Locix, Inc.

Silicon Laboratories Inc.

Zainar, Inc.

Silicon Labs Sc, Inc.

Manu Seth

Tommi Ylamurto

Lingkai Kong

Vivek Subramanian

Teymur Bakhishev

Mark Bilstad

Emmanuel Philippe Quevy

Mir Bahram Ghaderi

Richard Steven Miller

David L Brubaker

Andrew D McCraith

Aaron J Caffee

Sourav Raj Dey

Yunteng Huang

Brian G Drost

Mehrnaz Motiee

Colin Weltin-Wu

Demba Ba

In one embodiment, an asynchronous wireless system for localization of nodes comprises a first wireless node being configured to receive a first communication from a third wireless node having an unknown location, to determine time difference of arrival (TDoA) information of the reception of the first communication between each of the first and a second wireless node, to determine TDoA ranging including a relative or absolute position of the third wireless node using the time difference of arrival information, and to synchronize the first and second wireless nodes based on a second communication with the synchronization being decoupled in time from the first communication. In another embodiment, a computer implemented method comprises receiving, with first and second wireless anchor nodes, packets from a wireless arbitrary device and performing time difference of arrival ranging upon reception of the packets between each of the first and the second wireless anchor nodes.

Systems and methods for precise radio frequency localization of wireless nodes using time difference of arrival and decoupling in time synchronizing of the wireless nodes from ranging

Systems and methods for precise radio frequency localization of wireless nodes including a wireless arbitrary device using time difference of arrival

Systems and methods for determining locations of wireless nodes in a network architecture are disclosed herein. In one example, an asynchronous system includes a first wireless node having a wireless device with one or more processing units and RF circuitry for transmitting and receiving communications in the wireless network architecture including a first RF signal having a first packet. The system also includes a second wireless node having a wireless device with a transmitter and a receiver to enable bi-directional communications with the first wireless node in the wireless network architecture including a second RF signal with a second packet. The first wireless node determines a time of flight estimate for localization based on a time estimate of round trip time of the first and second packets and a time estimate that is based on channel sense information of the first and second wireless nodes.

Systems and methods for precise radio frequency localization in the presence of multiple communication paths

Systems, apparatuses, and methods for determining locations of wireless nodes in a network architecture are disclosed herein. In one example, a system includes a first wireless node having a wireless device with one or more processing units and RF circuitry for transmitting and receiving communications in the wireless network architecture including a first RF signal having a first packet. A second wireless node having a wireless device with a transmitter and a receiver enables bi-directional communications with the first wireless node in the wireless network architecture including a second RF signal with a second packet. The one or more processing units of the first wireless node are configured to execute instructions to determine a round trip time estimate of the first and second packets, to determine channel state information (CSI) of the first and second wireless nodes, and to calibrate hardware to determine hardware delays of the first and second wireless nodes.

Systems and methods for determining locations of wireless sensor nodes based on radio frequency communications between the nodes and various RF-enabled devices

Systems, apparatuses, and methods for determining locations of wireless nodes in a network architecture are disclosed herein. In one example, a system for localization of nodes in a wireless network architecture, comprises a wireless node having a wireless device with one or more processing units and RF circuitry for transmitting and receiving communications in the wireless network architecture; and a plurality of wireless sensor nodes having a wireless device with a transmitter and a receiver to enable bi-directional communications with the wireless node in the wireless network architecture. One or more processing units of the wireless node are configured to execute instructions to determine ranging data including a set of possible ranges between the wireless node and the plurality of wireless sensor nodes having unknown locations, and to associate a set of relative locations within an environment of the wireless network architecture with the wireless node and the plurality of wireless sensor nodes.

Systems and methods for determining locations of wireless sensor nodes based on anchorless nodes and known environment information

Systems and methods for determining locations of wireless nodes in a network architecture are disclosed herein. In one example, a method comprises initiating calibration, with processing logic, of at least one component of RF circuitry having a transmit chain and a receive chain of a first wireless node by generating a first loopback calibration signal and passing this first loopback calibration signal through the transmit chain and the receive chain of the first wireless node. The method further includes measuring a first transmit time delay for passing the first loopback calibration signal through the transmit chain and also measuring a first receive time delay for passing the first loopback calibration signal through the receive chain of the first wireless node.

Systems and methods for coarse and fine time of flight estimates for precise radio frequency localization in the presence of multiple communication paths

Systems, apparatuses, and methods for determining locations of wireless nodes in a network architecture are disclosed herein. In one example, a system for localization of nodes in a wireless network architecture comprises a plurality of wireless anchor nodes each having a known location and a wireless device with one or more processing units and RF circuitry for transmitting and receiving communications in the wireless network architecture and a wireless node having a wireless device with a transmitter and a receiver to enable bi-directional communications with the plurality of wireless anchor nodes in the wireless network architecture. One or more processing units of at least one of the plurality of wireless anchor nodes are configured to execute instructions to determine a set of possible ranges between each anchor node and the wireless node having an unknown location and to perform a triangulation algorithm that utilizes a maximum likelihood estimation (MLE) of ranging measurements from anchor nodes.

Systems and methods for using ranging and triangulation to determine locations of wireless sensor nodes based on radio frequency communications between the nodes and various RF-enabled devices

Systems and apparatuses for determining locations of wireless nodes in a network architecture are disclosed herein. In one example, an asynchronous system includes first and second wireless nodes each having a wireless device with one or more processing units and RF circuitry for transmitting and receiving communications in the wireless network architecture. The system also includes a third wireless node having an unknown location and a wireless device with a transmitter and a receiver to enable communications with the first and second wireless nodes in the wireless network architecture. The one or more processing units of the first wireless node are configured to transmit instructions to a cloud based entity or execute instructions to determine a location coordinate hypothesis and a transmit time hypothesis for a transmitted communication of the third wireless node, determine an error function associated with the transmit time hypothesis for each received path j of the receiving first and second wireless nodes at the location coordinate hypothesis, and determine a probability function of the error function for each received path j of the first and second wireless nodes using statistical properties of path measurement accuracy.

Systems and methods for precise radio frequency localization using time sweep time difference of arrival

Systems and methods for adaptively determining locations of wireless nodes in a network architecture are disclosed herein. In one example, a system includes a first plurality of wireless sensor nodes each having a known location and a second plurality of wireless sensor nodes each having an unknown location in a wireless network architecture. One or more processing units of a wireless sensor node of the first plurality of wireless nodes are configured to execute instructions to determine distance estimates between the first plurality of wireless sensor nodes and the second plurality of wireless sensor nodes for localization, determine error metric information for each distance estimate, and adaptively select the determined distance estimates for localization based on the error metric information.

Systems and methods for adaptively selecting distance estimates for localization of nodes based on error metric information

Systems and apparatuses for determining locations of wireless nodes in a network architecture are disclosed herein. In one example, an asynchronous system includes first and second wireless nodes each having a wireless device with one or more processing units and RF circuitry for transmitting and receiving communications in the wireless network architecture. The system also includes a wireless node having an unknown location and a wireless device with a transmitter and a receiver to enable communications with the first and second third wireless nodes in the wireless network architecture. The first wireless node transmits a communication to the second wireless node and the wireless node having an unknown location, receives a communication with an acknowledge packet from the wireless node, and determines time difference of arrival information between the first and second wireless nodes.

Systems and methods for precise radio frequency localization using time difference of arrival

Systems, apparatuses, and methods for determining locations of wireless nodes in a network architecture are disclosed herein. In one example, a system for localization of nodes in a wireless network architecture comprises a plurality of wireless anchor nodes each having a known location and a wireless device with one or more processing units and RF circuitry for transmitting and receiving communications in the wireless network architecture and a wireless node having a wireless device with a transmitter and a receiver to enable bi-directional communications with the plurality of wireless anchor nodes in the wireless network architecture. One or more processing units of at least one of the plurality of wireless anchor nodes are configured to execute instructions to determine a set of possible ranges between each anchor node and the wireless node having an unknown location and to perform a triangulation algorithm that iterates through possible locations of the wireless node to minimize error.

Systems and methods for using ranging to determine locations of wireless sensor nodes based on radio frequency communications between the nodes and various RF-enabled devices

Growing community of inventors

Berkeley, CA, United States of America

Manu Seth