Abstract: A monopulse tracker includes multiple dual-axis monopulse antenna systems that are angled with respect to one another. The orientations of the monopulse antenna systems create a much larger field of view for the monopulse tracker to eliminate the need to steer the monopulse tracker. The monopulse tracker can be configured to estimate a position of an object based on tracking information received from more than one monopulse antenna system therefore increasing the accuracy of the estimated position. The multiple monopulse antenna systems can be arranged in a low-profile housing to facilitate use of the monopulse tracker on aircraft.

Abstract: A system for measuring the position of an asset is provided. The system includes a first plurality of global positioning system (GPS) sensors arranged on a first asset, and a reference position source arranged on the first asset. One or more computer processors is provided in communication with a memory and is configured to measure position data associated with the first asset from the outputs of the first plurality of GPS sensors, and calculate a measurement offset between the measured position data associated with the first asset and position data obtained from the reference position source. From these measurements, position data measurements obtained from the plurality of GPS sensors of the first asset may be corrected using the calculated measurement offset. Likewise, position data measurements obtained from a plurality of GPS sensors of a second asset, located remotely from the first asset, are also corrected using the calculated measurement offset.

Abstract: A vehicle cooperative object positioning optimization method includes steps of: receiving an information package by the local vehicle and the information package having a vehicle original coordinate and at least one object original coordinate provided by a neighbor vehicle; performing a time delay compensation for the vehicle original coordinate and the object original coordinate to acquire a vehicle coordinate and an object coordinate of the neighbor vehicle respectively; performing an optimizing procedure to optimize the vehicle coordinate and the object coordinate respectively so as to obtain the vehicle optimized coordinate and the object optimized coordinate. Therefore, the vehicle optimized coordinate and the object optimized coordinate possess higher accuracy than the original coordinate information detected by the GPS receiver and other sensors. And that helps to determine a distribution of the environmental objects with improved precision and to enhance driving safety.

Abstract: An improved two-way tagging tracking and locating system uses time of arrival (TOA), Doppler, and angle of arrival (AOA) in conjunction with remote tags and a locator. The locator's antenna is tethered to a central point, and moved in a constrained motion so that it describes a roughly circular horizontal path. The locator transmits and receives sets of complex radio sequences to/from the tag(s) so that the tag(s) emit signals which are phase, chip, and symbol coherent with the received locator signals. This enables the locator to determine the distances and Doppler shifts between itself and the tag(s) at various positions in its path such that, by post correlation processing of complex captured signal sequences, aims a virtual phased array antenna at the tag(s), resulting in enhanced distance and direction measurements. The angular position of the orbiting locator's antenna may be measured using an electronic compass packaged with the antenna.

Abstract: For a set-up for measuring a rotational speed of a turbocharger of a motor vehicle, including at least one antenna for generating and/or receiving electromagnetic radiation and an electronic module having at least one electric and/or electronic component and being electrically connected to the antenna. The set-up further includes a housing shell made at least partially of laser-absorbing material and having an inner chamber, and a housing cover, which rests on at least one laser-absorbing contact surface of the housing shell and covers the inner chamber of the housing shell at least partially, and at least sections of which are made of material transparent to laser radiation; the antenna and the electronic module being situated in the inner chamber of the housing shell, and at least sections of the housing cover being welded to the housing shell at the at least one contact surface using a laser-welded seam.

Abstract: A radar sensor system and method for ascertaining whether an unattended child is present within an automotive vehicle. The radar sensor system carries out the method and includes a transmitter, at least one sensor, and processing circuitry. The method includes the steps of: illuminating at least one occupiable position within the vehicle with radiation of multiple frequencies; generating radar sensor signals from reflections of the transmitted radiation, a plurality of the radar sensor signals corresponding to different frequencies; and operating the processing circuitry for generating and determining if a first indicator value indicative of motion in the occupiable position satisfies a first predetermined criteria and, if so, generating and determining a second indicator value indicating a degree of repetitive pattern within the radar sensor signals, and determining presence of an unattended child in the vehicle if the second indicator value satisfies a second predetermined criteria.

Abstract: A radar apparatus (5) for detecting multipath signal propagation when determining an elevation angle of an object, comprising an antenna array with which the radar apparatus is arranged to form at least three separate antenna beams (11, 12, 13) comprising a first antenna beam (11) having an angle of elevation above horizontal, and a separate second antenna beam (12) having an angle of elevation at or above horizontal which is less than that of the first antenna beam, and a separate third antenna beam (13) having an angle of elevation below horizontal. The apparatus is arranged to transmit radio pulses from the antenna array; to receive return radio signals within the first, second and third antenna beams; to calculate a measure of the magnitude of a return radio signal received within the third antenna beam using all of said received radio signals collectively; and, to detect multipath signal propagation using said measure.

Abstract: The radiation-direction changing and maintaining portion includes: a linear-movement generator, which is provided on a surface of a wave energy radiating portion opposite to a surface of the wave energy radiating portion from which the wave energy is radiated, and is configured to generate power required to change the direction of radiation of the wave energy radiating portion linearly along the wave energy radiating portion; a direction changer, which is provided so as to face the linear-movement generator, and is configured to change a direction of the power generated by the linear-movement generator toward the wave energy radiating portion to turn the wave energy radiating portion; and a force applying member configured to apply a force to the wave energy radiating portion in a direction against the turning of the wave energy radiating portion, which is caused by the power.

Abstract: A system includes a plurality of satellites including respective antennas and circuitry. The satellites form a satellite constellation and revolve around a rotating astronomical object from which a source radiates interference toward a target satellite for at least some period of time as the target satellite revolves in a target orbit. The satellites' respective antennas may capture the interference when the satellite constellation is substantially in-line between the source and target satellite, and their circuitry may generate respective measurements based thereon. The circuitry may geolocate or cause transmission of the respective measurements for geolocation of the source based on the respective measurements to thereby identify a location of the source on the astronomical object.

Abstract: A method for finding a position of an object using a MIMO FMCW radar. A ramp-shaped frequency-modulated radar signal is transmitted as a sequence of time-delayed successive ramps. A switch network is controlled to provide a corresponding switching state for each of the successive ramps. A different selection of antenna elements is used for transmission of each respective ramp. Radar echoes reflected by radar targets are mixed with the transmitted signal and are down-converted. Baseband signals resulting therefrom are transformed into spectra. Each baseband signal is separately subjected to a two-dimensional Fourier transform. A window function is applied to each of the baseband signals prior to the transform being carried out over a ramp index in a second dimension. A different window function is applied for each of the switching states. The spectra are subjected to a frequency-dependent phase correction which compensates for time offsets of the ramps.

Abstract: A method and system for detecting a floating layer on a surveillance area of the sea surface, a site of interest being placed in or around the surveillance area. The method comprises the following steps: a) satellite measurement of a radar feedback return, the radar signal being emitted by a satellite toward the sea surface of the surveillance area; b) recognition of at least one swell profile of the sea surface in accordance with the satellite measurements; c) identification of the fluid properties corresponding to the recognized swell profiles; and d) emission of a warning when the fluid properties identified for one of the recognized profiles correspond to a sea surface that includes undesirable elements for the site of interest.

Abstract: A radar system having side lobe blanking capability is disclosed. The system can include a single channel antenna and receiver system, the side lobe blanking system being time multiplexed, but requiring no dedicated guard channel data collection period such that the scan rate of the system is not degraded.

Abstract: A feed network for a multi-beam antenna is provided, including a first beam port, a second beam port, a beam-forming network coupled to the beam ports, and a cancellation circuit. The cancellation circuit is coupled to the first beam port and the second beam port before the beam-forming network. The cancellation circuit extracts a portion of a RF signal on the first beam port, adds phase delay, and injects the extracted, delayed signal from the first beam port onto the second beam port, and extracts a portion of a RF signal on the second beam port, adds phase shift, and injects the extracted, delayed signal from the second beam port onto the first beam port. In one example of the invention, the cancellation circuit comprises a first directional coupler on a first beam input path, a transmission line, a second directional coupler on the second beam input path.

Abstract: A system for providing remote target identification is provided that includes a radar system and an electro-optical detector. The radar system is configured to locate a remote target. The electro-optical detector is configured to detect an optical signal transmitted from the target when the target is located. The optical signal includes identifying data for the target.

Abstract: System and method for determining range to targets using an M-of-N range resolver includes transmitting multiple coherent processing interval (CPI) signals with different pulse repetition frequencies (PRFs) towards the targets, receiving and storing threshold hits from prior N?1 CPIs; converting the threshold hits from the current CPI and prior N?1 CPIs to range unfolded threshold hits; generating a lookup table of the plurality of range unfolded threshold hits from the prior N?1 CPIs; determining the number of the prior N?1 CPIs in which a range unfolded threshold hit from the current CPI has at least one range coincident range unfolded threshold hit from a prior CPI utilizing the lookup table; generating a range resolved threshold hit when the number is greater than or equal to M?1; accumulating range resolved threshold hits; and determining the range to the targets.

Abstract: A surveillance apparatus for determining a position of an object in a field of view, comprising a radar sensor having at least on transmitting antenna configured to transmit electromagnetic radiation and a plurality of receiving antennas configured to receive electromagnetic radiation, wherein the receiving antennas form a virtual antenna array, and a processing unit connected to the radar sensor to receive signals from the receiving antennas corresponding to the received electromagnetic radiation, wherein the processing unit is configured to determine a correlation matrix on the basis of the received signals, and wherein the processing unit is configured to determine a direction of a position of the object in the field of view with respect to the radar sensor on the basis of the correlation matrix for a defined distance of the object from the radar sensor.

Abstract: A multistatic array topology and image reconstruction process for fast 3D near field microwave imaging are presented. Together, the techniques allow for hardware efficient realization of an electrically large aperture and video-rate image reconstruction. The array topology samples the scene on a regular grid of phase centers, using a tiling of multistatic arrays. Following a multistatic-to-monostatic correction, the sampled data can then be processed with the well-known and highly efficient monostatic Fast Fourier Transform (FFT) imaging algorithm. In this work, the approach is described and validated experimentally with the formation of high quality microwave images. The scheme is more than two orders of magnitude more computationally efficient than the backprojection method. In fact, it is so efficient that a cluster of four commercial off-the-shelf (COTS) graphical processing units (GPUs) can render a 3D image of a human-sized scene in 0.048-0.101 seconds.

Abstract: Some embodiments of the present invention derive an ionospheric phase bias and an ionospheric differential code bias (DCB) using an absolute ionosphere model, which can be estimated from data obtained from a network of reference stations or obtained from an external source such as WAAS, GAIM, IONEX or other. Fully synthetic reference station data is generated using the ionospheric phase bias and/or the differential code bias together with the phase leveled clock and ionospheric-free code bias and/or MW bias.

Abstract: Systems and methods are disclosed for improving the speed and accuracy of terrestrial tracking with more than one receiver. Furthermore, terrestrial tracking of more than one receiver can be improved in areas where terrestrial tracking has been difficult to accomplish with acceptable accuracy, such as in rural areas where buildings can reflect satellite, and other, signals. For example, fast and precise position estimation in a short delay multipath environment can be solved by simultaneously estimating the position of multiple receivers using receiver to receiver distance ranges.

Abstract: Systems and methods for aligning a satellite antenna mounted on a mobile platform to the platform are disclosed. At each of several arbitrary orientations, a first directional vector is determined from the antenna to a satellite. For each orientation, an alias transformation is performed to transform the first vector having coordinates defined with respect to a first reference frame to a second vector having coordinates defined with respect to a second reference frame. A third vector is determined based on the orientation of the antenna after peaking the antenna. A rotation matrix is derived from the collection of second and third vectors. An estimate of the rotational offset of the satellite antenna with respect to the platform is determined based on the rotation matrix. The rotational offset is applied to the attitude of the platform to accurately point the antenna to the satellite.