公开(公告)号：US09681269B2

公开(公告)日：2017-06-13

申请号：US15209703

申请日：2016-07-13

Applicant: APPLE INC.

Inventor： Glenn D. MacGougan ,  Robert W. Mayor ,  Kumar Chhokra

IPC: H04W4/02 ,  H04W64/00 ,  H04B17/40 ,  H04W4/20 ,  G01S19/28 ,  H04B7/185

CPC classification number: H04W4/025 ,  G01S19/28 ,  H04B7/18519 ,  H04B17/40 ,  H04W4/02 ,  H04W4/023 ,  H04W4/20 ,  H04W64/00

Abstract: A mobile device adjusts the extents to which it depends on various satellites to estimate its global position based on the predicted probability for each such satellite that a ray extending from that satellite to the mobile device is obstructed by a building. The mobile device can predict the probabilities of building obstructions based on a digital model of the environment in which the mobile device is estimated to be. The mobile device weights the extent of uncertainty for each satellite's global positioning data based on the predicted probability of obstruction for that satellite. Using these weighted uncertainties, the mobile device selects the extents to which it relies on each satellite's global positioning data when estimating the mobile device's current global position.

公开(公告)号：US09488964B2

公开(公告)日：2016-11-08

申请号：US14475216

申请日：2014-09-02

Applicant: Apple Inc.

Inventor： Jay N. Bruins ,  Augustin Prats ,  Glenn D. MacGougan

IPC: G04R20/00 ,  G04R20/14 ,  H04W56/00 ,  G04R20/26 ,  G04R20/02 ,  H04L29/06

CPC classification number: G04R20/00 ,  G04R20/02 ,  G04R20/14 ,  G04R20/26 ,  H04L69/28 ,  H04W56/0015

Abstract: Methods for operating portable electronic devices to maintain accurate timing information are provided. In one suitable arrangement, an electronic device may have a real-time clock and a mach-time clock that can be used separately to track the Coordinated Universal Time (UTC). The offset of the real-time clock and the mach-time clock from UTC can be monitored to determine if there is any oscillator frequency drift, which can be characterized using a linear model. Any variation in drift caused by environment factors such as temperature may also be characterized. In another suitable arrangement, a primary electronic device that is capable of maintaining accurate timing information may transfer that information to a secondary user device. Timing information may be transferred using mach-time values and may then be converted to real-time clock values to ensure that the secondary user device can estimate time accurately even when the device goes to sleep.

Abstract translation: 提供了用于操作便携式电子设备以维持准确的定时信息的方法。 在一个合适的布置中，电子设备可以具有可以单独使用的跟踪协调世界时（UTC）的实时时钟和机时时钟。 可以监视实时时钟的偏移量和来自UTC的机械时钟时钟，以确定是否存在振荡器频率漂移，这可以使用线性模型进行表征。 也可以表征由环境因素如温度引起的漂移的任何变化。 在另一种合适的布置中，能够维持准确定时信息的主电子设备可以将该信息传送到次用户设备。 可以使用机械时间值传送定时信息，然后可以将其转换为实时时钟值，以确保辅助用户设备即使在设备进入睡眠时也可准确估计时间。

公开(公告)号：US20160258749A1

公开(公告)日：2016-09-08

申请号：US14639652

申请日：2015-03-05

Applicant: Apple Inc.

Inventor： Glenn D. MacGougan ,  Changlin Ma ,  Robert W. Mayor

IPC: G01C5/06 ,  G01S19/13

CPC classification number: G01C5/06 ,  G01S19/13 ,  G01S19/45

Abstract: An electronic device may include a pressure sensor for measuring barometric pressure. Pressure measurements may be calibrated using crowd-sourced pressure data to remove any weather bias or sensor bias associated with the pressure measurements. Altitude of the electronic device may be determined using the calibrated pressure measurement. When it is desired to estimate altitude, the electronic device may transmit a query to a server, which returns a local reference pressure value for the electronic device based on crowd-sourced pressure data from electronic devices in the vicinity of the electronic device making the query. To determine the local reference pressure value, the server may correlate the crowd-sourced pressure data with space, taking into account variations in terrain using digital elevation models to determine location-specific reference pressures. The local reference pressure value for a given electronic device is then determined using crowd-sourced reference pressures at nearby locations.

Abstract translation: 电子设备可以包括用于测量大气压力的压力传感器。 压力测量可以使用人群来源的压力数据进行校准，以消除与压力测量相关联的任何天气偏差或传感器偏差。 可以使用校准的压力测量来确定电子设备的高度。 当希望估计高度时，电子设备可以向服务器发送查询，该服务器基于来自电子设备附近的来自电子设备的来自人群的压力数据返回电子设备的本地参考压力值，从而进行查询 。 为了确定本地参考压力值，服务器可以将人群来源的压力数据与空间相关联，考虑到使用数字高程模型的地形变化以确定位置特定的参考压力。 然后，使用在附近位置的人群来源的参考压力来确定给定电子设备的局部参考压力值。