The system and method of attitude determination by pulse beacon and extremely low cost inertial measuring unit. A pulse beacon is used to generate a plurality of pulses detected by a detector or receiver located on the rear of a projectile such that direction of arrival can be determined. A synchronized clock proved for velocity and range information. Altitude can also be determined and may use an altimeter or the like. The use of a low cost IMU is possible with internal calibration by the system. Real-time attitude information provides for correction for crosswind and other drift enabling the system to have less down range dispersion.

The system and method of attitude determination by pulse beacon and extremely low cost inertial measuring unit. A pulse beacon is used to generate a plurality of pulses detected by a detector or receiver located on the rear of a projectile such that direction of arrival can be determined. A synchronized clock proved for velocity and range information. Altitude can also be determined and may use an altimeter or the like. The use of a low cost IMU is possible with internal calibration by the system. Real-time attitude information provides for correction for crosswind and other drift enabling the system to have less down range dispersion.

A multimode tracking device includes a line of site (LOS) antenna; an LOS modem for communicating with other multimode tracking devices and for measuring power of a received signal; a satellite antenna; a satellite modem for communicating with a satellite for receiving and sending text messages, data and commands to and from external devices including a tracking and locating system; a Bluetooth or WiFi Direct interface for communicating with external mobile devices; an inertia measurement unit for providing motion tracking information; a user interface for interfacing with a user; and a processor for generating and displaying a line of bearing to the target on the display, based on the measured power and the motion tracking information. The multimode tracking device tracks assets and personnel and sends/receives text messages, data and commands to/from external devices both over the horizon via the satellite and locally via the LOS modem.

A multimode tracking device includes a line of site (LOS) antenna; an LOS modem for communicating with other multimode tracking devices and for measuring power of a received signal; a satellite antenna; a satellite modem for communicating with a satellite for receiving and sending text messages, data and commands to and from external devices including a tracking and locating system; a Bluetooth or WiFi Direct interface for communicating with external mobile devices; an inertia measurement unit for providing motion tracking information; a user interface for interfacing with a user; and a processor for generating and displaying a line of bearing to the target on the display, based on the measured power and the motion tracking information. The multimode tracking device tracks assets and personnel and sends/receives text messages, data and commands to/from external devices both over the horizon via the satellite and locally via the LOS modem.

A method for protection against a relay attack on a system is composed of at least a first and a second communication device. Data are transmitted wirelessly between the first and the second communication device. The first communication device ascertains a first spectrum of all wirelessly transmitted signals to be received at the location of the first communication device within a frequency band. The second communication device likewise ascertains a second spectrum of all wirelessly transmitted signals to be received at the location of the second communication device within the frequency band. The frequency band is limited by a minimum and a maximum frequency. The second communication device transmits the second spectrum to the first communication device. The first communication device compares the first spectrum with the second spectrum in order to ascertain whether the second communication device is located at the location of the first communication device.

A directional receiver system may include a receiver, a plurality of receive antenna elements, and a circuit. The receiver may include an input port and an output. The plurality of receive antenna elements may be fixedly configured into a known geometric relationship to each other, and each of the receive antenna elements may be connected to the input port of the receiver. The circuit may be coupled to the output of the receiver, configured to determine time differences at which signals from a source are incident upon the antenna elements, and configured to determine an angular orientation of the source to the receive antenna elements based on the time differences.

Some embodiments of the current invention relate to finding and identifying a transmitter. In some embodiments, two antennas are separated by an offset, and/or receive a single signal. Optionally, a processor determines a direction to the transmitter of the signal. For example, the determination may be based on a phase difference between the response of the two antennas. Optionally, the device further includes an identification module that may determine an identification associated with the transmitter. For example, the system may be used to find a particular object or person and/or to differentiate between a friend and a foe.

An emitter positioning method based on spectrum monitoring big data processing comprises the following steps: station monitoring data obtaining, multi-station spectrum monitoring data-based emitter direction finding, multi-station spectrum monitoring data-based emitter cross positioning, and emitter continuous positioning.

An emitter positioning method based on spectrum monitoring big data processing comprises the following steps: station monitoring data obtaining, multi-station spectrum monitoring data-based emitter direction finding, multi-station spectrum monitoring data-based emitter cross positioning, and emitter continuous positioning.

A wave construction method is described that can be used to generate a new and different wave front, which is not parallel to the natural expanding wave front from the emitted signal generated from the source array. Restated, a wave construction method is described that can be used to generate a new and different wave front which is not perpendicular to the direction from the source array to the center of the wave front. This method can also be used to shape a wave in the far field or near field, by changing the locations of the computed points, and generating a linear or non-linear shaped wave (front). This disclosure allows for the controlling, rotating, or shaping radio frequency or acoustic waves in free space or in a fluid.