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1. 发明申请

US20100328145A1 Ephemeris Download From Weak Signals 有权
标题翻译：短信从弱信号下载
公开(公告)号：US20100328145A1
公开(公告)日：2010-12-30
申请号：US11612426
申请日：2006-12-18
申请人： Chi-Shin Wang , Yue-Meng Chen , Zhike Jia , EnYuan Tu
发明人： Chi-Shin Wang , Yue-Meng Chen , Zhike Jia , EnYuan Tu
IPC分类号： G01S19/41
CPC分类号： G01S19/13 , G01S19/24
摘要： The present invention provides systems and methods for downloading navigation data to a satellite receiver under weak signal conditions. In an embodiment, the receiver uses a tracking algorithm to estimate the Doppler frequency and rate of change of the Doppler frequency to compensate the phases of the I/Q samples from the received signal to reduce the effect of the Doppler frequency. In an embodiment, differential detection based data bit decoding is provided. In another embodiment, phase compensation based data bit decoding is provided, in which the phase of samples are rotated to compensate for phase error. In an embodiment, a multiple frame strategy is provided to increase signal-to-noise ratio (SNR) and improve sensitivity, in which similar placed samples in consecutive frames are coherently summed over the consecutive frames. In an embodiment, the samples are weighted to reduce the impact of noise in the multiple frame strategy.
摘要翻译：本发明提供了在弱信号条件下将导航数据下载到卫星接收机的系统和方法。在一个实施例中，接收机使用跟踪算法来估计多普勒频率的多普勒频率和变化率，以便从接收信号中补偿I / Q采样的相位，以减少多普勒频率的影响。在一个实施例中，提供了基于差分检测的数据比特解码。在另一个实施例中，提供了基于相位补偿的数据比特解码，其中样本的相位被旋转以补偿相位误差。在一个实施例中，提供多帧策略以增加信噪比（SNR）并提高灵敏度，其中连续帧中的类似放置样本在连续帧上相干相加。在一个实施例中，加权样本以减少多帧策略中噪声的影响。

2. 发明授权

US07847726B2 Navigational signal tracking in low power mode 有权
标题翻译：低功率模式下的导航信号跟踪
公开(公告)号：US07847726B2
公开(公告)日：2010-12-07
申请号：US11615431
申请日：2006-12-22
申请人： Zhike Jia , Shridhara A. Kurethaya , Chi-Shin Wang
发明人： Zhike Jia , Shridhara A. Kurethaya , Chi-Shin Wang
IPC分类号： G01S1/00
CPC分类号： G01S19/34 , G01S19/24
摘要： The present invention provides systems and methods for navigational signal tracking in low power mode to conserve the power of handheld navigation receivers. In an embodiment, the receiver cycles between sleep and wakeup states. During the sleep state, most of the components of the receiver are powered off to conserve power, and during the wakeup state, the receiver tracks navigational signals. In an embodiment, the duty cycle of the sleep/wakeup states depends on the receiver dynamic state, e.g., whether the receiver is accelerating. In another embodiment, during the wakeup state, the receiver selects a tracking mode based on the signal strength. Under weak signal conditions, a tracking mode using a long integration to track the satellite signal is disclosed. In one embodiment, a tracking mode tracks the navigation signal by performing data aided integration using known or predicted data bits, such as the TLM and HOW words.
摘要翻译：本发明提供了用于低功率模式的导航信号跟踪的系统和方法，以节省手持式导航接收机的功率。在一个实施例中，接收器在睡眠和唤醒状态之间循环。在睡眠状态期间，接收机的大多数组件被关闭以节省功率，并且在唤醒状态期间，接收器跟踪导航信号。在一个实施例中，睡眠/唤醒状态的占空比取决于接收机的动态状态，例如接收机是否正在加速。在另一个实施例中，在唤醒状态期间，接收机基于信号强度来选择跟踪模式。在弱信号条件下，公开了使用长积分跟踪卫星信号的跟踪模式。在一个实施例中，跟踪模式通过使用已知或预测的数据位（诸如TLM和HOW字）执行数据辅助积分来跟踪导航信号。

3. 发明授权

US07570208B2 Unassisted indoor GPS receiver 有权
标题翻译：无人值守的室内GPS接收器
公开(公告)号：US07570208B2
公开(公告)日：2009-08-04
申请号：US11324144
申请日：2005-12-29
申请人： Chi-Shin Wang , Zongde Qiu , Shridhara A. Kudrethaya , Jun Mo
发明人： Chi-Shin Wang , Zongde Qiu , Shridhara A. Kudrethaya , Jun Mo
IPC分类号： G01S5/14 , H04B1/16
CPC分类号： G01S19/24 , G01S19/246 , G01S19/27 , G01S19/29 , G01S19/34
摘要： The present invention provides GPS receivers capable of tracking very weak GPS signals particularly in an indoor environment without assistance from an external server or a network. In a preferred embodiment, a GPS receiver initially acquires and locks onto GPS satellite signals to compute receiver position outdoors. The GPS receiver then tracks at least one satellite signal indoors to maintain acquisition parameters for quick acquisition of GPS signals. To save power, the receiver automatically goes to the sleep state and periodically wakes up, i.e., powers up, to maintain the at least one satellite signal tracking. During the wakeup state, the receiver collects ephemeris data from the at least one satellite signal when the ephemeris data needs to be updated for quick acquisition of GPS signals.
摘要翻译：本发明提供了能够跟踪非常弱的GPS信号的GPS接收机，特别是在室内环境中，无需外部服务器或网络的协助。在一个优选实施例中，GPS接收机最初获取并锁定到GPS卫星信号上以在室外计算接收器位置。 GPS接收机然后在室内跟踪至少一个卫星信号，以维持采集参数，以便快速获取GPS信号。为了节省电力，接收机自动进入睡眠状态并周期性地唤醒，即上电，以维持至少一个卫星信号跟踪。在唤醒状态期间，当需要更新星历数据以快速获取GPS信号时，接收器从至少一个卫星信号收集星历数据。

4. 发明授权

US07456782B2 Timing calibration for fast signal reacquisition in navigational receivers 有权
标题翻译：导航接收机快速信号重新采集的定时校准
公开(公告)号：US07456782B2
公开(公告)日：2008-11-25
申请号：US11322654
申请日：2005-12-29
申请人： Chi-Shin Wang , Lianxue Xiong , Zhike Jia , Lei Dong , Jingbin Liu
发明人： Chi-Shin Wang , Lianxue Xiong , Zhike Jia , Lei Dong , Jingbin Liu
IPC分类号： G01S5/14
CPC分类号： G01S19/235 , G01S19/23 , G01S19/26 , G01S19/34
摘要： The present invention provides GPS receivers with clock calibration for fast reacquisition of GPS signals after waking up from a sleep state or coming out of signal blockage. In a preferred embodiment, a GPS receiver comprises a local clock based on an oscillator, e.g., crystal oscillator. The GPS receiver calculates a clock calibration value based on a computed oscillator count for the period during which the GPS receiver is in the sleep state or the signal is blocked. This clock calibration value is used to calibrate the local clock after the GPS receiver wakes up or comes out of signal blockage for fast reacquisition of GPS signals.
摘要翻译：本发明提供具有时钟校准的GPS接收机，用于在从休眠状态唤醒或从信号阻塞出来之后快速重新捕获GPS信号。在优选实施例中，GPS接收机包括基于例如晶体振荡器的振荡器的本地时钟。 GPS接收机基于GPS接收机处于睡眠状态或信号被阻塞的周期的计算振荡器计数来计算时钟校准值。该时钟校准值用于在GPS接收器唤醒或者信号阻塞之后校准本地时钟，以快速重新获取GPS信号。

5. 发明授权

US07428259B2 Efficient and flexible GPS receiver baseband architecture 有权
标题翻译：高效灵活的GPS接收机基带架构
公开(公告)号：US07428259B2
公开(公告)日：2008-09-23
申请号：US11123861
申请日：2005-05-06
申请人： Hansheng Wang , Chi-Shin Wang
发明人： Hansheng Wang , Chi-Shin Wang
IPC分类号： H04B1/00
CPC分类号： G01S19/37 , G01S19/235
摘要： The present invention provides a new baseband integrated circuit (IC) architecture for direct sequence spread spectrum (DSSS) communication receivers. The baseband IC has a single set of baseband correlators serving all channels in succession. No complex parallel channel hardware is required. A single on-chip code Numerically Controlled Oscillator (NCO) drives a pseudorandom number (PN) sequence generator, generates all code sampling frequencies, and is capable of self-correct through feedback from an off-chip processor. A carrier NCO generates corrected local frequencies. These on-chip NCOs generate all the necessary clocks. This architecture advantageously reduces the total hardware necessary for the receiver and the baseband IC thus can be realized with a minimal number of gate count. The invention can accommodate any number of channels in a navigational system such as the Global Positioning System (GPS), GLONASS, WAAS, LAAS, etc. The number of channels can be increased by increasing the circuit clock speed.
摘要翻译：本发明提供了一种用于直接序列扩频（DSSS）通信接收机的新的基带集成电路（IC）架构。基带IC具有一组基带相关器，连续地为所有通道服务。不需要复杂的并行通道硬件。单个片上代码数控振荡器（NCO）驱动伪随机数（PN）序列发生器，产生所有代码采样频率，并且能够通过来自片外处理器的反馈进行自校正。载波NCO产生校正的本地频率。这些片上NCO产生所有必需的时钟。该架构有利地减少了接收机和基带IC所需的总硬件，因此可以以最小数量的门数实现。本发明可以容纳诸如全球定位系统（GPS），GLONASS，WAAS，LAAS等导航系统中的任何数量的信道。可以通过增加电路时钟速度来增加信道数量。

6. 发明申请

US20080180321A1 METHODS AND SYSTEMS FOR ACQUISITION, REACQUISITION AND TRACKING OF WEAK NAVIGATIONAL SIGNALS 有权
标题翻译：弱导航信号的获取，反应和跟踪的方法和系统
公开(公告)号：US20080180321A1
公开(公告)日：2008-07-31
申请号：US11694786
申请日：2007-03-30
申请人： Chi-Shin Wang , Zhike Jia , Yue-Meng Chen , Jian Cheng , EnYuan Tu
发明人： Chi-Shin Wang , Zhike Jia , Yue-Meng Chen , Jian Cheng , EnYuan Tu
IPC分类号： G01S5/14 , G01S1/04
CPC分类号： H04B1/7075 , G01S19/235 , G01S19/29
摘要： Provided herein are systems and methods for achieving long coherent integration in a navigational receiver to improve the sensitivity of the receiver and enable the receiver to acquire, reacquire and track signals under very weak signal conditions. In an embodiment, phase compensation is computed based on estimated Doppler frequency, rate of change of the Doppler frequency with time, and second order rate of change of the Doppler frequency. The Doppler frequency may be computed from an orbital model or ephemeris. This phase compensation is used to compensate samples of the input signal for changes in the phase due to the Doppler frequency. Frequency components of the phase-compensated samples are then computed using a frequency analysis such as a Fast Fourier Transform (FFT). The maximum frequency component is taken as an error frequency and used to compensate the samples of the input signal for residual frequency error.
摘要翻译：本文提供了用于在导航接收机中实现长相干集成以提高接收机的灵敏度并使接收机能够在非常弱的信号条件下获取，重新获取和跟踪信号的系统和方法。在一个实施例中，基于估计的多普勒频率，多普勒频率随时间的变化率和多普勒频率的二阶变化率来计算相位补偿。多普勒频率可以从轨道模型或星历计算。该相位补偿用于补偿由于多普勒频率引起的相位变化的输入信号的样本。然后使用诸如快速傅立叶变换（FFT）的频率分析来计算相位补偿样本的频率分量。将最大频率分量作为误差频率，用于补偿输入信号的样本以获得残余频率误差。

7. 发明申请

US20080117100A1 NAVIGATION SIGNAL RECEIVER TRAJECTORY DETERMINATION 有权
标题翻译：导航信号接收机测距
公开(公告)号：US20080117100A1
公开(公告)日：2008-05-22
申请号：US11561758
申请日：2006-11-20
申请人： Chi-Shin Wang , David Wang , Wentao Zhang , Jun Mo , Lei Dong
发明人： Chi-Shin Wang , David Wang , Wentao Zhang , Jun Mo , Lei Dong
IPC分类号： G01S5/14
CPC分类号： G01S19/49 , G01S19/40
摘要： The present invention provides methods and systems that enable a mobile navigation receiver to accurately determine its trajectory with non-current ephemeris in stand-alone mode. In an embodiment, the receiver computes the position for the same location using non-current ephemeris and current ephemeris at different time instances. The receiver then determines a position correction by finding the difference between these two computed positions, and applies this correction to the trajectory generated with non-current ephemeris to obtain a more accurate trajectory. In another embodiment, the receiver computes an initial position of the receiver using non-current ephemeris and finds the difference between the computed initial position and an accurate approximation of the initial position. The receiver then shifts the subsequent receiver trajectory computed using non-current ephemeris by the difference to obtain a more accurate trajectory.
摘要翻译：本发明提供使移动导航接收机能够以独立模式的非当前星历精确地确定其轨迹的方法和系统。在一个实施例中，接收机使用不同时间的非当前星历和当前星历表计算相同位置的位置。然后，接收机通过找到这两个计算位置之间的差异来确定位置校正，并将该校正应用于由非当前星历产生的轨迹，以获得更准确的轨迹。在另一个实施例中，接收机使用非当前星历表计算接收机的初始位置，并且找出所计算的初始位置与初始位置的精确近似之间的差。然后，接收器将使用非当前星历计算的后续接收器轨迹移动该差，以获得更准确的轨迹。

8. 发明授权

US07324045B2 System and method for fast initialization of navigational satellite signal receivers 有权
标题翻译：导航卫星信号接收机快速初始化的系统和方法
公开(公告)号：US07324045B2
公开(公告)日：2008-01-29
申请号：US11124413
申请日：2005-05-06
申请人： Jun Mo , Hansheng Wang , Chi-Shin Wang , Shaowei Han , Kudrethaya A. Shridhara
发明人： Jun Mo , Hansheng Wang , Chi-Shin Wang , Shaowei Han , Kudrethaya A. Shridhara
IPC分类号： G01S1/00 , H04B7/185 , H04B1/00
CPC分类号： G01S19/28
摘要： The present invention provides a method and apparatus for a satellite navigation receiver to lock onto satellite signals in the cold start mode with no information on the receiver position, the satellite position, or time estimates stored in the receiver's memory. All satellites in a positioning system are divided into groups based on the satellite constellation structure. In an embodiment, the positioning system is the Global Positioning System (GPS) and all GPS satellites are divided into three groups. During initialization of the receiver, the satellites are searched per group to lock onto at least one satellite signal. Other satellites are then searched in a given order based on their respective distance or proximity to the first satellite acquired. This method reduces the Time-to-First-Fix (TTFF) ordinarily required by conventional receivers in the cold start mode.
摘要翻译：本发明提供了一种用于卫星导航接收机在冷启动模式下锁定卫星信号的方法和装置，其中没有关于存储在接收机的存储器中的接收机位置，卫星位置或时间估计的信息。基于卫星星座结构将定位系统中的所有卫星分成几组。在一个实施例中，定位系统是全球定位系统（GPS），所有GPS卫星分为三组。在接收机的初始化期间，每组搜索卫星以锁定至少一个卫星信号。然后根据其相应的距离或与所获取的第一卫星的距离，以给定的顺序搜索其他卫星。这种方法减少了常规接收机在冷启动模式下通常要求的首次固定时间（TTFF）。

9. 发明申请

US20070152878A1 Unassisted indoor GPS receiver 有权
标题翻译：无人值守的室内GPS接收器
公开(公告)号：US20070152878A1
公开(公告)日：2007-07-05
申请号：US11324144
申请日：2005-12-29
申请人： Chi-Shin Wang , Zongde Qiu , Shridhara Kudrethaya , Jun Mo
发明人： Chi-Shin Wang , Zongde Qiu , Shridhara Kudrethaya , Jun Mo
IPC分类号： G01S5/14
CPC分类号： G01S19/24 , G01S19/246 , G01S19/27 , G01S19/29 , G01S19/34
摘要： The present invention provides GPS receivers capable of tracking very weak GPS signals particularly in an indoor environment without assistance from an external server or a network. In a preferred embodiment, a GPS receiver initially acquires and locks onto GPS satellite signals to compute receiver position outdoors. The GPS receiver then tracks at least one satellite signal indoors to maintain acquisition parameters for quick acquisition of GPS signals. To save power, the receiver automatically goes to the sleep state and periodically wakes up, i.e., powers up, to maintain the at least one satellite signal tracking. During the wakeup state, the receiver collects ephemeris data from the at least one satellite signal when the ephemeris data needs to be updated for quick acquisition of GPS signals.
摘要翻译：本发明提供了能够跟踪非常弱的GPS信号的GPS接收机，特别是在室内环境中，无需外部服务器或网络的协助。在一个优选实施例中，GPS接收机最初获取并锁定到GPS卫星信号上以在室外计算接收器位置。 GPS接收机然后在室内跟踪至少一个卫星信号，以维持采集参数，以便快速获取GPS信号。为了节省电力，接收机自动进入睡眠状态并周期性地唤醒，即上电，以维持至少一个卫星信号跟踪。在唤醒状态期间，当需要更新星历数据以快速获取GPS信号时，接收器从至少一个卫星信号收集星历数据。

10. 发明授权

US06580455B1 High definition image sensor 失效
标题翻译：高分辨率图像传感器
公开(公告)号：US06580455B1
公开(公告)日：2003-06-17
申请号：US09073128
申请日：1998-05-05
申请人： Chi-Shin Wang , Zhimin Zhou , Li-Yen Shih
发明人： Chi-Shin Wang , Zhimin Zhou , Li-Yen Shih
IPC分类号： H04N314
CPC分类号： H04N5/363 , H04N5/365
摘要： An improved image sensing array including a semiconductive substrate having formed therein an array of discrete substrate areas organized in rows and columns. The array of areas is segmented into a plurality of blocks, each including a sub-array of the areas. At least one of the rows of each block has at least one reader cell formed therein, and the remaining rows of the block have photosensor cells formed in each area thereof. Each column of each block forms a column block including a plurality of photosensor cells, and a node line communicatively coupling each photosensor cell of the column block to an associated reader cell. A row address line is coupled to each photosensor cell in a particular row of the array. A column bit line is coupled to each reader cell in a particular column of the array. A block select line is coupled to each reader cell in a particular row of the array containing reader cells. In response to row select and block select inputs to the row address lines and the block select lines respectively, image data captured by each the photosensor cell is read out to a corresponding column-bit line through an associated reader cell for input to an output processing means. The output processing means may include a device for interpolating the data state of the image data supplanted by each reader cell of the array.
摘要翻译：一种改进的图像感测阵列，包括其中形成有以行和列组织的离散衬底区域的阵列的半导体衬底。区域阵列被分割成多个块，每个块包括区域的子阵列。每个块的行中的至少一行具有形成在其中的至少一个读取器单元，并且该块的其余行在其每个区域中形成有光电传感器单元。每个块的每列形成包括多个光电传感器单元的列块，以及将列块的每个光电传感器单元通信耦合到相关读取器单元的节点线。行地址线耦合到阵列的特定行中的每个光电传感器单元。列位线耦合到阵列的特定列中的每个读取器单元。块选择线耦合到包含读取器单元的阵列的特定行中的每个读取器单元。响应于对行地址线和块选择线的行选择和块选择输入，每个光电传感器单元捕获的图像数据通过相关联的读取器单元读出到对应的列位线，以输入到输出处理手段。输出处理装置可以包括用于内插由阵列的每个读取器单元取代的图像数据的数据状态的装置。

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