公开(公告)号：US06724343B2

公开(公告)日：2004-04-20

申请号：US10422544

申请日：2003-04-24

申请人： Mark S. Asher ,  Lloyd A. Linstrom ,  Robert L. Henderson ,  Dennis J. Duven

发明人： Mark S. Asher ,  Lloyd A. Linstrom ,  Robert L. Henderson ,  Dennis J. Duven

IPC分类号： B01S514

CPC分类号： G01S19/21 ,  G01S19/24 ,  G01S19/26

摘要： Disclosed is a system and method for increasing the weak signal recovery capability of a Global Positioning System (GPS) receiver correlating each of the plurality of digital signals by multiplying the I and Q phases by the carrier and code, adding a location offset, accumulating the results of the correlation, and latching the results until a predetermined time; coherent combining the accumulated results at the predetermined time; non-coherent combining the coherent combined results for a time period sufficient to raise a correlation peak to a predetermined point above a noise floor to produce a plurality of non-coherent bin observables; determining a maximum value of the plurality of bin observables and comparing the maximum value to predetermined threshold; determining grid locations of bin observables having maximum values greater than the predetermined threshold; determining a bi-quadratic surface using the grid locations; determining an argument maximum of the bi-quadratic surface; estimating epoch pseudorange and Doppler variables based on the argument maximum; estimating errors in at least one of position, velocity, orientation, user clock, frequency, and ionosphere states on the estimated epoch pseudorange and Doppler variables; and determining at least one of position, velocity and orientation by correcting for the estimated errors.

摘要翻译： 公开了一种用于增加全球定位系统（GPS）接收机的弱信号恢复能力的系统和方法，其通过将I和Q相位与载波和码相乘来相加多个数字信号中的每一个，添加位置偏移量， 相关的结果，并将结果锁定到预定时间; 在预定时间内相加组合累积结果; 将相干组合结果的非相干组合足够的时间段以将相关峰值提高到噪声本底以上的预定点，以产生多个非相干二叉管可观察值; 确定所述多个箱可观测值的最大值，并将所述最大值与预定阈值进行比较; 确定具有大于所述预定阈值的最大值的二进制可观察值的网格位置; 使用所述网格位置确定二次曲面; 确定双二次曲面的参数最大值; 基于参数最大值估计时代伪距和多普勒变量; 在估计的时代伪距和多普勒变量上估计位置，速度，方向，用户时钟，频率和电离层状态中的至少一个中的误差; 以及通过校正估计的误差来确定位置，速度和方向中的至少一个。

公开(公告)号：US06608589B1

公开(公告)日：2003-08-19

申请号：US09295544

申请日：1999-04-21

申请人： William S. Devereux ,  Robert J. Heins ,  Albert A. Chacos ,  Lloyd A. Linstrom ,  Mark S. Asher ,  Dennis J. Duven ,  Don M. Gruenbacher ,  Thomas L. Kusterer ,  Kim Strohbehn ,  Richard C. Morgan

发明人： William S. Devereux ,  Robert J. Heins ,  Albert A. Chacos ,  Lloyd A. Linstrom ,  Mark S. Asher ,  Dennis J. Duven ,  Don M. Gruenbacher ,  Thomas L. Kusterer ,  Kim Strohbehn ,  Richard C. Morgan

IPC分类号： G01S514

CPC分类号： G01S19/14 ,  G01C21/00 ,  G01S19/37 ,  G01S19/54

摘要： An autonomous navigation system for an orbital platform incorporating a global positioning system based navigation device optimized for low-Earth orbit and medium-Earth orbit applications including a 12-channel, GPS tracking application-specific integrated circuit operating in concert with a microprocessor implementing an extended Kalman filter and orbit propagator which autonomously generates estimates of position, velocity, and time to enable planing, prediction and execution of event-based commanding of mission operations.

摘要翻译： 一种用于轨道平台的自主导航系统，其结合了针对低地球轨道和中地球轨道应用而优化的全球定位系统的导航装置，包括与实施扩展的微处理器一致的12通道GPS跟踪应用专用集成电路 卡尔曼滤波器和轨道传播器，其自主地产生位置，速度和时间的估计，以实现对任务操作的基于事件的指挥的计划，预测和执行。

公开(公告)号：US06934630B2

公开(公告)日：2005-08-23

申请号：US10415541

申请日：2001-12-12

申请人： Lloyd A. Linstrom ,  Dennis J. Duven

发明人： Lloyd A. Linstrom ,  Dennis J. Duven

IPC分类号： G01S1/00 ,  G01S5/00 ,  G01S19/09 ,  G01S19/11 ,  G01S19/18 ,  G01S19/30 ,  G01C21/26

CPC分类号： G01S19/18 ,  G01S5/0036 ,  G01S19/09 ,  G01S19/30

摘要： A receiving station tracking system for receiving GPS data and tracking a mobile vehicle. The receiving station tracking system includes at least one processing stage receiving and processing at least a portion of the GPS data, and a control module receiving and filtering the processed GPS data and outputting at least one control signal in accordance with filtering results. The at least one control signal controls decreasing or increasing a quantity of processing stages of the at least one processing stage.

摘要翻译： 一种用于接收GPS数据并跟踪移动车辆的接收站跟踪系统。 接收站跟踪系统包括至少一个处理级，其接收和处理GPS数据的至少一部分，以及控制模块，接收和过滤处理的GPS数据，并根据过滤结果输出至少一个控制信号。 所述至少一个控制信号控制减少或增加所述至少一个处理级的处理级的数量。

公开(公告)号：US08325086B2

公开(公告)日：2012-12-04

申请号：US12767158

申请日：2010-04-26

申请人： Stephen J. Stafford ,  Mark S. Asher ,  Martin G. Sommerville ,  Lloyd A. Linstrom ,  Thomas L. Kusterer

发明人： Stephen J. Stafford ,  Mark S. Asher ,  Martin G. Sommerville ,  Lloyd A. Linstrom ,  Thomas L. Kusterer

IPC分类号： G01S19/42 ,  G01S19/38

CPC分类号： G01S19/28 ,  G01S19/37

摘要： Methods and systems to detect navigation signals, including to identify up to multiple range-Doppler hypotheses from each of j range-Doppler correlation grids based on a relatively low first threshold, generate navigation solutions from combinatorial sets of k of the identified hypotheses, evaluate the navigation solutions to identify plausible solutions, iteratively and combinatorially augment the plausible solutions with additional hypotheses from grids that are not represented in the corresponding k-hypotheses based navigation solutions, replace plausible solutions with corresponding augmented plausible solutions when appropriate, and select one of a plurality of plausible solutions as a best plausible solution, j and k being positive integers. Where a grid energy peak exceeds a second threshold, a corresponding hypothesis may be identified as a sole hypothesis for the corresponding navigation signal. The relatively low first threshold permits detection of weaker signals. Subsequent evaluations effectively transform a per-navigation-signal false alarm rate to per-navigation-solution false alarm rate.

摘要翻译： 检测导航信号的方法和系统，包括基于相对较低的第一阈值从j范围 - 多普勒相关网格中确定多达多范围多普勒假设，从识别的假设的k个组合集合中产生导航解， 导航解决方案，用于识别合理的解决方案，迭代地并组合地增加似乎合理的解决方案，其中来自不在相应的基于k-假设的导航解决方案中未表示的网格的附加假设，在适当时用相应的增强似然解决方案替换合理的解，并选择多个 最合理的解决方案是最合理的解决方案，j和k是正整数。 在电网能量峰值超过第二阈值的情况下，相应的假设可以被识别为相应导航信号的唯一假设。 相对较低的第一阈值允许检测较弱的信号。 随后的评估有效地将每导航信号的误报率变换为每导航解决方案的虚警率。

公开(公告)号：US20100271259A1

公开(公告)日：2010-10-28

申请号：US12767158

申请日：2010-04-26

申请人： Stephen J. Stafford ,  Mark S. Asher ,  Martin G. Sommerville ,  Lloyd A. Linstrom ,  Thomas L. Kusterer

发明人： Stephen J. Stafford ,  Mark S. Asher ,  Martin G. Sommerville ,  Lloyd A. Linstrom ,  Thomas L. Kusterer

IPC分类号： G01S19/38

CPC分类号： G01S19/28 ,  G01S19/37

摘要： Methods and systems to detect navigation signals, including to identify up to multiple range-Doppler hypotheses from each of j range-Doppler correlation grids based on a relatively low first threshold, generate navigation solutions from combinatorial sets of k of the identified hypotheses, evaluate the navigation solutions to identify plausible solutions, iteratively and combinatorially augment the plausible solutions with additional hypotheses from grids that are not represented in the corresponding k-hypotheses-based navigation solutions, replace plausible solutions with corresponding augmented plausible solutions when appropriate, and select one of a plurality of plausible solutions as a best plausible solution. Where a grid energy peak exceeds a second threshold, a corresponding hypothesis may be identified as a sole hypothesis for the corresponding navigation signal. The relatively low first threshold permits detection of weaker signals. Subsequent evaluations effectively transform a per-navigation-signal false alarm rate to per-navigation-solution false alarm rate.

摘要翻译： 检测导航信号的方法和系统，包括基于相对较低的第一阈值从j范围 - 多普勒相关网格中确定多达多范围多普勒假设，从识别的假设的k个组合集合中产生导航解， 导航解决方案，用于识别合理的解决方案，迭代地并组合地增加似乎合理的解决方案，其中来自网格的额外假设在相应的基于k-假设的导航解决方案中未被表示，并在合适的情况下用相应的增强似然解决方案代替合理的解决方案，并且选择 多个合理的解决方案是最好的合理解决方案。 在电网能量峰值超过第二阈值的情况下，相应的假设可以被识别为相应导航信号的唯一假设。 相对较低的第一阈值允许检测较弱的信号。 随后的评估有效地将每导航信号的误报率变换为每导航解决方案的虚警率。