Abstract: A communications device for separating source signals provided by M signal sources includes an antenna array comprising N antenna elements for receiving at least N different summations of the M source signals. A respective in-phase and quadrature module is connected downstream to each antenna element for separating each one of the N different summations of the M source signals received thereby into an in-phase and quadrature component set. A blind signal separation processor forms a mixing matrix comprising at least 2N different summations of the M source signals, with each in-phase and quadrature component set providing 2 inputs into the mixing matrix. The mixing matrix has a rank equal up to 2N. The desired source signals are separated from the mixing matrix by the blind signal separation processor.

Abstract: A radio equipment 1000 separates a signal of a specific terminal from signals from adaptive array antennas #1 to #4, based on a reception weight vector calculated by a reception weight vector calculator 20. Reception coefficient vector calculator 22 provides an impulse response of a signal propagation path of the specific terminal. A transmission coefficient vector estimator 32 predicts a propagation path at the time of transmission, from the result of estimation by the reception coefficient vector calculator 22. The transmission weight vector calculator 30 controls, based on the result of prediction by the transmission coefficient vector estimator 32, the antenna directivity at the time of transmission. Thus, degradation of error rate of the down link generated by the time difference between up/down links can be suppressed.

Abstract: The invention concerns a method of determining the position or change in position or state of motion of a receiver or receivers, the position or change in position or state of motion of which is or are not already known, in a network of transmission sources some or all of whose positions are known. At a first time, the relative offsets in time, phase, frequency, or derivatives thereof with respect to each other, or with respect to a reference source, of the signals received by a first receiver from a plurality of the transmission sources are measured. At a selected second time, the respective offsets of the signals received by the same or a second receiver, whose position or state of motion is not already known, from the plurality of the transmission sources are measured.

Abstract: An electromagnetic wave radiation control apparatus includes an antenna, a modulator, an amplifier, and a radiation control unit. The modulator modulates a carrier wave based on a transmission signal to output a modulated signal, wherein the modulator stops the output of the modulated signal in response to a power off command. The amplifier amplifies the modulated signal such that the amplified signal is radiated as electromagnetic wave from the antenna, when the modulated signal is outputted from the modulator. The radiation control unit generates the power off command to the modulator, when radiation of electromagnetic wave in a current radiation direction of the antenna is inhibited, or when a level of a reception signal by the antenna is equal to or lower than a predetermined minimum level.

Abstract: Method for calibrating the deviation of a received beam in a terminal from its desired position. The received beam reaches a receiving sensor, and an acquisition beam an acquisition sensor of the terminal. The detection range of the acquisition sensor is greater than that of the receiving sensor. A portion of a transmitted beam emitted by the terminal to the partner terminal is guided as an incident beam on the reflecting surface, where it is reflected as an outgoing beam. A portion of the outgoing beam is respectively brought to the acquisition sensor and the receiving sensor. A respective measurement for the acquisition sensor and the receiving sensor is performed at least approximately isochronously; the measured results are compared for determining the deviation of the received beam from its desired position. Also a device for calibrating the deviation of a received beam in a terminal from its desired position.

Abstract: A device for distance measurement using a semiconductor laser in the visible wavelength range, which functions according to the echo time method, includes a collimation objective for bundling the transmitted measuring beam bundle, a circuit arrangement for modulating the measuring beam, a receiving objective for receiving and imaging the measuring beam bundle reflected at the distant object onto a receiving device, and an evaluation device for determining and displaying the distance measured to the object. The circuit arrangement for modulating the measuring beam and the evaluation device can be switched between two different operating modes. In the first operating mode, the modulation takes place using a first frequency and in the second operating mode using a second frequency. These frequencies stand in a whole-member ratio to each other.

Abstract: The navigational system, device and method of the present invention provide navigational information to the user derived from data signals received from a plurality of transmitters (20,22,24,26). The range to each of the plurality of transmitters (20,22,24,26) is then computed based upon the corresponding data signal received from the transmitters, and a current position relative to each of said plurality of transmitters is then determined. Geographical data relating to at least the current location of the user module 32 is stored in a memory 40, and selected geographical data relating to the current location of the user module 32 is retrieved from the memory 40 to provide an audio or video display 44.

Abstract: A photonically controlled antenna element made of a material such as silicon is disclosed wherein one or more of such antenna elements are mounted in an array on a light waveguide made of glass or sapphire. Light is injected into the light waveguide and reflects therein until it is absorbed by the antenna elements due to the higher refractive index of silicon which makes the reflection break down, and thus allows the laser beam to leak out of the waveguide into the silicon antenna elements. When the photonically controlled antenna elements are illuminated they are switched to a conductive state and can transmit and receive electromagnetic signals. When no light is injected into the light waveguide the photonically controlled antenna elements are not illuminated and are in a non-conductive state wherein they cannot receive or transmit electromagnetic signals. A number of these light waveguides with their antenna arrays thereon may be stacked together to form a single antenna system.

Abstract: A friend or foe detection system and method is disclosed. Friend or foe warning unit 20 has a geographic locating system, a communication system for communicating with each of the warning units, and a military force detection system for detecting military forces in a combat area and has a signal routing and control circuitry 50 for controlling operations. A number of components, devices, or sub-systems, such as a transmitter/receiver radio 28, an antenna 26, a microphone 30, a speaker 32, a battery 34, a display 36, a microprocessor 38, a memory 40, a camera 56, a radar/lidar input 54, on/off switch 52, a GPS location system 45 that includes a GPS processor 46, a GPS receiver 42, a GPS antenna 44, are coupled to the circuitry 50. Display 36 provides a display to the user of the unit 20 and shows the location of friendly forces as well as unfriendly or unidentified forces in the area. Display 36 displays text messages for the user of the warning unit 20.

Abstract: The position, velocity, time (PVT) and attitude (ATT) measurement system including a Master GPS antenna and a plurality of Slave GPS antennas is disclosed. The system comprises a hardware PVT channel and a hardware ATT channel. After the Master GPS antenna is selected, the hardware PVT channel stays locked on the Master antenna during the measurement time thus optimizing the accuracy of the PVT data. The PVT channel performs the tracking of the visible GPS satellites and generates the tracking data and the PVT data. The ATT channel performs the attitude measurement using all Slave antennas and the PVT tracking data.

Abstract: The present invention provides a method for determining antenna pointing error of a satellite antenna (702-716) that produces at least one spot beam having a corresponding gain pattern. The method obtains from a first unique location (510) on the ground a first measurement of a spot beam strength for a first cell (502). Similar measurements are obtained at second and third unique locations (512, 514). Attitude component errors, for example the roll or pitch attitude component errors may then be determined. The method may further determine a yaw attitude component error based on fourth, fifth, and sixth measurements of spot beam strength made from unique locations (616-620) in a second cell (604) also generated by the antenna. Additional measurements may be collected in each beam at unique locations (510-514, 516-520, 610-614, 616-620) and averaged to reduce the temporary or zero means effects of rain, scintillation, or other atmospheric conditions on the spot beam strength.

Abstract: A circuit for storing GPS data gathered in the field is described. The stored data is later used to test the ability of GPS processing circuits to handle GPS data containing multipath interference and dropouts.

Abstract: This invention consists of a method for measuring the direction and magnitude of the semi-major and semi-minor axes (13, 14) of the electric ellipse (5) of an incoming wave in a magnetized plasma from the in-phase and quadrature measurements (12) of the electric field that is measured on three orthogonal antennas (1, 2, 3), in order to measure the line-of-sight of the direction of wave propagation (15), and the wave propagation mode (16, 17), from the orientation and rotation sense of the measured wave electric ellipse. In addition, for a wave that consists of a linear combination of the ordinary and extraordinary modes in a magnetized plasma, these measurements can also be used to measure the line-of-sight of the direction of wave propagation (20), and the Faraday rotation angle (21), from the orientation of the semi-major axes of the electric ellipse (17, 18) that are measured at two or more adjacent frequencies.

Abstract: The real time differential satellite navigational system integrated with the tilt measurement system is disclosed. The integrated positioning system allows one to perform the real time precise navigation of a mobile unit in a variable tilt environment. In another embodiment, the map generating system is disclosed. The map generating system utilizes the low cost post-processing differential GPS receiver. The map generating system allows one to record the map of an actual area covered by a mobile unit in a variable tilt environment.