公开(公告)号：US5465413A

公开(公告)日：1995-11-07

申请号：US27004

申请日：1993-03-05

申请人： Per Enge ,  Dominic Farmer ,  Brian Westfall

发明人： Per Enge ,  Dominic Farmer ,  Brian Westfall

IPC分类号： H04B1/12

CPC分类号： H04B1/123

摘要： Method and apparatus for reducing or cancelling impulse noise from a signal containing noise. The desired noise-free signal is assumed to have a representative frequency .omega..sub.3, but may have a range of frequencies adjacent to this frequency, and is assumed to have substantially zero amplitude for all frequencies .omega. .omega..sub.2, where .omega..sub.1

公开(公告)号：US5630208A

公开(公告)日：1997-05-13

申请号：US277150

申请日：1994-07-19

申请人： Per Enge ,  Dominic Farmer ,  John F. Schipper

发明人： Per Enge ,  Dominic Farmer ,  John F. Schipper

IPC分类号： H04B7/005 ,  H04B1/10

CPC分类号： H04B1/711 ,  H04B7/005

摘要： Method and apparatus for using a plurality of correlators to improve an estimate of direct signal arrival time by identifying features of a correlation function at and adjacent to the correlation peak. In a first embodiment, the errors in location of the center point of a correlation function R(.tau.), formed by the incoming composite signal and a stored copy of the expected signal, are assumed to be strongly correlated for narrow sample spacing and wide sample spacing of the correlation function. In a second embodiment, multipath signal strengths and phases are estimated, using multiple sampling of the correlation function R(.tau.). This approach assumes that path delays of the direct signal and of the multipath signals can be determined separately. Path delays can be determined by any of at least three approaches: (1) identification of slope transition points in the correlation function; (2) Cepstrum processing of the received signal, using Fourier transform analysis; and (3) use of a grid of time points on the correlation function domain, and identification of time values, associated with certain solution parameters of the least mean squares analysis that have the largest absolute values, as times of arrival of the direct and multipath signals. Separate identification of multipath time delays reduces the least mean squares analysis to a linear problem. A modified signal is constructed, with the multipath signal(s) approximately removed from the incoming composite signal. This modified signal allows a better estimate of the arrival time of the direct signal.

摘要翻译： 用于使用多个相关器来通过识别和相邻相关峰值的相关函数的特征来改善直接信号到达时间的估计的方法和装置。 在第一实施例中，假定由输入复合信号形成的相关函数R（τ）的中心点的位置误差和预期信号的存储副本对于窄采样间隔和宽采样是强相关的 相关函数的间距。 在第二实施例中，使用相关函数R（τ）的多个采样来估计多径信号强度和相位。 该方法假设可以分别确定直接信号和多径信号的路径延迟。 路径延迟可以通过至少三种方法中的任何一种来确定：（1）识别相关函数中的斜率跃迁点; （2）倒频谱处理的接收信号，采用傅里叶变换分析; 和（3）在相关函数域上使用时间网格，以及与具有最大绝对值的最小均方分析的某些解的参数相关联的时间值的识别作为直接和多径的到达时间 信号。 多路径时间延迟的分离识别将线性问题的最小均方分析降低。 构造修改的信号，其中多路径信号从输入的复合信号中大致去除。 该修改的信号允许更好地估计直接信号的到达时间。

公开(公告)号：US6031882A

公开(公告)日：2000-02-29

申请号：US851873

申请日：1997-05-06

申请人： Per Enge ,  Dominic Farmer ,  John F. Schipper

发明人： Per Enge ,  Dominic Farmer ,  John F. Schipper

IPC分类号： H04B7/005 ,  H04L27/06

CPC分类号： H04B1/711 ,  H04B7/005

摘要： Method and apparatus for using a plurality of correlators to improve the estimate of direct signal arrival time by identifying detailed features of a correlation function at and adjacent to the correlation peak. The errors in location of the center point of a correlation function R(.tau.), formed by the received signal and a stored copy of the expected signal, are assumed to be strongly correlated for narrow sample spacing and wide sample spacing of the correlation function. Alternatively, the multipath signal strengths and phases are estimated by a least mean squares analysis, using multiple sampling of a correlation function of an expected signal and an arriving composite signal that includes the direct signal and one or more multipath signals. Times of arrival or path delays of the direct signal and the multipath signals are determined separately. Path delays can be determined by at least three approaches: (1) identification of slope transition points in the correlation function R(.tau.); (2) Cepstrum processing of the received signal, using Fourier transform and inverse transform analysis; and (3) use of a grid of time shift points for the correlation function, and identification of time shift values, associated with certain solution parameters for a least mean squares analysis that have the largest absolute values, as times of arrival of the direct and multipath signals. Separate identification of path delays reduces the least mean squares analysis to a solvable linear problem. A modified received signal is constructed, with multipath signal(s) approximately removed.

摘要翻译： 一种用于使用多个相关器来通过识别和相邻相关峰值的相关函数的详细特征来改善直接信号到达时间的估计的方法和装置。 假设由接收信号形成的相关函数R（τ）的中心点的位置误差和期望信号的存储副本对于相关函数的窄采样间隔和宽采样间隔而言是强相关的。 或者，使用预期信号的相关函数和包括直接信号和一个或多个多径信号的到达复合信号的多次采样，通过最小均方分析来估计多径信号强度和相位。 分别确定直达信号和多径信号的到达时间或路径延迟。 路径延迟可以通过至少三种方法来确定：（1）识别相关函数R（τ）中的斜率跃迁点; （2）使用傅里叶变换和逆变换分析对接收信号进行倒谱处理; 和（3）使用相关函数的时间移位点网格，以及与具有最大绝对值的最小均方分析的某些解决方案参数相关联的时移值的识别作为直接和 多径信号 路径延迟的单独识别将最小均方分析降低到可解的线性问题。 构造修改的接收信号，其中多径信号被近似去除。

公开(公告)号：US08315389B2

公开(公告)日：2012-11-20

申请号：US12657677

申请日：2010-01-25

申请人： Di Qiu ,  Sherman Lo ,  David S. De Lorenzo ,  Dan Boneh ,  Per Enge

发明人： Di Qiu ,  Sherman Lo ,  David S. De Lorenzo ,  Dan Boneh ,  Per Enge

IPC分类号： H04K1/00

CPC分类号： G01S5/0252 ,  G08B21/0213 ,  G08B21/0269 ,  G08B21/0283 ,  H04L63/107 ,  H04W4/02 ,  H04W12/08

摘要： In a geo-security system, a device receives RF signals from multiple distinct classes of RF communication systems and extracts location-dependent signal parameters. A current geotag is computed from the parameters by fuzzy extractors involving quantization of the parameters and Reed-Solomon decoding to provide a reproducible unique geotag. The current geotag is compared with a stored geotag, and a geo-secured function of the device is executed based on the result of the comparison. The use of multiple signal sources of different types, combined with special fuzzy extractors provides a robust geotag that allows both lower false rejection rate and lower false acceptance rate.

摘要翻译： 在地理安全系统中，设备从多个不同类别的RF通信系统接收RF信号，并提取位置相关的信号参数。 目前的地理标签是通过模糊提取器从参数中计算出来的，这些模糊提取器涉及量化参数和里德 - 所罗门解码，以提供可重现的唯一地理标记。 将当前的地理标签与存储的地理标签进行比较，并根据比较结果执行设备的地理安全功能。 使用不同类型的多个信号源，结合特殊的模糊提取器提供了一个强大的地理标记，允许较低的错误拒收率和较低的错误接受率。

公开(公告)号：US20100278335A1

公开(公告)日：2010-11-04

申请号：US12263866

申请日：2008-11-03

申请人： Per Enge ,  David De Lorenzo ,  Truc De Lorenzo

发明人： Per Enge ,  David De Lorenzo ,  Truc De Lorenzo

IPC分类号： H04L9/08

CPC分类号： H04W12/04 ,  G01S19/14 ,  H04L9/0872 ,  H04L2209/80 ,  H04L2463/081 ,  H04W12/0013 ,  H04W12/00503

摘要： Aspects are applicable to secure encryption such as in the generation of a cryptographic key from location information as may be useful in portable/wireless communication devices. As an example, one embodiment is implemented as a method of generating cryptographic keys from location information derived from a signal received from a publicly-used wireless communication system. The location information is protected from fraudulently generated signals using direction of arrival of the received signal. The method attempts to verify that the direction of arrival corresponds to an expected direction of arrival for a received signal of the primary signal type, and in response to the direction of arrival being verified for the direction of arrival, and then enables use of an encryption key that is generated from positional information derived from the received signal

摘要翻译： 方面适用于安全加密，例如从可能在便携式/无线通信设备中有用的位置信息产生加密密钥。 作为示例，一个实施例被实现为从从公共使用的无线通信系统接收的信号导出的位置信息生成加密密钥的方法。 使用所接收的信号的到达方向来保护位置信息不被欺诈地产生的信号。 该方法尝试验证到达方向对应于主信号类型的接收信号的预期到达方向，并且响应于到达方向被验证到达方向，然后使能加密 密钥，其是从从接收信号导出的位置信息产生的

公开(公告)号：US08391488B2

公开(公告)日：2013-03-05

申请号：US12354607

申请日：2009-01-15

申请人： Di Qiu ,  Sherman Lo ,  Per Enge ,  Logan Scott ,  Dan Boneh ,  Ron Karpf

发明人： Di Qiu ,  Sherman Lo ,  Per Enge ,  Logan Scott ,  Dan Boneh ,  Ron Karpf

IPC分类号： H04K1/00 ,  G01S13/00 ,  H04L9/32 ,  G06F7/04 ,  G06F17/30 ,  G08B13/00 ,  G01N23/00 ,  H04L12/28 ,  G01S1/00 ,  H04N7/167 ,  H04N7/16 ,  G06F11/30

CPC分类号： H04L9/083 ,  H04L9/0872 ,  H04L9/3242 ,  H04L2209/38 ,  H04L2209/601 ,  H04L2209/80

摘要： A data encryption and decryption system securely geoencrypts data using location-dependent navigation signals. To increase the entropy of the cryptographic key to guard against a brute-force attack, geoencryption is made to depend on largely time-independent characteristics of the navigation signals that are not easily spoofed, including the time difference of arrival, the envelope-to-cycle difference, the differential signal-to-noise, the signal envelope shape, and the directions of arrival of the navigation signal set.

摘要翻译： 数据加密和解密系统使用位置相关的导航信号安全地对数据进行加密。 为了增加加密密钥的熵以防止暴力攻击，地理加密取决于不容易被欺骗的导航信号的很大程度上与时间无关的特征，包括到达时间差， 周期差，差分信号对噪声，信号包络形状和导航信号组的到达方向。

公开(公告)号：US07868819B2

公开(公告)日：2011-01-11

申请号：US12205521

申请日：2008-09-05

申请人： David De Lorenzo ,  Per Enge

发明人： David De Lorenzo ,  Per Enge

IPC分类号： G01S1/00 ,  H04B7/185

CPC分类号： G01S19/21

摘要： Various systems, methods and devices are implemented for processing received signals. Consistent with one such embodiment, a method is implemented for use in a signal-communication receiver having a carrier-tracking loop and a processor for operating adaptive algorithms. The method involves interpreting a received signal using space time adaptive processing (STAP). A convergence speed of the adaptive algorithms is set based on a noise bandwidth of a phase-locked loop (PLL) in the carrier-tracking loop. A carrier-phase de-rotation constraint is implemented into weight parameters of the STAP to preserve spatial and temporal degrees of freedom in the STAP.

摘要翻译： 实现各种系统，方法和设备来处理接收到的信号。 与一个这样的实施例一致，实现了一种用于具有载波跟踪环路的信号通信接收机和用于操作自适应算法的处理器的方法。 该方法涉及使用空间时间自适应处理（STAP）来解释接收到的信号。 基于载波跟踪环路中的锁相环（PLL）的噪声带宽，设置自适应算法的收敛速度。 载波相位去旋转约束被实现为STAP的权重参数，以保持STAP中的空间和时间自由度。

公开(公告)号：US20110181470A1

公开(公告)日：2011-07-28

申请号：US12657677

申请日：2010-01-25

申请人： Di Qiu ,  Sherman Lo ,  David S. De Lorenzo ,  Dan Boneh ,  Per Enge

发明人： Di Qiu ,  Sherman Lo ,  David S. De Lorenzo ,  Dan Boneh ,  Per Enge

IPC分类号： G01S5/02

CPC分类号： G01S5/0252 ,  G08B21/0213 ,  G08B21/0269 ,  G08B21/0283 ,  H04L63/107 ,  H04W4/02 ,  H04W12/08

摘要： In a geo-security system, a device receives RF signals from multiple distinct classes of RF communication systems and extracts location-dependent signal parameters. A current geotag is computed from the parameters by fuzzy extractors involving quantization of the parameters and Reed-Solomon decoding to provide a reproducible unique geotag. The current geotag is compared with a stored geotag, and a geo-secured function of the device is executed based on the result of the comparison. The use of multiple signal sources of different types, combined with special fuzzy extractors provides a robust geotag that allows both lower false rejection rate and lower false acceptance rate.

摘要翻译： 在地理安全系统中，设备从多个不同类别的RF通信系统接收RF信号，并提取位置相关的信号参数。 目前的地理标签是通过模糊提取器从参数中计算出来的，这些模糊提取器涉及量化参数和里德 - 所罗门解码，以提供可重现的唯一地理标记。 将当前的地理标签与存储的地理标签进行比较，并根据比较结果执行设备的地理安全功能。 使用不同类型的多个信号源，结合特殊的模糊提取器提供了一个强大的地理标记，允许较低的错误拒收率和较低的错误接受率。

公开(公告)号：US20090066574A1

公开(公告)日：2009-03-12

申请号：US12205521

申请日：2008-09-05

申请人： David De Lorenzo ,  Per Enge

发明人： David De Lorenzo ,  Per Enge

IPC分类号： G01S1/00

CPC分类号： G01S19/21

摘要： Various systems, methods and devices are implemented for processing received signals. Consistent with one such embodiment, a method is implemented for use in a signal-communication receiver having a carrier-tracking loop and a processor for operating adaptive algorithms. The method involves interpreting a received signal using space time adaptive processing (STAP). A convergence speed of the adaptive algorithms is set based on a noise bandwidth of a phase-locked loop (PLL) in the carrier-tracking loop. A carrier-phase de-rotation constraint is implemented into weight parameters of the STAP to preserve spatial and temporal degrees of freedom in the STAP.

摘要翻译： 实现各种系统，方法和设备来处理接收到的信号。 与一个这样的实施例一致，实现了一种用于具有载波跟踪环路的信号通信接收机和用于操作自适应算法的处理器的方法。 该方法涉及使用空间时间自适应处理（STAP）来解释接收到的信号。 基于载波跟踪环路中的锁相环（PLL）的噪声带宽，设置自适应算法的收敛速度。 载波相位去旋转约束被实现为STAP的权重参数，以保持STAP中的空间和时间自由度。

公开(公告)号：US06868110B2

公开(公告)日：2005-03-15

申请号：US09728949

申请日：2000-12-01

申请人： Robert Eric Phelts ,  Per Enge

发明人： Robert Eric Phelts ,  Per Enge

IPC分类号： G01S1/00 ,  H04B1/707 ,  H04B1/7085 ,  H04B1/711 ,  H04B1/7115 ,  H04L7/10 ,  H04B1/713

CPC分类号： H04B1/7085 ,  G01S19/22 ,  G01S19/30 ,  H04B1/711 ,  H04B1/7115

摘要： A multipath mitigation method consists of locating a multipath-invariant (MPI) point of an ideal autocorrelation function and measuring the distance between the MPI point and DLL. The same MPI point is located in a received correlation function, and the distance between the point and the DLL, now affected by multipath, is measured. The difference between the ideal distance and the actual distance is the code tracking error resulting from multipath. The error is subtracted from the computed pseudorange or used to control the DLL. The method can be used to reduce the effects of all types of tracking error sources, such as signal transmission failure or code noise.

摘要翻译： 多路径缓解方法包括定位理想自相关函数的多径不变（MPI）点，并测量MPI点和DLL之间的距离。 相同的MPI点位于接收到的相关函数中，并且测量点和现在受多径影响的DLL之间的距离。 理想距离和实际距离之间的差异是由多径产生的代码跟踪误差。 从计算的伪距中减去误差或用于控制DLL。 该方法可用于减少所有类型的跟踪误差源的影响，如信号传输失败或代码噪声。