An ejectable flight data recorder for robust retention of flight data and aiding in locating an aircraft after an emergency situation comprises: a buoyant housing comprising an internal cavity, a door for access to at least a portion of the internal cavity, and an aerodynamic outer shape having a longitudinal axis; an energy-dissipating nose cone for reducing an impact load on the housing when the flight data recorder impacts a water surface; a nonvolatile memory configured to store flight data; a position sensor for detecting a geographic position of the flight data recorder; a radio transmitter; an antenna electrically coupled to the radio transmitter; a sustainable power system; and a hydrophone for acoustically tracking a sinking trajectory of the aircraft in a body of water.

A system to provide privacy from third party vehicles includes a radio circuit configured to send a privacy indication in a beacon frame; and a movable device including a radio circuit to receive the beacon frame and a motor actuator controlled to comply with the privacy indication.

A trackable camera beacon is provided that is mountable onto a camera, so that the camera can be more easily tracked and automatically controlled. The camera beacon obtains lens data from the lens of a camera, position data corresponding to the camera beacon, and outputs a unified and synchronized data packet. The unified and synchronized output includes position, orientation and lens data. This can be used to also control the camera, such as the focus, iris and zoom parameters of the lens.

Circuits for controlling magnetic-based tracking systems are described. These systems may be used in virtual reality applications, for example to track in real-time the location of one or more body parts. The systems use a beacon emitting mutually orthogonal magnetic fields. On the receiver side, one or more sensors disposed on different parts of a body receive the magnetic fields. The beacon includes switching amplifiers for driving the magnetic field emitters. Being binary, these amplifiers may be controlled by binary signals. The circuits may exhibit a resonant frequency response, and may be operated off-resonance, thus providing for a better control of the magnetic fields amplitude. As a result, however, fluctuations in the envelop of the magnetic fields due to the presence of a beating tone may arise. These fluctuations may be shortened by gradually activating the drivers for the magnetic field emitters.

In one aspect, the present disclosure related to a method for modifying a beacon light source for use in a light-based positioning system. In some embodiments, the method includes selecting a modulation scheme for the light source, determining a duty cycle for the light source based on the modulation scheme, the duty cycle having a proportion of time the light source is in an on state and a corresponding proportion of time the light source is in an off state, the proportion of time the light source is in an off state resulting in reduced luminosity of the light source, and supplying additional power to the light source to compensate for the reduced luminosity of the light source by the duty cycle.

A localization system 100 comprising multiple beacons 120 and an assignment system 110 is provided. The assignment system is arranged to assign a temporary location identifier to a location identifier associated with a beacon. A scheduler 150 is arranged to schedule the assigning of temporary location identifiers according to a schedule. It is avoided that the beacons have a fixed location identifier, thus third parties cannot create a mapping between the temporary location identifiers and the locations of the beacons.

Methods, apparatus, systems, and devices are described for using a mobile device equipped with an image sensor to retrieve information associated with a light fixture. A method of using a mobile device equipped with an image sensor to retrieve information associated with a light fixture may include capturing, at the image sensor, an image of an illuminated indicia. The illuminated indicia may be co-located with the light fixture. At least one characteristic of the illuminated indicia may be determined from the image of the illuminated indicia. Information associated with the at least one characteristic of the illuminated indicia may be retrieved.

Methods, apparatus, systems, and devices are described for using a mobile device equipped with an image sensor to retrieve information associated with a light fixture. A method of using a mobile device equipped with an image sensor to retrieve information associated with a light fixture may include capturing, at the image sensor, an image of an illuminated indicia. The illuminated indicia may be co-located with the light fixture. At least one characteristic of the illuminated indicia may be determined from the image of the illuminated indicia. Information associated with the at least one characteristic of the illuminated indicia may be retrieved.

A method of indoor positioning using Fine Timing Measurement (FTM) avoiding co-located access point (AP) is proposed. In a wireless local area network, an AP obtains neighboring AP location information and determines a list of co-located BSSIDs. In a first option, an STA first selects an AP and query for AP location and co-located BSSID information using ANQP (Access Network Query Protocol). In a second option, the STA first selects an AP and initiates FTM protocol with the selected AP and thereby obtaining AP location and co-located BSSID information. Upon obtaining the AP location and the co-located BSSID list, the STA can initiates FTM protocol with additional non-co-located BSSs for determining an accurate STA location.

An air sterilizing apparatus is created which can be set within an environment without adversely affecting people, pets, or plants within the environment such as a room. The apparatus uses a passage through which ambient air passes. The passage has a treatment chamber in which ultraviolet light (ideally UV-C) is used to sterile the ambient air. Each end section of the passage is configured to block light from exiting the passage. In the preferred embodiment, each end section includes a coating of UV adsorbing material to provide further protection to the environment from the UV light.