The invention relates to a network of communicating survey nails (10) that each comprise an active radiofrequency identification beacon, comprising: a stand-alone electrical power source for powering a transmitter and a storage means; the storage means for storing a unique identifier and nail position data; the transmitter of a radiofrequency signal compliant with an RFID protocol comprising said unique identifier and said nail position data, the transmitter comprising an antenna.

The invention also relates to a device (30) for recording topography, which comprises at least three nails (10) and a georeferencing device (36) comprising: a first communication means (361) using an RFID protocol, for receiving the radiofrequency signal comprising the unique identifier and the position data of each nail; and a triangulation means (363) configured to calculate the position of the georeferencing device with respect to the position of the three nails.

Disclosed is a radio-visual approach for device localization. In particular, a mobile device may receive, via radio signal(s) emitted by transmitter(s) in a vehicle that is substantially proximate to the mobile device, radio data that represents vehicle information associated with the vehicle, and may then determine or obtain a location of the vehicle in accordance with that vehicle information. Also, the mobile device may capture an image of the vehicle and may use that image as basis for determining a relative location indicating where the mobile device is located relative to the vehicle. Based on the location of the vehicle and on the relative location of the mobile device, the mobile device may then determine a location of the mobile device.

A system for finding up in a projectile flight relative to earth. The system having a transmitter which transmits polarized reference signals to a guidance sub-system on the projectile. The guidance sub-system includes a magnetometer and polarized and non-polarized receivers. Measurements from the magnetometer are used to determine a general up direction. The polarized and non-polarized receivers are arranged such that, during rotation of the projectile, reference signals received by the polarized receiver modulate whereas reference signals received by the non-polarized receivers are unaffected. A ratio of the strengths of the signals received by the polarized and non-polarized receivers determines alignment of a vertical axis. From the general up direction and alignment of the vertical axis, a precise up direction of the projectile in flight relative to the earth can be determined.

Methods and systems are disclosed for providing location services. Consistent with disclosed embodiments, disclosed systems and methods may include a beacon registering device for providing location services. The beacon registering device may include a non-transitory memory storing instructions. The beacon registering device may also include one or more processors that execute the stored instructions to perform operations comprising: receiving beacon information, the beacon information comprising connection information for a first beacon; updating at least one beacon entry stored in a database based on the received beacon information, the beacon entry including a beacon location, beacon connection information, and beacon metadata; receiving a beacon request from a user device, the beacon request indicating a user location; selecting beacons based on the beacon entry and the beacon request, the selected beacons including at least the first beacon; providing selected beacon information to the user device for registering the first beacon with the user device, the selected beacon information including the connection information for the first beacon.

Provided is a face-to-face situation determination system in which a first beacon, which is a beacon carried by a first user, transmits a first signal including information identifying the first beacon. A second beacon, which is a beacon carried by a second user, upon receiving the first signal from the first beacon, transmits, toward a control device, a second signal including information identifying the first beacon, a first signal reception intensity, and information identifying the second beacon. The control device receives the second signal and, on the basis of the first signal reception strength included in the second signal, determines that the first user and the second user are facing each other if the first signal reception strength is greater than or equal to a first threshold value for a predetermined period or longer, and determines that the first user and the second user are facing one direction.

The disclosure describes a real-time location system for tracking assets at a site. The system includes one or more tracking tags for carrying by or on the assets, one or more locating device nodes and a processing application. Each tracking tag includes a short-range radio frequency signal transmitter configured to transmit a beacon signal with unique identification information of the tracking tag. Each locating device node includes a signal receiver configured to receive the beacon signals at a received signal strength and a long-range radio frequency transmitter configured to transmit, using a spread spectrum, long-range modulation over a wide area network, locating signals including the unique identification information of the tracking tag and a received signal strength indicator representing the received signal strength. The processing application is configured to associate tracking tags and locating device nodes based upon the received signal strength indicator.

Methods and systems are disclosed for providing location services. Consistent with disclosed embodiments, disclosed systems and methods may include a beacon registering device for providing location services. The beacon registering device may include a non-transitory memory storing instructions. The beacon registering device may also include one or more processors that execute the stored instructions to perform operations comprising: receiving beacon information, the beacon information comprising connection information for a first beacon; updating at least one beacon entry stored in a database based on the received beacon information, the beacon entry including a beacon location, beacon connection information, and beacon metadata; receiving a beacon request from a user device, the beacon request indicating a user location; selecting beacons based on the beacon entry and the beacon request, the selected beacons including at least the first beacon; providing selected beacon information to the user device for registering the first beacon with the user device, the selected beacon information including the connection information for the first beacon.

A system for and method of fighting fires using a monitoring system in communication with a hazard mitigation robot. The monitoring system is comprised of a plurality of sensors receiving data that is analyzed by the monitoring system to identify a potential fire. When a potential fire is detected, the monitoring system dispatches one or more autonomous hazard mitigation robots which navigate to an indicated location, confirm the presence of a fire, and attempt to extinguish the fire using fire suppressant material carried onboard the hazard mitigation robot.

A tracker device for a first responder including a radio configured to receive a first radio signal from an emitter, and receive a second radio signal from an unmanned aerial vehicle (UAV). The second radio signal includes at least one data packet including location information associated with the emitter. Processing circuitry in communication with the radio is configured to determine at least one location parameter associated with the emitter based on the first radio signal and the location information of the at least one data packet of the second radio signal.

A method for transmitting a bit sequence to be transmitted at a frequency f.sub.b. A set of codes is determined in advance, wherein each code is associated with a possible value from a block of N.sub.b bits, and each code includes an ordered set of N.sub.s binary symbols intended to be transmitted at a frequency f.sub.s. The method includes splitting the bit sequence into N blocks of N.sub.b bits, the frequency f.sub.s and the numbers N and N.sub.b being selected such that N.sub.s×f.sub.b=N×N.sub.b×f.sub.s, associating a code with each of the N blocks according to the value from the blocks, interleaving the binary symbols of the N codes respectively corresponding to the N blocks of bits to be transmitted, the interleaved binary symbols being transmitted at a frequency f.sub.c such that N×f.sub.s=f.sub.c.