利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

8 条记录 (耗时 0.057 秒)

    Navigation receiver with coupled signal-tracking channels
    7.
    发明授权
    Navigation receiver with coupled signal-tracking channels 失效
    具有耦合信号跟踪通道的导航接收器

    公开(公告)号：US5343209A

    公开(公告)日：1994-08-30

    申请号：US880135

    申请日：1992-05-07

    申请人： James W. Sennott ,  David Senffner

    发明人： James W. Sennott ,  David Senffner

    IPC分类号： G01S5/14 ,  G01S19/05 ,  G01S19/11 ,  G01S19/21 ,  G01S19/29 ,  G01S19/42 ,  G01S19/43 ,  G01S19/46 ,  G01S19/53 ,  G01S19/54 ,  G01S5/02 ,  G01C21/00 ,  G01S1/08

    CPC分类号： G01S19/53 ,  G01S19/42 ,  G01S19/43 ,  G01S19/54

    摘要： The navigation receiver with coupled-tracking channels is intended for use in radio navigation systems based on trilateration wherein the times of arrival of radio signals transmitted by a plurality of ground- or space-based terminals are measured by a user terminal and utilized by the user terminal in calculating its position and orientation. The coupled-tracking navigation receiver periodically measures carrier phase, carrier frequency, modulation phase, and carrier amplitude for all of the signals arriving at the receiving ports of the receiver and periodically estimates the present values of carrier phase, carrier frequency, and modulation phase for all of the received signals, the estimating process utilizing for each parameter estimate the parameter measurements for a plurality of the received signals properly combined in a statistically appropriate manner by taking into account the relative geometry of the line-of-sight paths, receiver clock time dynamics, and dynamics and motion constraints of the receiver platform, thereby obtaining better performance under poor signal reception conditions and more accurate estimates of carrier phase, carrier frequency, and modulation phase for each of the received signals than independent measurements alone could provide. It follows that these more accurate estimates of the basic signal parameters lead to more accurate estimates of platform position and attitude and the rates of change of these quantities.

    摘要翻译： 具有耦合跟踪信道的导航接收机旨在用于基于三边测量的无线电导航系统，其中由多个基于地面或基于空间的终端发送的无线电信号的到达时间由用户终端测量并由用户使用 终端计算其位置和方向。 耦合跟踪导航接收机周期性地测量到达接收机的接收端口的所有信号的载波相位，载波频率，调制相位和载波幅度，并周期性地估计载波相位，载波频率和调制相位的当前值， 所有接收的信号，用于每个参数的估计过程通过考虑视线路径的相对几何形状来估计接收到的信号的参数测量结果，以统计适当的方式合适地组合接收信号，接收器时钟时间 动态和动态和运动约束，从而在不良信号接收条件下获得更好的性能，并且对于每个接收信号的载波相位，载波频率和调制相位的精确估计，可以单独提供独立的测量结果。 因此，对基本信号参数的这些更准确的估计导致对平台位置和态度的更准确的估计以及这些量的变化率。

    Navigation system and method
    8.
    发明授权
    Navigation system and method 失效
    导航系统和方法

    公开(公告)号：US4445118A

    公开(公告)日：1984-04-24

    申请号：US266253

    申请日：1981-05-22

    申请人： Ralph E. Taylor ,  James W. Sennott

    发明人： Ralph E. Taylor ,  James W. Sennott

    IPC分类号： G01S1/00 ,  G01S5/00 ,  G01S19/02 ,  H04B7/185

    CPC分类号： G01S19/05 ,  G01S5/0027 ,  G01S5/0036

    摘要： In a global positioning system (GPS), such as the NAVSTAR/GPS system, wherein the position coordinates of user terminals (14) are obtained by processing multiple signals transmitted by a constellation of orbiting satellites (16), an acquisition-aiding signal generated by an earth-based control station (12) is relayed to user terminals via a geostationary satellite (10) to simplify user equipment. The aiding signal is FSK modulated on a reference channel slightly offset from the standard GPS channel. The aiding signal identifies satellites in view having best geometry and includes Doppler prediction data as well as GPS satellite coordinates and identification data associated with user terminals within an area being served by the control station (12) and relay satellite (10). The aiding signal significantly reduces user equipment by simplifying spread spectrum signal demodulation and reducing data processing functions previously carried out at the user terminals (14).

    摘要翻译： 在诸如NAVSTAR / GPS系统的全球定位系统（GPS）中，其中通过处理由轨道卫星（16）的星座发送的多个信号来获得用户终端（14）的位置坐标，生成获取辅助信号 由地球控制站（12）通过对地静止卫星（10）中继到用户终端，以简化用户设备。 辅助信号在与标准GPS通道略微偏移的参考通道上进行FSK调制。 辅助信号识别具有最佳几何形状的卫星，并且包括多普勒预测数据以及与由控制站（12）和中继卫星（10）服务的区域内的用户终端相关联的GPS卫星坐标和识别数据。 辅助信号通过简化扩频信号解调并减少先前在用户终端（14）执行的数据处理功能，大大降低了用户设备。