A method of determining the location of a mobile computing device includes measuring a first time of flight (ToF) value and a first value of received energy of direct path (EDP) (P.sub.R) of a number of acknowledgement (ACK) packets received in response to a number of first probe packets sent to a first mobile device. The method calculates a preliminary distance value (d.sub.0) using a ToF-based distance equation, selects an ACK packet with a distance closest to d.sub.0 from the number of ACK packets, calculates an initial path loss exponent (.sub.0) of the selected ACK packet sample using d.sub.0 and P.sub.R. With the access point, the method also includes measuring a second P.sub.R for a second number of ACK packets received in response to a number of second probe packets sent to the first mobile device, calculates a supplemental distance value using an EDP-based distance equation and the .sub.0, and determines the location of the mobile device using multilateration and the supplemental distance value.

The present invention discloses a system for identification of emission sources. The system has at least four stations, one being main station. The system operates in 0-6 frequency bands. Each station contains an antenna-feeder system, a multichannel radio receiving path, a control, analysis and signal processing system and a power supply system. The antenna-feeder system comprises a solid metal sheet paraboloid-shaped mirror, a 0 frequency band antenna, compensatory antennas in each of the frequency bands. The system also contains an identification friend or foe and a tactical air navigation (TACAN) systems' signals antenna and a GNSS signals antenna. The radio receiving path provides signals amplification for all bands, converting signals to intermediate frequency. Also the system provides means for timestamping received signals.

The present invention discloses a system for identification of emission sources. The system has at least four stations, one being main station. The system operates in 0-6 frequency bands. Each station contains an antenna-feeder system, a multichannel radio receiving path, a control, analysis and signal processing system and a power supply system. The antenna-feeder system comprises a solid metal sheet paraboloid-shaped mirror, a 0 frequency band antenna, compensatory antennas in each of the frequency bands. The system also contains an identification friend or foe and a tactical air navigation (TACAN) systems' signals antenna and a GNSS signals antenna. The radio receiving path provides signals amplification for all bands, converting signals to intermediate frequency. Also the system provides means for timestamping received signals.

Systems and methods for detecting, localizing, and filtering signals such as radiofrequency signals using an array of antennas are disclosed. Input signals each containing a signal of interested are received, along with a reference signal sharing one or more characteristics of the signal-of-interest. Predetermined time delays and frequency shifts are applied to the input signals such that the signal-of-interest components of the signals are synchronized and to cancel any Doppler-shifting between the signal-of-interest components. A filtering process is employed to filter the shifted input signals and sum them such that a metric indicating the degree of difference between the reference signal and the summed filtered signals (such as the mean squared error, for example) is minimized.

The invention comprises a system of using small, hidden, machine-to-machine (M2M) chips to track automobiles through the radio emissions of the chips, and to use M2M chips as a defense against theft generally, by tracking potentially stolen items through the radio emissions of M2M chips. Users can monitor potential theft of the different parts of an automobile because the chips embedded into the automobile components will be constantly communicating with each other. Spacecraft and other near-earth objects, and drones, can also be tracked by M2M chips, that can be designed in a manner that makes them extremely difficult to find. The M2M chips can be designed in numerous different shapes, and use very little power. Some of the M2M chips are silicon wafer chips with small logic gates.

A rotating element is mounted in a base body for rotation about an axis of rotation. An excitation circuit generates an excitation signal. A divider circuit divides the excitation signal into a base signal supplied to an evaluation circuit and into an outgoing signal supplied to a transceiving antenna. A waveguide circulates in an annular manner about the axis of rotation. The rotating element comprises a termination element protruding into the waveguide and has a reflective side. The transceiving antenna emits an electromagnetic signal into the waveguide propagating in two directions which is reflected from the reflective side and returned to and received by the transceiving antenna which generates in response a receiving signal supplied to the evaluation circuit which determines a position of rotation of the rotating element in relation to a reference position of rotation by evaluating the base signal and receiving signal in a resolution region.

A terminal capable of communicating with a communication apparatus is provided. The terminal comprises a specifying unit to specify a first distance between the terminal and a first unit in the communication apparatus, and a second distance between the terminal and a second unit in the communication apparatus; and a display control unit to cause a display unit to display a first message which relates to the first unit in preference to a second message relating to the second unit in a case where the first distance is shorter than the second distance in a situation of preparing the communication apparatus, and display the second message in preference to the first message in a case where the second distance is shorter than the first distance in the situation of preparing the communication apparatus.

An information handling system operating a diverse wireless location determination system, comprising receiving an instruction to determine a location of an endpoint information handling system having a plurality of network interface device modules supporting a plurality of wireless network protocols, a processor executing instructions to aggregate data including detected time of flight (TOF) signal distance and signal quality values relating to signals exchanged between the endpoint information handling system and a plurality of diverse wireless protocol access points, the processor to determine at least three diverse wireless protocol access point signals meet a signal quality threshold, where at least two of the diverse wireless protocol access points operate under different wireless protocols, and the processor conducting weighted multiangulation or multilateration utilizing the detected TOF signal distances of the exchanged signals based on the detected signal quality category and type of wireless protocol for the exchanged signal.

An information handling system operating a diverse wireless location determination system, comprising receiving an instruction to determine a location of an endpoint information handling system having a plurality of network interface device modules supporting a plurality of wireless network protocols, a processor executing instructions to aggregate data including detected time of flight (TOF) signal distance and signal quality values relating to signals exchanged between the endpoint information handling system and a plurality of diverse wireless protocol access points, the processor to determine at least three diverse wireless protocol access point signals meet a signal quality threshold, where at least two of the diverse wireless protocol access points operate under different wireless protocols, and the processor conducting weighted multiangulation or multilateration utilizing the detected TOF signal distances of the exchanged signals based on the detected signal quality category and type of wireless protocol for the exchanged signal.

Disclosed, among other things is a wide area direction finding system comprising multiple radio frequency (RF) receiving units and a display computer. The RF receiving units may be in different geographic areas to make use of triangulation to precisely locate a target, allowing for increased area coverage and accuracy when locating a target. Locating a target may draw from real-time information using a live mode, or from a past event using a history mode on the display computer.