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    Systems and methods for long range, high-capacity multipoint distance and velocity measurement
    1.
    发明授权
    Systems and methods for long range, high-capacity multipoint distance and velocity measurement 有权

    公开(公告)号：US11757487B2

    公开(公告)日：2023-09-12

    申请号：US17578162

    申请日：2022-01-18

    申请人： Lawrence J. Karr

    发明人： Lawrence J. Karr

    IPC分类号： H04B1/7075 ,  H04B1/7077

    CPC分类号： H04B1/70752 ,  H04B1/7077

    摘要： A round-trip, spread-spectrum navigation and locating system achieves high capacity and large processing gains in one-to-many and many-to-one configurations using round-trip signaling with frequency division based upon precise responding device carrier frequency offsets. Reduced cross-correlation is achieved by assigning these very small disparate frequency offsets to replies from interrogated devices so that the long-term correlation between disparate reply sequences is reduced almost to that of random noise of equivalent energy. The invention supports simultaneous interrogation of multiple responding devices, which responding devices respond essentially simultaneously at a fixed delay after receiving the query. The originating and/or responding devices may be fixed or mobile, permanently or temporarily deployed, terrestrial, airbourne or space-based with any source of power including batteries and solar without limitation. The signaling may be electromagnetic or acoustic with the potential for under-water use.

    APPARATUS AND METHOD FOR BURST SIGNAL DETECTION
    2.
    发明申请
    APPARATUS AND METHOD FOR BURST SIGNAL DETECTION 有权
    用于爆发信号检测的装置和方法

    公开(公告)号：US20160285659A1

    公开(公告)日：2016-09-29

    申请号：US15081505

    申请日：2016-03-25

    申请人： VT IDIRECT, INC.

    发明人： Ronggang QI ,  Sahana Raghunandan

    IPC分类号： H04L27/227

    CPC分类号： H04B1/10 ,  H04B1/70752 ,  H04B1/7077 ,  H04B1/709 ,  H04B7/2048 ,  H04B7/2125 ,  H04B7/2656 ,  H04L5/0053 ,  H04L7/0041 ,  H04L25/021 ,  H04L25/0228 ,  H04L27/0014 ,  H04L27/2278 ,  H04W56/0035

    摘要： An apparatus and method for detecting a burst signal. The apparatus includes circuitry that concatenates a predetermined number of samples and transmits the samples to a first programmable memory tap of a predetermined number of programmable memory taps. For each memory tap, a corresponding partial correlation is computed. A normalized sum of all the partial correlations is multiplexed and transmitted to a predetermined number of multipliers. A peak of the burst signal is determined by computing a summation of the complex multiplications of each multiplier, wherein the determined peak corresponds to a start of the burst signal.

    摘要翻译： 一种用于检测突发信号的装置和方法。 该装置包括连接预定数量样本并将样本发送到预定数量的可编程存储器抽头的第一可编程存储器抽头的电路。 对于每个存储器抽头，计算相应的部分相关。 所有部分相关的归一化和被复用并发送到预定数量的乘法器。 突发信号的峰值通过计算每个乘法器的复数乘法的总和来确定，其中所确定的峰值对应于突发信号的开始。

    APPARATUS AND METHOD FOR FREQUENCY ESTIMATION AMBIGUITY REMOVAL OF A BURST SIGNAL
    3.
    发明申请
    APPARATUS AND METHOD FOR FREQUENCY ESTIMATION AMBIGUITY REMOVAL OF A BURST SIGNAL 有权
    用于频率估计的装置和方法消除BURST信号的有效性

    公开(公告)号：US20160285651A1

    公开(公告)日：2016-09-29

    申请号：US15081532

    申请日：2016-03-25

    申请人： VT !DIRECT, INC.

    发明人： Ronggang QI ,  Baoyan DING

    IPC分类号： H04L25/02 ,  H04B1/10

    CPC分类号： H04B1/10 ,  H04B1/70752 ,  H04B1/7077 ,  H04B1/709 ,  H04B7/2048 ,  H04B7/2125 ,  H04B7/2656 ,  H04L5/0053 ,  H04L7/0041 ,  H04L25/021 ,  H04L25/0228 ,  H04L27/0014 ,  H04L27/2278 ,  H04W56/0035

    摘要： A device and method for estimating a bias in a frequency estimate of a received signal. Circuitry generates a first signal including a number of sample-blocks, wherein the first signal is shifted in frequency from the received signal by a first frequency shift. Based on the first signal, a second signal and a third signal are generated, by shifting a frequency of each of the samples of the first generated signal by a second frequency shift and a third frequency shift, respectively. For each generated signal, a variance for each sample-block is computed. An average variance of the computed sample-block variances is further calculated and a bias of the received signal is determined as one of the first frequency shift, the second frequency shift, and the third frequency shift, corresponding to the generated signal having the smallest calculated average variance.

    摘要翻译： 一种用于估计接收信号的频率估计中的偏差的装置和方法。 电路产生包括多个采样块的第一信号，其中第一信号以接收信号的频率偏移第一频移。 基于第一信号，通过分别将第一产生信号的每个采样的频率分别移位第二频移和第三频移，产生第二信号和第三信号。 对于每个生成的信号，计算每个采样块的方差。 进一步计算所计算的采样块方差的平均方差，并将接收信号的偏置确定为与所计算的最小的所计算的最小的所生成的信号相对应的第一频移，第二频移和第三频移中的一个 平均差异。

    Cell search system for mobile station in time division duplex system and method for the same
    6.
    再颁专利
    Cell search system for mobile station in time division duplex system and method for the same 有权

    公开(公告)号：USRE44284E1

    公开(公告)日：2013-06-11

    申请号：US12692373

    申请日：2010-01-22

    申请人： Yu-Ro Lee ,  Dong-Seung Kwon

    发明人： Yu-Ro Lee ,  Dong-Seung Kwon

    IPC分类号： H04J3/06

    CPC分类号： H04B1/7077 ,  H04B1/7083 ,  H04B2201/70702

    摘要： A cell search system for a mobile station in a time division duplex system includes: a primary synchronization code search module for searching primary synchronization codes and comparing frame values of the primary synchronization codes to determine a position of the maximum value; a correlation module for estimating a phase value and acquiring a first correlation value; a secondary synchronization code search module for generating determinative variables and storing them based on the position of the maximum value; a comparison and decision module for detecting a maximum value of the determinative variables, comparing it with the values stored in the secondary synchronization code search module to count matching values, and comparing the count value with a system value to decide whether slot synchronization and group acquisition is successful; and a base station determination module for determining a second correlation value between midamble codes and the received signals, and selecting a maximum value of it to determine a base station.

    System and method for fast code phase and carrier frequency acquisition in GPS receiver
    7.
    发明授权
    System and method for fast code phase and carrier frequency acquisition in GPS receiver 有权

    公开(公告)号：US08457177B2

    公开(公告)日：2013-06-04

    申请号：US12395243

    申请日：2009-02-27

    申请人： Mark C. Sullivan

    发明人： Mark C. Sullivan

    IPC分类号： H03D1/00 ,  H04B1/707

    CPC分类号： G01S19/29 ,  G01S19/235 ,  G01S19/258 ,  G01S19/30 ,  H04B1/7077 ,  H04B2201/70715

    摘要： A GPS receiver acquires carrier frequency and Gold code phase using short segments of a received GPS signal. In one embodiment, a 1-ms segment of the GPS signal is transformed to the frequency domain. This is multiplied by a frequency representation of the Gold code. The resulting product is converted to the time domain, and a peak is detected. The location of the peak corresponds to the code phase. If no peak is located, the carrier frequency is changed. Full- and half-bin steps in carrier frequency are considered. Processing gain is achieved by using longer segments of the input signal, for example 4 or 16 ms and integrating 1-ms segments. Considerations are provided for compensating for the effects of a transition, should it occur in the short segment of the GPS signal being processed. Integrations can be performed using non-coherent and coherent techniques. Adjustments are made for non-integral millisecond segment lengths.

    Multiple correlation processing in code space search
    8.
    发明授权
    Multiple correlation processing in code space search 有权
    代码空间搜索中的多重相关处理

    公开(公告)号：US08442095B2

    公开(公告)日：2013-05-14

    申请号：US12139458

    申请日：2008-06-14

    申请人： Rizwan Ahmed ,  Emilija M. Simic

    发明人： Rizwan Ahmed ,  Emilija M. Simic

    IPC分类号： H04B1/69

    CPC分类号： H04B1/7077 ,  G01S19/30 ,  H04B1/709 ,  H04B2201/70715

    摘要： Methods and apparatus for code phase processing in a wireless communication device are described herein. A wireless device performs code phase search on a pseudo random code spread signal received over a wireless channel. A correlator correlates the received signal to a plurality of code phases in each of a plurality of frequency hypothesis. A maximum peak and a second peak are determined from the correlation results. Cross correlation processing is performed on the maximum peak and the maximum peak is discarded in favor of the second peak for position processing based on the results of the cross correlation.

    摘要翻译： 本文描述了无线通信设备中用于码相位处理的方法和装置。 无线设备对通过无线信道接收的伪随机码扩展信号执行码相搜索。 相关器将接收的信号与多个频率假设中的每一个中的多个码相关联。 根据相关结果确定最大峰值和第二峰值。 基于互相关的结果，对最大峰进行互相关处理，并舍弃最大峰，有利于位置处理的第二峰。

    Use of orthogonal or near orthogonal codes in reverse link
    10.
    发明授权
    Use of orthogonal or near orthogonal codes in reverse link 有权
    在反向链路中使用正交或近似正交码

    公开(公告)号：US08259744B2

    公开(公告)日：2012-09-04

    申请号：US12433309

    申请日：2009-04-30

    申请人： James A. Proctor ,  Pertti O. Alapuranen

    发明人： James A. Proctor ,  Pertti O. Alapuranen

    IPC分类号： H04B7/216

    CPC分类号： H04J3/0635 ,  H04B1/707 ,  H04B1/7077 ,  H04J13/0022 ,  H04J13/18 ,  H04L7/043 ,  H04W72/0446

    摘要： An apparatus for use with a shared access communication channel is disclosed. The chipping rate of a first group of terminals is determined. Transmissions on the shared access communication channel are encoded using first pseudorandom noise (PN) code and a phase shift at the first chipping rate and an orthogonal spreading code having a chipping rate less than the first chipping rate. The apparatus may receive a feedback channel assignment and may receive an indication of a change in timing on the assigned feedback channel.

    摘要翻译： 公开了一种与共享接入通信信道一起使用的装置。 确定第一组终端的切片率。 使用第一伪随机噪声（PN）码和第一码片切换速率的相移以及具有小于第一码片率的码片率的正交扩展码对共享接入通信信道上的传输进行编码。 该装置可以接收反馈信道分配，并且可以在所分配的反馈信道上接收定时改变的指示。