公开(公告)号：US06353744B1

公开(公告)日：2002-03-05

申请号：US09374103

申请日：1999-08-16

申请人： Shiquan Wu ,  Song Zhang ,  Xixian Chen

发明人： Shiquan Wu ,  Song Zhang ,  Xixian Chen

IPC分类号： H04Q720

CPC分类号： H04W64/00 ,  G01S5/10

摘要： The invention is directed to positioning with low geometrical dilution of position (GDOP). Generally, the invention is a method for positioning including the steps of transmitting a asynchronous signal from a mobile to at least one base station; receiving the asynchronous signal at each base station; for each base station, determining a spherical line of position for the mobile using the received non-synchronous signal; and positioning the mobile using the spherical lines of position. The invention is a position location system which has the merits of both spherical and hyperbolic positioning systems while avoiding their drawbacks. The invention is less sensitive to GDOP and the mathematical model is easier to handle than the known hyperbolic system. The mathematical model embodied in the invention is equivalent to a convex quadratic probing subject to an ice-cream cone constraint. The invention also embodies an efficient algorithm for this optimization model. The invention is primarily directed to position location for E911, it can also applied to any other fields where position location is used, such as, but not limited to, radar positioning, satellite positioning and navigation systems.

摘要翻译： 本发明涉及用几何稀释几何位置（GDOP）进行定位。 通常，本发明是一种定位方法，包括以下步骤：从移动站向至少一个基站发送异步信号; 在每个基站接收异步信号; 对于每个基站，使用所接收的非同步信号确定移动站的球面行位线; 并使用球面线定位移动设备。 本发明是位置定位系统，其具有球面和双曲线定位系统的优点，同时避免了它们的缺点。 本发明对GDOP较不敏感，并且数学模型比已知的双曲线系统更容易处理。 本发明中体现的数学模型等同于经受冰淇淋锥限制的凸二次探测。 本发明还体现了该优化模型的有效算法。 本发明主要涉及用于E911的位置定位，它还可以应用于使用位置定位的任何其它领域，例如但不限于雷达定位，卫星定位和导航系统。

公开(公告)号：US06493380B1

公开(公告)日：2002-12-10

申请号：US09321819

申请日：1999-05-28

申请人： Shiquan Wu ,  Song Zhang ,  Xixian Chen

发明人： Shiquan Wu ,  Song Zhang ,  Xixian Chen

IPC分类号： H04B726

CPC分类号： G01S5/0215 ,  G01S5/02 ,  G01S5/06 ,  H04B7/005 ,  H04L25/0234

摘要： A method for estimating a time delay including the steps of first, estimating a channel spectrum from a received signal and a known reference signal, second, extracting a virtual array structure from the estimated channel spectrum, and third, determining the signal time delay using the virtual array structure. Further, a system for estimating a time delay including a channel spectrum estimator, means for extracting a virtual array structure and means for determining the time delay is provided. The channel spectrum estimator is used for estimating a channel spectrum from a received signal and a known reference signal. The means for extracting a virtual array structure uses the estimated channel spectrum. The means for determining the time delay uses the virtual array structure.

摘要翻译： 一种用于估计时间延迟的方法，包括首先从接收信号估计信道频谱和已知参考信号的步骤，其次，从所估计的信道频谱中提取虚拟阵列结构，以及第三，使用 虚拟阵列结构。 此外，提供了一种用于估计包括信道频谱估计器，用于提取虚拟阵列结构的装置和用于确定时间延迟的装置的时间延迟的系统。 信道频谱估计器用于从接收信号和已知参考信号估计信道频谱。 用于提取虚拟阵列结构的装置使用估计的信道频谱。 用于确定时间延迟的方法使用虚拟阵列结构。

公开(公告)号：US06549594B1

公开(公告)日：2003-04-15

申请号：US09329365

申请日：1999-06-10

申请人： Xixian Chen ,  Song Zhang ,  Shiquan Wu

发明人： Xixian Chen ,  Song Zhang ,  Shiquan Wu

IPC分类号： H04L700

CPC分类号： H04L25/0202

摘要： A method for timing phase recovery including the steps of first, estimating an open-eye sequence of a received signal, second, estimating a channel response using the open-eye sequence, and third, correlating the estimated channel response with an ideal channel response to determine the peak correlation location. The peak correlation location corresponds to the recovered timing phase. A system including means for estimating an open-eye sequence of a received signal, a channel estimator and a correlator is also provided. The channel estimator is used for estimating a channel response using the open-eye sequence and the received signal. The correlator is used for correlating the estimated channel response with an ideal channel response to determine the peak correlation location, the peak correlation location corresponding to the recovered timing phase.

摘要翻译： 一种用于定时相位恢复的方法，包括以下步骤：首先估计接收信号的睁眼序列，其次，使用睁眼序列估计信道响应，以及第三，将所估计的信道响应与理想信道响应相关联 确定峰值相关位置。 峰值相关位置对应于恢复的定时相位。 还提供了一种包括用于估计接收信号的睁眼序列的装置，信道估计器和相关器的系统。 信道估计器用于使用睁眼序列和接收信号来估计信道响应。 相关器用于将估计的信道响应与理想信道响应相关以确定峰值相关位置，对应于恢复的定时相位的峰值相关位置。

公开(公告)号：US06510186B1

公开(公告)日：2003-01-21

申请号：US09321818

申请日：1999-05-28

申请人： Xixian Chen ,  Song Zhang ,  Shiquan Wu

发明人： Xixian Chen ,  Song Zhang ,  Shiquan Wu

IPC分类号： H04L2706

CPC分类号： H04L25/0202

摘要： A time delay estimation method including the steps of first, estimating a channel response from a received signal, and second, determining a time delay estimate by correlating the estimated channel response with an ideal channel response. Further, a system including a channel estimator and a correlator is provided. The channel estimator is used for estimating a channel response from a received signal and the correlator is used for estimating a time delay using the channel response and an ideal channel response.

摘要翻译： 一种时间延迟估计方法，包括以下步骤：首先，从接收信号估计信道响应，其次，通过将所估计的信道响应与理想信道响应相关来确定时延估计。此外，包括信道估计器和 提供相关器。 信道估计器用于从接收信号估计信道响应，并且相关器用于使用信道响应和理想信道响应来估计时间延迟。

公开(公告)号：US06704300B1

公开(公告)日：2004-03-09

申请号：US09374000

申请日：1999-08-16

申请人： Xixian Chen ,  Song Zhang ,  Shiquan Wu

发明人： Xixian Chen ,  Song Zhang ,  Shiquan Wu

IPC分类号： H04J306

CPC分类号： H04J3/0697 ,  G01S5/12 ,  H04L7/042

摘要： The invention is directed to a method and system for acquisition of a time stamped signal burst while preserving timing information. A system for acquisition of a time stamped signal burst while preserving timing information. The system includes a first framer, an offset frequency compensator and a second framer. The first framer is for framing a buffered signal burst using least mean squares tuning to produce a first time stamp. The offset frequency compensator is for substantially removing a frequency offset from the first time stamp to produce a rough signal burst. The second framer is for framing the rough signal burst using least mean squares tuning to produce a fine signal burst arid a second time stamp, the second time stamp being more reliable than the first time stamp. A method system or acquisition of a time stamped signal burst while preserving timing information including the steps of framing using LMS and compensating for frequency offset. An advantage of the invention is increased reliability of the time stamp of the acquired signal burst.

摘要翻译： 本发明涉及一种用于在保留定时信息的同时采集时间戳信号脉冲串的方法和系统。 一种用于获取时间戳信号脉冲串同时保持定时信息的系统。 该系统包括第一成帧器，偏移频率补偿器和第二成帧器。 第一个成帧器用于使用最小均方调整来构建缓冲的信号突发以产生第一时间戳。 偏移频率补偿器用于基本上从第一时间戳移除频率偏移以产生粗略的信号脉冲串。 第二成帧器用于使用最小均方调整来构图粗略信号突发以产生精细信号脉冲串和第二时间戳，第二时间戳比第一时间戳更可靠。 一种方法系统或时间戳信号脉冲串的采集，同时保持定时信息，包括使用LMS进行成帧和补偿频率偏移的步骤。 本发明的一个优点是增加了获取的信号脉冲串的时间戳的可靠性。

公开(公告)号：US11187806B2

公开(公告)日：2021-11-30

申请号：US15657405

申请日：2017-07-24

申请人： Mohsen Rohani ,  Mohammad Mehdi Mansouri Rad ,  Song Zhang

发明人： Mohsen Rohani ,  Mohammad Mehdi Mansouri Rad ,  Song Zhang

IPC分类号： G01C3/08 ,  G01S17/89 ,  G01S7/481 ,  G01S17/42 ,  G01S17/931

摘要： A LIDAR scanning system. The LIDAR system comprises a laser configured to transmit laser light. An optical switch is optically coupled to the laser to receive laser light via an input port. The optical switch includes a plurality of output ports for transmitting received laser light to an environment to be scanned. Each of the plurality of output ports is oriented in a different direction. A detector subsystem is positioned to receive reflected laser light. A processor is coupled to the detector subsystem. The processor is configured to receive data signals from the detector subsystem. The processor is also configured to determine a distance from the LIDAR scanning system to one or more objects in an environment of the LIDAR scanning system based on a time between a transmission of beams of laser light and a reception of a reflection of the beams of laser light.

公开(公告)号：US20190339180A1

公开(公告)日：2019-11-07

申请号：US16401009

申请日：2019-05-01

申请人： Xiaodan Gu ,  Dakota F. Ehlenberg ,  Song Zhang

发明人： Xiaodan Gu ,  Dakota F. Ehlenberg ,  Song Zhang

IPC分类号： G01N3/08 ,  G01N3/02 ,  G01B13/24

摘要： The invention provides for a material characterization system, method, and instrumentation for measuring the mechanical properties of nano-scale thin films. The thin film mechanical characterization system, method, and instrumentation of the present invention for ultra-thin films includes a motor and load cell. The instrumentation device includes a bath that can be filled or used with liquid so that a thin film can float via the surface tension and can be stretched until permanent deformation occurs, while recording the amount of force applied by the motor and other parameters. Further, the invention provides a process that transfers the nano-scale thin film to the tensile testing instrument and a process to obtain the physical mechanical properties of thin films that are at the nanoscale level.

公开(公告)号：US20190025430A1

公开(公告)日：2019-01-24

申请号：US15657405

申请日：2017-07-24

申请人： Mohsen Rohani ,  Mohammad Mehdi Mansouri Rad ,  Song Zhang

发明人： Mohsen Rohani ,  Mohammad Mehdi Mansouri Rad ,  Song Zhang

IPC分类号： G01S17/89 ,  G01S7/481

摘要： A LIDAR scanning system. The LIDAR system comprises a laser configured to transmit laser light. An optical switch is optically coupled to the laser to receive laser light via an input port. The optical switch includes a plurality of output ports for transmitting received laser light to an environment to be scanned. Each of the plurality of output ports is oriented in a different direction. A detector subsystem is positioned to receive reflected laser light. A processor is coupled to the detector subsystem. The processor is configured to receive data signals from the detector subsystem. The processor is also configured to determine a distance from the LIDAR scanning system to one or more objects in an environment of the LIDAR scanning system based on a time between a transmission of beams of laser light and a reception of a reflection of the beams of laser light.

公开(公告)号：US20170299714A1

公开(公告)日：2017-10-19

申请号：US15262568

申请日：2016-09-12

申请人： Mohsen Rohani ,  Song Zhang

发明人： Mohsen Rohani ,  Song Zhang

IPC分类号： G01S13/90 ,  G01S7/04 ,  G01S13/93

CPC分类号： G01S13/90 ,  G01S7/024 ,  G01S7/043 ,  G01S7/415 ,  G01S13/426 ,  G01S13/52 ,  G01S13/89 ,  G01S13/931 ,  G01S2013/9385

摘要： A system and method to sense an environment based on data acquired by side looking radar. For example, a side looking radar is mounted on one or both sides of a ground-based vehicle and performs measurements from environment while the vehicle is moving. As the vehicle moves, a scan of the environment is therefore performed, wherein movement of the vehicle provides another dimension of information for the scan. In another example, the radar can further scan in the vertical plane at a fixed side looking angle to increase the field of view. A 3D map and localization can be determined from the scan.

公开(公告)号：US08861833B2

公开(公告)日：2014-10-14

申请号：US12388301

申请日：2009-02-18

申请人： Shing-Tung Yau ,  Song Zhang ,  Xiangfeng Gu

发明人： Shing-Tung Yau ,  Song Zhang ,  Xiangfeng Gu

IPC分类号： G06K9/00 ,  G06T7/00 ,  G06T1/00 ,  G01B11/25

CPC分类号： G01B11/2513 ,  G06T1/0007 ,  G06T7/521

摘要： A system for simultaneous real-time three-dimensional geometry and color texture acquisition. The system includes a system processor for generating at least three phase shifted black and white fringe patterns with a phase shift of 2 π/3, a light projector adapted to project the fringe patterns onto an object, the projector being electrically connected with the system processor, and a color camera for capturing the fringe patterns to generate at least three raw fringe images. The fringe images are used to calculate a black and white texture image which is further converted to a color image by employing a demosaicing algorithm. The fringe images are also used to calculate a wrapped phase map that is further processed to generate a continuous unwrapped phase map by employing a phase unwrapping algorithm and the unwrapped phase map is converted to co-ordinates using calibrated system parameters for point-by-point three-dimensional shape measurement.

摘要翻译： 一种用于同时实时三维几何和颜色纹理采集的系统。 该系统包括一个系统处理器，用于产生相移为2＆pgr / / 3的至少三个相移的黑白条纹图案，适用于将条纹图案投射到物体上的投影仪，投影仪与系统电连接 处理器和用于捕获条纹图案的彩色照相机以产生至少三个原始条纹图像。 边缘图像用于计算黑白纹理图像，其通过采用去马赛克算法进一步转换成彩色图像。 边缘图像还用于计算被包围的相位图，其被进一步处理以通过采用相位展开算法产生连续的展开相位图，并且使用校准的系统参数逐点地将展开的相位图转换为坐标 三维形状测量。