公开(公告)号：US20080084336A1

公开(公告)日：2008-04-10

申请号：US11548204

申请日：2006-10-10

Applicant: Chi-Shin Wang ,  Zongde Qiu ,  Zhike Jia

Inventor： Chi-Shin Wang ,  Zongde Qiu ,  Zhike Jia

IPC: H03M7/38

CPC classification number: G01S19/27 ,  G01S19/246 ,  G01S19/254

Abstract: The present invention provides systems and methods for enabling a navigation signal receiver to perform both data assisted and non-data assisted integration to provide better integration during signal acquisition, reacquisition and tracking. In data assisted integration mode, a receiver uses known or predicted data bits to remove the modulated data bits of a received signal prior to integration. In non data assisted integration mode, when the data bits are not known or predictable, the receiver uses an optimal estimation or maximum likelihood algorithm to determine the polarities of the modulated data bits of the received signal. This may be done by determining which of various possible bit pattern yields the maximum integrated power. When the modulated data bits are not known or predictable over a limited range, the receiver carries out data assisted integration over the known or predictable data bits and additional non data assisted integration.

Abstract translation: 本发明提供了使导航信号接收机能够执行数据辅助和非数据辅助集成的系统和方法，以在信号采集，重新采集和跟踪期间提供更好的集成。 在数据辅助积分模式中，接收机使用已知或预测的数据比特来在积分之前去除接收信号的调制数据比特。 在非数据辅助积分模式中，当数据比特未知或可预测时，接收机使用最优估计或最大似然算法来确定接收信号的调制数据比特的极性。 这可以通过确定各种可能的位模式中的哪一个产生最大集成功率来完成。 当调制数据位在有限范围内不知道或可预测时，接收机通过已知或可预测的数据位和附加的非数据辅助积分来执行数据辅助积分。

公开(公告)号：US20070152876A1

公开(公告)日：2007-07-05

申请号：US11322654

申请日：2005-12-29

Applicant: Chi-Shin Wang ,  Lianxue Xiong ,  Zhike Jia ,  Lei Dong ,  Jingbin Liu

Inventor： Chi-Shin Wang ,  Lianxue Xiong ,  Zhike Jia ,  Lei Dong ,  Jingbin Liu

IPC: G01S5/14

CPC classification number: G01S19/235 ,  G01S19/23 ,  G01S19/26 ,  G01S19/34

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20070109189A1

公开(公告)日：2007-05-17

申请号：US11274054

申请日：2005-11-14

Applicant: Zhike Jia ,  Shridhara Kudrethaya ,  Chi-Shin Wang

Inventor： Zhike Jia ,  Shridhara Kudrethaya ,  Chi-Shin Wang

IPC: G01S5/14

CPC classification number: G01S19/24

Abstract: The techniques to detect and mitigate the false reacquisition in a global satellite navigation receiver are disclosed. The false reacquisition due to frequency side-lobes and code autocorrelation secondary lobes are considered for mitigation. A set of two threshold values is used to detect correct reacquisition and reject false reacquisition. While the reacquisition of the signal is straight forward when the correlation is clear with the power above the first threshold, it is not so clear when the power is between two thresholds. So a further search for the maximum power among the retained dwells results in correct reacquisition. The search range depends upon the signal blockage interval and receiver dynamics. The feedback from navigational solution may be used to determine the search range both in frequency and code phase. In the case of frequency side-lobes, which occur only at specified frequency components, these frequencies are tested for maximum power response. The code side-lobes have similar characteristics and can be distinguished by the actual peak.

Abstract translation: 公开了一种用于检测和减轻全球卫星导航接收机中的虚假重新捕获的技术。 由于频率旁瓣和代码自相关副瓣引起的虚假反射被考虑用于缓解。 一组两个阈值用于检测正确的重新获取并拒绝错误的重新获取。 当信号的重新获取是直接的，当相关性清楚时，功率高于第一阈值，当功率在两个阈值之间时不是很清楚。 因此，进一步搜索保留住宅中的最大权力会导致正确的重新获取。 搜索范围取决于信号阻塞间隔和接收机动态。 导航解决方案的反馈可用于确定频率和码相位的搜索范围。 在仅在特定频率分量下发生的频率旁瓣的情况下，测试这些频率以获得最大功率响应。 代码旁瓣具有相似的特征，可以通过实际峰值来区分。

公开(公告)号：US20070013583A1

公开(公告)日：2007-01-18

申请号：US11179353

申请日：2005-07-12

Applicant: Chi-Shin Wang ,  Zhike Jia ,  Hansheng Wang

Inventor： Chi-Shin Wang ,  Zhike Jia ,  Hansheng Wang

IPC: G01S5/14

CPC classification number: G01S19/30

Abstract: A method and device to acquire navigational satellite signals combines non-coherent and coherent integrations and can efficiently acquire both strong and weak signals. Successive steps eliminate lower powered and less likely combinations of code offsets and carrier frequencies or dwells of a given satellite signal. Only remaining dwells then are correlated and integrated over larger time duration to obtain the most probable dwell or dwells, which results in reduced computational load. The selection of most likely dwells is based on Parseval's theorem on equivalence of power in time and frequency domains. An optimal estimator algorithm efficiently estimates the probable navigation data bits embedded in the received signal. In case of an ambiguity due to several possible dwells, the steps are repeated with a new set of signal samples.

Abstract translation: 一种获取导航卫星信号的方法和装置组合了非相干和相干的整合，可以有效地获得强信号和弱信号。 相继的步骤消除了给定卫星信号的代码偏移和载波频率或驻留的较低功率和不太可能的组合。 然后，只有剩余的住宅在较大的持续时间内相关并整合以获得最可能的停留或停留，这导致减少的计算负荷。 最可能的住宅选择是基于时间和频域功率等效的Parseval定理。 最优估计算法有效地估计嵌入在接收信号中的可能的导航数据位。 在由于几个可能的住宅而引起歧义的情况下，用新的一组信号样本重复这些步骤。

公开(公告)号：US20100328145A1

公开(公告)日：2010-12-30

申请号：US11612426

申请日：2006-12-18

Applicant: Chi-Shin Wang ,  Yue-Meng Chen ,  Zhike Jia ,  EnYuan Tu

Inventor： Chi-Shin Wang ,  Yue-Meng Chen ,  Zhike Jia ,  EnYuan Tu

IPC: G01S19/41

CPC classification number: G01S19/13 ,  G01S19/24

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US07847726B2

公开(公告)日：2010-12-07

申请号：US11615431

申请日：2006-12-22

Applicant: Zhike Jia ,  Shridhara A. Kurethaya ,  Chi-Shin Wang

Inventor： Zhike Jia ,  Shridhara A. Kurethaya ,  Chi-Shin Wang

IPC: G01S1/00

CPC classification number: G01S19/34 ,  G01S19/24

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US07570208B2

公开(公告)日：2009-08-04

申请号：US11324144

申请日：2005-12-29

Applicant: Chi-Shin Wang ,  Zongde Qiu ,  Shridhara A. Kudrethaya ,  Jun Mo

Inventor： Chi-Shin Wang ,  Zongde Qiu ,  Shridhara A. Kudrethaya ,  Jun Mo

IPC: G01S5/14 ,  H04B1/16

CPC classification number: G01S19/24 ,  G01S19/246 ,  G01S19/27 ,  G01S19/29 ,  G01S19/34

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US07456782B2

公开(公告)日：2008-11-25

申请号：US11322654

申请日：2005-12-29

Applicant: Chi-Shin Wang ,  Lianxue Xiong ,  Zhike Jia ,  Lei Dong ,  Jingbin Liu

Inventor： Chi-Shin Wang ,  Lianxue Xiong ,  Zhike Jia ,  Lei Dong ,  Jingbin Liu

IPC: G01S5/14

CPC classification number: G01S19/235 ,  G01S19/23 ,  G01S19/26 ,  G01S19/34

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US07428259B2

公开(公告)日：2008-09-23

申请号：US11123861

申请日：2005-05-06

Applicant: Hansheng Wang ,  Chi-Shin Wang

Inventor： Hansheng Wang ,  Chi-Shin Wang

IPC: H04B1/00

CPC classification number: G01S19/37 ,  G01S19/235

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20080180321A1

公开(公告)日：2008-07-31

申请号：US11694786

申请日：2007-03-30

Applicant: Chi-Shin Wang ,  Zhike Jia ,  Yue-Meng Chen ,  Jian Cheng ,  EnYuan Tu

Inventor： Chi-Shin Wang ,  Zhike Jia ,  Yue-Meng Chen ,  Jian Cheng ,  EnYuan Tu

IPC: G01S5/14 ,  G01S1/04

CPC classification number: H04B1/7075 ,  G01S19/235 ,  G01S19/29

Abstract: 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.

Abstract translation: 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。