公开(公告)号：US07286083B2

公开(公告)日：2007-10-23

申请号：US11304470

申请日：2005-12-15

申请人： Gang Xie ,  Shreeram Jambulingam

发明人： Gang Xie ,  Shreeram Jambulingam

IPC分类号： G01S1/00 ,  G01C21/00

CPC分类号： G01S19/20

摘要： A method for improving fault detection and exclusion of a GPS receiver is provided. The method determines pseudorange measurement residuals of tracked signals, divides the signals into two groups based on whether each signal has a higher or lower probability of being a failure, and estimates a residual bias using only the lower probability group of signals. The method further removes the residual bias from all calculated residuals, and compares each range residual to one of three different thresholds. A tighter threshold is applied to positive residuals of the group of signals with higher failure probability than to the group of signals with lower failure probability. A further tighter threshold is applied to negative residuals of the group of signals having higher failure probability. The method then determines PVT values of the GPS receiver utilizing range measurements of signals whose measurement residual magnitudes are less than their corresponding threshold values.

公开(公告)号：US20130069821A1

公开(公告)日：2013-03-21

申请号：US13239318

申请日：2011-09-21

申请人： Shreeram Jambulingam ,  Mangesh Chansarkar

发明人： Shreeram Jambulingam ,  Mangesh Chansarkar

IPC分类号： G01S19/40

CPC分类号： G01S19/50

摘要： The present invention is related to location positioning systems, and more particularly, to a method and apparatus for making accuracy improvements to a GPS receiver's navigation calculations. According to a first aspect, the invention includes maintaining a table of height attributes for major cities and urban areas around the world (contour table) in the GNSS chipset. The information in the table preferably includes latitude, longitude of the city along with height attributes of those cities, such as the average, min, max height and region boundary etc. Additional information such as average gradient could also be saved in the table. According to further aspects, when GPS signals are degraded in environments such as urban canyons, the height information can be obtained from the table and used to improve the navigation solution.

摘要翻译： 本发明涉及位置定位系统，更具体地，涉及一种用于对GPS接收机的导航计算进行精度改进的方法和装置。 根据第一方面，本发明包括维护GNSS芯片组中的世界主要城市和城市地区的高度属性表（轮廓表）。 表中的信息最好包括城市的纬度，经度以及这些城市的高度属性，如平均值，最小值，最大高度和区域边界等。还可以在表格中保存平均梯度等附加信息。 根据进一步的方面，当GPS信号在诸如城市峡谷的环境中劣化时，可以从表中获得高度信息，并用于改进导航解决方案。

公开(公告)号：US08736487B2

公开(公告)日：2014-05-27

申请号：US13239318

申请日：2011-09-21

申请人： Shreeram Jambulingam ,  Mangesh Chansarkar

发明人： Shreeram Jambulingam ,  Mangesh Chansarkar

IPC分类号： G01S19/40

CPC分类号： G01S19/50

摘要： The present invention is related to location positioning systems, and more particularly, to a method and apparatus for making accuracy improvements to a GPS receiver's navigation calculations. According to a first aspect, the invention includes maintaining a table of height attributes for major cities and urban areas around the world (contour table) in the GNSS chipset. The information in the table preferably includes latitude, longitude of the city along with height attributes of those cities, such as the average, min, max height and region boundary etc. Additional information such as average gradient could also be saved in the table. According to further aspects, when GPS signals are degraded in environments such as urban canyons, the height information can be obtained from the table and used to improve the navigation solution.

摘要翻译： 本发明涉及位置定位系统，更具体地，涉及一种用于对GPS接收机的导航计算进行精度改进的方法和装置。 根据第一方面，本发明包括维护GNSS芯片组中的世界主要城市和城市地区的高度属性表（轮廓表）。 表中的信息最好包括城市的纬度，经度以及这些城市的高度属性，如平均值，最小值，最大高度和区域边界等。还可以在表格中保存平均梯度等附加信息。 根据进一步的方面，当GPS信号在诸如城市峡谷的环境中劣化时，可以从表中获得高度信息，并用于改进导航解决方案。

公开(公告)号：US20070139263A1

公开(公告)日：2007-06-21

申请号：US11304470

申请日：2005-12-15

申请人： Gang Xie ,  Shreeram Jambulingam

发明人： Gang Xie ,  Shreeram Jambulingam

IPC分类号： G01S5/14

CPC分类号： G01S19/20

摘要： A method for improving fault detection and exclusion of a GPS receiver is provided. The method determines pseudorange measurement residuals of tracked signals, divides the signals into two groups based on whether each signal has a higher or lower probability of being a failure, and estimates a residual bias using only the lower probability group of signals. The method further removes the residual bias from all calculated residuals, and compares each range residual to one of three different thresholds. A tighter threshold is applied to positive residuals of the group of signals with higher failure probability than to the group of signals with lower failure probability. A further tighter threshold is applied to negative residuals of the group of signals having higher failure probability. The method then determines PVT values of the GPS receiver utilizing range measurements of signals whose measurement residual magnitudes are less than their corresponding threshold values.

摘要翻译： 提供了一种用于改进GPS接收机的故障检测和排除的方法。 该方法确定跟踪信号的伪距测量残差，基于每个信号是否具有较高或较低的故障概率，将信号分成两组，并且仅使用信号的较低概率组来估计残留偏差。 该方法进一步从所有计算的残差中去除残留偏差，并将每个范围残差与三个不同阈值之一进行比较。 对于具有较高故障概率的信号组的正残差应用更严格的阈值，而不是具有较低故障概率的信号组。 更严格的阈值被应用于具有较高故障概率的信号组的负残差。 该方法然后使用测量残余量小于其相应阈值的信号的范围测量来确定GPS接收机的PVT值。