Abstract: A method of navigating a mobile platform. A reflectable electronic signal is transmitted. A reflection of the reflectable signal is received. A position of the mobile platform is determined based upon the reflection of the reflectable signal. A platform position signal is transmitted to the mobile platform. The platform position signal provides the mobile platform the determined position of the mobile platform. The mobile platform is navigated based upon the platform position signal.

Abstract: A device for transmitting a satellite positioning signal received by an external antenna to an unexposed receiver having an internal receiving antenna.

Abstract: The invention relates to a method and an arrangement for performing triggering and for determining a triggering moment. In the solution, a unipolar electrical pulse of a detector (106, 118) is converted between the detector (106, 118) and a first amplifier (108, 120) succeeding the detector into at least one bipolar electrical oscillation. The bipolar electrical oscillation is amplified with at least one amplifier (108, 120) and triggering is performed at a zero level between the extreme values of the bipolar electrical oscillation. In addition, a triggering moment is determined, at which the amplified bipolar electrical oscillation crosses the zero level between its extreme values.

Abstract: A method for tracking motion using an audio compass is disclosed. The method comprises receiving motion sensor data indicating seismic activity recorded by at least two seismic sensors, and converting the received motion sensor data into audio signals for interpretation at an audio compass. The method uses the audio compass to determine a current distance to the seismic activity based on an interpreted signal intensity of the audio signals. The method further uses the audio compass to identify a current position of the audio compass relative to the seismic activity.

Abstract: A method and system for detecting and locating RF weapons being used against aircraft. Large geographic regions may be defended by equipping a constellation of high-altitude airborne platforms with RF detectors, GPS receivers and a communications unit. The communications unit downlinks data indicating an RF weapon pulse and associated time and location data. From this data, a ground station performs a time difference of arrival (TDOA) location fix of the RF weapon.

Abstract: The invention relates to sensors of the speed of movement of a vehicle over the ground. The sensor comprises illumination means for illuminating the surface and at least one optical sensor able to detect the radiation returned by the surface. The illumination means and the optical sensor have one and the same optical axis, oblique in relation to the surface. This arrangement eliminates the risks of specular reflection dazzling the sensor while avoiding disturbance of the measurement by variations in the height of the sensor relative to the ground.

Abstract: A method for searching satellites includes obtaining a position information, obtaining a time information, calculating a regional range according to the position information, finding out numbers of target satellites corresponding to the time information and within the regional range from ephemeris data in an ephemeris database, searching the target satellites corresponding to the numbers, and receiving the satellite signals from each searched target satellite. In an electronic device capable of searching satellites, an operation interface is used to output the position information, and a calculation unit is used to calculate the regional range according to the received position information. A look-up unit is electrically connected to the ephemeris database, and used to find out the numbers of the target satellites corresponding to time information and within the regional range from the ephemeris data.

Abstract: A system includes first and second transmitters attachable to first and second vehicles. The transmitters can each transmit successive signals at predetermined time intervals. Tracking stations at different locations are configured to receive the signals transmitted by at least one of the first and second transmitters, distinguish signals transmitted by the first transmitter from signals transmitted by the second transmitter, and determine from the transmitted signals respective position information for at least one of the first and second transmitters. Each of the tracking stations is further configured to be in signal communication with at least one other of the tracking stations. The system further includes at least one processing device in signal communication with at least one of the tracking stations. The processing device is configured to determine from the position information a location of the first vehicle relative to a location of the second vehicle.

Abstract: In a system for determining the angle of arrival of a target signal received by an array of antenna elements, a receiver obtains observations of a received target signal from an array of antenna elements; and a computer processes the obtained observations of the target signal with estimates of a target signal for different angles of arrival of a target signal received by the array of antenna elements to determine that the angle of arrival of the target signal is an angle of arrival at which dissimilarity between the observations of target signal and the estimates of the target signal for the different angles of arrival is minimized.

Abstract: In order to provide a radio wave absorber that can be produced easily and has excellent radio wave absorption characteristics, a conductive surface 2 of a conductive paint 6 is formed on one surface 1a of a mat-shaped inorganic fiber bulk material 1.

Abstract: A method and apparatus for determining the location of a device from signals provided by a plurality of satellites. A device receives a first plurality of signals comprising one signal from each of a first plurality of satellites and determines a first location of the device as a function of the first plurality of signals. The device then determines a second location thereof as a function of a second plurality of signals if the first location is not within a predetermined threshold. The second plurality of signals is a first subset of the first plurality of signals.

Abstract: A method for detecting radar signal comprises the steps of: sampling a received signal so as to obtain a plurality of sampling values; taking an absolute value of the sampling values so as to obtain at least two parameters; and determining whether the received signal includes radar signals in accordance with the at least two parameters.

Abstract: The invention relates to a method for increasing the accuracy of a measurement of a radio-based locating system comprising a mobile station and at least one fixed station, wherein the movement of a mobile station from an initial position is detected by way of measuring data of an absolute sensor system and a relative sensor system, a virtual antenna is embodied in the form of synthetic aperture by way of measuring data and the mobile station is focused on the fixed station and/or vice versa by using the synthetic aperture.

Abstract: A correction calculation method for a satellite based positioning system with a network of receiving units as reference stations comprises a partitioning of the network into groups of reference stations, calculation of group-specific correction factors, amalgamation of the group-specific correction factors and subsequently, derivation of network-specific correction parameters. In this partitioning, the reference stations are represented by nodes in a connected, edge-weighted graph, in the generation of which an edge respectively connecting two nodes is only generated if it satisfies a distance-dependent connectivity condition, whereby the distance between the nodes connected by this edge is input into the weighting function of this edge. From the graph a minimum spanning tree is derived and subsequently partitioned for establishing the groups.

Abstract: A high frequency signal calibration target deployable in outer space includes an expandable and electrically conductive symmetric structure. The structure may mechanically expand from a stowed configuration to a deployed configuration. Scatter of high frequency signal off of a substantially symmetric signal calibration target may be measured to accurately calibrate systems using high frequency signals.

Abstract: A measurement system 1 for measuring a distance to an object to be measured, includes: a half mirror 10; a measurement light emitting unit 11; a projection unit 12; a light-receiving unit 13; a distance calculation unit 14; and a diffusion lens 16.

Abstract: A position estimating device (4) which estimates the position of an object by comparing a receiving pattern obtained from ID transmitters (2a, 2b, . . . ) and ID receivers (3a, 3b, . . . ) installed in an environment with a prestored receiving pattern. Position of an object equipped with no extra device can be estimated only with the ID transmitters and ID receivers installed in an environment even in an indoor multipath environment by utilizing a fact that a receiving pattern obtained from ID transmitters (2a, 2b, . . . ) and ID receivers (3a, 3b, . . . ) installed in an environment changes depending on the position of the object.

Abstract: Methods and apparatus for processing data from a low beam channel, a high beam channel and a weather channel to perform an altitude estimation based upon a target amplitude ratio between the low beam channel and the high beam channel and target range, and for performing target detection based upon data from the weather channel. In one embodiment, migrating birds can be more accurately detected and classified than with conventional systems.

Abstract: The present invention relates to an array antenna arrangement comprising at least two antenna sub-arrays and at least one antenna element in each antenna sub-array. The array antenna arrangement is adapted for calculation of a total covariance matrix (R) of a received signal vector (x). The array antenna arrangement further comprises at least one switch, where the number of switches corresponds to the number of antenna elements in each antenna sub-array. Each switch is connected to a respective radio chain, and is arranged to connect the antenna elements of a respective corresponding antenna sub-array to the respective radio chain cyclically. At least one full switch cycle, comprising a set of received signals for each switch configuration, is carried out for a calculation of the total covariance matrix (R). The present invention also relates to a corresponding method.

Abstract: A method for recording a position of at least one component in a location system of a control system of an industrial facility for an industrial process. A model of the facility is created, including position coordinates for major parts of the facility. The model is stored in a location system storage. A component is identified. A mobile information processing device is placed adjacent the component and position coordinates are detected for the mobile information processing device. Identification information of the component and position coordinates of the mobile information processing device are stored in the location system storage.