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公开(公告)号：US20180007655A1
公开(公告)日：2018-01-04
申请号：US15706051
申请日：2017-09-15
申请人： NextNav, LLC
发明人： ARUN RAGHUPATHY , NORMAN F. KRASNER
摘要： Embodiments describe determining position by selecting a set of digital pseudorandom sequences. The magnitudes of the cross-correlation between any two sequences of the chosen set are below a specified threshold. A subset of digital pseudorandom sequences are selected from the set such that the magnitudes of the autocorrelation function of each member of the subset, within a specified region adjacent to the peak of the autocorrelation function, are equal to or less than a prescribed value. Each transmitter transmits a positioning signal, and at least a portion of the positioning signal is modulated with at least one member of the subset. At least two transmitters of the plurality of transmitters modulate respective positioning signals with different members of the subset of digital pseudorandom sequences.
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公开(公告)号：US20180003794A1
公开(公告)日：2018-01-04
申请号：US15706076
申请日：2017-09-15
申请人： NextNav, LLC
CPC分类号： G01S5/0226 , G01S1/042 , G01S19/11 , G01S19/46 , H04W64/00
摘要： Devices, systems, and methods for sending positional information from transmitters/beacons. In one implementation a transmitter generates a range block including a ranging signal and a hybrid block including positioning data, and sends the range block and hybrid block at different times. A user device may receive signals from a plurality of transmitters and generates position/location information using trilateration and measured altitude information in comparison with transmitter altitude information.
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公开(公告)号：US20170250986A1
公开(公告)日：2017-08-31
申请号：US15439764
申请日：2017-02-22
申请人： NextNav, LLC
CPC分类号： H04W12/06 , G06F1/3206 , G06F21/44 , G06F21/629 , G06F2221/2103 , H04L63/0442 , H04L63/08 , H04L63/102 , H04W4/029 , H04W4/90 , H04W12/08
摘要： Controlling access to position information. Control of access to position information may be provided by exchanging authenticating messages that restrict distribution of the position information to authorized recipients. Alternatively, control of access may be provided by limiting when hardware that determines position information is active.
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4.发明申请CELL ORGANIZATION AND TRANSMISSION SCHEMES IN A WIDE AREA POSITIONING SYSTEM (WAPS) 有权宽域定位系统（WAPS）中的小区组织和传输方案公开(公告)号：US20160259062A1
公开(公告)日：2016-09-08
申请号：US15157288
申请日：2016-05-17
申请人： NextNav, LLC
发明人： ARUN RAGHUPATHY , NORMAN F. KRASNER
摘要： A position location system comprises transmitters that broadcast positioning signals. Each broadcasted positioning signal comprises a pseudorandom ranging signal. The position location system includes a remote receiver that acquires and measures the time of arrival of the positioning signals received at the remote receiver. During an interval of time, at least two positioning signals are transmitted concurrently by the transmitters and received concurrently at the remote receiver. The two positioning signals have carrier frequencies offset from one another by an offset that is less than approximately twenty-five percent of the bandwidth of each positioning signal of the two positioning signals. Cross-interference between the positioning signals is reduced by tuning the remote receiver to a frequency of a selected signal of the two positioning signals and correlating the selected signal with a reference pseudorandom ranging signal matched to a transmitted pseudorandom ranging signal of the selected signal.
摘要翻译： 位置定位系统包括广播定位信号的发射机。 每个广播的定位信号包括伪随机测距信号。 位置定位系统包括远程接收器，其获取并测量在远程接收器处接收的定位信号的到达时间。 在时间间隔期间，至少两个定位信号由发射机同时发送并且在远程接收机处并发地接收。 两个定位信号的载波频率彼此偏移小于两个定位信号的每个定位信号的带宽的大约百分之二十五的偏移。 通过将远程接收机调谐到两个定位信号的所选信号的频率，并将所选择的信号与所选择的信号的发射的伪随机测距信号匹配的参考伪随机测距信号相关联，来减少定位信号之间的交叉干扰。
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公开(公告)号：US20210006951A1
公开(公告)日：2021-01-07
申请号：US15930289
申请日：2020-05-12
申请人： NextNav, LLC
摘要： Using a pressure sensor of a mobile device to improve the reliability of determined contexts. Particular embodiments described herein include machines that determine a context of a mobile device, and determine if the determined context is accurate using one or more measurements of pressure from a pressure sensor of the mobile device.
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公开(公告)号：US20190141635A1
公开(公告)日：2019-05-09
申请号：US16220873
申请日：2018-12-14
申请人： NextNav, LLC
IPC分类号： H04W52/02 , G01S5/10 , H04B17/373 , G01S5/02
CPC分类号： H04W52/0245 , G01S5/0221 , G01S5/0236 , G01S5/10 , G01S5/14 , H04B7/2643 , H04B17/318 , H04B17/373 , H04W52/0254 , Y02D70/142 , Y02D70/144 , Y02D70/164 , Y02D70/449
摘要： Reducing power consumption of a receiver in association with estimating the receiver's position using ranging signals. Systems and methods may determine power reduction strategy information, identify a power reduction strategy using the determined power reduction strategy information, and place one or more modules of the receiver into a reduced power state using the identified power reduction strategy. The power reduction strategy may result in powering off different circuitry of the receiver at different times, and under different circumstances.
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公开(公告)号：US20170311264A1
公开(公告)日：2017-10-26
申请号：US15487219
申请日：2017-04-13
申请人： NextNav, LLC
IPC分类号： H04W52/02 , G01S5/10 , G01S5/02 , H04B17/373 , H04B7/26 , H04B17/318
CPC分类号： H04W52/0245 , G01S5/0221 , G01S5/10 , H04B7/2643 , H04B17/318 , H04B17/373 , H04W52/0254 , Y02D70/142 , Y02D70/144 , Y02D70/164 , Y02D70/449
摘要： Reducing power consumption of a receiver in association with estimating the receiver's position using ranging signals. Systems and methods may determine power reduction strategy information, identify a power reduction strategy using the determined power reduction strategy information, and place one or more modules of the receiver into a reduced power state using the identified power reduction strategy. The power reduction strategy may result in powering off different circuitry of the receiver at different times, and under different circumstances.
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公开(公告)号：US20170250841A1
公开(公告)日：2017-08-31
申请号：US15288556
申请日：2016-10-07
申请人： NextNav, LLC
IPC分类号： H04L25/08 , H04B17/336 , H04L5/00
CPC分类号： G01S5/0215 , G01S5/0252 , G01S5/145 , G01S19/21 , H04B17/318 , H04B17/336 , H04B17/345 , H04L5/006 , H04L25/08 , H04W52/243 , H04W52/283
摘要： Interference detection and mitigation using maximal ratio combining in the correlation domain. Systems and methods for interference detection and mitigation using maximal ratio combining in the correlation domain may receive a plurality of copies of a positioning signal, compute a plurality of correlation functions using the received positioning signals; weight the plurality of correlation functions using a plurality of weights that are proportional to the quality of the plurality of correlation functions, and generate a combined correlation function by combining the weighted correlation functions.
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公开(公告)号：US20170094471A1
公开(公告)日：2017-03-30
申请号：US15276486
申请日：2016-09-26
申请人： NextNav, LLC
摘要： Using estimates of a receiver's altitude to determine where a receiver is located and to refine a positioning system's estimate of a receiver's position. Systems and methods determine whether a receiver is inside or outside a building, and may use the determination to confirm or adjust an initial estimate of the receiver's position. Various approaches for making the determination and for assessing the initial estimate of the receiver's position are described.
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公开(公告)号：US20210055800A1
公开(公告)日：2021-02-25
申请号：US15930304
申请日：2020-05-12
申请人： NextNav, LLC
摘要： Determining contexts of mobile devices. Particular embodiments described herein include machines that determine two estimated positions of a mobile device that respectively correspond to first and second locations at first and second times, acquire sets of terrain or structural information for first and second areas that respectively include the first and second estimated positions, use the acquired sets of information and the estimated positions to determine if the mobile device was within a structure at the first and second times, determine one or more values that are indicative of vertical movement by the mobile device during a period of time between the first time and the second time, compare the one or more values to one or more threshold conditions, and determine a context of the mobile device based on the comparison.
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