Systems and methods for improving an estimate of receiver altitude by mitigating the effects of transmitter heating

    公开(公告)号:US10598486B2

    公开(公告)日:2020-03-24

    申请号:US16372638

    申请日:2019-04-02

    Applicant: NextNav, LLC

    Abstract: Improving an estimated altitude of a receiver by mitigating the effects of transmitter heating. Systems and methods for improving estimates of a receiver's altitude determine a reference pressure at a reference altitude using a temperature measured at a transmitter or another temperature value, an altitude of the transmitter, and a pressure measured by the transmitter or another pressure value. A local reference pressure for a receiver is determined using the reference pressure and other reference pressures from other transmitters. Reference pressures from overheating transmitters may be weighted less than reference pressures from other transmitters when determining the local reference pressure. The local reference pressure is then used to estimate the altitude of the receiver.

    Systems and methods for improved accuracy in determining altitude from pressure

    公开(公告)号:US09829313B2

    公开(公告)日:2017-11-28

    申请号:US14618137

    申请日:2015-02-10

    Applicant: NextNav, LLC

    Inventor: Thomas Wolf

    CPC classification number: G01C5/06 G01K13/00 G01N19/10

    Abstract: Described are methods, systems, means and machine-readable media embodying program instructions for considering water molecules and other mixtures in air when estimating an altitude of a pressure sensor. In at least one implementation, a measurement of humidity is used to compute a gas constant value, and the computed gas constant value is used to estimate an altitude of a pressure sensor. In another embodiment, the measurement of humidity is compared to a threshold condition related to humidity. Depending on the results of the comparison, the measurement of humidity is used to determine the altitude of the pressure sensor.

    Wide area positioning system
    5.
    发明授权
    Wide area positioning system 有权
    广域定位系统

    公开(公告)号:US08874398B2

    公开(公告)日:2014-10-28

    申请号:US14029682

    申请日:2013-09-17

    Applicant: NextNav, LLC

    Abstract: Systems and methods for estimating a height of a mobile device are described. A reference pressure estimate is generated using atmospheric data from one or more reference locations. Various approaches for determining the reference pressure estimate are described. The reference pressure estimate is used, along with a pressure measurement at a position of a mobile device, to estimate the height of the mobile device.

    Abstract translation: 描述用于估计移动设备的高度的系统和方法。 使用来自一个或多个参考位置的大气数据产生参考压力估计。 描述用于确定参考压力估计的各种方法。 使用参考压力估计以及在移动设备的位置处的压力测量来估计移动设备的高度。

    WIDE AREA POSITIONING SYSTEM
    9.
    发明申请
    WIDE AREA POSITIONING SYSTEM 有权
    宽域定位系统

    公开(公告)号:US20150226854A1

    公开(公告)日:2015-08-13

    申请号:US14696457

    申请日:2015-04-26

    Applicant: NextNav, LLC

    Abstract: Positioning systems and methods for estimating an altitude of a receiver. In some embodiments, pressure and temperature information from a network of sensors is received by the receiver, and the pressure and temperature information from the network of sensors is used along with pressure information measured at a position of the receiver to estimate the altitude of the receiver.

    Abstract translation: 用于估计接收机高度的定位系统和方法。 在一些实施例中,来自传感器网络的压力和温度信息由接收器接收,并且来自传感器网络的压力和温度信息与在接收器的位置处测量的压力信息一起使用以估计接收器的高度 。

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