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1. 发明申请

WO2003023440A2 SYSTEM AND METHOD TO ESTIMATE THE LOCATION OF A RECEIVER IN A MULTI-PATH ENVIRONMENT 审中-公开
标题翻译：用于在多路径环境中估计接收器位置的系统和方法
公开(公告)号：WO2003023440A2
公开(公告)日：2003-03-20
申请号：PCT/US2002/028717
申请日：2002-09-07
申请人： ENUVIS, INC.
发明人： STONE, Jesse , CASADEI, Stefano , MANN, Wallace , VAN ROY, Benjamin
IPC分类号： G01S
CPC分类号： G01S11/10 , G01S19/22 , G01S19/30 , G01S19/42 , G01S19/50 , G01S19/52
摘要： System and method to determine the location of a receiver in a multipath environment are provided. The received signal is correlated with the reference signals associated with the transmitting sources. Each correlation function is processed to derive various types of signal constraints, such as probability densities and uncertainty regions or intervals. In some embodiments, these constraints are for the code-phases and the Doppler frequencies. These signal constraints are transformed into constraints on the receiver variables and then fused together into a unified receiver constraint. A-priori constraints, such as constraints on the location of the receiver or the timestamp, may be incorporated into the unified receiver constraint. Some embodiments estimate a location based also on the estimated Doppler frequency. The constraints used by the invention are based on models of multipath effects and are geared towards mitigating these effects. In one of these models, a probability density for code-phase is obtained by convolving a gaussian distribution with an exponential distribution that describes the extra delay introduced by multipath. Another approach is based on identifying outliers in the set of code-phases. In other approaches, uncertainty region constraints and probability densities are combined. The present invention achieves faster and more sensitive signal acquisition and higher location accuracy in multipath environment, without compromising performance in other environments.
摘要翻译：提供了确定多路径环境中的接收器的位置的系统和方法。接收到的信号与与发射源相关的参考信号相关。处理每个相关函数以导出各种类型的信号约束，例如概率密度和不确定性区域或区间。在一些实施例中，这些约束是针对码相位和多普勒频率的。这些信号约束被转换成接收机变量的约束，然后融合在一起成为统一的接收机约束。先验约束，例如对接收机位置或时间戳的约束，可以并入统一的接收机约束中。一些实施例还基于估计的多普勒频率估计位置。本发明使用的约束基于多路径效应模型，并且旨在减轻这些影响。在这些模型之一中，通过用描述由多径引入的额外延迟的指数分布对高斯分布进行卷积来获得码相的概率密度。另一种方法是基于识别代码阶段中的异常值。在其他方法中，不确定性区域约束和概率密度相结合。本发明在多路径环境中实现更快和更灵敏的信号采集和更高的定位精度，而不会影响其他环境中的性能。

2. 发明公开

EP1407285A2 SIGNAL ACQUISITION USING DATA BIT INFORMATION 审中-公开
标题翻译： SIGNAL收购数据比特的信息
公开(公告)号：EP1407285A2
公开(公告)日：2004-04-14
申请号：EP02744559.2
申请日：2002-06-21
申请人： Enuvis, Inc.
发明人： SAHAI, Anant , MANN, Wallace , CHOU, Andrew , VAN ROY, Benjamin
IPC分类号： G01S1/00
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.

3. 发明申请

WO2003001234A3 EXTRACTING FINE-TUNED ESTIMATES FROM CORRELATION FUNCTIONS EVALUATED AT A LIMITED NUMBER OF VALUES 审中-公开
公开(公告)号：WO2003001234A3
公开(公告)日：2003-01-03
申请号：PCT/US2002/019964
申请日：2002-06-21
申请人： ENUVIS, INC. , SAHAI, Anant , TSITSIKLIS, John , CASADEI, Stefano , CHOU, Andrew , VAN ROY, Benjamin , STONE, Jesse, R
发明人： SAHAI, Anant , TSITSIKLIS, John , CASADEI, Stefano , CHOU, Andrew , VAN ROY, Benjamin , STONE, Jesse, R
IPC分类号： G01S5/14
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.

4. 发明申请

WO2003001232A2 LOCATION-DETERMINATION METHOD AND APPARATUS 审中-公开
标题翻译：位置确定方法和装置
公开(公告)号：WO2003001232A2
公开(公告)日：2003-01-03
申请号：PCT/US2002/003899
申请日：2002-02-11
申请人： ENUVIS, INC. , VAN ROY, Benjamin , TSITSIKLIS, John , CHOU, Andrew
发明人： VAN ROY, Benjamin , TSITSIKLIS, John , CHOU, Andrew
IPC分类号： G01S
CPC分类号： G01S19/09 , G01S19/42 , G01S2205/008
摘要： Some embodiments of the invention provide a location-determination system that includes a number of transmitters and at least one receiver. Based on a reference signal received by the receiver, this location-determination system identifies an estimated location of the receiver within a region. In some embodiments, the system selects one or more locations within the region. For each particular selected location, the system calculates a metric value that quantifies the similarity between the received signal and the signal that the receiver could expect to receive at the particular location, in the absence or presence of interference. Based on the calculated metric value or values, the system identifies the estimated location of the receiver.
摘要翻译：本发明的一些实施例提供一种位置确定系统，其包括多个发射机和至少一个接收机。基于由接收器接收的参考信号，该位置确定系统识别接收机在一个区域内的估计位置。在一些实施例中，系统选择区域内的一个或多个位置。对于每个特定的所选择的位置，系统计算量度值，其在不存在或存在干扰的情况下量化接收信号与接收机可能期望在特定位置接收的信号之间的相似度。基于计算的度量值或值，系统识别接收机的估计位置。

5. 发明公开

EP1425605A2 SYSTEM AND METHOD TO ESTIMATE THE LOCATION OF A RECEIVER IN A MULTI-PATH ENVIRONMENT 审中-公开
标题翻译：系统和方法确定接收器的位置在多环境
公开(公告)号：EP1425605A2
公开(公告)日：2004-06-09
申请号：EP02783974.5
申请日：2002-09-07
申请人： Enuvis, Inc.
发明人： STONE, Jesse , CASADEI, Stefano , MANN, Wallace , VAN ROY, Benjamin
IPC分类号： G01S5/14
CPC分类号： G01S11/10 , G01S19/22 , G01S19/30 , G01S19/42 , G01S19/50 , G01S19/52
摘要： System and method to determine the location of a receiver in a multipath environment are provided. The received signal is correlated with the reference signals associated with the transmitting sources. Each correlation function is processed to derive various types of signal constraints, such as probability densities and uncertainty regions or intervals. In some embodiments, these constraints are for the code-phases and the Doppler frequencies. These signal constraints are transformed into constraints on the receiver variables and then fused together into a unified receiver constraint. A-priori constraints, such as constraints on the location of the receiver or the timestamp, may be incorporated into the unified receiver constraint. Some embodiments estimate a location based also on the estimated Doppler frequency. The constraints used by the invention are based on models of multipath effects and are geared towards mitigating these effects. In one of these models, a probability density for code-phase is obtained by convolving a gaussian distribution with an exponential distribution that describes the extra delay introduced by multipath. Another approach is based on identifying outliers in the set of code-phases. In other approaches, uncertainty region constraints and probability densities are combined. The present invention achieves faster and more sensitive signal acquisition and higher location accuracy in multipath environment, without compromising performance in other environments.

6. 发明公开

EP1402280A2 METHOD FOR EXTRACTING FINE-TUNED ESTIMATES FROM CORRELATION FUNCTIONS 审中-公开
标题翻译：提取方法关联函数的微调，估计
公开(公告)号：EP1402280A2
公开(公告)日：2004-03-31
申请号：EP02747956.7
申请日：2002-06-21
申请人： Enuvis, Inc.
发明人： SAHAI, Anant , TSITSIKLIS, John , CASADEI, Stefano , CHOU, Andrew , VAN ROY, Benjamin , STONE, Jesse, R
IPC分类号： G01S5/00
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. 发明申请

WO2003001235A3 DETERMINING LOCATION INFORMATION FROM SAMPLED POSITIONING SIGNALS 审中-公开
公开(公告)号：WO2003001235A3
公开(公告)日：2003-01-03
申请号：PCT/US2002/021178
申请日：2002-06-21
申请人： ENUVIS, INC. , SAHAI, Anant , TSITSIKLIS, John , VAN ROY, Benjamin , CHOU, Andrew , MANN, Wallace , STONE, Jesse, R. , FONG, WungKum
发明人： SAHAI, Anant , TSITSIKLIS, John , VAN ROY, Benjamin , CHOU, Andrew , MANN, Wallace , STONE, Jesse, R. , FONG, WungKum
IPC分类号： G01S1/04
摘要： According to one aspect of the invention, sampled data that is received from a receiver is divided into segments of data of increasing length. A current value range for a delay value and a current value range for a modulation frequency value are calculated relative to each signal source from a set of signal sources that are overhead the signal receiver. An estimate for the delay value and an estimate for the modulation frequency value are calculated by iteratively updating the current value range for the delay value and for the modulation frequency value. The iterative update of the current value range for the delay value and for the modulation frequency value is performed overthe set of signal sources and over the segments of data of increasing length. According to another aspect of the technique, for each signal source, I and Q correlation integrals and their magnitude value are calculated corresponding to the estimate of the modulation frequency value and the estimate of the delay value. In addition, for each signal source, I and Q correlation integrals and thier magnitude values are calculated corresponding to a set of delay values that surround the estimate of the delay value. A shape of a magnitude-curve is interpolated using the magnitude values corresponding to the estimate of the delay value and corresponding to the set of delay values that surround the estimate of the delay value. 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.

8. 发明申请

WO2003001230A3 SIGNAL ACQUISITION USING DATA BIT INFORMATION 审中-公开
公开(公告)号：WO2003001230A3
公开(公告)日：2003-01-03
申请号：PCT/US2002/019894
申请日：2002-06-21
申请人： ENUVIS, INC. , SAHAI, Anant , MANN, Wallace , CHOU, Andrew , VAN ROY, Benjamin
发明人： SAHAI, Anant , MANN, Wallace , CHOU, Andrew , VAN ROY, Benjamin
IPC分类号： G01S5/14
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.

9. 发明公开

EP1344085A2 LOCATION-DETERMINATION METHOD AND APPARATUS 审中-公开
标题翻译：装置和方法用于确定位置
公开(公告)号：EP1344085A2
公开(公告)日：2003-09-17
申请号：EP01999830.1
申请日：2001-12-03
申请人： Enuvis, Inc.
发明人： CHOU, Andrew , VAN ROY, Benjamin , TSITSIKLIS, John
IPC分类号： G01S5/14
CPC分类号： G01S5/02 , G01S5/0036 , G01S19/06 , G01S19/09 , G01S19/24 , G01S19/252 , G01S19/30 , G01S19/42
摘要： Some embodiments of the invention provide a location-determination system that includes several transmitters and at least one receiver. Each transmitter transmits a signal that includes a unique periodically-repeating component, and the receiver receives a reference signal. Based on the received reference signal, the location-determination system identifies an estimated location of the receiver as follows. For each transmitter in a set of transmitters, the system computes a phase offset between the received reference signal and a replica of the transmitter's periodically-repeating component. The system also identifies an approximate location of the receiver and an approximate receive time for the received signal. The system then uses the identified approximate location and time, and the computed phase offsets, to compute pseudoranges for the set of transmitters. Finally, the system identifies the estimated location of the receiver by using the computed pseudoranges.

10. 发明申请

WO2003023440A3 SYSTEM AND METHOD TO ESTIMATE THE LOCATION OF A RECEIVER IN A MULTI-PATH ENVIRONMENT 审中-公开
公开(公告)号：WO2003023440A3
公开(公告)日：2003-03-20
申请号：PCT/US2002/028717
申请日：2002-09-07
申请人： ENUVIS, INC.
发明人： STONE, Jesse , CASADEI, Stefano , MANN, Wallace , VAN ROY, Benjamin
IPC分类号： G01S5/14
摘要： System and method to determine the location of a receiver in a multipath environment are provided. The received signal is correlated with the reference signals associated with the transmitting sources. Each correlation function is processed to derive various types of signal constraints, such as probability densities and uncertainty regions or intervals. In some embodiments, these constraints are for the code-phases and the Doppler frequencies. These signal constraints are transformed into constraints on the receiver variables and then fused together into a unified receiver constraint. A-priori constraints, such as constraints on the location of the receiver or the timestamp, may be incorporated into the unified receiver constraint. Some embodiments estimate a location based also on the estimated Doppler frequency. The constraints used by the invention are based on models of multipath effects and are geared towards mitigating these effects. In one of these models, a probability density for code-phase is obtained by convolving a gaussian distribution with an exponential distribution that describes the extra delay introduced by multipath. Another approach is based on identifying outliers in the set of code-phases. In other approaches, uncertainty region constraints and probability densities are combined. The present invention achieves faster and more sensitive signal acquisition and higher location accuracy in multipath environment, without compromising performance in other environments.

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