Abstract: An observation device 1 includes a transmitter and receiver (a transmitter 11, a transmission/reception switch 12, an antenna 13, and a receiver 14) that emits a predetermined radar wave to outside the observation device, and that receives the radar wave scattered by an object existing outside the observation device and acquires a received signal, a temporary image generator 15 that generates a temporary image from the received signal acquired by the transmitter and receiver, and a data transmitter 17 that transmits the temporary image generated by the temporary image generator 15 to a data processing device 2. The data processing device 2 includes a data receiver 21 that receives the temporary image transmitted by the data transmitter 17, and an image generator 24 that generates an image from both the temporary image received by the data receiver 21 and orbit data about a moving object.

Abstract: A transmission signal generator produces N transmission pulses for every transmission period from N (N: an integer of 2 or more) kinds of transmission code sequences and (N×M) (M: an integer of 2 or more) kinds of orthogonal code sequences, the transmission pulses being obtained by multiplying transmission codes of the N kinds of transmission code sequences, with selected N orthogonal codes of the (N×M) kinds of orthogonal code sequences. In one transmission period, a radio transmitter converts the N transmission pulses to high-frequency signals, and transmits the signals through a transmission antenna. The (N×M) kinds of orthogonal code sequences are code sequences which satisfy a predetermined mathematical expression in M transmission periods.

Abstract: The various technologies presented herein relate to the determination of whether a received signal comprising radar clutter further comprises a communication signal. The communication signal can comprise of a preamble, a data symbol, communication data, etc. A first portion of the radar clutter is analyzed to determine a radar signature of the first portion of the radar clutter. A second portion of the radar clutter can be extracted based on the radar signature of the first portion. Following extraction, any residual signal can be analyzed to retrieve preamble data, etc. The received signal can be based upon a linear frequency modulation (e.g., a chirp modulation) whereby the chirp frequency can be determined and the frequency of transmission of the communication signal can be based accordingly thereon. The duration and/or bandwidth of the communication signal can be a portion of the duration and/or the bandwidth of the radar clutter.

Abstract: A method for determining the integrity risk at an alert limit of a position solution determined with a satellite navigation system involves calculating a first integrity risk at the alert limit assuming that one satellite j of the satellites is faulty. A first position solution is determined with the signals from all of the satellites and a second position solution is determined with the signals from all of the satellites except for the signal received from the satellite j. A difference between the first and the second position solution is identified and subtracted from the alert limit to create a reduced alert limit. A second integrity risk at the reduced alert limit is calculated with the signals received from all satellites except the signal received from the satellite j. The integrity risk at the alert limit is determined using the minimum of the first and second integrity risks.

Abstract: The differential ultra-wideband indoor positioning method provides differential positioning to increase the accuracy of ultra-wideband (UWB) based indoor position estimation. Knowledge about common errors can be learned by employment of a reference source, where the difference between its known and estimated position (differential operation in solution domain), or the difference between the known and measured ranges (differential operation in measurement domain), provides invaluable information to be utilized in reducing errors in estimating the position of the target source. Differential operation accuracy reaches far beyond the accuracy of the non-differential setting.

Abstract: A system for autonomously mapping and tracking of ground targets at a location of interest has been disclosed. The system comprises at least one user control center in operative communication with one or more data relay satellites in Geostationary Equatorial Orbit (GEO), the data relay satellites in operative communication with one or more UAVs and/or SAR satellites with on-board different imaging sensors to obtain various types of imagery data from the ground targets. The data relay satellites target specific constant communication with the user control center and the UAVs and SAR satellites for continuous feedback and control. Moreover, the system process all raw data obtained from the UAVs and SAR satellites to produce 2D and 3D Digital Elevation Models (DEMs) and high resolution images, which are displayed on the user control center and/or selected mobile handheld devices.

Abstract: In accordance with one aspect of the present technology, information about multipath in an area is gained by occasionally switching the directivity of one or more of the involved antennas (transmitting or receiving). Based on resulting changes in signal strength, information about the multipath effects can be discerned, and corresponding action may thereafter be taken. Another aspect of the technology involves localizing sources of multipath by reference to multiple receiving stations, such as cellular receivers at cell towers in adjoining cells of a wireless network.

Abstract: A radar device including an up-chirp tracking filter that performs a tracking process using a beat frequency at the time of an up-chirp to acquire a beat frequency, a down-chirp tracking filter that performs a tracking process using a beat frequency at the time of a down-chirp to acquire a beat frequency, target detectors that calculate distance and speed estimated values of the target for the chirps from beat frequency time series data about the chirps; an identical target determinator that determines whether or not the target detected for each of the chirps is an identical target using the distance and speed estimated values, and a distance and speed calculator that calculates a distance and a speed of the target using the beat frequency of the target which is determined to be an identical target.

Abstract: A moving ground penetrating radar is comprised of multiple transmitters and receivers with multiple, e.g., Horizontal and Vertical, polarizations to detect buried targets with standoff capability. Novel signal and imaging techniques are used to form high quality radar imagery with low artifacts that are due to various sources of self-induced resonances, e.g., transmitter-receiver coupling, calibration errors, and motion errors in the multi transmitter/receiver channels of the radar system. The irradiated target area image is formed via exploiting both the spatial diversity of the physical multi-transmitter and multi-receiver array and synthetic aperture/array that is generated by the motion of the platform that carries the radar system. The images that are formed from the multiple polarizations are combined to remove surface targets/clutter and, thus, enhance signatures of buried targets.

Abstract: An electromagnetic wave absorber contains cement and carbon nanotubes and has an absolute value of a complex relative permittivity in a range of from 2.0 to 10.0 in a frequency range of from 1 to 110 GHz and a minimum value of a dissipation factor of 0.35 or greater in the frequency range of from 1 to 110 GHz.