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    • 2. 发明授权
    • Noise floor independent delay-locked loop discriminator
    • 噪声独立的延迟锁定环路鉴频器
    • US07995683B2
    • 2011-08-09
    • US11923500
    • 2007-10-24
    • Xiang YuanGang Xie
    • Xiang YuanGang Xie
    • H03D1/00
    • G01S19/30G01S19/37H04B1/7075H04B1/7085H04B2201/70715
    • A system and method for providing code tracking in a CDMA based communications receiver. In example systems and methods, a CDMA receiver, such as a GPS receiver, receives a signal and demodulates the signal to yield a digital IF signal. The digital IF signal is down-converted to a received code signal. Early, prompt and late correlation results are determined by correlating the received code signal with early, prompt and late duplicates of the received code signal. The early, prompt and late correlation results are used to calculate a code phase error using a noise-floor independent function of all three correlation results.
    • 一种用于在基于CDMA的通信接收机中提供码跟踪的系统和方法。 在示例性系统和方法中,诸如GPS接收机的CDMA接收机接收信号并对信号进行解调以产生数字IF信号。 数字IF信号被下变频为接收的代码信号。 通过将接收到的代码信号与接收到的代码信号的早期,迅速和晚期重复相关来确定早期,及时和晚期的相关结果。 早期,及时和晚期相关结果用于使用所有三个相关结果的噪声层独立函数来计算码相位误差。
    • 5. 发明授权
    • System and method for estimating cell center position for cell ID based positioning
    • 用于基于小区ID的定位估计小区中心位置的系统和方法
    • US07974642B2
    • 2011-07-05
    • US11676927
    • 2007-02-20
    • Xiangdong LinMangesh ChambarkarMarlene WanLionel Garin
    • Xiangdong LinMangesh ChambarkarMarlene WanLionel Garin
    • H04Q5/00
    • H04W64/00G01S5/02G01S5/0242G01S5/0278G01S19/06
    • Systems and methods for estimating a cell center location in a wireless communication system having all interface to a satellite positioning system (“SPS”) such as for example, a Geosynchronous Positioning System (“GPS”). The wireless communication system provides service to mobile stations within a cell, each mobile station includes a SPS receiver. Examples of the systems and methods for estimating a cell center location analyze the mobile station locations in a cell as a uniform distribution of mobile station locations and calculate a statistical measure characterizing the mobile station locations as a function of the mobile station locations. In one example, the statistical measure is a maximum likelihood mobile station location. In another example, the statistical measure is the mean mobile station location in the cell. The estimated cell center location may be used to approximate the location of the mobile station during a warm or cold restart of the SPS receiver part of the mobile station.
    • 用于估计具有与诸如地球同步定位系统(“GPS”)的卫星定位系统(“SPS”)全部接口的无线通信系统中的小区中心位置的系统和方法。 无线通信系统向小区内的移动台提供服务,每个移动站包括SPS接收机。 用于估计小区中心位置的系统和方法的示例将小区中的移动站位置分析为移动站位置的均匀分布,并且计算表征作为移动站位置的函数的移动站位置的统计量度量。 在一个示例中,统计测量是最大似然移动站位置。 在另一示例中,统计测量是小区中的平均移动站位置。 估计的小区中心位置可以用于在移动台的SPS接收机部分的暖或冷重启期间近似移动台的位置。
    • 8. 发明申请
    • Systems and Methods for Minimizing Electromagnetic Interface
    • 最小化电磁接口的系统和方法
    • US20110034132A1
    • 2011-02-10
    • US12537295
    • 2009-08-07
    • Daniel Babitch
    • Daniel Babitch
    • H04B1/40
    • H04B15/02H03L7/16H04B2215/064H04B2215/065
    • Systems and methods for minimizing electromagnetic interference are provided. A representative electronic device includes a frequency generator that generates clock signals and a computing device that selects at least one generator frequency that minimizes or eliminates electromagnetic interference based on one or more radio bands of interest. The computing device is designed to send instructions associated with synthesizing the at least one generator frequency. The electronic device further includes a frequency synthesizer that receives the generated clock signals and instructions from the frequency generator and the computing device, respectively. The frequency synthesizer synthesizes the at least one generator frequency based on the received clock signal.
    • 提供了用于最小化电磁干扰的系统和方法。 代表性的电子设备包括产生时钟信号的频率发生器和选择至少一个发生器频率的计算设备,所述至少一个发生器频率使基于一个或多个感兴趣的无线电频段的电磁干扰最小化或消除。 计算设备被设计成发送与合成至少一个发生器频率相关联的指令。 电子装置还包括频率合成器,其分别从频率发生器和计算装置接收生成的时钟信号和指令。 频率合成器基于所接收的时钟信号来合成至少一个发生器频率。
    • 9. 发明授权
    • Systems and methods for mitigating multipath signals
    • 减轻多路径信号的系统和方法
    • US07881407B2
    • 2011-02-01
    • US12199066
    • 2008-08-27
    • Mangesh ChansarkarGang XieSanjai Kohli
    • Mangesh ChansarkarGang XieSanjai Kohli
    • H04L27/00H03D1/04G01S19/00
    • H04B7/216G01S19/22G01S19/40G01S19/42G01S19/49H04B1/707H04B1/7085H04B1/7115H04B2001/70706H04B2201/70715
    • Systems and methods for mitigating multipath signals in a receiver are provided. In this regard, a representative system, among others, includes a receiver comprising an antenna being configured to receive signals from a plurality of satellites, and a computing device being configured to: generate pseudorange measurements based on the received satellites signals, process the generated pseudorange measurements to reduce its pseudorange residuals based on statistical modeling in order to mitigate multipath errors, and compute navigation solutions based on the processed pseudorange measurements. A representative method, among others, for mitigating multipath signals in a receiver, comprises: receiving the pseudorange measurements; processing the received pseudorange measurements to reduce its pseudorange residuals based on statistical modeling in order to mitigate multipath errors; and computing navigation solutions based on the processed pseudorange measurements.
    • 提供了用于减轻接收机中的多径信号的系统和方法。 在这方面,代表性系统包括:接收机,其包括被配置为从多个卫星接收信号的天线,以及计算设备,被配置为:基于所接收的卫星信号产生伪距测量,处理所产生的伪距 基于统计建模来减少其伪距残差的测量,以减轻多路径误差,并根据处理的伪距测量计算导航解。 用于减轻接收机中的多路径信号的代表性方法包括:接收伪距测量; 处理所接收到的伪距测量以便基于统计建模来减少其伪距残差以便减轻多路径误差; 以及基于经处理的伪距测量的计算导航解决方案。
    • 10. 发明授权
    • Method and apparatus in positioning without broadcast ephemeris
    • 无广播星历的定位方法和设备
    • US07869948B2
    • 2011-01-11
    • US11741448
    • 2007-04-27
    • Shaowei Han
    • Shaowei Han
    • G01C21/20
    • G01S19/25G01S19/27
    • Provided herein are methods and system for enabling a navigation receiver to generate receiver specific satellite orbital models based on relatively small sets of parameters obtained from a server. In an embodiment, a set of parameters for a satellite includes a force parameter (e.g., solar radiation pressure), initial condition parameters (e.g., satellite position and velocity at a time instance) and time correction coefficients, which the receiver uses in a numerical integration to predict the position of the satellite. The set of parameters needed for the integration is small compared to current methods which require transmission of a complete set of ephemeris and other parameters for each satellite. Since the set of parameters is relatively small, it requires less communication resources to transmit compared to current methods. Further, the integration based on the small set of parameters enables the receiver to predict satellite orbits with low computational load.
    • 本文提供的方法和系统使得导航接收机能够基于从服务器获得的相对小的参数集合来生成接收机专用卫星轨道模型。 在一个实施例中,用于卫星的一组参数包括力参数(例如,太阳辐射压力),初始条件参数(例如,时间上的卫星位置和速度)和时间校正系数,接收器使用数字 整合以预测卫星的位置。 与需要传输一组完整的星历和每个卫星的其他参数的当前方法相比,集成所需的一组参数较小。 由于该组参数相对较小,因此与当前方法相比,传输资源要少。 此外,基于小的参数集合的集成使得接收机能够以低计算负荷来预测卫星轨道。