The invention is directed to a UAV, system, and method for radio frequency spectral analysis. Accordingly, an unmanned aerial vehicle (UAV) having a flight body, a flight module, a geolocation module, and a signal detection module is utilized to detect and store signal data associated with various radio signal(s) during flight. The signal data may then be displayed on a processing device to provide a user with a visualization of the signal data parameters in various points of three dimensional space and at particular recorded times.

The invention is directed to a UAV, system, and method for radio frequency spectral analysis. Accordingly, an unmanned aerial vehicle (UAV) having a flight body, a flight module, a geolocation module, and a signal detection module is utilized to detect and store signal data associated with various radio signal(s) during flight. The signal data may then be displayed on a processing device to provide a user with a visualization of the signal data parameters in various points of three dimensional space and at particular recorded times.

A split architecture is disclosed for determining the location of a wireless device in a heterogeneous wireless communications environment. A detector within the device or another component of the environment receives signals including parameters for a localization signal of the device. The parameters describe known in advance signals within the signals. Additional metadata including each frame start of the signals and assistance data and auxiliary information are also received. The known in advance signals are detected based on the parameters of the localization signal. Samples extracted from the known in advance signals are then processed and compressed and sent with other collect data to a locate server remote from the detector. The location server uses that information as well as similar information about the environment to calculate the location of the device, as well as perform tracking and navigation of the device, and report such results to the environment.

A communication network of the present disclosure can determine one or more locations of communication devices within its geographic coverage area based upon one or more communication signals that are communicated within the communication network and/or between the communication network and another communication network. The one or more communication devices within the communication network can be implemented to utilize, for example, pilot signals encoded using orthogonal frequency-division multiplexing (OFDM) on multiple carrier frequencies to concurrently transmit the one or more communication signals over multiple signal pathways. The communication devices can determine one or more characteristics of these various communication signals that are received over the multiple signal pathways to assist in determining the one or more locations. Thereafter, the communication devices can determine one or more properties from the one or more characteristics to determine the one or more locations.

An apparatus for radio direction finding, the apparatus comprising: a receiver configured to receive target signals to be subjected to the direction finding of signal sources, which are acquired by an antenna array; a channel profiler configured to produce profiles of the target signals received through the receiver; a pre-analyzer configured to preemptively process in a narrowband the wideband target signals based on the profiles that are produced by the channel profiler to produce pre-analyzed information for the wideband target signals; and a direction finder configured to perform the direction finding on the signal sources using the pre-analyzed information and the profilers of the target signals.

An apparatus for radio direction finding, the apparatus comprising: a receiver configured to receive target signals to be subjected to the direction finding of signal sources, which are acquired by an antenna array; a channel profiler configured to produce profiles of the target signals received through the receiver; a pre-analyzer configured to preemptively process in a narrowband the wideband target signals based on the profiles that are produced by the channel profiler to produce pre-analyzed information for the wideband target signals; and a direction finder configured to perform the direction finding on the signal sources using the pre-analyzed information and the profilers of the target signals.

An identification method comprising: when an object is in a whole process from entering to separating from a region inducted by the low-frequency electromagnetic field, receiving the low-frequency signal of the low-frequency electromagnetic field in real time; extracting the attribute code and signal intensity corresponding to the low-frequency signal received and conducting associate storage; and after the object separates from the region inducted by the low-frequency electromagnetic field, determining the route direction along which the object passes through the vector beacons according to the attribute code and signal intensity stored.

Disclosed is a method for direction-of-arrival estimation based on sparse reconstruction in the presence of gain-phase error, which comprises the following steps: firstly, estimating a noise power and an gain error from an array received signal by adopting a characteristic decomposition method; then, based on a compensated covariance matrix, transforming a direction-of-arrival estimation problem into a non-convex optimization problem in a sparse frame by a method of sparse reconstruction; finally, estimating a grid angle and a deviation angle by using an alternate optimization method. This estimation method can effectively eliminate the influence of a phase error in direction-of-arrival estimation, and has better adaptability, which improves the resolution and estimation accuracy of the algorithm.

A method and apparatus for determining the position of a RFID tag. The method includes the following: (1) measuring the position of an active device to an accuracy of better than 1.0 meter using a radio locating system to determine the position of a reference point; (2) detecting a first RF signal from a reference RFID tag near the reference point with an RF receiver in an RFID reading system; (3) detecting a second RF signal from a RFID tag of interest with the RF receiver in the RFID reading system; and (4) processing both the first RF signal and the second RF signal and relying upon at least partially the position of the reference point to determine the position of the RFID tag of interest.

Techniques for identifying an orientation for an antenna in a wireless communication device. A plurality of estimates of antenna gain are determined for an antenna associated with a wireless access point (AP), the plurality of estimates of antenna gain relating to a plurality of wireless stations (STAs) associated with the AP. An orientation for the antenna is determined based on the plurality of estimates of antenna gain and a plurality of properties for the antenna.