Abstract: The described disclosure presents embodiments of an efficient shortwave radio technique using a network of multiple sites located in and around an operating region (e.g., continental USA), calibrated distributed beacons, a detailed knowledge of ionospheric behavior, and sophisticated operational tools and software, that geo-locates targets without depending on satellites. The embodiments of the technique described herein, for example, accurately may locate a target by utilizing remote field units, a network of radio receive sites, receivers that accept and time stamp pertinent signals, demodulators that recognize and extract meaningful data from received signals, communications from all receive sites to a Network Operations Center (NOC), communications from NOC to field units to keep shortwave channel choices relevant and effective, and a processor within the NOC that analyzes and evaluates data.

Abstract: The invention relates to a portable electronic signal generator, and in particular a programmable multi-waveform radiofrequency generator for use as battlefield decoy.

Abstract: A distributed aperture bi-static radar system, apparatus, architecture, and method is provided for coherently combining physically distributed radars to jointly produce target scene information in a coherent fashion by alternately selecting first and second small aperture devices to operate as the master unit so that radar signals are sequentially transmitted from every transmit antenna in the first and second small aperture devices, thereby enabling the radar control processing unit to coherently combine mono-static and bi-static virtual array apertures from the first and second small aperture radar devices to construct an extended bi-static MIMO virtual army aperture that is larger than the bi-static MIMO virtual array apertures produced by the first and second small aperture radar devices.

Abstract: In at least one illustrative embodiment, a guided wave radar (GWR) level transmitter may comprise a timing circuit including a first oscillator circuit and a second oscillator circuit, a coincidence circuit configured to generate a coincidence signal indicative of phase shifts created by a difference between first and second frequencies of the first and second oscillator circuits, and a microcontroller configured to (i) determine a stretching factor based on the coincidence signal and at least one of the oscillator signals, (ii) calculate, when the stretching factor is within a first range, a distance to a media surface using the stretching factor, and (iii) adjust, when the stretching factor is outside of a second range, at least one of the first and second oscillator circuits to adjust the difference between the first and second frequencies.

Abstract: Embodiments provide for a portable imager by capturing several radar readings related to an object in an environment over several times from several of Points of View (POV), wherein each radar reading indicates a distance to and reflectivity of the object relative to the imager; capturing several camera images of the environment over the several of times from the several POVs; determining positional shifts of the imager over the several times based on photogrammetrical differences between subsequent camera images of the several camera images; determining, based on accelerometer data, a trajectory that the imager moves in the environment over the several times; determining positions of the imager in the environment over the several times based on the positional shifts and the trajectory; combining the several radar readings based on the positions to produce a synthetic aperture radar image of the object; and outputting the synthetic aperture radar image.

Abstract: The disclosed systems, structures, and methods are directed to an object detection system, employing a receiver configured to receive a signal reflected from an object, an analog-to-digital converter (ADC) configured to convert the received signal into a digital signal, a pre-processor configured to improve a signal-to-noise (SNR) of the digital signal and to generate a pre-processed signal corresponding to the digital signal, a parameter extractor configured to calculate a number of reference cells M and a multiplication factor K0, and a Constant False Alarm Rate (CFAR) processor configured to analyze a cell-under-test (CUT) and M reference cells in accordance with the number of reference cells M and the multiplication factor K0 to detect the presence of the object.

Abstract: A radar apparatus includes: a detection portion that transmits a radio wave to a target and receives a radio wave reflected on the target so as to detect instantaneous data; and an allocation portion that allocates the instantaneous data to prediction data of the target so as to take continuity of the target; and the allocation portion corrects velocity of the instantaneous data and velocity of the prediction data respectively as velocities made in line with a predetermined direction set as a reference, so as to allocate the instantaneous data to the prediction data based on at least magnitudes of the respectively corrected velocities.

Abstract: A fastening assembly for a radar level-measuring device with an antenna with a main emission direction, comprising a microwave window for the spatial and thermal separation and microwave connection of a first space and a second space with a plate-shaped, disk-shaped barrier at least partially permeable to microwaves, wherein a surface of the barrier oriented towards the antenna includes an angle unequal to 90° with the main emission direction.

Abstract: An avian detection system for determining risks of collision between a collision object and bird objects includes avian radar system(s) providing a first type of information data relating to objects detected, and a transponder receiver receiving transponder data transmitted or broadcasted by transponders provided at the collision objects. Processors are configured to receive first type of information data corresponding to the detected objects and provide radar plots. The processors are further configured to receive the transponder data and provide transponder plots, to create and store a number of object tracks based on the provided radar plots and transponder plots, with each track holding object data corresponding to or determined from data of matching plots, and to determine one or more risks of collision or collision risk levels for the collision object based on object data of a plurality of the obtained object tracks.

Abstract: Embodiments are provided for a radar system including: an N number of transmit antennas; a chirp generator configured to produce linear chirp waveforms; an N number of phase shift keying (PSK) coders, each assigned a respective optimized transmitter code of a set of optimized transmitter codes, each optimized transmitter code of the set comprises a sequence of K code chips, each optimized transmitter code of the set is orthogonal to every other optimized transmitter code of the set, spectral analysis of a cross-correlation between any two optimized transmitter codes results in sidelobes no greater than a predetermined detection threshold, each PSK coder encodes K linear chirp waveforms according to the sequence of K code chips of the respective optimized transmitter code and produces a respective optimized coded chirp sequence, and each of the N transmit antennas outputs the respective optimized coded chirp sequence at the same time.

Abstract: The invention relates to a frequency converter circuit for a radar-based distance-measuring device. The core of the frequency converter circuit is a non-linear, high-frequency component, having a frequency connection point and a signal connection point, which serves as a signal input for a low-frequency input signal. On the reception side, the frequency converter circuit comprises at least one receiving antenna for receiving the high-frequency reception signal and a non-linear semiconductor component for downconverting the high-frequency reception signal. The frequency converter circuit therefore uses the effect that, by means of the low-frequency input signal, corresponding harmonic waves are induced at the non-linear, high-frequency component. Furthermore, the high-frequency reception signal is downconverted into a low-frequency evaluation signal, whereby the further determination of the distance can be performed on the basis of the low-frequency evaluation signal, which can be processed more easily.

Abstract: The present invention is enclosed in the area of wireless communication systems, generally towards the problem of multipath interference, and specifically towards mitigating the effect of standing wave in indoor positioning systems. The present invention includes a standing wave cancellation wireless transmitter configured to, for each signal with wavelength ? to be transmitted, transmit a first wave with wavelength ? and a second wave with wavelength ? and a shift equal to half the wavelength ?. It is also part of present invention a standing wave cancellation wireless receiver configured to perform the average of a first wave with wavelength ? and a second wave with wavelength ? and a shift equal to half the wavelength ?, creating a single received signal and a system comprising at least one of said wireless transmitters and at least one of said wireless receivers and a method implemented by the said transmitter and receiver.

Abstract: A target detection and/or high resolution RF system is provided herein in which the resolution of a legacy target angle detection (direction of arrival) system is improved without any change to the existing hardware of the legacy target detection system. Rather, the target detection and/or high resolution RF system can apply virtual aperture postprocessing to reflected signals to achieve improvements in the detection of one or more targets.

Abstract: A system for phase-modulated radar detection, preferably including one or more transmitter arrays, receiver arrays, and signal processors. A method for phase-modulated radar detection, preferably including transmitting a set of probe signals, receiving a set of reflected probe signals, and/or decoding the set of received probe signals, and optionally including evaluating effects of phase variance and/or modifying probe signal characteristics.

Abstract: Systems and methods for touchless operation of mechanical input devices are disclosed. In embodiments, a control system includes a mechanical input device, a RADAR sensor, and a controller in communication with the mechanical input device and the RADAR sensor. The RADAR sensor is in proximity to the mechanical input device and configured to track user hand and finger movements. The controller is configured to detect a gesture indicating a user action corresponding to a manipulation of the mechanical input device based on the user hand and finger movements tracked by the RADAR sensor. The controller is further configured to generate a control signal based upon the user action.

Abstract: A radar fill level measurement device for fill level measurement or for recording a topology of a filling material surface in a container is provided, including: a circuit board including a first radar chip on a first circuit board surface and a second radar chip on a second circuit board surface, the first chip and the second chip each including one or more transmission channels configured to generate a transmission signal, and one or more reception channels configured to receive the transmission signal reflected at the filling material surface, at least one of the transmission channels of the first chip being connected, via a first line, to an antenna assembly for radiating the transmission signal, and at least one of the reception channels of the second adar chip being connected, via a second line, to the antenna assembly for receiving the reflected transmission signal.

Abstract: A method is described that, according to one exemplary embodiment, involves the following: generating a first radio frequency (RF) signal by a first RF oscillator and a second RF signal by a second RF oscillator, mixing the first RF signal and the second RF signal by a mixer to generate a mixer output signal, digitizing the mixer output signal to generate a digitized signal, and calculating an estimate for a power spectral density of the mixer output signal from the digitized signal. Based on the estimate for the power spectral density of the mixer output signal, an estimate for a noise power spectral density characterizing the noise contained in the first and the second RF signals is calculated.

Abstract: Systems and method are provided for three-dimensional (3D) imaging by using Doppler and interferometric processing techniques for general planar phased arrays. Systems and methods according to embodiments of the present disclosure incorporate motion compensation techniques in a way that utilizes the full aperture of a phase array. Embodiments of the present disclosure can be applied to a variety of different radar imaging modalities, including X-band and millimeter wave (MMW) regimes.

Abstract: The system is configured to generate a display of a tagging interface. The tagging interface may include a stitching selector. In response to a user selection of (1) a destination element that includes a first name identifier, (2) a source element that includes at least one of the plurality of pixels such that at least one of the plurality of pixels corresponding to longitude-time points comprising a second name identifier, and (3) the stitching selector, the system can be configured to indicate that the source element comprises the first name identifier.

Abstract: A radar level measurement device for level measurement or for determining a topology of a filling material surface in a container is provided, including a first radar chip and a second radar chip, the first radar chip including a first synchronisation circuit configured to generate a radio-frequency signal, and the second radar chip including a second synchronisation circuit; and a radio-frequency line assembly configured to transmit the radio-frequency signal from the first synchronisation circuit to the second synchronisation circuit to synchronise the first and the second radar chips, the radio-frequency line assembly including two or more different line types arranged in series with one another.