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：US07315277B2

公开(公告)日：2008-01-01

申请号：US10425271

申请日：2003-04-29

申请人： Robert L. Henderson ,  Mark A. Asher

发明人： Robert L. Henderson ,  Mark A. Asher

IPC分类号： G01S5/14

CPC分类号： G01S19/21 ,  G01S19/37

摘要： Disclosed is a system and method for reducing a bit-depth requirement for an A/D converter in a GPS receiver having an antenna for receiving an analog input signal and a low noise amplifier for amplifying the input signal, comprising a filter for filtering about a bandwidth B the amplified signal; a down-conversion module centering the frequency of the filtered signal about a center frequency f0; an automatic gain controller (AGC) for setting a set point of the input signal; an adder for adding noise to the gain controlled signal, said noise based upon the bandwidth B and center frequency f0; and an analog to digital (A/D) converter for converting the added noise signal to a digital signal, wherein the noise added to the gain controlled signal reduces the bit depth requirement of the A/D converter.

摘要翻译： 公开了一种用于减少具有用于接收模拟输入信号的天线和用于放大输入信号的低噪声放大器的GPS接收机中的A / D转换器的位深度要求的系统和方法，包括用于过滤关于 带宽B放大信号; 下变频模块以滤波信号的频率为中心，围绕中心频率f 0 <0; 用于设置输入信号的设定点的自动增益控制器（AGC）; 用于将噪声加到增益控制信号的加法器，基于带宽B和中心频率f 0的所述噪声; 以及用于将附加的噪声信号转换为数字信号的模数（A / D）转换器，其中添加到增益控制信号的噪声降低了A / D转换器的位深度要求。

公开(公告)号：US4700307A

公开(公告)日：1987-10-13

申请号：US514210

申请日：1983-07-11

申请人： Barend Mons ,  Donald H. Flowers ,  Robert L. Henderson

发明人： Barend Mons ,  Donald H. Flowers ,  Robert L. Henderson

IPC分类号： G01C21/00 ,  G05D1/02

CPC分类号： G01C21/005 ,  G05D1/0202

摘要： A method of navigating an airborne vehicle using observation of linear features such as roads, railroads, rivers or the like. Maps of linear features in several discrete areas along an intended flight path are prepared and entered into an on-board computer memory. The vehicle typically uses an inertial navigation system during flight from the origin to the first mapped area. Imaging sensors and on-board processing detect linear features as the vehicle approaches or passes over them. The sensed feature pattern network is compared to the reference mapped feature network to update the inertial navigation system to generate guidance commands. Frequent updates at other mapped areas keep the vehicle on course. This system is also capable of navigation updates from single linear features when the flight path is fairly well known, and of tracking a linear feature for terminal guidance. In these cases, only a small number of feature parameters need to be stored, rather than an area map. Linear feature navigation can be used by any manned or unmanned airborne vehicle which has the on-board capability to detect the required features.

摘要翻译： 使用诸如道路，铁路，河流等的线性特征的观察来导航机载车辆的方法。 沿着预期飞行路径的几个离散区域中的线性特征的映射被准备并输入到机载计算机存储器中。 车辆通常在从起点到第一映射区域的飞行中使用惯性导航系统。 成像传感器和车载处理在车辆接近或越过它们时检测线性特征。 将感测的特征图案网络与参考映射特征网络进行比较，以更新惯性导航系统以产生指导命令。 其他地图区域的频繁更新可保持车辆正常运行。 当飞行路径相当熟知时，该系统还能够从单一线性特征导航更新，并且跟踪终端指导的线性特征。 在这些情况下，只需要存储少量的特征参数，而不是存储区域图。 线性特征导航可以由具有车载能力的任何载人或无人机载机使用，以检测所需的特征。