Abstract: Systems and methods for providing a shared augmented reality environment are provided. In particular, the latency of communication is reduced by using a peer-to-peer protocol to determine where to send datagrams. Datagrams describe actions that occur within the shared augmented reality environment, and the processing of datagrams is split between an intermediary node of a communications network (e.g., a cell tower) and a server. As a result, the intermediary node may provide updates to a local state of a client device when a datagram is labelled peer-to-peer, and otherwise provides updates to the master state on the server. This may reduce the latency of communication and allow users of the location-based parallel reality game to see actions occur more quickly in the shared augmented reality environment.

Abstract: A dataflow hierarchy protocol is implemented by one or more devices to optimize how the one or more devices process datagrams for network communications. The dataflow hierarchy considers various available network pathways for dataflow. A device implementing the dataflow hierarchy selects one or more of the available network pathways to provide low latency in data communication with other devices. The device may sample various available network pathways to determine pathway metrics (e.g., latency) and select one or more network pathways based on the metrics. The available network pathways can include pathways through one or more intermediary nodes, such as pathways through a game server, pathways through a cell tower, and pathways through a network.

Abstract: A system and method determine the location of a device. The device collects sensor data using one or more sensors. Based on the sensor data, one or more localization models are selected from a plurality of localization models. The selected models are applied to generate one or more candidate locations. The current location of the device is determined based on the one or more candidate locations.

Abstract: Devices for determining a state of a magnetic field-generating article are provided. In various embodiments, a device comprises: a single crystal diamond having a plurality of NV centers, the single crystal diamond configured to be disposed adjacent to a magnetic field-generating article, and configured to generate a fluorescent signal in response to being illuminated by a light source; a coherent light source configured to generate a light beam directed at the single crystal diamond; a microwave (MW) radiation source configured to irradiate the single crystal diamond with a MW signal; a magnetic field source configured to apply a bias magnetic field to the single crystal diamond; a photosensor configured to collect the fluorescent signal generated by the single crystal diamond; and a computing node operatively coupled to each of the coherent light source, the MW radiation source, the magnetic field source, and the photosensor.

Abstract: Processing of actions within a shared augmented reality experience is split between an edge node of a communications network (e.g., a cell tower) and a server. As a result, computation of the current state may be sharded naturally based on real-world location, with state updates generally provided by the edge node and the server providing conflict resolution based on a master state (e.g., where actions connected to different edge nodes potentially interfere with each other). In this way, latency may be reduced as game actions are communicated between clients connected to the same edge node using a peer-to-peer (P2P) protocol without routing the actions via the game server.

Abstract: A dataflow hierarchy protocol is implemented by one or more devices to optimize how the one or more devices process datagrams for network communications. The dataflow hierarchy considers various available network pathways for dataflow. A device implementing the dataflow hierarchy selects one or more of the available network pathways to provide low latency in data communication with other devices. The device may sample various available network pathways to determine pathway metrics (e.g., latency) and select one or more network pathways based on the metrics. The available network pathways can include pathways through one or more intermediary nodes, such as pathways through a game server, pathways through a cell tower, and pathways through a network.

Abstract: An improved network architecture for minimizing latency of preparing and sending data to a network over a physical medium. A system for communicating messages over a network may create and store ready-to-send data packets in a data buffer next to or as close as possible, either physically and/or logically, to a MAC component. The MAC component may then receive the data packet directly from the data buffer and encapsulate the data packet into a frame suitable for transmission to the network. The data packet is modifiable while being stored in the data buffer prior to transmission to the network.

Abstract: Processing of actions within a shared augmented reality experience is split between an edge node of a communications network (e.g., a cell tower) and a server. As a result, computation of the current state may be sharded naturally based on real-world location, with state updates generally provided by the edge node and the server providing conflict resolution based on a master state (e.g., where actions connected to different edge nodes potentially interfere with each other). In this way, latency may be reduced as game actions are communicated between clients connected to the same edge node using a peer-to-peer (P2P) protocol without routing the actions via the game server.

Abstract: An improved network architecture for minimizing latency of preparing and sending data to a network over a physical medium. A system for communicating messages over a network may create and store ready-to-send data packets in a data buffer next to or as close as possible, either physically and/or logically, to a MAC component. The MAC component may then receive the data packet directly from the data buffer and encapsulate the data packet into a frame suitable for transmission to the network. The data packet is modifiable while being stored in the data buffer prior to transmission to the network.

Abstract: Aspects of the present invention relate to a control system (2) for monitoring a movement of a trailer (3) connected to a vehicle (1). The control system comprises one or more controllers (5) and is configured to: receive image data from an image sensor (10) disposed on the vehicle; store image data corresponding to a central reference image, a current reference image and a current frame and associate an offset angle with the current reference image, and associate a correction angle with current reference image. The control system (2) is configured to compare the current reference image to the current frame to determine a change angle; determine a hitch angle in dependence on the offset angle, the change angle and the correction angle; and output the hitch angle.

Abstract: A controller for an electromechanical transducer is provided. The controller comprises driving means operable to actuate a mechanical output of the transducer; impedance cancelling means operable to at least partially cancel an electrical impedance of the transducer; and linearising means between an input of the controller and the driving means. The linearising means are operable to generate an output signal by modifying an input signal of the linearising means to compensate for nonlinear behaviour of the transducer. The linearising means are operable to receive one or more state signals indicative of one or more state variables of the transducer, the one or more state signals comprising a velocity signal indicative of a velocity of the mechanical output of the transducer.

Abstract: An aircraft fuel system includes a fuel cell adapted to contain fuel. A fuel cell receiving assembly has an inner surface adapted to receive the fuel cell. A shaped foam substrate is machined from a foam substrate to fit between the inner surface of the fuel cell receiving assembly and the fuel cell. A polyurea spray coating substantially covers the shaped foam substrate to form a fuel cell cushion. The polyurea spray coating is sprayable onto the shaped foam substrate such that the fuel cell cushion is substantially nonabsorbent of fuel. The fuel cell cushion is interposable between the inner surface of the fuel cell receiving assembly and the fuel cell to cushion the fuel cell from damage.

Abstract: A method and system of measuring a direct current magnetic field using a plurality of spin centers are disclosed. A spin bath associated with the spin centers may be driven with a first source of electromagnetic radiation to reduce dephasing of the spin centers. The spin centers may be measured using double quantum (DQ) magnetometry in order to reduce the effects of crystal strain on spin dephasing times. An electromagnetic response of at least one of the plurality of spin centers may be observed using an electromagnetic radiation collection device. Accordingly, up to an eight times improvement in DC field sensitivity may be accomplished for a spin center ensemble.

Abstract: Devices for determining a state of a magnetic field-generating article are provided. In various embodiments, a device comprises: a single crystal diamond having a plurality of NV centers, the single crystal diamond configured to be disposed adjacent to a magnetic field-generating article, and configured to generate a fluorescent signal in response to being illuminated by a light source; a coherent light source configured to generate a light beam directed at the single crystal diamond; a microwave (MW) radiation source configured to irradiate the single crystal diamond with a MW signal; a magnetic field source configured to apply a bias magnetic field to the single crystal diamond; a photosensor configured to collect the fluorescent signal generated by the single crystal diamond; and a computing node operatively coupled to each of the coherent light source, the MW radiation source, the magnetic field source, and the photosensor.

Abstract: A system enables an arbitrary number of items to be indexed in a geographic region that provides a predictable query response time across a sharded database. Items indexed to the geographic region are stored on a single shard and additional items are added to that shard as long as an overflow condition indicative of undesirable query response times is not met. If the overflow condition is met the system expands the storage of items indexed to the geographic region to one or more additional shards in order to maintain predictable query response times. The system may maintain a shard count representing the total number of shards being used to store items corresponding to a geographic region, which can be used to query one or more relevant shards. The system may apply deterministic hashing in order to evenly distribute shards across database nodes of the sharded database.

Abstract: An augmented reality system generates computer-mediated reality on a client device. The client device has sensors including a camera configured to capture image data of an environment. The augmented reality system generates a first 3D map of the environment around the client device based on captured image data. The server receives image data captured from a second client device in the environment and generates a second 3D map of the environment. The server links the first and second 3D together in a singular 3D map. The singular 3D map may be a graphical representation of the real world using nodes that represent 3D maps generated by image data captured at client devices and edges that represent transformations between the nodes.

Abstract: A dataflow hierarchy protocol is implemented by one or more devices to optimize how the one or more devices process datagrams for network communications. The dataflow hierarchy considers various available network pathways for dataflow. A device implementing the dataflow hierarchy selects one or more of the available network pathways to provide low latency in data communication with other devices. The device may sample various available network pathways to determine pathway metrics (e.g., latency) and select one or more network pathways based on the metrics. The available network pathways can include pathways through one or more intermediary nodes, such as pathways through a game server, pathways through a cell tower, and pathways through a network.

Abstract: A manhole device and corresponding system including a manhole is described. The manhole device comprises a main body having an upper portion, a lower portion and a securing means. The securing means is engageable with the manhole such that when secured to the manhole, the upper portion protrudes above a surface level and the lower portion is retained below the surface level in the manhole. The main body provides means for alignment for construction around the manhole while providing a barrier to prevent access to vehicles, people and debris during the construction process. A method of construction is also provided.

Abstract: A system and method determine the location of a device. The device collects sensor data using one or more sensors. Based on the sensor data, one or more localization models are selected from a plurality of localization models. The selected models are applied to generate one or more candidate locations. The current location of the device is determined based on the one or more candidate locations.

Abstract: A method and system of improving T2* times for magnetic sensing using spin center ensembles is disclosed. The spin bath associated with the spin centers may be driven with a first source of electromagnetic radiation to reduce dephasing of the spin centers. The spin centers may be measured using double quantum (DQ) magnetometry in order to reduce the effects of crystal strain on T2*. Accordingly, up to an 8× improvement in DC field sensitivity may be accomplished for a spin center ensemble.