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公开(公告)号：US20170195006A1
公开(公告)日：2017-07-06
申请号：US15462338
申请日：2017-03-17
申请人： NextNav, LLC
CPC分类号： H04B1/709 , G01S1/042 , G01S5/145 , G01S19/02 , G01S19/10 , G01S19/46 , H04B1/711 , H04W4/025
摘要： Systems and methods for improving performance in terrestrial and satellite positioning systems. Signal processing systems and methods are described for selecting, from among a set of codes, certain codes having desired autocorrelation and/or cross-correlation properties. Systems and methods for generating, encoding, transmitting, and receiving signals using the selected codes are also described.
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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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3.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：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：US20170299692A1
公开(公告)日：2017-10-19
申请号：US15637574
申请日：2017-06-29
申请人： NextNav, LLC
发明人： NORMAN F. KRASNER
CPC分类号： G01S7/023 , G01S5/0215 , G01S19/21 , H03H17/025 , H04B1/7101 , H04B1/7107 , H04K3/90
摘要： An interference removal filter that includes a combination of a first filter and a second filter, where the first filter passes signals over a frequency range of size B with a variation of less than +/−3 dB, where the peak value of the impulse response of the second filter is displaced in time from the peak value of the impulse response of the first filter by at least 2/B time units, and where the combination of the first filter and the second filter produces a notch in frequency at a frequency location within the frequency range.
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