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公开(公告)号：US12207226B2
公开(公告)日：2025-01-21
申请号：US17722721
申请日：2022-04-18
Applicant: NEC Laboratories America, Inc.
Inventor： Ramanujan Sheshadri , Karthikeyan Sundaresan , Md. Shaifur Rahman
IPC: H04W64/00 , G01S5/02 , H04B17/27 , H04B17/318
Abstract: Methods and systems for identifying device positions include measuring radio signal strength information between devices. Inertial information is measured for the devices. The radio signal strength information and the inertial information are fused to determine relative locations between the devices. The relative locations are oriented to a fixed anchor node. Elevation is estimated for the plurality of devices using pressure sensor information.
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公开(公告)号：US11595934B2
公开(公告)日：2023-02-28
申请号：US17214188
申请日：2021-03-26
Applicant: NEC Laboratories America, Inc.
Inventor： Ayon Chakraborty , Karthikeyan Sundaresan , Sampath Rangarajan , Md. Shaifur Rahman
Abstract: Methods and systems for localization within an environment include determining a topology estimate of nodes located in a dynamic indoor environment, based on distances measured between the nodes. Rigid k-core sub-graphs of the topology estimate are generated to determine relative localizations of the nodes. Relative localizations are transformed into absolute localizations to generate a map of positions of the nodes within the environment. A feature of the map is deployed to a device in the environment.
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公开(公告)号：US20220381870A1
公开(公告)日：2022-12-01
申请号：US17825687
申请日：2022-05-26
Applicant: NEC Laboratories America, Inc.
Inventor： Karthikeyan Sundaresan , Ramanujan Sheshadri , Mallesham Dasari
Abstract: Methods and systems for determining a device position include determining a first position estimate using radio-based range information. A second position estimate is determined using visual odometry information. The first position estimate and the second position estimate are fused based on radio environmental conditions and visual environmental conditions to determine a final position estimate. Resources are deployed based on the final position estimate.
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公开(公告)号：US20220338158A1
公开(公告)日：2022-10-20
申请号：US17722721
申请日：2022-04-18
Applicant: NEC Laboratories America, Inc.
Inventor： Ramanujan Sheshadri , Karthikeyan Sundaresan , Md. Shaifur Rahman
IPC: H04W64/00 , G01S5/02 , H04B17/318 , H04B17/27
Abstract: Methods and systems for identifying device positions include measuring radio signal strength information between devices. Inertial information is measured for the devices. The radio signal strength information and the inertial information are fused to determine relative locations between the devices. The relative locations are oriented to a fixed anchor node. Elevation is estimated for the plurality of devices using pressure sensor information.
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公开(公告)号：US11089432B2
公开(公告)日：2021-08-10
申请号：US16568747
申请日：2019-09-12
Applicant: NEC Laboratories America, Inc.
Inventor： Karthikeyan Sundaresan , Ayon Chakraborty , Sampath Rangarajan , Ashutosh Dhekne
Abstract: Systems and methods for localizing and tracking mobile objects are provided. The method includes determining an initial location of a node based on multi-lateration from an unmanned aerial vehicle and determining a velocity vector associated with the node based on multi-lateration. The method also includes detecting when the node turns. An adaptive aperture is applied to address a non-uniform velocity of the node based on the turn and the velocity vector.
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Patent Agency Ranking
公开(公告)号：US20210231792A1
公开(公告)日：2021-07-29
申请号：US17157194
申请日：2021-01-25
Applicant: NEC Laboratories America, Inc.
Inventor： Karthikeyan Sundaresan , Sampath Rangarajan
Abstract: A product locating system is provided. The system includes at least one Radio Frequency (RF) backscatter transmitter configured to emit a main carrier RF signal that forms an excitation signal. The system further includes a passive RF backscatter tag associated with a product and configured to generate an Ultra-Wideband (UWB) signal from the excitation signal. The system also includes at least one RF backscatter receiver configured to simultaneously receive both the excitation signal from the at least one RF backscatter transmitter and the UWB signal from the passive RF backscatter tag, and compute the time-difference-of-arrival (TDoA) therebetween. TDoA information from multiple RF backscatter receivers, including the at least one RF backscatter receiver, is aggregated to compute the location of the product to which the passive RF backscatter tag is attached.
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公开(公告)号：US10852416B2
公开(公告)日：2020-12-01
申请号：US16582416
申请日：2019-09-25
Applicant: NEC Laboratories America, Inc.
Inventor： Karthikeyan Sundaresan , Eugene Chai , Sampath Rangarajan
Abstract: An in-store interaction and location system is provided. At least one RF backscatter transmitter, hosted on a device, is configured to emit a RF signal on a frequency. A set of passive RF backscatter tags, each associated with a respective one of a plurality of products in a given store area, is configured to reflect and frequency shift the RF signal to a different frequency. At least one RF backscatter receiver, hosted on another device, is configured to read the plurality of products on the different frequency by detecting a distributed ambient backscatter signal generated by a reflection and frequency shifting of the RF signal by the passive RF backscatter tag. At least one of the device and the other device is configured to maintain an inventory and a location of the plurality of products in the given store area and provide the inventory and location to a user device.
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公开(公告)号：US10852415B2
公开(公告)日：2020-12-01
申请号：US16582364
申请日：2019-09-25
Applicant: NEC Laboratories America, Inc.
Inventor： Karthikeyan Sundaresan , Eugene Chai , Sampath Rangarajan
Abstract: A navigation assistance system is provided. At least one RF backscatter transmitter, hosted on a device, is configured to emit a RF signal on a frequency. A set of passive RF backscatter tags, each associated with a respective one of a plurality of navigation markers in a given venue, is configured to reflect the RF signal and frequency shift the RF signal to a different frequency. At least one RF backscatter receiver is configured to read the navigation markers on the different frequency by detecting a distributed ambient backscatter signal generated by a reflection and frequency shifting of the RF signal by the passive RF backscatter tag. At least one of the device hosting the at least one RF backscatter transmitter and the other device hosting the at least one RF backscatter receiver is configured to maintain an inventory of locations of the navigation markers in the given venue.
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公开(公告)号：US10852413B2
公开(公告)日：2020-12-01
申请号：US16381294
申请日：2019-04-11
Applicant: NEC Laboratories America, Inc.
Inventor： Karthikeyan Sundaresan , Eugene Chai , Sampath Rangarajan
Abstract: A product tagging system is provided. The product tagging system includes at least one RF backscatter transmitter configured to emit a Radio Frequency (RF) signal on a frequency. The product tagging system further includes a passive RF backscatter tag associated with a product and configured to reflect and frequency shift the RF signal to a different frequency. The product tagging system also includes at least one RF backscatter receiver configured to read the product on the different frequency by detecting a distributed ambient backscatter signal generated by a reflection and frequency shifting of the RF signal by the passive RF backscatter tag.
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公开(公告)号：US20200151532A1
公开(公告)日：2020-05-14
申请号：US16743737
申请日：2020-01-15
Applicant: NEC Laboratories America, Inc.
Inventor： Karthikeyan Sundaresan , Eugene Chai , Sampath Rangarajan , Mohammad Rostami
Abstract: A product tagging system is provided. The product tagging system includes at least one RF backscatter transmitter configured to emit (i) a main carrier RF signal, and (ii) Radio Frequency (RF) signals on two frequencies whose summation forms a twin carrier RF signal. The product tagging system further includes a passive RF backscatter tag associated with a product and configured to reflect and frequency shift the main carrier RF signal to a different frequency using the twin carrier RF signal. The product tagging system also includes at least one RF backscatter receiver configured to read the product on the different frequency by detecting a distributed ambient backscatter signal generated by a reflection and frequency shifting of the main carrier RF signal by the passive RF backscatter tag.
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