收机包括优先处理视线信号的第一信道和优先处理多径信号的第二信道。 然后，它比较结果以确定多路径是否已经降低了视距信号处理的结果。

公开(公告)号：US5809064A

公开(公告)日：1998-09-15

申请号：US691351

申请日：1996-08-02

Applicant: Patrick Fenton ,  Albert J. Van Dierendonck

Inventor： Patrick Fenton ,  Albert J. Van Dierendonck

IPC: G01S1/00 ,  H04B1/7085 ,  H04B1/709 ,  H04B1/69 ,  H04L27/30

CPC classification number: H04B1/7085 ,  G01S19/215 ,  G01S19/22 ,  G01S19/30 ,  G01S19/37 ,  G01S19/426 ,  H04B1/709 ,  G01S19/29

Abstract: A receiver for pseudorandom noise (PRN) encoded signals consisting of a sampling circuit, multiple carrier and code synchronizing circuits, and multiple digital autocorrelators. The sampling circuit provides digital samples of a received composite signal to each of the several receiver channel circuits. The synchronizing circuits are preferably non-coherent, in the sense that they track any phase shifts in the received signal and adjust the frequency and phase of a locally generated carrier reference signal accordingly, even in the presence of Doppler or ionospheric distortion. The autocorrelators in each channel form a delay lock loop (DLL) which correlates the digital samples of the composite signal with locally generated PRN code values to produce a plurality of (early, late), or (punctual, early-minus-late) correlation signals. The time delay spacing between the (early, late), and (punctual, early-minus-late) correlation signals are dynamically adjusted, such that in an initial acquisition mode, the delay spacing is relatively wide, on the order of approximately one PRN code chip time; once PRN code lock is achieved, the code delay spacing is narrowed to a fraction of a PRN code chip time.

公开(公告)号：US12000935B2

公开(公告)日：2024-06-04

申请号：US17543002

申请日：2021-12-06

Applicant: NovAtel Inc.

Inventor： David A. Brown ,  Patrick C. Fenton

IPC: G01S19/22 ,  G01S19/21 ,  G01S19/24 ,  G01S19/37

CPC classification number: G01S19/22 ,  G01S19/21 ,  G01S19/24 ,  G01S19/37

Abstract: An integrated GNSS signal having a plurality of signal components with arbitrary power allocation may be processed. In an embodiment, an integrated signal processing unit of a GNSS receiver may generate in parallel complex rotated samples for a sample of the integrated signal. The complex rotated samples (e.g., early and late complex rotated samples) may be accumulated in parallel in a window that spans any arbitrary width that is less than or equal to a number of code chips in a PRN code sequence. In an embodiment, the integrated signal processing unit may sequentially generate complex rotated samples for the sample. The complex rotated samples (e.g., early, punctual, and late complex rotated samples) may be sequentially accumulated in the window. The GNSS receiver may utilize the accumulated complex rotated samples to perform correlation techniques, perform multipath mitigation techniques, and/or track the integrated signal.

公开(公告)号：US11955713B2

公开(公告)日：2024-04-09

申请号：US17362116

申请日：2021-06-29

Applicant: NovAtel Inc.

Inventor： Alireza Gharaati Jahromi ,  Mohammad Saeid Ghaffarian Moslemi ,  Rashid Mirzavand Boroujeni

IPC: H01Q9/27 ,  H01Q1/08 ,  H01Q1/12 ,  H01Q1/24 ,  H01Q1/32 ,  H01Q1/36 ,  H01Q9/04 ,  H01Q13/10 ,  H01Q13/16 ,  H01Q15/04

CPC classification number: H01Q15/04 ,  H01Q1/085 ,  H01Q1/1271 ,  H01Q1/241 ,  H01Q1/32 ,  H01Q1/36 ,  H01Q9/0428 ,  H01Q9/27 ,  H01Q13/10 ,  H01Q13/16

Abstract: An antenna that provides a radiation pattern that is tilted relative to the perpendicular to the plane of the antenna is provided. The antenna may be located on an angled surface, but have its tilted beam reach maximum gain at its zenith. In alternative embodiments, the antenna may be substantially transparent or translucent allowing placement on a surface without blocking viewing through the surface.

公开(公告)号：US20230003899A1

公开(公告)日：2023-01-05

申请号：US17944385

申请日：2022-09-14

Applicant: NovAtel Inc.

Inventor： Ali Broumandan

IPC: G01S19/21 ,  G01S19/44 ,  G01S19/29 ,  G06F17/18

Abstract: A system and method for detecting spoofing of a Global Navigation Satellite System (GNSS) system using a plurality of antennas. Signals received by at least two of the plurality of antennas are authentication by use of one or more of a carrier phase authentication procedure, a signal power authentication procedure, and/or a channel distortion authentication procedure.

公开(公告)号：US20210334626A1

公开(公告)日：2021-10-28

申请号：US16860536

申请日：2020-04-28

Applicant: NovAtel Inc.

Inventor： Robert Hang ,  Joyce Chidinma Chidiadi

IPC: G06N3/04 ,  G06N3/063 ,  G01S19/37 ,  G01S19/21 ,  G06K9/46 ,  G06T7/00

Abstract: Systems and methods are described for classification of interference for GNSS receivers. One or more neural networks are utilized to classify RF signal data received by a GNSS receiver. The classification associates the RF signal data with an RF environment. Appropriate interference mitigation techniques can be implemented by the receiver based on the classification.

公开(公告)号：US20210263161A1

公开(公告)日：2021-08-26

申请号：US16799128

申请日：2020-02-24

Applicant: NovAtel Inc.

Inventor： Ali Broumandan

IPC: G01S19/22

Abstract: Structures and techniques are disclosed that can be used to reduce or remove code multipath error in GNSS receivers by implementing one or more monitoring correlators in a multipath-error estimation and correction (MEC) module. The MEC module detects and provides for correction of correlation peak distortion. In exemplary embodiments, a code tracking loop integrates all-chip-edges of a PRN, and a narrow-correlator is used to update the tracking loop rate while a multipath estimation module implements a blanked correlator to estimate and remove the multipath bias from the code tracking loop measurements.