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1. 发明授权

US06933886B1 Signal acquisition using data bit information 有权
标题翻译：使用数据位信息进行信号采集
公开(公告)号：US06933886B1
公开(公告)日：2005-08-23
申请号：US10316992
申请日：2002-12-11
申请人： Anant Sahai , Wallace Mann , Andrew Chou , Benjamin Van Roy
发明人： Anant Sahai , Wallace Mann , Andrew Chou , Benjamin Van Roy
IPC分类号： G01S1/00 , G01S5/00 , H04B7/185
CPC分类号： G01S19/30 , G01S19/06 , G01S19/09 , G01S19/24
摘要： Techniques are provided for aiding in acquiring a signal using the data bit information that is associated with each signal source. One aspect of the invention is to use the data bit information that is associated with each signal source when calculating the In Phase and Quadrature correlation integrals by using the sampled data associated with the received signal. By using the data bit information that is associated with each signal source, coherent correlation may be performed by breaking the signal into data blocks and performing calculations on a block-by-block basis. Coherent correlation is the calculation of In Phase and Quadrature correlation integrals for sampled data that is associated with the received signal.
摘要翻译：提供了使用与每个信号源相关联的数据位信息来帮助获取信号的技术。本发明的一个方面是通过使用与接收信号相关联的采样数据来计算In相位和正交相关积分时，使用与每个信号源相关联的数据比特信息。通过使用与每个信号源相关联的数据位信息，可以通过将信号分解成数据块并且在逐块的基础上执行计算来执行相干相关。相干相关是与接收信号相关联的采样数据的相位和正交相关积分的计算。

2. 发明授权

US06512479B1 Signal acquisition using data bit information 有权
标题翻译：使用数据位信息进行信号采集
公开(公告)号：US06512479B1
公开(公告)日：2003-01-28
申请号：US09888228
申请日：2001-06-22
申请人： Anant Sahai , Wallace Mann , Andrew Chou , Benjamin Van Roy
发明人： Anant Sahai , Wallace Mann , Andrew Chou , Benjamin Van Roy
IPC分类号： H04B7185
CPC分类号： G01S19/30 , G01S19/06 , G01S19/09 , G01S19/24
摘要： Techniques are provided for aiding in acquiring a signal using the data bit information that is associated with each signal source. One aspect of the invention is to use the data bit information that is associated with each signal source when calculating the In Phase and Quadrature correlation integrals by using the sampled data associated with the received signal. By using the data bit information that is associated with each signal source, coherent correlation may be performed by breaking the signal into data blocks and performing calculations on a block-by-block basis. Coherent correlation is the calculation of In Phase and Quadrature correlation integrals for sampled data that is associated with the received signal.
摘要翻译：提供了使用与每个信号源相关联的数据位信息来帮助获取信号的技术。本发明的一个方面是通过使用与接收信号相关联的采样数据来计算In相位和正交相关积分时，使用与每个信号源相关联的数据比特信息。通过使用与每个信号源相关联的数据位信息，可以通过将信号分解成数据块并且在逐块的基础上执行计算来执行相干相关。相干相关是与接收信号相关联的采样数据的相位和正交相关积分的计算。

3. 发明授权

US07069019B2 System and method to estimate the location of a receiver 失效
标题翻译：用于估计接收机位置的系统和方法
公开(公告)号：US07069019B2
公开(公告)日：2006-06-27
申请号：US10237557
申请日：2002-09-06
申请人： Anant Sahai , Andrew Chou
发明人： Anant Sahai , Andrew Chou
IPC分类号： H04Q7/20
CPC分类号： G01S19/29 , G01S19/09 , G01S19/22 , G01S19/30
摘要： System and method to determine the location of a receiver are provided. The received signal is decomposed into signal chunks that are then correlated with the reference signals of the transmitting sources. In some embodiments, the signal chunks may be shorter than the period of the reference signals. For each signal source, a grid of correlation values is constructed containing one column of correlation values for each signal chunk. Each column contains correlation values for several code-phases. Probes are executed in the grid to acquire the location-determining signals. In some embodiments, a probe includes calculating the fourier transform of a row in the grid, yielding correlation values associated with a refined set of frequency values. Potential acquisitions are verified by processing increasing portions of the received signal. Confirmed acquisition may be used to aid further acquisitions. Some embodiments eventually compress the received signal down to a one period duration by means of an ultra-stacking method. Additional verification, comprising multi-peak test and multi-path tests, may be performed on the correlation magnitude curve obtained from the ultra-stacked signal. Finally, refined code-phase values are extracted from these correlation magnitude curves.
摘要翻译：提供了确定接收机位置的系统和方法。接收到的信号被分解成信号块，然后与发射源的参考信号相关。在一些实施例中，信号块可以比参考信号的周期短。对于每个信号源，构造相关值网格，其包含每个信号块的一列相关值。每列包含几个代码阶段的相关值。探针在电网中执行以获取位置确定信号。在一些实施例中，探测器包括计算网格中的行的傅立叶变换，产生与精确的频率值集合相关联的相关值。通过处理增加的接收信号的部分来验证电位采集。确认收购可用于协助进一步收购。一些实施例最终通过超堆叠方法将接收到的信号压缩到一个周期。可以对从超层叠信号获得的相关幅度曲线进行包括多峰测试和多路径测试的附加验证。最后，从这些相关幅度曲线中提取出精细的码相位值。

4. 发明授权

US06542116B1 Determining the spatio-temporal and kinematic parameters of a signal receiver and its clock by information fusion 有权
标题翻译：通过信息融合确定信号接收机及其时钟的时空和运动学参数
公开(公告)号：US06542116B1
公开(公告)日：2003-04-01
申请号：US09888229
申请日：2001-06-22
申请人： Anant Sahai , Andrew Chou , Wallace Mann , Stefano Casadei
发明人： Anant Sahai , Andrew Chou , Wallace Mann , Stefano Casadei
IPC分类号： H04B7185
CPC分类号： G01S19/24 , G01S19/23
摘要： To determine the clock doppler of a signal receiver, sampled data received from a receiver into are divided into data segments of incremental length. The clock doppler is estimated based on correlating each data segment with the expected signal from each satellite, from a set of satellites, that is overhead the receiver. For each data segment, the correlated result of each satellite is used to refine subsequent calculations of the clock doppler of the next overhead satellite. When the clock doppler calculations for a data segment have been performed using all overhead satellites from the set of satellites, then the results for that data segment are used to refine the calculations for the next data segment. If a current bounds for the clock doppler value is within a pre-determined clock doppler bound-width value and a current bounds for a delay value is within a pre-determined delay bound-width value, then a magnitude template is determined using magnitude calculations of the I and Q correlation integrals obtained at various clock doppler values and various delay values.
摘要翻译：为了确定信号接收机的时钟多普勒，从接收机接收的采样数据被分成增量长度的数据段。基于将每个数据段与来自一组卫星的来自每个卫星的预期信号相关联的时钟多普勒估计，这是接收机的开销。对于每个数据段，每个卫星的相关结果用于细化下一个架空卫星的时钟多普勒的后续计算。当数据段的时钟多普勒计算已经使用卫星组中的所有开销卫星执行时，该数据段的结果被用于改进下一个数据段的计算。如果时钟多普勒值的电流限制在预定时钟多普勒边界宽度值内，并且延迟值的电流边界在预定的延迟边界宽度值内，则使用幅度计算确定幅度模板在各种时钟多普勒值和各种延迟值中获得的I和Q相关积分。

5. 发明授权

US06535163B1 Determining location information using sampled data containing location-determining signals and noise 有权
标题翻译：使用包含位置确定信号和噪声的采样数据确定位置信息
公开(公告)号：US06535163B1
公开(公告)日：2003-03-18
申请号：US09888337
申请日：2001-06-22
申请人： Anant Sahai , John Tsitsiklis , Benjamin Van Roy , Andrew Chou , Wallace Mann , Jesse Robert Stone , Wungkum Fong
发明人： Anant Sahai , John Tsitsiklis , Benjamin Van Roy , Andrew Chou , Wallace Mann , Jesse Robert Stone , Wungkum Fong
IPC分类号： H04B7185
CPC分类号： G01S19/30
摘要： To determine the location of a signal receiver, sampled data received from a receiver is divided into data segments of increasing length. Current ranges for a delay value and for a modulation frequency value are calculated relative to each satellite signal source that is overhead the signal receiver. Using the data segments of increasing length, the current ranges, estimates for the delay value and for the modulation frequency value are then iteratively calculated and updated. For each signal source, I and Q correlation integrals and their magnitude values are calculated using the modulation frequency value estimate and each of a range of delay values centered around the delay value estimate. The resulting magnitude-curve is interpolated using the calculated magnitude values. The location of the receiver is calculated using the shape of the magnitude-curve to represent the I and Q correlation integrals for each signal source.
摘要翻译：为了确定信号接收机的位置，从接收机接收的采样数据被分成长度增加的数据段。相对于信号接收器开销的每个卫星信号源计算延迟值和调制频率值的电流范围。使用长度增加的数据段，然后迭代地计算和更新电流范围，延迟值和调制频率值的估计。对于每个信号源，使用调制频率值估计和以延迟值估计为中心的每个延迟值范围来计算I和Q相关积分及其幅度值。所得到的幅度曲线使用所计算的幅度值进行内插。使用幅度曲线的形状来计算接收机的位置，以表示每个信号源的I和Q相关积分。

6. 发明授权

US07027534B2 Extracting fine-tuned estimates from correlation functions evaluated at a limited number of values 失效
公开(公告)号：US07027534B2
公开(公告)日：2006-04-11
申请号：US09888338
申请日：2001-06-22
申请人： Anant Sahai , John Tsitsiklis , Stefano Casadei , Andrew Chou , Benjamin Van Roy , Jesse Robert Stone
发明人： Anant Sahai , John Tsitsiklis , Stefano Casadei , Andrew Chou , Benjamin Van Roy , Jesse Robert Stone
IPC分类号： H03D1/00 , H04L27/06
CPC分类号： G01S19/09 , G01S19/29 , G01S19/30
摘要： Techniques are provided for fine-tuning estimates of a delay value for a sampled signal. One aspect of the invention is to perform, for the sampled signal, coarse-grained calculations of the In Phase and Quadrature (I and Q) correlation integrals at a limited number of points, wherein the calculations are performed over a range of hypothesized delay values. A range of delay values of interest are then determined from the coarse-grained calculations of the I and Q correlation integrals. A subset of I and Q values based on the coarse granularity calculations of the I and Q correlation functions is used to perform a time-domain interpolation to obtain fine-grained values of the I and Q integrals in the range of the delay values of interest. Magnitude calculations are performed based on the fine-grained values of the I and Q integrals. Fine-tuned estimates of delay value are based on the magnitude calculations. Alternatively, fine-tuned estimates of delay value are based on the template-matching approach.

7. 发明授权

US07164736B2 Synthesizing coherent correlation sums at one or multiple carrier frequencies using correlation sums calculated at a course set of frequencies 有权
标题翻译：使用在一组频率下计算的相关和来合成一个或多个载波频率的相干相关和
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。

8. 发明申请

US20070105502A1 NARROWBAND NOISE MITIGATION IN LOCATION-DETERMINING SIGNAL PROCESSING 审中-公开
标题翻译：位置确定信号处理中的窄带噪声抑制
公开(公告)号：US20070105502A1
公开(公告)日：2007-05-10
申请号：US11619174
申请日：2007-01-02
申请人： Nainesh Agarwal , Anant Sahai , John Tsitsiklis
发明人： Nainesh Agarwal , Anant Sahai , John Tsitsiklis
IPC分类号： H04B1/00 , H04B17/00
CPC分类号： G01S19/21 , H04B1/1036
摘要： System and method for mitigating the effects of narrowband noise in a location-determining signal are provided, wherein the location-determining signal is associated with a periodic reference signal, the embodiments include identifying a set of noisy frequencies in the signal, determining a set of frequencies to be removed, and removing the set of frequencies from either the location-determining signal or the reference signal, thereby removing the effects of narrowband noise from the location-determining signal.
摘要翻译：提供了一种用于减轻位置确定信号中的窄带噪声的影响的系统和方法，其中所述位置确定信号与周期性参考信号相关联，所述实施例包括识别信号中的一组噪声频率，确定一组要移除的频率，以及从位置确定信号或参考信号中去除该组频率，从而从位置确定信号中消除窄带噪声的影响。

9. 发明授权

US07177614B2 Narrowband noise mitigation in location-determining signal processing 有权
标题翻译：位置确定信号处理中的窄带噪声减轻
公开(公告)号：US07177614B2
公开(公告)日：2007-02-13
申请号：US10334683
申请日：2002-12-31
申请人： Nainesh Agarwal , Anant Sahai , John Tsitsiklis
发明人： Nainesh Agarwal , Anant Sahai , John Tsitsiklis
IPC分类号： H04B1/10
CPC分类号： G01S19/21 , H04B1/1036
摘要： System and method for mitigating the effects of narrowband noise in a location-determining signal are provided, wherein the location-determining signal is associated with a periodic reference signal, the embodiments include identifying a set of noisy frequencies in the signal, determining a set of frequencies to be removed, and removing the set of frequencies from either the location-determining signal or the reference signal, thereby removing the effects of narrowband noise from the location-determining signal.
摘要翻译：提供了一种用于减轻位置确定信号中的窄带噪声的影响的系统和方法，其中所述位置确定信号与周期性参考信号相关联，所述实施例包括识别信号中的一组噪声频率，确定一组要移除的频率，以及从位置确定信号或参考信号中去除该组频率，从而从位置确定信号中消除窄带噪声的影响。

10. 发明授权

US06900758B1 System, method, apparatus and means for constructing building tomography and timing information 失效
标题翻译：建筑层析成像和定时信息的系统，方法，装置和方法
公开(公告)号：US06900758B1
公开(公告)日：2005-05-31
申请号：US10272441
申请日：2002-10-16
申请人： Wallace Mann , Anant Sahai
发明人： Wallace Mann , Anant Sahai
IPC分类号： G01S19/05 , G01S1/00 , G01S19/11 , G01S5/02 , H04B7/185
CPC分类号： G01S19/22 , G01S19/07 , G01S19/25 , G01S19/41
摘要： A server provides GPS aiding data to mobile GPS receivers are provided with an enclosed environment (e.g., within a large building) where the received GPS signal is likely to be weak or suffer multipath signal interference. The server receives GPS signals from one or more antennas within the enclosed environment and measures the multipath error in the vicinity of each antenna. Using the multipath error data for various satellite positions at various times, the server creates a delay model for the enclosed environment to generate GPS aiding data for the mobile GPS receivers. A generic delay model can be created that is applicable to similarly constructed buildings.
摘要翻译：服务器向移动GPS接收机提供GPS辅助数据，其中接收到的GPS信号可能较弱或遭受多路径信号干扰的封闭环境（例如，在大型建筑物内）。服务器从封闭环境内的一个或多个天线接收GPS信号，并测量每个天线附近的多径误差。在不同时间使用多种卫星位置的多路径错误数据，服务器为封闭环境创建延迟模型，以生成移动GPS接收机的GPS辅助数据。可以创建适用于类似建筑物的通用延迟模型。

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