公开(公告)号：US20070092013A1

公开(公告)日：2007-04-26

申请号：US11470560

申请日：2006-09-06

申请人： Charles Cahn ,  Sharath Ananth

发明人： Charles Cahn ,  Sharath Ananth

IPC分类号： H04K1/10

CPC分类号： H04L27/2662 ,  H04L27/2676 ,  H04L27/2678 ,  H04L27/2688

摘要： Methods and Systems for tracking symbol timing of an OFDM signal are disclosed. In one embodiment, a wireless receiver includes signal tracking and timing logic to facilitate the timing of a demodulation operation such that the demodulation operation occurs on the proper symbol boundary, particularly when the OFDM signal has multipath components and the second component has greater power than the first.

摘要翻译： 公开了用于跟踪OFDM信号的符号定时的方法和系统。 在一个实施例中，无线接收机包括信号跟踪和定时逻辑，以促进解调操作的定时，使得解调操作发生在适当的符号边界上，特别是当OFDM信号具有多径分量并且第二分量的功率大于 第一。

公开(公告)号：US07190307B2

公开(公告)日：2007-03-13

申请号：US10759677

申请日：2004-01-18

申请人： Steven A. Gronemeyer

发明人： Steven A. Gronemeyer

IPC分类号： G01C21/34

CPC分类号： G01S19/235 ,  G01S19/30 ,  G01S19/34 ,  G01S19/42

摘要： A receiver in receipt of a plurality of pseudo noise codes, where each of the pseudo noise codes originates from a GPS transmitter and a plurality of chips make tip each pseudo noise code with an offset between 511 chips before a pseudo noise code boundary and 512 chips after the pseudo noise code boundary, and a local clock having an error of less than 0.5 ms relative to a GPS time and synchronized to a GPS signal that is able to be decoded with a decoder connected to the receiver and the local clock and by simultaneously solving the four pseudo range equations for at least four GPS transmitters a determination of the location of the receiver occurs.

摘要翻译： 接收多个伪噪声码的接收机，其中每个伪噪声码源自GPS发射机，并且多个码片在伪噪声码边界和512个码片之前使每个伪噪声码具有511码之间的偏移量， 在伪噪声码边界之后，以及相对于GPS时间具有小于0.5ms的误差的本地时钟，并与能够使用连接到接收机和本地时钟的解码器进行解码的GPS信号同步 对于至少四个GPS发射机求解四个伪距离方程，发生接收机位置的确定。

公开(公告)号：US07164736B2

公开(公告)日：2007-01-16

申请号：US09888227

申请日：2001-06-22

申请人： Anant Sahai ,  John Tsitsiklis

发明人： Anant Sahai ,  John Tsitsiklis

IPC分类号： H04L27/06

CPC分类号： G06F17/15 ,  G01S19/29

摘要： Techniques are provided for synthesizing a long coherent I and Q correlation integral at a particular frequency by synthetically combining a sequence of shorter correlation integrals at the same or different frequency. Techniques are also provided for acquiring a carrier-modulated signal with an unknown shift of the carrier frequency, and possibly some additional unknown signal parameters. These techniques involve synthesizing coherent correlation sums at a fine frequency resolution, using coherent correlation sums that are calculated at a coarse frequency resolution. This approach allows for coherent processing of the received signal over an arbitrarily long time interval, while avoiding the excessive computational requirements of traditional methods.

摘要翻译： 提供了通过在相同或不同频率下综合组合较短相关积分序列来合成特定频率的长相干I和Q相关积分的技术。 还提供了用于获取载波频率未知移位的载波调制信号以及可能的一些附加的未知信号参数的技术。 这些技术涉及使用以粗频率分辨率计算的相干相关和来以精细的频率分辨率合成相干相关和。 这种方法允许在任意长的时间间隔内对接收信号进行相干处理，同时避免传统方法的过度计算需求。

公开(公告)号：US07151485B2

公开(公告)日：2006-12-19

申请号：US10816054

申请日：2004-04-01

申请人： Anthony James Orler ,  Keith Jacob Brodie ,  Charles P. Norman

发明人： Anthony James Orler ,  Keith Jacob Brodie ,  Charles P. Norman

IPC分类号： H04B7/185

CPC分类号： G01S19/37 ,  G01S5/0009 ,  G01S19/14 ,  G01S19/35

摘要： Generic SATPS receivers and methods for configuring generic SATPS receivers that include a plurality of outputs are provided. These configurable SATPS receivers are adapted to be utilized in at least one of a plurality of particular SATPS receiver applications, and can also include a plurality of input paths, and a means for generating selected ones of the plurality of possible outputs. Selected ones of the plurality of outputs are enabled/disabled based on at least one requirement of the particular receiver application to configure or program the generic SATPS receiver to function as a SATPS receiver used for a particular SATPS receiver application or operating environment. The selected ones of the plurality of outputs can be defined by and can be those utilized by the particular SATPS receiver application or operating environment. Thus, SATPS receivers are provided that can be used in multiple applications, that can accept multiple types of assistance data, and that have multiple types of outputs depending on the application and/or desires of the user. The SATPS receiver can be implemented in SATPS systems that include at least one satellite that provides SATPS information, a generic SATPS receiver, and a remote computer.

公开(公告)号：US07145487B1

公开(公告)日：2006-12-05

申请号：US11064763

申请日：2005-02-23

申请人： Erik Anderson ,  Paul Eric Beckmann ,  William Kerry Keal

发明人： Erik Anderson ,  Paul Eric Beckmann ,  William Kerry Keal

IPC分类号： H03M7/00

CPC分类号： G01S19/24 ,  G01S19/37

摘要： Methods and devices for processing GPS signals are provided. The device includes: a memory for storing one or more lookup tables, each lookup table including a plurality of entries, each entry including an input segment and an output segment, wherein the output segment is a system response to the corresponding input segment. The device further includes a processor configured to receive an input data sequence including one or more input segments, and for each of the input segments, retrieve from one of the lookup tables the output segments corresponding to the input segment. The processor is further configured to perform a time-shifted sum of one or more output segments to produce an output sequence that is a downsampled representation of the input data sequence.

摘要翻译： 提供了处理GPS信号的方法和装置。 该设备包括：用于存储一个或多个查找表的存储器，每个查找表包括多个条目，每个条目包括输入段和输出段，其中输出段是对相应输入段的系统响应。 该设备还包括处理器，其被配置为接收包括一个或多个输入段的输入数据序列，并且对于每个输入段，从查找表中的一个检索与输入段对应的输出段。 处理器还被配置为执行一个或多个输出段的时移和，以产生作为输入数据序列的下采样表示的输出序列。

公开(公告)号：US07113552B1

公开(公告)日：2006-09-26

申请号：US10036788

申请日：2001-12-21

申请人： Charles P. Norman ,  Charles R. Cahn

发明人： Charles P. Norman ,  Charles R. Cahn

IPC分类号： H04L27/22

CPC分类号： H04L27/2338 ,  G01S19/21 ,  G01S19/24 ,  G01S19/29 ,  H03D7/16 ,  H04L27/2337

摘要： The present invention uses at least one amplitude bit to assist the phase-sampling technique used in digital receiver architectures. For digital receivers where the Intermediate Frequency (IF) is an integer multiple of the fundamental frequency fo, the present invention provides reduced processing complexity and reduced power consumption. The present invention allows the digital receiver to avoid performing coordinate rotation at high speeds, and replaces such a coordinate rotation with a simple phase subtraction. This replacement of the coordinate rotation allows the receiver to use a less complicated design, and to consume less power as a result.

摘要翻译： 本发明使用至少一个幅度比特来辅助数字接收机架构中使用的相位采样技术。 对于中频（IF）是基频f的整数倍的数字接收机，本发明提供了降低的处理复杂度和降低的功耗。 本发明允许数字接收机避免高速执行坐标旋转，并以简单的相位相减代替这种坐标旋转。 这种替换坐标旋转允许接收机使用较不复杂的设计，并因此消耗更少的功率。

公开(公告)号：US07035613B2

公开(公告)日：2006-04-25

申请号：US10715656

申请日：2003-11-18

申请人： Noshir B. Dubash ,  Robert Tso

发明人： Noshir B. Dubash ,  Robert Tso

IPC分类号： H04B1/10

CPC分类号： G01S19/32 ,  G01S19/34 ,  H04B1/005 ,  H04B1/28 ,  H04B1/406

摘要： In a system and method for simultaneously receiving or switching between dual frequency carrier signals in a GPS receiver, the GPS receiver is adapted to utilize different harmonics of a sub-harmonic frequency generator, which may include a lower frequency voltage controlled oscillator (VCO) to detect the L1 and L2 GPS carriers. A sub-harmonic mixer may be used to simultaneously down convert the L1 and L2 signals to a lower intermediate frequency (IF). A second mixer may be an image reject (IR) mixer used to separate the downconverted L1 and L2 signals. This mixer may be configured to simultaneously monitor the L1 and L2 signals, or to switch between the L1 and L2 signals. High frequency switching is not required of the radio frequency (RF) input or local oscillator signals, and simultaneous L1 and L2 reception is enabled without a 3 dB image noise degradation. This system and method minimizes the RF components and power dissipation in a dual frequency GPS receiver, while optimizing the functionality and performance.

摘要翻译： 在用于同时接收或切换GPS接收机中的双频载波信号的系统和方法中，GPS接收器适于利用次谐波频率发生器的不同谐波，其可以包括低频压控振荡器（VCO） 检测L1和L2 GPS载波。 可以使用副谐波混频器来同时将L1和L2信号下变频到较低的中频（IF）。 第二混频器可以是用于分离下变频的L1和L2信号的图像抑制（IR）混频器。 该混频器可以被配置为同时监视L1和L2信号，或者在L1和L2信号之间切换。 射频（RF）输入或本地振荡器信号不需要高频切换，并且在没有3dB图像噪声降级的情况下启用同时的L1和L2接收。 该系统和方法在优化功能和性能的同时，最大限度地减少双频GPS接收机中的射频组件和功耗。

公开(公告)号：US07026986B2

公开(公告)日：2006-04-11

申请号：US10775870

申请日：2004-02-10

申请人： Gregory Bret Turetzky ,  Charles P. Norman ,  Henry D. Falk

发明人： Gregory Bret Turetzky ,  Charles P. Norman ,  Henry D. Falk

IPC分类号： G01S5/02 ,  H04B7/185

CPC分类号： G01S19/37 ,  G01S5/0027 ,  G01S5/0036 ,  G01S19/09 ,  G01S19/21 ,  G01S19/25 ,  G01S19/26 ,  G01S19/30 ,  H04B1/7075 ,  H04B1/70755 ,  H04B1/708 ,  H04B1/7085 ,  H04B1/709 ,  H04B1/7097 ,  H04B2201/70715

摘要： The present invention discloses methods, apparatuses, and systems for eliminating auto- and cross-correlation in weak signal CDMA systems, such as GPS systems. The invention uses parallel dam paths that allow standard correlation of signals in parallel with verification of the lock signal to determine whether the system has locked onto the proper signal within the scanned signal window. The invention can be made with multiple CPUs, a single CPU with dual input modes, on multiple IC chips, or as a single IC chip solution for small, low cost reception, downconversion, correlation, and verification systems.

摘要翻译： 本发明公开了用于消除诸如GPS系统的弱信号CDMA系统中的自相关和互相关的方法，装置和系统。 本发明使用平行坝道，其允许信号与锁定信号的验证并行地进行标准相关，以确定系统是否锁定在扫描信号窗口内的适当信号上。 本发明可以由多个CPU，具有双输入模式的单个CPU，多个IC芯片，或作为用于小型，低成本接收，下变频，相关和验证系统的单个IC芯片解决方案制成。

公开(公告)号：US20060047459A1

公开(公告)日：2006-03-02

申请号：US11014684

申请日：2004-12-16

申请人： Paul Underbrink ,  Steven Gronemeyer

发明人： Paul Underbrink ,  Steven Gronemeyer

IPC分类号： G06F19/00

CPC分类号： G01S19/23

摘要： An Edge-Aligned Ratio Counter (EARC) that includes at least one processor coupled to at least one counter circuit is provided for determining a ratio between two clock signals by receiving a first and a second value in response to a first clock signal and generating a control signal under control of the loaded value by counting the pulses of the first clock signal and a second clock signal and captures the count of each clock signal in response to the control signal and determining a ratio between a frequency of the first clock signal and a frequency of the second clock signal using the differences of the captured counts taken at two different occurrences of the control signal.

摘要翻译： 提供了包括耦合到至少一个计数器电路的至少一个处理器的边缘对准比率计数器（EARC），用于通过响应于第一时钟信号接收第一和第二值来确定两个时钟信号之间的比率，并产生 通过对第一时钟信号的脉冲和第二时钟信号进行计数来控制负载值的控制信号，并且响应于控制信号捕获每个时钟信号的计数，并且确定第一时钟信号和第一时钟信号的频率之间的比率 使用在两个不同出现的控制信号时采集的捕获计数的差异来确定第二时钟信号的频率。

公开(公告)号：US07002514B2

公开(公告)日：2006-02-21

申请号：US10759921

申请日：2004-01-15

申请人： Julien Basch ,  Andrew Chou ,  Robert Lorenz ,  Jesse Stone

发明人： Julien Basch ,  Andrew Chou ,  Robert Lorenz ,  Jesse Stone

IPC分类号： H04B7/185

CPC分类号： G01S19/28 ,  G01S19/235

摘要： A systematic method for acquiring positioning signals, such as global positioning system (GPS) signals, uses different signal detection algorithms at different stages of signal detection. For example, a method for detecting multiple positioning signals may include first detecting a first positioning signal using a robust but less sensitive signal detection method, such as non-coherent integration. Based on the signal parameter values that allow detection of the first positional signal, detecting a second positioning signal using a more sensitive method, such as coherent integration. In this manner, by capturing the strongest signal first using a robust method, signal detection parameter values common to positioning signals can be narrowed to allow subsequent signal acquisitions using a more sensitive—but computationally more intensive—method.

摘要翻译： 用于获取定位信号的系统方法，如全球定位系统（GPS）信号，在信号检测的不同阶段使用不同的信号检测算法。 例如，用于检测多个定位信号的方法可以包括首先使用鲁棒但不太灵敏的信号检测方法来检测第一定位信号，例如非相干积分。 基于允许检测第一位置信号的信号参数值，使用诸如相干积分的更敏感的方法来检测第二定位信号。 以这种方式，通过使用鲁棒的方法首先捕获最强信号，可以缩小定位信号共同的信号检测参数值，以便使用更灵敏但计算更密集的方法来进行后续信号采集。