公开(公告)号：US5809064A

公开(公告)日：1998-09-15

申请号：US691351

申请日：1996-08-02

申请人： Patrick Fenton ,  Albert J. Van Dierendonck

发明人： Patrick Fenton ,  Albert J. Van Dierendonck

IPC分类号： G01S1/00 ,  H04B1/7085 ,  H04B1/709 ,  H04B1/69 ,  H04L27/30

CPC分类号： H04B1/7085 ,  G01S19/215 ,  G01S19/22 ,  G01S19/30 ,  G01S19/37 ,  G01S19/426 ,  H04B1/709 ,  G01S19/29

摘要： A receiver for pseudorandom noise (PRN) encoded signals consisting of a sampling circuit, multiple carrier and code synchronizing circuits, and multiple digital autocorrelators. The sampling circuit provides digital samples of a received composite signal to each of the several receiver channel circuits. The synchronizing circuits are preferably non-coherent, in the sense that they track any phase shifts in the received signal and adjust the frequency and phase of a locally generated carrier reference signal accordingly, even in the presence of Doppler or ionospheric distortion. The autocorrelators in each channel form a delay lock loop (DLL) which correlates the digital samples of the composite signal with locally generated PRN code values to produce a plurality of (early, late), or (punctual, early-minus-late) correlation signals. The time delay spacing between the (early, late), and (punctual, early-minus-late) correlation signals are dynamically adjusted, such that in an initial acquisition mode, the delay spacing is relatively wide, on the order of approximately one PRN code chip time; once PRN code lock is achieved, the code delay spacing is narrowed to a fraction of a PRN code chip time.

公开(公告)号：US5495499A

公开(公告)日：1996-02-27

申请号：US383725

申请日：1995-02-03

申请人： Patrick Fenton ,  Albert J. Van Dierendonck

发明人： Patrick Fenton ,  Albert J. Van Dierendonck

IPC分类号： G01S1/00 ,  H04B1/7085 ,  H04B1/709 ,  H04L9/00

CPC分类号： H04B1/7085 ,  G01S19/215 ,  G01S19/22 ,  G01S19/30 ,  G01S19/37 ,  G01S19/426 ,  H04B1/709 ,  G01S19/29

摘要： A receiver for pseudorandom noise (PRN) encoded signals consisting of a sampling circuit, multiple carrier and code synchronizing circuits, and multiple digital autocorrelators. The sampling circuit provides digital samples of a received composite signal to each of the several receiver channel circuits. The synchronizing circuits are preferably non-coherent, in the sense that they track any phase shifts in the received signal and adjust the frequency and phase of a locally generated carrier reference signal accordingly, even in the presence of Doppler or ionospheric distortion. The autocorrelators in each channel form a delay lock loop (DLL) which correlates the digital samples of the composite signal with locally generated PRN code values to produce a plurality of (early, late), or (punctual, early-minus-late) correlation signals. The time delay spacing between the (early, late), and (punctual, early-minus-late) correlation signals are dynamically adjusted, such that in an initial acquisition mode, the delay spacing is relatively wide, on the order of approximately one PRN code chip time; once PRN code lock is achieved, the code delay spacing is narrowed to a fraction of a PRN code chip time.

摘要翻译： 用于由抽样电路，多载波和码同步电路以及多个数字自相关器组成的伪随机噪声（PRN）编码信号的接收机。 采样电路将接收到的复合信号的数字样本提供给几个接收机通道电路中的每一个。 在同步电路优选地是非相干的，即在它们跟踪接收信号中的任何相移并相应地调整本地产生的载波参考信号的频率和相位的意义上，即使在存在多普勒或电离层失真的情况下也是如此。 每个通道中的自相关器形成延迟锁定环（DLL），其将复合信号的数字样本与本地生成的PRN码值相关联，以产生多个（早，晚）或（准时，早 - 减 - 晚）相关 信号。 （早，晚）和（准时，早 - 晚 - 晚）相关信号之间的时间延迟间隔被动态调整，使得在初始采集模式中，延迟间隔相对较宽，约为一个PRN 代码片时间; 一旦实现了PRN码锁定，码延迟间隔被缩小到PRN码片片时间的一小部分。

公开(公告)号：US5390207A

公开(公告)日：1995-02-14

申请号：US217768

申请日：1994-03-24

申请人： Patrick Fenton ,  Albert J. Van Dierendonck

发明人： Patrick Fenton ,  Albert J. Van Dierendonck

IPC分类号： G01S1/00 ,  H04B1/7085 ,  H04B1/709 ,  G01S5/02 ,  H04B7/185

CPC分类号： H04B1/7085 ,  G01S19/215 ,  G01S19/22 ,  G01S19/30 ,  G01S19/37 ,  G01S19/426 ,  H04B1/709 ,  G01S19/29

摘要： A receiver for pseudorandom noise (PRN) encoded signals consisting of a sampling circuit, multiple carrier and code synchronizing circuits, and multiple digital autocorrelators. The sampling circuit provides digital samples of a received composite signal to each of the several receiver channel circuits. The synchronizing circuits are preferably non-coherent, in the sense that they track any phase shifts in the received signal and adjust the frequency and phase of a locally generated carrier reference signal accordingly, even in the presence of Doppler or ionospheric distortion. The autocorrelators in each channel form a delay lock loop (DLL) which correlates the digital samples of the composite signal with locally generated PRN code values to produce a plurality of (early, late), or (punctual, early-minus-late) correlation signals. Thus, during an initial acquisition mode, the delay spacing is relatively wide, on the order of approximately one PRN code chip time. However, once PRN code synchronism has been achieved, the code delay spacing is narrowed, to a fraction of a PRN code chip time. There are several advantages to this arrangement, especially in environments wherein multipath distortion in the received composite signal is of the same order of magnitude as a PRN code chip time.

摘要翻译： 用于由抽样电路，多载波和码同步电路以及多个数字自相关器组成的伪随机噪声（PRN）编码信号的接收机。 采样电路将接收到的复合信号的数字样本提供给几个接收机通道电路中的每一个。 同步电路优选地是非相干的，即在它们跟踪接收信号中的任何相移并相应地调整本地产生的载波参考信号的频率和相位的意义上，即使在存在多普勒或电离层失真的情况下也是如此。 每个通道中的自相关器形成延迟锁定环（DLL），其将复合信号的数字样本与本地生成的PRN码值相关联，以产生多个（早，晚）或（准时，早 - 减 - 晚）相关 信号。 因此，在初始采集模式期间，延迟间隔相对较宽，大约为一个PRN码片时间。 然而，一旦实现了PRN代码同步，则代码延迟间隔变窄，达到PRN码片片时间的一小部分。 这种布置有几个优点，特别是在接收到的复合信号中的多径失真与PRN码片时间具有相同数量级的环境中。

公开(公告)号：US06184822B2

公开(公告)日：2001-02-06

申请号：US09138932

申请日：1998-08-24

申请人： Patrick C. Fenton ,  Albert J. Van Dierendonck

发明人： Patrick C. Fenton ,  Albert J. Van Dierendonck

IPC分类号： H04B7185

CPC分类号： G01S19/30 ,  G01S19/32

摘要： A GPS receiver that acquires and tracks a split-C/A code separately aligns with the received signal the phases of a locally-generated 10.23 MHz square wave, which can be thought of as a 20.46 MHz square-wave code, and a locally-generated 1.023 MHz C/A code. The receiver first aligns the phase of the locally-generated square-wave code with the received signal, and tracks one of the multiple peaks of the split-C/A code autocorrelation function. It then shifts the phase of the locally-generated C/A code with respect to the phase of the locally-generated square-wave code, to align the local and the received C/A codes and position the correlators on the center peak of the split-C/A. The receiver then tracks the center peak directly, using a locally-generated split-C/A code.

摘要翻译： 获取和跟踪分割C / A码的GPS接收机分别与接收到的信号一致，本地生成的10.23MHz方波的相位可以被认为是20.46MHz方波码， 生成1.023 MHz C / A码。 接收机首先将本地生成的方波码的相位与接收信号对准，并且跟踪分割C / A码自相关函数的多个峰值之一。 然后，它相对于本地产生的方波码的相位移动本地生成的C / A码的相位，以对准本地和接收的C / A码，并将相关器定位在 split-C / A。 接收机然后使用本地生成的分割C / A码直接跟踪中心峰。

公开(公告)号：US06243409B1

公开(公告)日：2001-06-05

申请号：US08892871

申请日：1997-07-15

申请人： Patrick C. Fenton ,  Albert J. Van Dierendonck

发明人： Patrick C. Fenton ,  Albert J. Van Dierendonck

IPC分类号： H04L2730

CPC分类号： G01S19/22 ,  G01S19/30

摘要： GNSS receiver includes a subsystem that reduces the adverse effects of multipath signals on punctual and early-minus-late correlation measurements by making the correlation measurements using a “blanked-PRN code.” The blanked-PRN code is all zeros except for adjacent positive and negative short pulses that occur at every code bit transition in a locally-generated PRN code. Using the blanked-PRN code, the receiver makes non-zero correlation measurements only near the code bit transitions in the local PRN code. If the local PRN code and the PRN code in the received GNSS satellite signal are closely aligned, the non-zero correlation measurements are made at the times of the bit transitions in the received PRN code. The contributions to the correlation measurements of the multipath signals that do not have bit transitions during the adjacent positive and negative pulses in the blanked-PRN code cancel when the correlation measurements are accumulated—since these multipath signals are constant during the pulse times. The GNSS receiver includes blanked-PRN code logic that produces the blanked-PRN code from the locally-generated PRN code. The blanked-PRN code logic thus produces a code that is zero-valued except for the adjacent pulses. Alternatively, the blanked-PRN code logic produces the zero-valued portions of the code by selectively disabling the blanked-code correlators in between the code bit transitions in the local PRN code. The result is the same, namely, a system that produces non-zero correlation measurements near the code bit transitions in the local PRN code.

摘要翻译： GNSS接收机包括通过使用“空白PRN码”进行相关测量来减少多径信号对准时和早期 - 迟迟相关测量的不利影响的子系统。 除了在本地生成的PRN代码中的每个代码位转换处发生的相邻正和负短脉冲之外，空白PRN代码全为零。 使用空白PRN码，接收机仅在本地PRN码中的码位转换附近进行非零相关测量。 如果接收的GNSS卫星信号中的本地PRN码和PRN码紧密对齐，则在接收的PRN码中的位转换时进行非零相关测量。 当相关测量被累积时，对消隐PRN码中的相邻正和负脉冲期间没有位转换的多径信号的相关测量的贡献由于这些多径信号在脉冲时间期间是恒定的。 GNSS接收机包括空白PRN码逻辑，从本地生成的PRN码产生空白的PRN码。 因此，空白的PRN代码逻辑产生除了相邻脉冲之外的零值的代码。 或者，空白PRN代码逻辑通过在本地PRN代码中的代码位转换之间选择性地禁用空白代码相关器来产生代码的零值部分。 结果是相同的，即在本地PRN码中的码位转换附近产生非零相关测量的系统。