Abstract: A method of kinematic ranging for finding the range R of a jammer moving on a trajectory involves measuring the bearing of the jammer and the rate of change thereof using an airborne detector radar at a first position (24), causing the airborne detector radar to carry out a manoeuvre such that is it displaced in the horizontal plane by a displacement having orthogonal components ?x, ?y, and measuring the bearing of the jammer at a second position subsequent to the manoeuvre. By making an appropriate choice for the components ?x, ?y, the range R may be found with a desired relative range accuracy, and the error in R may be minimized.

Abstract: A radar system suitable for an automated vehicle includes a plurality of antennas configured to detect a reflected radar signal reflected by an object in a field-of-view of the system. Each antenna of the plurality of antennas is configured to output detected signals indicative of the reflected radar signal detected by each of the plurality of antennas. The system also includes a controller configured to receive the detected signals from the plurality of antennas, determine if the object is present in the field-of-view based on the detected signals, and determine a phase-difference between symmetrical-frequency-bins for each antenna. The symmetrical-frequency-bins are symmetrically offset from a maximum-amplitude non-coherent-integration detection-frequency-bin (max-NCI-bin). The controller is further configured to determine a classification of the object based on a time-domain-analysis of the phase differences across the plurality of antennas.

Abstract: A radar signal processing apparatus is disclosed which includes: time-series phase data generating section 3 generating time-series phase data in a range bin of interest based on a range profile indicating, for each range bin, a phase of a reflected wave of a radio wave from a target; phase-rotation-amount time-series data generating section 4 that divides the time-series phase data into segments of a predetermined time length, calculates an amount of phase rotation that occurs in the segments, and generates time-series data on the amount of phase rotation; pattern matching section 6 that performs pattern matching between the generated time-series data on the amount of phase rotation and a template of time-series data on the amount of phase rotation that is defined by a distance and a moving speed; and speed detection section 7 that detects the moving speed of the target based on a result of the pattern matching.

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: A multi-static radar system for monitoring water surface targets is provided. The multi-static radar system may include a first and second radar, a state machine, and a signal processor. The radars may be located in separate locations and synchronized using timing signals. The state machine may be configured to determine, using the timing signals, start times and end times of radio frequency signal modulations for each radar. A concept of negative pseudo-range is provided, whereby the modulation start times are configured to allow pseudo-negative time delays at as many as half of the radar receivers, thereby doubling the multi-static echo detections. The signal processor may be configured to simultaneously receive and process the echoes of the radar signals received at the radars to determine position and velocity vectors for the monitored water surface targets.

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 blade mounted radar system comprises a wind turbine having a hub and blades extending therefrom; a radar antenna configured to transmit and/or receive a radio frequency (RF) signal; and a processor in electrical communication with the radar antenna and configured to generate the RF signal for transmission and/or to process the received RF signal. The radar antenna is affixed to one of the blades of the wind turbine such that relative motion is defined between the radar antenna and a target within a line of sight of the radar antenna. The problem of the ground based radar line of sight being obscured by the wind turbine is mitigated in this setup, as radar and turbine coexist in the same structure. Improved performance and additional capability are enabled by elevated installation and vertical SAR imaging capability. Doppler capabilities are extended using known motion of the antenna relative to stationary objects.

Abstract: A radar system according to the present disclosure includes a transmit antenna, a receive antenna composed of at least three receive antenna elements, a transmitter, a receiver that generates at least three first received signals by demodulating a plurality of reflected waves received by each of the receive antenna elements, a prefilter that estimates a plurality of main arrival angles representing directions of the targets using the at least three first received signals, a direction canceler that generates at least two first extracted signals by using the at least three first received signals to form nulls in eliminating arrival angles which are all the main arrival angles except an extracting arrival angle, and an image generator that analyzes Doppler frequency components around the extracting arrival angle using the at least two first extracted signals and calculates scattering-center arrival angles which each represent the arrival angle for each Doppler frequency component analyzed.

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: In an example method, a vehicle configured to operate in an autonomous mode could have a radar system used to aid in vehicle guidance. The method could include a plurality of antennas configured to transmit and receive electromagnetic signals. The method may also include a one or more sensors configured to measure a movement of the vehicle. A portion of the method may be performed by a processor configured to: i) determine adjustments based on the movement of the vehicle; ii) calculate distance and direction information for received electromagnetic signals; and iii) recover distance and direction information for received electromagnetic signals with the adjustments applied. The processor may be further configured to adjust the movement of the autonomous vehicle based on the distance and direction information with adjustments applied.

Abstract: In order to determine the topology of a bulk-material surface, a series of echo curves are measured under different main emission directions of the antenna. The main emission directions are generated using at least one prism, which lies in the beam path of the level indicator and is rotated. It is thereby possible to achieve in a compact design the decoupling of beam generation from mechanical deflection of the main emission direction.

Abstract: The SAR Point Cloud Generation System processes synthetic aperture radar (SAR) data acquired from multiple spatially separated SAR apertures in such a manner as to be able to calculate accurate three-dimensional positions of all of the scatterers within the imaged scene. No spatial averaging is applied thus preserving the high resolution of the original SAR data, and no phase unwrapping processes are required. The effects of height ambiguities are significantly reduced in the SAR Point Cloud Generation System. The SAR Point Cloud Generation System also self-filters against mixed-height pixels that can lead to incorrect height estimates. The system estimates scatterer height by a maximization of an Interferometric Response Function.

Abstract: A phased-array receiver comprises a plurality of analog beamforming receive channels, each comprising an antenna element arranged to receive a radio frequency signal and a channel output arranged to provide an analog channel output signal. At least one of the plurality of analog beamforming receive channels comprises an in-phase downconversion mixing circuit connected to the antenna element and a local oscillator source and arranged to provide a downconverted in-phase signal to a phase rotation circuit, and a quadrature downconversion mixing circuit connected to the antenna element and the local oscillator source and arranged to provide a downconverted quadrature signal to the phase rotation circuit. The phase rotation circuit is arranged to provide to the channel output a phase-shifted analog output signal generated from the downconverted in-phase signal and the downconverted quadrature signal.

Abstract: A radar apparatus to detect an object includes a detecting unit configured to detect the object based on a reflected wave received in response to transmitting a transmission wave, in order to output a detection result of the object, a storage unit including a first storage part to store the detection result, and a second storage part to store a copy of information stored in the first storage part based on a copy command, and a selecting unit configured to select one of the first storage part and the second storage part as an access destination, in order to output the detection result stored in one of the first storage part and the second storage part selected as the access destination.

Abstract: A radiation absorber comprising multiple layers has a conducting base layer, and at least first and second further layers, each separated by a dielectric material, the first and second layers having patches thereon of highly conducting material, and defining resonant cavities in cooperation with the dielectric material, wherein the resonant cavities formed on adjacent layers differ in frequency. Characteristics of the patch, such as size or shape may vary on each layer to provide different resonant frequencies, and/or dielectric or magnetic properties of the dielectric material, and/or separation distance of the patches may be varied. In some embodiments, complex dielectrics may have their loss factors adapted to tune a resonant frequency, or to adapt its resonant bandwidth.

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 transmission signal generating unit generates a transmission signal by multiplying one (selected in prescribed order) of 2N+1 (N: an integer of 1 or more) codes of a Spano code sequence by one code (selected in prescribed order), having a length 1, of one of a first code or a second code each having a code length 2N+1 in every transmission cycle. A transmission RF unit converts the transmission signal into a radio-frequency radar transmission signal and transmits it from a transmission antenna. As for codes used in adjacent two transmission cycles for two times 2N+1 transmission cycles, the sum total of inner products of codes having a length 1 of the first code, inner products of codes having a length 1 of the second code, and inner products of codes of the first code and the second code becomes equal to 0.

Abstract: A collision determination device includes: a radar detection unit that detects an object in front of a vehicle using a radar wave; an image detection unit that captures an image in front of the vehicle and detects the object using the captured image; and a collision determination unit that determines a collision between the vehicle and the object based on a composite target which is generated using a detection result of the radar detection unit and a detection result of the image detection unit. The collision determination unit performs collision determination on the basis of the detection result of the image detection unit, instead of the collision determination based on the composite target, when it is determined that the object cannot be detected by the radar detection unit and can be detected by the image detection unit and the object is stationary in a traveling direction of the vehicle.

Abstract: A level measuring device with an integratable lens has a radar level meter and an angle adjusting assembly. The radar level meter has a horn antenna and a lens antenna assembly mounted on a signal transceiving end of the radar level meter. The lens antenna assembly has a housing and a lens antenna. The housing is hollow and receives the horn antenna therein. One end of the housing is connected to the lens antenna, and the other end of the housing is connected to the signal transceiving end of the radar level meter. The angle adjustment assembly is mounted around the housing. As the lens antenna assembly covers the horn antenna, the horn antenna is less likely to be damaged. Additionally, the housing of the lens antenna assembly is connected with the angle adjusting assembly for angle adjustment of the combined horn antenna and lens antenna assembly.

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.